CN211199940U - Prevent reinforced earth retaining wall roadbed structure of bridgehead car skip - Google Patents
Prevent reinforced earth retaining wall roadbed structure of bridgehead car skip Download PDFInfo
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- CN211199940U CN211199940U CN201921204407.0U CN201921204407U CN211199940U CN 211199940 U CN211199940 U CN 211199940U CN 201921204407 U CN201921204407 U CN 201921204407U CN 211199940 U CN211199940 U CN 211199940U
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Abstract
The utility model discloses a prevent reinforced earth retaining wall roadbed structure of bridge head bump, be provided with changeover portion (3) between road bed filling (1) and abutment (2), changeover portion (3) including road surface structure (4), attachment strap (5), three-dimensional geogrid (6) and reinforced earth retaining wall (7), road surface structure (4) be located the upper surface of changeover portion (3), attachment strap (5) be located road surface structure (4) with abutment (2) between, reinforced earth retaining wall (7) be located three-dimensional geogrid (6) with abutment (2) between; the method overcomes the defects that the settlement of the bridgehead embankment is larger than that of the abutment, the settlement difference between the two is caused, and vehicles bump and jump when passing through the bridgehead embankment in the prior art, and has the advantages of reducing the lateral displacement of roadbed filling and coordinating the settlement difference between the roadbed and the abutment.
Description
Technical Field
The utility model relates to road engineering technical field, more specifically are a prevent reinforced earth retaining wall roadbed structure of bridgehead jumping.
Background
The abutment is a rigid structure, and the lower part of the abutment is generally provided with a pile foundation, so that the settlement of the abutment is very small. The embankment and the foundation are flexible and have large plastic deformation under the action of load, so that the settlement of the bridge head embankment is larger than that of the abutment, the settlement difference between the embankment and the abutment is caused, and the vehicle bumps and jumps when passing. The specifications require that a bridgehead subgrade transition be provided to address this differential settlement problem.
The existing design code of urban road subgrade (CJJ 194-2013) in China proposes that the joints of the embankment, the abutment and the transverse structures (box culvert and underpass) are provided with transition sections, and the requirement of the design code of highway subgrade (JTG D30-2015) is also the same, but the specific practice of the transition sections is not clear.
An example of a design drawing for treating a bridge head roadbed is provided in the current design documentation method for basic construction project of highway engineering (No. 2007 358) in China, wherein a transition section of the bridge head roadbed is filled with gravel, and two layers of geocell are arranged at the top of the roadbed. This example is applicable to a general filling subgrade, and does not describe how the bridge head subgrade is connected with the abutment under the condition that the reinforced retaining wall is arranged.
The existing technical specification for the application of geosynthetics for roads (JTG/T D32-2012) in China proposes that the geosynthetics can be used for preventing the uneven settlement of the roadbed at road sections such as the joints of the roadbed and abutment structures, and provides a method for connecting the geosynthetics with abutments in various forms, but the method is only suitable for general filling roadbeds, and a transition section method for connecting the abutment structures with the roadbeds at the head of the bridge under the condition that reinforced retaining walls are arranged is not described.
The concrete structural research on how the reinforced retaining wall subgrade is connected with the abutment to process the bump at the bridge head is not common at home and abroad.
Disclosure of Invention
An object of the utility model is to overcome the weak point of above-mentioned background art, and provide a prevent reinforced earth retaining wall roadbed structure of bridgehead bump car.
The utility model aims at being implemented through the following technical scheme: a reinforced earth retaining wall roadbed structure for preventing vehicle bump at the bridge head is characterized in that a transition section is arranged between roadbed filling and an abutment, the transition section comprises a pavement structure, a butt strap, a three-dimensional geogrid and a reinforced earth retaining wall,
the pavement structure is positioned on the upper surface of the transition section, the butt strap is positioned between the pavement structure and the abutment, and the reinforced earth retaining wall is positioned between the three-way geogrid and the abutment;
the reinforced earth retaining wall comprises a reinforced material, a unidirectional geogrid and a roadside retaining wall panel; reinforced materials are filled between the unidirectional geogrids on each layer, and the roadside retaining wall panels are positioned on the outer sides of the unidirectional geogrids.
In the above technical scheme: and a step filling body is arranged between the transition section and the roadbed filling.
In the above technical scheme: the distance between the three-dimensional geogrids on each layer is 45 meters, and fillers are filled between the three-dimensional geogrids on each layer.
