Ventilation system of municipal underground pipe ditch

Abstract

The utility model discloses a ventilation system of a municipal underground pipe ditch. Due to the fact that the buried depth is small, the section is small, ventilation facilities are often lost or simplified, and ventilation in an existing comprehensive pipe ditch is not smooth. Working wells of the underground pipe ditch serve as ventilation wells, two ventilation pipes are arranged between every two working wells of the underground pipe ditch and in the lateral direction of the underground pipe ditch, and the ventilation pipes extend out of the ground for ventilation. An unpowered hood is arranged at the top of the ventilation pipe; a concrete buttress is arranged at a bottom elbow of the ventilation pipe for fixing, and a waterproof sleeve is arranged at the side wall of the ventilation pipe penetrating through the underground pipe ditch. The underground pipe trench multi-point natural ventilation system can achieve multi-point natural ventilation of an underground pipe trench, can greatly reduce the temperature in the pipe trench, is very beneficial for discharging waste heat and reducing the temperature in the trench, and meanwhile ensures the safety of inspection and maintenance personnel.

Description

Technical Field

[0001] The utility model belongs to the technical field of ventilation of underground pipe trenches of urban municipal infrastructure, and in particular relates to a ventilation system for municipal underground pipe trenches. Background Art

[0002] In recent years, as the construction of urban underground comprehensive pipeline corridors has returned to rationality, with the purpose of updating and transforming urban underground pipeline networks, eliminating aerial spider webs and pushing overhead lines underground, and concentrating power and communication cables in trenches, the construction of "mini pipeline corridors" - power pipeline trenches and comprehensive pipeline trenches (also known as cable pipeline corridors) with small and flexible cross-sections, shallow burial depths, few ancillary facilities, convenient construction, short construction period, low construction cost, and low operation and maintenance costs has ushered in a golden period of development.

[0003] Many people often confuse integrated pipe trenches with integrated pipe corridors. Integrated pipe trenches are different from traditional integrated pipe corridors. There are great differences between the two in terms of functional positioning, layout type, cross-sectional dimensions, supporting ancillary facilities, and construction cost. At present, my country has not yet issued industry or national design standards for underground pipe trenches. Underground pipe trenches are usually designed with reference to the "Technical Specifications for Urban Integrated Pipe Corridors" GB50838-2015. According to existing technologies, the ventilation facilities of integrated pipe trenches are often not taken seriously due to their shallow burial depth and small cross-section. Their ventilation facilities are often missing or simplified, resulting in very dirty air in the pipe trenches, and harmful gases cannot be discharged. The temperature in the pipe trenches is much higher than the outdoor atmospheric temperature due to heat dissipation and heat accumulation of cables. Sometimes the temperature in the pipe trenches can reach more than 40°C, which is not conducive to the safe operation of cables and cannot guarantee the normal working environment requirements required by personnel during pipe trench inspection and maintenance. Summary of the invention

[0004] In order to make up for the shortcomings of the prior art, the utility model provides a ventilation system for a municipal underground pipe trench. In addition to using the working well of the underground pipe trench as a ventilation well, a lateral ventilation pipe is added between every two working wells to achieve multi-point natural ventilation of the underground pipe trench, which can greatly reduce the temperature in the underground pipe trench, is extremely beneficial for discharging waste heat, reducing the temperature in the trench, and ensuring the safety of cable operation, and at the same time improves the air environment inside the trench to ensure the safety of workers entering the trench during inspection and maintenance.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A ventilation system for a municipal underground pipe trench, characterized in that: the working well of the underground pipe trench is used as a ventilation well, and two ventilation pipes are arranged between every two working wells of the underground pipe trench and on the side of the underground pipe trench, and the ventilation pipes extend out of the ground for ventilation;

[0007] A non-powered hood is arranged on the top of the ventilation pipe.

[0008] Furthermore, the ventilation pipe is led out laterally from the inner wall of the underground pipe trench and extends outward to the green space or landscape belt outside the red line.

[0009] Furthermore, the ventilation pipe is made of D325×8mm seamless steel pipe.

[0010] Furthermore, a concrete pier is provided at the bottom elbow of the ventilation pipe for fixing.

[0011] Furthermore, a waterproof casing is provided at the side wall where the ventilation pipe passes through the underground pipe trench.

[0012] Furthermore, the ventilation pipe and the unpowered hood are connected by a detachable flange.

[0013] Furthermore, the specification of the non-powered hood is 300 type.

[0014] Beneficial effects of the utility model:

[0015] 1) The utility model can realize multi-point natural ventilation of underground pipe trenches, which can greatly reduce the temperature in the pipe trenches, is extremely beneficial for discharging waste heat and reducing the temperature in the trenches, and at the same time ensures the safety of inspection and maintenance personnel;

[0016] 2) When a fire occurs inside an underground trench, the utility model can quickly determine the approximate location of the cable fire point and the size of the fire by looking at the position and concentration of smoke from the ground wind cap;

[0017] 3) In case of fire or emergency, the utility model can use the ventilation pipe as the exhaust pipe or air supply pipe of the ground emergency fan to force exhaust (smoke exhaust) inside the pipe trench or force fresh air into the pipe trench;

[0018] 4) The unpowered hood is driven by natural wind, and the natural rotation generates negative pressure, which improves the ventilation effect. It is also small in size, light in weight, low in noise, zero in energy consumption, rainproof and insect-proof, does not require human operation, and is low-carbon and environmentally friendly.

