CN216864875U - A light culvert roadbed structure for controlling difference subsides - Google Patents
A light culvert roadbed structure for controlling difference subsides Download PDFInfo
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- CN216864875U CN216864875U CN202123114370.2U CN202123114370U CN216864875U CN 216864875 U CN216864875 U CN 216864875U CN 202123114370 U CN202123114370 U CN 202123114370U CN 216864875 U CN216864875 U CN 216864875U
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Abstract
The utility model discloses a light culvert roadbed structure for controlling differential settlement, which is made of foam light soil; the soil roadbed structure comprises a first light filling body, a second light filling body, a third light filling body and a fourth light filling body, wherein the first light filling body, the second light filling body, the third light filling body and the fourth light filling body are sequentially arranged between a culvert and a soil roadbed structure, and the fourth light filling body is arranged above the culvert, and the density of the fourth light filling body is equal to the density of the first light filling body which is less than the density of the second light filling body which is less than the density of the third light filling body. According to the utility model, the light filling bodies with different densities are adopted to construct a continuous transition light roadbed structure between the rigid culvert structure and the soil roadbed, so that differential settlement of the transition section of the traditional culvert and the roadbed is avoided in the long-term service process, and the driving comfort and the safety of the roadbed at the transition section are improved.
Description
Technical Field
The utility model relates to a road subgrade structure, in particular to a light culvert subgrade structure for controlling differential settlement.
Background
The culvert is an interchange channel arranged below a roadbed and is mainly used for draining water along the highway engineering, crossing natural valley depression and passing pedestrians and vehicles. Culvert engineering usually accounts for more than 60% of the total number of highway bridge engineering and is an important accessory structure of a roadbed. Because the culvert generally adopts a prefabricated or cast-in-place concrete structure, the difference between the rigidity of the culvert and the roadbed on the two sides is larger, the culvert and the roadbed on the two sides are easy to generate larger differential settlement under the action of long-term vehicle load, and the driving comfort and the safety are seriously influenced. The traditional culvert platform back backfill adopts a material with natural gradation or good water stability, such as gravel soil, sand soil or a mixture of gravel and fine soil, and the filling compaction degree is not less than 96%. However, because the construction space of the platform back is limited, a small machine is generally adopted for vibration rolling, and the filling compactness often cannot meet the design requirement, the backfill soil body still inevitably undergoes settlement deformation under the long-term loading effect after construction is finished, so that the differential settlement between the platform back backfill soil body and the culvert structure is caused, and the driving safety is seriously influenced.
The foamed light soil is a novel light backfill material with self-hardening, fluidity and light weight, and is widely applied to backfill projects such as roadbeds, mine roadways, municipal pipe galleries and the like at present. A culvert backfilling method by adopting different foam light materials is respectively disclosed in a patent 'a high-fill culvert load-reducing construction method based on two-ash soil and waste tires' (application number 201810066038.7) and a patent 'a platform back backfilling structure layer for preventing the culvert from jumping over vehicles' (CN 201721322955.4). The adoption of the foam light soil for culvert backfilling can greatly reduce the settlement of a backfilled roadbed structure, and has a relatively obvious effect on solving the problem of differential settlement between the culvert and the common soil roadbed. But the common soil roadbed filling still generates settlement under the long-term load and the environment action (the settlement deformation allowable value of the common roadbed in the current specification is 50 cm); and the settlement deformation of the culvert section roadbed is almost zero due to the adoption of the foam light soil with the volume weight of only common roadbed filler 1/3, so that the differential settlement between the culvert section roadbed and the common roadbed is generated, a new 'vehicle jumping' problem is caused, and the deformation continuous transition between a rigid culvert structure and a flexible common roadbed cannot be realized.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a light culvert roadbed structure for controlling differential settlement, which can effectively avoid overlarge differential settlement and solve the problem of bumping at the bridge head.
In order to solve the above technical problems, the present invention provides a lightweight culvert roadbed structure for controlling differential settlement, which is made of foamed lightweight soil; the novel soil roadbed structure comprises a first light filling body, a second light filling body, a third light filling body and a fourth light filling body, wherein the first light filling body, the second light filling body, the third light filling body and the fourth light filling body are sequentially arranged between a culvert and a soil roadbed structure, and the fourth light filling body is arranged above the culvert, and has the density that is equal to the density of the first light filling body and less than the density of the second light filling body and less than the density of the third light filling body.
As an improvement of the above technical solution, geogrids are arranged in the first lightweight filling body and the fourth lightweight filling body.
As an improvement of the above technical scheme, a plurality of layers of first steps are arranged on one side of the soil roadbed close to the third light filling body, and the third light filling body is in lap joint with the soil roadbed through the first steps.
As an improvement of the technical scheme, the height of the first step is more than or equal to 1m, and the height-to-width ratio is 1: (1 to 1.5)
As an improvement of the above technical solution, the first light casting body includes a plurality of casting layers, and the width of the plurality of casting layers gradually increases from the bottom to the top of the first light casting body.
As an improvement of the above technical solution, the second lightweight casting body includes a plurality of second steps, and the second steps of each layer have the same width; the height of the second step is more than or equal to 1m, and the height-width ratio of the second step is 1: (2-3).
