JP5588328B2 - Lid fixing structure and lid fixing method - Google Patents

Description

  The present invention relates to a lid fixing structure using an opening member provided with an opening and a plurality of opening lids covering the opening. Moreover, it is related with the fixing method of the lid | cover which fixes the opening part cover plate to an opening member using this fixing structure of a lid | cover.

  The side groove provided on the side of the road or the like is generally in the form in which the upper surface of the side groove body having a U-shaped cross section is closed with a lid, or in the form in which the opening of the gate-shaped side groove body is closed with a lid. Yes. In this type of gutter, a thick and heavy concrete plate is used for many of the lids. For this reason, when installing a new gutter, refurbishing an old gutter, or performing maintenance on a gutter, the heavy lid must be lifted, placing a heavy burden on the operator's body. It was strong. Therefore, the entire lid is reduced in weight as a grating plate. However, when the weight of the lid is reduced, another problem arises that the lid easily rises when an automobile or the like passes over the lid. For this reason, when using a grating plate as a lid, the lid is usually fixed to the side groove body using a fixing means such as a bolt. However, the grating plate has a drawback that it is more expensive than the concrete plate.

  In view of such a situation, so far, an opening plate made of a concrete slab having an opening in the center, a concrete plate covering a specific section in the opening, and the specific section in the opening There has also been proposed a side groove in which the top plate is composed of a grating plate that covers other adjacent sections (for example, Patent Document 1). In Patent Document 1, by adopting the above configuration, a notch used as a clue when lifting the top plate is unnecessary or small, and is excellent in safety and economical even though drainage efficiency is high. It is also described that it can be.

  However, in the lateral groove of Patent Document 1, the grating plate (the part indicated by reference numeral 35 in FIGS. 1 to 8 of the same document) is a support rod for locking (the part indicated by reference numeral 29 in FIGS. 8 to 10 of the same document). The concrete plate is not directly fixed to the opening plate, although it is fastened to the opening plate by hooking a hook (portion indicated by reference numeral 51 in FIG. 8 of the same document) to the opening plate. For this reason, when an automobile or the like passes over the top board, the concrete plate rattles and noise and vibration are generated. This is because, even if the jumping up can be prevented by using a heavy concrete plate, the rattling cannot be prevented. In order to prevent the rattling of the concrete plate, not only the grating plate but also the concrete plate is fastened with the locking support rod and hook described above, the manufacturing cost of the top plate becomes high. In particular, when reducing the size and weight of concrete plates and grating plates that cover the openings of opening members to save labor when constructing, refurbishing, and maintaining gutters, concrete plates and grating plates are conventionally used. Since the number of sheets to be installed increases, the labor for fixing the concrete plate or the grating plate to the opening plate also increases, and there is a possibility that the workability may be deteriorated.

JP 2001-003440 A

  The present invention has been made in order to solve the above-described problem, and is a lid fixing structure in which a plurality of opening lid plates are fitted and fixed in openings provided in an opening member, and all the openings are provided. The lid plate for the section is firmly fixed to the opening member, and there is no risk that the lid plate for the opening section rattles or jumps up, and it is troublesome to fix the lid plate for the opening section to the opening member. Therefore, it is possible to provide a cover (opening cover plate) fixing structure that can be suitably employed when constructing various concrete structures as inexpensively as possible. It is also an object of the present invention to provide a method for fixing a lid (opening portion cover plate) that fixes the opening portion cover plate to the opening member by using this lid fixing structure.

