Bridge prefabricated guardrail and construction method

Abstract

The application discloses a bridge prefabricated guardrail and a construction method thereof, and relates to the field of bridge guardrails, which comprises a plurality of guardrail bodies used for being installed on a bridge deck, a sliding groove is formed on the bridge deck and used for allowing the guardrail bodies to slide along the length direction of the bridge deck, sliding blocks are arranged on the guardrail bodies and used for being inserted into the sliding groove, and the sliding groove is used for limiting the sliding blocks from being separated from the sliding groove in the vertical direction; a channel is formed on one side of the length direction of the sliding groove and used for allowing the sliding blocks to be inserted into the sliding groove, and a side plate is fixedly connected to the bridge deck through screws and used for covering the channel, the guardrail bodies are arranged in a plurality of modes, when being installed, the guardrail bodies are slid to the installation positions on the bridge deck one by one in a sliding mode, then the channel is closed through the side plate, and the whole installation process is simple and convenient, and the manpower is very small, meanwhile, the guardrail bodies can be prefabricated in a factory, so that long-time on-site construction is not needed, the construction period is reduced, compared with on-site pouring, the concrete does not need to be prepared on site, and the environmental pollution is reduced.

Description

Technical Field

[0001] This application relates to the field of bridge railings, and in particular to a prefabricated bridge railing and its construction method. Background Technology

[0002] Currently, bridge railings are generally constructed using on-site casting. During on-site casting, railing templates are first erected on both sides of the bridge deck, and steel cages are placed inside. Then, a casting trolley is used to pour concrete into the railing templates.

[0003] Regarding the aforementioned technologies, the inventors believe that the on-site casting method for guardrails results in a long construction period and easily generates dust, causing environmental pollution. Summary of the Invention

[0004] To address the drawbacks of on-site casting of guardrails, this application provides a precast bridge guardrail and its construction method.

[0005] Firstly, this application provides a prefabricated bridge guardrail, which adopts the following technical solution:

[0006] A prefabricated bridge railing includes multiple railing bodies for installation on a bridge deck. The bridge deck has grooves for the railing bodies to slide along its length. Each railing body has a slider for inserting into the groove, and the groove restricts the slider from disengaging vertically. One end of the groove has a channel for the slider to insert into the groove, and a side plate for covering the channel is fixedly connected to the bridge deck by screws.

[0007] By adopting the above technical solution, when installing the guardrail body, the slider is inserted from the through groove into the slide groove, and then the guardrail body is moved to the other end of the bridge deck. Then, multiple guardrail bodies are installed on one side of the bridge deck one by one, and finally the side plate is covered by the passage and fixed with screws. The guardrail body can be prefabricated in the factory, thus eliminating the need for long-term on-site construction and reducing the construction cycle. Compared with on-site casting, there is no need to prepare concrete on-site, reducing environmental pollution. At the same time, there is no need to use formwork and other casting construction accessories, saving resources. Moreover, the entire process does not require the use of large construction equipment, reducing noise pollution. In addition, the installation method of the guardrail body is simple and convenient, saving labor.

[0008] Optionally, a plate is provided on one side of the guardrail body, and a slot for inserting the plate is provided on the other side of the guardrail body. A fixing groove for inserting the plate is provided on the side of the slide away from the channel. A plug for inserting into the slot is fixedly connected to the side plate.

[0009] By adopting the above technical solution, when the guardrail bodies are installed one by one, the insert plate can be inserted into the fixing groove and slot, and the insert block can be inserted into the slot, thereby connecting multiple guardrail bodies into a whole and improving the stability of the guardrail.

[0010] Optionally, the slider is vertically inserted into the bottom surface of the guardrail body, and the insert plate is inserted into the guardrail body along the length of the groove. The guardrail body is provided with a spring for driving the insert plate to be fully inserted into the guardrail body. A positioning rod is vertically inserted into the guardrail body, and a guide block is fixedly connected to the insert plate. The guide block is used to drive the insert plate to extend out of the guardrail body when the positioning rod moves vertically downward. The guardrail body is provided with a driving component for driving the positioning rod to move vertically.

