Construction method of underground cavern anti-seepage system

Abstract

The invention discloses an underground cavern anti-seepage system construction method which comprises the following steps: primary lining treatment: implementing first-stage shotcreting and anchoring concrete treatment on a current underground cavern to obtain a primary lining layer; carrying out flattening treatment and surface cleaning treatment on the current primary lining layer to obtain a treated primary lining layer; spraying construction is conducted, specifically, on the basis of the surface of the primary lining layer of the current underground cavern, rapid-hardening rubber asphalt waterproof and anti-seepage paint is sprayed twice to form a waterproof coating; secondary lining pouring is conducted, specifically, accurate thickness control is conducted on the current waterproof coating, and after the current waterproof coating meets acceptance inspection parameter conditions, secondary concrete spraying treatment is conducted on the current waterproof coating to obtain a secondary concrete layer; and then the second-stage concrete layer is subjected to molding supporting treatment. According to the underground cavern anti-seepage system construction method provided by the embodiment of the invention, the attachment effect of the condensed light aggregate concrete and the side wall of the foundation pit is good through on-site observation, the phenomenon of concrete falling or surface cracking does not occur, and the whole system is in a stable state.

Description

Technical Field

[0001] The invention relates to the field of construction and treatment of underground cavern anti-seepage systems, and in particular to a construction method of underground cavern anti-seepage systems. Background Art

[0002] There is a big difference between underground cavern anti-seepage construction and ground anti-seepage and waterproofing construction; underground cavern anti-seepage construction has always been a technical problem.

[0003] The underground cavern is a closed underground environment, and environmental factors such as temperature, humidity, and pressure need to be considered, while ground anti-seepage and waterproofing are generally carried out in an open-air environment. Different base surface treatment requirements: The base surface treatment of underground caverns is more stringent, and the base surface needs to be thoroughly cleaned to ensure that the base surface is solid and flat. The base surface treatment of ground anti-seepage and waterproofing is also very important, but it is relatively simpler. Different choices of anti-seepage materials: Underground caverns generally use anti-seepage materials such as grouting, coatings, and waterproofing membranes, and characteristics such as pressure resistance and durability need to be considered. Ground anti-seepage and waterproofing mostly use waterproof coatings, asphalt-based waterproofing materials, etc. Different construction processes: Underground cavern anti-seepage requires basic processes such as base surface treatment and joint treatment before anti-seepage construction. The process of ground anti-seepage and waterproofing is relatively simpler.

[0004] Research has found that in the prior art, the spraying of anti-seepage coatings is completely controlled based on experience. Without reasonable control and management of the thickness of the waterproof coating, the anti-seepage quality of the overall system will be affected. Summary of the invention

[0005] The purpose of the present invention is to provide a construction method for an underground cavern anti-seepage system, which solves the above-mentioned technical problems pointed out in the prior art.

[0006] The present invention provides a construction method for an underground cavern anti-seepage system, comprising the following steps:

[0007] Primary lining treatment: Perform the first phase of shotcrete treatment on the current underground cavern to obtain the primary lining; perform leveling and surface cleaning on the current primary lining to obtain the treated primary lining;

[0008] Spraying construction: spraying quick-setting rubber asphalt waterproof and anti-seepage coating twice on the surface of the primary lining of the current underground cavern to form a waterproof coating; wherein the thickness of each spraying of quick-setting rubber asphalt waterproof and anti-seepage coating is 1 mm;

[0009] Second lining pouring: the thickness of the current waterproof coating is precisely controlled, and after it meets the acceptance parameter conditions, the current waterproof coating is subjected to second-phase concrete spraying treatment to obtain a second-phase concrete layer;

[0010] Then, the second-phase concrete layer is subjected to formwork support treatment.

[0011] Preferably, as an implementable solution, the first phase of shotcrete treatment is carried out on the current underground cavern to obtain the primary lining layer, and the specific operations are as follows:

[0012] When the first phase of shotcrete treatment is carried out on the current underground cavern, admixtures are added to the concrete for shotcrete treatment;

[0013] At the same time, the thickness of the primary lining is controlled, and the ratio of the thickness of the primary lining to the thickness of the second phase concrete layer is between 1:2.2-1:2.