  The above-described problem is for an opening member that covers an opening member provided with an opening, an opening cover plate A that covers a specific section in the opening, and another section adjacent to the specific section in the opening. A lid fixing structure using the lid B, and after the opening lid A is fitted in the specific section in the opening, the opening lid in the other section in the opening The opening cover plate A is fixed to the opening member by fixing the opening member and the opening cover plate B in a state where the opening cover plate B is pressed downward with respect to the opening member. This is solved by providing a fixing structure for the lid, which is characterized in that it is held in a state of being held. Although the use of the lid fixing structure of the present invention is not limited, it can be suitably used for concrete structures such as side grooves and water channels that need to be closed with a lid. This is because this type of concrete structure is heavy, and therefore there is a strong demand for improving workability. Examples of the side groove include a general side groove having a U-shaped cross section, and a free-gradient side groove having a reverse U-shaped cross section (a side groove having a gate-shaped side groove body having an opening at the top). Moreover, it is employable also for the fixing structure of the lid | cover used in order to block the opening part provided in box culvert, a slab, etc.

In the lid fixing structure of the present invention, the opening cover plate A is fixed by fixing the opening member and the opening cover plate B in a state where the opening cover plate B is pressed downward against the opening member. There is no particular limitation on the specific configuration for making the state held by the opening member. However, it is preferable to adopt the following configuration. That is, among the surfaces constituting the outer peripheral surface of the opening portion cover plate A, a pair of surfaces α ₁ and α ₂ facing opposite to each other are formed so as to be inclined downward, and the opening portion cover plate is formed. Of the surfaces constituting the outer peripheral surface of B, a surface β ₁ that contacts the surface α ₁ of the opening lid plate A is formed with an inclination opposite to the surface α _1, and each of the openings forming the opening member is formed. Of the inner peripheral surface, a surface γ ₁ that is in contact with the surface α ₂ of the opening cover plate A is formed with an inclination opposite to the surface α _2, and the opening cover plate A is formed in the specific section of the opening. After the fitting, the opening cover plate B is fitted into the other section in the opening, and the opening cover plate and the opening cover plate are pressed down against the opening member. by fixing the B, and surface alpha ₁ of the opening lid plate a is pressed in terms beta ₁ of the lid plate B for opening, the surface of the lid plate B opening beta ₁ It is preferable that the opening lid A is held in a wedge shape with respect to the opening member between the opening γ ₁ and the surface γ ₁ of the opening. Thereby, unless the fixation of the opening part cover B with respect to an opening member is removed, it can be set as the structure which cannot remove the opening part cover plate A from an opening member.

In the lid fixing structure of the present invention, it is also preferable to attach a rubber sheet to the surface α _{1 of the} opening lid plate A or the surface β ₁ of the opening lid plate B. This makes it possible to prevent the opening portion cover plate A from rattling with respect to the opening portion cover plate B. Therefore, not only the noise and vibration generated when an automobile or the like passes above the opening cover plate A or the opening cover plate B, but also the opening cover plate A and the opening cover plate B. Can be prevented, and the durability of the opening cover plate A and the opening cover plate B can be improved. For the same reason, it is also preferable to paste the rubber sheet on the surface gamma ₁ surface alpha ₂ or the opening of the lid plate A opening. As a result, it is possible to prevent rattling of the opening cover plate A with respect to the opening member. Furthermore, in the lid fixing structure of the present invention, the means for fixing the opening portion cover plate B in a state where it is pressed downward with respect to the opening member is not particularly limited, but usually a bolt is used.

Furthermore, in the lid fixing structure of the present invention, the opening covered with the opening cover plate A and the opening cover plate B may be provided only at one location with respect to one opening member. You may provide in a location. It is determined appropriately according to the size and shape of the opening member. Further, the opening lid plate A and the opening lid plate B may be fitted only one by one into one opening portion, but the opening lid plate A and the opening portion may be inserted into one opening portion. A plurality of the part cover plates B may be fitted. For example, the case where both ends of the opening are covered with a pair (two sheets) of the opening cover plate A and the central part of the opening is covered with one opening cover plate B, and the like. By adopting such a configuration, after the opening cover plate A is fitted into both ends of the opening, the opening cover plate B is fitted into the center of the opening, and the opening cover plate When B is fixed in a state where it is pressed downward with respect to the opening member, the pair of opening cover plates A are pushed outward (directions toward both ends of the opening) by the opening cover plate B, respectively. It can be made to be held in a wedge shape between the surface β ₁ of the opening lid plate B and the surface γ _{1 of the} opening.