[0011] By adopting the above technical solution, when a guardrail body is damaged and needs to be replaced, the driving component moves the positioning rod, causing it to disengage from the guide block. Under the action of the spring, the insert plate is fully inserted into the guardrail body. Simultaneously, the above steps are repeated to retract the insert plate next to the damaged guardrail body into the guardrail body, thus removing the obstruction and allowing the guardrail body to be removed. When installing a new guardrail body, the guardrail body is installed on the slider, and then the driving component moves the positioning rod down. Under the action of the guide block, the insert plate is pushed out and inserted into the slot of the adjacent guardrail body. This facilitates the replacement of the damaged guardrail body.

[0012] Optionally, the insert plate has a through hole for the positioning rod to pass through, the slider has a positioning hole for the positioning rod to be vertically inserted, a sliding block is slidably provided on the side wall of the positioning hole, a through groove is provided on the side wall of the positioning hole for the sliding block to be fully inserted, the guardrail body has a slot for the sliding block to be inserted, the upper surface of the sliding block is a guide surface, the guide surface is used to drive the sliding block to partially insert into the slot when the positioning rod moves vertically downward, and a spring is provided in the through groove for resetting the sliding block.

[0013] By adopting the above technical solution, after the guardrail body is moved to the installation position, the positioning rod is driven to move down by the driving component. Under the action of the guide block, the insert plate extends out of the guardrail body and inserts into the slot on the adjacent guardrail body. At this time, the through hole moves to the bottom of the positioning rod, so the positioning rod continues to move down. After passing through the through hole, it pushes the sliding block to slide under the action of the guide surface. The sliding block moves and inserts into the slot, thereby connecting the slider and the guardrail body together through the sliding block, enhancing the stability of the guardrail body.

[0014] Optionally, a rod is slidably connected to the inner vertical direction of the guardrail body, a sealing groove is provided on the guardrail body for the rod to slide, and an insertion hole is provided on the bridge surface for the rod to be inserted. The slot and the sealing groove are connected, and a piston is slidably connected in the slot. When the sliding block is inserted into the slot, it pushes the piston to move to drive the rod to be inserted into the insertion hole. A spring is provided in the sealing groove for resetting the rod.

[0015] By adopting the above technical solution, after the sliding block is inserted into the slot, the piston moves, thereby driving the insertion rod to move under the action of air pressure, so that the insertion rod is inserted into the insertion hole, thereby connecting the guardrail body and the bridge deck together, enhancing the stability of the guardrail body.

[0016] Secondly, this application provides a construction method for prefabricated bridge railings, which adopts the following technical solution:

[0017] A construction method for a prefabricated bridge railing includes the following steps: Step 1, inserting the railing body into the slide along the channel, and then using a pushing component to move the railing body to the other end of the bridge deck; Step 2, after installing all the railing bodies on the bridge deck, covering the channel with side panels and fixing them with screws.

[0018] By adopting the above technical solution, the main body of the guardrail can be moved by the pushing component, which can reduce manpower.

[0019] Optionally, the pushing component includes a moving block for insertion into the slide groove, the moving block being rotatably connected to a roller for abutting the bridge surface, the moving block being provided with a motor for driving the roller to rotate, and the moving block being provided with a push rod for pushing the guardrail body to move.

[0020] By adopting the above technical solution, when the main body of the guardrail is moved, motor one is turned on, which drives the roller to rotate, thereby driving the moving block to move. Under the action of the push rod, the main body of the guardrail is moved. The pushing component has a simple structure and is easy to operate.

