An assembled concrete guardrail design and construction method using PBL connectors

Abstract

The application relates to the technical field of bridge engineering and discloses a design and construction method of an assembled concrete guardrail adopting a PBL connecting piece. The assembled concrete guardrail adopting the PBL connecting piece comprises a prefabricated concrete guardrail, a beam body and a PBL connecting piece. The prefabricated concrete guardrail is installed on the left and right sides of the beam body and comprises a concrete guardrail body and a connecting seat. The outer side of the connecting seat is provided with an inwardly recessed embedding groove. The left and right side flange edges of the beam body are provided with concrete convex tooth blocks capable of being matched with the embedding groove. A plurality of PBL connecting pieces are pre-buried along the bridge direction of the beam body. The prefabricated concrete guardrail, the beam body and the PBL connecting piece are connected through high-strength friction type bolts. The assembled concrete guardrail adopting the PBL connecting piece solves the problem of the connection reliability of the prefabricated assembled guardrail and the beam body, can obviously accelerate the construction speed of the guardrail, guarantees the construction quality, ensures that the anti-collision performance of the guardrail meets the expected requirements, facilitates the transportation and hoisting of the prefabricated components and is favorable for the improvement of the economic benefits of the prefabricated assembled guardrail.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and in particular to a design and construction method for prefabricated concrete guardrails using PBL connectors. Background Technology

[0002] Constructing bridges using traditional on-site casting methods faces numerous challenges in terms of construction speed, quality, and material transportation, while also potentially impacting the surrounding natural environment. To address these issues, precast bridge structure systems have emerged and are increasingly being applied in modern bridge engineering.

[0003] However, due to limitations in hoisting technology, excessively long standard hoisting sections can easily lead to cracking of the guardrail during installation, affecting construction quality. The standard recommends a standard section length of 4-6 meters for prefabricated guardrails. This length is shorter than the recommended length for cast-in-place guardrails, resulting in poorer overall integrity and inherent disadvantages in overturning resistance and impact resistance.

[0004] The development of prefabricated guardrails inevitably places higher demands on their design and construction. Prefabricated guardrails need to be connected to bridges in various ways, and the reliability of these connectors determines the overall reliability of the crash barrier. Precise and complex calculations are required during the design process to ensure the safety of the prefabricated guardrails. Furthermore, since the various components of prefabricated guardrails need to be precisely installed on-site, the accurate layout of each embedded part is crucial. Any deviations during installation will affect the crashworthiness and appearance of the guardrail, thus increasing the demands on the skills of construction personnel and the precision and stability of construction equipment.

[0005] In general, during the hoisting and installation of prefabricated concrete crash barriers, appropriate and reliable connectors and connection methods (vertical connections) must be used to connect the standard sections of the barrier to the bridge structure as a whole. This connection with the bridge deck provides the barrier system with a certain degree of resistance to overturning. Simultaneously, longitudinal connections are needed to link two consecutive standard sections of the barrier into a single unit, enhancing the overall integrity and stability of the barrier. Superior vertical connections can meet the practical functional requirements of the structure while adapting to the convenience demands of prefabricated construction. In the event of a collision, the connectors must have sufficient strength to withstand the impact load on the barrier structure, while also enabling rapid installation. Different lengths and protection levels of the barrier place different demands on the required connection methods; suitable connections not only meet safety requirements but also adhere to the principle of economic efficiency. Summary of the Invention

[0006] To address the problems mentioned in the background art regarding the vertical connection between prefabricated crash barriers and bridges, this invention proposes a design and construction method for prefabricated concrete guardrails using PBL connectors. Prefabricated concrete guardrails using PBL connectors can ensure connection strength and stability, are easy to construct, and have high installation efficiency.

[0007] The technical solution adopted in this invention is as follows:

[0008] An assembled concrete guardrail using PBL connectors, comprising a precast concrete guardrail, a beam, and PBL connectors.

