JP2021031885A - Retrofit cover member for liner plate - Google Patents

Abstract

To provide a retrofit cover member for liner plates that can be attached to existing liner plates without drilling holes in the liner plate, and can be firmly attached to the liner plate.SOLUTION: The openings 42,43 are provided at both circumferential ends of the plate body by providing a pre-attached cover member 41 on the outside of the plate body made of corrugated steel. The retrofit cover member 10, which is retrofitted to the open portions 42,43 and covers the open portions 42,43, covers the open portions 42,43 and has a flatly formed lid body part 11. A magnet 13 that is adsorbed to the plate body is provided on the back side of the cover body part 11. By adsorption of the magnet 13, the retrofit cover member 10 is attached to the open portions 42,43.SELECTED DRAWING: Figure 4

Description

The present invention relates to a retrofit lid member for a liner plate.

When constructing a stand such as a foundation, a cylindrical wall is installed as a retaining wall in the shaft. The cylindrical wall body is constructed by using a plurality of liner plates formed in an arc shape by corrugated steel plates and connecting them in the circumferential direction and the axial direction (vertical direction) of the cylinder. The liner plates are connected to each other in the circumferential direction by aligning the positions of a plurality of bolt holes provided at the circumferential ends of each liner plate, inserting bolts into the bolt holes, and tightening with nuts. A lid member is attached to the outside of the liner plate made of corrugated steel plate, whereby the outer peripheral portion of the liner plate is smoothed.

Regarding the attachment of such a lid member, if the entire outer surface is covered by the lid member, an area for fastening work using bolts and nuts is secured when the liner plates are connected to each other in the circumferential direction. Can not. Therefore, it has been proposed to divide the lid member into a front-mounted one and a retrofitted one (see, for example, Patent Document 1). In this technique, the front lid member is attached with an open portion provided at the circumferential end of the liner plate, and the opening portion is used to perform fastening work for connecting the liner plates to each other. After that, a retrofit lid member is attached to the open portion, and a state in which substantially the entire outer surface of the liner plate is covered by the lid member is formed.

Japanese Unexamined Patent Publication No. 2016-186160

In the above-mentioned prior art, as a configuration for attaching the retrofit lid member to the open portion, the liner plate is formed with notches at both upper and lower ends of the portion where the open portion is formed. On the other hand, hook portions that engage with the notches are provided at both the upper and lower ends of the retrofit lid member. By engaging the upper and lower hook portions with the notches on the liner plate side, the retrofit lid member is attached to the open portion.

However, since it is necessary to inspect and verify whether the required performance of the strength of the liner plate can be ensured even if the notch is formed, the existing liner plate cannot be used. Further, since the retrofit lid member is deformed and attached, if the retrofit lid member is easily deformed, the retrofit lid member is likely to come off, and if the retrofit lid member is difficult to deform, the retrofit lid member is engaged with the notch. There is a problem that it becomes difficult. Furthermore, since the mounting configuration is such that the hooks are simply engaged with the notches at both the upper and lower ends of the retrofit lid member, if the vertical height of the liner plate is increased, the upper and lower intermediate parts are likely to float, and as a result, the retrofit is retrofitted. There is also concern that the lid member may come off easily.

Therefore, the present invention is a retrofit lid member for a liner plate that can be attached to an existing liner plate without drilling a hole in the liner plate and can be firmly attached to the liner plate. The purpose is to provide.

In order to solve the above problems, the present invention
On the outside of the liner plate made of corrugated steel, the region of the outside excluding the peripheral end is covered with the front lid member, so that the corrugated steel plate is exposed at the end in the vertical direction of the liner plate. A rear lid member for a liner plate, which is provided with an open portion and is retrofitted to the open portion to cover the open portion.
A lid body that covers the open portion and is formed flat,
It is provided on the back surface side of the lid main body portion, is arranged in a space formed between the lid main body portion and the liner plate in a state where the open portion is covered by the lid main body portion, and is attracted to the liner plate. Magnet and
It is characterized by having.

