Impermeable carbon-absorbing lining structure and existing highway tunnel reconstruction and extension structure
By using a composite material of anti-seepage and carbon-absorbing secondary lining in tunnel reconstruction and expansion projects, the problems of low toughness and high carbon emissions of ordinary concrete lining structures have been solved, achieving low-carbon and environmentally friendly tunnel reconstruction and expansion effects, and improving the stability and safety of tunnels.
Patent Information
- Application Number
- CN202422953736.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-02
AI Technical Summary
In existing tunnel reconstruction and expansion projects, ordinary concrete lining structures have low toughness and high carbon emissions, which cannot meet environmental protection and mechanical requirements.
A carbon-absorbing and seepage-proof secondary lining is adopted, which is a composite material composed of magnesium oxide, calcium oxide, fly ash/silica fume, quartz fine sand, polycarboxylate superplasticizer, thickener and polyethylene fiber. It replaces the traditional seepage-proof board and is combined with ordinary concrete primary support and secondary lining to form a carbon-absorbing and seepage-proof lining structure. It absorbs carbon dioxide and reacts with it, which enhances toughness and reduces permeability.
While reducing the use of ordinary concrete, it improves the toughness and environmental performance of the lining structure, reduces project costs, enhances tunnel stability and safety, and absorbs vehicle exhaust.
Smart Images
Figure CN223497917U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of geotechnical engineering technology, and in particular to a seepage-proof carbon-absorbing lining structure and an existing highway tunnel reconstruction and expansion structure. Background Technology
[0002] With the rapid increase in traffic volume, some older highway tunnels, even those on expressways, are unable to meet the growing traffic demands due to their lower design standards, thus hindering rapid economic development. These tunnels require reconstruction and expansion to reach the appropriate service levels. Furthermore, compared to building a new tunnel, tunnel reconstruction and expansion are carried out on the basis of an existing tunnel, resulting in less excavation. It allows for reference to initial engineering geological and hydrogeological data, or even supplementary investigations at locations where serious defects have been found, saving significant exploration work.
[0003] In existing renovation and expansion projects, a large amount of ordinary concrete is used as lining material. In terms of mechanical properties, ordinary concrete has low toughness; in terms of environmental protection, concrete production is a high-carbon emission process. Therefore, there is an urgent need to design a lining structure that combines toughness and low carbon emissions for tunnel renovation and expansion projects. Utility Model Content
[0004] The purpose of this utility model is to provide a seepage-proof carbon-absorbing lining structure and an existing highway tunnel reconstruction and expansion structure to improve the toughness and environmental performance of the lining structure.
[0005] Therefore, this utility model provides a seepage-proof and carbon-absorbing lining structure and a reconstruction and expansion structure for existing highway tunnels, the technical solution of which is as follows:
[0006] According to a first aspect of the present invention, a seepage-proof and carbon-absorbing lining structure is provided, comprising an ordinary concrete primary support, a seepage-proof and carbon-absorbing secondary lining, and an ordinary concrete secondary lining; wherein the seepage-proof and carbon-absorbing secondary lining is provided between the ordinary concrete primary support and the ordinary concrete secondary lining.
[0007] As a preferred technical solution, the thickness ratio of the ordinary concrete primary support, the seepage-proof and carbon-absorbing secondary lining, and the ordinary concrete secondary lining is 1:1 to 1.2:0.2 to 0.5.
[0008] As a preferred technical solution, the thickness of the ordinary concrete primary support is greater than the thickness of the ordinary concrete secondary lining, and the thickness of the impermeable and carbon-absorbing secondary lining is greater than or equal to the thickness of the ordinary concrete primary support.
[0009] According to a second aspect of the present invention, an existing highway tunnel reconstruction and expansion structure is provided, including a road foundation and a newly added lining area, wherein the newly added lining area is formed by the seepage-proof and carbon-absorbing lining structure as described above.
[0010] As a preferred technical solution, the system also includes multiple anchor bolts, which are used to fix the newly added lining area.
[0011] As a preferred technical solution, the newly added lining area is located above the existing tunnel lining stripping area, which is the area formed after the existing tunnel lining of the existing highway tunnel is stripped.
[0012] As a preferred technical solution, the road foundation includes a roadbed and a pavement, with the pavement disposed on top of the roadbed.
[0013] As a preferred technical solution, the road surface is provided with multiple parallel driving lanes and emergency parking lanes.
[0014] As a preferred technical solution, the number of driving lanes is set to 3.
