Reinforcement hardware for manway openings, manway opening reinforcement structure, and manway opening reinforcement method

Abstract

To provide human passage opening reinforcing hardware which is composed in a state that a length can be adjusted, can be attached corresponding to various sizes of human passage openings, and reduces manufacturing and construction costs.SOLUTION: Human passage opening reinforcing hardware 10 is attached by being stretched between one side face 3 and the other side face 4 of a human passage opening 2 formed in a rising portion 1 of a building foundation. The human passage opening reinforcing hardware 10 comprises: a pair of cylindrical portions 11, 12 fixed to each of the one side face 3 and the other side face 4; and a rod-shaped connecting portion 13 stretched between the pair of cylindrical portions 11, 12 and connecting the pair of cylindrical portions 11, 12 with each other. One longitudinal end portion 13a of the connecting portion 13 is inserted into an interior of the one cylindrical portion 11 of the pair of cylindrical portions 11, 12 so as to be able to advance and retreat, and the other longitudinal end portion 13b of the connecting portion 13 is inserted into an interior of the other cylindrical portion 12 of the pair of cylindrical portions 11, 12 so as to be able to advance and retreat.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a manway reinforcement hardware, a manway reinforcement structure, and a manway reinforcement method. [Background technology]

[0002] In buildings such as houses, manholes for underfloor inspection are formed in the thickness direction at the rising portions of reinforced concrete slab foundations or continuous foundations. Because this causes cross-sectional defects in the concrete at the rising portions and also separates the internal reinforcing bars, manholes have traditionally been reinforced (see, for example, Patent Documents 1 and 2). The opening reinforcement unit of Patent Document 1 aims to reinforce a pedestrian opening by bridging a bridging member between the left and right side plates of a U-shaped reinforcing frame plate that opens upward. The connecting member of Patent Document 2 is bridged between anchor bolts protruding from both end faces of the manway and connected with connecting nuts to reinforce the manway. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-155576 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-348883 Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of the opening reinforcement unit in Patent Document 1, a reinforcing frame plate or bridging member can be attached along the edge of the opening, which provides a high reinforcement effect for the opening, but a dedicated opening reinforcement unit must be prepared for each opening to match the height and width of the opening. In other words, opening reinforcement units must be prepared in multiple sizes, which can make it difficult to keep manufacturing costs down. On the other hand, in the case of the connecting member in Patent Document 2, once the anchor bolts can be buried in the foundation, the only thing that remains to be done is to connect the connecting member to the anchor bolts with connecting nuts, thereby reinforcing the manhole, and therefore the structure is simpler and it is easier to keep costs down than the opening reinforcement unit in Patent Document 1. However, in the case of Patent Document 2 as well, the connecting member is configured to have a length that is set to approximately the same as the distance between the anchor bolts on both sides, so the length must be changed depending on the width of the manhole (the distance between the anchor bolts). In other words, as with Patent Document 1, connecting members formed in multiple lengths must be prepared, which ultimately makes it difficult to keep manufacturing costs down.

[0005] The present invention was made in consideration of the above circumstances, and its objective is to create a gate that is adjustable in length so that it can be installed to accommodate various sizes of manwayes, thereby reducing manufacturing and installation costs. [Means for solving the problem]

[0006] The invention described in claim 1 is, for example, as shown in Figures 1 to 3, a manway reinforcing hardware 10 that is installed between one side surface 3 and the other side surface 4 of a manway 2 formed in a rising portion 1 of a building foundation, a pair of cylindrical portions 11 and 12 fixed to the one side surface 3 and the other side surface 4, respectively; a rod-shaped connecting portion 13 that is bridged between the pair of cylindrical portions 11 and 12 and connects the pair of cylindrical portions 11 and 12 together, One end 13a of the connecting portion 13 in the length direction is inserted into one of the pair of cylindrical portions 11, 12 so as to be able to advance and retreat, and the other end 13b of the connecting portion 13 in the length direction is inserted into the other of the pair of cylindrical portions 11, 12 so as to be able to advance and retreat. And, The connecting portion 13 is constituted by a first bolt member 13, The cylindrical portions 11 and 12 are Main body cylindrical portions 11a and 12a, a first annular plate portion (11b, 12b) having a hole formed in the center through which the first bolt member (13) is passed, the first annular plate portion (11b, 12b) being integrally provided at an end of the main body cylindrical portion (11a, 12a) on the first bolt member (13) side; and first nut members 11c, 12c that are integrally provided on the inner surfaces of the first annular plate portions 11b, 12b and into which the first bolt member 13 is screwed.It is characterized by the fact that

