Mouse trap

Abstract

The aim is to provide a mouse trap that captures mice by utilizing the five senses and physical abilities of mice, such as sight, smell, touch, hearing, taste, agility, and jumping ability, using an adhesive trapping sheet attached to the inner wall of a tunnel-shaped tube with an open floor. [Solution] The present invention consists of a tunnel body, an adhesive capture sheet, and a collision sound generating device, and the tunnel body has a required length with an open floor surface. and entrances at the front and rear The adhesive trapping sheet consists of a tunnel-shaped cylindrical body formed therein, and is laminated with an adhesive layer release film, an easily peelable adhesive layer, an adhesive layer, and an adhesive layer release film, with the easily peelable adhesive layer being attached to the adhesive projection ribs formed on the inner wall of the tunnel cylindrical body, and the entire area of ​​the adhesive layer is provided with cut slits that are divided while remaining partially connected. The collision sound generating device is installed near the upper central part of the tunnel body and consists of a balance suspension rod with a suspension bait section and an elastic body connected to a weight. Take action.

Description

Technical Field

[0001] The present invention relates to a mouse trap that captures mice by using the five senses and physical abilities of mice, such as vision, smell, touch, hearing, taste, agility, and jumping ability, and capturing them with an adhesive capture sheet attached to the inner wall of a tunnel cylinder with an open floor surface.

Background Art

[0002] Conventional means for capturing mice include a wire cage type that hangs bait in a capture cage made of wire mesh to attract mice into the cage and capture them, an assembled box type that lays an adhesive capture sheet in a box-shaped box assembled from cardboard to capture mice, a sensor detection type that uses an electric capture means such as an optical sensor, and an adhesive capture sheet type that attaches an adhesive layer to a plate-shaped sheet material to capture mice. A variety of traps are provided.

[0003] However, the above-mentioned wire cage type mouse trap captures mice while they are alive, so when recovering the trap, the mice must be disposed of by killing, which requires unpleasant disposal work such as killing. In addition, the assembled box type mouse trap has a structure in which an adhesive capture sheet is laid on the bottom surface of the mouse trap, so mice with excellent vision, smell, touch, hearing, and taste are wary of the adhesive capture sheet laid on the bottom surface, and there is a problem that the capture probability tends to be low. In addition, the sensor detection type mouse trap using an optical sensor has problems such as being expensive itself and requiring maintenance costs and device maintenance work due to using electricity during use. In addition, the adhesive capture sheet type mouse trap needs to lay a large amount of adhesive capture sheets on a wide space in order to capture mice with excellent agility and jumping ability, which causes problems such as an increase in work hours and high costs. Therefore, proposals for mouse traps that solve these problems have been made.

[0004] Regarding the above-mentioned cage-type rat trap, for example, there is a known "rat trap" (Patent Document 1) which consists of a trapping cage with an opening / closing lid at the entrance for rats, and a baiting part suspended inside the trapping cage and capable of engaging with the opening / closing lid, wherein the opening / closing lid, which is in an open / locked position by the movement of the baiting part, can be closed by the biasing force of a spring.

[0005] However, the proposed "rat trap" has a structure in which a removal tube is attached to the side wall near the bottom of the trap cage, which communicates with the inside of the trap cage and has a hollow section into which rats can enter, and the removal tube has an opening and closing gate plate that can be opened and closed only by operation from outside the tube, allowing the hollow section to be opened and closed, and a trap bag can be attached to the end of the trap. However, since rats are captured while still alive, they must be killed when the trap is disposed of, which is a problem as it requires the unpleasant disposal work of killing animals, as well as hygiene problems due to reuse, and there are also problems with the unit price, transportability and storage.

[0006] Furthermore, regarding proposals for modular box-type mouse traps, for example, there is a known technology called "Mouse trapping attractant and method for trapping mice" (Patent Document 2), which allows for the preparation of various attractant components with stable and uniform quality, and can be used as a substitute for bait that effectively exhibits the function of the attractant components.

[0007] However, the proposed "mouse trapping attractant and method of trapping mice" involves a carrier body holding an attractant component consisting of at least one aromatic blended flavor, which can be used as a substitute for food. The method of trapping mice involves placing the aforementioned trapping attractant inside an adhesive trap, luring mice with the scent of the trapping attractant, and trapping the mice that enter with the adhesive layer. However, because the adhesive layer is provided on the bottom of the adhesive trap, there is a drawback in that mice, which have excellent sight, smell, touch, hearing, and taste senses, may become wary of the change in the material of the bottom surface.

