Noise reduction cement-based steel slag coating structure for highway tunnel

Abstract

The utility model provides a noise reduction cement-based steel slag coating structure for a highway tunnel, which comprises a tunnel lining layer and a cement-based steel slag coating layer, the cement-based steel slag coating layer is arranged on the inner side of the tunnel lining layer, and steel slag of the cement-based steel slag coating layer protrudes out of the surface. In this way, the steel slag of the cement-based steel slag coating layer protrudes out of the surface to form a concave-convex structure, the air viscous resistance and the friction effect of sound waves in the cement-based steel slag coating transmission process are effectively improved, sound energy is converted into heat energy, and therefore the good sound absorption and noise reduction effect is achieved; meanwhile, steel slag is easy to obtain and low in construction cost; compared with common porous sound absorption materials such as organic fibers and organic foam, the cement-based steel slag coating has excellent fire resistance, durability, corrosion resistance and moisture resistance, is particularly suitable for tunnel engineering, does not generate any toxic and harmful gas when a fire disaster occurs in a tunnel, and can meet the requirement for tunnel operation safety.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel engineering, in particular to a noise-reducing cement-based steel slag coating structure for highway tunnels. Background Art

[0002] The tunnel is a nearly closed environment. The noise from its own equipment (such as jet fans) and traffic flow is reflected and superimposed on the inner wall of the tunnel many times, thus forming long-lasting strong noise. Severe noise pollution will not only cause health hazards such as hearing loss, mental irritability, and increased blood pressure to drivers, passengers, and tunnel maintenance personnel, but will also lead to an increase in traffic accident rates.

[0003] At present, the commonly used tunnel noise reduction measures include using low-noise porous asphalt pavement or laying sound-absorbing materials on the inner wall of the tunnel. The former has limited noise reduction effect and can only reduce 3-5dB noise, which cannot completely solve the noise reduction needs in the tunnel. Although laying sound-absorbing materials on the inner wall of the tunnel can reduce noise, it has poor durability and will produce toxic and harmful gases in the event of a fire, so it is not suitable for tunnels. Although the remaining sound-absorbing panels have good fire resistance, their laying process is relatively complicated, the bonding effect with the tunnel lining is poor and the cost is relatively high.

[0004] In view of this, it is necessary to propose a noise reduction cement-based steel slag coating structure for highway tunnels to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of the utility model is to provide a noise reduction cement-based steel slag coating structure for a highway tunnel, so as to solve the problems of poor noise reduction effect and poor durability of the tunnel noise reduction structure in the prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides a noise reduction cement-based steel slag coating structure for a highway tunnel, comprising a tunnel lining layer and a cement-based steel slag coating layer, wherein the cement-based steel slag coating layer is arranged on the inner side of the tunnel lining layer, and the steel slag of the cement-based steel slag coating layer protrudes from the surface.

[0007] Preferably, the steel slag of the cement-based steel slag coating layer has sound-absorbing holes distributed at intervals.

[0008] Preferably, the protruding area of ​​the steel slag of the cement-based steel slag coating layer is larger than the embedded area of ​​the steel slag of the cement-based steel slag coating layer.

[0009] Preferably, the steel slag particle size of the cement-based steel slag coating layer is at least one of 4.75-9.5 mm, 9.5-13.2 mm, and 13.2-16.0 mm.

[0010] Preferably, the thickness of the cement-based steel slag coating layer is 1.5 times the maximum nominal particle size of the steel slag in the cement-based steel slag coating layer.

[0011] Preferably, the thickness of the cement-based steel slag coating layer is 15 to 25 mm.

[0012] Preferably, the tunnel lining layer is a single-layer lining or a secondary lining in a composite lining.

[0013] Preferably, the surface of the cement-based steel slag coating layer is coated with a retarder.

[0014] Preferably, the spraying amount of the retarder is 150-300 g / m 2 .

[0015] Preferably, the steel slag porosity of the cement-based steel slag coating layer is not less than 10%.

