Prefabricated guardrail and manufacturing method and mounting method thereof

Abstract

The invention relates to the technical field of road construction, and provides a prefabricated guardrail and a manufacturing method and mounting method.The prefabricated guardrail comprises a guardrail body and extending steel bars, the bottom of the guardrail body is provided with a rectangular notch and a trapezoidal notch which are communicated with each other, and the rectangular notch is located below the trapezoidal notch; the inclined surface of the trapezoidal notch is matched with the slope surface of the vehicle facing side of the guardrail body; the extending steel bars are embedded in the guardrail body and sequentially penetrate through the trapezoidal notches and the rectangular notches. The prefabricated guardrail provided by the invention is used for solving the connection defect between a prefabricated guardrail and a main beam in the prior art, the rectangular notch and the trapezoidal notch are formed in the bottom of the guardrail body for pouring, so that concrete, the extending reinforcing steel bars and the embedded reinforcing steel bars in the to-be-mounted area can form a whole, and the connection mode is more convenient to use. The problems that the welding quality is poor and the bearing capacity of the connecting position of the prefabricated guardrail is damaged by oxidation and corrosion of the welding position can be solved, and the safety and reliability of the prefabricated guardrail can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of road construction, and in particular to a prefabricated guardrail and a manufacturing method and an installation method thereof. Background Art

[0002] Anti-collision guardrails are important transportation infrastructure and an important barrier to protect people's lives. Prefabricated guardrails have the advantages of fast and convenient on-site installation, energy-saving and environmentally friendly construction, and are the future development trend of my country's bridge industry. Prefabricated guardrails are generally connected to the main beam by pre-embedded steel plates at the root of the anti-collision guardrail and the top of the main beam, and the prefabricated guardrail and the main beam are connected by welding between the steel plates. However, this connection method is difficult to ensure the welding quality of the weld during construction. On the other hand, severe corrosion will occur at the connection or welding point under environmental erosion, which will affect the bearing capacity of the prefabricated guardrail. Summary of the invention

[0003] The first aspect of the present invention provides a prefabricated guardrail to solve the connection defects between the prefabricated assembled guardrail and the main beam in the prior art. By setting rectangular notches and trapezoidal notches on the bottom of the guardrail body for casting, the concrete, the protruding steel bars and the embedded steel bars in the installation area can form a whole. This connection method can solve the damage to the bearing capacity of the prefabricated guardrail caused by poor welding quality and oxidation and rust at the welding point, and can improve the safety and reliability of the prefabricated guardrail.

[0004] A second aspect of the present invention provides a method for manufacturing a prefabricated guardrail.

[0005] A third aspect of the present invention provides a method for installing a prefabricated guardrail.

[0006] The prefabricated guardrail provided by the present invention comprises: A guardrail body, wherein the bottom of the guardrail body is provided with a rectangular notch and a trapezoidal notch which are interconnected, the rectangular notch is located below the trapezoidal notch, and the inclined surface of the trapezoidal notch matches the slope of the vehicle-facing side of the guardrail body; The extended steel bar is embedded in the guardrail body and passes through the trapezoidal notch and the rectangular notch in sequence.

[0007] According to the prefabricated guardrail provided by the present invention, a grouting hole is provided on the upper surface of the guardrail body, and the grouting hole is communicated with the trapezoidal notch; At least two grouting holes are provided, and the distance between any two adjacent grouting holes is a, wherein the value range of a is: 90cm≤a≤110cm.

[0008] According to the prefabricated guardrail provided by the present invention, the diameter of the grouting hole is b, wherein the value range of b is: b≥5cm.

[0009] According to the prefabricated guardrail provided by the present invention, the sum of the depths of the rectangular notch and the trapezoidal notch is c, wherein the value range of c is: c≥10D, and D is the diameter of the protruding steel bar.

[0010] According to the prefabricated guardrail provided by the present invention, the protruding steel bars are embedded in the inclined surface of the trapezoidal notch.

[0011] The method for manufacturing a prefabricated guardrail provided by the present invention comprises: Obtain reinforcement cages, UHPC sheathing, steel formwork and notch moulds; Assembling the ultra-high performance concrete guard plate and the steel formwork to obtain a guardrail mold; Fixing the steel cage inside the guardrail mold; The notch mold is fixed to the bottom of the guardrail mold, wherein the shape of the notch mold matches the shape of the rectangular notch and the trapezoidal notch; Concrete pouring is performed on the guardrail mold; After the concrete solidifies, the steel formwork is removed to obtain the prefabricated guardrail.

