Construction method for rapid tunneling of underground sump and water pump house

Abstract

The invention relates to the technical field of underground water sump and water pump house construction, in particular to a construction method for rapid tunneling of an underground water sump and water pump house, which comprises the following steps: taking the whole water pump house as a tunneling section, tunneling by adopting a hydraulic tunneling machine, and carrying out threaded steel anchor rod + reinforcing mesh + anchor cable + concrete spraying + concrete arch building support. And safety and stability in the construction process are ensured. The technological process comprises the steps of construction preparation and site arrangement, roadway tunneling through a hydraulic tunneling machine, temporary support installation, anchor net cable permanent support installation, concrete spraying secondary support and concrete arch building permanent support. According to the method, the construction efficiency is remarkably improved, the construction risk and cost are reduced, the safety of surrounding structures is ensured, and good social benefits and economic benefits are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of underground coal mine engineering construction, and in particular to a construction method for rapid excavation of an underground water tank and a water pump room. Background Art

[0002] In the construction of underground mines, especially the construction of water tanks and pump houses, the traditional method is to dig holes and blast them. Although this method can meet the construction needs to a certain extent, the overall construction process is slow and there are high safety risks. In the existing technology, the construction of underground water tanks and pump houses usually adopts multi-stage manual operation and blasting technology, which is not only inefficient, but also may cause stability problems of the roof and side walls, increasing construction risks. In addition, the traditional method also has many inconveniences in the layout of ventilation systems, slag discharge and equipment installation, especially in high-altitude and confined space operations, the safety risks are relatively high. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a construction method for rapid excavation of underground water tanks and water pump houses using a multi-purpose excavator. First, an EBZ-260H multi-purpose excavator is arranged to excavate the water tank channel. After the excavation of the water tank channel is completed, another multi-purpose excavator of the same model is added to excavate the main and auxiliary water tanks at the same time to accelerate the construction progress. At the same time, another multi-purpose excavator is used to excavate the substation channel. Since the top plate of the water pump house tunnel is higher than the top plate of the substation tunnel, excavation starts from the substation channel first. After the substation channel is completed, excavation is carried out from the substation to the water pump house, ensuring that the water pump house is excavated layer by layer from the highest point to avoid high-altitude operations.

[0004] Next, the pump house tunnel was excavated and supported layer by layer according to the designed dimensions. After reaching the installation position of the lifting steel beam, a water drill was used to dig the steel beam hole and the steel beam was installed in time for reinforcement to avoid the safety risks of high-altitude operations in the later stage. When the pump house tunnel was excavated to the water suction well, the pump house and the upper part of the water suction well niche were excavated in full section at one time, and the top plate of the upper part of the water suction well niche was reinforced with anchor cables for secondary support to speed up the construction progress, ensure the smooth ventilation system and slag discharge, and reduce safety risks.

[0005] Finally, continue to pull down the bottom from the niche of the water absorption well until it is connected with the intersection of the main and auxiliary water tank tunnels, and perform secondary anchor cable reinforcement support on the water tank tunnel roof at the connection point to ensure the integrity of the tunnel support. In this way, the overall excavation construction progress is advanced. During this process, the ventilation system is simple in layout, slag is easy to discharge, high-altitude and limited space operations are avoided, and safety risks are reduced. In this way, the present invention not only significantly improves the construction efficiency, but also effectively reduces the potential safety hazards during the construction process, and provides good conditions for subsequent concrete pouring, equipment installation, etc.

[0006] In order to overcome the problems of slow construction progress and great safety hazards in the existing construction process of underground water tanks and water pump rooms, the present invention provides a construction method for rapid excavation of underground water tanks and water pump rooms, which significantly improves construction efficiency, reduces construction risks, and ensures the safety of surrounding structures through advanced excavation technology and optimized construction process.

[0007] The present invention is achieved by adopting the following technical solutions: A construction method for rapid excavation of an underground water tank and a water pump house. On the construction route of the underground water tank and the water pump house, the entire water pump house is regarded as an excavation section, and the excavation section is divided into several cycles. The process flow of each cycle is: construction preparation and site layout → hydraulic tunnel boring machine excavation → installation of temporary support → installation of anchor net cable permanent support → shotcrete secondary support → concrete masonry permanent support.

[0008] According to the construction method for rapid excavation of underground water tanks and water pump rooms provided by the present invention, the initial temporary support includes a front exploration beam and shotcrete. The thickness of the shotcrete is generally 5 cm, and the front exploration beam is temporarily supported by an airborne front exploration beam.

