A type of bridge edge folding guardrail during construction

Abstract

This utility model discloses a bridge deck edge folding guardrail for construction, belonging to the technical field of auxiliary devices for road and bridge construction. It includes a box girder; embedded reinforcing bars are provided at the bridge deck edge of the top of the box girder; at least two vertically placed supports are provided in the gaps between the embedded reinforcing bars; the supports are arranged along the length of the box girder; a grid-like lower guardrail is provided between the supports; a flipping frame is rotatably installed on the top of the two furthest supports; an upper guardrail is provided between the two flipping frames; a limiting device is installed between the flipping frame and the supports; when the flipping frame flips to directly above the supports, the supports can restrict the movement of the flipping frame through the limiting device. This utility model effectively solves the problem that traditional guardrails require removal and reinstallation during the bridge erection machine's passage through the span, resulting in a protective gap and significant safety hazards, while also affecting construction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary devices for road and bridge construction, specifically to a folding guardrail for the edge of a bridge during construction. Background Technology

[0002] In the field of road and bridge construction, especially during the superstructure construction phase, bridge edge protection is a crucial safety measure. Currently, the commonly used bridge edge protection railings in the industry typically consist of fixed inverted T-shaped structures welded from materials such as steel pipes. While this traditional railing provides basic protection, in actual construction, when the bridge erecting machine is crossing a span, these fixed, rigid railings directly obstruct its passage. Construction workers must completely remove the installed railings before the machine crosses the span. Only after the machine has safely passed and reached its new working position are the railings reinstalled at the bridge edge. During the period between removal and reinstallation, the bridge edge area is unprotected, creating a significant safety gap. During this gap, construction workers, small equipment, or materials face a significant risk of falling from the bridge deck, posing a serious safety hazard to the construction site. Furthermore, the repeated dismantling and reinstallation process increases the labor intensity of workers, wastes time, and affects construction efficiency. Therefore, it is necessary to design a guardrail solution that can provide effective edge protection and allow for quick passage without the need for complete removal when the bridge erecting machine passes through the hole. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a bridge side folding guardrail for construction, so as to solve the problem that the traditional guardrail needs to be removed and reinstalled during the process of the bridge erecting machine passing through the hole, resulting in a protection gap and posing a great safety hazard, and also affecting the construction efficiency.

[0004] To solve the above problems, this utility model provides the following technical solution:

[0005] A bridge deck edge folding guardrail for construction includes a box girder; embedded steel bars are provided at the bridge deck edge of the top of the box girder; at least two vertically placed supports are provided in the gaps between the embedded steel bars; the supports are arranged along the length of the box girder; a grid-like lower guardrail is provided between the supports; a flipping frame is rotatably installed on the top of the two farthest supports; an upper guardrail is provided between the two flipping frames; a limit clamp is installed between the flipping frame and the supports; when the flipping frame flips to directly above the supports, the supports can restrict the movement of the flipping frame by the limit clamp.

[0006] Preferably, the support frame includes a base plate placed on the top surface of the box girder; the base plate is clamped between the pre-embedded reinforcing bars along the width direction of the box girder, and an upright is provided in the middle of the base plate; a connector is provided on the upper side of the upright; at least two pull ropes are provided on the connector; the other end of the pull rope is connected to the pre-embedded reinforcing bars.

[0007] Furthermore, the base plate is an L-shaped plate structure; reinforcing ribs are also provided between the base plate and the uprights; and turnbuckles for adjusting the tightness are also provided on the pull ropes.

[0008] Preferably, the lower guardrail is located above the pre-embedded reinforcing bars; the lower guardrail includes two or more parallel horizontal bars, and several vertical connecting bars are provided between the horizontal bars.

[0009] Furthermore, the upper guardrail includes horizontal bars; a support bar is provided on the horizontal bar at a position directly opposite the vertical connecting bar or the upright; and a matching buckle is provided on the opposite end of the support bar and the vertical connecting bar or the upright.

[0010] Preferably, positioning blocks are installed on both the upright frame and the flipping frame; each of the two positioning blocks is provided with a matching hinge; the upright frame and the flipping frame are hinged together by the hinges.

[0011] Furthermore, the limiting device includes hollow tubes installed on two corresponding positioning blocks of the upright and the tilting frame; the hollow tubes are arranged vertically; a T-pin is detachably provided on the hollow tube of the tilting frame; when the tilting frame is tilted to directly above the upright, the two hollow tubes are coaxial, and the T-pin can pass through the two hollow tubes from top to bottom to complete the locking.

