Tunnel double-water-curtain enclosed fire extinguishing system

Abstract

The tunnel double-water-curtain enclosed fire extinguishing system comprises a water spraying unit which is orthogonally arranged at the top of a tunnel through a longitudinal truss and a transverse truss, and a first walking driving part of the longitudinal truss and a second walking driving part of the transverse truss are matched with each other to drive the water spraying unit to move to the position over a fire source; the water spraying unit comprises a centrally-positioned inner water spraying part which vertically sprays downwards to form a columnar fire extinguishing water curtain directly reaching a fire source; the outer water spraying component is arranged around the inner water spraying component and sprays downwards to form a peripheral fire-blocking water curtain surrounding a fire source; and the peripheral fire blocking water curtain and the columnar fire extinguishing water curtain form a coaxially nested annular water curtain cavity so as to bind flames in the annular water curtain cavity. Through fire extinguishing and restraining cooperation of the columnar fire extinguishing water curtain which directly reaches a fire source on the inner layer and the fire blocking water curtain which restrains flames and blocks spread on the outer layer, accurate fire extinguishing of the fire source and strong restraining of the combustion range are achieved, and the tunnel fire extinguishing efficiency and safety are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel fire protection facilities, and particularly relates to a tunnel double water curtain enclosing fire extinguishing and fire protection system. Background Art

[0002] Tunnel fires are characterized by rapid spread, smoke accumulation, and difficult extinguishment. Although the existing overhead fire protection systems can spray water by moving to the upper part of the fire source, their extinguishing methods are mostly single nozzles, with limited coverage or scattered water flow, making it difficult to effectively suppress the core of the fire source and block the spread of the flame to the surroundings simultaneously. In addition, fixed or simple mobile water spraying fire extinguishing equipment cannot adjust the protection range according to the size of the fire source, wasting a large amount of water in case of small-scale fires and may have insufficient protection in case of large-scale fires. Moreover, in terms of restraining the flame, high-temperature smoke and flame are prone to spread to the periphery of the fire source, accelerating the expansion of the fire. Summary of the Invention

[0003] Object of the Invention: In order to overcome the deficiencies in the prior art, the present invention provides a tunnel double water curtain enclosing fire extinguishing and fire protection system. Through the cooperation of the columnar fire extinguishing water curtain reaching the fire source directly in the inner layer and the fire blocking water curtain restraining the flame and blocking the spread in the outer layer, accurate fire extinguishment of the fire source and strong restraint of the combustion range are achieved, significantly improving the efficiency and safety of tunnel fire extinguishment.

[0004] Technical Solution: To achieve the above object, a tunnel double water curtain enclosing fire extinguishing and fire protection system of the present invention includes a water spraying unit orthogonally arranged on the top of the tunnel through longitudinal trusses and transverse trusses. The water spraying unit is provided with a water supply system for supplying water to it. The first walking driving part of the longitudinal truss and the second walking driving part of the transverse truss cooperate with each other to drive the water spraying unit to move to directly above the fire source. The water spraying unit includes:

[0005] An inner water spraying component centered, which vertically sprays downward to form a columnar fire extinguishing water curtain reaching the fire source directly;

[0006] An outer water spraying component arranged around the inner water spraying component, which sprays downward to form an outer fire blocking water curtain surrounding the fire source;

[0007] The outer fire blocking water curtain and the columnar fire extinguishing water curtain form a coaxially nested annular water curtain cavity to confine the flame within the annular water curtain cavity.

[0008] Further, the outer water spraying component can expand outward and contract inward to change the size of the surrounding range of the outer fire blocking water curtain to adapt to the size of the fire source, so that the outer fire blocking water curtain maintains a structural form of enclosing the fire source in the top view direction.

[0009] The outer water spraying component sprays vertically downward to form a cylindrical outer fire blocking water curtain surrounding the fire source.

[0010] Further, the outer water spraying component sprays obliquely downward and outward in a diffused manner to form an umbrella-shaped peripheral fire-blocking water curtain surrounding the fire source.

