Highway wave guardrail wave guardrail board installation and precautions

The installation of the wave guardrail of the expressway wave should be based on: the construction technician is familiar with, understands the design drawings and relevant construction specifications, and checks with the construction personnel to the construction site and the design drawings to find out the pile number and various types of the construction section. The structure and the location of each structural guardrail are set, and the construction equipment and materials are put into operation at the same time.

1. Construction preparation

Before the construction begins, the construction technicians are familiar with and understand the design drawings and related construction specifications, and check with the construction personnel to the construction site and the design drawings to find out the construction number of the construction section, various structures and various structural fences. Location, and at the same time do the construction equipment and materials into the field.

2, wave guardrail stakeout

1. The column should be staked out according to the design drawings, and the bridges, passages, culverts, interchanges, and level crossings should be used as the control points for distance measurement. The adjustment section can be used to adjust the spacing, and the distribution method can be used to deal with the number of pitches.

2. In order to accurately stake out and ensure the line shape of the guardrail, the pile number is checked and closed.

3. After the column is staked, the surface state of each column position should be investigated. In case of underground communication pipelines, water discharge, etc., or when the depth of the top of the culvert is insufficient, the position of some columns should be adjusted to change the way of fixing the column.

3, wave guardrail installation

1. Drill the column according to the design drawings and check it to match the line shape.

2. If the basic conditions of the road shoulder permit, the pile should be set by the driving method. The construction should be accurately positioned. The column should be driven into the soil to the design depth. When the depth is too deep, the column should not be pulled out for correction. All of them must be pulled out and re-entered after the foundation is compacted.

3. When the column is difficult to enter, the column can be installed by drilling or excavation. It is installed by drilling method. After the column is positioned, it should be backfilled with the same material as the roadbed, and layered and compacted. The column should be buried by excavation method. The backfill should be made of good material and layered and compacted (each layer should not exceed 15cm) The compaction of the backfill should not be less than the adjacent undisturbed soil.

4. The guardrail column set in the structure, the construction is generally based on the construction of the structure. The guardrails are spliced to each other by splicing bolts and are fixed to the columns or beams by connecting bolts. The connecting bolts and the splicing bolts should not be tightened prematurely, so that the long round holes of the corrugated beams can be adjusted in time to make a smooth line shape and avoid local irregularities. When using the reserved hole foundation, the debris in the hole should be removed first, and the water in the hole should be drained. The bitumen is applied to the bottom of the hole and then placed in the column to control the elevation. You can sand the column around the column. Always keep the correct position and verticality of the column during sand filling. After the sand is shaken, it can be sealed with asphalt to prevent rainwater from leaking into the hole.

5. During the construction of the pillars of the asphalt pavement section, the pillar pits are backfilled and stratified by the same material as the roadbed from the subgrade to the surface layer 5 cm, and the remaining parts are backfilled and compacted with the same material as the pavement.

6. After the column is installed in position, its horizontal direction and vertical direction form a smooth line shape.

7. When constructing the end guardrail of the transition section, the position of the column should be strictly controlled according to the coordinates specified by the design, paying attention to the parabolic shape. The guardrail can be divided into A and S grades according to the anti-collision level. The S-class guardrail is of a reinforced type and is suitable for use on particularly dangerous road sections on the road side. Class A is used for special roads. Commonly used roadside wave beam guardrails can be divided into five levels according to the anti-collision level: B, A, SB, SA, and SS. During the construction of the wave guardrail, the information of various facilities should be accurately grasped, especially the precise position of various pipes buried in the roadbed. During the construction process, no damage to the underground facilities is allowed.

4, corrugated beam installation

1. When the corrugated beam is installed, it is spliced to each other by splicing bolts and fixed to the column or beam by connecting bolts. The guardrails are spliced to each other by splicing bolts and are fixed to the columns or beams by connecting bolts. The connecting bolts and the splicing bolts should not be tightened prematurely, so that the long round holes of the corrugated beams can be adjusted in time to make a smooth line shape and avoid local irregularities. The direction of the corrugated beam is the key to the installation. During the construction, the direction of the overlap should be consistent with the driving direction.

2. The corrugated beam should be continuously adjusted during the installation process. Therefore, the connecting bolt and the splicing bolt should not be tightened too early, so that the long round hole of the corrugated beam can be adjusted in time during the installation process to form a smooth line shape and avoid local unevenness.

3. The top surface of the corrugated beam should be coordinated with the vertical curve of the road during installation. Also check the line shape of the guardrail. When it is determined that the line shape is straight and smooth, the bolt can be finally tightened.

5, matters needing attention

1 The construction preparation should be sufficient, and the location of the construction section should be accurate. The stakeout should be accurate and the error is within the specified range.

2 Column construction should be strict and conscientious. The verticality, spacing, bolt hole position and other dimensions should meet the requirements. If it does not meet the requirements, it should be reworked immediately. At the same time, it should be reworked in strict accordance with the provisions of JTJ074-94.

3 The packaging and marking of corrugated beam plates, columns and other components shall comply with the provisions of GB6725.

The guardrail shall not be bulk when purchased, and shall ensure that the product is not deformed or damaged (injury) during lifting, transportation and stacking. The corrugated fence of the expressway should be fixed and reliable during transportation to prevent the coating from being damaged or deformed by bumps.

4 Pay attention to the packaging and marking of the corrugated beam high-strength splicing bolt connection when purchasing. It should meet the relevant provisions of GB/T1231.

5 The operation of the guardrail should be cautious during construction, and the cables, pipelines and other facilities buried under the road shall not be damaged. The wave guardrail steel is soft and has a strong ability to absorb collision energy. It has a good line of sight induction function, can be coordinated with the road line shape, has a beautiful appearance, can be used on a small radius curve, and the damage is easy to replace.