[0021] Optionally, the guardrail body has a positioning groove for the vertical movement of the positioning rod, and an inflation groove is provided on the guardrail body. The inflation groove passes through the guardrail body and is connected to the positioning groove. The driving component includes a second piston, which is disposed in the inflation groove. The second piston has a hanging ring on it. Two locking plates are slidably connected to the moving block. The two locking plates are brought close to each other to engage the hanging ring. The moving block has a second motor for driving the two locking plates to move close to each other. The inflation groove has a fourth spring for resetting the second piston.

[0022] By adopting the above technical solution, when installing the guardrail body, first pull out piston two to move the positioning rod upward, causing the positioning rod to disengage from the guide block. Then, motor two drives the two clamping plates to move closer together, hooking the hanging ring. Next, the pushing component pushes the guardrail body to the installation position. Then, motor two moves the two clamping plates away from each other, the hanging ring loses its obstruction, and resets under the action of spring four. Under the action of air pressure, the positioning rod moves downward, thereby pushing out the insert plate part and pushing the sliding block part into the slot. At the same time, the insert rod is inserted into the insertion hole of the bridge deck, which greatly ensures the stability of the guardrail body.

[0023] In summary, this application includes the following beneficial technical effects:

[0024] 1. This application sets up multiple guardrail bodies. During installation, the guardrail bodies are slid one by one to the installation position on the bridge deck by sliding. Then, the passage is closed by the side panels. The whole installation process is simple and convenient, requiring very little manpower. At the same time, the guardrail bodies can be prefabricated in the factory, thus eliminating the need for long-term on-site construction and reducing the construction period. Compared with on-site casting, there is no need to prepare concrete on-site, reducing environmental pollution.

[0025] 2. This application features a detachable connection between the guardrail body and the slider, facilitating the replacement of damaged guardrail bodies. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a prefabricated bridge guardrail applied to a bridge deck according to this application;

[0027] Figure 2 This is a structural schematic diagram of a prefabricated bridge guardrail with side panels according to this application;

[0028] Figure 3 yes Figure 1 A partial structural sectional view;

[0029] Figure 4 This is a schematic diagram of the overall structure of Embodiment 1 of the construction method for a prefabricated bridge railing in this application;

[0030] Figure 5 yes Figure 4 A partial structural sectional view;

[0031] Figure 6 yes Figure 4 Enlarged view of region A in the middle;

[0032] Figure 7 This is a schematic diagram of the hanging ring and the clamping plate in Embodiment 2 of the construction method for a prefabricated bridge railing of this application;

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Guardrail body; 2. Bridge deck; 3. Slide rail; 4. Slider; 5. Slide groove; 6. Channel; 7. Side plate; 9. Slot; 12. Disassembly groove; 15. Positioning rod; 18. Screw; 19. Operating ring; 20. Through hole; 21. Positioning hole; 22. Sliding block; 23. Through groove; 24. Card slot; 25. Spring II; 26. Sliding rod; 27. Guide surface; 28. Fitting surface II; 29. ​​Insert rod; 30. Sealing groove; 31. Insertion hole; 32. Piston I; 33. Spring III; 34. Moving block; 35. Roller; 36. Motor I; 37. Inflation groove; 38. Positioning groove; 39. Piston II; 40. Hanging ring; 41. Spring IV; 42. Fixing rod; 43. Mounting bracket; 45. Card plate; 46. Two-way screw; 47. Motor II. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0036] This application discloses a prefabricated bridge railing. (Refer to...) Figure 1 and Figure 2 The prefabricated bridge railing includes multiple railing bodies 1 for installation on the bridge deck 2. Slide rails 3 are fixedly connected to both sides of the upper surface of the bridge deck 2 along its length. The slide rails 3 are set along the length of the bridge deck 2. A slider 4 is installed on each railing body 1. The slider 4 has a T-shaped cross-section. The slide rail 3 has a groove 5 along its length for the slider 4 to slide. The slider 4 is inserted into the groove 5 to prevent it from detaching from the slide rail 3 vertically. Channels 6 for the slider 4 to slide out are provided at both ends of the slide rail 3 along its length. Side plates 7 for covering the channels 6 are fixedly connected to both ends of the slide rail 3 with screws at each end. In actual use, one side plate 7 is first removed, and then each railing body 1 is slid along the groove 5 to the other end of the slide rail 3. After all railing bodies 1 are installed, the side plates 7 are fixed to the slide rail 3 with screws.