[0015] The beneficial effects of this utility model are:
[0016] This invention proposes a carbon dioxide-absorbing lining structure for tunnel reconstruction and expansion projects. Through the interaction between the seepage-proof and carbon dioxide-absorbing secondary lining, the ordinary concrete initial support, and the ordinary concrete secondary lining, the lining structure achieves the dual benefits of seepage prevention and absorption of vehicle exhaust gases. Compared with traditional tunnel lining structures, it can reduce the thickness of the ordinary concrete initial support and eliminates the need for additional seepage-proof boards / fabric, significantly reducing project costs. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0018] Figure 1 A schematic diagram of a tunnel lining structure according to the prior art is shown.
[0019] Figure 2 A schematic diagram of a seepage-proof and carbon-absorbing lining structure for tunnel reconstruction and expansion projects is shown according to an embodiment of the present invention.
[0020] Figure 3 A schematic diagram of an existing highway tunnel structure based on the prior art is shown.
[0021] Figure 4 A structural diagram of an existing highway tunnel reconstruction and expansion structure according to an embodiment of the present utility model is shown.
[0022] Figure 5A schematic diagram of an existing highway tunnel structure after the addition of anchor bolts is shown, based on the prior art.
[0023] Figure label:
[0024] 100. Tunnel lining; 101. First ordinary concrete initial support; 102. Impermeable board / fabric; 103. First ordinary concrete secondary lining; 200. Impermeable and carbon-absorbing lining structure; 201. Ordinary concrete initial support; 202. Impermeable and carbon-absorbing secondary lining; 203. Ordinary concrete secondary lining; 300. Road foundation; 301. Roadbed; 302. Road surface; 400. Driving lane; 401. First driving lane; 402. Second driving lane; 403. Third driving lane; 500. Emergency parking lane; 600. Newly added lining area; 700. Anchor bolt; 800. Existing tunnel lining stripping area. Detailed Implementation
[0025] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.
[0026] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.
[0027] Example 1:
[0028] Figure 1 A schematic diagram of a tunnel lining structure according to the prior art is shown. Figure 1 As shown, the existing tunnel lining 100 includes a first ordinary concrete primary support 101, a seepage barrier board / fabric 102, and a first ordinary concrete secondary lining 103 connected in sequence. The first ordinary concrete secondary lining 103 faces the tunnel interior, while the first ordinary concrete primary support 101 is in contact with the soil. The seepage barrier board / fabric 102 serves as a seepage barrier. To ensure the tunnel lining 100 has a certain degree of toughness, when the seepage barrier board / fabric 102 does not provide toughness, the first ordinary concrete primary support 101 and the first ordinary concrete secondary lining 103 play a major supporting role; therefore, the thickness of the first ordinary concrete primary support 101 and the first ordinary concrete secondary lining 103 accounts for a large proportion of the entire tunnel lining 100. Ordinary concrete has low toughness, and concrete production is a high-carbon emission process. Therefore, there is an urgent need for a lining structure that combines toughness and low-carbon characteristics.
[0029] Based on this, the present invention provides a seepage-proof and carbon-absorbing lining structure for tunnel reconstruction and expansion projects. Figure 2 This is a schematic diagram of the seepage-proof and carbon-absorbing lining structure used in the tunnel reconstruction and expansion project. Figure 2 As shown, the seepage-proof and carbon-absorbing lining structure 200 includes an ordinary concrete primary support 201, a seepage-proof and carbon-absorbing secondary lining 202, and an ordinary concrete secondary lining 203; wherein, the seepage-proof and carbon-absorbing secondary lining 201 is provided between the ordinary concrete primary support 201 and the ordinary concrete secondary lining 203.
[0030] Please combine Figure 1 As shown, the difference between the seepage-proof and carbon-absorbing lining structure 200 provided in this embodiment and the traditional tunnel lining 100 lies in the use of a seepage-proof and carbon-absorbing secondary lining layer 202 to replace the seepage-proof board / cloth 102. The seepage-proof and carbon-absorbing secondary lining layer 202 not only has seepage-proof function but also possesses a certain degree of toughness, providing support. Therefore, in the seepage-proof and carbon-absorbing lining structure 200, compared with the existing tunnel lining 100, the thickness of the ordinary concrete primary support 201 and the ordinary concrete secondary lining 203 can be reduced for the same thickness, meaning less ordinary concrete is used, and the overall toughness is stronger, thus achieving a lining structure that combines toughness and low carbon characteristics.