  By the way, in the lid fixing structure of the present invention, the material forming the opening member, the opening lid plate A, and the opening lid plate B varies depending on the use of the lid fixing structure and is not particularly limited. However, it is preferable that at least one of the opening cover plate A and the opening cover plate B is formed of concrete. Since the opening cover plate made of concrete is heavy, when the opening cover plate is reduced in size and weight to save labor, the cover fixing structure according to the present invention is used for workability. It is because there is a meaning to improve. When at least one of the opening cover plate A and the opening cover plate B is made of concrete, the opening member for fixing it is usually made of concrete in consideration of strength and the like. When the lid fixing structure of the present invention is used for a top plate for a side groove, the opening member and the opening cover plate A are made of concrete, and the opening cover plate B is formed by grating. It is preferable. As a result, the composite structure using the lid fixing structure of the present invention (such as a top plate for a side groove) has the advantage of concrete that it is difficult to jump up and is inexpensive, and the advantage of grating that it is easy to handle and easy to install. Can be combined.

  As described above, according to the present invention, there is provided a lid fixing structure in which a plurality of opening lid plates are fitted and fixed in the opening portions provided in the opening member, and all the opening lid plates are attached to the opening members. Various concrete structures that are firmly fixed to the cover, have no risk of rattling or splashing of the opening cover plate, and can reduce the trouble of fixing the cover to the opening member. It is possible to provide a lid fixing structure that can be suitably employed even when constructing the housing as inexpensively as possible. It is also possible to provide a lid fixing method for fixing the opening cover plate to the opening member using this fixing structure.

In the gutter top plate using the lid fixing structure of the present invention, the opening in the opening plate (opening member) is divided into a concrete plate (opening cover plate A) and a grating plate (opening cover plate B). It is the perspective view which showed the state before covering. In the top plate for a side groove using the lid fixing structure of the present invention, a perspective view showing a state after covering both ends of the opening in the opening plate (opening member) with a concrete plate (opening cover plate A). FIG. FIG. 2 shows a state after covering both ends of the opening in the opening plate (opening member) with a concrete plate (opening cover plate A) in the side groove top plate using the lid fixing structure of the present invention. is a cross-sectional view taken along a x ₁ -x ₁ side. In the top plate for a side groove using the lid fixing structure of the present invention, the opening in the opening plate (opening member) is made of a concrete plate (opening cover plate A) and a grating plate (opening cover plate B). It is the perspective view which showed the state after covering. In the top plate for a side groove using the lid fixing structure of the present invention, the opening in the opening plate (opening member) is made of a concrete plate (opening cover plate A) and a grating plate (opening cover plate B). FIG. 5 is a cross-sectional view of the state after covering, cut along the x ₁ -x ₁ plane of FIG. It is a top view of the opening plate (opening member) which comprises the top plate for side grooves using the fixing structure of the lid | cover of this invention. Opening plate constituting the top plate for gutters using fixing structure of the cover of the present invention (opening member) is a sectional view taken along a x ₁ -x ₁ side in FIG. 6. Opening plate constituting the top plate for gutters using fixing structure of the cover of the present invention (opening member) is a sectional view taken along a y ₁ -y ₁ side in FIG. 6. It is a top view of the concrete plate (cover plate A for opening part) which comprises the top plate for a side groove using the fixing structure of the lid | cover of this invention. It is a side view of the concrete plate (opening plate A for openings) constituting the top plate for the side groove using the lid fixing structure of the present invention. It is a front view of the concrete plate (opening cover plate A) constituting the top plate for the side groove using the lid fixing structure of the present invention. It is a top view of the grating plate (opening plate B for opening) which constitutes the top plate for the side groove using the lid fixing structure of the present invention. It is a side view of the grating plate (opening plate B for opening) which constitutes the top plate for the side groove using the lid fixing structure of the present invention. It is a front view of the grating plate (opening plate B for opening) which constitutes the top plate for the side groove using the lid fixing structure of the present invention.