[0007] According to the invention described in claim 1, the length between the pair of cylindrical portions 11, 12 can be easily changed by appropriately adjusting the length by which one longitudinal end 13a of the connecting portion 13 penetrates into one cylindrical portion 11 and the length by which the other longitudinal end 13b of the connecting portion 13 penetrates into the other cylindrical portion 12, so that the manway reinforcement metal fitting 10 is configured in a state where the overall length can be adjusted. This allows it to be attached to manway 2 of various sizes, increasing versatility and reducing manufacturing and construction costs.

[0009] Also When adjusting the length by which one longitudinal end 13a of the first bolt member 13 penetrates into one tubular portion 11 and the length by which the other longitudinal end 13b of the first bolt member 13 penetrates into the other tubular portion 12, the length can be easily adjusted by simply rotating the pair of tubular portions 11, 12.

[0010] Claim 2 The invention described in the above can be implemented as follows, for example, as shown in FIGS. 1 to 3. 1 In the pedestrian entrance reinforcement hardware 10 described in The device further includes a pair of fixed portions 15 and 16 provided on the one side surface 3 and the other side surface 4, respectively, to which the pair of cylindrical portions 11 and 12 are fixed, The cylindrical portions 11 and 12 are A hole is formed in the center, and second annular plate portions 11d, 12d are integrally provided at the ends of the main body cylindrical portions 11a, 12a on the side surfaces 3, 4 of the manway 2; and second bolt members 11e, 12e that are integrally formed on the inner surfaces of the second annular plate portions 11d, 12d and have tip portions that protrude from central holes in the second annular plate portions 11d, 12d toward the side surfaces 3, 4 of the manway 2, The fixed portions 15, 16 are characterized by being constituted by cylindrical insert members 15, 16 having internal threads.

[0011] Claim 2 According to the invention described above, a pair of fixed portions 15, 16 are provided on one side surface 3 and the other side surface 4, respectively, so that a pair of tubular portions 11, 12 can be securely fixed to one side surface 3 and the other side surface 4, respectively. Furthermore, the tubular portions 11, 12 have second bolt members 11e, 12e that protrude toward the side surfaces 3, 4 of the manway 2, so that the tubular portions 11, 12 can be easily fixed to the side surfaces 3, 4 of the manway 2 simply by rotating and attaching the tubular portions 11, 12 toward the tubular insert members 15, 16 on one side surface 3 and the other side surface 4, which have internal female threads.

[0012] Claim 3 The invention described in the above can be implemented as follows, for example, as shown in FIGS. 1 to 3. 2 In the pedestrian entrance reinforcement hardware 10 described in The fixed portions 15 and 16 are characterized by having connecting portions 15 a and 16 a that are connected to the internal reinforcing bars 6 of the rising portion 1 .

[0013] Claim 3 According to the invention described above, the fixed parts 15, 16 have connection parts 15a, 16a that are connected to the internal reinforcing bars 6 of the rising part 1, so that the installation state of the fixed parts 15, 16 can be stabilized, thereby improving the installation state of the entire manway reinforcement hardware 10.

[0014] Claim 4 The invention described in the above can be implemented as follows, for example, as shown in FIGS. 1 to 3. 1 In the pedestrian entrance reinforcement hardware 10 described in The device is characterized by further comprising an operation receiving portion 14 (second nut member 14) that is provided on the first bolt member 13 and receives an operation for rotating the first bolt member 13 around its axis.

[0015] Claim 4According to the invention described in the above, by receiving an operation from the operation receiving unit 14 and rotating the first bolt member 13 about its axis, the first bolt member 13 can be moved forward and backward relative to the pair of cylindrical portions 11, 12. This makes it possible to remove the first bolt member 13 from the pair of cylindrical portions 11, 12 as needed, making it easier to remove the pair of cylindrical portions 11, 12 from the side surfaces 3, 4 of the manway 2.