[0012] According to the manufacturing method of the prefabricated guardrail provided by the present invention, the step of obtaining the steel cage, the ultra-high performance concrete guard plate, the steel formwork and the notch mold comprises: Place a non-chisel stop tape on the inner side of the guard plate mold; pouring ultra-high performance concrete into the guard plate mold; After the ultra-high performance concrete is solidified, the guard plate mold is removed to obtain the ultra-high performance concrete guard plate; An interface agent is applied to the inner surface of the ultra-high performance concrete guard plate.

[0013] According to the manufacturing method of the prefabricated guardrail provided by the present invention, the step of assembling the ultra-high performance concrete guard plate and the steel formwork to obtain the guardrail mold includes: setting the ultra-high performance concrete guard plate on the vehicle-facing surface of the guardrail mold.

[0014] According to the method for manufacturing a prefabricated guardrail provided by the present invention, before the step of removing the steel formwork after the concrete solidifies to obtain the prefabricated guardrail, the method further includes:

[0015] After the concrete is initially set, the notch mold is removed, and the protruding steel bars are inserted into the corresponding positions of the concrete.

[0016] According to the method for manufacturing a prefabricated guardrail provided by the present invention, the step of pouring concrete on the guardrail mold includes: pouring the guardrail mold in an inverted manner.

[0017] The installation method of the prefabricated guardrail provided by the present invention comprises: Pre-treat the area to be installed; Carry the prefabricated guardrails to the area to be installed and place them according to the preset target; The prefabricated guardrail is grouted with ultra-high performance concrete to form an embedded foundation between the prefabricated guardrail and the area to be installed.

[0018] According to the installation method of the prefabricated guardrail provided by the present invention, the step of placing according to the preset target includes: A plurality of the prefabricated guardrails are connected in sequence along the designed route, and polystyrene boards are set in the rectangular notches and trapezoidal notches of the prefabricated guardrails at preset intervals to block them.

[0019] The prefabricated guardrail provided in an embodiment of the present invention sets mutually connected trapezoidal slots and rectangular slots at the bottom of the guardrail body, and makes the inclined surface of the trapezoidal slot match the slope of the guardrail body on the vehicle-facing side. In this way, the slot and the slope of the guardrail body on the vehicle-facing side can change synchronously, and the wall thickness of the guardrail body on the vehicle-facing side can be within a suitable range, thereby ensuring the shear resistance of the guardrail wall thickness on the vehicle-facing side of the guardrail body. In addition, compared with the technical solution of only setting rectangular slots in the prior art, by setting the trapezoidal slot, the depth of the slot can be increased while ensuring the shear resistance of the guardrail wall thickness on the vehicle-facing side of the guardrail body, thereby increasing the anchoring length of the protruding steel bar extending into the slot. After the prefabricated guardrail is installed, the stability and firmness of the embedded foundation formed in the trapezoidal slot and the rectangular slot can be improved.

[0020] Compared with the prior art, the prefabricated guardrail provided in the embodiment of the present invention has rectangular notches and trapezoidal notches at the bottom of the guardrail body and protruding steel bars are embedded on the guardrail body. In this way, during the installation of the prefabricated guardrail, the rectangular notches and trapezoidal notches of the prefabricated guardrail can be cast. After the concrete solidifies, the concrete, the protruding steel bars and the embedded steel bars in the installation area can form a whole, that is, an embedded foundation. This connection method does not require embedded steel plates or welding, which significantly improves construction efficiency. At the same time, it can solve the damage to the bearing capacity of the prefabricated guardrail caused by poor welding quality and oxidation and rust at the welding points, and can improve the safety and reliability of the prefabricated guardrail. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the cross-sectional structure of a prefabricated guardrail provided in an embodiment of the present invention.

[0023] Figure 2 It is a schematic diagram of installing an additional steel structure for a prefabricated guardrail provided in an embodiment of the present invention.

[0024] Figure 3 It is a schematic flow chart of a method for manufacturing a prefabricated guardrail provided in an embodiment of the present invention.

[0025] Figure 4 It is a flow chart of a method for installing a prefabricated guardrail provided in an embodiment of the present invention.

[0026] Figure 5 Schematic diagram of the area to be installed in an embodiment of the present invention.

