What are the key points of backfill construction of bridge abutment

Gray soil, gravel soil, or two ash gravel construction party of course wants to use two ash gravel, the cost is high.

The key points of the backfill construction of the bridge abutment are as follows:

1. The scope of the backfill must be carried out in strict accordance with the design documents, and the transition section should be completed, and the compaction degree of the embankment in the transition section should not be less than 96%, and the longitudinal and transverse anti-drainage systems should be connected smoothly.

2. The backfill of the back of the table should be filled in layers, and the maximum compaction thickness of each layer is not more than 15cm.

3. Before the structure is backfilled, draw the marking line of each layer of compaction thickness with eye-catching paint on the back of the table and mark the level.

4. The sequence of backfilling must meet the design requirements. The light abutment back filling of the beam bridge must be carried out after the installation of the beam body is completed; The back filling of the column and ribbed abutment should be carried out symmetrically and evenly on the column and rib sides before the construction of the cap.

5. The backfilling of the abutment back and the cone slope must be carried out synchronously, and ensure that the design width can be reached after compaction and renovation.

6. The culvert should be installed on the cover plate and poured after the support beam (or the slurry stone is paved at the bottom), and the symmetrical layered backfill compaction on both sides of the cave body.

7. In the process of backfilling, water soaking should be prevented. After the backfilling is over, the top should be closed in time.

8. The cone slope protection backfill is filled at the same time as the backfill of the platform, the slope protection in front of the platform is provided with a maintenance platform, and a pedestrian step is set up behind each cone slope, and the maintenance platform is connected with the step.

Specific requirements for backfilling of bridgeheads and abutments: (1) To backfill with permeable materials, the best choice is sandy soil, which is easier to ensure compaction. The use of gravel and sand filling is not recommended.

2) The loose soil at the junction between the embankment and the back of the platform should be excavated to the compacted part to form a stepped shape. (3) The filling thickness of each layer should be strictly controlled, and the compaction thickness should not exceed 20cm. (4) It should be equipped with small tamping tools, and backfilling is not allowed if it is not equipped with small tamping tools.

How to calculate the backfill data of the bridge abutment when calculating the backfill data according to the slope of the abutment, and then the part that connects with the roadbed is closed at 1:1, and the square amount is calculated according to the slope on both sides. Calculate the tire backfill according to the slope of the abutment, and then press 1:

1. Close the slope, calculate the square amount on both sides according to the slope, for example: Backfill amount = (upper width + lower width) * length * depth 2 = (10 + cubic meters. Bench back, now used as a building term, refers to a section of roadbed that connects one or both sides of the dena abutment or culvert with the main roadbed.

This section of the roadbed is connected with the main roadbed on the one hand, and the culvert abutment body is connected on the other hand, because the roller can not be pressed, and the gap between the soil and the concrete side is generated, and it is easy to seep water. And because it is connected with the concrete pouring body, we know that the soil has its natural settlement characteristics, and the concrete pouring body generally does not settle, so this section of the roadbed is more prone to shear failure and produce bridgehead jumping. Therefore, this section of the roadbed is also higher than the main roadbed, the degree of compaction must reach 96%, and the filler should be made of gravel soil or sandy soil with good permeability.

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How to calculate the width of the backfill of the backfill of the bridge abutment backfill data is as follows: the backfill of the platform is calculated from the end of the side wall (or ear wall) from the end of the side wall (or ear wall) along the direction of the route 4m according to the slope of the 1:1 bridge [bridge] refers to the building built for the road to cross natural or artificial obstacles.

Generally speaking, the bridge is composed of five major components and five small parts, and the five major components refer to the bridge span superstructure and substructure that bear the transportation load of automobiles or other vehicles, which is the guarantee of the safety of the bridge structure. Including (1) bridge span structure (or bridge hole structure, superstructure), (2) support system, (3) pier, abutment (4) bearing platform (5) digging well or pile foundation. The five widgets refer to those that are directly related to the service function of the bridge, which used to be called bridge deck construction.

Including (1) bridge deck pavement, (2) anti-drainage system system, (3) railing, (4) expansion joint, (5) lighting. Hope mine can help you <>

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1. The back fill shall not use soil containing impurities, humus or frozen soil blocks. Permeable soil should be used.

2. The back and cone slope should be backfilled at the same time, and should be filled at one time according to the design width.

3 sets of back fill soil should be carried out at the same time as the subgrade soil, and mechanical rolling should be used. It is advisable to backfill sand and gravel and semi-rigid materials within the back of the table, and use small compaction equipment or manual tamping.

4. The back fill of the light abutment should be carried out symmetrically and evenly after the installation of the cover plate and the support beam is completed.

5. The rigid structure should be symmetrical and evenly backfilled at both ends.

6. The back fill of the arch abutment should be completed before the construction of the main arch; The length of the back fill of the arch abutment should meet the design requirements.

7. The back filling of the pillar abutment should be carried out symmetrically and evenly on the column side.

8. The backfill should be layered and tamped, and the degree of compaction of the fill should conform to the relevant provisions of the current national standard "Code for Construction and Quality Acceptance of Urban Road Engineering" CJJ1.

1. The back fill shall not use soil containing impurities, humus or frozen soil blocks. Permeable soil should be used.

2. The back and cone slope should be backfilled at the same time, and should be filled at one time according to the design width.

3 sets of back fill soil should be carried out at the same time as the subgrade soil, and mechanical rolling should be used. Within the back of the table, it is advisable to backfill sand and gravel, semi-rigid materials, disturb the circle and use small compaction equipment or manual tamping.

4. The back fill of the light abutment should be carried out symmetrically and evenly after the installation of the cover plate and the support beam is completed.

5. The rigid structure should be symmetrical and evenly backfilled at both ends.

6. The back fill of the arch abutment should be completed before the construction of the main arch. The length of the back fill of the arch abutment should meet the design requirements.

7. The back filling of the pillar abutment should be carried out symmetrically and evenly on the column side.

8. The backfill should be layered and tamped, and the degree of compaction of the fill should conform to the relevant provisions of the current national standard "Code for Construction and Quality Acceptance of Urban Road Engineering" CJJ1.