[0016] Claim 5 The invention described above is a reinforcement structure for a manway, which is, for example, as shown in FIGS. 1 to 3, 4 The pedestrian entrance reinforcing hardware 10 according to any one of the preceding claims is attached between the one side surface 3 and the other side surface 4 of the pedestrian entrance 2, The one cylindrical portion 11 is fixed to the one side surface 3, The other cylindrical portion 12 is fixed to the other side surface 4, The connecting portion 13 is bridged between the pair of cylindrical portions 11 and 12 and connects the pair of cylindrical portions 11 and 12 to each other, The connecting portion 13 has one longitudinal end 13a inserted into the interior of one of the cylindrical portions 11, and the other longitudinal end 13b inserted into the interior of the other cylindrical portion 12, and is characterized in that the one longitudinal end 13a and the other longitudinal end 13b of the connecting portion 13 can alternately advance and retreat into the interiors of the pair of cylindrical portions 11, 12.

[0017] Claim 5According to the invention described in , one lengthwise end 13a and the other lengthwise end 13b of the connecting part 13 can alternately advance and retreat into the interior of the pair of tubular parts 11, 12, so that when attaching the manway reinforcing hardware 10 to the manway 2, it is possible to appropriately adjust the length by which one lengthwise end 13a of the connecting part 13 extends into the interior of one tubular part 11 and the length by which the other lengthwise end 13b of the connecting part 13 extends into the interior of the other tubular part 12. Therefore, the manway reinforcing hardware 10 can be attached by bridging between one side surface 3 and the other side surface 4 of the manway 2 while preventing the connecting part 13 from being removed from the one tubular part 11 or the other tubular part 12. Furthermore, since the insertion length of the connecting portion 13 relative to the pair of tubular portions 11, 12 can be adjusted, the manway reinforcement hardware 10 can be installed in the same installation method, spanning one side 3 and the other side 4 of the manway 2, regardless of the size of the manway 2, thereby improving versatility.

[0018] Claim 6 The invention described above can be realized as follows, for example, as shown in FIGS. 1 to 3: 4 A method for reinforcing the pedestrian entrance 2 using the pedestrian entrance reinforcing hardware 10 according to any one of the above, a step of fixing the one cylindrical portion 11, into which the one longitudinal end 13a of the connecting portion 13 has been inserted, to the one side surface 3 while moving the one cylindrical portion 11 in a direction away from the other cylindrical portion 12; and a process of fixing the other cylindrical portion 12, into which the other longitudinal end portion 13b of the connecting portion 13 has been inserted, to the other side surface 4 while moving it in a direction away from the one cylindrical portion 11.

[0019] Claim 6According to the invention described in the above, by performing at least one of the steps of fixing one tubular portion 11 to one side surface 3 while moving it in a direction away from the other tubular portion 12, and fixing the other tubular portion 12 to the other side surface 4 while moving it in a direction away from the one tubular portion 11, the manway reinforcing hardware 10 can be attached to the manway 2, thereby easily reinforcing the manway 2. Furthermore, because the length between the pair of tubular portions 11, 12 can be adjusted by moving one or the other tubular portions 11, 12, the manway reinforcing hardware 10 can be attached by bridging between one side surface 3 and the other side surface 4 of the manway 2 using a similar attachment method, regardless of the size of the manway 2, thereby improving versatility. [Effects of the Invention]

[0020] According to the present invention, the length is adjustable, so that it can be attached to various sizes of manwayes, thereby reducing manufacturing and installation costs. [Brief explanation of the drawings]

[0021] [Figure 1] This is an oblique view showing the state in which the manhole is reinforced by a manhole reinforcing metal fitting. [Figure 2] This is an elevational cross-sectional view showing the state in which the manway is reinforced by manway reinforcing hardware. [Figure 3] This is a cross-sectional plan view showing the state in which the manhole is reinforced by manhole reinforcing hardware. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are subject to various limitations that are technically preferable for implementing the present invention, but the technical scope of the present invention is not limited to the following embodiments and illustrated examples. Note that the directions in the following embodiments and illustrated examples are set solely for the convenience of explanation.

[0023] In Figures 1 to 3, reference numeral 1 indicates the rising portion of a foundation (a slab foundation or a continuous foundation) of a building such as a house. A manhole 2 is formed in the rising portion 1 at a location in the entire foundation of the building where people and equipment need to pass through for underfloor inspection. In other words, a building's foundation often has multiple manholes 2, but sometimes only one is formed.

