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Method for performing backfilling and hydraulic ramming on stage back of bridges and culverts

A bridge and culvert, hydraulic technology, applied in soil protection, construction, infrastructure engineering and other directions, can solve the problems of low compaction quality, increased construction costs, slow construction progress, etc., to ensure compaction quality, save construction costs, The effect of reducing the amount of construction

Active Publication Date: 2019-08-09
CHINA MCC17 GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, during the backfill construction of the bridge and culvert abutment, due to the influence of the narrow working face and the safety distance from the structure, the vibratory roller is not in place, and the dynamic compaction machine has a great impact on the structure, and the compaction near the structure is not good. If it is in place, there will be an enlarged space for tamping. At the same time, the traditional tamping machine is likely to cause interlayer slippage and separation caused by layered compaction, resulting in low tamping quality, slow construction progress, and increased construction costs. question

Method used

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  • Method for performing backfilling and hydraulic ramming on stage back of bridges and culverts
  • Method for performing backfilling and hydraulic ramming on stage back of bridges and culverts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 Shown, the present invention selects the backfill layer of sandy soil and fine-grained soil, comprises the following steps:

[0032] Step 1. Preparatory work before tamping:

[0033] A1. The construction surface must be leveled with a bulldozer before tamping, and then rolled by a road roller, and inspected according to the compaction standards and flatness required by the design, and repeated leveling and rolling for the construction surface that does not meet the design requirements until it meets the design It is required that when the construction surface is relatively dry, it is necessary to spray an appropriate amount of water to prevent the surface from becoming dusty, which will affect the transfer of energy to the deep layer;

[0034] A2. Release the operating points on the construction surface after passing the inspection. When laying out the operating points, the gap-type operating points are arranged. The gap-type operating points are arran...

Embodiment 2

[0045] The difference from Example 1 is that when the backfill layer of gravel and granular soil is selected, due to the small deformation of the gravel and granular soil, the gap-type arrangement operation points in step A2 are 30cm apart from the edge of each operation point, and are arranged in an equilateral triangle. , the distance between the working point on the side near the back of the platform and the back of the platform is 50cm; in step B1, repeat 5 groups, and in step B2, when the difference in relative settlement between the fifth group and the fourth group is less than 10mm, stop at this point According to the construction, the compaction coefficient within the depth range of 1m below the construction surface is 0.94, and the K30 value is 134Mpa / m.

Embodiment 3

[0047] Such as figure 2 As shown, on the basis of Embodiment 1, the following improvements have been made: the ramming plate includes a first ramming plate 10 and a second ramming plate 20, the first ramming plate 10 is a conical structure, and the middle part of the first ramming plate 10 is provided with Step hole 12, buffer pad 11 on the step surface of step hole 12, the cross-section of the second tamping plate 20 is T-shaped, the second tamping plate 20 is sleeved in the step hole 12, the top surface of the second tamping plate 20 and the rammer 30 is fixedly connected and the thickness of the second tamping plate 20 is equal to the sum of the thickness of the first tamping plate 10 and the deformation of the buffer pad 11 . When the rammer hits, the second ramming plate 20 first moves downward, and the second ramming plate 20 then transmits the force to the first ramming plate 10 through the buffer pad 11, and the deformation process of the first ramming plate 10 occurs...

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Abstract

The invention discloses a method for performing backfilling and hydraulic compaction on the stage back of bridges and culverts, and belongs to the technical field of backfilling construction of the stage back of the bridges and culverts. The method for performing backfilling and hydraulic compaction on the stage back of the bridges and culverts comprises the following steps that step 1, preparingwork before tamping is carried out; specifically, A1, a construction surface is leveled and rolled; A2, operation point layout is carried out, numbering and elevation measurement are carried out; A3,a rammer compactor is installed, a compaction plate is fixed to the lower part of a rammer; step 2, compaction work is carried out; specifically, B1, the rammer compactor is in place, every three hammers are taken as a group, and the settlement of each group is measured; B2, N groups of compaction is repeated; and B3, a machine is moved to the next operation point; step 3, the compaction surface is leveled after all the compaction points are rammed; and step 4, quality inspection is carried out. Compared with the traditional dynamic compaction technology, the method for performing backfillingand hydraulic compaction on the stage back of the bridges and culverts is small in an acting force peak value, high in striking frequency, soft in action and not prone to shearing a filling layer streamline; compared with vibration compaction technology, the compaction energy is high, penetration ability is high and uniform, impact depth is large, and relatively uniform compactness can be obtainedin a larger depth range. The method for performing backfilling and hydraulic compaction on the stage back of the bridges and culverts has the advantages of high strength, high efficiency, low energyconsumption, low noise, energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of backfill construction of bridge and culvert abutments, and in particular relates to a method for backfilling bridge and culvert abutment backfills by hydraulic pressure. Background technique [0002] At present, during the backfill construction of the bridge and culvert abutment, due to the influence of the narrow working face and the safety distance from the structure, the vibratory roller is not in place, and the dynamic compaction machine has a great impact on the structure, and the compaction near the structure is not good. If it is in place, there will be an enlarged space for tamping. At the same time, the traditional tamping machine is likely to cause interlayer slippage and separation caused by layered compaction, resulting in low tamping quality, slow construction progress, and increased construction costs. question. Contents of the invention [0003] The present invention aims to solve the de...

Claims

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Application Information

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IPC IPC(8): E02D3/046
CPCE02D3/046
Inventor 肖来兵陈宇华陶家长
Owner CHINA MCC17 GRP
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