Reconstruction and extension method for existing road slope

Abstract

The invention discloses a reconstruction and extension method of an existing road side slope, which is characterized in that construction is carried out from top to bottom and from inside to outside, and a new supporting structure can be directly established without adopting an independent template, a support and a construction machine to protect a soil body or a rock on each layer of excavation side in the construction process; temporary protection is arranged above an original supporting structure and serves as a protection facility for construction of a first layer of soil body. During downward layer-by-layer construction, part of the original supporting structure is dismantled during construction of each layer, 0.5 m of the original supporting structure is reserved to be exposed out of the excavation face of each layer and serves as a protection facility for construction of soil bodies on the second layer and below the second layer, and therefore normal operation of roads beside is not affected, the original supporting structure is reutilized, and temporary protection does not need to be additionally arranged; therefore, the reconstruction and extension method for the existing road side slope can effectively guarantee the stability of the road side slope after secondary excavation, and has the advantages of being simple and convenient in process, safe in construction, high in construction efficiency, capable of reducing investment of mechanical equipment and capable of saving cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of road slope reconstruction and expansion, and particularly relates to a method for reconstructing and expanding an existing road slope. Background Art

[0002] With the rapid development of China's economy, the transportation pressure on expressways has gradually increased. Some old roads can no longer meet the growing traffic demand at the present stage, and their widening and reconstruction have become one of the urgent problems to be solved. In the prior art, when excavating a road slope, generally, for each layer of excavation, a temporary protection needs to be set up on another layer of the road slope platform to prevent the normal operation of the original driving road from being disrupted due to the construction of each layer of soil body; and generally, when establishing a new support structure on one side after excavation, it is implemented by a construction method of layer-by-layer construction from bottom to top. This construction method has some potential disadvantages:

[0003] (1) Low construction efficiency: Each layer of construction requires separate formwork, supports, and construction machinery, which results in a reduction in construction efficiency.

[0004] (2) Construction risks: During the construction process, the upper soil body or rock may be unstable, posing risks of landslides or rockfalls, threatening construction personnel and equipment. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a method for reconstructing and expanding an existing road slope, which can effectively ensure the stability of the road slope after secondary excavation, and has the characteristics of simple process, construction safety, high construction efficiency, reduction of mechanical equipment input, and cost savings.

[0006] To solve the above technical problems, the present invention provides a method for reconstructing and expanding an existing road slope, which includes the following steps:

[0007] Step 1, set up temporary protection on the original support structure;

[0008] Step 2, vertically divide the road slope into three layers;

[0009] Step 3, excavate the soil body of the first layer, and reserve a part of the soil body on the side close to the original support structure; then establish a first new support structure on the side of the newly excavated road slope far from the original support structure; then excavate the remaining part of the first layer of soil body; finally, remove the temporary protection and part of the original support structure, and reserve 0.5 m of the original support structure to be exposed to the second layer of soil body as a protection facility for the construction of the second layer of soil body;

[0010] Step 4: Excavate the soil layer of the second layer, and reserve a part of the soil on the side close to the original support structure; then establish a second new support structure on the side of the newly excavated road slope far from the original support structure, so that the upper end of the second new support structure abuts against the lower end of the first new support structure; then excavate the remaining part of the soil layer of the second layer; finally, demolish a part of the original support structure, and reserve 0.5 m of the original support structure exposed on the third layer of soil as a protective facility for the construction of the third layer of soil.

[0011] Step 5: Excavate the soil layer of the third layer, and reserve a part of the soil on the side close to the original support structure; then establish a third new support structure on the side of the newly excavated road slope far from the original support structure, so that the upper end of the third new support structure abuts against the lower end of the second new support structure.

[0012] Step 6: Excavate the soil under the third new support structure; then establish a fourth new support structure on the side of the newly excavated road slope far from the original support structure, so that the upper end of the fourth new support structure abuts against the lower end of the third new support structure, and bury the fourth new support structure under the road surface; then excavate the remaining part of the third layer of soil; finally, demolish the remaining original support structure exposed on the road surface.

[0013] Step 7: Level the road surface.

[0014] As a preferred solution of the present invention, in the step 3, a soil slope with a slope of 1:1 is provided on the side of the part of the soil reserved on the side close to the original support structure in the first layer on the side of the newly excavated road slope.

