A cast-in-place box girder edge protection structure

Abstract

The present invention relates to a cast-in-situ box girder edge protection structure, which is arranged at one end of the load-bearing main beam of the flange plate of the cast-in-situ box girder, and comprises an isolation guardrail arranged at the end of the load-bearing main beam, a support unit arranged on the inner side of the isolation guardrail and connected to the load-bearing main beam, and two adjacent support units are paved with a springboard for workers to step on, and the support height of the support structure is adjustable. By adjusting the support height of the support structure, the springboard can be adjusted to a horizontal state; the present invention can be suitable for cast-in-situ box girders of different sizes and different models by arranging the support structure on the load-bearing main beam, and the support height of the edge aisle can be adjusted. The lower supporting plate of the U-shaped frame at the lower part of the support unit is adjustable, so that the springboard on the edge aisle has high levelness and is safe and firm for workers to step on; an isolation guardrail is arranged on the outer side of the constructed leading edge aisle with adjustable inclination angle, which can prevent workers from falling while increasing the strength of the edge protection structure.

Description

Technical Field

[0001] The invention relates to the field of cast-in-situ box girder construction, in particular to a cast-in-situ box girder edge protection structure. Background Art

[0002] Cast-in-situ box girder bridges, with their lightweight structure, compact height, large span, and adaptability to tight curves, are widely used in road management projects such as highway ramps and urban interchanges. Currently, cast-in-situ box girder construction typically involves erecting a separate row of supports outside the main frame. Pedestrian walkways are rarely provided on top of cast-in-situ box girders, and workers walking along the flange bottom formwork can contaminate, deform, or even damage the formwork, affecting the girder's formation. The flange bottom formwork also has a certain slope, posing a safety risk when workers step on it.

[0003] Chinese patent document CN112813847A discloses a cast-in-place box girder edge protection structure and construction method, comprising a load-bearing beam and a cantilever formwork. The cantilever formwork is located on both sides of the load-bearing beam, and a number of vertical support rods and diagonal support rods are provided between the cantilever formwork and the load-bearing beam. The cantilever formwork is provided with a guardrail structure, and the guardrail structure includes a flange formwork connected to the cantilever formwork, and a number of railings are provided on the flange formwork, with a connecting square timber provided every several railings. The above structure fully utilizes the cantilever structure support as the bearing structure of the guardrail, and is combined with the construction of the cast-in-place box girder, integrating the guardrail protection structure with the overall construction of the cast-in-place box girder into one. The guardrail structure is supported by cantilevers only on the top surface of the cast-in-place box girder. After the guardrail is impacted, its own structure offsets each other, and there is no horizontal force on the lower support, which improves safety. The above structure still does not solve the problem of workers not having a dedicated passage on the cast-in-place box girder. Summary of the Invention

[0004] The present invention provides a cast-in-situ box girder edge protection structure. This structure features an isolation guardrail installed outside the load-bearing main beam of the cast-in-situ box girder flange. An adjustable support structure is provided between the isolation guardrail and the flange to control the support height of the edge walkway, thereby resolving the problem of uneven inclination of existing edge walkways. To achieve this objective, the present invention provides the following specific technical solutions:

[0005] A cast-in-situ box girder edge protection structure is arranged at one end of the load-bearing main beam below the flange plate of the cast-in-situ box girder, including an isolation guardrail arranged at the end of the load-bearing main beam, and a support unit arranged on the inner side of the isolation guardrail and connected to the load-bearing main beam. A springboard for workers to step on is laid on two adjacent support units, and the support height of the support unit is adjustable. By adjusting the support height of the support unit, the springboard can be adjusted to a horizontal state.

[0006] Furthermore, the support unit includes a clamping frame and a support plate installed on the clamping frame through a height adjustment component; the clamping frame includes a U-shaped frame and a clamping plate, and the U-shaped frame is composed of a cross bar at the bottom and columns located at both ends of the cross bar; the clamping plate is installed on two columns, and the clamping plate and the U-shaped frame below it together form a clamping space for clamping and fixing the load-bearing main beam, and a springboard for workers to step on is laid on the support plate.

[0007] Furthermore, the upper middle portion of the column is a threaded rod, and the two columns above the clamping plate are both provided with a first nut, and the clamping height of the clamping plate is adjusted by the first nut.

[0008] Furthermore, the support plate is sleeved on the upper part of the two columns, and the height adjustment component is a second nut installed on the two columns at the bottom of the support plate through threaded fitting; the height of the support plate on each support unit is adjusted by screwing the second nut.

[0009] Furthermore, the support plate and the springboard are fixed to each other.

[0010] Furthermore, the isolation guardrail includes vertical poles and diagonal support poles, and the upper ends of the vertical poles and the diagonal support poles are fixed to each other by a first rotating fastener.

[0011] Furthermore, the lower ends of the vertical poles and the diagonal struts are fixed to the load-bearing main beam via connecting pieces.

[0012] Furthermore, it also includes fixing bolts. The connecting piece is sleeved on the load-bearing main beam. The load-bearing main beam is provided with bolt fixing holes. The connecting piece is provided with several fixing holes corresponding to the bolt fixing holes. The fixing bolts pass through the connecting piece and the load-bearing main beam to fix the two.