[0037] Reference Figure 2 and Figure 3 To ensure the stability of the guardrail body 1, a plate is provided on one side of the guardrail body 1, and a slot 9 for inserting the plate is provided on the other side of the guardrail. One side plate 7 has a fixing groove for inserting the plate, and the other side plate 7 is fixedly connected with a plug for inserting into the slot 9.

[0038] Reference Figure 1 and Figure 3 In use, the guardrail body 1 is slid along one end of the slide rail 3 to the other end of the slide rail 3 one by one. During this process, adjacent guardrail bodies 1 are connected together by insert plates and slots 9. The guardrail bodies 1 at both ends of the slide rail 3 are inserted into the fixed slots by insert plates, and the insert blocks are inserted into the slots 9 and connected to the slide rail 3, thereby connecting multiple guardrail bodies 1 into a whole and ensuring the stability of the guardrail bodies 1.

[0039] Reference Figure 3 and Figure 4 In addition, to facilitate the replacement of individual guardrail bodies 1, a slider 4 is vertically inserted into the bottom of the guardrail body 1, and an insert plate is inserted into the guardrail body 1 along the length of the sliding groove 5. The bottom surface of the guardrail body 1 has a disassembly groove 12 for vertical insertion of the slider 4, and a storage groove for complete insertion of the insert plate is provided on the guardrail body 1. A spring is fixedly connected inside the storage groove, with its length along the length of the insert plate. The other end of the spring is fixedly connected to the insert plate. When the spring is not deformed, the insert plate is completely located in the storage groove. Multiple positioning rods 15 are slidably connected vertically inside the guardrail body 1. In this embodiment... Two positioning rods 15 are provided. A positioning groove 38 for vertical movement of the positioning rods 15 is provided in the guardrail body 1. An insert plate is located below the positioning rods 15. A guide block is fixedly connected to the insert plate on the moving path of the positioning rods 15. The guide block is used to drive the insert plate to extend out of the guardrail body 1 when the positioning rods 15 move vertically downward. The side of the guide block that the positioning rods 15 abuts is an inclined surface. In this embodiment, the height of the inclined surface gradually decreases in the direction away from the spring. The side of the lower end of the positioning rods 15 that abuts the inclined surface is a fitting surface adapted to the inclined surface. The guardrail body 1 is provided with a driving component for driving the positioning rods 15 to move vertically.

[0040] The positioning rod 15 is driven to move downward by the driving component. Under the action of the guide block, the positioning rod 15 pushes the insert plate to slide, so that the insert plate part extends out of the storage groove.

[0041] In this embodiment, the driving component includes a screw 18, which is vertically arranged. The lower end of the screw 18 is rotatably connected to the upper end of the positioning rod 15, and the upper end of the screw 18 is threaded through the upper surface of the guardrail body 1 and fixedly connected to an operating ring 19.

[0042] In addition, to prevent the guardrail body 1 from detaching from the slider 4, a through hole 20 is provided on the insert plate for the positioning rod 15 to pass through. The positioning rod 15 moves downward and, under the action of the guide block, drives the insert plate to slide, thereby aligning the through hole 20 and the positioning rod 15, so that the positioning rod 15 passes vertically through the through hole 20. A positioning hole 21 is provided on the slider 4 for the positioning rod 15 to be inserted vertically. A sliding block 22 is slidably connected to the side wall of the positioning hole 21. A through groove 23 is provided on the side wall of the positioning hole 21 for the sliding block 22 to be fully inserted. A sliding rod 26 is fixedly connected to the end of the sliding block 22 away from the positioning hole 21. A slot 24 is provided on the side wall of the disassembly groove 12 for the sliding rod 26 to be inserted. The end of the sliding rod 26 away from the sliding block 22 passes through the through groove 23 and is inserted into the slot 24. A second spring 25 is fixedly connected in the through groove 23. The second spring 25 is sleeved on the sliding rod 26. When the second spring 25 is not deformed, the sliding rod 26 is completely located in the through groove 23. The upper surface of the sliding block 22 is a guide surface 27. The guide surface 27 is used to drive the sliding rod 26 to partially insert into the slot 24 when the positioning rod 15 moves vertically downward. The positioning rod 15 moves vertically downward to abut against the guide surface 27. The height of the guide surface 27 gradually decreases in the direction away from the second spring 25. The side of the lower end of the positioning rod 15 that abuts against the guide surface 27 is a fitting surface 28 that is adapted to the guide surface 27.