[0015] As a preferred solution of the present invention, in the step 4, a soil slope with a slope of 1:1 is provided on the side of the part of the soil reserved on the side close to the original support structure in the second layer on the side of the newly excavated road slope.

[0016] As a preferred solution of the present invention, in the step 5, a soil slope with a slope of 1:1 is provided on the side of the part of the soil reserved on the side close to the original support structure in the third layer on the side of the newly excavated road slope.

[0017] As a preferred solution of the present invention, in the step 3, the first new support structure is anchored to the soil outside the road slope through a bolt.

[0018] As a preferred solution of the present invention, in the step 4, the second new support structure is anchored to the soil outside the road slope through a bolt.

[0019] As a preferred solution of the present invention, in the step 5, the third new support structure is anchored to the soil outside the road slope through a bolt.

[0020] As a preferred embodiment of the present invention, in step six, the lower end of the fourth new support structure is provided with a horizontally extending anti-pulling portion towards the road side, and the anti-pulling portion is buried under the road surface by concrete.

[0021] As a preferred embodiment of the present invention, the first new support structure, the second new support structure, the third new support structure, and the fourth new support structure are all provided with slopes on the surface on one side of the road.

[0022] Implementing the method for reconstruction and expansion of existing road slopes of the present invention has the following beneficial effects compared with the prior art:

[0023] The method for reconstruction and expansion of existing road slopes of the present invention vertically divides the road slope into three layers, and constructs in the order from top to bottom and from inside to outside. During the construction process, there is no need to use separate formwork, supports, and construction machinery to protect the soil or rock on the excavation side of each layer, and a new support structure can be directly established; a temporary protection is set above the original support structure as a protection facility for the construction of the first layer of soil; when constructing layer by layer downwards, a part of the original support structure is removed during the construction of each layer, and 0.5 m of the original support structure is retained and exposed on the excavation surface of each layer as a protection facility for the construction of the soil layer of the second layer and below, so as not to affect the normal operation of the adjacent road, reuse the original support structure, and there is no need to set up a temporary protection additionally; it can be seen that the method for reconstruction and expansion of existing road slopes of the present invention can effectively ensure the stability of the road slope after secondary excavation, and has the characteristics of simple process, construction safety, high construction efficiency, reduction of mechanical equipment investment, and cost saving. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0025] Figure 1 It is a schematic diagram of the method for reconstruction and expansion of existing road slopes provided by the embodiments of the present invention. Detailed Embodiments

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. in the present invention is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] As Figure 1 shown, a preferred embodiment of the present invention.

[0029] A method for reconstruction and expansion of an existing road slope, comprising the following steps:

[0030] Step 1, establish a temporary protection 2 on the original support structure 1; this temporary protection 2 is used to prevent the normal operation of the original driving road from being disrupted due to the construction of the first layer of soil.

[0031] Step 2, vertically divide the road slope into three layers.

[0032] Step 3, excavate the soil mass 3a of the first layer, and reserve a part of the soil mass 3b on the side close to the original support structure 1 to ensure the stability of the foundation pit on the side close to the driving road; then establish a first new support structure 4a on the side of the newly excavated road slope far from the original support structure 1; then excavate the remaining part of the soil mass 3b of the first layer; finally, remove the temporary protection 2 and part of the original support structure 1a, and reserve 0.5 m of the original support structure exposed to the second layer of soil as a protection facility for the construction of the second layer of soil.

[0033] Step 4, excavate the soil mass 3c of the second layer, and reserve a part of the soil mass 3d on the side close to the original support structure 1 to ensure the stability of the foundation pit on the side close to the driving road; then establish a second new support structure 4b on the side of the newly excavated road slope far from the original support structure 1, so that the upper end of the second new support structure 4b abuts against the lower end of the first new support structure 4a; then excavate the remaining part of the soil mass 3d of the second layer; finally, remove part of the original support structure 1b, and reserve 0.5 m of the original support structure exposed to the third layer of soil as a protection facility for the construction of the third layer of soil.