[0009] The precast concrete guardrail is installed on the left and right sides of the beam, and includes an upper concrete guardrail body and a lower connecting seat that connects to the beam; the outer side of the connecting seat is provided with an inwardly recessed fixing groove.

[0010] The left and right flange edges of the beam are provided with upward-protruding concrete tooth blocks that can cooperate with the embedding groove. Several PBL connectors are pre-embedded in the beam along the bridge direction at the inner edge of the connecting seat.

[0011] The precast concrete guardrails, beams, and PBL connectors are connected by high-strength friction bolts that pass through the concrete toothed blocks, connecting seats, and PBL connectors in sequence, so that several precast concrete guardrails are installed on the left and right sides of the beams along the bridge direction.

[0012] Furthermore, the upper concrete guardrail body and the lower connecting seat of the precast concrete guardrail are reinforced concrete structures with steel bars and formwork for concrete pouring. Bolt connection holes need to be reserved before pouring concrete. Before pouring concrete, several guardrail embedded steel plates are pre-embedded on the side of the connecting seat and the PBL connector.

[0013] Furthermore, the steel plate embedded in the guardrail is welded to the reinforcing steel bars inside the precast concrete guardrail.

[0014] Furthermore, the concrete protruding tooth block is a reinforced concrete structure that is poured with concrete using steel bars and formwork.

[0015] Furthermore, the PBL connector includes a PBL connector embedded steel plate, a PBL connector perforated plate, a PBL connector embedded reinforcing bar, and a PBL connector connecting steel plate;

[0016] The bottom of the PBL connector embedded steel plate is welded to the PBL connector perforated plate. The PBL connector embedded steel bar passes through the through hole on the PBL connector perforated plate. The PBL connector embedded steel plate, the PBL connector perforated plate and the PBL connector embedded steel bar are all located in the beam body, and the top surface of the PBL connector embedded steel plate is on the same horizontal plane as the upper surface of the beam body.

[0017] The upper part of the embedded steel plate of the PBL connector is welded to the connecting steel plate of the PBL connector, and the connecting steel plate of the PBL connector is provided with through holes for high-strength friction bolts to pass through.

[0018] Furthermore, the perforated plate of the PBL connector is arranged along the left and right direction of the beam, and the pre-embedded steel bars of the PBL connector are arranged along the direction of the bridge; or the perforated plate of the PBL connector is arranged along the direction of the bridge, and the pre-embedded steel bars of the PBL connector are arranged along the left and right direction of the beam.

[0019] A design method for prefabricated concrete guardrails, specifically for the aforementioned prefabricated concrete guardrails using PBL connectors, includes the following steps:

[0020] Step 1: Determine the guardrail grade and design load based on the required collision protection level;

[0021] Step 2: Design PBL connectors and high-strength friction bolt connectors; calculate the load design values ​​of PBL connectors and high-strength friction bolts based on the design load, design the PBL shear key structure and determine the size and model of the high-strength friction bolts according to the relevant specifications;

[0022] Step 3: Design the reinforcement of the concrete toothed blocks;

[0023] Step four: Supplement the structural requirements for the prefabricated guardrail according to the specifications, including: the hole diameter, spacing, and edge distance of the high-strength friction bolt holes, the grade and preload of the high-strength friction bolts, the anti-slip coefficient of the friction surface of the high-strength friction bolt connection, and the hole size requirements of the PBL connector plate.

[0024] Furthermore, step two includes the following steps in the design of PBL connectors and high-strength friction bolt connectors:

[0025] First, determine the design value N of the load on the connectors based on the height of the prefabricated guardrail;

[0026] Secondly, the shear capacity of the PBL connector is checked using the following formula:

[0027]

[0028]

[0029] In the formula, This refers to the number of PBL connectors per meter. This is the design value of the single-hole shear capacity of the PBL connector; It is the diameter of the opening; It refers to the diameter of the transverse through-bar rebar; It is the design value of the axial tensile strength of concrete; It is the design value of the shear strength of the steel reinforcement; This is the design value for the tensile strength of the reinforcing steel. To increase the coefficient;

[0030] Finally, the high-strength friction bolt connection is verified using the following formula:

[0031]

[0032]

[0033] In the formula, m is the number of high-strength friction bolt connections per meter; This is the design value for the shear bearing capacity of a high-strength friction-type bolted connection; The preload of a high-strength friction-type bolt connection; This represents the number of force-transmitting friction surfaces; denoted as the anti-slip coefficient of the friction surface.