[0011] Further, the outer water spraying component sprays obliquely downward and inward in a converging manner to form an inverted conical peripheral fire-blocking water curtain surrounding the fire source. The inverted conical peripheral fire-blocking water curtain intersects with the columnar fire-extinguishing water curtain at the bottom end, and the intersection position is located at the root of the fire source.

[0012] Further, the inner water spraying component includes a water spraying disc installed on the second traveling driving part; a water spraying switch valve is docked at the water inlet of the water spraying disc, and the water spraying switch valve is connected to the fire hydrant of the water supply system through a water supply pipeline; a plurality of first water spraying holes that are uniform and communicated with the disc cavity are distributed on the bottom of the water spraying disc, and the water spraying disc sprays water vertically downward from the first water spraying holes to form a columnar fire-extinguishing water curtain.

[0013] Further, the outer water spraying component includes a water guiding pipe, a telescopic water spraying pipe, and a radial driving part;

[0014] A water outlet hole is opened on the side of the water inlet of the water spraying disc, the water inlet end of the water guiding pipe is communicated with the water outlet hole, and a plurality of the water guiding pipes are distributed in a circumferential array around the water inlet of the water spraying disc; the telescopic water spraying pipes are distributed between adjacent water guiding pipes, and the rotary joints arranged at both ends of the telescopic water spraying pipes are respectively docked with the water outlet ends of the adjacent water guiding pipes, so that a plurality of telescopic water spraying pipes are distributed in a circumferential array on the periphery of the water spraying disc, and each telescopic water spraying pipe is sequentially connected head to tail through the rotary joint to form a water spraying enclosing pipe located on the periphery of the water spraying disc;

[0015] The pipe section of the water guiding pipe in the radial direction of the water spraying disc has a telescopic pipe section, and the radial driving parts installed on the water spraying disc correspond to the telescopic pipe sections one by one. By driving the telescopic pipe sections to extend or shorten through the radial driving parts, while synchronously driving all the telescopic water spraying pipes to move outward or inward synchronously in the radial direction of the water spraying disc, and driving each telescopic water spraying pipe to horizontally extend or shorten, so that the water spraying enclosing pipe can expand or contract and deform outward in the horizontal plane.

[0016] A plurality of second water spraying holes are uniformly distributed at the bottom of the telescopic water spraying pipe. The telescopic water spraying pipe is composed of at least two spray pipe sections that are sleeved and slidably connected, and there is an overlapping hole area of the second water spraying holes in the sliding and sleeved area of the adjacent spray pipe sections; the water spraying enclosing pipe sprays water downward from the second water spraying holes to form a peripheral fire-blocking water curtain surrounding the fire source, and in the state of the water spraying enclosing pipe expanding or contracting and deforming outward, the surrounding range of the peripheral fire-blocking water curtain can be changed.

[0017] Further, the second water spraying holes are arranged vertically downward, and the water jets ejected from the vertically downward second water spraying holes form the cylindrical peripheral fire-blocking water curtain.

[0018] Furthermore, the second water spray holes are arranged obliquely downward and outward, and the water jets sprayed from each of the second water spray holes obliquely downward and outward form the umbrella-shaped outer fire-blocking water curtain.

[0019] Furthermore, the second water spray holes are arranged obliquely downward and inward, and the water jets sprayed from each of the second water spray holes obliquely downward and inward form the inverted cone-shaped outer fire-blocking water curtain.

[0020] Beneficial effects: The present invention has a double-layer coaxial nested water curtain structure that is precisely positioned directly above the fire source and has a dynamically adjustable range. The inner columnar fire-extinguishing water curtain directly reaches the fire source for core fire extinguishing, and the outer peripheral fire-blocking water curtain forms an encirclement to restrain the flame and block the spread, thereby achieving precise extinguishing of the fire source, strong restraint of the combustion range, and effective isolation of the spread of fire, thereby significantly improving the efficiency and safety of tunnel fire fighting; the high-temperature gases, smoke particles, sparks, etc. generated by the flame and combustion are confined within the annular water curtain, and the lateral spread of the fire is suppressed. The inner columnar fire-extinguishing water curtain directly extinguishes the fire, and the outer peripheral fire-blocking water curtain provides isolation and restraint functions. The isolation effect also has an effect of hindering fresh air from entering the fire source from the side to a certain extent. The restraint effect can also make the inner columnar fire-extinguishing water curtain more concentrated on the fire source, thereby improving the fire extinguishing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the tunnel water fire fighting system of the present invention;