[0012] Preferably, protective netting is installed on both the upper and lower guardrails.

[0013] The beneficial effects of this utility model are reflected in the following aspects:

[0014] 1. The core advantage of this utility model lies in its foldability. When the bridge erecting machine needs to pass through the span, it is only necessary to release the limiting clips. There is no need to completely dismantle the guardrail structure. The flipping frame and the upper guardrail can be flipped and folded up to the inside or outside of the bridge deck to make room for the bridge erecting machine to pass. During this process, the lower guardrail and the upright structure remain in place, providing continuous and basic edge protection. This effectively avoids the gap period where the bridge deck edges are completely unprotected after the removal of traditional fixed guardrails, and reduces the risk of construction personnel, small equipment or materials falling from height.

[0015] 2. Compared to traditional fixed guardrails that require repeated disassembly and reassembly, this utility model only requires the folding and unfolding of the flipping frame and the upper guardrail. The operation is simple, quick, and saves time and effort. This reduces the time and labor costs spent on disassembling and reassembling guardrails, speeds up the connection between the bridge erecting machine and subsequent construction, and improves the overall construction efficiency. Workers no longer need to perform heavy disassembly, transportation, and reinstallation of fixed guardrails, greatly reducing labor intensity.

[0016] 3. The base plate is secured between the embedded steel bars and anchored to them with ropes. The L-shaped base plate and reinforcing bars enhance the anti-overturning capacity of the support frame, ensuring the stability of the overall structure on the bridge deck. When the limit clamps are in the unfolded state, they can firmly lock the tilting frame directly above the support frame, forming a rigid connection. This ensures that the upper and lower guardrails together form a stable protective barrier, meeting the protection strength requirements. The structure of the upper and lower guardrails themselves, as well as the connection through multiple support frames, ensures the overall rigidity and protection range of the guardrail.

[0017] 4. The folding and unfolding actions are achieved through a hinged flipping frame, and the design of the limiting clips makes locking and unlocking operations intuitive, simple, and quick. The entire system is designed with ease of construction in mind, and its structure is durable, allowing for repeated installation and use at different stages of bridge construction or across different bridge spans. Protective netting installed on the upper and lower guardrails effectively prevents small tools, parts, or gravel from falling through the grid gaps, providing more comprehensive safety protection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention in an embodiment;

[0019] Figure 2 This is a schematic diagram of the frame structure in this embodiment;

[0020] Figure 3 This is a schematic diagram of the structure of the two positioning blocks and corresponding limiting clips on the upright frame and the flipping frame in this embodiment;

[0021] Explanation of reference numerals in the attached drawings: 1. Box girder, 2. Embedded steel bar, 3. Frame, 4. Lower guardrail, 5. Tilting frame, 8. Limiting clip, 7. Positioning block, 6. Upper guardrail, 31. Base plate, 32. Upright, 33. Connector, 34. Pull rope, 35. Reinforcing rib, 36. Turnbuckle. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0023] Example:

[0024] Reference Figure 1This embodiment provides a bridge deck edge folding guardrail for construction. It includes a box girder 1; embedded reinforcing bars 2 are provided at the bridge deck edge of the top of the box girder 1; at least two vertically placed supports 3 are provided in the gaps between the embedded reinforcing bars 2; in this embodiment, a total of three supports are provided; the supports 3 are arranged along the length of the box girder 1; a grid-like lower guardrail 4 is provided between the supports 3; a flipping frame 5 is rotatably installed on the top of the two furthest supports 3; an upper guardrail 6 is provided between the two flipping frames 5; a limiting clip 8 is installed between the flipping frame 5 and the supports 3; when the flipping frame 5 flips to directly above the supports 3, the supports 3 can restrict the movement of the flipping frame 5 through the limiting clip 8. The limiting clip 8, in the locked state, can effectively resist accidental impact forces from the inside of the bridge deck. In this embodiment, the number of bridge face edge folding guardrails installed on the box girder can be determined according to the length of the box girder. Each section of the bridge face edge folding guardrail is independent of the others, or they can be connected by connecting rods or other components without affecting the protective effect.

[0025] The support frame 3 includes a base plate 31 placed on the top surface of the box girder; the base plate 31 is secured between the pre-embedded reinforcing bars 2 along the width direction of the box girder 1, and a vertical pole 32 is provided in the middle of the base plate 31; a connector 33 is provided on the upper side of the vertical pole 32; at least two pull ropes 34 are provided on the connector 33; the connector 33 is usually a steel plate welded to the top of the vertical pole, with holes or hooks for connecting the pull ropes 34; in this embodiment, two pull ropes are used; the other end of the pull rope 34 is connected to the pre-embedded reinforcing bars 2, and the two pull ropes are respectively connected to the pre-embedded reinforcing bars on both sides of the support frame. After installation, the pull ropes 34 are in a tensioned state, and together with the base plate 31, they provide lateral stability for the support frame.