1. Outline of Lid Fixing Structure A preferred embodiment of the lid fixing structure of the present invention will be described more specifically with reference to the drawings. In the following, the lid fixing structure of the present invention will be described by taking, as an example, a top plate for a side groove composed of an opening plate provided with an opening, and a concrete plate and a grating plate covering a predetermined portion in the opening. Will be explained. In the following description, “opening plate” corresponds to “opening member” described above, “concrete plate” corresponds to “opening cover plate A” described above, and “grating plate” includes “ Corresponding to the “opening cover plate B”. That is, the “lid” in the “lid fixing structure” of the present embodiment does not indicate “top plate” or “opening plate”, but “opening plate A” and “opening plate B”. Note that FIG. 1 is a perspective view showing the top plate 100 before the opening 11 is covered with the concrete plate 120 and the grating plate 130. FIG. 2 is a perspective view showing the top plate 100 after the both ends of the opening 11 are covered with the concrete plate 120. FIG. 3 is a cross-sectional view of the top plate 100 taken along the x ₁ -x ₁ plane of FIG. 2 after covering both ends of the opening 11 with the concrete plate 120. FIG. 4 is a perspective view showing the top plate 100 after the opening 11 is covered with the concrete plate 120 and the grating plate 130. Figure 5 is a cross-sectional view of the top plate 100 with _x 1 -x ₁ side of FIG. 4 the opening 11 after covered with concrete plate 120 and grating plate 130.

  As shown in FIG. 1, the top plate 100 of this embodiment includes an opening plate 110 provided with an opening 111 for maintenance, a pair of concrete plates 120 covering both ends of the opening 111, and an opening 111. It consists of a grating plate 130 covering the center. As shown in FIGS. 2 and 3, the top plate 100 has a concrete plate 120 fitted into both ends of the opening portion 111 of the opening plate 110, respectively, and then, as shown in FIGS. The concrete plate 120 is held with respect to the opening plate 110 by fixing the opening plate 110 and the grating plate 130 in a state where the grating plate 130 is fitted into the portion and the grating plate 130 is pressed downward with respect to the opening plate 110. It becomes what has been done. In the top plate 100, water guide grooves and water guide holes for guiding water flowing on the top surface of the top plate 100 to the back side of the top plate 100 are provided in a slit shape along the longitudinal center line of the top plate 100.

2. Opening plate As shown in FIGS. 6 to 8, the opening plate 110 is a thick plate having a substantially rectangular shape in plan view, and is a frame having an opening 111 at the center thereof. FIG. 6 is a plan view of the aperture plate 110. 7 is a cross-sectional view of the aperture plate 110 taken along the x ₁ -x ₁ plane in FIG. FIG. 8 is a cross-sectional view of the aperture plate 110 taken along the plane y ₁ -y ₁ in FIG. The material of the opening plate 110 is not particularly limited as long as the necessary strength can be exhibited. However, in consideration of easiness of molding and cost, it is usually made of concrete. In the top plate 100 of this embodiment, a thick plate-like concrete slab provided with reinforcing bars is used as the opening plate 110.

  As shown in FIG. 6, the opening 11 has a substantially rectangular shape in plan view provided along the longitudinal direction of the opening plate 110. As shown in FIG. 6, a first step portion 111a and a second step portion 111b are formed on a pair of side edges along the longitudinal direction of the opening portion 111. As shown in FIG. 5, the first step portion 111 a is a portion on which the side edge of the concrete plate 120 is placed, and is formed at both end portions of the side edge of the opening 111. On the other hand, as shown in FIG. 5, the second step portion 111 b is a portion on which the side edge of the grating plate 130 is placed, and is formed at the central portion of the side edge of the opening 111. As described above, by providing the first step portion 111a and the second step portion 111b, the top plate 100 can be more easily constructed such that the positioning of the concrete plate 120 and the grating plate 130 is facilitated. ing.