[0008] Furthermore, regarding proposals for sensor-detecting mouse traps using optical sensors, for example, there is a known technology called "Mouse trap using optical sensors" (Patent Document 3) which solves the problem that conventional traps, which have a tunnel-like floor structure and use two sensors, or use an air compressor, are large-scale equipment requiring space and significant costs, making them unsuitable for ordinary households.

[0009] However, the proposed "mouse trap using an optical sensor" is a sealed, box-shaped mouse trap with an openable and closable shutter on one side of the trap box. An optical sensor that detects changes in infrared radiation is placed on the top of the trap box, and when a mouse enters the trap box, the power turns on even if the mouse does not eat the bait, and the shutter at the entrance of the trap closes instantly. However, the trap itself is expensive because it is equipped with electrical control equipment, and it has problems such as requiring economical maintenance costs and device upkeep because it uses electricity when in use.

[0010] Furthermore, regarding proposals for sticky trap sheet type mouse traps, for example, there is a known technology called "sticky trap sheet for mouse capture" (Patent Document 4) which can efficiently capture mice.

[0011] However, the proposed "sticky trap sheet for catching mice" is a sticky trap sheet with an adhesive layer formed on its surface. By making this adhesive layer out of a dark-colored adhesive, the light reflected by the sticky trap sheet can be suppressed, so mice do not become wary. As a result, mice approach the sticky trap sheet without hesitation and are eventually captured. However, in order to capture mice, which have excellent agility and jumping ability, it is necessary to cover a large area with a large number of sticky trap sheets, which leads to problems such as increased labor costs and higher costs.

[0012] Furthermore, regarding proposals for sticky sheet type mouse traps, the applicant's "mouse trap" (Patent Document 5), which captures mice by attaching a sticky sheet to the inner wall of a tunnel-shaped body with an open floor, is known technology.

[0013] However, the proposed "mouse trap" did not work because the bell sound produced by the sound-generating device was too quiet and gentle to startle the mice and cause them to jump. In addition, there were problems with setting up the trap, such as the folds getting tangled in the hands. The present invention aims to solve the above-mentioned problems and propose a mouse trap that improves the capture rate by newly incorporating a trap-type mechanism.

[0014] The applicant focused on the fact that mice have excellent sight, smell, touch, hearing, and taste, as well as superior agility and jumping ability, and conceived the idea of ​​easily capturing them by utilizing their five senses and physical abilities. As a result, the applicant developed a mouse trap that captures mice using an adhesive trapping sheet attached to the inner wall of a tunnel-shaped tube with an open floor, utilizing the five senses and physical abilities of mice, such as sight, smell, touch, hearing, taste, agility, and jumping ability, leading to the proposal of the "mouse trap" in this application. [Prior art documents] [Patent Documents]

[0015] [Patent Document 1] Japanese Patent Publication No. 2002-330688 [Patent Document 2] Japanese Patent Publication No. 2002-17232 [Patent Document 3] Utility Model Registration No. 3100008 Gazette [Patent Document 4] Utility Model Registration No. 3066961 Gazette [Patent Document 5] Patent No. 5315471

Summary of the Invention

Problems to be Solved by the Invention

[0016] In view of the above problems, the present invention aims to provide a mouse trap that captures mice by using the five senses and physical abilities of mice, such as vision, smell, touch, hearing, taste, agility, and jumping ability, with an adhesive capture sheet attached to the inner wall of a tunnel cylinder with an open floor surface.

Means for Solving the Problems

[0017] The present invention of The mouse trap is a mouse trap composed of a tunnel cylinder, an adhesive capture sheet, and a collision sound generating device. The tunnel cylinder has a required length with an open floor surface and entrances at the front and rear and is formed of a tunnel-shaped cylinder. The adhesive capture sheet is laminated with an adhesive layer release film, an easily peelable adhesive layer, an adhesive layer, and an adhesive layer release film. The easily peelable adhesive layer is adhered to the attachment protrusion ribs formed on the inner wall of the tunnel cylinder, and a cut slit is provided in a state where a part is continuous in the entire area of the adhesive layer. The collision sound generating device consists of a balance bait rod provided near the upper central part of the tunnel body, having a balance release hook at its upper end, a spool at its middle section, and a bait-hanging section at its lower end, and an elastic body connecting a weight that is hooked onto a part of the tunnel body and the balance release hook. Adopt means.

