Prefabricated central crash barrier structure with reserved bottom cast-in-place section

Abstract

The utility model discloses a prefabricated central crash barrier structure of reserving bottom cast-in-place section, including beam body, first reinforced frame, prefabricated body, second reinforced frame and cast-in-place pedestal, the first reinforced frame is embedded on the beam body, and the first reinforced frame exposes the beam body upwards, the prefabricated body is erected in the just above of beam body, and the bottom of prefabricated body and beam body form the pedestal space, the first reinforced frame stretches into the pedestal space, and the prefabricated body is provided with the pressure grouting hole, and the pressure grouting hole is communicated with the pedestal space, through forming the pedestal space between the bottom of prefabricated body and beam body, and cooperating cast-in-place pedestal to form through pouring concrete in the pedestal space again, and the first reinforced frame and second reinforced frame all bury in cast-in-place pedestal, can realize factory prefabrication, and it is simple in structure, high in strength, good in crash -resistant capacity, and low in precision requirement, can be hoisted fast on the spot, greatly speeds up construction progress, can widely use.

Description

Technical Field

[0001] This utility model relates to the field of crash barriers, and in particular to a prefabricated central crash barrier structure with a reserved bottom cast-in-place section. Background Technology

[0002] A central crash barrier, typically installed in the middle of a road, is a road safety feature used to separate oncoming traffic flows or as a safety protection device. Its primary purpose is to prevent out-of-control vehicles from crossing the median and entering the opposite lane, thus protecting oncoming vehicles and pedestrians from injury. It also reduces the occurrence of head-on collisions, improving road safety and traffic efficiency. Central crash barriers are usually made of steel, concrete, or other high-strength materials, possessing sufficient rigidity and toughness to withstand vehicle impacts. Their design takes into account the impact force and direction of the vehicle to ensure that it can guide the vehicle back to the correct direction upon impact, while minimizing damage to the barrier and the vehicle.

[0003] Currently, central crash barriers on urban roads and highways are mostly constructed using monolithic cast-in-place concrete. While this method offers the advantage of reliable anchoring, it suffers from long construction periods, requires numerous formwork templates, and has low construction efficiency. Furthermore, it involves working at heights on bridges, posing safety hazards. Existing prefabricated crash barriers use bolts and steel structure connections, which suffer from weak impact resistance, complex construction, or complicated processing of pre-reserved connection slots. These methods are difficult to construct, require high precision, and are challenging to apply in practice, impacting the progress of bridge deck paving. Therefore, improvements are needed to the current central crash barriers. Summary of the Invention

[0004] In view of this, the present invention addresses the deficiencies of the existing technology and its main purpose is to provide a prefabricated central crash barrier structure with a reserved bottom cast-in-place section, which can effectively solve the problems of long construction period, high construction difficulty, high precision requirements and low construction efficiency of the existing central crash barrier.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A precast central crash barrier structure with a reserved bottom cast-in-place section includes a beam, a first reinforcing steel frame, a precast body, a second reinforcing steel frame, and a cast-in-place base. The first reinforcing steel frame is embedded in the beam and protrudes upward from the beam. The precast body is erected directly above the beam, and a base space is formed between the bottom of the precast body and the beam. The first reinforcing steel frame extends into the base space, and grouting holes are provided on the precast body, communicating with the base space. The second reinforcing steel frame is embedded in the precast body and extends downward into the base space, and is fixedly connected to the first reinforcing steel frame. The cast-in-place base is formed by secondary pouring of concrete into the base space, and is fixedly connected between the beam and the precast body. Both the first and second reinforcing steel frames are embedded in the cast-in-place base.

[0007] Preferably, the first steel reinforcement frame includes a first stirrup and a plurality of first longitudinal steel bars. A portion of the first stirrup is embedded in the beam body, and another portion of the first stirrup is embedded in the cast-in-place base. The plurality of first longitudinal steel bars are fixedly connected to the first stirrup and embedded in the beam body. The second steel reinforcement frame includes a second stirrup and a plurality of second longitudinal steel bars. A portion of the second stirrup is embedded in the precast body, and another portion of the second stirrup is embedded in the cast-in-place base. The second stirrup is fixedly connected to the first stirrup, and the plurality of second longitudinal steel bars are fixedly connected to the second stirrup and embedded in the precast body.

