CN215629086U

CN215629086U - Road bridge transition section roadbed structure capable of preventing vehicle bump at bridge head by utilizing road dismantling and solid waste

Info

Publication number: CN215629086U
Application number: CN202122062191.2U
Authority: CN
Inventors: 朱旭飞; 赵丽君; 陈业文; 王绮烨; 王方婷
Original assignee: Shaoxing Chengtou Renewable Resources Co ltd; University of Shaoxing
Current assignee: Shaoxing Chengtou Renewable Resources Co ltd; University of Shaoxing
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-01-25
Anticipated expiration: 2031-08-30

Abstract

The utility model discloses a road and bridge transition section roadbed structure for preventing bump at the bridge head by utilizing the solid waste of road demolition, which sequentially comprises a ramming soil layer, a water absorption layer, a sand cushion layer, a base layer and a surface layer from bottom to top; the water absorption layer comprises expansion bags and gravel filled in gaps among the expansion bags; the base layer comprises large prefabricated recycled aggregate porous structure blocks and foam lightweight soil filled in holes of the large prefabricated recycled aggregate porous structure blocks. The utility model adopts the road demolition solid waste soil as the roadbed filler, namely the regenerated aggregate, has high utilization rate of regenerated resources and lower construction difficulty, can effectively reduce roadbed settlement and avoid the phenomenon of bumping at the bridge head.

Description

Road bridge transition section roadbed structure capable of preventing vehicle bump at bridge head by utilizing road dismantling and solid waste

Technical Field

The utility model relates to the technical field of road construction, in particular to a road-bridge transition section roadbed structure for preventing vehicle bump at the bridge head by utilizing road dismantling and waste fixing.

Background

The phenomenon of vehicle jump at the bridge head is easy to occur at the transition section of the road and bridge, and the reason for the phenomenon is that the roadbed is continuously sunk due to long-term load disturbance because the rigidity difference between the roadbed and the abutment is large. And the phenomenon of bumping at the bridge head is caused continuously due to differential settlement. The existing solution to the phenomenon has a good effect, but still has certain defects. For example, the transition section of the road and bridge is repeatedly compacted, but the porosity still cannot be completely eliminated, and the foundation still can be settled under the self weight of vehicles and fillers; the cement gravel filler with a large mixing amount is used, so that the rigidity of the roadbed can be greatly improved, but the foundation sinks due to self weight, and the settlement difference still occurs; the foundation can be constructed with certain difficulty when being reinforced, and the cost is high and the sedimentation control difficulty is high. Therefore, the traditional construction process has certain limitation, and the novel roadbed design structure is provided to the situation, so that the method has important significance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a road-bridge transition section roadbed structure for preventing vehicle bump at the bridge head by utilizing solid waste of road demolition, and aims to solve the problems in the prior art brought forward by the background technology.

The technical problem of the utility model is mainly solved by the following technical scheme: the method comprises the following steps of removing a solid waste roadbed structure at the transition section of a road bridge for preventing bumping at the bridge head by utilizing a road, and sequentially comprising a ramming soil layer, a water absorbing layer, a sand cushion layer, a base layer and a surface layer from bottom to top; the water absorption layer comprises expansion bags and gravel filled in gaps among the expansion bags; the base layer comprises large prefabricated recycled aggregate porous structure blocks and foam lightweight soil filled in holes of the large prefabricated recycled aggregate porous structure blocks.

Preferably, a modified emulsified asphalt adhesive layer is laid between the base layer and the surface layer.

Preferably, the base layer comprises an upper base layer and a bottom base layer, and geogrids are respectively arranged between the bottom base layer and the upper base layer and between the upper base layer and the modified emulsified asphalt adhesive layer.

Preferably, the expansion bags in the water absorption layer are distributed in an upper layer and a lower layer in a staggered mode.

Preferably, the expansion bags are arranged from dense to sparse along the direction that the bridge head points to the road.

Preferably, the sand cushion layer consists of granules.

Preferably, the organic granular material is natural gravel or coarse sand.

Preferably, the surface layer comprises an upper layer, a middle layer and a lower layer, wherein the upper layer is composed of fine-grain asphalt concrete, the middle layer is composed of medium-grain asphalt concrete, and the lower layer is composed of coarse-grain asphalt concrete.

Compared with the prior art, the utility model has the advantages that:

1. the utility model adopts the road demolition solid waste soil as the roadbed filler, namely the regenerated aggregate, has high utilization rate of regenerated resources and lower construction difficulty, can effectively reduce roadbed settlement and avoid the phenomenon of bumping at the bridge head.

2. The utility model prefabricates the large porous structure block in advance, places the large porous structure block in the base layer, and utilizes the foam light soil as the porous structure block hole filler, thereby reducing the dead weight of the base layer soil and reducing the axial pressure generated on the soil base.