[0018] Also, the present invention of The mouse trap adopts a means of providing a monndori trap formed by a flange-like return at the peripheries of the entrance and exit provided in front of and behind the tunnel cylinder.

[0019] Also, the present invention of The mouse trap forms flange portions for stabilizing the installation state at both lower left and right ends of the tunnel cylinder, and adopts a means of providing detachable installation fixing means on the flange portions.

Effects of the Invention

[0020] According to the mouse trap in the present invention, since the tunnel cylinder is formed in a tunnel shape that opens the floor surface, it is possible to guide the mouse trap in the same state as the floor surface through which the captured mouse has passed, so that mice with excellent vision, smell, touch, hearing, and taste are not alerted, and the mouse can be captured with a higher probability than before, thus achieving excellent effects such as this.

[0021] Also, according to the mouse trap in the present invention, since it is a mouse trap composed of a tunnel cylinder that opens the floor surface, an adhesive capture sheet provided with a cut slit, and a collision sound generating device, it is lightweight and easy to carry, can be easily installed, and further has a low manufacturing cost, so it can be repeatedly used for household and business purposes, thus achieving excellent effects such as this.

[0022] Also, according to the mouse trap in the present invention, since a mandori trap formed by a flange-like return is provided at the periphery of the entrance and exit provided in the front and rear of the tunnel cylinder, it is possible to facilitate the intrusion of the captured mouse and make it difficult for the mouse to escape, thus achieving excellent effects such as this.

[0023] Also, according to the mouse trap in the present invention, since it adopts a means by which the captured mouse is entangled by the adhesive capture sheet as a whole, it is possible to dispose of it as household waste without directly visualizing the dead body of the mouse, thus achieving excellent effects such as this.

[0024] Also, according to the mouse trap in the present invention, since it can be arranged according to the location and situation where mice are likely to appear by the installation fixing means, it is possible to capture mice with a higher probability than before, thus achieving excellent effects such as this.

Brief Description of the Drawings

[0025] [Figure 1] It is an explanatory diagram showing an embodiment of the mouse trap in the present invention. (Example 1) [Figure 2]This is an explanatory diagram showing the capture state of the mouse trap according to the present invention. [Figure 3] This is an explanatory diagram showing another embodiment of the rat trap according to the present invention. (Example 2) [Figure 4] This is an explanatory diagram showing another embodiment of the rat trap according to the present invention. (Example 3) [Modes for carrying out the invention]

[0026] The present invention's rat trap 10 consists of a tunnel-shaped tube 20 for guiding rats R, an adhesive trapping sheet 29 for trapping rats R by adhesion, and a collision sound generating device 35 for startling rats R. Its most distinctive feature is that it removes the conventional adhesive trapping sheet 29 laid on the bottom to reduce the rats' wariness, and when a part of the rat's body comes into contact with the collision sound generating device 35, a collision sound is generated to startle the rats R, and the adhesive trapping sheet 29 attached to the inner wall traps the rats R that enter. Hereinafter, embodiments of the rat trap 10 according to the present invention will be described with reference to the drawings.

[0027] Furthermore, the material, shape, and dimensions of the rat trap 10 in this invention are not limited to the embodiments described below, and can be appropriately modified within the scope of the technical concept of this invention, that is, within the range of materials, shapes, and dimensions that can achieve the same effects. [Examples]

[0028] . Figure 1 is an explanatory diagram showing an embodiment of the rat trap according to the present invention. Figure 1(a) is an overall perspective view of the mouse trap 10. Figure 1(b) is an exploded perspective view of the mouse trap 10. Figure 1(c) is a cross-sectional diagram of the rat trap 10. The rat trap 10 of the present invention consists of a tunnel-shaped body 20, an adhesive trapping sheet 29, and a collision sound generating device 35.

[0029] The tunnel-shaped cylinder 20 is formed by creating a tunnel-shaped cylinder with an open floor of the required length. In terms of materials, disposable materials such as thick cardboard, pulp molded material, and biodegradable material are used, as well as reusable materials such as synthetic resin material and metal plate, to form a tunnel-shaped cylinder with the required length to allow a mouse to fit completely inside. In addition, adhesive projection ribs 24 are formed on the inner wall, to which the adhesive trap sheet 29 can be attached in a way that allows it to be easily peeled off.