In the above technical scheme: the reinforced material is made of graded broken stones, the compactness is not less than 96%, and the compactness of the transition section is not less than 96%.
In the above technical scheme: the ultimate tensile strength of the three-way geogrid is more than 50kN/m, and the tensile strength at 2% elongation is more than 20 kN/m; the ultimate tensile strength of the unidirectional geogrid is more than 70 kN/m.
In the above technical scheme: the length of the transition section is 2-3 times of the elevation from the top surface elevation of the pavement structure to the elevation of the original ground.
In the above technical scheme: the width of the step filling body is 1.5 meters, and the height of the step filling body is 1 meter.
The utility model has the advantages of as follows: 1. the utility model discloses all adopt the graded broken stone to fill behind the reinforced earth retaining wall of setting in the well changeover portion, and set up three-dimensional geogrid in the changeover portion beyond the one-way geogrid scope, wholly constitute graded broken stone + one-way geogrid + three-dimensional geogrid and constitute changeover portion reinforced subgrade structure, can reduce the lateral displacement that the subgrade packed, coordinate the settlement difference of subgrade and abutment.
Drawings
Fig. 1 is a schematic structural view of a longitudinal section of a bridgehead roadbed.
Fig. 2 is the utility model discloses well bridgehead roadbed planar structure schematic diagram.
In the figure: the roadbed filling 1, the abutment 2, the transition section 3, the pavement structure 4, the butt strap 5, the three-way geogrid 6, the reinforced earth retaining wall 7, the reinforced material 7.1, the one-way geogrid 7.2, the road side retaining wall panel 7.3 and the step filling body 8.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary; while the advantages of the invention will be apparent and readily appreciated by the description.
Referring to FIGS. 1-2: a reinforced earth retaining wall roadbed structure for preventing vehicle bump at the bridge head is characterized in that a transition section 3 is arranged between roadbed filling 1 and an abutment 2, the transition section 3 comprises a pavement structure 4, an attachment strap 5, a three-dimensional geogrid 6 and a reinforced earth retaining wall 7,
the pavement structure 4 is positioned on the upper surface of the transition section 3, the butt strap 5 is positioned between the pavement structure 4 and the abutment 2, and the reinforced earth retaining wall 7 is positioned between the three-way geogrid 6 and the abutment 2;
the reinforced earth retaining wall 7 comprises a reinforced material 7.1, a unidirectional geogrid 7.2 and a roadside retaining wall panel 7.3; reinforced materials 7.1 are filled between the unidirectional geogrids 7.2 of each layer, and the roadside retaining wall panels 7.3 are positioned on the outer sides of the unidirectional geogrids 7.2.
A step filling body 8 is arranged between the transition section 3 and the roadbed filling 1. The step filling can ensure that the lapping of the filler is formed between the transition section 3 and the roadbed filling 1, and the settlement of the newly filled transition section 3 is coordinated.
The distance between the three-dimensional geogrids 6 on each layer is 45 meters, and fillers are filled between the three-dimensional geogrids 6 on each layer. The three-dimensional geogrid 6 is arranged in the filler to form the reinforced earth filler, so that the uneven settlement of the filler in all directions can be reduced.
The reinforced material 7.1 is made of graded broken stones, the compactness is not less than 96%, and the compactness of the transition section 3 is not less than 96%. The use of higher compaction standards can reduce settling in the transition section 3.
The ultimate tensile strength of the three-way geogrid 6 is more than 50kN/m, and the tensile strength at 2% elongation is more than 20 kN/m; the 7.2 ultimate tensile strength of the unidirectional geogrid is more than 70 kN/m. The lateral displacement of the roadbed filling can be limited, and the self settlement of the roadbed is reduced.
The maximum grain size of the graded broken stone is not more than 53mm, the crushing value is not more than 35%, the mud content is not more than 5%, and the grading composition requirements are shown in the following table.
The length of the transition section 3 is 2-3 times of the elevation of the top surface of the pavement structure 4 to the elevation of the original ground. The settlement of the bridge head roadbed can be controlled to gradually change in a longer range by adopting a certain transition section length, so that the change of the settlement tends to be smooth.
And (3) filling the road foundation behind the bridge in advance, excavating steps on the interface of the road foundation during construction of the transition section, wherein the width of the step filling body 8 is 1.5 meters, and the height of the step filling body is 1 meter.