[0034] Furthermore, in step three, the strength verification of the concrete toothed block includes the following steps:

[0035] Assuming the load per meter of guardrail The entire load is borne by the concrete toothed block, and the strength of the concrete toothed block is verified using the following formula:

[0036]

[0037] In the formula, For the shear bearing capacity of concrete toothed blocks; S represents the design value of the tensile strength of ordinary steel bars; S is the cross-sectional area of ​​shear steel bars per meter.

[0038] A construction method for prefabricated concrete guardrails, specifically for the aforementioned prefabricated concrete guardrails using PBL connectors, includes the following steps:

[0039] Step S1: Tie the reinforcing bars of the prefabricated guardrail, beam, and concrete toothed block respectively; embed steel plates in the corresponding positions of the prefabricated guardrail and PBL connectors in the corresponding positions of the beam; and reserve bolt holes in the corresponding positions of the prefabricated guardrail, PBL connectors, and concrete toothed blocks when pouring concrete.

[0040] Step S2: After the prefabricated concrete guardrail and beam using PBL connectors have been cured, assemble the guardrail, ensuring that the reserved bolt holes are aligned; assemble high-strength friction bolts to complete the connection between the prefabricated concrete guardrail and the beam, thus completing the connection between the prefabricated concrete guardrail and the beam using PBL connectors.

[0041] The beneficial effects of this invention are:

[0042] This invention proposes a prefabricated concrete guardrail using PBL connectors, which solves the problem of reliability in the connection between prefabricated guardrails and beams. It can significantly speed up the construction of guardrails, ensure construction quality, ensure that the guardrail's anti-collision performance meets the expected requirements, and facilitate the transportation and hoisting of prefabricated components, thus improving the economic benefits of prefabricated guardrails. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0044] Figure 1 This is a front view of the prefabricated concrete guardrail using PBL connectors according to the present invention.

[0045] Figure 2 This is a side view of the prefabricated concrete guardrail using PBL connectors according to the present invention.

[0046] Figure 3 This is an enlarged schematic diagram of the concrete protruding tooth block and the guardrail fixing groove of the present invention;

[0047] Figure 4 This is a side view of the precast concrete guardrail of the present invention;

[0048] Figure 5 This is a cross-sectional view of the precast concrete guardrail of the present invention;

[0049] Figure 6 This is an enlarged schematic diagram of the connection between the precast concrete guardrail and the pre-embedded PBL connector in the beam according to the present invention;

[0050] Figure 7 and Figure 8 This diagram shows another arrangement of the PBL connectors in the prefabricated concrete guardrail of the present invention.

[0051] In the diagram, 1—precast concrete guardrail, 2—beam, 3—PBL connector, 301—PBL connector embedded steel plate, 32—PBL connector perforated plate, 33—PBL connector embedded reinforcing bar, 34—PBL connector connecting steel plate, 4—high-strength friction bolt connector, 41—high-strength friction bolt, 42—nut, 5—recessed groove, 6—bolt connection hole, 7—guardrail embedded steel plate, 8—reinforcing bar, 9—concrete toothed block. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Example 1

[0054] To address the issues arising from the vertical connection between prefabricated crash barriers and bridge structures, this embodiment provides a prefabricated concrete barrier using PBL connectors. For example... Figure 1 As shown, the prefabricated concrete guardrail using PBL connectors consists of three parts: a precast concrete guardrail 1, a beam 2, and PBL connectors 3.