According to the present invention, the retrofit lid member is attached to the open portion by attracting the magnet to the liner plate. Here, paying attention to the corrugated shape of the liner plate, the magnet is placed in the space formed between the liner plate and the lid body, so that no additional processing is required to attach the lid body to the liner plate. Therefore, it is not necessary to deform the lid main body when attaching the retrofit lid member. Therefore, the retrofit lid member can be attached to the existing liner plate without drilling the liner plate, and the retrofit lid member can be firmly attached to the liner plate.

It is a figure which shows the retrofit lid member for a liner plate, (a) is a front view, (b) is a side view. It is a figure which shows the state which the retrofit lid member shown in FIG. 1 is turned upside down, (a) is a front view, (b) is a side view. A perspective view showing a connecting portion in the circumferential direction of an arc body and a peripheral portion thereof. The explanatory view for demonstrating the procedure of attaching a retrofit lid member to the open part of a connecting part. Explanatory drawing for demonstrating the procedure of attaching a retrofit lid member to another opening part of a connecting part. It is sectional drawing which shows the state which attached the retrofit lid member, (a) is the sectional drawing of FIG. 4C, and (b) is the sectional view of FIG. 5C.

Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings.

First, the liner plate 20 to which the retrofit lid member 10 for the liner plate (see FIGS. 1 and 2) is attached will be briefly described.

As shown in FIG. 3, the liner plate 20 has an arc-shaped plate body 21 formed of corrugated steel plates as its basic configuration. The plate body 21 is longer in the circumferential (arc) direction than in the axial direction (vertical direction), and is formed so as to form a rectangular shape when viewed from the inside and outside of the arc. The wave shape of the plate body 21 is formed so as to be corrugated along the vertical direction.

Generally, the wave shape of the plate body 21 is vertically symmetrical with respect to a straight line extending horizontally at the center in the vertical direction. In the plate main body 21 of the present embodiment, two mountain portions 22 are provided in the middle portion in the vertical direction when viewed from the outside, and three valley portions 23 are provided on both sides in the vertical direction of the mountain portion 22 (also in FIG. 6). reference). The cross-sectional shapes of the mountain portion 22 and the valley portion 23 are formed to be substantially the same. The top portion of the mountain portion 22 and the bottom portion of the valley portion 23 are connected by an inclined portion 24 (FIG. 6). Flat surfaces 25 and 26 are provided at both upper and lower ends of the plate body 21, respectively. A mountain portion 22 and a valley portion 23 are provided between the flat surfaces 25 and 26, and a valley portion 23 is provided following the flat surfaces 25 and 26. The top portion of the mountain portion 22 and the flat portions 25 and 26 are at the same position when viewed from the inside and outside of the plate main body 21.

The four sides of the plate body 21 have a pair of circumferential flanges 31 and 32 and a pair of axial flanges 33 and 34. The circumferential flanges 31 and 32 are provided on the upper end side and the lower end side of the plate body 21, respectively, and are provided over the entire area of the plate body 21 in the circumferential direction. The circumferential flanges 31 and 32 are formed of a single steel plate together with the plate body 21. Axial flanges 33 and 34 are provided at both ends in the circumferential direction of the plate body 21 over the entire area of one side extending in the vertical direction. Axial flanges 33 and 34 are formed by welding flat plate members to both ends of the plate body 21 in the circumferential direction.

Two liner plates 20 are connected in the vertical direction to form one arc body R. As shown in FIG. 6, the liner plates 20 for forming the arc body R are connected to each other by using a fastener T1 composed of bolts and nuts.

A cylindrical wall body (not shown) is formed by connecting a plurality of (for example, 4 to 5) arc bodies R in the circumferential direction. As shown in FIG. 3, the arcuate bodies R are also connected to each other in the circumferential direction by using the fastener T2 made of bolts and nuts. Bolt holes (not shown) are formed in the axial flanges 33 and 34 corresponding to the valley portions formed by the corrugated shape of the plate body 21. This bolt hole (not shown) is used to connect the arcuate bodies R in the circumferential direction, and the fastening work is performed from the outside of the plate body 21.