[0024] The size of the opening 2 is set to allow a person to pass through, and in this embodiment, the opening size in the left-right direction is set to 600 mm, and the opening size in the up-down direction is set to 350 mm. The size of the rising portion 1 in the thickness direction (front-to-back direction) is generally set to, for example, about 120 mm to 150 mm.

[0025] The pedestrian entrance 2 is configured by forming the rising portion 1 in a concave shape, and has a left side surface 3 (one side surface 3), a right side surface 4 (the other side surface 4), and a bottom surface 5. Furthermore, a part (lower end) of the building skeleton such as a foundation is placed on the upper surface of the rising portion 1. Therefore, the part of the building skeleton is positioned so as to straddle the manway 2. In other words, the part of the building skeleton straddling the manway 2 forms the top surface of the manway 2.

[0026] Although a base or the like is placed across the upper surface of the rising portion 1, the manway 2 is open upward and is therefore reinforced by a manway reinforcing metal fitting 10. The position where the manway reinforcement metal fittings 10 are attached is between the upper end of the left side surface 3 and the upper end of the right side surface 4 of the manway 2, and they are attached by bridging these left and right side surfaces 3, 4.

[0027] The manway reinforcement metal fitting 10 comprises a pair of cylindrical portions 11, 12, a rod-shaped connecting portion 13, an operation receiving portion 14, and a pair of fixed portions 15, 16. The pair of cylindrical portions 11, 12 consists of one cylindrical portion 11 located on the left side and the other cylindrical portion 12 located on the right side. The pair of fixed portions 15, 16 includes one fixed portion 15 located on the left side and the other fixed portion 16 located on the right side.

[0028] The rod-shaped connecting portion 13 is configured to bridge between the pair of cylindrical portions 11, 12 and connect the pair of cylindrical portions 11, 12 to each other, and is formed by a first bolt member. In this embodiment, the first bolt member 13 is a fully threaded bolt without a head, and has a continuous male thread formed from one end 13a in the length direction to the other end 13b in the length direction. The length of the first bolt member 13 is not limited to the length in the example shown in FIGS. 2 and 3, and can be changed as appropriate within the scope of the present invention.

[0029] The pair of cylindrical portions 11, 12 are fixed to the left side surface 3 and the right side surface 4 of the manway 2, respectively, and are arranged so that the orientation of the cylinders (i.e., the arrangement direction of first annular plate portions 11b, 12b and second annular plate portions 11d, 12d, which will be described later) is in the left-right direction. One cylindrical portion 11, located on the left side, has its left end fixed to the left side surface 3 of the manway 2, and the other cylindrical portion 12, located on the right side, has its right end fixed to the right side surface 4 of the manway 2.

[0030] One cylindrical portion 11 has a main cylindrical portion 11a, a first annular plate portion 11b, a first nut member 11c, a second annular plate portion 11d, and a second bolt member 11e. Similarly, the other cylindrical portion 12 has a main cylindrical portion 12a, a first annular plate portion 12b, a first nut member 12c, a second annular plate portion 12d, and a second bolt member 12e. Since the pair of cylindrical portions 11, 12 are arranged symmetrically, only one cylindrical portion 11 will be described in detail below, and a detailed description of the other cylindrical portion 12 will be omitted.

[0031] The cylindrical body portion 11a is made of a so-called single pipe, and both ends in the length direction are open. The use of a single pipe as the cylindrical body portion 11a has the advantage of providing a high degree of freedom in the installation direction.

[0032] The first annular plate portion 11b is a circular metal plate material. A hole through which the first bolt member 13 is inserted is formed in the center of the first annular plate portion 11b, and the first annular plate portion 11b is welded to and integral with the end portion of the main body tubular portion 11a on the first bolt member 13 side (the center side of the manway 2).

[0033] The first nut member 11c is welded to the inner surface of the first annular plate portion 11b (the inner cylindrical surface of the main cylindrical portion 11a) and is provided integrally therewith. The first bolt member 13 is threaded into a central hole in the first annular plate portion 11b.

[0034] The second annular plate portion 11d is a circular metal plate material, and has a hole formed in the center through which the second bolt member 11e is passed. The second annular plate portion 11d is welded to the end portion of the main body cylindrical portion 11a on the left side surface 3 side of the manway 2, and is provided integrally with the main body cylindrical portion 11a.

