Protective device for high-speed rail precast beam support pad stone grouting construction

Abstract

The utility model belongs to the technical field of bridge construction, and particularly relates to a protective device for high-speed rail precast beam support cushion stone grouting, which comprises a hoisting mechanism, a suspension mechanism and a storage rack which are mounted on a bridge girder erection machine, the rotary hanging basket comprises a crawling ladder, a protective ring installed on the crawling ladder and a sliding platform allowing people to stand, and the sliding platform is assembled on the crawling ladder in the mode that the position in the vertical direction can be adjusted. The rotary hanging basket is movably assembled on the hanging mechanism so as to be close to a wet joint between the two adjacent precast beams, and the crawling ladder can partially pass through the wet joint; the hoisting mechanism is arranged above the storage rack and used for hoisting the rotary hanging basket to the position above the precast beam and hanging the rotary hanging basket on the storage rack, and the storage rack is used for supporting the rotary hanging basket. The rotary hanging basket can adapt to grouting construction of precast beam support cushion stones with different heights, the rotary hanging basket does not need to be replaced frequently, and the rotary hanging basket can be applied to different working conditions and is better in universality and higher in safety.

Description

TECHNICAL FIELD

[0001] The utility model belongs to bridge construction technical field, concretely relates to a kind of protection device for high-speed rail prefabricated beam support padstone grouting. BACKGROUND

[0002] In the process of high-speed rail bridge construction, the prefabricated beam is usually erected on the corresponding pier by bridge erecting machine, and the installation of box girder support anchor bolt rod, the measurement of support elevation and support grouting are needed during the process of bridge erecting machine beam placement, which requires the operator to operate on the pier top of the beam to be erected.

[0003] The operator can reach the pier top by the following ways:

[0004] 1. When the pier is low, the operator can reach the top of the box girder pier to be erected by ground ladder, but this method is difficult to implement when the pier is high, because the height of the ladder needs to be increased, which increases the safety risk of the construction personnel when setting up a high ladder on the ground;

[0005] 2. When the pier is high, a ladder is set up at the end of the erected prefabricated beam, and the operator reaches the top of the pier by the ladder before the prefabricated beam to be erected is lifted above the pier, then the ladder needs to be removed to avoid affecting the beam placement of the prefabricated beam to be erected. The installation, disassembly and anchoring of the ladder at the beam end all rely on manual labor, and the cycle operation needs to be performed for each prefabricated beam. When the operator performs support grouting on the pier top, sometimes there is no protective platform around the pier, and the operator uses the ladder to go down from the beam surface to the pier to be erected and performs support grouting operation, which lacks protective measures, and when checking the support grouting quality on the outside of the pier, there is no fence protection on the pier, and the safety rope has no hanging point, which is low in safety.

[0006] After the operator completes the support grouting by the above two methods, the operator needs to enter the box girder through the manhole at the tail of the erected prefabricated beam, walk to the front pier, and reach the beam surface of the erected prefabricated beam by placing a ladder between the front pier top and the erected prefabricated beam or by standing on the ladder attached to the bridge erecting machine leg accessory on the front pier top. This method is not conducive to personnel operation. UTILITY MODEL CONTENTS

[0007] The utility model aims to provide a protective device for high-speed rail prefabricated beam support padstone grouting construction, to solve the technical problem that the personnel return process from the beam surface to the pier top and the poor protection when the personnel check the grouting quality on the pier top in the prior art, which is prone to safety risks.

[0008] To solve the above problems, the protective device for high-speed rail prefabricated beam support padstone grouting construction provided by the utility model adopts the following technical scheme:

[0009] The protective device for the grouting construction of the high-speed railway prefabricated beam support cushion stone comprises a hoisting mechanism for being installed on a bridge erecting machine, a suspension mechanism and a storage rack, a rotating hanging basket is detachably connected to the suspension mechanism, the rotating hanging basket comprises a ladder, a guard ring installed on the ladder and a sliding platform for personnel to stand, the sliding platform is adjustably assembled on the ladder in the up-down direction, the rotating hanging basket is movably assembled on the suspension mechanism to approach the wet joint between two adjacent prefabricated beams, the ladder can partially pass through the wet joint, the hoisting mechanism is arranged above the storage rack and is used for hoisting the rotating hanging basket above the prefabricated beam and connecting the rotating hanging basket to the storage rack, and the storage rack is used for supporting the rotating hanging basket.