[0030] The entrance section 21 and the exit section 22 are provided at the front and rear of the tunnel body 20, respectively, and are formed to be approximately twice the size of the mouse R.

[0031] The adhesive projection rib 24 is a convex projection formed on the inner wall of the tunnel body 20, and is provided for the purpose of attaching the easily peelable adhesive layer 31 of the adhesive trap sheet 29. By making it a convex projection, the area on which the easily peelable adhesive layer 31 is attached is reduced, which makes it easier for the easily peelable adhesive layer 31 of the adhesive trap sheet 29 to peel off easily from the inner wall of the tunnel body 20 when a mouse R adheres to the adhesive layer 32 of the adhesive trap sheet 29.

[0032] The adhesive trapping sheet 29 is formed by laminating an adhesive layer release film 30, an easily peelable adhesive layer 31, an adhesive layer 32, and an adhesive layer release film 33. The easily peelable adhesive layer 31 is attached to the adhesive projection rib 24 formed on the inner wall of the tunnel cylinder 20, and the entire area of ​​the adhesive layer 32 is provided with a cut slit 34 that is divided when a mouse R is captured.

[0033] The slits 34 divide a portion of the adhesive layer 32 in a continuous manner, forming a shape in which the adhesive layer 32 of the adhesive trap sheet 29 adheres to the captured mouse R and becomes entangled with a part of the mouse R's body.

[0034] The collision sound generating device 35 is provided near the upper central part of the tunnel body 20 and is formed to generate a collision sound when a part of the mouse R's body comes into contact with it. For example, a balance release hook portion 37 is provided at the upper end of the balance hanging bait rod 36, a spool portion 38 is provided below it that is locked into a communication hole 26 provided in the tunnel body 20, and a hanging bait hook 39 is further connected to the spool portion 38. The device is formed to generate a collision sound when a part of the mouse R's body comes into contact with the tunnel body 20 or the balance hanging bait rod 36, causing the elastic body 40 (rubber band) to which the weight 41 is connected to detach and collide with the floor surface F or the tunnel body 20. Furthermore, weight 41 can also be formed from a sound-making object with a certain weight that produces a wind-cutting sound, such as a bell or whistle.

[0035] Furthermore, the collision sound generating device 35 does not particularly specify its structure or means, as long as it generates a collision sound when a part of the mouse R's body comes into contact with the tunnel tube 20 or the balance suspension bait rod 36.

[0036] Figure 1(d) is a partially enlarged perspective view showing the configuration of the adhesive trapping sheet 29 of the mouse trap 10. Figure 1(e) is a partially enlarged cross-sectional view showing the configuration of the adhesive trapping sheet 29 of the mouse trap 10. The adhesive trapping sheet 29 is formed by laminating an adhesive layer release film 30, an easily peelable adhesive layer 31, an adhesive layer 32, and an adhesive layer release film 33. The easily peelable adhesive layer 31 is attached to the adhesive projection rib 24 formed on the inner wall of the tunnel body 20, and the entire area of ​​the adhesive layer 32 is provided with cut slits 34 that are divided while partially connected.

[0037] Unlike conventional methods that lure mice R into the trap and capture them with an adhesive trapping sheet 29 laid on the floor F, the mouse trap 10 of the present invention, composed of the above, guides mice R into the tunnel tube 20 by making the structure of the bottom surface inside the tunnel tube 20 the same as the floor F from which the mice R have passed. When a part of the body of the entering mouse R comes into contact with the adhesive trapping sheet 29 or the collision sound generating device 35, the mouse R is stuck to the adhesive trapping sheet 29 attached to the inner wall surface of the tunnel tube 20 and entangled. Its attraction structure and capture method are significantly different from conventional mouse traps that lay an adhesive trapping sheet 29 on the bottom surface.