[0035] The second bolt member 11e is a bolt with a head, and the head is welded to the inner surface of the second annular plate portion 11d (the inner cylindrical surface of the main cylindrical portion 11a) and is provided integrally therewith. The tip portion protrudes from a central hole in the second annular plate portion 11d toward the left side surface 3 of the manway 2.

[0036] The operation receiving unit 14 is provided on the first bolt member 13, which is the connecting portion 13, and is configured to receive an operation for rotating the first bolt member 13 about its axis. That is, the operation receiving unit 14 is provided on the first bolt member 13 in order to move the first bolt member 13 to one side or the other side. The operation refers to the work of an operator attempting to rotate the first bolt member 13 around its axis, and the work is performed with bare hands or using a tool.

[0037] More specifically, in this embodiment, the operation receiving unit 14 is configured by a second nut member 14 provided on the first bolt member 13. This second nut member 14 is a nut similar to the first nut member 11c. The second nut member 14 is welded to the center of the length of the first bolt member 13, and is configured to rotate the first bolt member 13 simultaneously by rotating it with a tool such as a wrench. When the first bolt member 13 is rotated until the second nut member 14 contacts the first annular plate portion 11b (12b) of one of the pair of cylindrical portions 11, 12, the other end of the first bolt member 13 is removed from the other cylindrical portion 12 (11). The length of the first bolt member 13 is set to a dimension that allows the other end of the first bolt member 13 to be removed from the other tubular portion 12 (11) when the second nut member 14 contacts the first annular plate portion 11b (12b) of either one of the pair of tubular portions 11, 12.

[0038] In this embodiment, a nut is used as the operation receiving unit 14, but the present invention is not limited to this, and the center portion of the first bolt member 13 in the longitudinal direction may be processed so that it can be gripped with a tool such as a wrench, and this portion may be used as the operation receiving unit 14. In other words, the first bolt member 13 does not necessarily have to be a fully threaded bolt.

[0039] The pair of fixed portions 15, 16 are provided on the left side surface 3 and the right side surface 4 of the manway 2, respectively, and the pair of cylindrical portions 11, 12 are fixed thereto. More specifically, the pair of fixed portions 15, 16 are configured by cylindrical insert members 15, 16 having internal threads. The pair of fixed portions 15, 16 are formed with an opening at one end in the length direction (the pair of cylindrical portions 11, 12 side), and are arranged so that the opening is exposed on the left side surface 3 and the right side surface 4 of the manway 2. Then, second bolt members 11e, 12e of the pair of cylindrical portions 11, 12 are screwed in and fixed through the exposed opening.

[0040] The pair of fixed portions 15 and 16 are embedded inside the rising portion 1 in advance. The pair of fixed portions 15 and 16 also have connecting portions 15a and 16a that are connected to the internal reinforcing bars 6 of the rising portion 1. The connecting portions 15a, 16a are a pair of metal rod-shaped members fixed to the ends of the pair of fixed portions 15, 16 on the opposite side from the manway 2. At least one of the pair of connecting portions 15a, 16a is provided so as to contact the internal reinforcing bar 6. It is desirable that the connecting portions 15a, 16a be welded to the internal reinforcing bar 6. That is, when forming the rising portion 1, the pair of fixed portions 15, 16 are assembled and welded together when the internal reinforcing bars 6 are assembled, and then concrete is poured. If the rising portion 1 is made of precast concrete, it is welded to the internal reinforcing bars 6 at the factory and assembled together.

[0041] Next, a method for reinforcing the manway 2 by attaching the manway reinforcing hardware 10 configured as described above to the manway 2 will be described. It is assumed that the pair of cylindrical portions 11 and 12 are in an assembled state with each portion welded together.

[0042] First, the pair of insert members 15, 16, which are the pair of fixed portions 15, 16, are embedded in the rising portion 1 with their respective connection portions 15a, 16a connected to the internal reinforcing bars 6. Then, the pair of cylindrical portions 11, 12 are positioned so that the openings on the side of the pair of cylindrical portions 11, 12 are exposed on the left side surface 3 and the right side surface 4 of the manway 2.