[0027] Figure 6 It is a schematic diagram of the structure after the prefabricated guardrail in the embodiment of the present invention is installed.

[0028] Reference numerals: 100: guardrail body; 110: rectangular notch; 120: trapezoidal notch; 130: grouting hole; 140: ultra-high performance concrete guard plate; 200: protruding steel bars; 300: embedded steel bars. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0030] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0031] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0033] Figure 1 It is a schematic diagram of the cross-sectional structure of a prefabricated guardrail provided in an embodiment of the present invention.

[0034] See also Figure 1 A first aspect of an embodiment of the present invention provides a prefabricated guardrail, which includes a guardrail body 100 and protruding steel bars 200. The bottom of the guardrail body 100 is provided with a rectangular slot 110 and a trapezoidal slot 120 that are interconnected. The rectangular slot 110 is arranged below the trapezoidal slot 120, wherein the rectangle and trapezoid refer to the shape of the cross-sectional area of ​​the slot. In this embodiment, the cross-section of the trapezoidal slot 120 is a right-angled trapezoid, and the inclined surface of the trapezoidal slot 120 is adapted to the slope of the oncoming side of the guardrail body 100, and the two are arranged in parallel. In an optional embodiment of the present invention, the cross-section of the trapezoidal slot 120 may also be a trapezoid of other shapes. Specifically, it can be adaptively set according to actual conditions.

[0035] The extended steel bar 200 is embedded in the guardrail body 100 and passes through the trapezoidal notch 120 and the rectangular notch 110 in sequence. Figure 1It can be understood that the prefabricated guardrail provided in the embodiment of the present invention, by setting the mutually connected trapezoidal slot 120 and the rectangular slot 110 at the bottom of the guardrail body 100, and making the inclined surface of the trapezoidal slot 120 match the slope of the vehicle-facing side of the guardrail body 100, so that the slot and the slope of the vehicle-facing side of the guardrail body 100 can be changed synchronously, and the wall thickness of the vehicle-facing side of the guardrail body 100 can be within a suitable range, so that the shear resistance of the guardrail wall thickness on the vehicle-facing side of the guardrail body 100 can be ensured; in addition, compared with the technical solution of only setting the rectangular slot 110 in the prior art, by setting the trapezoidal slot 120, the depth of the slot can be increased while ensuring the shear resistance of the guardrail wall thickness on the vehicle-facing side of the guardrail body 100, and then the anchoring length of the protruding steel bar 200 extending into the slot can be increased. When the prefabricated guardrail is installed, the stability and firmness of the embedded foundation formed in the trapezoidal slot 120 and the rectangular slot 110 can be better.

[0036] Compared with the prior art, the prefabricated guardrail provided in the embodiment of the present invention has a rectangular notch 110 and a trapezoidal notch 120 at the bottom of the guardrail body 100, and a protruding steel bar 200 is embedded on the guardrail body 100. In this way, during the installation of the prefabricated guardrail, the rectangular notch 110 and the trapezoidal notch 120 of the prefabricated guardrail can be poured. After the concrete solidifies, the concrete, the protruding steel bar 200 and the embedded steel bar 300 in the installation area can form a whole, that is, an embedded foundation. This connection method does not require embedded steel plates or welding, and can solve the damage to the bearing capacity of the prefabricated guardrail caused by poor welding quality and oxidation and rust at the welding point, thereby improving the safety and reliability of the prefabricated guardrail.

[0037] Figure 2 It is a schematic diagram of installing an additional steel structure for a prefabricated guardrail provided in an embodiment of the present invention.

[0038] Continue reading Figure 1 In an optional embodiment of the present invention, a grouting hole 130 is provided on the upper surface of the guardrail body 100, and the grouting hole 130 is connected to the trapezoidal notch 120; at least two grouting holes 130 are provided, and the spacing between any two adjacent grouting holes 130 is a, wherein the value range of a is: 90cm≤a≤110cm, for example, a can be 90cm, 95cm, 100cm, 105cm or 110cm. It can be understood that by providing the grouting hole 130 on the top of the guardrail body 100, the grouting operation during the installation process can be facilitated, and the construction efficiency can be improved; in addition, during the installation of the prefabricated guardrail, when it is necessary to provide an additional steel structure (such as steel, such as Figure 2As shown in the figure, the spacing between adjacent grouting holes 130 is limited within the above range, so that position interference between the grouting holes 130 and the steel structure can be avoided, which can increase the convenience of construction.