[0013] Furthermore, a fixing rod is provided at the upper end of the connecting member, and the fixing rod and the vertical rod or the diagonal support rod are fixed to each other through a second rotating fastener.

[0014] Furthermore, a guardrail is provided between two adjacent upright poles.

[0015] The beneficial effects of the above scheme are: support units and isolation guardrails are arranged in sequence from the inside to the outside on the flange plate load-bearing main beam of the cast-in-place box girder, the inclination angle of the support unit can be adjusted, and a springboard for workers to step on is set on the support unit, and an edge aisle with adjustable inclination angle is spliced ​​by the springboard. Different types of cast-in-place box girders have different inclination angles of flange plates, and the inclination angles and sizes of the load-bearing main beams are different, and the process of building the edge aisle is cumbersome; by arranging a support unit with adjustable inclination angle on the load-bearing main beam, the support height of the edge aisle can be adjusted, and the height of the lower supporting plate of the U-shaped frame at the bottom of the support unit is adjustable, which is suitable for different types of cast-in-place box girders.

[0016] In addition, an isolation guardrail is installed on the outside of the constructed leading edge aisle with adjustable inclination. The isolation guardrail forms a barrier on the outside of the edge aisle, which can prevent workers from falling and also increases the structural strength of the edge aisle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the installation structure of the main load-bearing beam and the support unit of the present invention;

[0018] Figure 2 This is a schematic diagram of the installation structure of the clamping frame, the clamping plate, the support plate, the first nut, and the second nut of the present invention;

[0019] Figure 3 This is a schematic diagram of the installation structure of the support unit, springboard, and load-bearing main beam of the present invention;

[0020] Figure 4 This is a schematic diagram of the explosion structure of the isolation guardrail connected to the present invention;

[0021] Figure 5 This is a structural schematic diagram of the cast-in-situ box girder edge protection structure of the present invention installed on the box girder;

[0022] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0023] 1-Load-bearing main beam; 10-Through hole; 2-Isolation guardrail; 20-Connector; 201-Fixed rod; 21-Vertical rod; 22-Diagonal support rod; 23-First rotating fastener; 24-Second rotating fastener; 25-Fixed bolt; 3-Support unit; 30-Clamping frame; 301-U-shaped frame; 302-Clamping plate; 31-Support plate; 32-Vertical column; 33-First nut; 34-Second nut; 4-Springboard. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0026] In order to better explain the purpose, structure and function of the present invention, a cast box girder edge protection structure of the present invention is further described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 and Figure 2As shown, the cast-in-situ box girder edge protection structure of the present invention is arranged on one side of the cast-in-situ box girder flange plate load-bearing main beam 1, an isolation guardrail 2 is arranged on the outside of the load-bearing main beam 1, and at least two support units 3 are fixedly arranged on the load-bearing main beam 1 adjacent to the isolation guardrail 2. A springboard 4 for workers to step on is laid on the support unit 3. The springboard 4 can be controlled to be in a horizontal state by adjusting the support height of the support unit 3, avoiding the direct installation of the springboard 4 on the load-bearing main beam 1, ensuring the horizontality of the springboard 4, and making it more stable and safer for workers to step on the springboard 4.

[0028] In the prior art, the load-bearing main beam 1 extends obliquely upward to the outside of the cast-in-situ box beam flange plate. When the springboard 4 is laid directly on the load-bearing main beam 1, the springboard 4 as a whole will also appear to be lower on the side close to the box beam than on the side away from the box beam. The springboard 4 is in an inclined state, and it is unstable when the operator steps on the springboard 4. Figure 2 , Attachment Figure 3 In the present invention, the support unit 3 includes a holding frame 30 and a support plate 31 installed on the clamping frame through a height adjustment component; the clamping frame 30 includes a U-shaped frame 301 and a clamping plate 302, and the U-shaped frame 301 is composed of a cross bar at the bottom and columns 32 located at both ends of the cross bar; the clamping plate 302 is installed on two columns 32, and the clamping plate 302 and the U-shaped frame 301 below it form a clamping space for clamping and fixing the load-bearing main beam 1.

[0029] In some embodiments, the upper middle portion of the column 32 is a threaded rod, and the two columns 32 above the clamping plate 302 are provided with a first nut 33. The height of the clamping plate 302 is adjusted by the first nut 33, thereby adjusting the size of the clamping space to adapt to load-bearing main beams 1 of different sizes.

[0030] In some embodiments, the support plate 31 is mounted on the upper part of the two columns 32, and the height adjustment component is a second nut 34 installed on the two columns at the bottom of the support plate 31 through threaded cooperation; by screwing the second nut 34, the height of the support plate 31 on each support unit 3 is adjusted, thereby adjusting the height of the two ends of the springboard 4, so that the springboard 4 remains level, which is convenient for workers to construct.

[0031] The adjusting structure of the adjusting member combined with the vertical pole may be an adjusting structure of a screw and a nut, or a clamp and a protrusion, etc., as long as the horizontality of the supporting structure can be adjusted.