[0009] According to the construction method for rapid excavation of underground water tanks and water pump houses provided by the present invention, the tunnel support adopts threaded steel anchor rods + steel mesh + anchor cables to promptly carry out the first permanent support; after the excavation is completed, the second permanent support of shotcrete + concrete masonry is carried out to ensure safety and stability during the construction process.

[0010] According to the construction method for rapid excavation of underground water tanks and water pump rooms provided by the present invention, the cutting head rotation speed of the hydraulic tunneling machine is 30-40 rpm. The cutting head should be inspected and maintained regularly, and damaged tooth seats and cutting teeth should be replaced in time to ensure its normal operation.

[0011] According to the construction method for rapid excavation of underground water tanks and water pump rooms provided by the present invention, the excavation of the chamber (tunnel) adopts a layered excavation method, the thickness of each layer of excavation is 2-3 meters, and the excavation direction can be horizontal excavation or inclined shaft excavation.

[0012] According to the construction method for rapid excavation of underground water tanks and water pump rooms provided by the present invention, during the construction process, roof delamination meter monitoring points are set at various intersections to monitor the displacement and stress changes of the tunnel roof in real time. The monitoring method includes displacement monitoring or stress monitoring, and the monitoring frequency is at least once a day for observation and recording.

[0013] According to the construction method for rapid excavation of underground water tanks and water pump rooms provided by the present invention, all sub-projects on the construction route can be constructed simultaneously, so as to significantly shorten the construction period and improve the overall construction efficiency. Beneficial Effects

[0014] Conventional construction methods often use blasting excavation and take certain support measures. Once the construction environment changes, the construction conditions are complicated, the construction period is long, the surrounding structures cannot be guaranteed to be safe, and the construction cost increases. The excavation method of the present invention can not only improve the construction efficiency, but also reduce the construction cost. Compared with other processes, this process has fast construction progress, low cost, safety and easy control, has good social and economic benefits, and has promotion value in mine engineering construction.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are 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.

[0017] A construction method for rapid excavation of underground water tanks and pump houses, which significantly improves construction efficiency, reduces construction risks, and ensures the safety of surrounding structures through advanced excavation technology and optimized construction processes.

[0018] First, during the construction preparation and site layout stage, it is necessary to conduct a comprehensive survey and planning of the construction routes of the underground water tank and pump house. After the construction route is determined, the tunnels to be excavated are measured and laid out in detail, and the position of the center line is marked.

[0019] Then the power supply system, transportation system, ventilation system, monitoring system, personnel positioning system, and communication system will be installed, and the compressed air, water supply, and drainage pipelines will be connected to the tunnel opening.

[0020] Next, we enter the excavation stage. Considering that the pump house is an all-rock tunnel, it is recommended to use a hard rock type high-power tunnel boring machine. During the excavation process, the propulsion speed of the tunnel boring machine should be adjusted according to the geological conditions. The speed of the cutting head is 30-40 rpm. The wear of the cutting teeth should be checked every shift. The severely worn cutting teeth should be replaced in time. If the tooth seat of the cutting head is severely worn, the cutting head should be replaced in time to ensure that its normal working progress is not affected. At the same time, during the excavation process, it should be ensured that the internal and external sprays of the tunnel boring machine are turned on normally to reduce the dust concentration on the working face and ensure the health of personnel; if the onboard methane sensor on the tunnel boring machine alarms during the excavation process, the operation should be stopped in time to find out the cause. The operation can only be continued after the hidden dangers are eliminated to ensure construction safety.

[0021] After the tunnel boring machine completes the excavation, the machine-mounted front exploration beam is used for temporary support, and the operators carry out permanent support of the tunnel anchor net under the temporary support. If the tunnel roof is severely broken, it is necessary to spray 5 cm thick concrete for temporary support first, and then carry out permanent support of anchor net after the spraying of concrete is completed.

[0022] Considering the high height of the water pump house tunnel, we excavated the tunnel layer by layer from the highest point of the tunnel, and then began to excavate and support the tunnel layer by layer according to the designed dimensions. We adopted the layered excavation method, and the thickness of each layer was 2-3 meters. During the layered excavation process, the displacement and stress changes of the tunnel should be monitored in real time to ensure construction safety.

[0023] After the pump house tunnel is pulled to the position for lifting the steel beam, a water drill is used to dig the steel beam hole, and the steel beam is installed and reinforced in time. This avoids the need to set up scaffolding for high-altitude lifting, installation, and reinforcement operations in the later stage, and increases safety.