[0039] In addition, in an optional embodiment of the present invention, the grouting hole 130 can also be used as a slurry outlet hole. Specifically, during the installation of the prefabricated guardrail, one of the grouting holes 130 on the prefabricated guardrail can be used for grouting, and the other grouting holes 130 can be used as slurry outlet holes compatible with the aforementioned grouting holes 130. By observing the concrete liquid level in the slurry outlet hole, the grouting conditions inside the inner rectangular notch 110 and the trapezoidal notch 120 can be judged, which can increase the convenience during the construction process.

[0040] Continue reading Figure 1 In an optional embodiment of the present invention, the diameter of the grouting hole 130 is b, wherein the value range of b is: b≥5cm. For example, b can be 5cm, 6cm, 7cm, 8cm or 9cm. It can be understood that due to the rapid loss of surface moisture and easy crusting of ultra-high performance concrete, in order to ensure that the embedded foundation does not delaminate, by limiting the diameter of the grouting hole 130 within the above-mentioned value range, the efficiency of the ultra-high performance concrete during pouring can be guaranteed, thereby ensuring the quality of the embedded foundation.

[0041] Continue reading Figure 1 In an optional embodiment of the present invention, the sum of the depths of the rectangular notch 110 and the trapezoidal notch 120 is c, wherein the value range of c is: c≥10D, D is the diameter of the protruding steel bar 200. It can be understood that in this embodiment, due to the provision of the trapezoidal notch 120, the restriction on the depth of the rectangular notch 110 due to the shear resistance of the wall thickness of the guardrail body 100 on the vehicle-facing side is reduced. From another perspective, it is equivalent to raising the upper limit of the depth of the overall notch of the rectangular notch 110 and the trapezoidal notch 120. Compared with the prior art in which only the rectangular notch 110 is provided, in this way, during the design process, the upper limit of the diameter of the protruding steel bar 200 can be raised. In this way, when it is necessary to improve the embedded foundation strength or the ultimate bearing capacity of the connection, it can be achieved by increasing the diameter of the protruding steel bar 200, that is, the design flexibility of the prefabricated guardrail is improved, and the prefabricated guardrail can be used in a wider range of working environments. In addition, because the protruding length of the protruding steel bar 200 is limited by the sum of the slot depths, by limiting the sum of the slot depths within the above range, it can be ensured that the protruding length of the protruding steel bar 200 can be greater than or equal to 10D, thereby further ensuring the connection strength of the embedded foundation.

[0042] Continue reading Figure 1The protruding steel bar 200 is embedded in the inclined surface of the trapezoidal groove 120, that is, the protruding steel bar 200 is arranged on the vehicle-facing side of the trapezoidal groove 120. It can be understood that by limiting the embedding position of the protruding steel bar 200 to the vehicle-facing side of the trapezoidal groove 120, in this way, during the installation of the prefabricated guardrail, the position interference between the protruding steel bar 200 and the prefabricated steel bars on the installation area can be avoided, which can improve the convenience of the construction process of the prefabricated guardrail and thus improve the overall construction efficiency.

[0043] In addition, when hit by a vehicle, the prefabricated guardrail will tilt outward, and the bottom bending moment will pull the prefabricated guardrail. By setting the protruding steel bars 200 on the vehicle-facing side of the prefabricated guardrail, when the prefabricated guardrail is pulled, the protruding steel bars 200 will become the main force-bearing component, thereby ensuring the strength and stability of the prefabricated guardrail.

[0044] Continue reading Figure 1 In an optional embodiment of the present invention, a chamfer is set at the top of the trapezoidal notch 120. It can be understood that by setting the chamfer, on the one hand, it can facilitate the demolding and installation of the notch mold, and on the other hand, the chamfer can reduce the concentration of local stress, avoid damage to the trapezoidal notch 120 due to stress concentration, and improve the durability and service life of the prefabricated guardrail.

[0045] Figure 3 It is a schematic flow chart of a method for manufacturing a prefabricated guardrail provided in an embodiment of the present invention.

[0046] See also Figures 1 to 3 A second aspect of an embodiment of the present invention provides a method for manufacturing a prefabricated guardrail, which specifically includes the following process.

[0047] S100: Obtain reinforcement cage, UHPCC 140, steel formwork and notch mould.