[0022] Figure 2 The overall structure of the water spray unit is shown in Figure 1. Figure 1 ;

[0023] Figure 3 The overall structure of the water spray unit is shown in Figure 1. Figure 2 ;

[0024] Figure 4 It is a schematic diagram of the half-section structure of the water spray unit;

[0025] Figure 5 It is a schematic diagram of the top view of the structure of the outer water spray component of the water spray unit in a state of outward expansion and deformation;

[0026] Figure 6 A schematic diagram of the structure of a water spray unit spraying water to form a columnar fire extinguishing water curtain and a cylindrical outer fire blocking water curtain;

[0027] Figure 7 A schematic diagram of the structure of a water spray unit spraying water to form a columnar fire extinguishing water curtain and an umbrella-shaped outer fire blocking water curtain;

[0028] Figure 8 Schematic diagram of the structure of the water spray unit spraying water to form a columnar fire extinguishing water curtain and an inverted cone-shaped outer fire-blocking water curtain. Detailed Implementation Manner

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] As shown in Figure 1 , Figure 2 and Figure 6 A tunnel double - water - curtain enclosing fire - fighting system includes a water - spraying unit 3 orthogonally arranged at the top of the tunnel through a longitudinal truss 1 and a transverse truss 2. The water - spraying unit 3 is equipped with a water - supply system 4 for supplying water to it. The first walking drive part 5 of the longitudinal truss 1 and the second walking drive part 6 of the transverse truss 2 cooperate with each other to drive the water - spraying unit 3 to move directly above the fire source d. The water - spraying unit 3 includes: an inner water - spraying component 3.1 centered, which vertically sprays downward to form a columnar fire - extinguishing water curtain a directly reaching the fire source d; an outer water - spraying component 3.2 arranged around the inner water - spraying component 3.1, which sprays downward to form an outer fire - blocking water curtain b surrounding the fire source d. The outer fire - blocking water curtain b and the columnar fire - extinguishing water curtain a form a coaxially nested annular water - curtain cavity c to confine the flame within this annular water - curtain cavity c. Through a double - layer coaxially nested water - curtain structure that can be accurately positioned directly above the fire source and has a dynamically adjustable range, the inner columnar fire - extinguishing water curtain a directly reaches the fire source for core fire - extinguishing, and the outer outer fire - blocking water curtain b forms a surrounding circle to confine the flame and block its spread, achieving accurate extinguishment of the fire source, strong constraint on the combustion range, and effective isolation of the fire spread, thereby significantly improving the fire - fighting efficiency and safety in the tunnel. Among them, the flame, high - temperature gases, smoke particles, and sparks generated by combustion are restricted within the annular water - curtain cavity c, inhibiting the lateral spread of the fire. The inner columnar fire - extinguishing water curtain a directly extinguishes the fire, and the outer outer fire - blocking water curtain b provides isolation and confinement functions. The isolation effect also has an effect of hindering fresh air from entering the fire source from the side to a certain extent, and the confinement effect can also make the inner columnar fire - extinguishing water curtain a more concentrated on the fire source d, thereby improving the fire - extinguishing efficiency.

[0031] As shown in 2 and Figure 5 The outer water - spraying component 3.2 can expand outward and contract inward to change the surrounding range of the outer fire - blocking water curtain b to adapt to the size of the fire source d, realizing the dynamic adaptability of the outer fire - blocking water curtain b. When the fire source is small, the outer fire - blocking water curtain b is contracted to reduce the coverage range, saving water while maintaining a tight surrounding of the flame. When the fire source is large, the outer fire - blocking water curtain b is expanded to increase the isolation range, effectively covering a larger fire source d and preventing the fire from breaking through the water curtain, so that the outer fire - blocking water curtain b maintains a structure surrounding the fire source d in the top - view direction, ensuring that regardless of contraction or expansion, the outer fire - blocking water curtain b always forms a complete surrounding circle in the top - view projection direction, maintaining its key enclosing and isolating function and avoiding the appearance of protection gaps.

