Soft soil roadbed structure for preventing differential settlement
By setting up reinforced structures and stress layers in the soft soil subgrade structure, the problems of loosening and surface settlement of traditional soft soil reinforced subgrades are solved, and a more stable subgrade structure and a safer construction environment are achieved.
Patent Information
- Application Number
- CN202421862091.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-08-02
AI Technical Summary
Traditional soft soil reinforced roadbeds are prone to loosening after long-term use, and surface settlement may occur during soft soil construction, affecting road traffic smoothness and structural stability.
A soft soil roadbed structure is adopted to prevent uneven settlement, including the installation of a reinforcement structure and a stress layer on the soft soil layer. The reinforced structure is compacted and filled with gravel and gravel mixture through the strong tamp replacement reinforcement method. The stress layer increases the bearing capacity of the substrate through stressed steel cages and high-strength concrete to reduce settlement and deformation.
It effectively solves the problem of soft soil roadbed loosening after long-term use, and reduces surface settlement and deformation during construction, improves the stability and bearing capacity of the roadbed, and ensures the smoothness of road traffic and the safety of structure.
Smart Images
Figure CN222861986U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a soft soil roadbed structure, in particular to a soft soil roadbed structure for preventing uneven settlement, and belongs to the technical field of road construction. Background Art
[0002] Soft soil foundation refers to a common foundation in special areas. Soft soil has the characteristics of high water content, poor permeability, low natural strength and high compressibility. It is prone to settlement and deformation, posing a serious threat to the stability of buildings and infrastructure, and bringing risks and troubles to driving. Therefore, during the construction of soft soil foundation, it is necessary to design a soft soil roadbed structure to prevent uneven settlement.
[0003] Since the structure of soft soil roadbed is relatively loose, it often faces problems such as insufficient bearing capacity of the base, excessive settlement or uneven settlement, excessive lateral deformation, overall or local instability, etc., so it needs to be reinforced. After long-term use, traditional soft soil reinforced roadbed is prone to loosening due to geological movement and soil material, and is prone to overall deformation, which in turn affects the strength of the base and has the problem of easy loosening. At the same time, when constructing highway bridges on soft soil foundations, operations such as filling, excavation and foundation pit support often cause large surface settlement, which may affect the smoothness of road traffic. Uncontrolled foundation pit settlement may cause settlement or tilt of adjacent buildings or bridge structures, and even cause structural damage, posing serious dangers to the construction area and surrounding environment. Utility Model Content
[0004] 1. Technical issues to be solved
[0005] The utility model provides a soft soil roadbed structure for preventing uneven settlement, so as to solve the problem that the traditional soft soil reinforced roadbed in the prior art is easy to loosen after long-term use, and at the same time solves the problem that the soft soil foundation may cause surface settlement during the construction process.
[0006] (II) Technical solution
[0007] The utility model is implemented through the following technical scheme: a soft soil roadbed structure for preventing uneven settlement, comprising a soft soil layer, a foundation pit is excavated on the upper surface of the soft soil layer, a reinforcement structure for enhancing overall stability is opened at the bottom of the foundation pit, a crushed stone layer is arranged above the reinforcement structure, a stress layer for slowing down the settlement effect is laid above the crushed stone layer, a first cement layer is laid above the stress layer, a sandy soil layer is laid above the first cement layer, and a surface layer is laid above the sandy soil layer.
[0008] Preferably, the reinforced structure includes reinforcement holes compacted by dynamic compaction replacement reinforcement method, and the reinforcement holes are filled with a mixture of gravel and sand, which is beneficial to the stability of the reinforced structure. Dynamic compaction replacement reinforcement can pressurize and compact the original soft soil layer while filling it with a mixture of gravel and sand to achieve soil strength reinforcement.
[0009] Preferably, the stress layer includes a stress steel cage, which is arranged above the gravel layer. The stress layer also includes high-strength concrete. After the stress steel cage is tied, it is filled with high-strength concrete. The stress layer increases the bearing capacity of the matrix and provides the main stress-bearing layer for the whole, reducing the foundation settlement or excessive uneven settlement, excessive lateral deformation, overall or local instability and other problems.