[0034] Step 5: Excavate the soil mass 3e of the third layer, and reserve a part of the soil mass 3f on the side close to the original support structure 1 to ensure the stability of the foundation pit on the side close to the driving road; then establish a third new support structure 4c on the side of the excavated new road slope far from the original support structure 1, so that the upper end of the third new support structure 4c abuts against the lower end of the second new support structure 4b;

[0035] Step 6: Excavate the part 3g below the third new support structure 4c; then establish a fourth new support structure 4d on the side of the excavated new road slope far from the original support structure 1, so that the upper end of the fourth new support structure 4d abuts against the lower end of the third new support structure 4c, and bury the fourth new support structure 4d below the road surface; then excavate the remaining part of the soil mass 3f of the third layer; finally, demolish the remaining original support structure 1c exposed on the road surface.

[0036] Step 7: Level the road surface.

[0037] Thus, according to the method for reconstructing and expanding an existing road slope in the embodiment of the present invention, the road slope is vertically stratified into three layers, and the construction is carried out in the order from top to bottom and from inside to outside. During the construction process, there is no need to use separate formwork, supports and construction machinery to protect the soil or rock on the excavated side of each layer, and a new support structure can be directly established; a temporary protection is set above the original support structure 1 as a protection facility for the construction of the first layer of soil mass; when constructing layer by layer downwards, part of the original support structure is demolished during the construction of each layer, and 0.5 m of the original support structure is reserved and exposed on the excavation surface of each layer as a protection facility for the construction of the soil mass of the second layer and below, so that the original support structure 1 is reused, and there is no need to set up a temporary protection additionally, so as not to affect the normal operation of the adjacent road; it can be seen that the method for reconstructing and expanding an existing road slope in the embodiment of the present invention can effectively ensure the stability of the road slope after secondary excavation, and has the characteristics of simple process, construction safety, high construction efficiency, reduction of mechanical equipment input and cost saving.

[0038] Exemplarily, in the step 3, a soil slope 7 with a slope of 1:1 is provided on the side of the part of the soil mass reserved on the side close to the original support structure 1 in the first layer on the side of the excavated new road slope. The soil slope 7 can improve the stability of the foundation pit on the side close to the driving road, prevent the reserved soil mass from landsliding or collapsing due to construction or natural factors, and at the same time can be used as a safety barrier during construction to protect construction personnel and equipment from potential landslides or falling rocks, and can also provide a convenient working surface for construction, facilitating the operation of construction machinery and personnel.

[0039] Exemplarily, in the fourth step, a soil slope 7 with a slope of 1:1 is provided on the side of the newly excavated road slope for the part of the soil body reserved on the side close to the original support structure 1 in the second layer. This soil slope 7 can improve the stability of the foundation pit on the side close to the driving road, prevent the reserved soil body from landsliding or collapsing due to construction or natural factors, and at the same time can serve as a safety barrier during construction to protect construction workers and equipment from potential landslides or falling rocks. It can also provide a convenient working surface for construction, facilitating the operation of construction machinery and personnel.

[0040] Exemplarily, in the fifth step, a soil slope 7 with a slope of 1:1 is provided on the side of the newly excavated road slope for the part of the soil body reserved on the side close to the original support structure 1 in the third layer. This soil slope 7 can improve the stability of the foundation pit on the side close to the driving road, prevent the reserved soil body from landsliding or collapsing due to construction or natural factors, and at the same time can serve as a safety barrier during construction to protect construction workers and equipment from potential landslides or falling rocks. It can also provide a convenient working surface for construction, facilitating the operation of construction machinery and personnel.

[0041] Exemplarily, in the third step, the first new support structure 4a is anchored to the soil body outside the road slope through the anchor rod 5a to solve the problem of instability caused by the lower part of the first new support structure 4a being suspended, and to ensure the safety of construction from top to bottom.

[0042] Exemplarily, in the fourth step, the second new support structure 4b is anchored to the soil body outside the road slope through the anchor rod 5b to solve the problem of instability caused by the lower part of the second new support structure 4b being suspended, and to ensure the safety of construction from top to bottom.

[0043] Exemplarily, in the fifth step, the third new support structure 4c is anchored to the soil body outside the road slope through the anchor rod 5c to solve the problem of instability caused by the lower part of the third new support structure 4c being suspended, and to ensure the safety of construction from top to bottom.