[0032] As shown in Figure 1 , Figure 2 ,Figure 3 and Figure 4 As shown in Figure 4 , the internal water spraying component 3.1 includes a water spraying disc 30 installed on the second traveling driving part 6; a water spraying switch valve 32 is docked at the water inlet of the water spraying disc 30, and the water spraying switch valve 32 is connected to the fire hydrant 40 of the water supply system 4 through a water supply pipeline; a first water spraying hole 31 which is uniform and communicated with the disc cavity is distributed on the bottom of the water spraying disc 30, and the water spraying disc 30 sprays water vertically downward from the first water spraying hole 31 to form a columnar fire extinguishing water curtain a. The uniform first water spraying holes 31 ensure the formation of a continuous and uniform columnar fire extinguishing water curtain a, and the water spraying switch valve 32 realizes fast start-stop control.

[0033] The water supply system 4 further includes a submersible water pump for drawing water from a water source well, a fire fighting water tank, and a pressurized pump room which are connected through pipelines, and the end is each fire hydrant 40 laid in the tunnel. The fire fighting water tank is provided with a water level sensor to monitor the water level in real time, and when the water level drops to reach the warning line, the submersible water pump is started to replenish water into the fire fighting water tank.

[0034] As Figure 2 、 Figure 3 、 Figure 4As shown, the external water spraying component 3.2 includes a water guiding pipe 8, a telescopic water spraying pipe 9, and a radial driving part 10; a water outlet hole 33 is formed on the water inlet side of the water spraying disc 30, the water inlet end of the water guiding pipe 8 communicates with the water outlet hole 33, and a plurality of the water guiding pipes 8 are distributed in a circumferential array around the water inlet of the water spraying disc 30; the telescopic water spraying pipes 9 are distributed between adjacent water guiding pipes 8, and the rotary joints 93 arranged at both ends of the telescopic water spraying pipe 9 are respectively butted with the water outlet ends of the adjacent water guiding pipes 8, so that a plurality of telescopic water spraying pipes 9 are distributed in a circumferential array on the periphery of the water spraying disc 30, and each telescopic water spraying pipe 9 is sequentially connected head to tail through the rotary joint 93 to form a water spraying enclosure pipe 90 located on the periphery of the water spraying disc 30; the pipe section part of the water guiding pipe 8 in the radial direction of the water spraying disc 30 has a telescopic pipe section 80, and the radial driving parts 10 installed on the water spraying disc 30 correspond to the telescopic pipe sections 80 one by one. By driving the telescopic pipe section 80 to extend or contract through the radial driving part 10, while synchronously driving all the telescopic water spraying pipes 9 to move outward or inward synchronously in the radial direction of the water spraying disc 30, the telescopic water spraying pipes 9 are driven to horizontally extend or contract, ensuring the continuity of the water spraying enclosure pipe 90, so that the water spraying enclosure pipe 90 can expand or contract outward or inward in the horizontal plane, ensuring that the entire water spraying enclosure pipe 90 expands or contracts uniformly and synchronously, and maintaining the continuity and integrity of the peripheral fire blocking water curtain b. A plurality of second water spraying holes 91 are evenly distributed at the bottom of the telescopic water spraying pipe 9, and the telescopic water spraying pipe 9 is composed of at least two sections of water spraying pipe sections sleeved and slidably connected, and there is a covering overlapping hole area 910 of the second water spraying holes 91 in the sliding and sleeved area of the adjacent water spraying pipe sections; the water spraying enclosure pipe 90 sprays water downward from the second water spraying holes 91 to form a peripheral fire blocking water curtain b surrounding the fire source d, and when the water spraying enclosure pipe 90 expands or contracts outward or inward, the surrounding range of the peripheral fire blocking water curtain b can be changed. During the telescopic process of the telescopic water spraying pipe 9, through the covering overlapping hole area 910, there is always a second water spraying hole 91 in the working state and covering the lower area, completely avoiding the generation of water spraying blind areas or gaps due to the telescopic action, ensuring the integrity and continuity barrier structure of the peripheral fire blocking water curtain b surrounding the fire source d, and being the core guarantee for realizing effective dynamic isolation.