[0043] When the positioning rod 15 passes through the through hole 20 and is inserted into the positioning hole 21, it pushes the sliding rod 26 to move under the action of the guide surface 27, so that the sliding rod 26 is simultaneously located in the through groove 23 and the slot 24, thereby allowing the guardrail body 1 to detach from the slider 4 in the vertical direction and ensuring the stability of the guardrail body 1.

[0044] In addition, to enhance the stability of the connection between the guardrail body 1 and the slide rail 3, a rod 29 is slidably connected to the inner vertical direction of the guardrail body 1. A sealing groove 30 is provided on the body for the rod 29 to slide. The rod 29 and the sealing groove 30 are in a sealed setting. An insertion hole 31 for the rod 29 to be inserted is provided on the upper surface of the slide rail 3. The slot 24 and the sealing groove 30 are connected. A piston 32 is slidably connected in the slot 24. The piston 32 and the slot 24 are in a sealed setting. When the sliding rod 26 is inserted into the slot 24, it pushes the piston 32 to move so as to drive the rod 29 to be inserted into the insertion hole 31. A spring 33 is fixedly connected in the sealing groove 30. The length direction of the spring 33 is set along the length direction of the rod 29. When the spring 33 is not deformed, the rod 29 is completely located in the sealing groove 30.

[0045] The implementation principle of a prefabricated bridge railing according to an embodiment of this application is as follows: When installing the railing body 1, the railing body 1 is inserted into the slider 4, and then the screw 18 is rotated to disengage the positioning rod 15 from the guide block. At this time, the insertion rod 29 is located in the sealing groove 30, the insertion plate is located in the receiving groove, and the sliding rod 26 is located in the through groove 23. Then, the railing body 1 is moved to the installation position of the slide rail 3, and then the screw 18 is rotated to drive the positioning rod 15 to move vertically downward. Under the action of the guide block, the insertion plate part passes through the railing body 1 and is inserted into the slot 9 or the fixing groove. At the same time, the positioning... As rod 15 continues to move downward, positioning rod 15 passes through through hole 20 to prevent insert plate from resetting. Positioning rod 15 continues to move downward and inserts into positioning hole 21, pushing sliding block 22 to slide, causing sliding rod 26 to slide, so that sliding rod 26 is partially inserted into slot 24, connecting slider 4 and guardrail body 1. As sliding rod 26 is inserted into slot 24, piston 32 is pushed to move. Under the action of air pressure, insert rod 29 moves downward, so that insert rod 29 is inserted into insertion hole 31, connecting guardrail body 1 and slide rail 3, ensuring the stability of guardrail body 1.

[0046] This application also discloses a construction method for prefabricated bridge railings.

[0047] Example 1;

[0048] Reference Figure 4 and Figure 5 A construction method for a prefabricated bridge railing includes the following steps: Step 1: Remove one side panel 7, insert the railing body 1 into the slide groove 5 along the channel 6, and then use the pushing component to move the railing body 1 to the other end of the slide rail 3; Step 2: After the railing body 1 has moved to the installation position of the slide rail 3, use the driving component to drive the positioning rod 15 down to extend the insert plate; Step 3: Push the railing body 1 to the installation position of the slide rail 3 one by one, and use the driving component to position the railing body 1; Step 4: After all the railing bodies 1 are installed on the bridge deck 2, remove the side panel 7 to cover the channel 6 and fix it with screws.