[0024] After the pump house is raised layer by layer to the position of the suction well, the pump house and the upper part of the suction well niche are excavated into place in one full section, and the top plate of the upper part of the suction well niche is reinforced with anchor cables for secondary support.

[0025] After the excavation of the upper part of the water absorption well niche is completed, the water pump house tunnel has reached the design elevation and will no longer be pulled down. The bottom will continue to be pulled down from the water absorption well niche until it intersects with the main and auxiliary water tank tunnels, and the top plate of the water tank tunnel at the intersection will be reinforced with anchor cables for secondary support. This construction can ensure that all water absorption well niches are excavated at one time, and the overall progress of excavation construction is advanced.

[0026] After excavation is completed, the installation design requires that the pump house tunnel be supported with 5 cm thick shotcrete first, and then starting from the water tank water distribution tunnel, from bottom to top, concrete pouring and masonry support shall be carried out for each tunnel and chamber according to the design requirements.

[0027] During the entire construction process, the construction area needs to be monitored in real time to ensure construction safety and the stability of surrounding structures. The construction method for rapid excavation of underground water tanks and pump houses of the present invention, through scientific division of construction sections, efficient excavation of hydraulic tunnel boring machines, multiple protections of initial support and secondary masonry, and real-time monitoring and data processing, not only significantly improves construction efficiency, shortens construction period, reduces construction costs, but also effectively reduces construction risks and ensures the safety of surrounding structures. Compared with conventional construction methods, the method of the present invention has obvious advantages in construction progress, cost and social benefits, and has high promotion value and application prospects.

[0028] For example, in a mine water tank and pump house construction project, the geological conditions are relatively complex. Conventional construction methods use blasting excavation and certain support measures. The construction period is long, the safety of surrounding structures is difficult to ensure, and the construction cost is also high. After adopting the method of the present invention, the construction efficiency is improved by more than 50%, the construction period is shortened by more than 30%, the safety of surrounding structures is effectively guaranteed, and the construction cost is reduced by more than 20%. During the implementation of the project, the construction progress and quality of each excavation section are monitored in real time to ensure the smooth progress of the entire project.

[0029] 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. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method for rapid excavation of underground water tanks and water pump houses, characterized in that: On the construction route of the underground water tank and the water pump room, the entire water pump room is regarded as a tunneling section, and the tunneling section is divided into several cycles. The process flow of each cycle is: construction preparation and site layout → hydraulic tunnel boring machine tunneling → installation of temporary support → installation of anchor net cable permanent support → shotcrete secondary support → concrete masonry permanent support.

2. The construction method according to claim 1, characterized in that: After each excavation cycle, before the permanent support of the anchor net cable, the tunnel that has been excavated needs to be temporarily supported by the front exploration beam to ensure that personnel do not work under the empty roof.

3. The construction method according to claim 1, characterized in that: The cutting head of the hydraulic tunnel boring machine rotates at a speed of 30-40 rpm. The cutting head should be inspected and maintained regularly, and damaged tooth seats and cutting teeth should be replaced in time to ensure its normal operation.

4. The construction method according to claim 1, characterized in that: After the hydraulic tunnel boring machine completes excavation, the first permanent support is carried out in time using threaded steel anchor rods + steel mesh + anchor cables; after the excavation is completed, the second permanent support is carried out using shotcrete + concrete masonry.

5. The construction method according to claim 1, characterized in that: The initial temporary support includes front exploration beams and shotcrete. The thickness of the shotcrete is generally 5 cm, and the front exploration beams are temporarily supported by airborne front exploration beams.

6. The construction method according to claim 1, characterized in that: The excavation of the chamber (tunnel) is carried out in layers, with each layer being 2-3 meters thick, and the excavation direction can be horizontal or inclined.

7. The construction method according to claim 1, characterized in that: After the excavation of the chamber is completed, the secondary permanent support is reinforced concrete masonry, and the thickness of the masonry is generally 50 cm.

8. The construction method according to claim 1, characterized in that: During the construction process, roof delamination meter monitoring points are set up at various intersections to monitor the displacement and stress changes of the tunnel roof in real time. The monitoring methods include displacement monitoring or stress monitoring, and the monitoring frequency is at least once a day.

9. The construction method according to claim 1, characterized in that: All sub-projects on the construction route can be constructed simultaneously to significantly shorten the construction period and improve overall construction efficiency.