As an improvement of the above technical solution, the third lightweight casting body includes a plurality of third steps, and the third steps of each layer have the same width; the height of the third step is more than or equal to 1m, and the height-width ratio of the third step is 1: (3-4).
As an improvement of the technical scheme, the pouring layer, the second step and the third step are respectively provided with an anchoring piece.
As an improvement of the above technical scheme, the culvert foundation layer is characterized by further comprising a gravel cushion layer and a culvert foundation layer, wherein the gravel cushion layer is arranged below the second light filling body and the third light filling body, and the culvert foundation layer is arranged below the culvert and the first light filling body.
The implementation of the utility model has the following beneficial effects:
1. according to the light culvert roadbed structure, the first light filling body, the second light filling body and the third light filling body which are different in density are constructed between the culvert and the soil roadbed, so that the continuity and uniformity of settlement deformation of the culvert transition section roadbed under the long-term vehicle load action are ensured, excessive differential settlement is avoided, and the driving safety is ensured.
2. The lightweight culvert roadbed structure is made of foamed lightweight soil, the density of the lightweight culvert roadbed structure is only 1/3-1/2 of the traditional roadbed filling material, the overlying load can be obviously reduced when roadbed filling is carried out, and the settlement deformation of a transition section roadbed under the load action is reduced; meanwhile, the foamed lightweight soil has good fluidity and self-compactness, rolling compaction is not needed when the culvert is backfilled, construction is simple and convenient, and the construction period is shortened.
Drawings
Fig. 1 is a schematic structural view of a lightweight culvert subgrade structure for controlling differential settlement in one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It is only noted that the utility model is intended to be limited to the specific forms set forth herein, including any reference to the drawings, as well as any other specific forms of embodiments of the utility model.
Referring to fig. 1, the present embodiment provides a lightweight culvert roadbed structure for controlling differential settlement, including a first lightweight filling 3, a second lightweight filling 4, a third lightweight filling 5 and a fourth lightweight filling 6 arranged above a culvert 1, which are arranged between the culvert 1 and the soil roadbed structure 2 in sequence; the density of the fourth light filling 6 is equal to the density of the first light filling 3 which is less than the density of the second light filling 4 which is less than the density of the third light filling 5, and based on the roadbed structure with the structure, filling bodies with different densities are constructed between the culvert 1 and the soil roadbed 2, so that the continuity and uniformity of the settlement deformation of the light roadbed structure are effectively improved. Wherein, each side of culvert 1 all sets up first light filler 3, second light filler 4, third light filler 5, and the light building body of different homonymies is for using the central plane of culvert to be the plane of symmetry.
Specifically, the wet density of the fourth light filler 6 and the first light filler 3 is 500-700 kg/m328 days, pouring the lightweight foam soil with unconfined compressive strength of 0.6-0.9 MPa; the wet density of the second light filling 4 is 700-900 kg/m328 days, pouring the lightweight foam soil with unconfined compressive strength of 0.8-1.0 MPa; the wet density of the third light filling 4 is 800-1000 kg/m3And 28 days, pouring the lightweight foam soil with unconfined compressive strength of 1.0-1.3 MPa. The foam light soil is adopted for pouring, so that the settlement and deformation of the roadbed structure can be reduced, and the construction is simple.
Wherein, the soil roadbed 2 is equipped with a plurality of first steps 21 near one side of third light filling body 5, and third light filling body 5 passes through first step 21 and soil roadbed 2 overlap joint. Wherein, the height of the first step 21 is more than or equal to 1m, specifically 1-2.5 m. Height H of first step 2121And width (W)21) The ratio (aspect ratio) is 1: (1-1.5).
Wherein the first lightweight casting 3 comprises a multilayer casting layer 31. Specifically, in the embodiment, five casting layers 31 are provided, and the height of each casting layer 31 is greater than or equal to 1m, specifically 1-2.5 m. Furthermore, an anchoring element (not shown in the figures) is provided on the casting layer 31, which anchoring element is arranged on the side of the second step 41 close to the second lightweight casting 4, i.e. on the inner side of the casting layer 31. By means of the anchoring element, the connection stability between the first light cast body 3 and the second light cast body 4 can be effectively improved.
Wherein the second lightweight casting 4 comprises a multilayer second step 41. Specifically, in the embodiment, five second steps 41 are provided, and the height of each second step 41 is greater than or equal to 1m, specifically 1 to 2.5 m. The aspect ratio of the second step 41 is 1: (2-3). Further, an anchor (not shown in the figures) is provided on the second step 41, the anchor being provided on a side of the third step 51 adjacent to the third lightweight casting body 5, i.e. inside the second step 41. By means of the anchoring element, the connection stability between the second light cast body 4 and the third light cast body 5 can be effectively improved.