[0038] Figure 2 is an explanatory diagram showing the capture state of the mouse trap according to the present invention. Figure 2(a) is a cross-sectional diagram illustrating the state in which the rat trap 10 according to the present invention is set up. (1) Peel off the adhesive release film 30 covering the easily peelable adhesive layer 31 of the adhesive trapping sheet 29 and attach it to the adhesive projection rib 24 on the inner wall of the tunnel body 20. (2) With the easily removable adhesive layer 31 of the adhesive trapping sheet 29 attached to the inner wall of the tunnel body 20, the adhesive layer release film 33 is peeled off. (3) Attach the bait E to the balance hanging bait rod 36 of the collision sound generating device 35 and set the mouse trap 10 in the designated place.

[0039] Figure 2(b) is an explanatory diagram showing the state in which a mouse R is captured when it comes into contact with a part of the tunnel body 20. When a mouse R approaches the entrance 21 of the tunnel body 20 and touches a part of the tunnel body 20, the impact activates the collision sound generator 35, startling the mouse R and causing it to jump up. As a result, a part of the mouse R's body becomes entangled in the adhesive trap sheet 29, and it is captured. When the collision sound generator 35 is activated, the rat R is startled by the collision sound and tries to escape by rapidly changing its posture, causing a part of the rat R's body to come into contact with the adhesive trapping sheet 29 attached to the inner wall of the tunnel tube 20, and is captured in an entangled state.

[0040] Furthermore, when a mouse R enters the tunnel body 20 and touches the adhesive layer 32 attached to the inner wall of the tunnel body 20, the collision sound generating device 35 is activated, startling the mouse R and causing it to jump up. As a result, part of the mouse R's body comes into contact with the adhesive trapping sheet 29, causing it to become entangled and captured.

[0041] Figure 2(c) is an explanatory diagram showing the state in which a mouse R is captured when it comes into contact with the bait E or the balanced hanging bait stick 36. If the mouse R goes further into the tunnel body 20, it will either come into contact with the bait E, or, without showing any interest in the bait E, it will come into contact with the balance suspension bait rod 36, causing the elastic body 40 (rubber band) to detach from the balance release hook portion 37 of the balance suspension bait rod 36. This will cause the weight 41 connected to the elastic body 40 to strike the entrance portion 21 of the tunnel body 20 or the floor surface F, startling the mouse R, which will thrash around inside the tunnel body 20, causing it to come into contact with the adhesive trap sheet 29 and become entangled, thus being captured.

[0042] Figure 2(d) is an explanatory diagram showing the state in which the mouse R is captured. The more the mouse R struggles and thrashes, the more the sticky trapping sheets 29 entangle and trap the mouse R, and then the sticky trapping sheets 29 surrounding the mouse R are disposed of as food waste.

[0043] The rat trap 10 of the present invention, as described above, has a structure in which an adhesive trapping sheet 29 is not provided on the bottom surface of the tunnel-shaped body 20 with an open floor. Therefore, it can easily trap rats R, which are sensitive to sight, smell, touch, hearing, and taste, by guiding them into the tunnel-shaped body 20 without arousing suspicion, thereby enabling a higher probability of trapping rats R than with conventional traps. [Examples]

[0044] Figure 3 is an explanatory diagram showing another embodiment of the rat trap according to the present invention. Figure 3(a) is an overall perspective view of the mouse trap 10. Figure 3(b) is an exploded perspective view of the mouse trap 10. Figure 3(c) is a cross-sectional diagram of the rat trap 10. The rat trap 10 in this invention employs a method in which a trap 23, formed by a flange-shaped barb, is provided on the periphery of the entrance portion 21 and exit portion 22, which are located at the front and rear of the tunnel-shaped cylindrical body 20.

[0045] The trap 23 is provided on the periphery of the entrance 21 and exit 22 located at the front and rear of the tunnel body 20, respectively. It is a trap that forms a trap-like structure by creating a flange-shaped barb that extends from the outside to the inside, making it easy for the captured mouse R to enter and difficult for it to escape.

[0046] Figure 3(d) is an explanatory diagram showing the state in which the mouse R is captured. The more the mouse R struggles and thrashes, the more the sticky trapping sheets 29 entangle and trap the mouse R, and then the sticky trapping sheets 29 surrounding the mouse R are disposed of as food waste.