[0044] Exemplarily, in the sixth step, the lower end of the fourth new support structure 4d is provided with a horizontally extending anti-pulling part 4e towards the road side, and the anti-pulling part 4e is buried under the road surface through the concrete 6. The design of this anti-pulling part 4e can make the bottom of the support structure be connected more tightly to the foundation, resist the acting forces such as soil pressure and water pressure, prevent the support structure from becoming unstable, and meet the safety and stability requirements of the project.

[0045] Exemplarily, the first new support structure 4a, the second new support structure 4b, the third new support structure 4c, and the fourth new support structure 4d are all provided with slopes on the surface on one side of the road. Such a design can, on the one hand, help to quickly drain rainwater and other surface water, reduce the accumulation of water on the slope, and prevent water erosion and landslides; on the other hand, it can reduce the soil pressure on the slope, reduce the risk of slope instability, and improve the overall stability of the slope.

[0046] In the description of the present invention, it should be understood that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0047] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A method for reconstruction and expansion of existing road slopes, characterized in that, It includes the following steps: Step 1, set up temporary protection on the original support structure; Step 2, vertically divide the road slope into three layers; Step 3, excavate the soil in the first layer and reserve part of the soil on the side close to the original support structure; then establish the first new support structure on the side of the newly excavated road slope far from the original support structure; then excavate the remaining part of the soil in the first layer; finally, remove the temporary protection and part of the original support structure, and reserve 0.5 m of the original support structure exposed on the second layer of soil as the protection facility for the construction of the second layer of soil; Step 4, excavate the soil in the second layer and reserve part of the soil on the side close to the original support structure; then establish the second new support structure on the side of the newly excavated road slope far from the original support structure, and make the upper end of the second new support structure abut against the lower end of the first new support structure; then excavate the remaining part of the soil in the second layer; finally, remove part of the original support structure, and reserve 0.5 m of the original support structure exposed on the third layer of soil as the protection facility for the construction of the third layer of soil; Step 5, excavate the soil in the third layer and reserve part of the soil on the side close to the original support structure; then establish the third new support structure on the side of the newly excavated road slope far from the original support structure, and make the upper end of the third new support structure abut against the lower end of the second new support structure; Step 6, excavate the soil under the third new support structure; then establish the fourth new support structure on the side of the newly excavated road slope far from the original support structure, and make the upper end of the fourth new support structure abut against the lower end of the third new support structure, and bury the fourth new support structure under the road surface; then excavate the remaining part of the soil in the third layer; finally, remove the remaining original support structure exposed on the road surface; Step 7, level the road surface.

2. The method for reconstruction and expansion of existing road slopes according to claim 1, characterized in that, In the said Step 3, the part of the soil reserved on the side close to the original support structure in the first layer has a soil slope with a slope of 1:1 on the side of the newly excavated road slope.

3. The reconstruction and expansion method for existing road slopes as claimed in claim 1, wherein, In the said Step 4, the part of the soil reserved on the side close to the original support structure in the second layer has a soil slope with a slope of 1:1 on the side of the newly excavated road slope.

4. The method for reconstruction and extension of existing road slopes as claimed in claim 1, characterized in that, In the said Step 5, the part of the soil reserved on the side close to the original support structure in the third layer has a soil slope with a slope of 1:1 on the side of the newly excavated road slope.

5. The method for reconstruction and extension of existing road slopes according to claim 1, characterized in that, In the said Step 3, the first new support structure is anchored to the soil outside the road slope through anchor rods.

6. The reconstruction and expansion method for the existing road slope according to claim 1, characterized in that, In the said Step 4, the second new support structure is anchored to the soil outside the road slope through anchor rods.

7. The method for reconstruction and extension of existing road slopes as claimed in claim 1, characterized in that, In the said Step 5, the third new support structure is anchored to the soil outside the road slope through anchor rods.

8. The method for reconstruction and extension of existing road slopes according to claim 1, characterized in that, In the said Step 6, the lower end of the fourth new support structure is provided with a horizontally extending anti-pulling part towards the road side, and the anti-pulling part is buried under the road surface through concrete.

9. The method for reconstruction and expansion of existing road slopes according to claim 1, characterized in that, The first new support structure, the second new support structure, the third new support structure and the fourth new support structure all have slopes on the surface on one side of the road.

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