[0026] The base plate 31 is an L-shaped plate structure; a reinforcing rib 35 is provided between the base plate 31 and the upright 32; and a turnbuckle 36 for adjusting the tension is provided on the pull rope 34. By rotating the turnbuckle 36, the tension of the pull rope 34 can be precisely adjusted to ensure that the upright 3 remains vertical and stable under various working conditions.

[0027] The lower guardrail 4 is located above the pre-embedded steel bars 2; the lower guardrail 4 includes two or more parallel horizontal bars, and several vertical connecting bars are set between the horizontal bars. The horizontal bars and vertical connecting bars of the lower guardrail are fixed together by welding to form a stable grid frame.

[0028] The upper guardrail 6 includes a horizontal bar; a support rod is provided on the horizontal bar directly opposite the vertical connecting rod or the support frame 3; the support rod is vertically welded to the horizontal bar of the upper guardrail 6 and extends downwards; a matching buckle is provided on the opposite end of the support rod and the vertical connecting rod or the support frame 3. In this embodiment, the buckle is not shown in the illustration, but it can be understood that the function of the buckle is to lock and limit the upper guardrail when the upper guardrail is flipped to be directly above the lower guardrail; it can be a sleeve or other locking structure with similar function.

[0029] Positioning blocks 7 are installed on both the upright frame 3 and the tilting frame 5; each positioning block 7 has a corresponding hinge; the upright frame 3 and the tilting frame 5 are hinged together. The hinge's pivot is horizontally arranged and parallel to the edge of the bridge deck, allowing the tilting frame 5 to rotate around this axis in a vertical plane; the hinge blades are correspondingly connected to the positioning blocks. In this embodiment, the positioning block is a horizontally placed hollow square steel pipe. After tilting is completed, the corresponding positioning blocks on the tilting frame and the upright frame are attached to each other.

[0030] The limiting clip 8 includes hollow tubes installed on two corresponding positioning blocks of the upright frame 3 and the tilting frame 5; the hollow tubes are arranged vertically; the hollow tubes are short sections of thick-walled steel pipes and are vertically welded to the end face of the positioning block 7 facing the outer side of the box girder; a T-pin is detachably installed on the hollow tube of the tilting frame 5; the T-pin consists of a pin rod and a handle, the diameter of the pin rod is slightly smaller than the inner diameter of the hollow tube, and the length is sufficient to pass through the two aligned hollow tubes and protrude; when the tilting frame 5 is tilted to directly above the upright frame 3, the two hollow tubes are coaxial, and the T-pin can pass through the two hollow tubes from top to bottom to complete the locking. After the T-pin passes through the aligned hollow tubes, its own weight and handle structure can prevent accidental dislodgement, forming a reliable vertical locking; when the bridge erecting machine passes through the hole, the T-pin on the upright frame can be removed, and the tilting frame and the upper guardrail can be tilted and folded to the position where the side is in contact with the lower guardrail, so that the bridge erecting machine can pass through, without dismantling the overall guardrail structure. The folding direction is usually rotated inwards towards the bridge deck to facilitate flipping by the operator.

[0031] Protective netting is installed on the upper guardrail 6 and the lower guardrail 4 respectively. The mesh size of the protective netting is smaller than that required by safety regulations; in this embodiment, the protective netting is tied to the upper and lower guardrails with cable ties. The cable ties are spaced apart to ensure that the protective netting covers the inside of the grid structure flatly and taut.

[0032] When using the utility model device in this embodiment, the following process can be followed.

[0033] Initial installation:

[0034] Embed the base plate 31 of the support frame 3 into the gap of the pre-embedded steel bar 2 at the edge of the bridge deck; connect the pull rope 34 to the pre-embedded steel bar 2, and adjust the tension through the turnbuckle 36 to ensure that the support frame 3 is stable and vertical; install and fix the lower guardrail 4 between adjacent support frames 3; hinge the flipping frame 5 to the positioning block 7 at the top of the support frame 3 through the hinge; install and fix the upper guardrail 6 between the flipping frames 5; rotate the flipping frame 5 upward to directly above the support frame 3 so that the hollow tube on the positioning block 7 is aligned; insert the T-pin, pass through the aligned hollow tube, and lock the flipping frame 5; connect and fix the support rod of the upper guardrail 6 to the vertical connecting rod of the lower guardrail 4 or the support frame 3 through the buckle; lay the protective net on the upper guardrail 6 and the lower guardrail 4 respectively, and secure it with cable ties.