[0008] Preferably, the U-shaped steel bar of the first stirrup and the U-shaped steel bar of the second stirrup form a snap fastener, and a third longitudinal steel bar is inserted into the snap fastener. The third longitudinal steel bar is embedded in the cast-in-place base and fixes the first stirrup and the second stirrup together.

[0009] Preferably, there are multiple first stirrups, which are arranged longitudinally at intervals, with a spacing of 100-200 mm between adjacent first stirrups.

[0010] Preferably, there are multiple second stirrups, which are arranged longitudinally at intervals, with a spacing of 100-200 mm between adjacent second stirrups.

[0011] Preferably, the longitudinal length of the precast body is 3 to 5 m, and the grouting hole is located at the top middle position of the precast body, and the grouting hole extends vertically downward to the base space.

[0012] Preferably, the concrete is non-shrink fine aggregate concrete.

[0013] Preferably, the beam body includes a main beam top plate, a reinforced concrete layer, a waterproof layer, and an asphalt concrete layer; the cast-in-place base rests on the main beam top plate, the first steel reinforcement frame is embedded in the main beam top plate, the reinforced concrete layer is laid on the surface of the main beam top plate and located around the cast-in-place base, the waterproof layer is laid on the surface of the reinforced concrete layer and located around the cast-in-place base, and the asphalt concrete layer is laid on the surface of the waterproof layer and located around the cast-in-place base.

[0014] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution:

[0015] By forming a base space between the bottom of the precast body and the beam, and then forming a cast-in-place base by pouring concrete into the base space a second time, and with the first and second steel reinforcement frames both embedded in the cast-in-place base, factory prefabrication can be achieved. Its structure is simple, strong, and has good impact resistance. It also has low precision requirements and can be quickly hoisted on site, greatly accelerating the construction progress. It can be widely promoted and used.

[0016] To more clearly illustrate the structural features and effects of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments: Attached Figure Description

[0017] Figure 1 This is a front view of a preferred embodiment of the present invention;

[0018] Figure 2 This is a top view of a preferred embodiment of the present invention;

[0019] Figure 3 This is a side view of a preferred embodiment of the present invention;

[0020] Figure 4 This is a cross-sectional view of a preferred embodiment of the present invention.

[0021] Figure 5 This is a side view of the beam with a first steel reinforcement frame pre-embedded in a preferred embodiment of the present invention;

[0022] Figure 6 This is a side view of a beam with a prefabricated body embedded in it, according to a preferred embodiment of the present invention.

[0023] Explanation of reference numerals in the attached diagram:

[0024] 10. Beam body; 11. Main beam top slab

[0025] 12. Reinforced concrete layer 13. Waterproof layer

[0026] 14. Asphalt concrete layer; 20. First steel reinforcement frame

[0027] 21. First stirrup; 22. First longitudinal reinforcement.

[0028] 30. Precast body; 31. Grouting hole

[0029] 40. Second steel reinforcement frame; 41. Second stirrup.

[0030] 42. Second longitudinal reinforcement 50. Cast-in-place base

[0031] 101. Base space; 102. Third longitudinal reinforcement bar Detailed Implementation

[0032] Please refer to Figures 1 to 6 As shown, it illustrates the specific structure of a preferred embodiment of the present invention, including a beam 10, a first steel reinforcement frame 20, a precast body 30, a second steel reinforcement frame 40, and a cast-in-place base 50.

[0033] The beam 10 includes a main beam top slab 11, a reinforced concrete layer 12, a waterproof layer 13, and an asphalt concrete layer 14; the reinforced concrete layer 12 is laid on the surface of the main beam top slab 11, the waterproof layer 13 is laid on the surface of the reinforced concrete layer 12, and the asphalt concrete layer 14 is laid on the surface of the waterproof layer 13.

