Existing roadbed high fill deep soft soil widening structure

Abstract

The utility model discloses an existing roadbed high fill deep soft soil widening structure which comprises mixing piles inserted into a soft soil foundation at intervals and a foam concrete wall supported on the soft soil foundation, the shape of the inner side of the foam concrete wall is matched with that of a step of an existing roadbed, and the foam concrete wall and the step of the existing roadbed are connected through steel pipe piles. A broken stone hardcore is laid between the soft soil foundation and the foam concrete wall, and the steel pipe piles are sequentially inserted into the foam concrete wall and steps of the existing roadbed. The utility model has the advantages of simple structure and reasonable design, effectively meets the requirement of narrow widening width, reduces the influence on the surrounding environment and the existing facilities, and relieves the pressure on the deep soft soil foundation, thereby reducing the differential settlement of new and old roadbeds and improving the overall stability of widening engineering.

Description

Technical Field

[0001] This utility model relates to the field of urban transportation technology, specifically to a widening structure for existing roadbeds with high fill and deep soft soil. Background Technology

[0002] In the process of infrastructure construction, it is often necessary to widen existing high embankment sections to meet the growing traffic demand. However, when encountering deep soft soil foundations, traditional widening methods have many problems.

[0003] The shortcomings of existing technology:

[0004] Currently, conventional filling methods are prone to uneven settlement between new and old roadbeds due to the low bearing capacity of soft soil, which can lead to road surface cracking, misalignment and other defects. Furthermore, traditional retaining structures such as gravity retaining walls not only occupy a large area, but are also difficult to construct on soft soil foundations, have poor stability, and are difficult to adapt to the needs of narrow road widening. Utility Model Content

[0005] The purpose of this utility model is to provide a structure for widening existing roadbeds with high fill and deep soft soil, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a widening structure for existing roadbed with high fill and deep soft soil, characterized by comprising: mixing piles vertically and intermittently inserted into the soft soil foundation; and a foamed concrete wall supported on the soft soil foundation, wherein the foamed concrete wall has a protrusion supported on the existing roadbed, and the protrusion is fixed to the existing roadbed.

[0007] Furthermore, the existing roadbed excavation has steps, and the protrusions of the foamed concrete wall have a shape adapted to the steps, so that the protrusions of the foamed concrete wall are supported by the steps.

[0008] Furthermore, it also has steel pipe piles that are inserted sequentially into the foamed concrete wall and the existing roadbed, and the steps are fixed to the foamed concrete wall by the steel pipe piles.

[0009] Furthermore, a gravel cushion layer is laid between the soft soil foundation and the foamed concrete wall.

[0010] Furthermore, the surface of the existing roadbed is flush with the surface of the foamed concrete wall.

[0011] Furthermore, the mixing pile penetrates the soft soil foundation and inserts into the underlying layer.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This type of existing roadbed high fill deep soft soil widening structure, by setting up foamed concrete walls, effectively meets the requirements of narrow widening width, reduces the impact on the surrounding environment and existing facilities, reduces the pressure on the deep soft soil foundation, thereby reducing uneven settlement between the old and new roadbeds and improving the overall stability of the widening project.

[0014] 2. This type of existing roadbed with high fill and deep soft soil widening structure, and the on-site casting construction process of foamed concrete wall is simple, without the need for large machinery and equipment and complex formwork support system, which can greatly shorten the construction period, reduce construction costs, and has low energy consumption and low pollution, meeting the requirements of green building and sustainable development. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] In the diagram: 110, mixing pile; 120, step; 130, foamed concrete wall; 140, steel pipe pile; 150, crushed stone cushion layer. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example

[0019] Please see Figure 1 As shown, this utility model provides a technical solution for widening a high-fill, deep soft soil section of an existing roadbed: it includes mixing piles 110 spaced apart and inserted into the soft soil foundation, and a foamed concrete wall 130 supported on the soft soil foundation. The inner side of the foamed concrete wall 130 has a protrusion supporting the existing roadbed, which is fixed to the existing roadbed. It can be seen that the inner and outer sides of the foamed concrete wall are supported by the existing roadbed and the soft soil foundation, respectively. Figure 1 The existing roadbed excavation shown has steps 120. The protrusions of the foamed concrete wall 130 have a shape adapted to the steps 120, so that the protrusions of the foamed concrete wall 130 are supported by the steps 120. The upper surface of the existing roadbed is flush with the upper surface of the foamed concrete wall 130.

[0020] like Figure 1In the illustrated embodiment, this widening structure also includes steel pipe piles 140 sequentially inserted into the foamed concrete wall 130 and the existing roadbed step 120, with the step 120 and the foamed concrete wall 130 fixed together by the steel pipe piles 140. To ensure stable support for the foamed concrete wall 130, the mixing piles 110 penetrate the soft soil layer and enter the underlying layer (hard soil or rock layer) to a depth of not less than 1.0m. The spacing between the mixing piles 110 is set to 1.2m, the length of the mixing piles 110 is set to 12m, and the diameter of the mixing piles 110 is set to 500mm. Through composite foundation reinforcement, the bearing capacity and overall stability of the foundation can be improved. The step 120 and the foamed concrete wall 130 are provided above the mixing piles 110. The density of the foamed concrete wall 130 is 300-600 kg / m³. 3 With a strength grade greater than or equal to C30, it effectively meets the requirements for widening narrow sections, reduces pressure on deep soft soil foundations, minimizes uneven settlement between new and old roadbeds, and improves the overall stability of the widening project. The foamed concrete wall 130 is constructed using a layered pouring method, with each layer having a pouring height of 300-500mm. During the pouring process, a dedicated foamed concrete foaming equipment and delivery pump are used to evenly pour the foamed concrete into the formwork. This eliminates the need for large-scale machinery and complex formwork support systems, significantly shortening the construction period and reducing construction costs. Steel pipe piles 140 with a diameter of 700mm are installed sequentially between the foamed concrete wall 130 and the step 120 to enhance the connection between the foamed concrete wall 130 and the existing roadbed.