[0016] Compared with the prior art, the utility model provides the following beneficial effects:

[0017] The utility model provides a noise reduction cement-based steel slag coating structure for highway tunnels, comprising a tunnel lining layer and a cement-based steel slag coating layer, wherein the cement-based steel slag coating layer is arranged on the inner side of the tunnel lining layer, and the steel slag of the cement-based steel slag coating layer is protruded from the surface. In this way, by protruding the steel slag of the cement-based steel slag coating layer from the surface to form a concave-convex structure, the air viscosity resistance and friction effect of the sound wave in the cement-based steel slag coating transmission process are effectively increased, and the sound energy is converted into heat energy, thereby achieving a good sound absorption and noise reduction effect; at the same time, as a by-product of steelmaking, steel slag is easy to obtain and has a low engineering cost, and its resource utilization can effectively reduce mining, save a large amount of natural resources, and have significant social and environmental benefits; and compared with commonly used porous sound-absorbing materials such as organic fibers and organic foams, cement-based steel slag coating has excellent fire resistance, durability, corrosion resistance and moisture resistance, and is particularly suitable for tunnel engineering, and when a fire occurs in the tunnel, no toxic and harmful gas will be generated, which can meet the safety requirements of tunnel operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of an application scenario of the overall structure in one embodiment of the utility model;

[0020] Figure 2 It is a structural schematic diagram of an embodiment of the utility model.

[0021] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0022] Description of Figure Numbers:

[0023] 10. Cement-based steel slag coating layer; 110. Steel slag; 120. Sound-absorbing holes; 20. Tunnel lining layer. DETAILED DESCRIPTION

[0024] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0028] Please refer to the attached Figure 1-2, which is different from the tunnel noise reduction measures in the prior art, including the use of low-noise porous asphalt pavement or laying sound-absorbing materials on the inner wall of the tunnel. The former has limited noise reduction effect and can only reduce 3-5dB noise, and cannot completely solve the noise reduction needs in the tunnel; although laying sound-absorbing materials on the inner wall of the tunnel can reduce noise, its durability is poor, and it will produce toxic and harmful gases in the event of a fire, so it is not suitable for tunnels. Although the remaining sound-absorbing panels have good fire resistance, the laying process is relatively complicated, the bonding effect with the tunnel lining is poor, and the cost is relatively high. The present application solves the above-mentioned defects in the prior art by providing a noise-reducing cement-based steel slag coating structure for highway tunnels. The details are as follows:

[0029] The tunnel lining layer comprises a tunnel lining layer 20 and a cement-based steel slag coating layer 10. The cement-based steel slag coating layer 10 is arranged on the inner side of the tunnel lining layer 20. The steel slag 110 of the cement-based steel slag coating layer 10 is protruded from the surface.

[0030] Specifically, the tunnel lining layer 20 is a structural layer for maintaining the stability and durability of the tunnel, and is used to support and maintain the stability of the tunnel, maintain the space required for passage, prevent weathering of the surrounding rock, and eliminate the influence of groundwater; and the cement-based steel slag coating layer 10 is used for noise reduction and sound absorption, and is arranged on the inner side of the tunnel lining layer 20, where the inner side refers to the side away from the rock layer (i.e., close to the tunnel passage space for sound absorption and noise reduction). It uses steel slag 110 as coarse aggregate, combined with cement, sand, water, and polycarboxylic acid type water reducer, which are mixed evenly in proportion. The steel slag 110 can be steel slag 110 coarse aggregate, cement, sand and other bulk building materials and smelting waste slag. The raw materials are easy to obtain and the project cost is low. At the same time, as a by-product of steelmaking, the resource utilization of steel slag 110 can effectively reduce mining, save a lot of natural resources, and have significant social and environmental benefits.

[0031] Among them, the steel slag 110 in the cement-based steel slag coating layer 10 is protruded from the surface (that is, part of it is embedded in the cement-based steel slag coating layer 10, and the other part is exposed outside the cement-based steel slag coating layer 10), thereby forming a concave-convex structure of cement mortar-steel slag 110. When the sound wave is transmitted, it encounters the concave-convex part of the coating, which increases the air viscosity resistance and friction, thereby consuming sound energy to achieve a good sound absorption and noise reduction effect.