[0035] As Figure 4As shown in the figure, the water supply to the water spraying enclosure pipe 90 is controlled by a ring valve 11 provided at the water inlet of the water spraying disc 30. In the case of extremely small fire or when the peripheral fire blocking water curtain b is not required, the ring valve 11 can be closed, thereby blocking each water outlet hole 33. Only the water spraying disc 30 needs to be supplied with water, and the columnar fire extinguishing water curtain a can be used to extinguish the fire, reducing water resource waste. The ring valve 11 includes an annular valve plug 111 and a valve drive 112. The valve drive 112 can be an electric push rod optionally installed on the side of the water inlet of the water spraying disc 30. The annular valve plug 111 is coaxially arranged with the water inlet of the water spraying disc 30. An annular valve groove corresponding to the annular valve plug 111 is provided on the end face of the water inlet of the water spraying disc 30. The annular valve groove penetrates the water outlet hole 33, and the annular valve plug 111 is in sliding sealing fit with the annular valve groove. Driven by the electric push rod, the annular valve plug 111 moves downward to block the water outlet hole 33 to close the valve, and the annular valve plug 111 moves upward to open the water outlet hole 33 to open the valve.

[0036] Figure 5 Fig. is a top view structural schematic diagram of the outer water spraying component 3.2 in the outward expansion and deformation state, that is, a structural schematic diagram of the expansion and deformation of the water spraying enclosure pipe 90 of the outer water spraying component 3.2. Taking Figure 5 as an example, the principle of expansion and deformation is briefly described as follows: Based on the size of the fire source d, it is judged whether to adjust the deformation of the water spraying enclosure pipe 90. When the fire source d cannot be enclosed, the expansion and deformation adjustment needs to be carried out. At this time, each radial drive part 10 drives each telescopic pipe section 80 to synchronously radially elongate, thereby synchronously driving all the telescopic water spraying pipes 9 to move outward synchronously in the radial direction of the water spraying disc 30. At the same time, each telescopic water spraying pipe 9 is driven to horizontally elongate synchronously, so as to complete the outward expansion and deformation adjustment of the water spraying enclosure pipe 90. The ultimate goal is to realize the adjustment of the enclosure range size of the peripheral fire blocking water curtain b, accurately adapt to different scales of fire sources d, and avoid insufficient protection or water source waste.

[0037] In the present invention, there are three embodiments of the shape of the peripheral fire blocking water curtain b, as follows:

[0038] The first embodiment: As Figure 6 shown, the outer water spraying component 3.2 sprays vertically downward to form a cylindrical peripheral fire blocking water curtain b1 surrounding the fire source d. The barrier of the cylindrical peripheral fire blocking water curtain b1 is more solid and has good continuity, high barrier strength, good blocking effect. The vertical downward spraying is relatively less affected by air flow, and the water curtain form is more stable, reaching from the top to the ground (or close to the ground), effectively covering the entire tunnel height and preventing the flame from escaping from below or the side of the water curtain. Correspondingly, the second water spraying holes 91 are arranged vertically downward, and the water jets ejected from each vertically downward second water spraying hole 91 form the cylindrical peripheral fire blocking water curtain b1.