[0014] Preferably, as an implementable scheme, before the second lining is cast, it also includes preset acceptance parameter conditions; the acceptance parameter conditions include setting the thickness of the waterproof coating according to the waterproof grade requirements of the current underground cavern.

[0015] Preferably, as an implementable method, the thickness of the waterproof coating is set according to the waterproof grade requirement of the current underground cavern, specifically comprising: first obtaining a preset empirical data mapping table to obtain the geological condition information of the current underground cavern; according to the empirical data mapping table, querying the empirical data mapping table according to the waterproof grade and geological condition information of the current underground cavern to output the corresponding setting thickness of the waterproof coating;

[0016] The empirical data mapping table includes waterproof grade, geological condition information and corresponding thickness of waterproof coating.

[0017] There is no fixed standard value for the ratio of the thickness of the primary lining to the thickness of the secondary concrete layer. It can be adjusted according to specific engineering requirements, geological conditions and design parameters. However, in general, the thickness of the primary lining should be appropriately compared with the thickness of the secondary concrete layer to ensure the stability and anti-seepage performance of the structure. It should be noted that: consider the impact of geological conditions on the structure. If the geological conditions are good and the risk of water infiltration faced by the underground cavern is low, the thickness of the primary lining may be appropriately reduced. On the contrary, if the geological conditions are poor and there is a higher risk of water infiltration, the thickness of the primary lining may need to be increased to provide better anti-seepage effect.

[0018] Consider the structural requirements and design parameters of the cavern. If the cavern is subject to heavy loads or high crushing forces, the thickness of the primary lining may need to be increased to provide adequate strength and stability.

[0019] Preferably, as an implementable embodiment; while performing the second-phase concrete spraying treatment on the current waterproof coating to obtain the second-phase concrete layer, it also includes spraying a coagulant at intervals of a preset time period.

[0020] Preferably, as an implementable embodiment, the coagulant is a concrete coagulant.

[0021] It should be noted that by selecting and adding appropriate admixtures, it is ensured to have good anti-seepage performance and solidification characteristics. This admixture can improve and guarantee the anti-seepage performance of concrete.

[0022] Ensure the quality and effect of shotcrete construction. Reasonably adjust the shotcrete spraying speed, spraying pressure and nozzle distance to obtain a uniform and tight concrete cover. The construction of shotcrete anchor concrete should follow relevant technical specifications and standards.

[0023] Lining thickness and coverage: According to the specific design requirements and geological conditions, adjust the thickness and coverage of the primary lining. Ensure that the concrete cover can completely cover the surface of the underground cavern and provide sufficient anti-seepage performance.

[0024] Compared with the prior art, the embodiments of the present invention have at least the following technical advantages:

[0025] From the analysis of the above-mentioned construction method of the underground cavern anti-seepage system provided by the present invention, it can be known that in specific application; first, a first-phase sprayed anchor concrete treatment is performed on the current underground cavern to obtain a primary lining; the current primary lining is leveled and surface cleaned to obtain a treated primary lining; two coats of spraying quick-setting rubber asphalt waterproof and anti-seepage coating are performed on the surface of the primary lining of the current underground cavern to form a waterproof coating; the thickness of the current waterproof coating is accurately controlled, and after it meets the acceptance parameter conditions, the current waterproof coating is subjected to a second-phase concrete spraying treatment to obtain a second-phase concrete layer; then the second-phase concrete layer is subjected to a formwork support treatment; before the second lining is cast, it also includes preset acceptance parameter conditions; the acceptance parameter conditions include setting the thickness of the waterproof coating according to the waterproof grade requirements of the current underground cavern.

[0026] The thickness of the waterproof coating is set according to the waterproof grade requirement of the current underground cavern, specifically comprising: first obtaining a preset empirical data mapping table to obtain geological condition information of the current underground cavern; according to the empirical data mapping table, calling and querying the empirical data mapping table output according to the waterproof grade and geological condition information of the current underground cavern to set the thickness of the waterproof coating;

[0027] The empirical data mapping table includes waterproof grade, geological condition information and corresponding thickness of waterproof coating.