[0043] Next, one longitudinal end 13a of the first bolt member 13, on which the second nut member 14 serving as the operation receiving portion 14 is provided in advance, is attached to one of the cylindrical portions 11 and inserted into the interior of the one cylindrical portion 11. Furthermore, the other longitudinal end 13b of the first bolt member 13 is attached to the other cylindrical portion 12 and inserted into the other cylindrical portion 12. That is, the pair of cylindrical portions 11, 12 and the first bolt member 13 are combined together, and the distance between the pair of cylindrical portions 11, 12 is kept short. That is, the entire length of the portion of the manway reinforcement metal fitting 10 excluding the fixed portions 15, 16 is kept shorter than the length from the left side surface 3 to the right side surface 4 of the manway 2. Then, the portion of the manway reinforcing metal fitting 10 excluding the fixed portions 15 and 16 is placed between the left side surface 3 and the right side surface 4 of the manway 2 .

[0044] Next, one of the cylindrical parts 11 is fixed to the left side surface 3 of the manway 2. The tip of the second bolt member 11e protrudes from the left end of one of the tubular portions 11 through the central hole in the second annular plate portion 11d, and the tip of the second bolt member 11e is screwed into the tube of the insert member 15, thereby fixing one of the tubular portions 11 to the left side surface 3 of the manway 2. The second bolt member 11e is welded to the second annular plate portion 11d, and the second annular plate portion 11d is welded to the main body tubular portion 11a. Therefore, when the tip of the second bolt member 11e is screwed into the tube of the insert member 15, the entire one tubular portion 11 is rotated around the axis of the second bolt member 11e.

[0045] Next, the other cylindrical portion 12 is fixed to the right side surface 4 of the manway 2. The method of fixing the other tubular portion 12 to the right side surface 4 is the same as the method of fixing the one tubular portion 11 to the left side surface 3. That is, when the tip of the second bolt member 12e is screwed into the cylinder of the insert member 16, the entire other tubular portion 12 is rotated around the axis of the second bolt member 12e. At this time, the length by which one longitudinal end 13a of the first bolt member 13 extends into the one tubular portion 11 and the length by which the other longitudinal end 13b extends into the other tubular portion 12 are appropriately adjusted to prevent the first bolt member 13 from being removed from the one tubular portion 11 or the other tubular portion 12.

[0046] The order of the process of fixing one tubular portion 11 to the left side surface 3 of the manway 2 and the process of fixing the other tubular portion 12 to the right side surface 4 of the manway 2 may be reversed. Alternatively, these processes may be performed simultaneously. In other words, when reinforcing the manway 2 with the manway reinforcing hardware 10, at least one of the following processes is performed: a process of fixing one tubular portion 11, into which one longitudinal end 13a of the first bolt member 13 has been inserted, to one side surface 3 while moving it in a direction away from the other tubular portion 12; and a process of fixing the other tubular portion 12, into which the other longitudinal end 13b of the first bolt member 13 has been inserted, to the other side surface 4 while moving it in a direction away from the one tubular portion 11.

[0047] The one cylindrical portion 11 and the other cylindrical portion 12 are spaced as far apart as possible within a range in which the one longitudinal end portion 13a and the other longitudinal end portion 13b of the first bolt member 13 do not slip out of the one cylindrical portion 11 and the other cylindrical portion 12. This allows the manway reinforcing hardware 10 to be in a tensioned state between the left side surface 3 and the right side surface 4 of the manway 2.

[0048] In this manner, the manway reinforcing hardware 10 can be attached to the manway 2 to reinforce the manway 2. When inspecting under the floor, the first bolt member 13 is rotated about its axis via the second nut member 14, which is the operation receiver 14. Then, by inserting the first bolt member 13 into the interior of one of the pair of tubular members 11 (12), the first bolt member 13 is removed from the other tubular member 12, and the one tubular member 11 and the other tubular member 12 are separated. Then, one tubular member 11 is removed from the left side surface 3 of the manway 2, and the other tubular member 12 is removed from the right side surface 4 of the manway 2. This allows the manway reinforcement hardware 10 to be removed from the manway 2, allowing people and equipment to pass through. After the inspection under the floor is completed, the manway reinforcement hardware 10 is reattached to the manway 2 using the method described above.