[0039] The second embodiment: As Figure 7As shown, the outer water spraying component 3.2 sprays obliquely downward and diffuses outward to form an umbrella-shaped outer fire-blocking water curtain b2 surrounding the fire source d. The obliquely outward diffusion spraying enables the water curtain to cover a larger horizontal area at a lower height, which is very effective for areas where the initial fire source is small but the spread risk is high, or for scenarios where a large-scale isolation zone needs to be quickly established to prevent the fire from spreading to vehicles and goods on both sides. Moreover, the falling water droplets can wet the ground outside the water curtain and potential combustibles within reach in advance, forming a "wet defense line" to reduce the risk of being ignited. Correspondingly, the second water spraying holes 91 are arranged obliquely downward and outward, and the water jets ejected from the second water spraying holes 91 that are obliquely downward and outward form the umbrella-shaped outer fire-blocking water curtain b2.

[0040] Third Embodiment: As Figure 8 shown, the outer water spraying component 3.2 sprays obliquely downward and converges inward to form an inverted conical outer fire-blocking water curtain b3 surrounding the fire source d. The inverted conical outer fire-blocking water curtain b3 intersects with the columnar fire extinguishing water curtain a at the bottom, and the intersection position is at the root of the fire source d. The inner and outer water curtains intersect at the root of the fire source d, closing the bottom of the annular water curtain cavity c and forming an almost closed fire extinguishing space, which can maximize the binding effect, making it difficult for the flame and hot air to escape; the nearly closed bottom can also hinder the entry of air (or a large amount of air) from the bottom into the fire source core to promote the extinguishment of the flame; the converging water flow of the outer inverted conical outer fire-blocking water curtain b3 and the inner columnar fire extinguishing water curtain a act together on the root of the fire source d, strengthening the water supply volume and cooling effect in the core fire extinguishing area; the water flows finally converge to the key root area of the fire source d, improving the fire extinguishing efficiency. Correspondingly, the second water spraying holes 91 are arranged obliquely downward and inward, and the water jets ejected from the second water spraying holes 91 that are obliquely downward and inward form the inverted conical outer fire-blocking water curtain b3.

[0041] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A tunnel double water curtain enclosing fire extinguishing and fire fighting system, comprising a water spraying unit (3) orthogonally arranged at the top of the tunnel through a longitudinal truss (1) and a transverse truss (2). The water spraying unit (3) is provided with a water supply system (4) for supplying water to it. The first walking driving part (5) of the longitudinal truss (1) and the second walking driving part (6) of the transverse truss (2) cooperate with each other to drive the water spraying unit (3) to move directly above the fire source (d), and it is characterized in that: The water spraying unit (3) includes: An internally located water spraying component (3.1) centered, which vertically sprays downward to form a columnar fire extinguishing water curtain (a) directly reaching the fire source (d); An externally located water spraying component (3.2) arranged around the internally located water spraying component (3.1), which sprays downward to form a peripheral fire blocking water curtain (b) surrounding the fire source (d); The peripheral fire blocking water curtain (b) and the columnar fire extinguishing water curtain (a) form a coaxially nested annular water curtain cavity (c) to confine the flame within the annular water curtain cavity (c).

2. The tunnel double water curtain enclosing fire extinguishing and fire protection system according to claim 1, characterized in that: The externally located water spraying component (3.2) can expand outward and contract inward to change the surrounding range of the peripheral fire blocking water curtain (b) to adapt to the size of the fire source (d), so that the peripheral fire blocking water curtain (b) maintains a structure form that encloses the fire source (d) in the top view direction.

3. The fire extinguishing and fire protection system of double water screens enclosing a tunnel according to claim 2, wherein: The externally located water spraying component (3.2) sprays vertically downward to form a cylindrical peripheral fire blocking water curtain (b1) surrounding the fire source (d).

4. A tunnel double water curtain enclosing fire extinguishing and fire fighting system according to claim 2, characterized in that: The externally located water spraying component (3.2) sprays obliquely downward and outward to form an umbrella-shaped peripheral fire blocking water curtain (b2) surrounding the fire source (d).

5. The fire extinguishing and fire protection system for surrounding a tunnel with double water curtains according to claim 2, characterized in that: The externally located water spraying component (3.2) sprays obliquely downward and inward to form an inverted conical peripheral fire blocking water curtain (b3) surrounding the fire source (d). The inverted conical peripheral fire blocking water curtain (b3) intersects with the columnar fire extinguishing water curtain (a) at the bottom end, and the intersection position is at the root of the fire source (d).