[0055] Among them, such as Figure 2 As shown, the precast concrete guardrail 1 is installed on the left and right sides of the beam 2. The precast concrete guardrail 1 includes an upper concrete guardrail body and a lower connecting seat that connects to the beam 2; the outer side of the connecting seat of the precast concrete guardrail 1 is provided with an inwardly recessed fixing groove 5. Figure 2 As shown, the left and right flange edges of the beam 2 are provided with upward-protruding concrete toothed blocks 9, which can cooperate with the embedding groove 5 to limit the precast concrete guardrail 1 on one side. Figure 1 and Figure 2 As shown, several PBL connectors 3 are pre-embedded along the bridge direction at the inner edge of the connecting seat of beam 2.

[0056] like Figure 2 and Figure 3As shown, the precast concrete guardrail 1, the beam 2, and the PBL connector 3 are connected by high-strength friction bolts that pass sequentially through the concrete protruding tooth block 9, the connecting seat of the precast concrete guardrail 1, and the PBL connector 3, allowing several precast concrete guardrails 1 to be installed on the left and right sides of the beam 2 along the bridge's orientation. This prefabricated concrete guardrail structure using PBL connectors significantly improves the connection reliability of the guardrails by employing PBL connectors 3, reducing safety hazards caused by improper connections. The prefabricated structure facilitates transportation and hoisting, and can accelerate construction speed while ensuring quality; therefore, it helps to improve the economic benefits of precast prefabricated guardrails.

[0057] Furthermore, the following detailed description is provided for each structure constituting the prefabricated concrete guardrail using PBL connectors:

[0058] Precast concrete guardrail 1: such as Figure 2 , Figure 4 ,and Figure 5 As shown, the upper concrete guardrail body and lower connecting seat of the precast concrete guardrail 1 are reinforced concrete structures constructed by concrete pouring with steel bars and formwork. Bolt connection holes 6 need to be reserved before pouring concrete. Before pouring concrete, several guardrail embedded steel plates 7 are pre-embedded on the side where the connecting seat connects to the PBL connector 3. The guardrail embedded steel plates 7 are welded to the steel bars 8 inside the precast concrete guardrail 1. The guardrail embedded steel plates 7 enhance the stability and load-bearing capacity of the overall structure. At the same time, when configuring the steel bars and formwork, an inwardly recessed embedding groove 5 is reserved according to the design dimensions.

[0059] Beam 2: Beam 2 is a reinforced concrete structure constructed by pouring concrete using steel reinforcement and formwork. Before pouring the concrete for Beam 2, PBL connectors 3 need to be pre-embedded along the bridge's direction. The upward-protruding concrete toothed blocks 9 on the left and right flange edges of Beam 2 are also reinforced concrete structures constructed by pouring concrete using steel reinforcement and formwork.

[0060] PBL connector 3: such as Figure 1 , Figure 2 , Figure 6 As shown, the PBL connector 3 includes a PBL connector embedded steel plate 31, a PBL connector perforated plate 32, a PBL connector embedded reinforcing bar 33, and a PBL connector connecting steel plate 34. The bottom of the PBL connector embedded steel plate 31 is welded to the PBL connector perforated plate 32. The PBL connector embedded reinforcing bar 33 passes through a through hole in the PBL connector perforated plate 32. The PBL connector embedded steel plate 31, the PBL connector perforated plate 32, and the PBL connector embedded reinforcing bar 33 are all located within the beam body 2, and the top surface of the PBL connector embedded steel plate 31 is at the same horizontal plane as the upper surface of the beam body 2.

[0061] In addition, the upper part of the PBL connector embedded steel plate 31 is welded to the PBL connector connecting steel plate 34. The PBL connector connecting steel plate 34 can fit with the guardrail embedded steel plate 7 on the side of the connecting seat of the precast concrete guardrail 1, and the PBL connector connecting steel plate 34 is provided with through holes for high-strength friction bolts to pass through.