[0021] In this embodiment, the foamed concrete wall 130 is provided with vent holes and drainage holes. The spacing between drainage holes is set to 1.0-1.5m, and the spacing between drainage holes is set to 0.5-1.0m. The vent holes and drainage holes are used to remove gas and excess water generated during the pouring process, ensuring the density and quality of the foamed concrete wall 130. A steel mesh is installed at intervals inside the foamed concrete wall 130, with a spacing of 150-200mm and a diameter of 6-10mm. The steel mesh effectively improves the crack resistance and integrity of the foamed concrete wall 130, enhancing its stability under complex stress conditions. The foamed concrete wall 130 is provided with concave-convex joints or tongue-and-groove joints, and waterstop strips or rubber waterstops are pre-embedded in these joints. The width of the waterstop strips or rubber waterstops is set to 20-30mm, and the thickness is set to 10-15mm. These waterstops prevent groundwater from seeping into the foamed concrete wall 130 along the construction joints, thus affecting its durability and stability.

[0022] In this embodiment, a crushed stone cushion layer 150 is provided on the top of the mixing pile 110. The crushed stone cushion layer 150 is filled with crushed stone and gravel materials. The thickness of the crushed stone cushion layer 150 is set to 300-500mm. The crushed stone cushion layer 150 can adjust the stress distribution between each mixing pile 110, so that the load can be evenly transferred to the mixing pile 110 and the soft soil, thereby improving stability.

[0023] The working principle of this utility model is as follows:

[0024] In this embodiment, a method for widening a deep soft soil section of an existing roadbed with high fill is implemented. First, the deep soft soil foundation is pre-treated. Steps 120 are excavated at the edge of the existing roadbed according to specified dimensions. Mixing piles 110 are used to reinforce the soft soil foundation, penetrating the soft soil layer and inserting into the underlying layer (hard soil or rock layer). A crushed stone cushion layer 150 is placed on top of the mixing piles 110. A foamed concrete wall 130 is then constructed above the mixing piles 110. The density of the foamed concrete wall 130 is 300–600 kg / m³. 3 With a strength grade greater than or equal to C30, it effectively meets the requirements for widening narrow sections, reduces pressure on deep soft soil foundations, minimizes uneven settlement between new and old roadbeds, and improves the overall stability of the widening project. The foamed concrete wall 130 is constructed using a layered pouring method, with each layer having a pouring height of 300-500mm. During the pouring process, a dedicated foamed concrete foaming equipment and delivery pump are used to evenly pour the foamed concrete into the formwork, eliminating the need for large machinery and complex formwork support systems. This significantly shortens the construction period and reduces construction costs. Steel pipe piles 140 with a diameter of 700mm are installed between the foamed concrete wall 130 and the step 120 to enhance the connection between the foamed concrete wall 130 and the existing roadbed.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A widening structure for existing roadbeds with high fill and deep soft soil, characterized in that... include: - Mixing piles (110) are vertically and intermittently inserted into the soft soil foundation; - A foamed concrete wall (130) is supported on the soft soil foundation and has a protrusion supported on the existing roadbed, the protrusion being fixed to the existing roadbed.

2. The existing roadbed high fill deep soft soil widening structure according to claim 1, characterized in that: The existing roadbed is provided with steps (120), and the protrusion of the foamed concrete wall (130) has a shape adapted to the steps (120), so that the protrusion of the foamed concrete wall (130) is supported by the steps (120).

3. The existing roadbed high fill deep soft soil widening structure according to claim 1, characterized in that: It also has steel pipe piles (140) that are inserted sequentially into the foamed concrete wall (130) and the steps (120) of the existing roadbed, and the steps (120) and the foamed concrete wall (130) are fixed together by the steel pipe piles (140).

4. The existing roadbed high fill deep soft soil widening structure according to claim 3, characterized in that: A crushed stone cushion layer (150) is laid between the soft soil foundation and the foamed concrete wall (130).

5. The existing roadbed high fill deep soft soil widening structure according to claim 1, characterized in that: The upper surface of the existing roadbed is flush with the upper surface of the foamed concrete wall (130).

6. The structure for widening existing roadbed high fill and deep soft soil as described in claim 1, characterized in that: The mixing pile (110) penetrates the soft soil foundation and inserts into the underlying layer.

7. The existing roadbed high fill deep soft soil widening structure according to claim 1, characterized in that: The foamed concrete wall (130) is provided with several drainage holes and seepage holes.

8. The existing roadbed high fill deep soft soil widening structure according to claim 1, characterized in that: The foamed concrete wall (130) is internally reinforced with steel mesh at intervals.

9. A widening structure for existing roadbeds with high fill and deep soft soil as described in claim 1, characterized in that: The construction joint of the foamed concrete wall (130) is provided with a tongue and groove joint, and a waterstop strip is provided at the tongue and groove joint.

10. A widening structure for existing roadbeds with high fill and deep soft soil as described in claim 4, characterized in that: The spacing between the mixing piles (110) is set to 1.0~1.5m, the length of the mixing piles (110) is set to 10~15m, and the diameter of the mixing piles (110) is set to 400~600mm; the thickness of the crushed stone cushion layer (150) is set to 300~500mm; and the diameter of the steel pipe piles (140) is set to 600~800mm.

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