[0010] The utility model discloses the beneficial effect is: adopt the utility model to carry out construction before, can according to the height of different prefabricated beam, adjust the installation position of sliding platform, make it with the height matching of pier top, adjust the rotating hanging basket to be the position of following bridge direction, and personnel pass through the ladder to reach the sliding platform of rotating hanging basket from the beam surface of already erected prefabricated beam, then adjust the rotating hanging basket to approach the pier, and personnel can reach the pier top through the sliding platform, after finishing the pier top support grouting etc. operation, adjust the position of rotating hanging basket relative to suspension mechanism, make rotating hanging basket move to the wet joint between two adjacent prefabricated beams, and make the ladder pass through the wet joint and approach the pier top, at this moment, the construction personnel can enter the sliding platform, adjust the rotating hanging basket and make it move out of the wet joint relative to the suspension mechanism, after reaching the side surface of prefabricated beam, personnel reach the beam surface of already erected prefabricated beam through the ladder. The guard ring guarantees the safety of construction personnel during the ladder operation. When a piece of beam is erected, adjust the rotating hanging basket to be the position of horizontal bridge direction, do not affect the hole span of bridge erecting machine and carry out the erection of the next piece of beam. When the beam erection operation of whole bridge is completed, when the bridge erecting machine encounters the interference condition of rotating hanging basket and other structures during short distance climbing, can remove the rotating hanging basket from the suspension mechanism in advance, and place the rotating hanging basket on the storage rack through the hoisting mechanism, when the normal hole span erection is restored, then lower the rotating hanging basket to the construction position and connect with the suspension mechanism. The utility model can adapt to the grouting construction of different height prefabricated beam support cushion stone, and the rotating hanging basket does not need to be frequently replaced, can be applied in different working conditions, and the universality is better, and the safety operation requirement of construction personnel can be met.

[0011] Further, the suspension mechanism comprises a cantilever frame and a driving device movably assembled on the cantilever frame, a slewing structure capable of rotating in the horizontal direction is arranged on the driving device, and the top of the ladder is detachably connected with the slewing structure.

[0012] Further, the driving device is a hand-pulled trolley, the cantilever frame has a track for the wheels of the hand-pulled trolley to walk on, and a hand-pulled chain of the hand-pulled trolley is opposite to the sliding platform; the hand-pulled trolley is externally provided with a protective frame, the rotating structure comprises a bearing seat plate fixed at the bottom of the protective frame, a bearing installed on the bearing seat plate, and a threaded pin shaft installed on the bearing, the top of the ladder is connected with a mounting frame, and the threaded pin shaft penetrates through the mounting frame and is threadedly connected with lock nuts on the upper and lower sides of the mounting frame.

[0013] Beneficial effects: the construction personnel can adjust the position of the whole rotating basket by pulling the hand-pulled chain while standing on the sliding platform, which is convenient to operate; in addition, the connection between the ladder and the hand-pulled trolley is realized in the form of a threaded pin shaft and lock nuts, which facilitates the installation and disassembly of the ladder while realizing the rotation of the ladder.

[0014] Further, the installation angle of the cantilever frame in the horizontal direction is adjustable.

[0015] Beneficial effects: the cantilever frame can drive the rotating basket to adjust the installation angle, so that the rotating basket can be closer to the pier, which is safer for the construction personnel to move from the sliding platform to the top of the pier, and is also conducive to the accurate alignment of the hoisting mechanism and the rotating basket.

[0016] Further, the guard ring is spaced apart in the up-down direction.

[0017] Preferably, the guard ring is adjustably assembled on the ladder in the up-down direction.

[0018] Beneficial effects: when dealing with precast beams of different heights, the installation height of the guard ring can be adjusted to match, thereby ensuring the safety of the construction personnel and improving the application range of the rotating basket.

[0019] Further, the sliding platform comprises a base, a sliding seat and a guardrail, the sliding seat is connected perpendicularly to the base, the sliding seat is in sliding cooperation with the ladder, and a locking structure is arranged between the sliding seat and the ladder; the guardrail is arranged around the base, and the guardrail comprises a fence opposite to the ladder and capable of being opened and closed.

[0020] Beneficial effects: in combination with the guard ring, the personal safety of the construction personnel can be ensured in all directions.