[0032] In some embodiments, as shown in the attached Figure 3 , Attachment Figure 5The isolation guardrail 2 shown in the figure includes a vertical pole 21 and a diagonal strut 22. The upper ends of the vertical pole 21 and the diagonal strut 22 are fixed to each other by a first rotating fastener 23. The lower ends of the vertical pole 21 and the diagonal strut 22 are fixed to the load-bearing main beam 1 through a connecting piece 20. A horizontal railing is fixedly connected between two adjacent vertical poles 21, which can provide a safety protection fence for the edge aisle assembled by the springboard 4 to prevent workers from falling.

[0033] The use process of the cast-in-situ box beam edge protection structure of the present invention is as follows: Figure 1 , Attachment Figure 2 , Attachment Figure 3 As shown, several groups of through holes 10 are opened on the wooden square on the outer side of the load-bearing main beam 1, and two connecting members 20 are put on the appropriate positions of the ends of the load-bearing main beam 1 and fixed with bolts, and the vertical pole 21 and the diagonal strut 22 are fixed to the fixed rod 201 on the upper part of the connecting member 20 with the second rotating fastener 24, and then the upper ends of the vertical pole 21 and the diagonal strut 22 are fixed to each other with the first rotating fastener 23; then two clamping frames 30 are put on the load-bearing main beam 1 on the inner side of the vertical pole 21, and the first nut 33 can adjust the distance between the clamping plate 302 and the U-shaped frame 301, which can be suitable for different models of load-bearing main beams 1; then the second nut 34 and the support plate 31 are put on the upper part of the column 32 from bottom to top, and the height of the support plate 31 on each support unit 3 is adjusted by screwing the second nut 34 to ensure that the support plate 31 is level.

[0034] The above description is only a preferred embodiment of the present invention and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A cast-in-situ box girder edge protection structure, arranged at one end of a load-bearing main beam (1) below a flange plate of the cast-in-situ box girder, comprising an isolation guardrail (2) arranged at the end of the load-bearing main beam (1), and a support unit (3) arranged on the inner side of the isolation guardrail (2) and connected to the load-bearing main beam (1), characterized in that: A springboard (4) for workers to step on is laid on two adjacent support units (3), and the support height of the support unit (3) is adjustable. By adjusting the support height of the support unit (3), the springboard (4) is adjusted to a horizontal state; the support unit (3) includes a clamping frame (30) and a support plate (31) mounted on the clamping frame (30) through a height adjustment component; the clamping frame (30) includes a U-shaped frame (301) and a clamping plate (302), and the U-shaped frame (301) is composed of a cross bar at the bottom and columns (32) located at both ends of the cross bar; the clamping plate (302) is mounted on the two columns (32), and the clamping plate (302) and the U-shaped frame (301) below it together form a clamping space for clamping and fixing the load-bearing main beam (1), and the springboard (4) for workers to step on is laid on the support plate (31).

2. The cast-in-situ box girder edge protection structure according to claim 1, characterized in that: The upper middle portion of the column (32) is a threaded rod, and the two columns (32) above the clamping plate (302) are both provided with a first nut (33), and the clamping height of the clamping plate (302) is adjusted by the first nut (33).

3. The cast-in-situ box girder edge protection structure according to claim 2, characterized in that: The support plate (31) is sleeved on the upper parts of the two upright posts (32), and the height adjustment component is a second nut (34) mounted on the two upright posts (32) at the bottom of the support plate (31) through threaded engagement; the height of the support plate (31) on each support unit (3) is adjusted by screwing the second nut.

4. The cast-in-situ box girder edge protection structure according to claim 3, characterized in that: The support plate (31) and the springboard (4) are fixed to each other.

5. The cast-in-situ box girder edge protection structure according to claim 1, characterized in that: The isolation guardrail (2) comprises a vertical rod (21) and an oblique support rod (22), and the upper ends of the vertical rod (21) and the oblique support rod (22) are fixed to each other by a first rotating fastener (23).

6. The cast-in-situ box girder edge protection structure according to claim 5, characterized in that: The lower ends of the vertical poles (21) and the oblique support poles (22) are fixed to the load-bearing main beam (1) via connecting pieces (20).

7. The cast-in-situ box girder edge protection structure according to claim 6, characterized in that: It also includes fixing bolts (25), the connecting member (20) is sleeved on the load-bearing main beam (1), the load-bearing main beam (1) is provided with bolt fixing holes, and the connecting member (20) is provided with a plurality of fixing holes corresponding to the bolt fixing holes, and the fixing bolts (25) penetrate the connecting member (20) and the load-bearing main beam (1) to fix the two.

8. The cast-in-situ box girder edge protection structure according to claim 7, characterized in that: A fixing rod (201) is provided at the upper end of the connecting member (20), and the fixing rod (201) and the vertical rod (21) or the oblique support rod (22) are fixed to each other via a second rotating fastener (24).

9. The cast-in-situ box girder edge protection structure according to any one of claims 5 to 8, characterized in that: A guardrail is provided between two adjacent upright poles (21).

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