L-shaped members 36 and 37 are provided at the upper ends and lower ends of the arc bodies R1 and R2 over the entire circumferential direction of the arc bodies R. When the arcuate bodies R are connected vertically, L-shaped members 36 and 37 are used.

In the arc body R, each of the upper and lower liner plates 20 is provided with a front lid member 41 on the outside thereof. The front lid member 41 is attached to the plate body 21 by a screw B. By attaching the front lid member 41, a right opening portion 42 and a left opening portion 43 are formed at a connecting portion A between arc bodies R adjacent to each other in the circumferential direction. Two right opening portions 42 are provided at the upper and lower ends of one arc body R1 in the circumferential direction on the right side when the connecting portion A is viewed from the outside. Two left opening portions 43 are provided on the left side when the connecting portion A is viewed from the outside, at the right end portion in the circumferential direction of the other arc body R2. As a result, the connecting portion A is provided with a total of four opening portions 42, 43.

The circumferential lengths (widths) of the open portions 42 and 43 are substantially the same, and the width (circumferential length) between the axial flanges 33 and 34 and the edge of the front lid member 41 is each open. It is the width (length in the circumferential direction) of the portions 42 and 43. In each of the opening portions 42 and 43, the plate main body 21 is opened over the entire vertical direction. Using these open portions 42 and 43, arc bodies R1 and R2 adjacent to each other in the circumferential direction are connected by an operator from the outside of the liner plate 20 using the fastener T2.

In the open portions 42 and 43, the plate main body 21 is exposed toward the outside, and the peaks 22 and valleys 23 formed by the wave shape appear. On the right side of the right opening portion 42, the circumferential end edge of the front lid member 41 extends in the vertical direction, and on the left side of the left opening portion 43, the circumferential end edge of the front lid member 41 extends in the vertical direction.

Next, the retrofit lid member 10 will be described. As shown in FIGS. 1 and 2, the retrofit lid member 10 has a lid main body portion 11, a pair of projecting pieces 12, and a magnet 13.

The lid main body 11 is formed of a steel plate so as to be long and rectangular, and the entire front and back surfaces are formed to be flat. Is the length of the lid main body 11 in the lateral direction the same as or slightly shorter than the circumferential length of the open portions 42 and 43, and is the length in the longitudinal direction the same as the vertical length of the open portions 42 and 43? It is formed slightly shorter than that.

When the retrofit lid member 10 is attached to the open portions 42 and 43, the longitudinal direction of the lid main body portion 11 becomes the vertical direction. Further, of the pair of long side portions 11a and 11b of the lid main body portion 11, the side adjacent to the pre-attached lid member 41 in the circumferential direction is pre-attached as shown in FIGS. 4 (c) and 5 (c) described later. It is in a state of being adjacent to the peripheral edge of the lid member 41 and extending in the vertical direction along the edge.

The pair of projecting pieces 12 are provided so as to project from one of the pair of long side portions 11a and 11b in the lateral direction. One of the pair of projecting pieces 12 is arranged closer to one end than the central portion in the longitudinal direction of the lid main body portion 11, and the other is arranged closer to the other end than the central portion in the longitudinal direction, and the intermediate portion in the longitudinal direction of the right long side portion 11a. It is provided apart from each other on both sides of the lid. Each projecting piece 12 is provided in a state where the plate surface of a rectangular steel plate is overlapped with the back surface of the lid main body 11, and is attached to the lid main body 11 by joining the two by welding. Each projecting piece 12 is formed to have a vertical width smaller than the distance between adjacent mountain portions 22.

One magnet 13 is provided, and is provided between the pair of projecting pieces 12 on the back surface side of the lid main body 11, and in the middle portion in the longitudinal direction of the lid main body 11. As shown in FIGS. 1 (b) and 2 (b), a magnet support 14 made of a steel plate is attached to the back surface of the lid main body 11. The magnet 13 is supported by the magnet support 14.

The magnet support 14 has a mounted piece 14a and a cantilever support piece 14b. The plate surface of the piece to be attached 14a is overlapped with the back surface of the lid main body 11, and the magnet support 14 is attached to the lid main body 11 by joining the two by welding in that state. The cantilever support piece 14b extends obliquely from the end of the mounted piece 14a with respect to the mounted piece 14a so as to form a V shape together with the mounted piece 14a. The cantilever support piece 14b is inclined so as to be along the inclined portion 24 of the plate body 21 of the liner plate 20.