[0021] Further, the hoisting mechanism comprises a lifting frame and a hoisting mechanism installed on the lifting frame, the hoisting mechanism is a hand-operated structure, comprising a hand-operated winch, a steel wire rope wound on the hand-operated winch, and a hook connected to the end of the steel wire rope, the hook is used for hooking the ladder, and the lifting frame is provided with a guide wheel for the steel wire rope to pass through and guide the steel wire rope.

[0022] Beneficial effects: the hoisting mechanism has a simple structure and is convenient to operate.

[0023] Preferably, the horizontal installation angle of the hanger is adjustable.

[0024] Beneficial effects: The hanger can rotate horizontally, and the position of the hook can be adjusted accordingly, ensuring that the hook can accurately hook onto the ladder when lowered.

[0025] Furthermore, the storage rack includes two parallel cantilever support beams spaced apart, with a limiting stop for limiting the ladder connected to the end of the cantilever support beam away from the bridge erecting machine.

[0026] Beneficial effect: When the ladder is hoisted to the storage rack, the limit stop can stop and limit the ladder, preventing it from sliding off the cantilever support beam. Attached Figure Description

[0027] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0028] Figure 1 This is a front view of the protective device for grouting the bearing pad of the precast beam of high-speed railway during use.

[0029] Figure 2 This is a side view of the protective device for grouting the bearing pad of the precast beam of high-speed railway during use.

[0030] Figure 3 This is a top view of the protective device for grouting the bearing pad of the precast beam of high-speed railway during use.

[0031] Figure 4 for Figure 1 Schematic diagram of the central suspension mechanism;

[0032] Figure 5 for Figure 4 Structural view of the cantilever frame;

[0033] Figure 6 for Figure 4 Side view of the installation of the hand-pulled trolley;

[0034] Figure 7 for Figure 1 Front view of the rotating hanging basket;

[0035] Figure 8 for Figure 1 Side view of the rotating hanging basket;

[0036] Figure 9 for Figure 7Front view of the sliding platform;

[0037] Figure 10 For Figure 7 Side view of the sliding platform;

[0038] Figure 11 For the connection details of the suspension mechanism and the rotating hanging basket;

[0039] Figure 12 For Figure 1 Structure diagram of the hoisting mechanism;

[0040] Figure 13 For Figure 1 Structure diagram of the storage rack.

[0041] Explanation of reference signs:

[0042] 1, bridge girder erection machine; 2, precast beam; 3, rotating hanging basket; 31, ladder; 311, hoisting lug plate; 312, mounting rack; 313, unloading buckle; 32, first guard ring; 33, second guard ring; 34, sliding platform; 341, base; 342, sliding seat; 343, first column body; 344, second column body; 345, third column body; 4, hoisting mechanism; 41, hand winch; 42, hanging bracket; 43, hook; 44, guide wheel; 5, suspension mechanism; 51, cantilever frame; 511, vertical beam; 512, mounting beam; 513, inclined strut beam; 514, inclined connecting beam; 515, hinged plate; 52, hand-pulled trolley; 521, protection frame; 522, bearing seat plate; 523, threaded pin shaft; 524, locking nut; 525, bearing; 526, split pin; 6, storage rack; 61, cantilever support beam; 62, limiting stop; 7, pier. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be known by those skilled in the art that the embodiments described below are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0044] The principles and spirits of the present application will be described in detail below with reference to several representative embodiments of the present application.

[0045] Embodiment 1 of the protective device for high-speed rail precast beam support padstone grouting provided by the present application:

[0046] As Figure 1 , Figure 2 and Figure 3As shown, the protection device for high-speed railway precast beam support cushion stone grouting construction is integrally installed on the bridge girder erection machine 1, and comprises a hoisting mechanism 4, a suspension mechanism 5 and a storage rack 6.

