Northern durable cement concrete guardrail structure

Abstract

The northern durable cement concrete guardrail structure comprises guardrail concrete and framework reinforcing steel bars poured in the guardrail concrete, the framework reinforcing steel bars are composed of inner side reinforcing steel bars, outer side reinforcing steel bars and longitudinal reinforcing steel bars which are bound together, and the guardrail concrete on the outer side of the inner side reinforcing steel bars is an inner side reinforcing steel bar net protection layer; the guardrail is characterized in that a guardrail vehicle facing surface concrete compact layer is formed on the outer side of the inner side steel bar net protection layer, and a silane coating is sprayed on the outer surface of the guardrail vehicle facing surface concrete compact layer. According to the northern durable cement concrete guardrail structure, the silane coating can effectively prevent external water from entering the guardrail concrete to corrode the framework reinforcing steel bars, and the guardrail head-on concrete compact layer can effectively prevent the vehicle facing face of the guardrail from cracking, so that the guardrail is not prone to cracking under the influence of snow melting agents, frost heaving, dryness, wetness and temperature changes, and the service life of the guardrail is prolonged. Diseases such as peeling, falling off and steel bar corrosion are not easy to occur, so that the guardrail can meet the requirement of design age limit.

Description

Technical Field

[0001] This utility model relates to a bridge railing structure, and more specifically, to a durable cement concrete railing structure for northern regions. Background Technology

[0002] Against the backdrop of my country's rapid economic development, the road network is becoming increasingly dense, and correspondingly, the number of bridges is also increasing. To ensure traffic safety, cement concrete guardrails are required on both sides of bridges. During the service life of bridges, especially in northern my country, cement concrete bridge guardrails are prone to peeling, detachment, and steel reinforcement corrosion due to the effects of humidity, frost heave, and de-icing agents. The damage is particularly severe on the facing concrete of bridge guardrails. This is because the facing concrete is poured on a negative slope, making it difficult to vibrate and allowing internal air and moisture to escape. This results in numerous air bubbles and water blisters on the surface of the facing concrete, leading to reduced concrete strength. Combined with the effects of de-icing agents, frost heave, humidity fluctuations, and temperature changes, the facing concrete is highly susceptible to damage, affecting the durability of the guardrail. Therefore, currently, using strength alone to control the durability of guardrails is insufficient to meet the design life requirements. Summary of the Invention

[0003] In order to overcome the shortcomings of the above-mentioned technical problems, this utility model provides a durable cement concrete guardrail structure for northern regions.

[0004] This utility model discloses a durable cement concrete guardrail structure for northern regions, comprising guardrail concrete and reinforcing steel reinforcement cast in the guardrail concrete. The reinforcing steel reinforcement consists of inner reinforcing steel, outer reinforcing steel, and longitudinal reinforcing steel tied together. The guardrail concrete outside the inner reinforcing steel forms a net protective layer for the inner reinforcing steel. The feature is that a dense concrete layer for the guardrail's oncoming surface is formed outside the net protective layer for the inner reinforcing steel, and a silane coating is sprayed onto the outer surface of the dense concrete layer for the oncoming surface of the guardrail.

[0005] This utility model discloses a durable cement concrete guardrail structure for northern regions, comprising an inner template and an outer template used during the pouring of the cement concrete guardrail. The inner surface of the inner template is provided with a permeable and breathable template cloth for forming a dense layer of concrete on the front face of the guardrail. After the inner template is fixed in place, the lower end of the permeable and breathable template cloth passes through the bottom of the inner template, and the part of the permeable and breathable template cloth passing through the lower end of the inner template forms an outward fold of the template cloth.

[0006] The durable cement concrete guardrail structure of this utility model is provided in northern regions, wherein the outer surfaces of the inner reinforcing bars, outer reinforcing bars and longitudinal reinforcing bars are all coated with an anti-rust coating.

[0007] The present invention relates to a durable cement concrete guardrail structure for northern regions, wherein the anti-rust coating is an epoxy resin coating with a thickness of 180μm~250μm.

[0008] This utility model relates to a durable cement concrete guardrail structure for northern regions. The cement used in the guardrail concrete is silicate cement with a grade of 40MPa to 45MPa.

[0009] The thickness of the inner steel reinforcement protective layer of this utility model for durable cement concrete guardrails in northern regions is 5cm to 6cm.