[0028] There is no fixed standard value for the ratio of the thickness of the primary lining to the thickness of the secondary concrete layer. It can be adjusted according to specific engineering requirements, geological conditions and design parameters. However, in general, the thickness of the primary lining should be appropriately compared with the thickness of the secondary concrete layer to ensure the stability and anti-seepage performance of the structure. It should be noted that: consider the impact of geological conditions on the structure. If the geological conditions are good and the risk of water infiltration faced by the underground cavern is low, the thickness of the primary lining may be appropriately reduced. On the contrary, if the geological conditions are poor and there is a higher risk of water infiltration, the thickness of the primary lining may need to be increased to provide better anti-seepage effect.

[0029] Consider the structural requirements and design parameters of the cavern. If the cavern is subject to heavy loads or high crushing forces, the thickness of the primary lining may need to be increased to provide adequate strength and stability.

[0030] Embodiment 1 of the present invention provides a construction method for an underground cavern anti-seepage system, which adopts multiple anti-seepage guarantees: the initial lining layer is treated with sprayed anchor concrete to form an initial waterproof barrier; the surface is cleaned and a quick-setting rubber waterproof coating is sprayed to form a waterproof coating; the second phase concrete lining layer provides structural support and further anti-seepage.

[0031] It also realizes intelligent and precise thickness control: according to the acceptance parameter conditions set in advance, the thickness of the waterproof coating is accurately controlled according to the geological conditions and waterproof grade requirements; the thickness ratio of the primary lining layer and the second phase concrete layer is reasonably determined to ensure structural stability and anti-seepage performance; it can take geological conditions and waterproof grade as input, and then output the thickness of the waterproof coating;

[0032] Systematic anti-seepage: Improve the overall anti-seepage performance through comprehensive anti-seepage measures such as structural anti-seepage, leakage blocking, and drainage system; In summary, this set of hierarchical and highly controllable anti-seepage technical solutions can effectively meet the anti-seepage and waterproofing requirements of underground caverns and has good engineering applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 An overall flow chart of a construction method for an underground cavern anti-seepage system provided in Embodiment 1 of the present invention;

[0034] Figure 2 A schematic diagram of a specific operation flow in a construction method of an underground cavern anti-seepage system provided in Embodiment 1 of the present invention;

[0035] Figure 3 It is a structural principle diagram of the underground cavern anti-seepage system in an embodiment of the present invention;

[0036] Figure 4 for Figure 3 Schematic diagram of the actual structural analysis of the underground cavern anti-seepage system in an embodiment of the present invention.

[0037] Labels: Phase I shotcrete layer 10; waterproof coating 20; Phase II concrete layer 30. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0040] See also Figure 1 , Embodiment 1 of the present invention provides a construction method for an underground cavern anti-seepage system, including the following operation steps: primary lining treatment → spraying construction → secondary lining pouring and other processes;

[0041] S10, primary lining treatment: perform a first-phase shotcrete treatment on the current underground cavern to obtain a primary lining; perform leveling treatment and surface cleaning treatment on the current primary lining to obtain a treated primary lining;

[0042] S20, spraying construction: spraying a quick-setting rubber asphalt waterproof and anti-seepage coating twice on the surface of the primary lining of the current underground cavern to form a waterproof coating; wherein the thickness of each spraying of the quick-setting rubber asphalt waterproof and anti-seepage coating is 1 mm;

[0043] S30, second lining pouring: accurately controlling the thickness of the current waterproof coating, and after it meets the acceptance parameter conditions, performing second-phase concrete spraying treatment on the current waterproof coating to obtain a second-phase concrete layer;

[0044] S40, then performing formwork support treatment on the second phase concrete layer.

[0045] Embodiment 1 of the present invention provides a construction method for an underground cavern anti-seepage system, which adopts layered construction to ensure quality: firstly, a primary lining layer is constructed, then a waterproof coating is applied, and then a second-phase concrete lining layer is poured; Figure 3 and Figure 4 , Figure 3 It is a structural principle diagram of the underground cavern anti-seepage system in an embodiment of the present invention, including a first-phase sprayed anchor concrete layer 10, a quick-setting rubber asphalt waterproof and anti-seepage coating forming a waterproof coating 20, and a second-phase concrete layer 30;

[0046] join Figure 2 The first phase of shotcrete treatment is carried out on the current underground cavern to obtain the primary lining. The specific operations are as follows:

[0047] S11. When the first phase of shotcrete treatment is carried out on the current underground cavern, admixtures are added to the concrete for shotcrete treatment;

[0048] S12. Simultaneously controlling the thickness of the primary lining layer, wherein the ratio of the thickness of the primary lining layer to the thickness of the second-phase concrete layer is between 1:2.2 and 1:2.