[0019] 5) The utility model has a simple structure, is easy to construct, has convenient material sources, and has a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the floor plan of the utility model;

[0021] Figure 2 It is a cross-sectional view of the utility model;

[0022] In the figure, 1 is the underground pipe trench; 2 is the working shaft; 3 is the ventilation pipe; 4 is the greening or landscape belt outside the red line; 5 is the non-powered wind hood; 6 is the concrete pier; 7 is the waterproof casing. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with specific implementation methods.

[0024] The utility model provides a ventilation system for municipal underground pipe trenches, which realizes multi-point natural ventilation of underground pipe trenches, removes polluted air in the trenches, ensures the safety of workers during inspection and maintenance of underground pipe trenches, and greatly reduces the temperature in the pipe trenches, which is extremely beneficial for discharging waste heat and reducing the temperature in the trenches. When a fire occurs inside the underground pipe trench, the approximate location of the cable fire point and the size of the fire can be quickly determined by the position and concentration of smoke from the ground wind cap of the ventilation pipe. In addition, in the event of a fire or emergency, the ventilation pipe can be used as an exhaust pipe or air supply pipe for a ground emergency fan to force exhaust (smoke exhaust) inside the underground pipe trench or force fresh air into the underground pipe trench. The ventilation system is set up according to fire protection units, each fire protection unit is divided into working wells, and is controlled at a maximum spacing of 200m. Fire partitions and fire doors are set at the ends of the working wells at the ends of each fire protection unit and at the connection between the pipe trench and the pipe trench.

[0025] like Figure 1 As shown, the utility model is located under the municipal road, and the underground trench 1 is laid under the sidewalk, covered with 0.5-0.7m of soil. The trenching method is generally used for construction. The underground trench 1 mainly lays communication cables and 10KV cables, and a working well 2 is set at a certain distance (generally 120m). When inspecting and maintaining the underground trench 1, in addition to using the working well 2 as a ventilation well and opening the manhole cover of the working well 2 for ventilation, two ventilation pipes 3 are added between every two working wells 2 for ventilation, so that the ventilation spacing is not more than 40m. The entire underground trench constitutes a multi-point natural ventilation system of multiple ventilation wells + multiple ventilation pipes.

[0026] like Figure 2 As shown, the ventilation pipe 3 is led out from the upper inner wall of the underground trench 1, extends outward to the greening or landscape belt 4 outside the red line, exposed to the ground and maintains a reasonable ventilation height with the ground, and the ventilation pipe 3 is organically integrated with the surrounding environment. A non-powered hood 5 is set on the top of the ventilation pipe 3, which is made of 304 stainless steel. The non-powered hood 5 adopts 300 type. The non-powered hood 5 and the ventilation pipe 3 are connected by a detachable flange. When a fire occurs inside the underground trench 1, the non-powered hood 5 can be temporarily removed, and the port of the ventilation pipe 3 can be temporarily connected to the ground emergency fan to force exhaust (smoke exhaust) inside the underground trench 1 or force fresh air to be transported to the underground trench 1. The ventilation pipe 3 adopts D325×8mm seamless steel pipe and adopts enhanced anti-corrosion treatment. L×B×H=800×800×700mm concrete pier 6 is set at the bottom elbow for fixing, and a waterproof casing 7 is set at the side wall of the underground trench 1.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", and "fix" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The content of the utility model is not limited to the examples listed, and any equivalent changes made to the technical solution of the utility model by ordinary technicians in this field after reading the specification of the utility model are covered by the claims of the utility model.

Claims

1. A ventilation system for a municipal underground pipe trench, characterized in that: The working well (2) of the underground pipe trench (1) is used as a ventilation well, and two ventilation pipes (3) are arranged between every two working wells (2) of the underground pipe trench (1) and on the side of the underground pipe trench, and the ventilation pipes (3) extend out of the ground for ventilation; A non-powered hood (5) is arranged on the top of the ventilation pipe (3).

2. A municipal underground pipe trench ventilation system according to claim 1, characterized in that: The ventilation pipe (3) is led out laterally from the inner wall of the underground pipe trench (1) and extends outward to the greening or landscape belt (4) outside the red line.

3. A municipal underground pipe trench ventilation system according to claim 2, characterized in that: The ventilation pipe (3) is made of D325×8mm seamless steel pipe.

4. A municipal underground pipe trench ventilation system according to claim 3, characterized in that: A concrete pier (6) is provided at the elbow at the bottom of the ventilation pipe (3) for fixing.

5. A municipal underground pipe trench ventilation system according to claim 4, characterized in that: A waterproof sleeve (7) is provided at the side wall of the ventilation pipe (3) passing through the underground pipe trench (1).

6. A municipal underground pipe trench ventilation system according to claim 5, characterized in that: The ventilation pipe (3) and the unpowered wind cap (5) are connected by a detachable flange.

7. A municipal underground pipe trench ventilation system according to claim 6, characterized in that: The specification of the non-powered hood (5) is 300 type.

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