[0048] Among them, the shape of the notch mold matches the trapezoidal notch 120 and the rectangular notch 110 in the aforementioned embodiment. The notch mold and the steel formwork can be adaptively designed according to actual needs. The steel cage serves as the skeleton of the prefabricated guardrail to ensure the rigidity and strength of the prefabricated guardrail. The steel cage, which is similar to the notch mold, can also be adaptively designed and tied according to actual needs.

[0049] S200: Assemble the ultra-high performance concrete guard plate 140 with the steel formwork to obtain a guardrail mold.

[0050] Specifically, the ultra-high performance concrete guard plate 140 can be assembled using the support bracket according to the design requirements to obtain the guardrail mold. In other words, the ultra-high performance concrete guard plate 140 can be used as one of the surfaces of the prefabricated guardrail mold, so that there is no need to set up an additional steel formwork. It is only necessary to set up the supporting ribs for fixing the ultra-high performance concrete guard plate 140. After the prefabricated guardrail is formed, the ultra-high performance concrete guard plate 140 can be used as a part of the prefabricated guardrail.

[0051] S300: Fixing the steel cage inside the guardrail mold.

[0052] After the guardrail mold is installed, you can put the guardrail mold on its side and put the steel cage into the guardrail mold from the bottom of the guardrail mold. This can improve the convenience and efficiency of the steel cage installation.

[0053] S400: fixing the notch mold to the bottom of the guardrail mold, wherein the shape of the notch mold matches the shapes of the rectangular notch 110 and the trapezoidal notch 120 .

[0054] Specifically, after the steel cage is fixed, the notch mold is placed at the bottom of the guardrail mold and fixed.

[0055] S500: pouring concrete into the guardrail mold.

[0056] When casting the guardrail mold, ordinary concrete or ultra-high performance concrete can be used. Specifically, it can be adaptively set according to actual conditions.

[0057] S600: After the concrete solidifies, the steel formwork is removed to obtain a prefabricated guardrail.

[0058] See also Figure 1 and Figure 3 It can be understood that the manufacturing method of the prefabricated guardrail provided in the embodiment of the present invention uses the ultra-high performance concrete guard plate 140 as a part of the guardrail mold. In this way, when the prefabricated guardrail is formed, one side of the prefabricated guardrail is the ultra-high performance concrete guard plate 140. The ultra-high performance concrete guard plate 140 has high density and ultra-high durability, which can effectively prevent the chloride ion erosion of deicing salt and improve the service life of the prefabricated guardrail. On the other hand, using the ultra-high performance concrete guard plate 140 as a part of the prefabricated guardrail can also reduce the cost of making the guardrail mold.

[0059] In addition, by fixing the notch mold to the bottom of the guardrail mold, when the prefabricated guardrail is formed, the bottom of the prefabricated guardrail can form the trapezoidal notch 120 and the rectangular notch 110 that are interconnected in the aforementioned embodiment, wherein the inclined surface of the trapezoidal notch 120 is adapted to the slope of the guardrail body 100 on the vehicle-facing side, so that the notch and the slope of the guardrail body 100 on the vehicle-facing side can change synchronously, and the wall thickness of the guardrail body 100 on the vehicle-facing side can be within a suitable range, thereby ensuring the shear resistance of the guardrail wall thickness on the vehicle-facing side of the guardrail body 100.

[0060] In addition, compared with the technical solution of only setting a rectangular slot 110 in the prior art, the embodiment of the present invention sets a slot mold at the bottom of the guardrail mold. The slot formed in this way can increase the depth of the slot while ensuring the shear resistance of the guardrail wall thickness on the oncoming side of the guardrail body 100. This can increase the anchoring length of the protruding steel bar 200 extending into the slot. After the prefabricated guardrail is installed, the stability and firmness of the embedded foundation formed in the trapezoidal slot 120 and the rectangular slot 110 can be improved.

[0061] Compared with the prior art, the manufacturing method of the prefabricated guardrail provided in the embodiment of the present invention provides a notch mold at the bottom of the guardrail mold. The notch formed in this way can be used to pour the rectangular notch 110 and the trapezoidal notch 120 of the prefabricated guardrail during the installation process of the prefabricated guardrail. After the concrete solidifies, the concrete, the protruding steel bars 200 and the embedded steel bars 300 in the installation area can form a whole, that is, an embedded foundation. This connection method does not require embedded steel plates or welding, which significantly improves construction efficiency, can solve the damage to the bearing capacity of the prefabricated guardrail caused by poor welding quality and oxidation and rust at the welding point, and can improve the safety and reliability of the prefabricated guardrail.