The utility model also comprises a construction method that the range of the bridge head transition section 3 is determined according to the height of the roadbed filling 1 at the bridge abutment 2, the length of the transition section 3 (L in the figure) is 2-3 times of the filling height (H in the figure), the step-digging filling body 8 is carried out on the interface between the normal roadbed filling 1 and the transition section 3, and the unidirectional geogrid 7.2 of the reinforced earth retaining wall 7 is protected during construction.
The filling of the reinforced earth retaining walls 7, the three-dimensional geogrids 9 and the graded broken stones on the two sides of the roadbed filling 1 and the back of the abutment 2 is synchronously performed. The roadside reinforced earth retaining wall 7 and the unidirectional geogrids 7.2 of the reinforced earth retaining wall 7 on the back of the abutment 2 are vertically staggered in a layering mode, and reinforced materials 7.1 with certain thickness are arranged between two layers of grids in two directions at the overlapped position in a separating mode. The joint of the three-way geogrid 6 and the one-way geogrid 7.2 adopts a butt joint mode without lap joint.
The above-mentioned parts not described in detail are prior art.
Claims (7)
1. The utility model provides a prevent reinforced earth retaining wall roadbed structure of bridgehead car jump which characterized in that: a transition section (3) is arranged between the roadbed filling (1) and the abutment (2), the transition section (3) comprises a pavement structure (4), an attachment strap (5), a three-dimensional geogrid (6) and a reinforced earth retaining wall (7),
the pavement structure (4) is positioned on the upper surface of the transition section (3), the butt strap (5) is positioned between the pavement structure (4) and the abutment (2), and the reinforced earth retaining wall (7) is positioned between the three-way geogrid (6) and the abutment (2);
the reinforced earth retaining wall (7) comprises a reinforced material (7.1), a unidirectional geogrid (7.2) and a roadside retaining wall panel (7.3); reinforced materials (7.1) are filled between the unidirectional geogrids (7.2) on each layer, and the roadside retaining wall panels (7.3) are positioned on the outer sides of the unidirectional geogrids (7.2).
2. The reinforced earth retaining wall roadbed structure for preventing vehicle bump at the bridge head, according to claim 1, wherein: a step filling body (8) is arranged between the transition section (3) and the roadbed filling (1).
3. A reinforced earth retaining wall roadbed structure for preventing vehicle bump at the bridge head according to claim 1 or 2, wherein: the distance between the three-dimensional geogrids (6) on each layer is 45 meters, and fillers are filled between the three-dimensional geogrids (6) on each layer.
4. The reinforced earth retaining wall roadbed structure for preventing vehicle bump at the bridge head, according to claim 1, wherein: the reinforced material (7.1) is made of graded broken stones, the compactness is not less than 96%, and the compactness of the transition section (3) is not less than 96%.
5. The reinforced earth retaining wall roadbed structure for preventing vehicle bump at the bridge head according to claim 1 or 4, wherein: the ultimate tensile strength of the three-way geogrid (6) is more than 50kN/m, and the tensile strength at 2% elongation is more than 20 kN/m; the ultimate tensile strength of the unidirectional geogrid (7.2) is more than 70 kN/m.
6. The reinforced earth retaining wall roadbed structure for preventing vehicle bump at the bridge head, according to claim 5, wherein: the length of the transition section (3) is 2-3 times of the elevation from the top surface elevation of the pavement structure (4) to the elevation of the original ground.
7. The reinforced earth retaining wall roadbed structure for preventing vehicle bump at the bridge head, according to claim 2, wherein: the width of the step filling body (8) is 1.5 meters, and the height is 1 meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921204407.0U CN211199940U (en) | 2019-07-29 | 2019-07-29 | Prevent reinforced earth retaining wall roadbed structure of bridgehead car skip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921204407.0U CN211199940U (en) | 2019-07-29 | 2019-07-29 | Prevent reinforced earth retaining wall roadbed structure of bridgehead car skip |
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| Publication Number | Publication Date |
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| CN211199940U true CN211199940U (en) | 2020-08-07 |
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| CN201921204407.0U Active CN211199940U (en) | 2019-07-29 | 2019-07-29 | Prevent reinforced earth retaining wall roadbed structure of bridgehead car skip |
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| CN (1) | CN211199940U (en) |
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2019
- 2019-07-29 CN CN201921204407.0U patent/CN211199940U/en active Active
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