Wind shield for suction opening of underground powerhouse
By designing a wind barrier at the air outlet of the underground factory, including fences, ventilation tubes and pressure relief windows, the problems of poor ventilation and easy fence damage are solved, and efficient ventilation and construction safety are achieved.
Patent Information
- Application Number
- CN202422301221.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-20
AI Technical Summary
The air outlets of existing underground factory buildings lack effective wind barriers, resulting in poor ventilation and smoke exhaust, which can easily cause negative pressure losses and external airflow backflow. At the same time, the simple enclosure is easily damaged during construction blasting.
A wind barrier is designed, including a fence, a ventilation tube, a pressure relief window and a manhole. The fence is fixed to the wall of the hole through anchor bars. The ventilation tube is connected to the exhaust fan. The pressure relief window and manhole are equipped with a windproof quilt, and the bracket and steel support enhance structural stability.
Effectively prevent negative pressure loss of air outlets and backflow of external airflow, ensure ventilation quality, and discharge airflow through pressure relief windows and manholes during construction blasting, protecting the wind barrier from damage.
Smart Images
Figure CN223119109U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of hydropower construction, and particularly relates to a wind shielding barrier for the air extraction opening of an underground powerhouse. Background Art
[0002] The underground powerhouse of a pumped storage power station is characterized by a large chamber cross-section, a long excavation period, and the intersection of multiple chambers with side walls. Therefore, during the construction period, a combined ventilation method of forced ventilation and exhaust ventilation is mostly adopted. However, in actual construction, many air extraction openings of underground powerhouses do not have a wind shielding barrier or only adopt a simple iron sheet enclosure structure. On the one hand, it is impossible to effectively maintain the ventilation and smoke exhaust effect, easily causing negative pressure loss at the air extraction opening and reverse inflow of external air; on the other hand, due to a large number of blasting operations during the construction of the underground powerhouse, the air flow generated by frequent blasting is very likely to cause the overturning and damage of the simple enclosure. Content of the Utility Model
[0003] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a wind shielding barrier for the air extraction opening of an underground powerhouse. On the basis of ensuring low cost, the utility model can effectively improve the ventilation and smoke exhaust quality of the underground powerhouse, and at the same time meet the requirements of the construction environment for the safety, applicability and durability of the wind shielding barrier.
[0004] To achieve the above purpose, the utility model provides the following technical solutions:
[0005] A wind shielding barrier for the air extraction opening of an underground powerhouse, the wind shielding barrier includes a baffle plate arranged at the top end wall of the underground powerhouse and used for blocking the ventilation chamber, and the side of the baffle plate is closely attached to the contour line of the chamber and connected to the chamber wall through fastening anchor bars;
[0006] Relief windows are symmetrically arranged on the baffle plate body relative to the chamber axis, through holes are arranged on the baffle plate body above the relief windows, and ventilation ducts are assembled in the through holes.
[0007] Preferably, a suction fan is installed at one end of the ventilation duct facing the underground powerhouse, and the other end away from the underground powerhouse is erected on a support, and the bottom of the support is fixedly arranged on the chamber floor and has a gap with the baffle plate.
[0008] Preferably, the two sides of the top of the support are connected to the top ends of inclined steel supports, and the bottom ends of the steel supports are inserted into the chamber wall.
[0009] Preferably, an anti-collision mesh cover is also covered at the port of the end of the ventilation duct where the suction fan is installed, and the anti-collision mesh cover is fixedly connected to the baffle plate. The anti-collision mesh cover can effectively prevent blasting flying stones from damaging the fan.
[0010] Preferably, a manhole is also opened at the bottom of the baffle plate.
[0011] Preferably, the panel surface of the enclosure plate away from the underground factory building is also provided with a windshield quilt at the corresponding pressure relief window and manhole, the top and bottom ends of the windshield quilt are fixedly connected to the enclosure plate, and the bottom end is freely hanging and covers the corresponding pressure relief window or manhole.
[0012] Compared with the prior art, the utility model has the following advantages:
[0013] 1) The manufacturing materials are easy to obtain and the cost is low. The enclosure plate can be made of the iron sheet enclosure in the existing technology and its shape can be adapted to the cross section of the cavern. The enclosure plate can be installed with anchor bars to ensure the close connection between the enclosure plate and the cavern. At the same time, the bracket can be made of I-beams and the steel support can be made of steel bars;
[0014] 2) The baffle is located on the top end wall of the underground powerhouse and can be used as a high-altitude edge protection to improve the safety of operations in the lower part of the powerhouse. At the same time, the baffle effectively blocks the ventilation hole (i.e., the exhaust port) to prevent negative pressure loss at the exhaust port and backflow of external air. At the same time, the ventilation pipe, as an air duct connecting the underground powerhouse and the cavern, can effectively discharge the airflow and smoke inside the underground powerhouse to ensure the air quality inside the underground powerhouse;
[0015] 3) The pressure relief windows and manholes on the baffles are covered with windproof blankets, which can ensure that the baffles cover the cavern under normal conditions. However, when blasting is carried out during construction of the underground plant, the blasting airflow can be discharged from the pressure relief windows and manholes, preventing the airflow from acting on the baffles and causing the baffles to fail to cover the cavern. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the windshield described in the specific implementation method;
[0017] Figure 2 for Figure 1 A schematic diagram of the windshield shown is a left-angle view;
[0018] Note: Figure 2 The middle mark C stands for "underground plant side" and "D" stands for the cavern direction side. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0020] like Figure 1-2 As shown, a wind barrier for an air vent of an underground powerhouse, the wind barrier comprises a baffle plate 1 which is arranged at the top end wall of the underground powerhouse and blocks the ventilation cavern, the baffle plate side of which is arranged closely against the cavern contour line 4 and connected to the cavern wall by fastening anchor bars 12;
[0021] On the plate body of the baffle 1, pressure relief windows 13 are symmetrically arranged relative to the axis of the chamber. A manhole 14 is also provided at the bottom of the baffle. On the plate surface of the baffle 1 away from the underground power house, windproof cotton quilts 15 are provided at the corresponding positions of the pressure relief windows 13 and the manhole 14. The top and bottom ends of the windproof cotton quilt 15 are fixedly connected to the baffle 1, and the bottom end hangs freely to cover the corresponding pressure relief window 13 or manhole 14.