[0049] According to this embodiment, the following excellent effects are achieved. That is, one longitudinal end 13a of the connecting portion 13 (first bolt member 13) is inserted into one of the pair of cylindrical portions 11, 12 so as to be able to advance and retreat, and the other longitudinal end 13b of the connecting portion 13 is inserted into the other of the pair of cylindrical portions 11, 12 so as to be able to advance and retreat, so that the length by which the one longitudinal end 13a of the connecting portion 13 extends into the interior of one of the cylindrical portions 11 and the length by which the other longitudinal end 13b of the connecting portion 13 extends into the interior of the other cylindrical portion 12 can be appropriately adjusted to easily change the length between the pair of cylindrical portions 11, 12. As a result, the manway reinforcement metal fitting 10 is configured in a state where its overall length can be adjusted, and therefore it can be attached to manwayes 2 of various sizes, increasing versatility and reducing manufacturing and construction costs.

[0050] Furthermore, when adjusting the length by which one longitudinal end 13a of the first bolt member 13, which is the connecting portion 13, penetrates into the interior of one tubular portion 11 and the length by which the other longitudinal end 13b of the first bolt member 13 penetrates into the interior of the other tubular portion 12, the length can be easily adjusted by simply rotating the pair of tubular portions 11, 12.

[0051] Furthermore, since a pair of fixed portions 15, 16 are provided on one side surface 3 and the other side surface 4, respectively, the pair of cylindrical portions 11, 12 can be reliably fixed to one side surface 3 and the other side surface 4, respectively.

[0052] In addition, the tubular portions 11, 12 have second bolt members 11e, 12e that protrude toward the side surfaces 3, 4 of the manway 2, so that the tubular portions 11, 12 can be easily fixed to the side surfaces 3, 4 of the manway 2 simply by rotating and attaching the tubular portions 11, 12 toward the tubular insert members 15, 16 on one side surface 3 and the other side surface 4, which have internal female threads.

[0053] Furthermore, since the pair of fixed parts 15, 16 have connection parts 15a, 16a that are connected to the internal reinforcing bars 6 of the rising part 1, the installation state of the pair of fixed parts 15, 16 can be stabilized, thereby improving the installation state of the entire manway reinforcement hardware 10.

[0054] Furthermore, by receiving an operation from the second nut member 14, which is the operation receiving unit 14, and rotating the first bolt member 13 about its axis, the first bolt member 13 can be moved forward and backward relative to the pair of cylindrical portions 11, 12. This makes it possible to remove the first bolt member 13 from the pair of cylindrical portions 11, 12 as needed, making it easier to remove the pair of cylindrical portions 11, 12 from the side surfaces 3, 4 of the manway 2.

[0055] Furthermore, one longitudinal end 13a and the other longitudinal end 13b of the connecting portion 13 (first bolt member 13) can alternately advance and retreat into the interior of the pair of tubular portions 11, 12, so that when attaching the manway reinforcing hardware 10 to the manway 2, it is possible to appropriately adjust the length by which one longitudinal end 13a of the connecting portion 13 extends into the interior of one tubular portion 11 and the length by which the other longitudinal end 13b of the connecting portion 13 extends into the interior of the other tubular portion 12. Therefore, the manway reinforcing hardware 10 can be attached by bridging between one side surface 3 and the other side surface 4 of the manway 2 while preventing the connecting portion 13 from being removed from one tubular portion 11 or the other tubular portion 12. Furthermore, since the insertion length of the connecting portion 13 relative to the pair of tubular portions 11, 12 can be adjusted, the manway reinforcement hardware 10 can be installed in the same installation method, spanning one side 3 and the other side 4 of the manway 2, regardless of the size of the manway 2, thereby improving versatility.

[0056] Furthermore, by performing at least one of the steps of fixing one tubular portion 11 to one side surface 3 while moving it in a direction away from the other tubular portion 12, and fixing the other tubular portion 12 to the other side surface 4 while moving it in a direction away from the one tubular portion 11, the manway reinforcing hardware 10 can be attached to the manway 2, thereby easily reinforcing the manway 2. Furthermore, because the length between the pair of tubular portions 11, 12 can be adjusted by moving one or the other tubular portions 11, 12, the manway reinforcing hardware 10 can be attached by bridging between one side surface 3 and the other side surface 4 of the manway 2 using a similar attachment method, regardless of the size of the manway 2, thereby improving versatility.