[0049] In this embodiment, the driving component is a screw 18 in a prefabricated bridge guardrail disclosed in this application.

[0050] Reference Figure 5 and Figure 6 The pushing component includes a movable block 34, which is inserted into the slide 5 and is adapted to the slide 5. The movable block 34 is rotatably connected to a roller 35 for abutting the upper surface of the slide rail 3. The movable block 34 is provided with a motor 36 for driving the roller 35 to rotate. The motor 36 drives the roller 35 to rotate through a pulley. A push rod for pushing the guardrail body 1 to move is fixedly connected to the movable block 34.

[0051] Example 2;

[0052] Reference Figure 7 The difference between this embodiment and embodiment 1 is that the positioning rod 15 and the positioning groove 38 are sealed. An inflation groove 37 is provided on the guardrail body 1. The inflation groove 37 is arranged along the length of the guardrail body 1 and passes through one side of the guardrail body 1. The inflation groove 37 is connected to the positioning groove 38 through a connecting groove. The driving component includes a second piston 39, which is slidably disposed in the inflation groove 37 along its length. A hanging ring 40 is fixedly connected to the side of the second piston 39 away from the opening of the inflation groove 37. A fourth spring 41 is fixedly connected to the inflation groove 37 along its length. The other end of the fourth spring 41 is fixedly connected to... On piston 39, a fixed rod 42 is fixedly connected to the side of the moving block 34 where the push rod is located. A mounting bracket 43 is fixedly connected to the end of the fixed rod 42 away from the moving block 34. Two clamping plates 45 are slidably connected to the mounting bracket 43 in the vertical direction. The two clamping plates 45 are close to each other to hook the hanging ring 40. A bidirectional lead screw 46 is rotatably connected to the mounting bracket 43. The length direction and rotation axis of the bidirectional lead screw 46 are both set in the vertical direction. The two clamping plates 45 are respectively threaded to the two reverse threads of the bidirectional lead screw 46. Motor 47 is fixedly connected to the mounting bracket 43. The output shaft of motor 47 is coaxially fixedly connected to the upper end of the bidirectional lead screw 46.

[0053] In addition, to facilitate the disassembly of the guardrail body 1, a pull rod is fixedly connected to the upper section of the positioning rod 15. The other end of the pull rod passes through the guardrail body 1 and is fixedly connected to a pull ring. The guardrail body 1 and the position where the pull rod passes through are sealed to the outer wall of the pull rod.

[0054] The implementation principle of the construction method of a prefabricated bridge railing in this application embodiment is as follows: When installing the railing body 1, first pull the hanging ring 40 outward to move the positioning rod 15 upward. Then turn on the second motor 47 to drive the two clamping plates 45 to move closer to each other and hook the hanging ring 40. Then turn on the first motor 36 to drive the moving block 34 to move and push the railing body 1 to the installation position. Then turn on the second motor 47 to drive the double-acting screw 46 to rotate, so that the two clamping plates 45 move away from each other and the hanging ring 40 loses its obstruction. The second piston 39 is reset under the action of the fourth spring 41, inflating the air groove 37 and causing the positioning rod 15 to move downward. As a result, the insert plate part extends out of the receiving groove, the sliding rod 26 is inserted into the clamping groove 24, and the insert rod 29 is inserted into the insertion hole 31 of the slide rail 3 to ensure the stability of the railing body 1.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A prefabricated bridge railing, characterized in that: The system includes multiple guardrail bodies (1) for installation on a bridge deck (2). A groove (5) is provided on the bridge deck (2) for the guardrail body (1) to slide along the length of the bridge deck (2). A slider (4) is provided on each guardrail body (1) for insertion into the groove (5), and the groove (5) restricts the slider (4) from vertically disengaging from the groove (5). A channel (6) is provided on one side wall of the groove (5) for the slider (4) to insert into the groove (5). A side plate (7) is fixedly connected to the bridge deck (2) by screws to cover the channel (6). A plate is provided on one side of each guardrail body (1), and a slot (9) is provided on the other side for the plate to be inserted. The groove (5) is located away from the channel. A fixed groove for inserting the insert plate is provided on one side of the (6) side plate (7), and an insert block (11) for inserting into the slot (9) is fixedly connected on the side plate (7). The slider (4) is inserted vertically into the bottom surface of the guardrail body (1). The insert plate is inserted into the guardrail body (1) along the length of the slide groove (5). The guardrail body (1) is provided with a spring for driving the insert plate to be fully inserted into the guardrail body (1). A positioning rod (15) is inserted vertically into the guardrail body (1). A guide block is fixedly connected on the insert plate. The guide block is used to drive the insert plate to extend out of the guardrail body (1) when the positioning rod (15) moves vertically downward. The guardrail body (1) is provided with a driving member for driving the positioning rod (15) to move vertically.