As shown in FIG. 1, assuming that the pair of projecting pieces 12 project to the right from the right long side portion 11a of the lid main body portion 11 and the state shown in FIG. 1B is in the vertical direction, the cantilever support piece 14b It extends diagonally downward from the upper end of the attached piece 14a. In this state, as will be described later, the cantilever support piece 14b is attached to the right opening portion 42, and the cantilever support piece 14b is located above the valley portion 23 provided in the center of the three valley portions 23 of the plate body 21. Moreover, it faces the upper inclined portion 24a extending diagonally downward.

On the other hand, as shown in FIG. 2, the retrofit lid member 10 shown in FIG. 1 is inverted, and the pair of projecting pieces 12 project to the left from the left long side portion 11b of the lid main body portion 11 and are shown in FIG. 2 (b). Assuming that the indicated state is in the vertical direction, the cantilever support piece 14b extends obliquely upward from the upper end of the attached piece 14a. In this state, as will be described later, the cantilever support piece 14b is attached to the left opening portion 43, and the cantilever support piece 14b is located below the valley portion 23 provided in the center of the three valley portions 23 of the plate body 21. It faces the lower inclined portion 24b that exists and extends diagonally upward.

A magnet 13 is attached to the surface of the cantilever support piece 14b opposite to the surface facing the attached piece 14a. The magnet 13 is formed in a disk shape and is provided near the tip of the cantilever support piece 14b. Of the pair of circular surfaces of the magnet 13, the surface opposite to the side attached to the cantilever support piece 14b is the suction surface.

The retrofit lid member 10 has the above configuration and is attached to the open portions 42 and 43 formed in the connecting portions A of the arc bodies R1 and R2 shown in FIG. The installation is performed by the operator through the following procedure.

FIG. 4 shows a procedure for attaching the retrofit lid member 10 to the right opening portion 42 among the opening portions 42 and 43 provided in the connecting portion A between the arc bodies R1 and R2 shown in FIG. As shown in FIG. 4A, the operator holds the retrofit lid member 10 in a state in which the pair of projecting pieces 12 project to the right (the state shown in FIG. 1A). Next, as shown in FIG. 4B, the pair of projecting pieces 12 are inserted into the valley portion 23 inside the front lid member 41. At that time, by bringing the pair of projecting pieces 12 into contact with the edge of the front lid member 41, the pair of projecting pieces 12 serve as a guide for insertion. Then, as shown in FIG. 4C, the lid main body portion 11 of the retrofit lid member 10 is in a state where a smooth peripheral surface is formed together with the front lid member 41. As a result, the entire area of the right opening portion 42 is closed by the retrofit lid member 10.

In this state, the right long side portion 11a on the side where the projecting piece 12 protrudes from the lid main body portion 11 is adjacent to the end edge of the front lid member 41 and extends in the vertical direction with the end faces facing each other. On the other hand, the left long side portion 11b is adjacent to the axial flange 33 provided on the left side of the arc body R1 on the right side, and the end surface of the left long side portion 11b faces the flat surface portion of the axial flange 33 in the vertical direction. Extends to. Further, a pair of projecting pieces 12 are in contact with the back surface of the circumferential end portion of the front lid member 41 attached to the arc body R1 on the right side.

As shown in FIG. 6A, a magnet 13 attached to a cantilever support piece 14b extending diagonally downward is provided on the back surface side of the rear lid member 10. In a state where the right opening portion 42 is closed by the retrofit lid member 10, the magnet support 14 is housed in the central valley portion 23 of the plate body 21, and the suction surface of the magnet 13 is an upper inclined portion extending diagonally downward. It is adsorbed on 24a. By this suction, the retrofit lid member 10 is attached to the right opening portion 42 of the connecting portion A, the upper end portion of the lid main body portion 11 abuts on the upper flat portion 25 of the plate main body 21, and the lower end portion is below the plate main body 21. It abuts on the side plane portion 26. In this state, the retrofit lid member 10 is securely held. The central valley portion 23 corresponds to the space formed between the lid main body portion 11 and the liner plate 20.