3. The expansion bags arranged in the water absorption layer can prevent rainwater from entering the foundation and avoid foundation collapse caused by water, and meanwhile, the expansion bags are arranged from dense to sparse, so that a gradual change process for offsetting subgrade settlement can be formed.

Drawings

Fig. 1 is a schematic longitudinal section of a roadbed structure according to the utility model.

Fig. 2 is a schematic cross-sectional view of the base layer a-a of fig. 1.

Fig. 3 is a detailed cross-sectional view of the roadbed structure B-B of fig. 1.

In the figure: 1. tamping a soil layer; 2. a water absorption layer 21, an expansion bag 22 and gravel; 3. a sand cushion layer 31 with granules; 4. a base layer 41, an upper base layer 42, a subbase layer 43, foamed lightweight soil 44 and a large prefabricated regenerated aggregate porous structure block; 5. surface layer, 51, fine-grain asphalt concrete, 52, medium-grain asphalt concrete, 53, coarse-grain asphalt concrete; 6. modifying the emulsified asphalt adhesive layer; 7. geogrid.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further specifically described below by way of embodiments in combination with the accompanying drawings.

Example (b): the roadbed structure comprises a rammed earth layer 1, a water absorbing layer 2, a sand cushion layer 3, a base layer 4, a modified emulsified asphalt adhesive layer 6 and a surface layer 5 which are sequentially laid from bottom to top as shown in figures 1-3.

Wherein the rammed soil layer 1 is a plain soil rammed layer used for the surface of the foundation and is leveled by mechanical rolling; the ramming soil layer 1 has small internal porosity, so that rainwater infiltration can be prevented, and the foundation is prevented from sinking due to rainwater infiltration.

The water absorption layer 2 is laid to be 15cm thick and composed of expansion bags 21 and gravel 22, the expansion bags 21 are water-permeable woven plastic bags, and the expansion soil is filled in the expansion bags and resists road settlement by utilizing the water absorption expansion characteristic of the expansion soil. The expansion bag 21 is divided into an upper layer and a lower layer, the distribution form is staggered up and down, the arrangement is carried out from dense to sparse according to the direction pointing to the road along the bridge head, the gradual change process of counteracting settlement is formed, then the gravel 22 is filled in the gap, and the manual rolling and leveling are adopted.

The sand cushion layer 3 is laid with the thickness of 10cm and is composed of natural gravel, coarse sand and other granular materials 31; the sand cushion layer 3 has larger gaps, can cut off the rising of capillary water, can store water during freeze thawing and reduce frost heaving and settlement of the road surface.

The base layer 4 is divided into an upper base layer 41 and a lower base layer 42, and geogrids 7 are respectively paved between the upper base layer 41 and the lower base layer 42 and between the upper base layer 42 and the modified emulsified asphalt bonding layer 6. The upper base layer 41 is paved with the thickness of 24cm, the lower base layer 42 is paved with the thickness of 20cm, and respectively consists of large prefabricated regenerated aggregate porous structure blocks 44 and foam light soil 43, the large prefabricated regenerated aggregate porous structure blocks 44 are formed by combining mixture materials such as soil, stone and the like for removing solid wastes from roads, are prefabricated in factories to form porous structure blocks, and are transported to a road construction site for paving. The large prefabricated aggregate porous structure blocks 44 have good water permeability, and can effectively prevent the influence of rainwater on the base layer. In consideration of resource utilization and reduction of pressure on the foundation, the porous structure blocks 44 are made of the recycled aggregate having a large self weight, and the holes are filled with the foamed lightweight soil 43 having a light self weight and satisfying the roadbed strength.

The surface layer 5 is divided into an upper layer, a middle layer and a lower layer due to a structural layer which directly bears the repeated action of wheel load and the influence of natural factors, wherein the upper layer is composed of fine particle type asphalt concrete 51, the middle layer is composed of medium particle type asphalt concrete 52, and the lower layer is composed of coarse particle type asphalt concrete 53.

The thickness of the modified emulsified asphalt adhesive layer 6 is 1cm, and the spreading emphasis of the adhesive layer is thin and repeated; the modified emulsified asphalt bonding layer 6 mainly plays a role in bonding, and bonds the surface layer and the base layer into a whole.

The geogrid 7 is a glass fiber geogrid, and glass fiber alkali-free twistless roving is used as a main raw material and is laid in a unidirectional mode; the geogrid 7 can effectively improve the interlocking and meshing effects of the bearing surface and restrain the lateral displacement of the soil body.

When the roadbed structure of the embodiment is constructed, the concrete steps are as follows:

(1) the method is characterized in that the road and bridge transition section is dug and leveled in a mechanical and manual combined mode, then a layer of ramming soil layer 1 is laid, and mechanical rolling and ramming are carried out.