[0049] Preferably, as an implementable scheme, before the second lining is cast, it also includes preset acceptance parameter conditions; the acceptance parameter conditions include setting the thickness of the waterproof coating according to the waterproof grade requirements of the current underground cavern.

[0050] Preferably, as an implementable method, the thickness of the waterproof coating is set according to the waterproof grade requirement of the current underground cavern, specifically comprising: first obtaining a preset empirical data mapping table to obtain the geological condition information of the current underground cavern; according to the empirical data mapping table, querying the empirical data mapping table according to the waterproof grade and geological condition information of the current underground cavern to output the corresponding setting thickness of the waterproof coating;

[0051] The empirical data mapping table includes waterproof grade, geological condition information and corresponding thickness of waterproof coating.

[0052] There is no fixed standard value for the ratio of the thickness of the primary lining to the thickness of the secondary concrete layer. It can be adjusted according to specific engineering requirements, geological conditions and design parameters. However, in general, the thickness of the primary lining should be appropriately compared with the thickness of the secondary concrete layer to ensure the stability and anti-seepage performance of the structure. It should be noted that: consider the impact of geological conditions on the structure. If the geological conditions are good and the risk of water infiltration faced by the underground cavern is low, the thickness of the primary lining may be appropriately reduced. On the contrary, if the geological conditions are poor and there is a higher risk of water infiltration, the thickness of the primary lining may need to be increased to provide better anti-seepage effect.

[0053] Consider the structural requirements and design parameters of the cavern. If the cavern is subject to heavy loads or high crushing forces, the thickness of the primary lining may need to be increased to provide adequate strength and stability.

[0054] Preferably, as an implementable embodiment; while performing the second-phase concrete spraying treatment on the current waterproof coating to obtain the second-phase concrete layer, it also includes spraying a coagulant at intervals of a preset time period.

[0055] Preferably, as an implementable embodiment, the coagulant is a concrete coagulant.

[0056] It should be noted that by selecting and adding appropriate admixtures, it is ensured to have good anti-seepage performance and solidification characteristics. This admixture can improve and guarantee the anti-seepage performance of concrete.

[0057] Ensure the quality and effect of shotcrete construction. Reasonably adjust the shotcrete spraying speed, spraying pressure and nozzle distance to obtain a uniform and tight concrete cover. The construction of shotcrete anchor concrete should follow relevant technical specifications and standards.

[0058] Lining thickness and coverage: According to the specific design requirements and geological conditions, adjust the thickness and coverage of the primary lining. Ensure that the concrete cover can completely cover the surface of the underground cavern and provide sufficient anti-seepage performance.

[0059] The thickness of the waterproof coating is set according to the current waterproof grade requirements of the underground cavern, which is completed during the spraying construction:

[0060] During spraying, the spray gun should be perpendicular to the spray base, at a moderate distance, and moved evenly. The spraying should be carried out in the order of detail construction first and then overall spraying, with multiple passes and cross spraying to reach the designed thickness. When constructing on a vertical or sloped surface, the spray gun should spray from bottom to top and from low to high.

[0061] 1) The sprayer should adjust the pressure of each pump and the angle of the gun nozzle according to the instructions. A test spray should be conducted before normal spraying. The main material and the curing agent should be crossed and fully mixed at a distance of 10 cm from the ground. The switches and triggers should be controlled flexibly without jamming, and the discharge of each material should be evenly atomized.

[0062] 2) During normal spraying, the nozzle of the gun should be 60cm away from the construction surface, and the nozzle of the gun should be kept vertical to the construction surface. The spraying speed should be uniform.