[0062] High-strength friction-type bolt connector 4: such as Figure 2 As shown, the high-strength friction bolt connector 4 needs to pass through the concrete toothed block 9, the precast concrete guardrail 1, the guardrail embedded steel plate 7, and the PBL connector connecting steel plate 34. The high-strength friction bolt connector 4 is installed after the precast concrete guardrail 1 is assembled in place. Figure 3 As shown, the high-strength friction bolt connector 4 includes a high-strength friction bolt 41 and a nut 42.

[0063] It should be noted that, in this embodiment, the PBL connector 3 embedded in the beam 2, including the PBL connector perforated plate 32 and the PBL connector embedded steel bar 33, can be arranged in various ways according to the actual construction needs on site; Layout method one: such as Figure 1 , Figure 2 and Figure 6 As shown, the PBL connector with perforated plate 32 is arranged along the left-right direction of beam 2, and the PBL connector with embedded steel bars 33 is arranged along the direction of bridge alignment. Arrangement method two: as shown... Figure 7 and Figure 8 As shown, according to the actual construction needs on site, the perforated plate 32 of the PBL connector is arranged along the direction of the bridge, and the pre-embedded steel bars 33 of the PBL connector are arranged along the left and right directions of the beam 2.

[0064] Example 2

[0065] Based on the prefabricated concrete guardrail using PBL connectors provided in Embodiment 1, this embodiment proposes a design method for the prefabricated concrete guardrail using PBL connectors, specifically including the following steps:

[0066] Step 1: Determine the guardrail grade and design load based on the required collision protection level;

[0067] Step two involves designing PBL connector 3 and high-strength friction bolt connector 4. Based on the design load, the load design values ​​for PBL connector 3 and the high-strength friction bolt are calculated. The PBL shear key structure is designed according to relevant specifications, and the dimensions and type of the high-strength friction bolt are determined. The design of PBL connector 3 and high-strength friction bolt connector 4 includes the following steps:

[0068] The design value N of the load on the connector is determined based on the height of the prefabricated guardrail.

[0069] The shear bearing capacity of PBL connector 3 is verified using the following formula:

[0070]

[0071]

[0072] In the formula, There are 3 PBL connectors per meter; This is the design value of the single-hole shear bearing capacity of PBL connector 3; It is the diameter of the opening; It refers to the diameter of the transverse through-bar reinforcement, i.e., the diameter of the pre-embedded reinforcement in the PBL connector; It is the design value of the axial tensile strength of concrete; It is the design value of the shear strength of the steel reinforcement, according to the formula. calculate, This is the design value for the tensile strength of the reinforcing steel. To increase the coefficient, we take 6.1.

[0073] The following formula is used to verify the high-strength friction-type bolt connection 4:

[0074]

[0075]

[0076] In the formula, m is the number of high-strength friction bolt connections per meter; This is the design value for the shear bearing capacity of a high-strength friction-type bolted connection; The preload of a high-strength friction-type bolt connection; This represents the number of force-transmitting friction surfaces; denoted as the anti-slip coefficient of the friction surface.

[0077] Step 3: Design the reinforcement of the concrete protruding tooth block 9. The strength verification of the concrete protruding tooth block 9 includes the following steps:

[0078] Assuming the load per meter of guardrail The entire load is borne by the concrete protruding tooth block 9. The strength of the concrete protruding tooth block 9 is verified by the following formula:

[0079]

[0080] In the formula, The shear bearing capacity of the concrete toothed block 9; S represents the design value of the tensile strength of ordinary steel bars; S is the cross-sectional area of ​​shear steel bars per meter.

[0081] Step 4: Supplement the structural requirements of the prefabricated guardrail according to the specifications, including: the hole diameter, spacing, and edge distance of the high-strength friction bolt holes, the grade and preload of the high-strength friction bolts, the anti-slip coefficient of the friction surface of the high-strength friction bolt connection, and the hole size requirements of the PBL connector plate 3.