[0022] On the plate body of the baffle 1 above the pressure relief window 13, through holes are provided and ventilation ducts 3 are assembled in the through holes. One end of the ventilation duct 3 facing the underground power house is equipped with an exhaust fan 31, and the end away from the underground power house is erected on a support 2. The bottom of the support 2 is fixedly arranged on the floor of the chamber and there is a gap with the baffle 1. The two sides of the top of the support 2 are connected to the top ends of the inclined steel supports 11. The bottom ends of the steel supports 11 are inserted into the wall of the chamber. An anti-collision net cover 16 is also sleeved at the port of the end of the ventilation duct 3 where the exhaust fan 31 is provided. The anti-collision net cover 16 is fixedly connected to the baffle 1.
[0023] The working process of this embodiment is as follows:
[0024] Through the effective sealing of the ventilation opening chamber, that is, the air extraction opening, by the baffle, the negative pressure loss of the air extraction opening and the reverse flow of the external air flow are prevented. At the same time, as the air duct connecting the underground power house and the chamber, the ventilation duct can effectively discharge the air flow and soot inside the underground power house, ensuring the air quality inside the underground power house; the pressure relief windows and manholes on the baffle are covered by windproof cotton quilts, which can ensure the covering of the chamber by the baffle under normal conditions. However, when blasting is carried out during the construction of the underground power house, the blasting air flow can be discharged from the pressure relief windows and manholes, preventing the air flow from acting on the baffle and causing the covering of the chamber by the baffle to fail.
[0025] The following is the specific application of the present utility model in a pumped-storage power station water conveyance and power generation system project in a certain place:
[0026] The maximum excavation size of the underground power house of this project is: 168.6m×26m×26.4m (length×width×height). After excavating downward on the second floor of the underground power house, a 2*135KW forced draft axial flow fan is used to supply air inward in the access tunnel to the power house, and a 2*110kw exhaust axial flow fan is used to exhaust air outward in the ventilation and safety tunnel (i.e., the air extraction opening).
[0027] (1) According to the cross-sectional size of the ventilation and safety tunnel chamber, make an iron sheet baffle that fits the cross-section of the chamber and firmly fix it to the chamber wall through anchor bars. The distance from the edge of the baffle is not less than 1.2m;
[0028] (2) According to the installation height and size of the exhaust axial flow fan, open through holes at the corresponding positions of the baffle and install ventilation ducts in the through holes.
[0029] (3) Install an I20 steel beam fan support with a height of 5.7 m and a width of 1.9 m at the axis position of the chamber. The distance between the support and the baffle is 0.4 m to 1 m, and the top is firmly fixed to the fan body.
[0030] (3) Open two pressure relief windows with dimensions of 1.7 m × 2 m at a height of 3.3 m above the ground. The position of the pressure relief windows should avoid the fan support.
[0031] (4) Open a manhole with dimensions of 1.2 m × 1.6 m at a height not less than 20 cm above the ground.
[0032] (5) Install windproof cotton quilts at the pressure relief windows and manholes according to the sizes of the pressure relief windows and manholes. The size of the windproof cotton quilts should be more than 30 cm larger than the window edges.
[0033] (6) Finally, install a steel wire anti-collision mesh cover at the port of the ventilation pipe on the side facing the underground power house to prevent flying stones generated by internal blasting in the underground power house from hitting the fan.
Claims
1. A wind barrier for the air extraction opening of an underground powerhouse, characterized in that The windbreak includes a baffle plate arranged at the top end wall of the underground power house and used for plugging the ventilation chamber. The side of the baffle plate is closely attached to the contour line of the chamber and is connected to the chamber wall through fastening anchor bars. Relief windows are symmetrically arranged on the baffle plate body relative to the axis of the chamber. Through holes are arranged on the baffle plate body above the relief windows, and ventilation ducts are assembled in the through holes.
2. The wind shield of the exhaust air opening of the underground powerhouse according to claim 1, characterized in that, A suction fan is installed at one end of the ventilation duct facing the underground power house, and the other end away from the underground power house is erected on a support. The bottom of the support is fixedly arranged on the chamber floor and there is a gap with the baffle plate.
3. The wind barrier for the air extraction opening of the underground powerhouse according to claim 2, characterized in that, Both sides of the top of the support are connected to the top ends of inclined steel supports, and the bottom ends of the steel supports are inserted into the chamber wall.
4. The wind barrier for the exhaust air opening of the underground powerhouse according to claim 2, characterized in that, A collision-proof net cover is also covered at the port of the end of the ventilation duct where the suction fan is installed, and the collision-proof net cover is fixedly connected to the baffle plate.
5. The windscreen barrier for the exhaust air opening of the underground powerhouse as described in claim 1, wherein A manhole is also opened at the bottom of the baffle plate.
6. The windbreak of the air extraction opening of the underground power house according to claim 5, wherein a windproof cotton quilt is also arranged on the plate surface of the baffle plate away from the underground power house at the corresponding positions of the relief windows and the manhole. The top and bottom ends of the windproof cotton quilt are fixedly connected to the baffle plate, and the bottom end freely hangs down to cover the corresponding relief window or manhole.