[0047] As shown in Figure 7 and Figure 8 As shown, the rotating hanging basket 3 comprises a ladder 31, a first guard ring 32, a second guard ring 33 and a sliding platform 34 for personnel to stand on. The first guard ring 32, the second guard ring 33 and the sliding platform 34 are arranged in sequence from top to bottom. The first guard ring 32 and the second guard ring 33 are prior art and can protect the construction personnel on the ladder 31. A plurality of bolt hole positions are provided on the handrails on both sides of the ladder 31. The first guard ring 32 and the second guard ring 33 are provided with slide sleeves arranged in an upper and lower manner at both ends. The slide sleeves can slide up and down on the ladder 31, thereby adjusting the installation height of the first guard ring 32 and the second guard ring 33 on the ladder 31 to adapt to precast beams 2 of different cross sections. After the slide sleeves are adjusted in place, the slide sleeves are fastened with the ladder 31 by bolts, thereby fixing the first guard ring 32 and the second guard ring 33 with the ladder 31. Two lifting lugs 311 are installed on the top of the ladder 31, and a mounting rack 312 is located between the two lifting lugs 311. The lifting lugs 311 are connected with a shackle 313 and a steel wire rope. The mounting rack 312 is provided with a through hole extending in the upward and downward direction.

[0048] As shown in Figure 9 and Figure 10 As shown, the sliding platform 34 comprises a base 341, a sliding seat 342 and a guardrail. The sliding seat 342 is connected vertically to the base 341 and is in sliding cooperation with the ladder 31, so that the installation height of the sliding seat 342 can be adjusted. A locking structure is provided between the sliding seat 342 and the ladder 31. The locking structure is a common bolt and nut, that is, after the sliding seat 342 is slid into place, the sliding seat 342 is fastened with the ladder 31 by the bolt and the nut. The guardrail is arranged around the base 341 and comprises a first rail body 343, a second rail body 344 and a third rail body 345. The first rail body 343 and the second rail body 344 are parallel to each other and are connected vertically to the base 341. The third rail body 345 is arranged between the first rail body 343 and the second rail body 344 and is opposite to the ladder 31. The third rail body 345 is connected to the first rail body 343 by a hinge and forms an enclosure that can be opened and closed. In actual production, a locking assembly is arranged between the third rail body 345 and the second rail body 344. The locking assembly can adopt the form of plug sleeve and plug rod plug-in cooperation, so that the third rail body 345 can be closed when the construction personnel stand, thereby improving the protection of the construction personnel.

[0049] As shown in Figure 4 The suspension mechanism 5 comprises a cantilever frame 51 and a hand-pulled trolley 52. The hand-pulled trolley 52 serves as a driving device and can move on the cantilever frame 51. Specifically,Figure 5 As shown, the cantilever frame 51 comprises a vertical beam 511, a mounting beam 512 welded perpendicularly to the vertical beam 511, an inclined brace beam 513 welded between the bottom of the vertical beam 511 and the mounting beam 512, and an inclined connecting beam 514 welded at the top of the vertical beam 511 and the end of the mounting beam 512. The side of the vertical beam 511 is provided with a plurality of hinged plates 515, such as Figure 3 As shown, the hinged plates 515 are used to hinge with the bridge erecting machine 1 to adjust the horizontal installation angle of the entire cantilever frame 51. As shown Figure 6 As shown, the mounting beam 512 is an I-beam, and the wheels of the hand-pulled trolley 52 can walk on the I-beam. The hand-pulled trolley 52 is externally provided with a protective frame 521, and the protective frame 521 is provided with a rotating structure capable of adjusting the horizontal installation angle of the rotating hanging basket 3. In the embodiment, the rotating structure comprises a bearing seat plate 522 fixed at the bottom of the protective frame 521, a bearing 525 mounted on the bearing seat plate 522, and a threaded pin shaft 523 mounted on the bearing 525, such as Figure 11 As shown, the threaded pin shaft 523 passes through the mounting frame 312 at the top of the ladder 31, and the threaded pin shaft 523 is threadedly connected with lock nuts 524 on both upper and lower sides of the mounting frame 312. An open pin 526 is further provided below the lock nuts 524 on the threaded pin shaft 523. The lock nuts 524 are in upward and downward blocking cooperation with the mounting frame 312, realizing the detachable assembly of the ladder 31 and the suspension mechanism 5, and also realizing the rotation of the ladder 31. The hand-pulled chain of the hand-pulled trolley 52 is opposite to the sliding platform 34 in the upward and downward direction. When the construction personnel stand on the sliding platform 34, the movement of the entire rotating hanging basket 3 can be realized by pulling the hand-pulled chain, so that the rotating hanging basket 3 moves towards the direction close to the wet joint between the adjacent two precast beams 2. The ladder 31 can partially pass through the wet joint to limit the ladder 31.