[0082] Through the above design steps, it is ensured that the prefabricated concrete guardrail based on PBL connector 3 meets the design requirements in terms of load-bearing capacity and stability, and is suitable for the construction needs of guardrails with different anti-collision levels.

[0083] Example 3

[0084] Based on the prefabricated concrete guardrail using PBL connectors provided in Embodiment 1, this embodiment proposes a construction method for the prefabricated concrete guardrail using PBL connectors, specifically including the following steps:

[0085] Step S1: Tie the reinforcing bars of the prefabricated guardrail, beam 2, and concrete toothed block 9 respectively; and embed steel plates in the corresponding positions of the prefabricated guardrail and PBL connectors 3 in the corresponding positions of the beam 2; and reserve bolt holes in the corresponding positions of the prefabricated guardrail, PBL connectors 3, and concrete toothed block 9 when pouring concrete.

[0086] Step S2: After the prefabricated concrete guardrail and beam 2 using PBL connectors have been cured, assemble the guardrail, ensuring that the reserved bolt holes are aligned; assemble high-strength friction bolts to complete the connection between the prefabricated concrete guardrail and beam 2, thereby completing the connection work of the prefabricated concrete guardrail using PBL connectors.

[0087] In summary, the prefabricated concrete guardrail using PBL connectors solves the problem of reliability in the connection between the prefabricated guardrail and the beam 2, which can significantly accelerate the construction speed of the guardrail, ensure construction quality, ensure that the guardrail's anti-collision performance meets the expected requirements, and facilitate the transportation and hoisting of prefabricated components, thus improving the economic benefits of prefabricated guardrails.

[0088] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A precast concrete barrier with PBL connectors, characterized by: The assembly type concrete guardrail with PBL connectors comprises a prefabricated concrete guardrail, a beam body and PBL connectors; The prefabricated concrete guardrail is installed on the left and right sides of the beam body, and comprises an upper concrete guardrail body and a connecting seat connected with the beam body; the outer side of the connecting seat is provided with an inwardly recessed embedding groove; The left and right flange edges of the beam body are provided with upwardly protruding concrete protruding tooth blocks capable of cooperating with the embedding groove, and a plurality of PBL connectors are embedded in the beam body along the bridge direction at the position of the inner side edge of the connecting seat; The prefabricated concrete guardrail, the beam body and the PBL connectors are connected through high-strength friction type bolts sequentially penetrating the concrete protruding tooth blocks, the connecting seat and the PBL connectors, so that the plurality of prefabricated concrete guardrails are installed on the left and right sides of the beam body along the bridge direction.

2. The assembled concrete guardrail using the PBL connector according to claim 1, wherein: The upper concrete guardrail body and the lower connecting seat of the prefabricated concrete guardrail are reinforced concrete structures poured with concrete through reinforcement and formwork, and bolt connection holes are reserved before pouring the concrete; before pouring the concrete, a plurality of guardrail embedded steel plates are embedded on the connecting side of the connecting seat and the PBL connector.

3. The precast concrete barrier with PBL connectors according to claim 2, wherein: The guardrail embedded steel plate is welded with the steel bars in the prefabricated concrete guardrail.

4. The precast concrete barrier with PBL connectors of claim 1, wherein: The concrete protruding tooth block is a reinforced concrete structure poured with concrete through reinforcement and formwork.

5. The PBL connector employed assembled concrete barrier according to claim 1, characterized in that: The PBL connector comprises a PBL connector embedded steel plate, a PBL connector opening plate, a PBL connector embedded steel bar and a PBL connector connecting steel plate; The bottom of the PBL connector embedded steel plate is welded with the PBL connector opening plate, the PBL connector embedded steel bar penetrates the PBL connector opening plate through the through hole on the PBL connector opening plate, the PBL connector embedded steel plate, the PBL connector opening plate and the PBL connector embedded steel bar are all located in the beam body, and the top surface of the PBL connector embedded steel plate is located at the same horizontal plane as the upper surface of the beam body; The upper part of the PBL connector embedded steel plate is welded with the PBL connector connecting steel plate, and the PBL connector connecting steel plate is provided with a through hole for penetrating the high-strength friction type bolt.