[0057] Furthermore, the main body cylindrical portions 11a and 12a are made of single-tube pipes, and the hardware that makes up the other parts, including bolts, nuts, and metal plates, are all commercially available products, so the manhole reinforcement hardware 10 in this embodiment can be manufactured by combining these commonly available products. This eliminates the need to manufacture dedicated parts, thereby reducing manufacturing costs. [Explanation of symbols]

[0058] 1. Rising section 2-person entrance 3 Left side 4 Right side 5 Bottom 6 Internal rebar 10-person entrance reinforcement hardware 11 Cylindrical part 11a Main body cylindrical part 11b First annular plate portion 11c First nut member 11d Second annular plate portion 11e Second bolt member 12 Cylindrical part 12a Main body cylindrical part 12b First annular plate portion 12c First nut member 12d Second annular plate 12e Second bolt member 13 Connection part: first bolt member 13a One end in the longitudinal direction 13b Other end in the longitudinal direction 14 Operation receiving portion: second nut member 15 Fixed part: Insert member 15a Connection 16 Fixed part: Insert member 16a Connection

Claims

1. A manway reinforcing hardware that is installed between one side and the other side of a manway formed in the rising part of a building foundation, a pair of cylindrical portions fixed to the one side surface and the other side surface, respectively; a rod-shaped connecting portion that is bridged between the pair of cylindrical portions and connects the pair of cylindrical portions to each other, one end of the connecting portion in the length direction is inserted into one of the pair of cylindrical portions so as to be able to advance and retreat, and the other end of the connecting portion in the length direction is inserted into the other of the pair of cylindrical portions so as to be able to advance and retreat, The connecting portion is constituted by a first bolt member, The cylindrical portion is A main body cylindrical portion; a first annular plate portion having a hole formed at the center thereof through which the first bolt member is passed, the first annular plate portion being integrally provided at an end portion of the main body cylindrical portion on the first bolt member side; A manway reinforcement hardware characterized by having a first nut member integrally formed on the inner surface of the first annular plate portion and into which the first bolt member is screwed.

2. The reinforcement metal fitting for a pedestrian passage according to claim 1, The housing further includes a pair of fixed portions provided on the one side surface and the other side surface, to which the pair of cylindrical portions are fixed, respectively, The cylindrical portion is A second annular plate portion having a hole formed in the center and integrally provided at the end portion of the main body cylindrical portion on the side surface of the manway; a second bolt member integrally formed on the inner surface of the second annular plate portion, the second bolt member having a tip end protruding from a central hole in the second annular plate portion toward the side surface of the manway; A manway reinforcement hardware characterized in that the fixed part is composed of a cylindrical insert member having a female thread formed inside.

3. The pedestrian entrance reinforcing hardware according to claim 2, A manway reinforcement hardware characterized in that the fixed portion has a connection portion that is connected to the internal reinforcing bars of the rising portion.

4. The reinforcement metal fitting for a pedestrian passage according to claim 1, A manway reinforcement hardware characterized by further comprising an operation receiving portion provided on the first bolt member that receives operations to rotate the first bolt member around its axis.

5. The manway reinforcing hardware according to any one of claims 1 to 4 is attached between the one side surface and the other side surface of the manway, the one cylindrical portion is fixed to the one side surface, the other cylindrical portion is fixed to the other side surface, the connecting portion is bridged between the pair of cylindrical portions and connects the pair of cylindrical portions to each other, A human passage reinforcement structure characterized in that one longitudinal end of the connecting portion is inserted into the interior of one of the cylindrical portions, and the other longitudinal end of the connecting portion is inserted into the interior of the other cylindrical portion, and the one longitudinal end and the other longitudinal end of the connecting portion can move alternately forward and backward into the interior of the pair of cylindrical portions.

6. A method for reinforcing a pedestrian entrance using the pedestrian entrance reinforcement hardware according to any one of claims 1 to 4, a step of fixing the one cylindrical portion, into which the one longitudinal end of the connecting portion is inserted, to the one side surface while moving the one cylindrical portion in a direction away from the other cylindrical portion; a step of fixing the other cylindrical portion, into which the other longitudinal end of the connecting portion has been inserted, to the other side surface while moving the other cylindrical portion in a direction away from the one cylindrical portion.

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