(2) Then the expansion bags 21 are longitudinally and alternately laid on the water absorption layer 2 in a layered and staggered manner, the expansion bags are transversely distributed from dense to sparse far away from the abutment, then gravel 22 is laid and filled in the gap, and the laying thickness is 15cm, and manual rolling and leveling are adopted.

(3) After the water absorption layer 2 is paved, a sand cushion layer 3 is paved on the basis, the used filler is composed of natural gravel, coarse sand and other granular materials 31, the filling thickness is 10cm, and the vibration compaction is carried out.

(4) Laying large-scale regeneration aggregate porous structure blocks 44 prefabricated in a factory in advance on the sand cushion layer 3, determining the length, width and height of the regeneration aggregate porous structure blocks 44 according to the actual roadbed condition before prefabrication, and filling foam lightweight soil 43 prepared in advance into the holes after laying.

(5) The geogrid 7 is laid between the bottom base layer 42 and the upper base layer 41, and after the geogrid 7 is laid and positioned, soil is filled in time for covering, and the exposure time is not more than 48 hours. And then, paving the upper base layer, wherein the construction method is the same as the construction method (4).

(6) After the base layer 4 is laid, a layer of geogrid 7 is laid before surface layer construction, and the laying method is the same as that in step (5).

(7) Then a layer of modified emulsified asphalt adhesive layer 6 with the thickness of 1cm is paved, and the dosage is 0.5kg/m². Before laying, the layers are cleaned, and then emulsified asphalt modified by SBR composite binder is uniformly distributed as the layer-sticking oil.

(8) When the surface layer is constructed, an upper layer, a middle layer and a lower layer need to be filled in a layered mode, a layer of coarse-grained asphalt concrete 53(AC-13C) with the thickness of 10cm is paved, and an anti-rutting modifier is doped in the coarse-grained asphalt concrete. Then a layer of medium grain asphalt concrete 52(AC-20C) doped with the anti-rutting modifier with the thickness of 6cm is paved, and finally a layer of fine grain SBS modified asphalt concrete 51(AC-13C) with the thickness of 4cm is paved.

Finally, it should be noted that the above embodiments are merely representative examples of the present invention. It is obvious that the utility model is not limited to the above-described embodiments, but that many variations are possible. Any simple modification and modification of the above embodiments in accordance with the technical spirit of the present invention should be considered as falling within the scope of the present invention.

Claims

1. The road-bridge transition section roadbed structure for preventing the bridge head from jumping is removed and fixed by using a road, and is characterized by sequentially comprising a ramming soil layer, a water absorbing layer, a sand cushion layer, a base layer and a surface layer from bottom to top; the water absorption layer comprises expansion bags and gravel filled in gaps among the expansion bags; the base layer comprises large prefabricated recycled aggregate porous structure blocks and foam lightweight soil filled in holes among the large prefabricated recycled aggregate porous structure blocks.

2. The roadbed structure for the transition section of the road bridge, which is used for removing solid wastes and preventing vehicle bump at the bridge head by using a road as claimed in claim 1, wherein a modified emulsified asphalt adhesive layer is laid between the base layer and the surface layer.

3. The roadbed structure for the transition section of the road bridge, which is used for preventing the vehicle bump at the bridge head and is solid waste in the demolition of the road according to claim 2, wherein the base layer comprises an upper base layer and a subbase layer, and geogrids are respectively arranged between the subbase layer and the upper base layer and between the upper base layer and the modified emulsified asphalt adhesive layer.

4. The roadbed structure for the transition section of the road bridge, which is used for removing solid wastes and preventing vehicle bump at the bridge head by using a road as claimed in claim 1, wherein the expansion bags in the water absorption layer are divided into an upper layer and a lower layer which are distributed in a staggered manner.

5. The roadbed structure for the transition section of the road bridge, which is used for removing solid wastes and preventing vehicle bump at the bridge head by using a road, according to claim 4, wherein the expansion bags are arranged from dense to sparse along the direction of the bridge head pointing to the road.

6. The roadbed structure for the transition section of the road bridge, which is used for removing solid waste and preventing vehicle bump at the bridge head by using a road, according to claim 1, wherein the sand cushion layer is composed of granular materials.

7. The bridge transition section roadbed structure for preventing bump at the bridge head, which utilizes the road to demolish solid wastes, according to claim 6, wherein the aggregate is natural gravel or coarse sand.

8. The roadbed structure for the transition section of the road bridge, which is used for removing solid waste and preventing vehicle bump at the bridge head by using a road, according to claim 1, wherein the surface layer comprises an upper layer, a middle layer and a lower layer, the upper layer is composed of fine-grain asphalt concrete, the middle layer is composed of medium-grain asphalt concrete, and the lower layer is composed of coarse-grain asphalt concrete.