FIG. 5 shows a procedure in which the retrofit lid member 10 is attached to the left opening portion 43 of the opening portions 42, 43 provided in the connecting portion A between the arc bodies R1 and R2 shown in FIG. As shown in FIG. 5A, the operator holds the retrofit lid member 10 in a state in which the pair of projecting pieces 12 project to the left (the state shown in FIG. 2) in the front view. In order to obtain this state, it is sufficient to turn the pair of projecting pieces 12 upside down from the state in which the pair of projecting pieces 12 project to the right (the state shown in FIG. 1A) in the front view.

Next, as shown in FIG. 5B, the pair of projecting pieces 12 are inserted into the valley portion 23 inside the front lid member 41. At that time, by bringing the pair of projecting pieces 12 into contact with the edge of the front lid member 41, the pair of projecting pieces 12 serve as a guide for insertion. Then, as shown in FIG. 5C, the lid main body portion 11 of the retrofit lid member 10 is in a state where a smooth peripheral surface is formed together with the front lid member 41. As a result, the entire area of the left opening portion 43 is closed by the retrofit lid member 10.

In this state, the left long side portion 11b on the side where the projecting piece 12 protrudes from the lid main body portion 11 is adjacent to the end edge of the front lid member 41 and extends in the vertical direction with the end faces facing each other. On the other hand, the right long side portion 11a is adjacent to the axial flange 34 provided on the right side of the arc body R2 on the left side, and the end surface of the right long side portion 11a faces the flat surface portion of the axial flange 34 in the vertical direction. Extends to. Further, a pair of projecting pieces 12 are in contact with the back surface of the circumferential end portion of the front lid member 41 attached to the arc body R2 on the left side.

As shown in FIG. 6B, the magnet 13 is provided on the cantilever support piece 14b extending diagonally upward on the back side of the retrofit lid member 10 which is inverted from the state of being attached to the right opening portion 42. In a state where the left opening portion 43 is closed by the retrofit lid member 10, the magnet support 14 is housed in the central valley portion 23 of the plate body 21, and the suction surface of the magnet 13 is inclined downward so as to extend diagonally upward. It is adsorbed on the part 24b. By this suction, the retrofit lid member 10 is attached to the left opening portion 43 of the connecting portion A, the upper end portion of the lid main body portion 11 abuts on the upper flat portion 25 of the plate main body 21, and the lower end portion is the lower side of the plate main body 21. It abuts on the flat surface portion 26. In this state, the retrofit lid member 10 is securely held. Also here, the central valley portion 23 corresponds to the space formed between the lid main body portion 11 and the liner plate 20.

As described above, the following effects can be obtained by using the retrofit lid member 10 to close the open portions 42 and 43 of the connecting portion A.

(1) The retrofit lid member 10 is attached to the open portions 42 and 43 by attracting the magnet 13 provided on the back surface side of the lid main body 11 to the plate main body 21. Therefore, the retrofit lid member 10 can be attached without drilling the liner plate 20. Further, unlike the conventional technique in which the hook portions provided on the upper and lower ends are engaged with the notches and attached, the retrofit lid member 10 is attached to the liner plate 20 by utilizing the attractive force of the magnet 13. Can be firmly attached.

(2) In the conventional retrofit lid member, the hook portions provided at both the upper and lower ends and the lid main body portion are on the same surface, so that if the hook portion is inserted into the notch on the liner plate 20 side, the whole is distorted. There is. In this respect, in the retrofit lid member 10 of the present embodiment, since the magnet 13 is attached by being attracted to the plate main body 21, it is not necessary to deform the lid main body portion 11. Therefore, it can be fixed exactly so that there is no unnecessary gap while ensuring sufficient strength.