[0034] The first reinforcing steel frame 20 is embedded in the beam 10, protruding upwards from the beam 10. Specifically, the first reinforcing steel frame 20 includes a first stirrup 21 and a plurality of first longitudinal reinforcing bars 22. A portion of the first stirrup 21 is embedded within the beam 10, and the plurality of first longitudinal reinforcing bars 22 are fixedly connected to the first stirrup 21 and embedded within the beam 10. In this embodiment, the first reinforcing steel frame 20 is embedded in the top slab 11 of the main beam, and there are multiple first stirrups 21 arranged longitudinally at intervals, with a spacing of 100–200 mm between adjacent first stirrups 21.

[0035] The precast body 30 is erected directly above the beam 10. A base space 101 is formed between the bottom of the precast body 30 and the beam 10. The first reinforcing steel frame 20 extends into the base space 101, and a grouting hole 31 is provided on the precast body 30, which communicates with the base space 101. In this embodiment, the longitudinal length of the precast body 30 is 3-5m. The grouting hole 31 is located at the top center of the precast body 30, and it extends vertically downwards into the base space 101. The inner diameter of the grouting hole 31 is large enough to also serve as a vent, facilitating secondary concrete pouring.

[0036] The second reinforcing bar frame 40 is embedded in the precast body 30 and extends downward into the base space 101. The second reinforcing bar frame 40 is fixedly connected to the first reinforcing bar frame 20. Specifically, the second reinforcing bar frame 40 includes second stirrups 41 and multiple second longitudinal reinforcing bars 42. A portion of the second stirrups 41 is embedded in the precast body 30, and the second stirrups 41 are fixedly connected to the first stirrups 21. The multiple second longitudinal reinforcing bars 42 are fixedly connected to the second stirrups 41 and embedded in the precast body 30. Furthermore, there are multiple second stirrups 41, arranged longitudinally at intervals, with a spacing of 100–200 mm between adjacent second stirrups 41.

[0037] The cast-in-place base 50 is formed by secondary pouring of concrete into the base space 101. The cast-in-place base 50 is fixedly connected between the beam 10 and the precast body 30, and both the first reinforcing bar frame 20 and the second reinforcing bar frame 40 are embedded within the cast-in-place base 50. In this embodiment, another portion of the first stirrup 21 and another portion of the second stirrup 41 are embedded within the cast-in-place base 50. Furthermore, the U-shaped reinforcing bars of the first stirrup 21 and the second stirrup 41 form a snap-fit, and a third longitudinal reinforcing bar 102 is inserted into the snap-fit. The third longitudinal reinforcing bar 102 is embedded within the cast-in-place base 50, and it fixes the first stirrup 21 and the second stirrup 41 together to enhance the anchorage force. Additionally, the concrete is non-shrink fine-aggregate concrete, and its grade is one grade higher than that of the precast body 30. In addition, the cast-in-place base 50 rests on the top plate 11 of the main beam, the reinforced concrete layer 12 is located on the periphery of the cast-in-place base 50, the waterproof layer 13 is located on the periphery of the cast-in-place base 50, and the asphalt concrete layer 14 is located on the periphery of the cast-in-place base 50.

[0038] The manufacturing and construction process of this embodiment is described in detail below:

[0039] First, the second steel reinforcement frame 40 is fabricated in the factory, and the precast body 30 is precast using concrete. The precast body 30 is then tied and fixed together with the second steel reinforcement frame 40. Next, the precast body 30 is hoisted to the construction site. The main beam top plate 11 is pre-prepared at the construction site, and the first steel reinforcement frame 20 is embedded in the main beam top plate 11. After the precast body 30 is hoisted and placed on the main beam top plate 11, the first steel reinforcement frame 20 and the second steel reinforcement frame 40 are snapped together and connected and fixed together using the third longitudinal steel reinforcement 102. Then, non-shrink fine aggregate concrete is pressed into the base space 101 through the grouting hole 31. The grade of the concrete to be poured should be one grade higher than that of the concrete of the precast body 30 to form the cast-in-place base 50 and form a whole. Finally, the reinforced concrete layer 12, the waterproof layer 13, and the asphalt concrete layer 14 are laid in sequence.