[0047] The rat trap 10 of the present invention, as described above, has a structure in which an adhesive trapping sheet 29 is not provided on the bottom surface of the tunnel body 20 with an open floor. Therefore, it can easily lure rats R, which are sensitive to sight, smell, touch, hearing, and taste, into the tunnel body 20 without arousing suspicion and capture them. Furthermore, since trapping traps 23 formed by flange-shaped fins are provided around the periphery of the entrance 21 and exit 22 provided at the front and rear of the tunnel body 20, rats R can be captured with a higher probability than conventional traps. [Examples]

[0048] Figure 4 is an explanatory diagram showing another embodiment of the rat trap according to the present invention. The rat trap 10 in the present invention employs a method in which flange portions 27 are formed at both the left and right lower ends of the tunnel-shaped cylindrical body 20 to stabilize the installed state, and a detachable installation and fixing means 42 is provided on the flange portions 27.

[0049] The flange portion 27 is formed by a flange-shaped flat surface provided at both the left and right lower ends of the tunnel body 20 to stabilize its installation.

[0050] The installation and fixing means 42 provides a means for stably installing the tunnel body 20 on the floor surface F, according to the material and inclination of the floor surface F. In the case of disposable materials such as cardboard, pulp molded material, and biodegradable material, double-sided tape or thumbtacks are used, while in the case of reusable materials such as synthetic resin material and metal plate, magnetic sheets, clips, suction cups, etc. are used.

[0051] Figure 4(a) is an explanatory diagram showing the state of use of the mouse trap 10. This shows the rat trap 10 being installed using double-sided tape 43. This is used when installing the rat trap 10 in a dry location.

[0052] Figure 4(b) is an explanatory diagram showing another usage scenario of the rat trap 10. This shows the rat trap 10 being installed using thumbtacks 44. This is used when the rat trap 10 is made of a soft material such as cardboard, pulp molded material, or biodegradable material.

[0053] Figure 4(c) is an explanatory diagram showing another usage scenario of the rat trap 10. This shows the mouse trap 10 being installed using a clip-type magnetic sheet 45. This method is used when the rat trap 10 is made of a hard material such as synthetic resin or metal plate, and the installation location is made of a metal plate such as stainless steel.

[0054] The present invention, comprising the above configuration, aims to provide a rat trap 10 that can be stably installed according to the conditions of various installation locations. [Industrial applicability]

[0055] Although the rat trap of the present invention was developed as a trapping device for the purpose of exterminating rats, it can be widely used as a trapping device for wild pests that are sensitive to sight, smell, touch, hearing, and taste. Therefore, the industrial applicability of the "rat trap" of the present invention is considered to be great. [Explanation of Symbols]

[0056] 10 Mouse traps 20 Tunnel Body 21 Entrance 22 Exit section 23. A trap 24 Adhesive protruding ribs 25 Elastic hook part 26 Communication hole 27 Flange section 28 Floor fixing means 29 Adhesive trap sheets 30. Easily removable adhesive layer 31. Adhesive layer release film 32 Adhesive layer 33. Adhesive release film 34 Slits 35. Collision sound generator 36 Balanced Hanging Baiting Rod 37 Balance release hook section 38th panel 39 Hanging bait hook 40 Elastic material (rubber band) 41 weights 42 Installation and fixing means 43 Double-sided tape 44 thumbtacks 45 Magnetic Sheets R Mouse F Floor E Feed

Claims

1. A mouse trap comprising a tunnel-shaped body, an adhesive trapping sheet, and a collision sound generating device, The aforementioned tunnel body consists of a tunnel-shaped cylindrical body having a required length with an open floor and entrances formed at the front and rear. The adhesive trapping sheet is constructed by laminating an adhesive layer release film, an easily peelable adhesive layer, an adhesive layer, and an adhesive layer release film, with the easily peelable adhesive layer being attached to the adhesive projection ribs formed on the inner wall of the tunnel body, and the entire area of ​​the adhesive layer is provided with cut slits that divide it while partially connected. The rat trap is characterized by comprising a collision sound generating device, a balance bait rod provided near the upper central part of the tunnel body, having a balance release hook at its upper end, a spinner section in the middle, and a bait hanging section at its lower end, and an elastic body connecting a weight that is hooked onto a part of the tunnel body and the balance release hook.

2. The rat trap according to claim 1, characterized in that a trap is provided on the periphery of the entrance and exit portions provided at the front and rear of the tunnel body, which are formed by flange-shaped flaps.

3. The rat trap according to claim 1 or 2, characterized in that flange portions are formed at both the left and right lower ends of the tunnel body to stabilize its installation state, and a detachable installation and fixing means is provided on the flange portions.

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