[0062] In an optional embodiment of the present invention, step S100 also includes a step of making an ultra-high performance concrete guard plate 140, and the specific steps are as follows.

[0063] Step 1: Assemble the guard plate mold and place a non-chipping stop tape on the inside of the guard plate mold.

[0064] The position of the roughening-free grout-stopping strip corresponds to the inner surface of the ultra-high performance concrete guard plate 140 .

[0065] Step 2: Pour ultra-high performance concrete into the guard plate mold.

[0066] Step 3: After the ultra-high performance concrete is solidified, the guard plate mold is removed to obtain the ultra-high performance concrete guard plate 140.

[0067] Step 4: Apply interface agent to the inner surface of the ultra-high performance concrete guard plate 140.

[0068] It can be understood that by placing a roughening-free stop-grouting tape on the inner side of the guard plate mold, the surface roughness and uniformity of the ultra-high performance concrete guard plate 140 can be enhanced after the ultra-high performance guard plate is formed. Compared with the method of roughening and engraving the ultra-high performance concrete guard plate 140 after it is formed, this method can save time and labor, is more environmentally friendly (there is no grinding step, so no dust is generated), can save a lot of labor costs, and can perfectly ensure the roughness; in addition, due to the relatively thin thickness of the guard plate, mechanical measures such as roughening and engraving may also cause damage to the guard plate, and at the same time cause waste of materials. This problem can be avoided by using a roughening-free stop-grouting tape.

[0069] In addition, in the embodiment of the present invention, by applying an interface agent on the inner surface of the ultra-high performance concrete, when the guardrail mold is cast, the bonding strength between the cast concrete and the ultra-high performance concrete guard plate 140 can be improved, which can promote the integration of the prefabricated guardrail after molding.

[0070] In an optional embodiment of the present invention, step S200 includes: placing the ultra-high performance concrete guard plate 140 on the vehicle-facing side of the guardrail mold. Figure 1 It is understandable that, since cities in northern my country often use chloride salt de-icing agents for snow removal in winter, guardrails are prone to repeated freeze-thaw and salt freezing in such an environment. At the same time, there are a large number of chloride ions in the deicing salt. After the chloride ions penetrate into the concrete, they will destroy the passivation film of the steel bars, form corrosion cells inside the concrete, and cause steel corrosion. The volume expansion effect of the steel corrosion process will cause concrete cracking along the bars and other diseases, seriously affecting the durability of the anti-collision guardrail. The embodiment of the present invention sets the ultra-high performance concrete mold on the front side of the guardrail mold. In this way, the ultra-high performance concrete guard plate 140 will become the front side of the prefabricated guardrail. The high density and ultra-high durability of the ultra-high performance concrete can effectively prevent the chloride ion erosion of the deicing salt and improve the service life of the prefabricated guardrail.

[0071] In an optional embodiment of the present invention, a guard plate of any shape can be cast according to various forms and grades of precast concrete guardrails (for example, types: F-type concrete guardrail, combined guardrail, central isolation belt guardrail, etc.; grades: SS grade, SA grade, SB grade, A grade, etc.). Specifically, it can be adaptively set according to actual conditions. Similarly, the width of the notch mold and the wall thickness of the oncoming guardrail can be adaptively adjusted according to various forms and grades of precast concrete guardrails. Specifically, it can be adaptively set according to actual conditions, which will not be repeated herein.

[0072] In an optional embodiment of the present invention, before step S600, the process further includes: after the concrete is initially set, removing the notch mold, and inserting the protruding steel bar 200 into the corresponding position of the concrete.

[0073] It should be noted that the protruding steel bar 200 needs to be inserted on the side of the trapezoidal notch 120 facing the oncoming vehicle surface; it is understandable that if the protruding steel bar 200 is pre-embedded in advance, the hook at its end will seriously affect the demoulding of the notch mold, and the production of the notch mold will also be more complicated. In the embodiment of the present invention, the protruding steel bar 200 is not pre-embedded during pouring. After the concrete is initially set, the notch mold can be removed and the protruding steel bar 200 can be inserted into the concrete. This method can improve the convenience of the production process and facilitate demoulding, which can greatly reduce the difficulty of making prefabricated guardrails and improve economy.