[0032] As a preferred embodiment of the present invention, the steel slag 110 of the cement-based steel slag coating layer 10 has sound-absorbing holes 120 distributed at intervals.

[0033] It should be noted that the sound absorption holes 120 are the microporous texture on the steel slag 110 of the cement-based steel slag coating layer 10. A plurality of sound absorption holes 120 are formed on the steel slag 110 through microporous treatment. The principle is similar to that of the concave-convex structure. After part of the sound waves are transmitted to the plurality of sound absorption holes 120, the air viscosity resistance and friction effect of the sound waves in the transmission process are further increased, thereby further consuming the sound energy and further optimizing the sound absorption and noise reduction effect. The sound absorption holes 120 can be distributed radially and sporadically.

[0034] As a preferred embodiment of the present invention, the protruding area of ​​the steel slag 110 of the cement-based steel slag coating layer 10 is larger than the embedded area of ​​the steel slag 110 of the cement-based steel slag coating layer 10 .

[0035] It should be noted that the protruding area of ​​the steel slag 110 of the cement-based steel slag coating layer 10 is relatively large to ensure a better sound absorption and noise reduction effect, which needs to be larger than the embedded area of ​​the steel slag 110 of the cement-based steel slag coating layer 10, that is, preferably, the protruding area of ​​the steel slag 110 of the cement-based steel slag coating layer 10 accounts for no less than 50%.

[0036] As a preferred embodiment of the present invention, the particle size of the steel slag 110 of the cement-based steel slag coating layer 10 is at least one of 4.75-9.5 mm, 9.5-13.2 mm, and 13.2-16.0 mm.

[0037] It is worth noting that the coarse aggregate material of the steel slag 110 of the cement-based steel slag coating layer 10 can be one of the above three or all three, and those skilled in the art can choose according to actual conditions.

[0038] As a preferred embodiment of the present invention, the thickness of the cement-based steel slag coating layer 10 is 1.5 times the maximum nominal particle size of the steel slag 110 of the cement-based steel slag coating layer 10 .

[0039] It is worth noting that the thickness of the cement-based steel slag coating layer 10 can be determined according to the maximum nominal particle size of the steel slag 110 to ensure the quality, durability and safety of the coating layer.

[0040] Furthermore, the cement-based steel slag coating layer 10 has a thickness of 15 to 25 mm.

[0041] It should be noted that when the cement-based steel slag coating layer 10 uses the steel slag 110 with a particle size of 13.2 to 16.0 mm, the thickness of the cement-based steel slag coating layer 10 can be set to 22 to 25 mm, preferably 25 mm.

[0042] Furthermore, the tunnel lining layer 20 is a single-layer lining or a secondary lining in a composite lining.

[0043] It should be understood that, for a single-layer lined tunnel, the tunnel lining layer 20 is a single-layer lining layer, and the cement-based steel slag coating layer 10 is arranged on the inner side of the single-layer lining; while for a composite lining, it is composed of two or more layers of supporting structures, so there is a secondary lining in addition to the primary lining. In this case, the tunnel lining layer 20 is a secondary lining layer, and the cement-based steel slag coating layer 10 is arranged on the inner side of the secondary lining.

[0044] Furthermore, the surface of the cement-based steel slag coating layer 10 is coated with a retarder.

[0045] It should be noted that after the mixed coating mixture is evenly applied to the inner side of the tunnel lining layer 20, before the cement mortar initially sets, the solidification of the cement mortar should be slowed down to facilitate brushing off a certain thickness of cement mortar on the surface. The retarder is sprayed every 4 to 8 hours. After curing for 18 to 24 hours, when the deep cement mortar hardens and solidifies and bonds with the tunnel lining, 1.5 to 3 mm of cement mortar on the surface is brushed off. The brushing can be carried out by using a brush or a wire brush supplemented by pressurized water washing to ensure that the coarse aggregate of the steel slag 110 is exposed to form a concave-convex structure. Therefore, a retarder needs to be coated on the surface of the cement-based steel slag coating layer 10, and the spraying amount of the retarder is 150 to 300 g / m 2 The main ingredients of the retarder are sodium gluconate, water and propylene glycol.