[0031] In this embodiment, the impermeable carbon dioxide lining layer 202 is a composite material composed of magnesium oxide, calcium oxide, fly ash / silica fume, fine quartz sand, polycarboxylate superplasticizer, thickener, water, and polyethylene fiber. This impermeable carbon dioxide lining layer is an alkaline substance that can absorb carbon dioxide (CO2) in the exhaust gas and react with it chemically. The magnesium oxide contains magnesium oxide ions (Mg... 2+ ) and carbonate ions in carbon dioxide (CO3) 2 -) combine to form magnesium carbonate (MgCO3). Magnesium carbonate is an alkaline salt, and its formation slightly increases the pH value of the environment, which is conducive to the further activation of substances such as fly ash / silica fume. This layer is both tough, which can further increase the stability of the surrounding rock and improve tunnel safety, and it can also reduce permeability and absorb the exhaust gas produced by vehicles traveling in the tunnel.
[0032] In one embodiment, the thickness of the ordinary concrete primary support 201 is greater than the thickness of the ordinary concrete secondary lining 203, and the thickness of the seepage-proof and carbon-absorbing secondary lining 202 is greater than or equal to the thickness of the ordinary concrete primary support 201. For example, the thickness ratio of the ordinary concrete primary support 201, the seepage-proof and carbon-absorbing secondary lining 202, and the ordinary concrete secondary lining 203 is 1:1 to 1.2:0.2 to 0.5. Through this thickness design, while maintaining the same thickness as the traditional tunnel lining 100, the overall toughness is stronger, reducing the use of ordinary concrete and achieving low-carbon and environmentally friendly results.
[0033] Example 2:
[0034] Figure 3 This is a schematic diagram of an existing highway tunnel structure in the prior art. (Example:) Figure 3 As shown, the existing highway tunnel structure includes a tunnel lining 100 and a road foundation 300. The tunnel lining 100 is set on the road foundation 300 and is arch-shaped. The specific structure of the tunnel lining 100 is as follows: Figure 1 As shown, the specifics have been described in Embodiment 1 and will not be repeated here. A roadway 400 is provided on the road foundation 300, comprising a first roadway 401, a second roadway 402, and an emergency parking lane 500 located on one side of the roadway 402.
[0035] With increasing traffic volume, the expansion of existing highway tunnel structures has become increasingly necessary. For example, if the expansion requirement is to increase the number of lanes, it necessitates the removal of the existing tunnel lining 100 and the construction of a larger tunnel lining structure. Under this expansion requirement, after the removal of tunnel lining 100, a seepage-proof and carbon-absorbing lining structure 200, as provided in Example 1 for tunnel reconstruction and expansion projects, can be constructed to replace the original tunnel lining 100, thereby further improving the stability and environmental friendliness of the highway tunnel.
[0036] Based on this, the present invention provides a structure for the reconstruction and expansion of existing highway tunnels. Figure 4 This is a structural diagram of an existing highway tunnel reconstruction and expansion structure. (Example) Figure 4 As shown, the existing highway tunnel reconstruction and expansion structure includes a road foundation 300 and a newly added lining area 600, wherein the newly added lining area 600 is formed by the anti-seepage and carbon-absorbing lining structure 200 described in Example 1.
[0037] In some embodiments, such as Figure 4 As shown, the existing highway tunnel reconstruction and expansion structure also includes multiple anchor bolts 700, which are used to fix the newly added lining area 600.
[0038] In this embodiment, the multiple anchor bolts 700 are added to stabilize the excavation of the tunnel for reconstruction and expansion.
[0039] In some embodiments, such as Figure 4 As shown, the newly added lining area 600 is located above the existing tunnel lining stripping area 800, which is the area formed after the existing tunnel lining of the existing highway tunnel is stripped.
[0040] In some embodiments, such as Figure 4 As shown, the road foundation 300 includes a roadbed 301 and a road surface 302, with the road surface 302 disposed above the roadbed 301.
[0041] In this embodiment, the conventional tunnel road foundation structure of the road surface 302 and the roadbed 301 is not described in detail here.
[0042] In some embodiments, such as Figure 4 As shown, multiple parallel driving lanes 400 and emergency parking lanes 500 are provided on road surface 302.
[0043] Please combine Figure 3 and Figure 4 In the reconstruction and expansion structure of an existing highway tunnel, multiple parallel driving lanes 400 include a first driving lane 401, a second driving lane 402 and a third driving lane 403. The third driving lane 403 is a newly added driving lane. The emergency parking lane 500 is set on one side of the third driving lane 403 after the addition of the third driving lane 403.