  The height at which the first step portion 111a and the second step portion 111b are provided is not particularly limited. Usually, when the concrete plate 120 and the grating plate 130 are placed on them, the upper surfaces of the concrete plate 120 and the grating plate 130 are opened. The height is set to be flush with the upper surface of the plate 110. Thereby, the upper surface of the top plate 100 after construction can be formed flat. As shown in FIG. 5, in the top plate 100 of the present embodiment, the concrete plate 120 is formed thicker than the grating plate 130, so the first step portion 111a (low step portion) is the second step portion. It is set lower than the portion 111b (high step portion). Bolt holes for fixing bolts 140 (see FIG. 4) for fixing the grating plate 130 to the opening plate 110 are provided on the upper surface of the second step portion 111b on which the side edge of the grating plate 130 is placed.

Of the inner peripheral surface forming the opening 111 in the aperture plate 110, inverse gradient pair of faces gamma ₁ facing the longitudinal opening plate 110, as shown in FIG. 7, in which reverse tilt (steep than the vertical In the state). As shown in FIG. 5, the surface α ₂ of the concrete plate 120 comes into surface contact with the surface γ ₁ when the opening 111 is closed with the concrete plate 120 and the grating plate 130. For this reason, the reverse inclination angle θ ₄ (see FIG. 7) of the surface γ ₁ coincides with the inclination angle θ ₂ of the surface α ₂ . Here, “tilt angle θ ₂ ” and “reverse tilt angle θ ₄ ” mean angles based on the vertical plane (vertical plane). The same applies to the inclination angle θ ₂ and the reverse inclination angle θ ₄ described later.

3. Concrete plate (lid plate A for opening)
As shown in FIGS. 9 to 11, the concrete plate 120 is a thick plate having a substantially rectangular shape in plan view. FIG. 9 is a plan view of the concrete plate 120. FIG. 10 is a side view of the concrete plate 120. FIG. 11 is a front view of the concrete plate 120. The material of the concrete plate 120 (opening cover plate A) is not particularly limited as long as it can exhibit the required strength, but is usually made of concrete in consideration of ease of molding and cost. In the top plate 100 of the present embodiment, a thick plate-like concrete slab provided with reinforcing bars is used as the concrete plate 120.

Of the surfaces constituting the outer peripheral surface of the concrete plate 120, a pair of surfaces α ₁ and α ₂ facing opposite sides in the longitudinal direction of the top plate 100 are spread downward as shown in FIG. And the upper edge side is inwardly recessed). In the top plate 100 of the present embodiment, one of the upper side surface of the concrete 120 has a surface alpha _1, the tip of the protrusion 121 provided in the horizontal direction from the other side the upper part of the side opposite to the side surface of the one It has a surface α _2. As shown in FIG. 5, the surface β ₁ of the grating plate 120 is in surface contact with the surface α ₁ of the concrete plate 120 when the opening 111 is closed with the concrete plate 120 and the grating plate 130. . Therefore, the inclination angle theta ₁ plane alpha _{1 (see} FIG. 10) is adapted to match the reverse slope angle theta ₃ faces beta _{1 (see} Figure 13). The inclination angle theta ₁ surface alpha ₁ may be different from the inclination angle theta ₂ of surface alpha _2, but usually is equal. In the top plate 100 of the present embodiment, the inclination angle θ ₁ , the inclination angle θ ₂ , the reverse inclination angle θ _3, and the reverse inclination angle θ ₄ are all set to the same value.

