A method of excavating a roadbed step

Abstract

The application provides a kind of roadbed step excavation method, relate to roadbed excavation technical field.The roadbed step excavation method, including the following steps: step one, preparation: construction setting-out is carried out near the roadbed, and temporary protection wall is installed on both sides of the roadbed road;Step two, roadside cleaning: construction personnel cooperate with construction machinery to clean bottom, paving, leveling, slope repair, and the structure that influences step excavation construction is removed;Step three, compaction slope surface;Step four, layer by layer excavation;Step five: after excavation treatment: after step excavation, the moisture content and compaction degree of the old roadbed step bottom filler should be detected in time, if the moisture content of the filler is too large or the compaction degree is obviously insufficient, the filler should be replaced and treated.The roadbed excavation method is constructed on the roadbed slope surface for multiple times, effectively reinforcing the slope surface, thereby effectively preventing the collapse of the slope surface, facilitating the subsequent step excavation work, and greatly improving the safety of the step excavation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of roadbed excavation, in particular to a roadbed step excavation method. BACKGROUND

[0002] In road construction, embankment as the foundation not only needs to bear the load of itself and the road surface, but also is the main body of highway load bearing. For the highway, the strength and stiffness of the embankment have a direct impact on its service life and quality.

[0003] In the construction process, high fill embankment is often encountered, and such embankment is prone to settlement deformation problems, and experience needs to be summarized in long-term practice. The existing excavation method is complex, and collapse is prone to occur during the construction process of the roadbed step, and the safety is low. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the shortcomings of the prior art, the present application provides a roadbed step excavation method, which solves the problems of complex excavation method, easy collapse during the construction process of the roadbed step, and low safety.

[0006] (II) Technical solutions

[0007] In order to achieve the above purpose, the present application is realized by the following technical solutions: a roadbed step excavation method, comprising the following steps:

[0008] Step 1, preparation: laying out near the construction roadbed, and installing temporary protective walls on both sides of the roadbed road;

[0009] Step 2, roadside cleaning: construction personnel cooperate with construction machinery to clean the bottom, paving, leveling, slope repair, and remove the structure affecting the step excavation construction;

[0010] Step 3, compacting the slope surface; first, using the bulldozer to roll from the edge of the roadbed to the inside, dumping fillers on the slope surface, and leveling with the bulldozer, and then rolling from the edge of the roadbed to the inside through the bulldozer; then, the slope surface is weakly rolled by the road roller; finally, the slope surface is finally pressed by the bulldozer;

[0011] Step 4, layer-by-layer excavation: from the inside of the soil shoulder to the slope foot, then excavate the steps layer by layer from bottom to top; excavate one step and fill one step in time, the step height is 1 meter, and the width is 1 meter; the height of the upper two steps is adjusted according to the filling height, and the height of the uppermost step is not less than 0.8 meters, and the inside of each step is rolled by the steel wheel road roller or rammed by the small machine tool to ensure the compaction degree of the inside of the step. After excavation, the excavation position is rechecked to ensure the accuracy of excavation;

[0012] Step five: after the excavation of the step, the moisture content and compaction degree of the old roadbed step bottom filling material are detected in time, and if the moisture content of the filling material is too large or the compaction degree is obviously insufficient, the filling material is replaced.

[0013] Preferably, the installation step of the temporary protection wall in step one is as follows: a cement crash barrier with a height of 2m is arranged at the center line of the emergency lane, yellow and black alternating reflective paint is brushed on the outer side wall of the cement crash barrier, an I-steel is buried at the removal line of the highway, a bamboo plywood is connected with the I-steel through a wire at the inner side of the I-steel, and a color steel tile is laid at the outer side of the I-steel.

[0014] Preferably, the slope of the step in step four is towards the inner side of the roadbed and the slope is set to be between 2° and 4°.