[0035] Folding operation (before the bridge erecting machine passes through the hole):

[0036] Release the buckle connection between the top rod of the upper guardrail 6 and the vertical connecting rod or the support frame 3 of the lower guardrail 4; pull out the T-pin locking the flipping frame 5 upwards and keep it safe; hold the flipping frame 5 and rotate it smoothly towards the inside of the bridge deck so that it is parallel and close to the lower guardrail 4; check the folded state to ensure that it will not obstruct the passage of the bridge erecting machine and that the lower guardrail 4 still provides effective protection.

[0037] Unfold the recovery operation (after the bridge erecting machine passes through the hole):

[0038] Hold the tilting frame 5 (usually with the upper guardrail 6) and rotate it smoothly about 90 degrees toward the edge of the bridge deck until it returns to the position directly above the upright 3; ensure that the hollow tubes of the tilting frame 5 and the positioning block 7 on the upright 3 are precisely coaxially aligned; insert the T-pin from top to bottom into the aligned hollow tubes until they are in place, and lock the tilting frame 5; reconnect and fix the support rod of the upper guardrail 6 to the vertical connecting rod of the lower guardrail 4 or the upright 3 using the buckle; check whether the overall guardrail structure is stable and whether the limit clips 8 and the buckles are reliably locked.

Claims

1. A bridge deck edge folding guardrail for construction, comprising a box girder (1); pre-embedded reinforcing bars (2) are provided at the bridge deck edge position at the top of the box girder (1); characterized in that: At least two vertically placed supports (3) are provided in the gap of the pre-embedded steel bars (2); the supports (3) are arranged along the length of the box girder (1); a grid-shaped lower guardrail (4) is provided between the supports (3); a flipping frame (5) is rotatably installed on the top of the two supports (3) that are furthest apart; an upper guardrail (6) is provided between the two flipping frames (5); a limiting clip (8) is installed between the flipping frame (5) and the supports (3); when the flipping frame (5) flips to the top of the supports (3), the supports (3) can restrict the movement of the flipping frame (5) by the limiting clip (8).

2. The bridge edge folding guardrail according to claim 1, characterized in that: The support frame (3) includes a base plate (31) placed on the top surface of the box girder; the base plate (31) is sandwiched between the pre-embedded steel bars (2) along the width direction of the box girder (1), and a pole (32) is provided in the middle of the base plate (31); a connector (33) is provided on the upper side of the pole (32); at least two pull ropes (34) are provided on the connector (33); the other end of the pull rope (34) is connected to the pre-embedded steel bars (2).

3. A bridge edge folding guardrail for construction as described in claim 2, characterized in that: The base plate (31) is an L-plate structure; a reinforcing rib (35) is provided between the base plate (31) and the upright (32); and a turnbuckle (36) for adjusting the tightness is provided on the pull rope (34).

4. A bridge edge folding guardrail for construction as described in claim 1, characterized in that: The lower guardrail (4) is located above the pre-embedded steel bar (2); the lower guardrail (4) includes two or more parallel horizontal bars, and several vertical connecting bars are provided between the horizontal bars.

5. A bridge edge folding guardrail for construction as described in claim 1 or 4, characterized in that: The upper guardrail (6) includes a horizontal bar; a support bar is provided on the horizontal bar at a position directly opposite the vertical connecting bar or the upright (3); and a buckle is provided on the opposite end of the support bar and the vertical connecting bar or the upright (3).

6. A bridge edge folding guardrail for construction as described in claim 1, characterized in that: Positioning blocks (7) are installed on both the upright frame (3) and the flipping frame (5); each of the two positioning blocks (7) is provided with a matching hinge; the upright frame (3) and the flipping frame (5) are hinged together by the hinge.

7. A bridge edge folding guardrail for construction as described in claim 6, characterized in that: The limiting clip (8) includes a hollow tube installed on two corresponding positioning blocks of the upright (3) and the flipping frame (5); the hollow tube is arranged vertically; a T-pin is detachably provided on the hollow tube of the flipping frame (5); when the flipping frame (5) is flipped to directly above the upright (3), the two hollow tubes are coaxial; a T-pin is detachably provided on the hollow tube of the flipping frame.

8. A bridge edge folding guardrail for construction as described in claim 1, characterized in that: Protective nets are installed on the upper guardrail (6) and the lower guardrail (4).

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