6. The precast concrete barrier with PBL connectors of claim 5, wherein: The PBL connector opening plate is arranged along the left and right directions of the beam body, and the PBL connector embedded steel bar is arranged along the bridge direction; or the PBL connector opening plate is arranged along the bridge direction, and the PBL connector embedded steel bar is arranged along the left and right directions of the beam body.

7. A design method of a segmental concrete barrier, the design method of a segmental concrete barrier being directed to the segmental concrete barrier using the PBL connecting member according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: Step one, determining the guardrail grade and design load according to the anti-collision grade requirement; Step two, designing the PBL connector and the high-strength friction type bolt connector; calculating the load design value of the PBL connector and the high-strength friction type bolt according to the design load, designing the PBL shear key structure and determining the size and type of the high-strength friction type bolt according to the corresponding specification; Step three, designing the concrete protruding tooth block reinforcement; Step four, supplementing the structure requirements of the assembly type guardrail according to the specification, including the hole diameter, spacing and edge distance of the high-strength friction type bolt opening, the grade and pretightening force of the high-strength friction type bolt, the anti-sliding coefficient of the high-strength friction type bolt connection friction surface and the opening size requirement of the PBL connector plate.

8. The method of designing a precast concrete barrier as defined in claim 7, wherein: In step two, the PBL connector design and the high-strength friction type bolt connector design The method comprises the following steps: Firstly, determine the load design value N of the connecting piece according to the height of the assembled guardrail; Secondly, calculate the shear bearing capacity of the PBL connecting piece by the following formula: wherein, is the number of PBL connectors per meter; is the design value of the single-hole shear capacity of the PBL connector; is the diameter of the opening; is the diameter of the transverse through reinforcement; is the design value of the axial tensile strength of the concrete; is the design value of the shear strength of the reinforcement; is the design value of the tensile strength of the reinforcement; is the improvement factor; Finally, calculate the high-strength friction type bolt connecting piece by the following formula: wherein m is the number of high-strength friction-type bolted connections per meter; is the design value of the shear bearing capacity of one high-strength friction-type bolted connection; is the pretension of one high-strength friction-type bolted connection; is the number of force-transmitting friction surfaces; is the coefficient of slip resistance of the friction surface.

9. The method of designing a precast concrete barrier as defined in claim 7, wherein: In step three, the strength calculation of the concrete convex tooth block comprises the following steps: Assume the load per meter of guardrail The whole load is borne by the concrete block, and the strength of the concrete block is calculated by the following formula: In the formula, is the shear capacity of the coagulation convex block; is the design value of tensile strength of ordinary steel; S is the cross-sectional area of shear reinforcement per meter.

10. A construction method of a fabricated concrete barrier, the construction method of a fabricated concrete barrier according to any one of claims 1 to 6 using the PBL connecting member, characterized by, The method comprises the following steps: Step S1, bundle the steel bars of the assembled precast guardrail, the beam body and the concrete convex tooth block respectively; embed a steel plate at the corresponding position of the assembled precast guardrail, embed a PBL connecting piece at the corresponding position of the beam body, and reserve bolt holes at the corresponding positions of the assembled precast guardrail, the PBL connecting piece and the concrete convex tooth block when pouring the concrete; Step S2, after the concrete of the assembled concrete guardrail and the beam body adopting the PBL connecting piece is cured, assemble the guardrail to ensure that the reserved bolt holes are aligned, assemble the high-strength friction type bolt to complete the connection between the assembled concrete guardrail and the beam body, thereby completing the connection between the assembled concrete guardrail and the beam body adopting the PBL connecting piece.

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