[0050] In the embodiment, as shown Figure 12 As shown, the lifting mechanism 4 comprises a lifting frame 42 and a lifting mechanism mounted on the lifting frame 42. The lifting mechanism is a hand-crank structure, comprising a hand-crank winch 41, a steel wire rope wound on the hand-crank winch 41, and a hook 43 connected at the end of the steel wire rope. The hook 43 is used to hook the steel wire rope at the unlatching buckle 313 above the ladder 31. The lifting frame 42 is provided with a guide wheel 44 for the steel wire rope to pass through and guide the steel wire rope. The entire lifting frame 42 is hinged with a vertical column mounted on the bridge erecting machine 1 to realize the angle adjustment of the lifting frame 42 in the horizontal direction.

[0051] As shown Figure 2 As shown, the storage rack 6 is located below the lifting mechanism 4 and is used to support the rotating hanging basket 3. As shown Figure 13As shown, the storage rack 6 comprises two cantilever support beams 61 arranged in parallel and at intervals, and the ends of the cantilever support beams 61 away from the bridge girder erecting machine 1 are connected with limiting stop pieces 62 for limiting the climbing ladder 31. The rotating hanging basket 3 can be lifted to above the precast beam 2 by the hoisting mechanism and hung on the two cantilever support beams 61, and the rotating hanging basket 3 can be prevented from sliding off the cantilever support beams 61 under the action of the limiting stop pieces 62.

[0052] In actual construction, two groups of the protective device for high-speed rail precast beam support cushion stone grouting can be arranged on the two sides of the precast beam 2. According to the height of the precast beam 2, the installation height of the sliding platform 34, the first guard ring 32 and the second guard ring 33 is adjusted to match the height of the precast beam 2. The rotating hanging basket 3 is adjusted to be in the bridge longitudinal direction position, so that the personnel can reach the sliding platform 34 of the rotating hanging basket 3 from the beam surface of the erected precast beam 2, then the rotating hanging basket 3 is adjusted to be close to the pier 7, the third fence 345 is opened, and the personnel can reach the top of the pier 7 from the sliding platform 34, then the rotating hanging basket 3 is moved to the outside of the precast beam 2, and the beam falling of the next precast beam 2 is not affected. After the pier top support grouting and other operations are completed, the personnel pull the hand-pulled chain to adjust the position of the rotating hanging basket 3, so that the rotating hanging basket 3 is moved to the wet joint between the adjacent two precast beams 2, and the climbing ladder 31 passes through the wet joint to be close to the top of the pier 7, at this time, the personnel can open the third fence 345 to enter the sliding platform 34, the rotating hanging basket 3 is driven to move by the hand-pulled chain, and the horizontal rotation of the suspension mechanism 5 leaves the wet joint to reach the side surface of the precast beam 2, so that the personnel can reach the beam surface of the erected precast beam 2 through the climbing ladder 31. When climbing on the climbing ladder 31, the safety of the personnel is ensured by the two guard rings and the guardrails. When the erection of one precast beam 2 is completed, the rotating hanging basket 3 is adjusted to be in the bridge transverse direction position, and the bridge girder erecting machine 1 passes through the hole to erect the next precast beam 2. When the beam erection operation of the whole bridge is completed, when the bridge girder erecting machine 1 encounters the interference between the rotating hanging basket 3 and other structures during short-distance climbing, the rotating hanging basket 3 can be removed from the suspension mechanism 5 in advance, lifted by the hoisting mechanism 4 and placed on the cantilever support beam 61, and then the rotating hanging basket 3 is lowered to the construction position and connected with the suspension mechanism 5.

[0053] The utility model can adapt to the grouting construction of precast beam support cushion stones of different heights, the rotating hanging basket 3 does not need to be frequently replaced, can be applied in different working conditions, and is better in universality, and can meet the safety operation requirements of the personnel.

[0054] Embodiment 2 of the protective device for high-speed rail precast beam support cushion stone grouting construction provided by the utility model:

[0055] The difference between the embodiment 1 and the embodiment 2 mainly lies in that:

[0056] In the embodiment 1, the driving device in the suspension mechanism adopts a hand-pulled trolley.

[0057] In the embodiment, the driving device adopts a motor, at this time, a rack is arranged on the track of the mounting beam, a gear engaged with the rack is connected to the output shaft of the motor, the gear and the motor are both mounted on a frame body sleeved outside the mounting beam, the rotating structure is mounted at the bottom of the frame body, a pulley in sliding fit with the top of the mounting beam is mounted at the top of the frame body, a control cable is connected to the motor, and a remote controller is connected to the control cable, and an operator operates the remote controller to control the movement of the whole rotating hanging basket.