[0010] Preferably, a supporting device is provided on the upper surface of the soft soil layer. The supporting device is completed before the foundation pit is excavated. The supporting device includes a plurality of vertical concrete piles and transverse concrete connecting plates, which are beneficial to the stability of the foundation pit. The supporting device can prevent the collapse of the foundation pit due to the loosening of the soft soil layer when the foundation pit is excavated.
[0011] Preferably, the side walls of the foundation pit are provided with lateral concrete retaining walls, and a second cement layer is filled between the lateral concrete retaining walls and the stress steel cage. The construction time of the lateral concrete retaining walls is after the excavation of the foundation pit and before the construction of the reinforcement structure. The lateral concrete retaining walls are used to protect the side walls of the foundation pit from soil erosion and collapse during operations in the foundation pit.
[0012] Preferably, the thickness of the stress layer is greater than that of the crushed stone layer and the first cement layer, and the stress steel cage should be fully vibrated after pouring concrete, which is beneficial to the stability of the stress layer and thus maintains the overall stability.
[0013] Preferably, when pouring the first cement layer, it should be ensured that the stress layer has been demoulded and cured, and when filling the sand layer, it should be ensured that the first cement layer has been cured to avoid the filling of the sand layer affecting the cement-soil blending ratio of the first cement layer, thereby maintaining the stability of the first cement layer.
[0014] The utility model provides a soft soil roadbed structure for preventing uneven settlement, which has the following beneficial effects:
[0015] 1. The soft soil roadbed structure for preventing uneven settlement is provided with a reinforcement structure and a stress layer, so that in the daily use of the soft soil roadbed structure, the stress layer can provide the main stress-bearing layer for the whole structure, reduce the foundation settlement or excessive uneven settlement, excessive lateral deformation, overall or local instability and other problems, and at the same time, the reinforcement structure is reinforced by pressurizing and compacting the original soft soil layer while filling it with a mixture of gravel and sand and gravel to achieve soil strength reinforcement, thereby solving the problem of easy loosening of the traditional soft soil reinforced roadbed in the prior art after long-term use.
[0016] 2. The soft soil roadbed structure for preventing uneven settlement is provided with a support device and a lateral concrete retaining wall. The support device can maintain the stability of the foundation pit and avoid the collapse of the foundation pit due to the loosening of the soft soil layer during the excavation of the foundation pit. When working in the foundation pit, the lateral concrete retaining wall can prevent the side wall of the foundation pit from soil erosion and subsequent collapse. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a front view of the soft soil layer of the utility model;
[0018] Figure 2 It is a front view of the gravel layer of the utility model;
[0019] Figure 3 It is a cross-sectional view of the side view of the vertical concrete pile of the utility model;
[0020] Figure 4 It is a detailed structural drawing of the stress reinforcement cage of the utility model;
[0021] Figure 5 The effect of stress layer thickness on replacement depth.
[0022] Description of Reference Numerals
[0023] 1. Soft soil layer; 2. Foundation pit; 3. Strengthening structure; 4. Gravel layer; 5. Stress layer; 6. First cement layer; 7. Sand layer; 8. Surface layer;
[0024] 301, reinforcement hole; 302, gravel and grit mixture;
[0025] 501, stress reinforcement cage;
[0026] 9. Support device; 901. Vertical concrete pile; 902. Horizontal concrete connecting plate;
[0027] 10. Lateral concrete retaining wall; 11. Second cement layer. DETAILED DESCRIPTION
[0028] The embodiment of the utility model provides a soft soil roadbed structure for preventing uneven settlement.
[0029] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4, including a soft soil layer 1, a foundation pit 2 is excavated on the upper surface of the soft soil layer 1, a reinforcement structure 3 for enhancing the overall stability is opened at the bottom of the foundation pit 2, a crushed stone layer 4 is arranged above the reinforcement structure 3, a stress layer 5 for slowing down the settlement is laid above the crushed stone layer 4, a first cement layer 6 is laid above the stress layer 5, a sand layer 7 is laid above the first cement layer 6, and a surface layer 8 is laid above the sand layer 7.