[0015] Preferably, during the step excavation process, the base, slope foot and the range affecting the stability of the roadbed should not be soaked in water, and when the embankment is built beside the mountain, the surface and underground water should be prevented from seeping into each part of the embankment structure.

[0016] Preferably, in step three, when the construction is carried out on the unstable ground slope and the slope prone to collapse and sliding, the pedestrian way should be more than 5m away from the slope foot line of the filling, and warning signs should be set.

[0017] Preferably, in step two, the personnel for cleaning, paving, leveling and slope repairing in cooperation with the mechanical operation should work outside the mechanical rotation radius.

[0018] Preferably, in step two, the structures affecting the construction include but are not limited to the bridge taper slope, the eight-shaped wall of the culvert and the roadside guardrail.

[0019] Preferably, in step three, the gap between the slope surface and the compaction should be layered and watered: after the first rolling is completed, the roadbed surface is watered by a watering cart; in sunny days, the filling before paving is watered, and the slope surface after the final pressing of the bulldozer is watered.

[0020] (Three) beneficial effects

[0021] The present application provides a roadbed step excavation method. It has the following beneficial effects:

[0022] 1. The roadbed excavation method is constructed to compact the roadbed slope surface multiple times, effectively reinforcing the slope surface, thereby effectively preventing the collapse of the slope surface, facilitating subsequent step excavation work, and greatly improving the safety of step excavation.

[0023] 2. The roadbed excavation method has relatively simple construction procedures, facilitating on-site construction organization and management, reducing mutual interference between multiple processes, having a faster construction speed, high mechanical utilization rate, greatly saving the construction period and reducing the management cost.

[0024] 3、The temporary protection wall can effectively isolate the road from the construction range on both sides, avoid the adverse effects of construction machinery on the normal use of the road, and effectively improve the safety of the road. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0026] Embodiment:

[0027] The present embodiment provides a roadbed step excavation method, comprising the following steps:

[0028] Step one, preparation: after obtaining the construction approval, the construction lofting is carried out, and temporary protection walls are installed on both sides of the road. The installation steps of the temporary protection wall are as follows: a 2m high cement crash barrier is set in the emergency lane centerline, and yellow and black alternating reflective paint is brushed on the outer side wall of the cement crash barrier; an I-steel is buried at the expressway excavation line, a bamboo plywood is connected with the I-steel through a wire on the inner side of the I-steel, and a color steel tile is laid on the outer side of the I-steel. The temporary protection wall can effectively isolate the road from the construction range on both sides, avoid the adverse effects of construction machinery on the normal use of the road, and effectively improve the safety of the road.

[0029] Step two, roadside cleaning: cooperate with mechanical operation to clean the bottom, paving, leveling, and slope repair, and remove the structures that affect the step excavation construction. The personnel cooperating with the mechanical operation to clean the bottom, paving, leveling, and slope repair should work outside the mechanical rotation radius. The structures affecting the construction include but are not limited to bridge taper slope, culvert eight-character wall, and roadside guardrail.

[0030] Step three, compacting the slope; first, using a bulldozer to roll from the roadbed edge to the inside, dumping fillers on the slope, and then using a bulldozer to roll from the roadbed edge to the inside; then, using a road roller to weakly vibrate and compact the slope; finally, using a bulldozer to compact the slope; when constructing on unstable ground slopes and slopes prone to collapse and sliding, the sidewalk should be at least 5m away from the slope foot line, and warning signs should be installed, and the gap between the slope compaction should be layered with water; after the first rolling, the roadbed surface is sprayed by a water spraying vehicle; in sunny weather, the fillers before paving are sprayed, and the slope after the bulldozer compaction is sprayed; the roadbed excavation method can effectively prevent the collapse of the slope, facilitate the subsequent step excavation work, and greatly improve the safety of the step excavation.

