Hunan waveform fence installation program and precautions
1, construction preparation
Before the construction of the rural road waveform guardrail, the construction technicians must be familiar with and understand the design drawings and related construction specifications, and check with the construction personnel to the construction site and design drawings to find out the construction section and the various types of structures. The locations of the objects and the various waveform guardrails, as well as the entry of construction equipment and materials.
2, wave fences lofting
The rural waveform fence security projects in all parts of Hunan are related to township roads. The conditions of the road conditions are complex, and some road widths are less than 3.5 meters. Therefore, when staking out, if the shoulder conditions permit, try to rely on roadside stakeout to maximize the Ensure the width of the road surface and increase the safe space for vehicles.
1. The column should be laid out according to the design drawings, and bridges, passageways, culverts, overpasses, crossings, etc. should be used as control points for distance measurement and positioning. The adjustment section can be used to adjust the spacing and the distribution method can be used to deal with the number of gaps.
2. In order to accurately set out and ensure the line shape of the guardrail, the stand section shall be rechecked and closed.
3. After the studs have been staked out, the ground state of each stud position should be investigated. In case of underground communication pipelines, water leakage, etc., or the depth of the culvert buried at the top is insufficient, the position of some studs should be adjusted and the stud fixing method should be changed.
3ã€Installation Experience of Changsha Waveform Guardrail Changsha Baohua Company
1. Drill holes in the columns according to the design drawings and check them to make them compatible with the road alignment.
2. If the basic condition of the road shoulder permits, use the driving method to set up the piles, and the construction should be precisely positioned. When the column is driven into the soil, it should reach the design depth. When it is too deep, it must not be corrected by pulling out the column part. All of them must be pulled out and re-entered after the foundation is compacted.
3. When the column is difficult to enter, install the column by drilling or excavation. Drilling method is used for installation. After the positioning of the column, the same material as the roadbed shall be backfilled and layered and compacted. The column shall be buried by excavation. The backfill shall be made of good materials and layered and compacted (each layer shall not exceed 15cm in thickness). The degree of compaction of the backfill soil should not be less than the adjacent undisturbed soil.
4. The columns of the guardrails installed in the structures are generally constructed on the foundations of the structures. When using the reserved hole foundation, the debris in the hole should be removed first, and the accumulated water in the hole should be sucked out. The asphalt should be painted at the bottom of the hole and then put into the column to control the elevation. You can sand around the column. The correct position and verticality of the column must be maintained during sanding. After tapping the sand, it can be sealed with asphalt to prevent rain from leaking into the hole.
5. During the construction of the column of asphalt pavement section, the column pit shall be backfilled and layered with the same material as the roadbed from 5cm under the roadbed to the surface layer. The remaining part shall be backfilled and compacted with the same material as the road surface.
6. When the column is installed in place, the horizontal direction and the vertical direction form a smooth line shape.
7. In the construction of the end fence of the transition section, the position of the column shall be strictly controlled according to the coordinates specified in the design, and the parabolic shape shall be taken into account.
4, wave beam installation
1. When the wave beam is installed, they are spliced ​​with each other by splicing bolts, and are fixed on the column or beam by connecting bolts. The splicing direction of the wave beam is the key to the installation. The lap direction should be consistent with the driving direction during construction.
2. The wave beam should be adjusted during the installation process. Therefore, the bolts and splicing bolts should not be tightened prematurely so that the oblong holes of the wave beam can be adjusted in time during the installation to form a smooth line shape and avoid local irregularities.
3. The top surface of the wave beam should be coordinated with the vertical curve of the road during installation. And check the line shape of the guardrail. When it is determined that the line shape is straight and smooth, tighten the bolts last.
5, matters needing attention
1 The construction preparation should be sufficient and the location of the construction section should be accurately located. The lofting should be precise and the error is within the specified range.
2 Post construction shall be strictly serious, and its verticality, spacing, bolt hole position and other dimensions shall meet the requirements. If it does not meet the requirements, it shall be reworked immediately. At the same time, rework shall be carried out in strict accordance with the provisions of specification JTJ074-94.
3 The packing and marking of components such as corrugated beam plates and columns shall comply with the provisions of GB6725. The guardrail shall not be bulked during purchase, and shall ensure that the product will not be deformed or damaged (injured) during lifting, transport, or stacking. The transportation should be fixed and reliable to prevent damage to the coating or deformation of the components due to bumps.
4 Pay attention to the packing and marking of the high beam splicing bolt connection at the wave beam when purchasing goods should comply with the relevant provisions of GB/T1231.
5 The guardrail should be operated with caution in construction and must not damage the cables, pipes and other facilities buried under the road surface.
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