[0030] Please refer to Figure 2 , Figure 3 and Figure 4 The reinforced structure 3 includes a reinforced hole 301 rammed by a strong tamping replacement reinforcement method, and the reinforced hole 301 is filled with a gravel and gravel mixture 302, which is beneficial to the stability of the reinforced structure 3. The strong tamping replacement reinforcement can pressurize and compact the original soft soil layer 1 while filling the gravel and gravel mixture 302 to achieve soil strength reinforcement. The stress layer 5 includes a stress steel cage 501, which is arranged above the gravel layer 4. The stress layer 5 also includes high-strength concrete. After the stress steel cage 501 is tied, it is filled with high-strength concrete. The stress layer 5 increases the bearing capacity of the matrix, provides the main stress-bearing layer for the whole, and reduces the foundation settlement or excessive uneven settlement, excessive lateral deformation, overall or local instability and other problems.
[0031] Please refer to Figure 1 , Figure 2 and Figure 4 A supporting device 9 is provided on the upper surface of the soft soil layer 1. The supporting device 9 is completed before the excavation of the foundation pit 2. The supporting device 9 includes a plurality of vertical concrete piles 901 and a transverse concrete connecting plate 902, which is beneficial to the stability of the foundation pit 2. The supporting device 9 can prevent the foundation pit 2 from collapsing due to the loosening of the soft soil layer 1 when the foundation pit 2 is excavated. A lateral concrete retaining wall 10 is provided on the side wall of the foundation pit 2. A second cement layer 11 is filled between the lateral concrete retaining wall 10 and the stress steel cage 501. The construction time of the lateral concrete retaining wall 10 is after the excavation of the foundation pit 2 and before the construction of the reinforcement structure 3. Through the protection of the lateral concrete retaining wall 10, the side wall of the foundation pit 2 is prevented from water and soil erosion and collapse when working in the foundation pit 2.
[0032] Please refer to Figure 2 , Figure 3 and Figure 4 The thickness of the stress layer 5 is greater than that of the crushed stone layer 4 and the first cement layer 6. The stress steel cage 501 should be fully vibrated after pouring the concrete, which is beneficial to the stability of the stress layer 5, thereby maintaining the overall stability. When pouring the first cement layer 6, it should be ensured that the stress layer 5 has completed demolding and curing. When filling the sand layer 7, it should be ensured that the first cement layer 6 has completed curing to avoid the landfill of the sand layer 7 affecting the cement-soil blending ratio of the first cement layer 6, thereby maintaining the stability of the first cement layer 6.
[0033] When the utility model is in use:
[0034] Please refer to Figure 1 Before excavating the foundation pit 2, a deep hole is first opened along the excavation direction of the foundation pit 2, and a support device 9 is set. The construction of the support device 9 is to cast a vertical concrete pile 901 in the deep hole, and cast a horizontal concrete connecting plate 902 on the top of the vertical concrete pile 901, which is beneficial to the stability of the foundation pit 2. The support device 9 can prevent the foundation pit 2 from collapsing due to the loosening of the soft soil layer 1 when excavating the foundation pit 2.
[0035] Please refer to Figure 1 After the construction of the support device 9 is completed, the foundation pit 2 is excavated. After the excavation of the foundation pit 2 is completed, a lateral concrete retaining wall 10 is set on the side wall of the foundation pit 2. By setting the support device 9 and the lateral concrete retaining wall 10, the support device 9 can maintain the stability of the foundation pit 2 and avoid the collapse of the foundation pit 2 due to the loosening of the soft soil layer 1 when excavating the foundation pit 2. When working in the foundation pit 2, the lateral concrete retaining wall 10 can prevent the side wall of the foundation pit 2 from collapsing due to soil erosion.
[0036] Afterwards, a reinforcement structure 3 is constructed on the bottom surface of the foundation pit 2, and a reinforcement hole 301 is rammed out with a tamping device. The reinforcement hole 301 is filled with a gravel and sand gravel mixture 302, and then a crushed stone layer 4 is filled on top of the reinforcement structure 3, and a stress layer 5 is poured on top of the crushed stone layer 4.