[0031] Step four, excavating layer by layer: from the inside of the shoulder to the slope foot, and then excavating the steps layer by layer from bottom to top; excavate one step and fill one step at the same time, the step height is 1 meter, and the width is 1 meter, the slope of the step in step four is towards the inside of the roadbed and the slope is set to be between 2° to 4°, the height of the upper two steps is adjusted according to the filling height, ensuring that the height of the uppermost step roadbed part is not less than 0.8 meters, and each step inside is rolled by a steel wheel roller or tamped by a small machine to ensure the compaction degree of the inside of the step roadbed, and the excavation position is also reviewed after excavation to ensure the accuracy of the excavation, and there should be no water immersion in the base, slope foot and range affecting the stability of the roadbed during the excavation process. When building a road embankment beside a mountain, the surface and underground water should be prevented from seeping into the structure of the embankment.

[0032] Step five: post-excavation treatment: after the step excavation, the water content and compaction degree of the old roadbed step bottom filler should be detected in time, and if the water content of the filler is too large or the compaction degree is obviously insufficient, the filler should be replaced.

[0033] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A method of excavating a roadbed step, characterized by, It comprises the following steps: Step one, preparation: construction setting-out is carried out near the construction roadbed, and temporary protective walls are installed on both sides of the roadbed road, the installation steps of the temporary protective walls are as follows: a 2m high cement crash barrier is arranged in the center line of the emergency lane, and yellow and black alternating reflective paint is brushed on the outer side wall of the cement crash barrier, an I-steel is buried at the excavation line of the expressway, a bamboo plywood is connected with the I-steel through a wire on the inner side of the I-steel, and a color steel tile is laid on the outer side of the I-steel; Step two, roadside cleaning: construction personnel cooperate with construction machinery to clean the bottom, paving, leveling, and slope repairing, and the structures affecting the step excavation construction are removed, and the personnel cooperating with the machinery operation for cleaning the bottom, paving, leveling, and slope repairing should work outside the machinery rotation radius; Step three, compaction slope: first, a bulldozer is used to roll from the roadbed edge to the inner side, filler is poured on the slope, and the bulldozer is used for leveling, and then the bulldozer is used for rolling from the roadbed edge to the inner side; then, a road roller is used for weak vibration compaction of the slope; finally, the bulldozer is used for final compaction; the slope compaction gap should be watered in layers: after the first rolling is completed, the roadbed surface is watered by a watering cart; the filler before paving is watered in sunny weather, and the slope surface after the bulldozer final compaction is watered; Step four, layer-by-layer excavation: from the inner side of the earth road shoulder to the slope foot at a 1:1 slope, and then excavate the steps layer by layer from bottom to top; excavate one step and fill one step at the same time; the height of the upper two steps is adjusted according to the filling height, and the height of the uppermost step is not less than 0.8 meters, and the inner side of each step is rolled by a steel wheel roller or tamped by a small machine tool to ensure the compaction degree of the inner side of the roadbed, and the excavation position is rechecked after excavation to ensure the accuracy of excavation; Step five: post-excavation treatment: the moisture content and compaction degree of the old roadbed step bottom filler after step excavation should be detected in time, and if the moisture content of the filler is too large or the compaction degree is obviously insufficient, the filler should be replaced.

2. A method of excavating a roadbed step according to claim 1, wherein: The slope of the step in step four is towards the inner side of the roadbed and the slope is set to be between 2° and 4°.

3. A method of excavating a roadbed step according to claim 1, wherein: During the step excavation process, the base, slope foot and the range affecting the stability of the roadbed should not be soaked with water, and when the embankment is built beside the mountain, the surface and underground water should be prevented from seeping into each part of the embankment structure.

4. The method of claim 1, wherein: In step three, when construction is carried out on unstable ground slopes and slopes prone to collapse and sliding, the sidewalk should be at least 5m away from the filling slope foot line, and warning signs should be set on the slope.

5. A method of excavating a roadbed step according to claim 1, wherein: The structures affecting construction in step two include bridge taper slope, culvert eight-character wall and roadside guardrail.