6. A tunnel double water curtain enclosing fire extinguishing and fire protection system according to claim 2, characterized in that: The internally located water spraying component (3.1) includes a water spraying disc (30) installed on the second traveling driving part (6); a water spraying switch valve (32) is docked at the water inlet of the water spraying disc (30), and the water spraying switch valve (32) is connected to the fire hydrant (40) of the water supply system (4) through a water supply pipeline; a first water spraying hole (31) that is uniform and communicates with the disc cavity is distributed on the bottom of the water spraying disc (30), and the water spraying disc (30) sprays water vertically downward from the first water spraying hole (31) to form a columnar fire extinguishing water curtain (a).

7. A tunnel double water curtain enclosing fire extinguishing and fire fighting system according to claim 6, characterized in that: The externally located water spraying component (3.2) includes a water guiding pipe (8), a telescopic water spraying pipe (9), and a radial driving part (10); A water outlet hole (33) is opened on the side of the water inlet of the water spraying disc (30), the water inlet end of the water guiding pipe (8) is communicated with the water outlet hole (33), and a plurality of the water guiding pipes (8) are distributed in a circumferential array around the water inlet of the water spraying disc (30); the telescopic water spraying pipes (9) are distributed between adjacent water guiding pipes (8), and rotary joints (93) arranged at both ends of the telescopic water spraying pipes (9) are respectively docked with the water outlet ends of the adjacent water guiding pipes (8), so that a plurality of telescopic water spraying pipes (9) are distributed in a circumferential array on the periphery of the water spraying disc (30), and each telescopic water spraying pipe (9) is successively connected head to tail through the rotary joint (93) to form a water spraying enclosing pipe (90) located on the periphery of the water spraying disc (30); The pipe section of the water guide pipe (8) in the radial direction of the water spraying disc (30) has telescopic pipe sections (80). The radial driving parts (10) installed on the water spraying disc (30) correspond to the telescopic pipe sections (80) one by one. By driving the telescopic pipe sections (80) to extend or contract through the radial driving parts (10), while synchronously driving all the telescopic water spraying pipes (9) to move outward or inward synchronously in the radial direction of the water spraying disc (30), each telescopic water spraying pipe (9) is driven to extend or contract horizontally, so that the water spraying enclosure pipe (90) can expand and deform outward or contract and deform inward in the horizontal plane; A number of second water spraying holes (91) are evenly distributed at the bottom of the telescopic water spraying pipe (9). The telescopic water spraying pipe (9) is composed of at least two sections of water spraying pipe sections sleeved and slidably connected, and there is an overlapping hole area (910) of the second water spraying holes (91) in the sliding and sleeved area of adjacent water spraying pipe sections; The water spraying enclosure pipe (90) sprays water downward from the second water spraying holes (91) to form an outer peripheral fire-blocking water curtain (b) surrounding the fire source (d), and the surrounding range of the outer peripheral fire-blocking water curtain (b) can be changed in the state that the water spraying enclosure pipe (90) expands and deforms outward or contracts and deforms inward.

8. A tunnel double water curtain enclosing fire extinguishing and fire fighting system according to claim 7, characterized in that: The second water spraying holes (91) are arranged vertically downward, and the water jets ejected from the vertically downward second water spraying holes (91) form the cylindrical outer peripheral fire-blocking water curtain (b1).

9. A tunnel double water curtain enclosing fire extinguishing and fire fighting system according to claim 7, characterized in that: The second water spraying holes (91) are arranged obliquely downward and outward, and the water jets ejected from the obliquely downward and outward second water spraying holes (91) form the umbrella-shaped outer peripheral fire-blocking water curtain (b2).

10. A tunnel double water curtain enclosing fire extinguishing and fire protection system according to claim 7, characterized in that: The second water spraying holes (91) are arranged obliquely downward and inward, and the water jets ejected from the obliquely downward and inward second water spraying holes (91) form the inverted conical outer peripheral fire-blocking water curtain (b3).

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