[0037] Figure 5 The effect of stress layer thickness on displacement depth is shown. The thickening of the stress layer may lead to an increase in the overall stiffness of the cushion. When the cushion stiffness increases, part of the tamping energy may rebound or propagate inside the cushion instead of being transferred to the soil, thereby reducing the displacement effect on the soil. Secondly, as the thickness of the stress layer increases, the same unit of tamping energy will be more dispersed in a thicker cushion. Part of the energy may be more easily absorbed inside the cushion, reducing the energy transferred to the soil. Next, a thicker stress layer may undergo local compaction under force, thereby reducing the displacement capacity of the soil. A relatively thin cushion may transfer energy to the soil more evenly. Finally, a thicker cushion may have a stronger restraining effect on the soil, limiting the displacement deformation of the soil. A relatively thin cushion may make it easier to achieve soil displacement and mixing.
[0038] By setting up the reinforcing structure 3 and the stress layer 5, during the daily use of the soft soil roadbed structure, the stress layer 5 can provide the main stress-bearing layer for the whole structure, thereby reducing the occurrence of problems such as excessive foundation settlement or uneven settlement, excessive lateral deformation, and overall or local instability. At the same time, the reinforcing structure 3 reinforces the soil strength by pressurizing and compacting the original soft soil layer 1 while filling it with a gravel and sand gravel mixture 302, thereby solving the problem of easy loosening of the traditional soft soil reinforced roadbed in the prior art after long-term use.
[0039] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A soft soil roadbed structure for preventing uneven settlement, comprising a soft soil layer (1), characterized in that: A foundation pit (2) is excavated on the upper surface of the soft soil layer (1); a reinforcement structure (3) for enhancing overall stability is provided at the bottom of the foundation pit (2); a crushed stone layer (4) is provided above the reinforcement structure (3); a stress layer (5) for slowing down the settlement effect is laid above the crushed stone layer (4); a first cement layer (6) is laid above the stress layer (5); a sand layer (7) is laid above the first cement layer (6); and a surface layer (8) is laid above the sand layer (7).
2. A soft soil roadbed structure for preventing uneven settlement according to claim 1, characterized in that: The reinforcement structure (3) comprises a reinforcement hole (301) compacted by a strong compaction displacement reinforcement method, and the reinforcement hole (301) is filled with a mixture of gravel and sand (302).
3. The soft soil roadbed structure for preventing uneven settlement according to claim 1, characterized in that: The stress layer (5) comprises a stress steel cage (501), which is arranged above the gravel layer (4). The stress layer (5) also comprises high-strength concrete, which is filled with high-strength concrete after the stress steel cage (501) is tied.
4. The soft soil roadbed structure for preventing uneven settlement according to claim 1, characterized in that: A support device (9) is provided on the upper surface of the soft soil layer (1), and the support device (9) is completed before the foundation pit (2) is excavated. The support device (9) comprises a plurality of vertical concrete piles (901) and a transverse concrete connecting plate (902).
5. The soft soil roadbed structure for preventing uneven settlement according to claim 1, characterized in that: The side walls of the foundation pit (2) are provided with lateral concrete retaining walls (10), and a second cement layer (11) is filled between the lateral concrete retaining walls (10) and the stress steel cage (501). The construction time of the lateral concrete retaining walls (10) is after the foundation pit (2) is excavated and before the reinforcement structure (3) is constructed.
6. The soft soil roadbed structure for preventing uneven settlement according to claim 3, characterized in that: The thickness of the stress layer (5) is greater than that of the crushed stone layer (4) and the first cement layer (6), and the stress steel cage (501) should be fully vibrated after pouring concrete.
7. The soft soil roadbed structure for preventing uneven settlement according to claim 1, characterized in that: When pouring the first cement layer (6), it should be ensured that the stress layer (5) has been demoulded and cured, and when filling the sand layer (7), it should be ensured that the first cement layer (6) has been cured.