[0040] The key design feature of this utility model is that a base space is formed between the bottom of the precast body and the beam, and a cast-in-place base is formed by secondary pouring of concrete into the base space. The first and second steel reinforcement frames are both embedded in the cast-in-place base. This allows for factory prefabrication, resulting in a simple structure with high strength, good impact resistance, low precision requirements, and rapid on-site hoisting, which greatly accelerates the construction progress and can be widely promoted and used.

[0041] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A precast central crash barrier structure with a reserved bottom cast-in-place section, characterized in that: The system includes a beam, a first reinforcing steel frame, a precast body, a second reinforcing steel frame, and a cast-in-place base. The first reinforcing steel frame is embedded in the beam and protrudes upwards from the beam. The precast body is erected directly above the beam, and a base space is formed between the bottom of the precast body and the beam. The first reinforcing steel frame extends into the base space, and grouting holes are provided on the precast body, which communicate with the base space. The second reinforcing steel frame is embedded in the precast body and extends downwards into the base space, and is fixedly connected to the first reinforcing steel frame. The cast-in-place base is formed by secondary pouring of concrete into the base space. The cast-in-place base is fixedly connected between the beam and the precast body, and both the first and second reinforcing steel frames are embedded within the cast-in-place base.

2. The precast central crash barrier structure with a reserved bottom cast-in-place section as described in claim 1, characterized in that: The first steel reinforcement frame includes a first stirrup and a plurality of first longitudinal steel bars. A portion of the first stirrup is embedded in the beam body, and another portion of the first stirrup is embedded in the cast-in-place base. The plurality of first longitudinal steel bars are fixedly connected to the first stirrup and embedded in the beam body. The second steel reinforcement frame includes a second stirrup and a plurality of second longitudinal steel bars. A portion of the second stirrup is embedded in the precast body, and another portion of the second stirrup is embedded in the cast-in-place base. The second stirrup is fixedly connected to the first stirrup. The plurality of second longitudinal steel bars are fixedly connected to the second stirrup and embedded in the precast body.

3. A precast central crash barrier structure with a reserved bottom cast-in-place section as described in claim 2, characterized in that: The U-shaped steel bar of the first stirrup and the U-shaped steel bar of the second stirrup form a snap, and a third longitudinal steel bar is inserted into the snap. The third longitudinal steel bar is embedded in the cast-in-place base and fixes the first stirrup and the second stirrup together.

4. A precast central crash barrier structure with a reserved bottom cast-in-place section as described in claim 2, characterized in that: There are multiple first stirrups, which are arranged longitudinally at intervals, with a spacing of 100-200mm between adjacent first stirrups.

5. A precast central crash barrier structure with a reserved bottom cast-in-place section as described in claim 2, characterized in that: There are multiple second stirrups, which are arranged longitudinally at intervals, with a spacing of 100-200mm between adjacent second stirrups.

6. A precast central crash barrier structure with a reserved bottom cast-in-place section as described in claim 1, characterized in that: The longitudinal length of the precast body is 3 to 5 m. The grouting hole is located at the top middle position of the precast body and extends vertically downwards into the base space.

7. A precast central crash barrier structure with a reserved bottom cast-in-place section as described in claim 1, characterized in that: The concrete is non-shrink fine aggregate concrete.

8. A precast central crash barrier structure with a reserved bottom cast-in-place section as described in claim 1, characterized in that: The beam body includes a main beam top slab, a reinforced concrete layer, a waterproof layer, and an asphalt concrete layer; the cast-in-place base rests on the main beam top slab, the first steel reinforcement frame is embedded in the main beam top slab, the reinforced concrete layer is laid on the surface of the main beam top slab and located around the cast-in-place base, the waterproof layer is laid on the surface of the reinforced concrete layer and located around the cast-in-place base, and the asphalt concrete layer is laid on the surface of the waterproof layer and located around the cast-in-place base.

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