[0058] The embodiment 3 of the protective device for high-speed rail precast beam support pad stone grouting construction provided by the utility model mainly comprises:

[0059] The difference between the embodiment and the embodiment 1 mainly lies in that:

[0060] In the embodiment 1, the hoisting mechanism is a hand-operated mechanism.

[0061] In the embodiment, the hoisting mechanism is an electric mechanism, and a common winch is adopted.

[0062] In the description of the present specification, the meaning of "a plurality of" is at least two, for example, two, three or more, etc., unless otherwise explicitly and specifically limited.

[0063] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A protective device for grouting construction of precast beam support pads in high-speed railways, characterized in that, Includes a hoisting mechanism, a suspension mechanism, and a storage rack for installation on a bridge erecting machine; a rotating hanging basket is detachably connected to the suspension mechanism. The rotating hanging basket includes a ladder, a protective ring installed on the ladder, and a sliding platform for personnel to stand on. The sliding platform is mounted on the ladder in an adjustable position in the vertical direction. The rotating hanging basket is movably mounted on the suspension mechanism to approach the wet joint between two adjacent precast beams, and the ladder is able to partially pass through the wet joint. The hoisting mechanism is located above the storage rack and is used to hoist the rotating basket above the precast beam and attach it to the storage rack, which supports the rotating basket.

2. The protective device for grouting construction of precast beam support pads for high-speed railways according to claim 1, characterized in that, The suspension mechanism includes a cantilever frame and a drive device that is movably mounted on the cantilever frame. The drive device is equipped with a rotary structure that can rotate in the horizontal direction. The top of the ladder is detachably connected to the rotary structure.

3. The protective device for grouting construction of precast beam support pads for high-speed railways according to claim 2, characterized in that, The drive device is a hand-operated trolley, and the cantilever frame has a track for the wheels of the hand-operated trolley to travel on. The hand chain of the hand-operated trolley is vertically opposite to the sliding platform. The hand-operated trolley is equipped with a protective frame. The rotating structure includes a bearing seat plate fixed to the bottom of the protective frame, a bearing mounted on the bearing seat plate, and a threaded pin mounted on the bearing. The top of the ladder is connected to a mounting frame. The threaded pin passes through the mounting frame and is threaded with locking nuts on both the upper and lower sides of the mounting frame.

4. The protective device for grouting construction of precast beam support pads for high-speed railways according to claim 2, characterized in that, The horizontal installation angle of the cantilever frame is adjustable.

5. The protective device for grouting construction of precast beam support pads for high-speed railways according to any one of claims 1-4, characterized in that, The protective rings are arranged at intervals in the vertical direction.

6. The protective device for grouting construction of precast beam support pads for high-speed railways according to claim 5, characterized in that, The protective ring is adjustable in position along the vertical direction and is mounted on the ladder.

7. The protective device for grouting construction of precast beam support pads for high-speed railways according to claim 5, characterized in that, The sliding platform includes a base, a slide block, and a guardrail. The slide block is vertically connected to the base and slides in cooperation with the ladder. A locking structure is provided between the slide block and the ladder. The guardrail surrounds the base and includes a barrier that is opposite to the ladder and can be opened and closed.

8. The protective device for grouting construction of precast beam support pads for high-speed railways according to any one of claims 1-4, characterized in that, The hoisting mechanism includes a gantry and a hoisting mechanism mounted on the gantry. The hoisting mechanism is a hand-cranked structure, including a hand-cranked winch, a steel wire rope wound on the hand-cranked winch, and a hook connected to the end of the steel wire rope. The hook is used to hook the ladder. The gantry is provided with guide wheels for the steel wire rope to pass around and to cooperate with the guide of the steel wire rope.

9. The protective device for grouting construction of precast beam support pads for high-speed railways according to claim 8, characterized in that, The horizontal installation angle of the hanger is adjustable.

10. The protective device for grouting construction of precast beam support pads for high-speed railways according to any one of claims 1-4, characterized in that, The storage rack includes two parallel cantilever support beams spaced apart, with a limit stop connected to the end of the cantilever support beam away from the bridge erecting machine for limiting the ladder.

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