[0046] Furthermore, the porosity of the steel slag 110 of the cement-based steel slag coating layer 10 is not less than 10%.

[0047] It is worth noting that the porosity of the sound-absorbing holes in the steel slag 110 is controlled to ensure good noise reduction and sound absorption effects while ensuring the strength of the structural layer. Therefore, the porosity of the steel slag 110 of the cement-based steel slag coating layer 10 can be set to be not less than 10%. Preferably, the porosity of the steel slag 110 of the cement-based steel slag coating layer 10 can be 12%.

[0048] The utility model provides a specific preferred embodiment as follows:

[0049] A cement-based steel slag coating layer 10 and a tunnel lining layer 20 are used, wherein the cement-based steel slag coating layer 10 comprises 20 parts of 4.75-9.5 mm steel slag 110 coarse aggregate, 18 parts of 9.5-13.2 mm steel slag 110 coarse aggregate, 18 parts of 13.2-16 mm steel slag 110 coarse aggregate, and ordinary Portland cement (PO 42.5) 15 parts, sand 21 parts, water 8 parts, polycarboxylic acid type water reducer 0.1 parts, steel slag 110 coarse aggregate after 12 months of aging stabilization treatment, cement-based steel slag 110 coating construction process is to mix steel slag 110 coarse aggregate, cement, sand, water and polycarboxylic acid type water reducer evenly according to the designed mix ratio; the mixed mixture is evenly applied on the tunnel lining, the surface thickness is 25mm, before the cement mortar is initially set, the retarder is sprayed on the cement-based steel slag 110 coating surface in the form of mist, and the spraying amount is 200g / m 2 , and cover with plastic film for curing; thereafter, spray retarder every 6 hours, cure for 24 hours. After the deep cement mortar hardens and solidifies and bonds with the tunnel lining, use a brush with pressurized water to brush off 1.5-3mm cement mortar on the surface, so that the steel slag 110 coarse aggregate is exposed.

[0050] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A noise reduction cement-based steel slag coating structure for highway tunnels, characterized in that: The invention comprises a tunnel lining layer and a cement-based steel slag coating layer, wherein the cement-based steel slag coating layer is arranged on the inner side of the tunnel lining layer. The steel slag of the cement-based steel slag coating layer is arranged to protrude from the surface.

2. The noise reduction cement-based steel slag coating structure for highway tunnels according to claim 1 is characterized in that: The steel slag of the cement-based steel slag coating layer is provided with sound-absorbing holes distributed at intervals.

3. The noise reduction cement-based steel slag coating structure for highway tunnels according to claim 1 is characterized in that: The protruding area of ​​the steel slag of the cement-based steel slag coating layer is greater than the embedded area of ​​the steel slag of the cement-based steel slag coating layer.

4. The noise reduction cement-based steel slag coating structure for highway tunnels according to claim 1, characterized in that: The steel slag particle size of the cement-based steel slag coating layer is at least one of 4.75-9.5 mm, 9.5-13.2 mm, and 13.2-16.0 mm.

5. The noise reduction cement-based steel slag coating structure for highway tunnels according to claim 4 is characterized in that: The thickness of the cement-based steel slag coating layer is 1.5 times the maximum nominal particle size of the steel slag in the cement-based steel slag coating layer.

6. The noise reduction cement-based steel slag coating structure for highway tunnels according to claim 5, characterized in that: The thickness of the cement-based steel slag coating layer is 15 to 25 mm.

7. The noise reduction cement-based steel slag coating structure for highway tunnels according to claim 1, characterized in that: The tunnel lining layer is a single-layer lining or a secondary lining in a composite lining.

8. The noise reduction cement-based steel slag coating structure for highway tunnels according to claim 1, characterized in that: The surface of the cement-based steel slag coating layer is coated with a retarder.

9. The noise reduction cement-based steel slag coating structure for highway tunnels according to claim 8, characterized in that: The spraying amount of the retarder is 150-300 g / m 2 .

10. The noise reduction cement-based steel slag coating structure for highway tunnels according to claim 2, characterized in that: The steel slag porosity of the cement-based steel slag coating layer is not less than 10%.

Images