[0074] In an optional embodiment of the present invention, step S500 includes: using an inverted casting method for the guardrail mold; it can be understood that using an inverted casting method with the bottom facing upward during casting can make the concrete flow more easily, vibrate more conveniently, and facilitate the adjustment of the notch mold, which can greatly improve the efficiency of the guardrail prefabrication process.

[0075] In an optional embodiment of the present invention, when manufacturing the ultra-high performance concrete guard plate 140, a disposable protective sticker can be pasted on the vehicle-facing surface of the ultra-high performance concrete guard plate 140. In this way, when the prefabricated guardrail is completed, the protective paper is torn off, and a clean and smooth prefabricated guardrail with a vehicle-facing surface can be directly obtained. If there are glue marks, they can be wiped clean by using an organic solvent.

[0076] In an optional embodiment of the present invention, during the process of steps S300 and S400, embedded parts such as grouting hole steel pipes and lifting sleeves can also be pre-embedded according to actual needs. Specifically, they can be adaptively set according to actual conditions, which will not be elaborated in this article.

[0077] Figure 4 It is a schematic diagram of a flow chart of a method for installing a prefabricated guardrail provided in an embodiment of the present invention; Figure 5 is a schematic diagram of an area to be installed in an embodiment of the present invention; Figure 6 It is a schematic diagram of the structure after the prefabricated guardrail in the embodiment of the present invention is installed.

[0078] See also Figures 4 to 6 A third aspect of an embodiment of the present invention provides a method for installing a prefabricated guardrail, which specifically includes the following steps.

[0079] S10: Pre-process the area to be installed.

[0080] Among them, it is necessary to set up pre-embedded steel bars 300 in the installation area (such as main beams, retaining walls, etc.). If the installation area is a newly built structure, the embedded steel bars 300 can be set in advance by pre-embedded method. If it is an existing structure, it is necessary to plant reinforcement in the installation area. Specifically, please refer to the adaptive design of the existing technology.

[0081] It should be noted that space should be left when tying the embedded steel bars 300 to prevent the embedded steel bars 300 from interfering with the extended steel bars 200. In addition, the surface of the installation area needs to be cleaned and the surface needs to be leveled with mortar.

[0082] S20: transporting the prefabricated guardrail to the area to be installed and placing it according to a preset target; specifically, the prefabricated guardrail can be hoisted to the area to be installed by a hoisting machine.

[0083] S30: performing ultra-high performance concrete grouting on the prefabricated guardrail to form an embedded foundation between the prefabricated guardrail and the area to be installed.

[0084] Specifically, when the prefabricated guardrail is in place, ultra-high performance concrete can be poured through the aforementioned grouting hole 130. After the ultra-high performance concrete solidifies, the ultra-high performance concrete located in the trapezoidal groove 120 and the rectangular groove 110, as well as the protruding steel bars 200 and the embedded steel bars 300 will form a whole, namely the aforementioned embedded foundation.

[0085] See also Figure 1 , Figures 3 to 5 It can be understood that in the installation method of the prefabricated guardrail provided in the embodiment of the present invention, the prefabricated guardrail is grouted with ultra-high performance concrete. In this way, the ultra-high performance concrete can form an embedded foundation between the rectangular notch 110 and the trapezoidal notch 120 of the prefabricated guardrail and the top surface of the area to be installed. The embedded foundation formed by the ultra-high performance concrete material has good durability and can ensure the connection effect. In addition, the ultra-high performance concrete has high density, and the embedded foundation formed in this way will not form a water seepage channel, and the steel bars therein will not be corroded by salt water. Compared with the post-cast strip of the conventional guardrail, the durability is better, which can greatly improve the durability of the prefabricated guardrail.

[0086] In addition, by utilizing the high strength of ultra-high performance concrete and the strong bond strength of steel bars, the protruding steel bars 200 do not need to be tied or welded to the area to be installed (main beam, retaining wall, etc.), which can greatly reduce the workload on site and improve installation efficiency.

[0087] In an optional embodiment of the present invention, step S20 includes: connecting multiple prefabricated guardrails in sequence along the designed route, and setting polystyrene boards in the rectangular notches 110 and the trapezoidal notches 120 of the prefabricated guardrails at preset intervals.