[0010] The present invention relates to a durable cement concrete guardrail structure for northern regions, wherein the silane coating is made of a penetrating crystalline silane material.

[0011] The beneficial effects of this utility model are as follows: The durable cement concrete guardrail structure of this utility model is composed of guardrail concrete and reinforcing steel bars cast in the guardrail concrete. The reinforcing steel bars are composed of inner reinforcing bars, outer reinforcing bars, and longitudinal reinforcing bars. The guardrail concrete outside the inner reinforcing bars forms a net protective layer for the inner reinforcing bars. A dense concrete layer for the guardrail's oncoming surface is formed outside the net protective layer for the inner reinforcing bars. A silane coating is sprayed on the outer surface of the dense concrete layer for the oncoming surface of the guardrail. In this way, the silane coating can effectively prevent external moisture from entering the guardrail concrete and corroding the reinforcing steel bars. The dense concrete layer for the oncoming surface of the guardrail can effectively prevent cracking of the guardrail's oncoming surface and further prevent corrosion of the reinforcing steel bars. Even under the influence of de-icing agents, frost heave, wet and dry conditions, and temperature changes, the guardrail is not prone to peeling, flaking, or steel bar corrosion, ensuring that the guardrail can meet the design life requirements.

[0012] Furthermore, during the pouring process of the cement concrete guardrail, an inner formwork with a permeable and breathable template cloth fixed to its inner surface is used for support. The permeable and breathable template cloth extends from the bottom of the inner formwork (the extending part forms the outward fold of the template cloth). This allows air and moisture inside the concrete to be expelled along the template cloth at the bottom of the formwork during the pouring process. This reduces the water content on the surface of the guardrail, maintains the curing of the concrete, makes it less prone to early micro-cracks, increases the density of the concrete on the vehicle-facing side, and helps to form a dense concrete layer on the vehicle-facing surface of the guardrail. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of the durable cement concrete guardrail structure for northern regions according to this utility model.

[0014] Figure 2 This is a schematic diagram of the inner template of the present invention, which is provided with a water-permeable and breathable template cloth.

[0015] In the diagram: 1. Guardrail concrete, 2. Reinforcing steel frame, 3. Inner reinforcing steel net protective layer, 4. Dense concrete layer of guardrail facing the vehicle, 5. Silane coating, 6. Inner reinforcing steel, 7. Outer reinforcing steel, 8. Longitudinal reinforcing steel, 9. Inner formwork, 10. Water-permeable and breathable formwork fabric, 11. Outward fold of formwork fabric. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 The diagram shows a structural schematic of the durable cement concrete guardrail structure for northern regions according to this utility model. The cement concrete guardrail structure consists of guardrail concrete 1 and reinforcing steel reinforcement 2 cast within the guardrail concrete 1. The reinforcing steel reinforcement 2 is composed of inner reinforcing steel 6, outer reinforcing steel 7, and longitudinal reinforcing steel 8. The lower ends of the inner reinforcing steel 6 and outer reinforcing steel 7 are inserted into the foundation. The longitudinal reinforcing steel 8 binds adjacent inner reinforcing steel 6 and adjacent outer reinforcing steel 7 together. The guardrail concrete 1 outside the inner reinforcing steel 6 forms a net protective layer 3 for the inner reinforcing steel.

[0018] A dense concrete layer 4 for the guardrail's facing surface is formed on the outer side of the inner steel reinforcement protective layer 3. A silane coating 5 is applied to the outer surface of this dense concrete layer 4. The silane coating 5 effectively blocks external moisture from entering, protecting the inner dense concrete layer 4, the guardrail concrete 1, and the reinforcing steel 2, preventing cracking of the dense concrete layer 4 and corrosion of the reinforcing steel 2. The dense concrete layer 4 effectively increases the density of the facing surface, preventing cracking and further preventing corrosion of the internal reinforcing steel 2, thus ensuring the cement concrete guardrail reaches its designed service life.