[0063] 3) When spraying, it is required to arrange the spraying in the order of bottom surface first, then side surface, and from low to high. When spraying, start from the horizontal gun, and spray in the order of horizontal gun → vertical gun → horizontal gun, using the "cross method" to spray in sequence to the designed thickness.

[0064] 4) The overlap width of each spraying layer is 100mm, and the spraying range at one time is 1 meter in width.

[0065] 5) If there are post-pouring joints, construction joints, settlement joints, deformation joints or structural changes, the spray thickness should be increased by 0.5mm.

[0066] In summary, the invention proposes a construction method for an underground cavern anti-seepage system, which adopts multiple anti-seepage guarantees: the initial lining layer is treated with sprayed anchor concrete to form an initial waterproof barrier; the surface is cleaned and a quick-setting rubber waterproof coating is sprayed to form a waterproof coating; the second phase concrete lining layer provides structural support and further anti-seepage.

[0067] It also realizes intelligent and precise thickness control: according to the acceptance parameter conditions set in advance, the thickness of the waterproof coating is accurately controlled according to the geological conditions and waterproof grade requirements; the thickness ratio of the primary lining layer and the second phase concrete layer is reasonably determined to ensure structural stability and anti-seepage performance; it can take geological conditions and waterproof grade as input, and then output the thickness of the waterproof coating;

[0068] Systematic anti-seepage: Improve the overall anti-seepage performance through comprehensive anti-seepage measures such as structural anti-seepage, leakage blocking, and drainage system; In summary, this set of hierarchical and highly controllable anti-seepage technical solutions can effectively meet the anti-seepage and waterproofing requirements of underground caverns and has good engineering applicability.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. A person skilled in the art may modify the technical solutions described in the above embodiments, or replace part or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method for an underground cavern anti-seepage system, characterized in that: The steps are as follows: Primary lining treatment: Perform the first phase of shotcrete treatment on the current underground cavern to obtain the primary lining; perform leveling and surface cleaning on the current primary lining to obtain the treated primary lining; Two-pass spraying construction: two passes of spraying of quick-setting rubber asphalt waterproof and anti-seepage coating are carried out on the surface of the primary lining layer of the current underground cavern to form a waterproof coating; wherein the thickness of each spraying of the quick-setting rubber asphalt waterproof and anti-seepage coating is 1 mm; Second lining pouring: the thickness of the current waterproof coating is precisely controlled, and after it meets the acceptance parameter conditions, the current waterproof coating is subjected to second-phase concrete spraying treatment to obtain a second-phase concrete layer; Then, the second-phase concrete layer is subjected to formwork support treatment.

2. The construction method of an underground cavern anti-seepage system according to claim 1, characterized in that: The first phase of shotcrete treatment is carried out on the current underground cavern to obtain the primary lining layer. The specific operations are as follows: When the first phase of shotcrete treatment is carried out on the current underground cavern, admixtures are added to the concrete for shotcrete treatment; At the same time, the thickness of the primary lining is controlled, and the ratio of the thickness of the primary lining to the thickness of the second phase concrete layer is between 1:2.2-1:

2.

3. The construction method of an underground cavern anti-seepage system according to claim 1, characterized in that: Before the second lining casting is performed, it also includes preset acceptance parameter conditions; the acceptance parameter conditions include setting the thickness of the waterproof coating according to the current waterproof grade requirements of the underground cavern.

4. The construction method of an underground cavern anti-seepage system according to claim 1, characterized in that: The thickness of the waterproof coating is set according to the waterproof grade requirement of the current underground cavern, specifically comprising: first obtaining a preset empirical data mapping table to obtain geological condition information of the current underground cavern; according to the empirical data mapping table, calling and querying the empirical data mapping table output according to the waterproof grade and geological condition information of the current underground cavern to set the thickness of the waterproof coating; The empirical data mapping table includes waterproof grade, geological condition information and corresponding thickness of waterproof coating.

5. The construction method of an underground cavern anti-seepage system according to claim 1, characterized in that: While performing the second-phase concrete spraying treatment on the current waterproof coating to obtain the second-phase concrete layer, it also includes spraying a coagulant at intervals of a preset time period.

6. The construction method of an underground cavern anti-seepage system according to claim 1, characterized in that: The solidifying agent is a concrete solidifying agent.

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