Specifically, the inclination angle θ ₁ (see FIG. 10), the inclination angle θ ₂ (see FIG. 10), the reverse inclination angle θ ₃ (see FIG. 13), the reverse inclination angle θ ₄ (see FIG. 13). The degree to which (see) is set is not particularly limited. However, if the inclination angles θ ₁ , θ ₂ and the reverse inclination angles θ ₃ , θ ₄ are too small, the surfaces α ₁ , α ₂ , β ₁ , γ ₁ become close to vertical (vertical), and the concrete plate 120 becomes There is a possibility that it is difficult to be held in a wedge shape between the surface β ₁ of the grating plate 130 and the surface γ ₁ of the aperture plate 110. For this reason, the inclination angles θ ₁ and θ ₂ and the reverse inclination angles θ ₃ and θ ₄ are normally set to 1 ° or more. The inclination angles θ ₁ and θ ₂ and the reverse inclination angles θ ₃ and θ ₄ are preferably 2 ° or more, and more preferably 3 ° or more.

On the other hand, if the inclination angles θ ₁ and θ ₂ and the reverse inclination angles θ ₃ and θ ₄ are too large, the edges of the concrete plate 120, the grating plate 130, and the opening plate 110 become sharp, and the concrete plate 120, the grating plate 130, and the opening The plate 110 may be easily damaged. For this reason, the inclination angles θ ₁ and θ ₂ and the reverse inclination angles θ ₃ and θ ₄ are normally set to 45 ° or less. The tilt angles θ ₁ and θ ₂ and the reverse tilt angles θ ₃ and θ ₄ are preferably 30 ° or less, more preferably 15 ° or less, and even more preferably 10 ° or less. In the top plate 100 of this embodiment, the inclination angles θ ₁ and θ ₂ and the reverse inclination angles θ ₃ and θ ₄ are both about 4 °.

4). Grating plate (opening cover plate B)
The grating plate 130 is a thick plate having a substantially rectangular shape in plan view, as shown in FIGS. FIG. 12 is a plan view of the grating plate 130. FIG. 13 is a side view of the grating plate 130. FIG. 14 is a front view of the grating plate 130. The material of the grating plate 130 (opening lid plate B) is not particularly limited as long as the required strength can be exhibited. In the top plate 100 of this embodiment, a metal plate in which steel materials are assembled in a lattice shape is used as the grating plate 130. Of the surfaces constituting the outer peripheral surface of the grating plate 130, the surface beta ₁ in contact with the surface alpha ₁ of the concrete 120, as already stated, the surface alpha ₁ are formed by reverse tilt.

5. Next, the concrete plate 120 (opening plate A) and the grating plate 130 (opening plate B) are fixed to the opening plate 110 using the above-described lid fixing structure of the present invention. A preferred embodiment of the method for fixing the lid will be specifically described.

First, as shown in FIGS. 2 and 3, a pair of concrete plates 120 are fitted into both ends in the longitudinal direction of the opening 111 of the opening plate 110. Each concrete plate 120 is arranged so that the side edges on both sides thereof are placed on the low step portion 111 a in the opening plate 110. The surface γ ₁ of the opening plate 110 has a reverse inclination, and the surface α ₂ of the concrete plate 120 is in surface contact with the surface γ ₁ of the opening plate 110 from directly above both longitudinal ends of the opening 111. The concrete plate 120 cannot be fitted in such a way. For this reason, the concrete plate 120 is fitted in a place slightly closer to the center than the both ends in the longitudinal direction of the opening 111, and then pushed toward both ends in the longitudinal direction of the opening 111. At this time, the surface α ₂ of the concrete plate 120 may still be separated from the surface γ ₁ of the opening plate 110, but if the gap between the surface α ₂ and the surface γ ₁ is large, the pair of concrete plates 120. There is a possibility that the gap between the pair of concrete plates 120 becomes narrow and it is difficult to fit the grating plate 130 into the gap between the pair of concrete plates 120. Therefore, it is preferable that the surface α ₂ of the concrete plate 120 is in light contact with the surface γ ₁ of the opening plate 110.