(3) The conventional retrofit lid member is attached to the opening portions 42 and 43 by engaging the hook portions provided at the upper and lower ends with the notches, and the attachment portions to the plate main body 21 are present at the upper and lower ends. Therefore, when the retrofit lid member becomes long in the longitudinal direction, the intermediate portion in the longitudinal direction (vertical direction) in the non-mounted state floats outward and curves, thereby forming a gap connected to the inside of the retrofit lid member 10. Was a concern. In that respect, the retrofit lid member 10 of this embodiment is attached to the opening portions 42 and 43 by attracting the magnet 13 provided in the intermediate portion in the longitudinal direction on the back surface side of the lid main body portion 11 to the plate main body 21. Therefore, it is possible to prevent the intermediate portion of the retrofit lid member 10 in the longitudinal direction from floating and bending.

(4) The magnet 13 is inclined by the cantilever support piece 14b so that the suction surface is inclined along the inclined surfaces of the inclined portions 24a and 24b forming the wave shape of the plate main body 21, and the back surface side of the lid main body portion 11. It is provided in. The suction surface of the magnet 13 is in a state of either diagonally downward or diagonally upward, and is attracted to the upper inclined portion 24a or the lower inclined portion 24b of the central valley portion 23 of the plate main body 21.

Generally, the plate body 21 of the liner plate 20 has a plurality of peaks 22 and valleys 23, and has a vertically symmetrical wave shape. When the attachment target of the retrofit lid member 10 is such a liner plate 20, in the retrofit lid member 10 of the present embodiment, the suction surface is inclined along the inclination of the inclined portion 24, and the upper inclined portion 24a and the lower side are inclined. The magnet 13 is supported so as to be attracted to one of the side inclined portions 24b. If the retrofit lid member 10 is turned upside down from there, the direction in which the suction surface is inclined is also reversed, and the suction surface can be attracted to the other inclined portions 24a and 24b. Therefore, the retrofit lid member 10 having the projecting piece 12 protruding from one of the long side portions 11a and 11b can be attached to either the right opening portion 42 or the left opening portion 43.

(5) The magnet 13 attracted to the inclined portions 24a and 24b of the plate main body 21 is provided near the tip of the inclined cantilever support piece 14b. Therefore, even if there is a variation in the inclination of the inclined portions 24a and 24b to be attracted by the magnet 13, the variation can be absorbed by the bending of the cantilever support piece 14b. As a result, the number of types of liner plates 20 to be attached increases, and the versatility of the retrofit lid member 10 can be enhanced.

The present invention is not limited to the configuration of the retrofit lid member 10 of the above embodiment, and for example, the following configuration may be adopted.

(A) In the above embodiment, the pair of projecting pieces 12 are formed separately from the lid main body 11, and are joined to the lid main body 11 by welding or the like. Instead of this, both may be integrally formed, such as by cutting a steel plate into a shape in which the lid main body 11 and the pair of projecting pieces 12 are provided.

(B) In the above embodiment, the pair of projecting pieces 12 are provided on both sides of the long side portions 11a and 11b of the lid main body portion 11 with the intermediate portion in the longitudinal direction interposed therebetween. The position is arbitrary, and may be provided, for example, on the end side of the position shown in FIGS. 1 and 2. Further, the shape, size, and protrusion length of the projecting piece 12 are also arbitrary, and the tip may be formed in an arc shape or the protrusion length may be made longer, instead of being rectangular as in the embodiment.

(C) In the above embodiment, the magnet 13 is provided between the pair of projecting pieces 12 and in the intermediate portion in the longitudinal direction of the lid main body portion 11. Instead of this, the magnet 13 may be provided at a position offset to one side in the longitudinal direction of the lid main body 11.

(D) In the above embodiment, the magnet 13 is cantilevered by the cantilever support piece 14b of the magnet support 14. Instead of this, for example, the magnet support 14 may be formed by a block-shaped member having an inclined surface. Further, even in a configuration in which the magnet 13 is cantilevered, the magnet 13 is not provided on the tip end side of the cantilever support piece 14b, but is provided at an intermediate portion between the proximal end side and the distal end portion or at a position closer to the proximal end. You may do so.