[0088] In this embodiment, the preset distance can be set to 10m. It should be noted that the preset distance can be set adaptively according to the actual situation. Setting the polystyrene board to block and ensure the longitudinal steel bar connection is equivalent to slitting the embedded foundation, which can prevent the grouting time from being too long and affecting the performance of the ultra-high performance concrete.

[0089] It should be noted that the technical solutions in various embodiments of the present invention can be combined with each other, but the basis for the mutual combination is that it can be implemented by ordinary technicians in the field; when the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist, that is, it does not belong to the protection scope of the present invention.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A prefabricated guardrail, characterized in that: include: A guardrail body (100), wherein a rectangular notch (110) and a trapezoidal notch (120) are provided at the bottom of the guardrail body (100) and are connected to each other, the rectangular notch (110) is located below the trapezoidal notch (120), and the inclined surface of the trapezoidal notch (120) matches the slope of the oncoming side of the guardrail body (100); The extended steel bar (200) is embedded in the guardrail body (100) and sequentially penetrates the trapezoidal notch (120) and the rectangular notch (110).

2. The prefabricated guardrail according to claim 1, characterized in that: The upper surface of the guardrail body (100) is provided with a grouting hole (130), and the grouting hole (130) is communicated with the trapezoidal notch (120); At least two grouting holes (130) are provided, and the distance between any two adjacent grouting holes (130) is a, wherein the value range of a is: 90 cm≤a≤110 cm.

3. The prefabricated guardrail according to claim 2, characterized in that: The diameter of the grouting hole (130) is b, wherein the value range of b is: b≥5 cm.

4. The prefabricated guardrail according to any one of claims 1 to 3, characterized in that: The sum of the depths of the rectangular notch (110) and the trapezoidal notch (120) is c, wherein the value range of c is: c≥10D, and D is the diameter of the protruding steel bar (200).

5. The prefabricated guardrail according to any one of claims 1 to 3, characterized in that: The protruding steel bar (200) is embedded in the inclined surface of the trapezoidal notch (120).

6. A method for manufacturing a prefabricated guardrail, characterized in that: include: Obtain reinforcement cages, UHPC sheathing, steel formwork and notch moulds; Assembling the ultra-high performance concrete guard plate and the steel formwork to obtain a guardrail mold; Fixing the steel cage inside the guardrail mold; The notch mold is fixed to the bottom of the guardrail mold, wherein the shape of the notch mold matches the shape of the rectangular notch and the trapezoidal notch; Concrete pouring is performed on the guardrail mold; After the concrete solidifies, the steel formwork is removed to obtain the prefabricated guardrail.

7. The method for manufacturing a prefabricated guardrail according to claim 6, characterized in that: The steps of obtaining the steel cage, the ultra-high performance concrete guard plate, the steel formwork and the notch mold include: Place a non-chisel stop tape on the inner side of the guard plate mold; pouring ultra-high performance concrete into the guard plate mold; After the ultra-high performance concrete is solidified, the guard plate mold is removed to obtain the ultra-high performance concrete guard plate; An interface agent is applied to the inner surface of the ultra-high performance concrete guard plate.

8. The method for manufacturing a prefabricated guardrail according to claim 7, characterized in that: The step of assembling the ultra-high performance concrete guard plate and the steel formwork to obtain a guardrail mold includes: setting the ultra-high performance concrete guard plate on the vehicle-facing surface of the guardrail mold.

9. The method for manufacturing a prefabricated guardrail according to any one of claims 6 to 8, characterized in that: Before the step of removing the steel formwork after the concrete solidifies to obtain the prefabricated guardrail, the method also includes: After the concrete is initially set, the notch mold is removed, and the protruding steel bars are inserted into the corresponding positions of the concrete.

10. The method for manufacturing a prefabricated guardrail according to any one of claims 6 to 8, characterized in that: The step of pouring concrete on the guardrail mold includes: pouring the guardrail mold in an inverted manner.

11. A method for installing a prefabricated guardrail, characterized in that: include: Pre-treat the area to be installed; Carry the prefabricated guardrails to the area to be installed and place them according to the preset target; The prefabricated guardrail is grouted with ultra-high performance concrete to form an embedded foundation between the prefabricated guardrail and the area to be installed.

12. The method for installing a prefabricated guardrail according to claim 11, characterized in that: The steps of placing according to the preset target include: A plurality of the prefabricated guardrails are connected in sequence along the designed route, and polystyrene boards are set in the rectangular notches and trapezoidal notches of the prefabricated guardrails at preset intervals to block them.

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