Next, as shown in FIGS. 4 and 5, the grating plate 130 is fitted into the central portion in the longitudinal direction of the opening 111 of the opening plate 110. Grating plate 130 fitted with its surface beta ₁ into contact with the surface alpha ₁ of the concrete 120. Surface alpha ₁ of the concrete panel 120 is inclined down spread, surface beta ₁ of the grating plate 130 has a reverse slope. Therefore, the concrete 120, until the state of the surface alpha ₂ is brought into contact with the surface gamma ₁ aperture plate 110 is pushed to the both ends of the opening 111 is slid by grating material plate 130. When the grating plate 130 is pushed downward until the lower surface thereof contacts the upper surface of the high step portion 111 b, the grating plate 130 is fixed to the opening plate 110 using the bolts 140. Thus, the lid fixing method of the present invention is completed.

  In the above-described lid fixing method, not only the grating plate 130 but also the concrete plate 120 is fixed to the aperture plate 110 and does not jump up, although the grating plate 130 is only fixed to the aperture plate 110 with the bolts 140. It has become. In addition, the concrete plate 120 can be removed from the opening plate 110 only by removing the bolt 140 and removing the grating plate 130 from the opening plate 110. In addition, since the opening 111 can be opened and closed in such a small number of steps, it is possible not only to efficiently perform construction work such as side grooves but also to efficiently perform maintenance work and repair work. Yes. Further, since the amount of the expensive grating plate 130 used can be reduced, the cost can be reduced.

100 Top plate for gutter 110 Opening plate (opening member)
111 opening 111a low step (first step)
111b High step (second step)
120 Concrete plate (lid plate A for opening)
121 convex portion 130 grating plate (lid plate B for opening)
140 bolts (fixing means)
α ₁ plane α ₂ plane β ₁ plane γ ₁ plane θ ₁ plane α ₁ tilt angle θ ₂ plane α ₂ tilt angle θ ₃ plane β ₁ reverse tilt angle θ ₄ plane γ ₁ reverse tilt angle

Claims (6)

An opening member provided with an opening;
An opening cover plate A covering a specific section in the opening;
An opening cover plate B that covers another section adjacent to the specific section in the opening;
A lid fixing structure using
Of the surfaces constituting the outer peripheral surface of the opening lid A, a pair of surfaces α ₁ and α ₂ facing opposite sides are formed so as to be inclined downward,
Of the surfaces constituting the outer peripheral surface of the opening lid plate B, a surface β _{1 that} is in contact with the surface α ₁ of the opening lid plate A is formed with an inclination opposite to the surface α ₁ .
Of each inner peripheral surface forming the opening in the opening member, a surface γ _{1 that} is in contact with the surface α ₂ of the opening cover plate A is formed with an inclination opposite to the surface α ₂ .
After fitting the opening cover plate A into the specific section in the opening, the opening cover plate B is fitted into the other section in the opening , and the opening cover B is opened by a fixing means. by fixed in a state of pressed downward against member, and surface alpha ₁ of the opening lid plate a is pressed in terms beta ₁ of the lid plate B for opening, the lid plate B opening A lid fixing structure , wherein the opening lid plate A is held in a wedge shape with respect to the opening member between the surface β ₁ and the surface γ ₁ of the opening. Fixing structure of the cover according to claim 1, wherein the adhered rubber sheet on the surface alpha ₁ or surface beta ₁ of the opening lid plate B of the lid plate A opening. Fixing structure of the cover according to claim 1 or 2, wherein there use bolts as the fixing means. The lid fixing structure according to any one of claims 1 to 3 , wherein a pair of opening cover plates A covers both end portions of the opening, and the opening cover plate B covers a central portion of the opening. The lid fixing structure according to any one of claims 1 to 4, wherein the opening member and the opening cover plate A are made of concrete, and the opening cover plate B is formed by grating. Claim 1-5 lid fixing method for fixing the cover plate A and the opening lid plate B opening using a fixed structure of the cover according to any one the opening member.

Images