(E) In the above embodiment, one disk-shaped magnet 13 is provided with the suction surface inclined along the inclined portion 24 of the plate main body 21, and the inclined portion 24 of the plate main body 21 is provided. It is designed to be adsorbed on. Instead of this, for example, a magnet that attracts the bottom of the valley 23 may be provided, or a thin plate-shaped magnet that attracts the outer surface of the plate body 21 may be provided. Further, a plurality of magnets 13 may be provided, and it is the same even if the magnet configuration is different from that of the magnet 13 of the above embodiment. Further, the planar shape of the magnet 13 may be a shape other than a circular shape such as a quadrangular shape.

(F) In the above embodiment, two liner plates 20 are connected in the vertical direction to form one arc body R, and a plurality of arc bodies R are connected in the circumferential direction to form a cylindrical wall body (not shown). An example is shown. Instead of this, three or more liner plates 20 may be connected in the vertical direction to form an arc body R, or a plurality of liner plates 20 may be connected in the circumferential direction to form an arc body. Further, instead of connecting a plurality of liner plates 20 to form an arc body R once and connecting them to form a cylindrical wall body, one liner plate 20 is connected in the circumferential direction to form a cylindrical wall body. (Not shown) may be formed.

(G) In the above embodiment, the corrugated shape of the plate body 21 of the liner plate 20 has two mountain portions 22 in the middle portion in the vertical direction and valley portions provided on both sides in the vertical direction of the mountain portion 22 when viewed from the outside. Three 23's are provided, and the shape is vertically symmetrical. The number of peaks 22 and valleys 23 of the wave shape of the plate body 21 is arbitrary, and the wave shape may be vertically asymmetrical. However, when the wave shape of the plate body 21 is vertically asymmetrical, it is conceivable that the suction positions of the magnets 13 may not be aligned when the retrofit lid member 10 is inverted. In that case, a retrofit lid member suitable for each of the left and right opening portions 42 and 43 is prepared.

10 ... Retrofit lid member, 11 ... Lid body, 12 ... Projection piece, 13 ... Magnet, 14 ... Magnet support, 14b ... Cantilever support piece, 20 ... Liner plate, 23 ... Valley part, 24 ... Inclined part, 41 ... Pre-attached lid member, 42, 43 ... Open part.

Claims (5)

On the outside of the liner plate made of corrugated steel plate, the region of the outside excluding the end portion in the circumferential direction is covered with the front lid member, so that the corrugated steel plate is exposed at the end portion in the vertical direction of the liner plate. A rear lid member for a liner plate, which is provided with an open portion and is retrofitted to the open portion to cover the open portion.
A lid body that covers the open portion and is formed flat,
It is provided on the back surface side of the lid main body portion, is arranged in a space formed between the lid main body portion and the liner plate in a state where the open portion is covered by the lid main body portion, and is attracted to the liner plate. Magnet and
A retrofit lid member for liner plates. The lid main body is provided with a projecting piece to be inserted into a space formed between the front lid member and the liner plate while the open portion is covered by the lid main body.
Since the projecting piece is fixed to the back surface of the lid main body portion, the projecting piece is in contact with the pre-attached lid member while being in contact with the lid main body portion in a state where the open portion is covered by the retrofit lid member. The retrofit lid member for a liner plate according to claim 1, which is configured such that end faces adjacent to each other with the front lid member face each other. With a pair of the above-mentioned protrusions,
The pair of protrusions are arranged above and below the lid main body portion so as to be separated from each other.
The retrofit lid member for a liner plate according to claim 2, wherein the magnet is arranged at a position sandwiched between the pair of projecting pieces when viewed in the vertical direction. A magnet support provided on the back surface of the lid main body and supporting the magnet in a state where the suction surface of the magnet is inclined with respect to the lid main body is further provided.
The liner plate according to any one of claims 1 to 3, wherein the suction surface is inclined along an inclined portion between a mountain portion and a valley portion forming a wave shape of the liner plate. Retrofit lid member. The magnet support includes a cantilever support piece that cantilever supports the magnet in a state where the suction surface is inclined.
The retrofit lid member for a liner plate according to claim 4, wherein the magnet is provided near the tip of the cantilever support piece.

Images