2. A prefabricated bridge railing according to claim 1, characterized in that: The insert plate has a through hole (20) through which the positioning rod (15) passes. The slider (4) has a positioning hole (21) for the positioning rod (15) to be vertically inserted. A sliding block (22) is slidably provided on the side wall of the positioning hole (21). A through groove (23) is provided on the side wall of the positioning hole (21) for the sliding block (22) to be fully inserted. A slot (24) is provided on the guardrail body (1) for the sliding block (22) to be inserted. The upper surface of the sliding block (22) is a guide surface (27). The guide surface (27) is used to drive the sliding block (22) to partially insert into the slot (24) when the positioning rod (15) moves vertically downward. A spring (25) is provided in the through groove (23) for resetting the sliding block (22).

3. A prefabricated bridge railing according to claim 2, characterized in that: A rod (29) is slidably connected to the inner vertical direction of the guardrail body (1). A sealing groove (30) is provided on the guardrail body (1) for the rod (29) to slide. A socket (31) is provided on the bridge surface (2) for the rod (29) to be inserted. The slot (24) and the sealing groove (30) are connected. A piston (32) is slidably connected in the slot (24). When the sliding block (22) is inserted into the slot (24), it pushes the piston (32) to move so as to drive the rod (29) to be inserted into the socket (31). A spring (33) is provided in the sealing groove (30) for resetting the rod (29).

4. A construction method for a precast bridge railing according to any one of claims 1-3, characterized in that: The steps include: Step 1, inserting the guardrail body (1) into the slide groove (5) along the channel (6), and then using the pushing component to push the guardrail body (1) to the other end of the bridge deck (2); Step 2, after installing all the guardrail bodies (1) on the bridge deck (2), covering the channel (6) with the side plate (7) and fixing it with screws.

5. The construction method for a precast bridge railing according to claim 4, characterized in that: The pushing component includes a moving block (34) for insertion into the slide groove (5), the moving block (34) is rotatably connected to a roller (35) for abutting the bridge surface (2), the moving block (34) is provided with a motor (36) for driving the roller (35) to rotate, and the moving block (34) is provided with a push rod for pushing the guardrail body (1) to move.

6. The construction method for a precast bridge railing according to claim 5, characterized in that: The guardrail body (1) has a positioning groove (38) for the vertical movement of the positioning rod (15). The guardrail body (1) has an inflation groove (37) that penetrates the guardrail body (1) and is connected to the positioning groove (38). The driving component includes a piston (39) that is disposed in the inflation groove (37). The piston (39) has a hanging ring (40) on it. Two locking plates (45) are slidably connected to the moving block (34). The two locking plates (45) are close to each other to hook the hanging ring (40). The moving block (34) has a motor (47) for driving the two locking plates (45) to close to each other. The inflation groove (37) has a spring (41) for resetting the piston (39).

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