[0019] The dense concrete layer 4 on the guardrail's oncoming face is formed during the pouring of guardrail concrete 1, such as... Figure 2 As shown, a structural schematic diagram of the inner template with permeable and breathable template cloth in this utility model is given. When the guardrail concrete 1 is poured, the inner template 9 and the outer template are fixed on both sides of the skeleton steel bar 2. The permeable and breathable template cloth 10 shown is fixed on the inner surface of the inner template 9. When the inner template 9 is fixed, the permeable and breathable template cloth 10 passes through the bottom of the inner template 9. The part of the permeable and breathable template cloth 10 that passes through the bottom of the inner template 9 forms the outer folded part 11 of the template cloth.

[0020] In this way, during the pouring of the guardrail concrete 1, the air and moisture in the guardrail concrete 1 near the breathable and permeable formwork 10 will be discharged from the top and bottom of the inner formwork 9 along the permeable and permeable formwork 10. This reduces the water content on the surface of the guardrail concrete 1, and a dense layer 4 of the guardrail facing concrete is formed near the permeable and permeable formwork 10, which is beneficial to the curing of the concrete. After the guardrail concrete 1 is poured, the inner formwork 9 can only be removed 24 hours later, so that the dense layer 4 of the guardrail facing concrete is less likely to develop early micro-cracks, and the density of the concrete facing the vehicle is increased.

[0021] To further enhance the corrosion resistance of the reinforcing steel bars 2, the outer surfaces of the inner reinforcing steel bars 6, the outer reinforcing steel bars 7, and the longitudinal reinforcing steel bars 8 are all coated with an anti-rust coating. The anti-rust coating can be an epoxy resin coating with a thickness of 180μm~250μm.

[0022] The cement used in the guardrail concrete 1 is silicate cement, and the grade of the cement used in the guardrail concrete 1 is 40MPa~45MPa. The thickness of the net protective layer 3 for the side reinforcement is 5cm~6cm. The cement concrete with a thickness of 5cm~6cm can protect the inner reinforcement 6 on the inner side.

[0023] The silane coating 5 shown uses a penetrating crystalline silane material. The silane coating 5 can only be applied after the guardrail has been cured for 7 days. The suitable temperature range for the application of the silane coating 5 is 5°C to 45°C. In order to ensure the effective thickness of the sprayed silane coating 5, the spraying amount of the silane coating 5 should not be less than 300g per square meter.

Claims

1. A north durable cement concrete guardrail structure, comprising guardrail concrete (1) and skeleton steel bars (2) cast in the guardrail concrete, the skeleton steel bars are composed of inner steel bars (6), outer steel bars (7) and longitudinal steel bars (8) tied together, the guardrail concrete outside the inner steel bars is the net protection layer (3) of the inner steel bars; characterized in that: The inner side of the net protection layer of the inner side steel bar is formed with a guardrail vehicle-facing concrete dense layer (4), and the outer surface of the guardrail vehicle-facing concrete dense layer is sprayed with a silane coating (5).

2. The northern durable cement concrete guardrail structure according to claim 1, characterized in that: The inner side formwork (9) and the outer side formwork used when pouring the cement concrete guardrail are included, and the inner surface of the inner side formwork is provided with a water-permeable and air-permeable formwork cloth (10) used for forming the guardrail vehicle-facing concrete dense layer (4); after the inner side formwork is fixed in place, the lower end of the water-permeable and air-permeable formwork cloth is passed out from below the inner side formwork, and the part where the water-permeable and air-permeable formwork cloth passes through the lower end of the inner side formwork forms a formwork cloth outer folding part (11).

3. A northern durable cement concrete barrier structure according to claim 1 or 2, characterized in that: The outer surfaces of the inner side steel bar (6), the outer side steel bar (7) and the longitudinal steel bar (8) are all coated with a rust-proof coating.

4. The northern durable cement concrete guardrail structure according to claim 3, characterized in that: The rust-proof coating is an epoxy resin coating, and the thickness of the epoxy resin coating is 180-250 microns.

5. The northern durable cement concrete guardrail structure according to claim 1 or 2, characterized by: The cement used by the guardrail concrete (1) is Portland cement, and the grade of the cement used by the guardrail concrete is 40-45 MPa.

6. The northern durable cement concrete guardrail structure according to claim 1 or 2, characterized by: The thickness of the net protection layer (3) of the inner side steel bar is 5-6 cm.

7. The northern durable cement concrete guardrail structure according to claim 1 or 2, characterized by: The silane coating (5) uses a permeable crystalline silane material.

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