[0044] This utility model embodiment provides a specific basis Figure 3 The existing highway tunnel structure shown is being transformed into, for example... Figure 4 The process flow for the reconstruction and expansion of an existing highway tunnel is shown below, and the process flow includes the following steps:
[0045] Step 1 involves reinforcing the tunnel rock or soil with anchor bolts, which firmly connects the underground rock or soil to the tunnel walls, enhancing the tunnel's geological stability. These anchor bolts prevent rock collapse, reducing the risk of tunnel collapse or damage; they also reduce the transmission of vibrations and noise generated during tunnel excavation, protecting the surrounding environment and nearby buildings.
[0046] The tunnel status after completing step 1 is as follows Figure 5 As shown.
[0047] Step 2 involves using blasting or hydraulic fracturing to peel off the existing tunnel lining, creating a stripped area that facilitates the use of new tunnel lining later.
[0048] Step 3: When constructing the new lining, reduce the initial thickness of the ordinary concrete support and replace the original impermeable board / cloth with a seepage-proof and carbon-absorbing secondary lining. This seepage-proof and carbon-absorbing secondary lining is mainly a composite material composed of magnesium oxide, calcium oxide, fly ash / silica fume, fine quartz sand, polycarboxylate superplasticizer, thickener, water, and polyethylene fiber. This seepage-proof and carbon-absorbing secondary lining is an alkaline substance that can absorb carbon dioxide (CO2) in the exhaust gas and react with it chemically. The magnesium oxide contains magnesium oxide ions (Mg... 2+ ) and carbonate ions in carbon dioxide (CO3) 2-) combine to form magnesium carbonate (MgCO3). Magnesium carbonate is an alkaline salt, and its formation slightly increases the pH value of the environment, which is conducive to the further activation of substances such as fly ash / silica fume. This layer is both tough, which can further increase the stability of the surrounding rock and improve tunnel safety, and it can also reduce permeability and absorb the exhaust gas produced by vehicles traveling in the tunnel.
[0049] After completing step 3, the entire process of upgrading and expanding an existing highway tunnel is complete, and the resulting upgraded and expanded structure of the existing highway tunnel is as follows: Figure 4 As shown.
[0050] The above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions also fall within the scope of the present utility model. The patent protection scope of the present utility model should be defined by the claims.
Claims
1. A carbon-absorbing lining structure, characterized in that, It includes an ordinary concrete primary support, a seepage-proof and carbon-absorbing secondary lining, and an ordinary concrete secondary lining; wherein, the seepage-proof and carbon-absorbing secondary lining is provided between the ordinary concrete primary support and the ordinary concrete secondary lining.
2. The anti-seepage and carbon-absorbing lining structure as described in claim 1, characterized in that, The thickness ratio of the ordinary concrete initial support, the seepage-proof and carbon-absorbing secondary lining, and the ordinary concrete secondary lining is 1:1 to 1.2:0.2 to 0.
5.
3. The anti-seepage and carbon-absorbing lining structure as described in claim 1, characterized in that, The thickness of the ordinary concrete primary support is greater than the thickness of the ordinary concrete secondary lining, and the thickness of the impermeable and carbon-absorbing secondary lining is greater than or equal to the thickness of the ordinary concrete primary support.
4. A structure for the reconstruction and expansion of an existing highway tunnel, characterized in that, It includes the road foundation and the newly added lining area, which is formed by the anti-seepage and carbon-absorbing lining structure according to any one of claims 1 to 2.
5. The existing highway tunnel reconstruction and expansion structure as described in claim 4, characterized in that, It also includes multiple anchor bolts for securing the newly added lining area.
6. The existing highway tunnel reconstruction and expansion structure as described in claim 4, characterized in that, The newly added lining area is located above the existing tunnel lining stripping area, which is the area formed after the existing tunnel lining of the existing highway tunnel is stripped.
7. The existing highway tunnel reconstruction and expansion structure as described in claim 4, characterized in that, The road foundation includes a roadbed and a pavement, with the pavement situated on top of the roadbed.
8. The existing highway tunnel reconstruction and expansion structure as described in claim 7, characterized in that, The road surface is equipped with multiple parallel driving lanes and emergency parking lanes.
9. The existing highway tunnel reconstruction and expansion structure as described in claim 8, characterized in that, The number of driving lanes is set to 3.