The third light casting body 5 includes a plurality of layers of third steps 51, specifically, in this embodiment, five layers of third steps 51 are provided, and the height of each layer of third steps 51 is greater than or equal to 1m, specifically, 1-2.5 m. The aspect ratio of the third step 51 is 1: (2-3). Further, an anchor (not shown in the drawings) is provided on the third step 51 of the third lightweight fill 5, and the anchor is provided on the side of the first step 21 close to the soil roadbed 2, that is, on the inner side of the third step 51. Through the anchoring member, the connection stability between the third light casting body 5 and the soil roadbed 2 can be effectively improved.
Specifically, in the present embodiment, geogrids (not shown in the drawings) are provided in both the first lightweight aggregate 3 and the fourth lightweight aggregate 6.
Specifically, in this embodiment, the lightweight culvert roadbed structure further includes a gravel cushion layer 7 and a culvert foundation layer 8, the gravel cushion layer 7 is disposed below the second lightweight filling 4 and the third lightweight filling 5, and the culvert foundation layer 8 is disposed below the culvert 1 and the first lightweight filling 3.
The construction method of the light culvert roadbed structure for controlling differential settlement comprises the following steps:
(1) clearing the surface of the original ground, clearing accumulated water, barriers and the like on the surface of the ground, leveling and rolling the surface of the ground to ensure the bearing capacity of the substrate;
(2) paving a broken stone cushion layer 7 on the original substrate, wherein the thickness of the cushion layer is not less than 15 cm;
(3) step excavation is carried out on one side, close to the culvert 1, of the original roadbed to obtain a first step 21;
(4) the roadbed structure is poured in layers according to the height direction of the roadbed, the single-layer pouring height is less than or equal to 0.8m, and the single-layer pouring area is less than or equal to 400m2；
Specifically, a third lightweight filling 5 (wet density of 800-1000 kg/m) is poured at the same time3) A second light filling 4 (wet density of 700-900 kg/m)3) A first light filling body 3 (wet density is 500-700 kg/m)3) The first layer of (a); the second and third layers … … of each lightweight fill are then poured simultaneously in sequence until the design elevation is reached. It should be noted that when the last step of the first lightweight filling body 3 is poured, the fourth lightweight filling body 6 is poured at the same time; further, when the layers of the first lightweight filler 3 and the fourth lightweight filler 6 are poured, geogrids are placed.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the utility model, and these modifications and decorations are also regarded as the protection scope of the present invention.
Claims (9)
1. A light culvert roadbed structure for controlling differential settlement is made of foam light soil; the lightweight culvert roadbed structure is characterized by comprising a first lightweight filling body, a second lightweight filling body, a third lightweight filling body and a fourth lightweight filling body, wherein the first lightweight filling body, the second lightweight filling body, the third lightweight filling body and the fourth lightweight filling body are sequentially arranged between a culvert and the soil roadbed structure, and the fourth lightweight filling body is arranged above the culvert, and has the density that the density of the first lightweight filling body is less than that of the second lightweight filling body and less than that of the third lightweight filling body.
2. The lightweight culvert subgrade structure for controlling differential settlement of claim 1, wherein geogrids are provided in both the first lightweight fill and the fourth lightweight fill.
3. The lightweight culvert subgrade structure for controlling differential settlement of claim 1, characterized in that one side of the soil subgrade near the third lightweight filling is provided with a plurality of layers of first steps, and the third lightweight filling is overlapped with the soil subgrade through the first steps.
4. The lightweight culvert subgrade structure for controlling differential settlement of claim 3, wherein the height of the first step is more than or equal to 1m, and the height-to-width ratio is 1: (1-1.5).
5. The light weight culvert subgrade structure for controlling differential settlement of claim 1, wherein the first light weight casting comprises multiple casting layers, the width of the multiple casting layers gradually increases from the bottom to the top of the first light weight casting.
6. The lightweight culvert subgrade structure for controlling differential settlement of claim 1, wherein the second lightweight casting comprises a plurality of layers of second steps, each layer of second steps having the same width; the height of the second step is more than or equal to 1m, and the height-width ratio of the second step is 1: (2-3).
7. The lightweight culvert subgrade structure for controlling differential settlement of claim 1, wherein the third lightweight casting comprises a plurality of layers of third steps, each layer of third steps having the same width; the height of the third step is more than or equal to 1m, and the height-width ratio of the third step is 1: (3-4).
8. The lightweight culvert substructure for controlling differential settlement of claim 5, wherein anchors are provided on the casting layer.
9. The lightweight culvert roadbed structure for controlling differential settlement of claim 1, further comprising a gravel cushion layer and a culvert foundation layer, wherein the gravel cushion layer is provided under the second lightweight filling and the third lightweight filling, and the culvert foundation layer is provided under the culvert and the first lightweight filling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123114370.2U CN216864875U (en) | 2021-12-10 | 2021-12-10 | A light culvert roadbed structure for controlling difference subsides |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123114370.2U CN216864875U (en) | 2021-12-10 | 2021-12-10 | A light culvert roadbed structure for controlling difference subsides |
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| CN216864875U true CN216864875U (en) | 2022-07-01 |
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| CN202123114370.2U Active CN216864875U (en) | 2021-12-10 | 2021-12-10 | A light culvert roadbed structure for controlling difference subsides |
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- 2021-12-10 CN CN202123114370.2U patent/CN216864875U/en active Active
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