JP6304798B2 - Manhole, connecting metal fitting used therefor, and manhole connecting method - Google Patents

Description

  The present invention relates to a manhole, a connecting metal fitting used therefor, and a method for connecting manholes.

  Manhole construction sites tend to become narrower due to the impact of urbanization. Along with this, assembly manholes are increasingly being constructed in narrow shafts.

  There are mainly 1) adhesive type, 2) plate-tightening type, and 3) bolt-fastening type of assembly manhole joints. Of these, the plate-tightening type with work on the outer surface of the manhole is narrow. It is conceivable to install it inside the manhole due to the difficulty of plate installation in a vertical shaft, but according to this method, it is necessary to embed the plate in the cross section at the time of manufacturing, which increases man-hours, increases costs, and increases the types of products The problem that it must be made arises.

  In order to solve this problem, Patent Document 1 proposes to provide a coupling member including a receiving member provided with an insertion portion for attachment and an insertion plate provided with an insertion portion.

Japanese Patent No. 4674724

  According to the structure proposed in Patent Document 1, it is certainly not necessary to work on the outer surface of the shaft when working on a narrow shaft of an assembly manhole, so it can be adopted as a plate-tightened joint. This makes it possible to suppress an increase in man-hours, an increase in cost, and an increase in product types. However, as described above, since the insertion portion is inserted into the insertion portion of the receiving member, the insertion material is inserted and deformed beyond its elastic value, and the inserted insertion portion is returned to the original state. This is not easy and may cause problems in operability and workability. Moreover, the up-and-down block assembly by the connection metal fitting described in this patent document can be done by one operator in the shaft.

  In view of this point, the present invention adopts a plate-tightening type for manholes, and does not require deformation of parts when connected by a connecting bracket, and in forming a predetermined fixed gap between the upper block and the lower block, man-hours The purpose is to improve the operability and workability by making it possible to form an assembly manhole that can be connected to the outside of the shaft and integrally moved while suppressing an increase in cost, an increase in cost, and an increase in product types.

In the manhole in which the present invention is formed by assembling blocks composed of an upper block and a lower block , and the assembled blocks are connected by a connecting bracket.
Connecting bracket is
A first plate attached to the lower block, and a pair of holding pieces extending in the longitudinal direction of the block and standing in the radial direction of the block from the first plate, and a space portion between the pair of holding pieces The holding piece is formed with an opening that is inclined in the upward direction of the block and in the radial direction of the block , and the opening is a lower metal fitting having a holding member fixing portion, and a second plate attached to the upper block. And a pair of upper metal fittings that are movable in the space, are inclined in the radial direction of the block and upward with respect to the horizontal plane, and are integrally formed on the second plate. Composed of an independently configured holding member that is movably inserted in the opening of
The lower bracket is fixed to the lower block, the upper bracket is fixed to the upper block,
When the second plate is moved downward in the space as the suspended upper block is moved downward, the hooking piece comes into contact with the holding member and the holding member is moved in the opening to move the tip of the hooking piece. The upper block and the lower block are connected or connected by a connecting bracket that can be retracted, reversed, moved in the opposite direction under its own weight, placed on the hook piece, and connected to and fixed to the holding member fixing portion of the opening. Fixed,
The hooked state when the suspended upper block is suspended and placed on the lower block, and the hook when the upper block and the lower block are connected or fixedly connected by the connecting bracket A manhole is provided in which a predetermined gap is formed between one state and the other.

  Further, in the manhole described above, the first plate and the pair of holding pieces are made of a single plate material, the pair of holding pieces are formed by bending from the first plate, Provided is a manhole characterized in that it can move in the vertical direction along the first plate in the space between the pair of holding pieces.

  In addition, the present invention provides a manhole characterized in that, in the manhole described above, the holding member fixing portion is formed as a holding member fixing hole portion of the opening portion above the opening portion.

  The present invention also provides a manhole characterized in that, in the manhole described above, the holding member is formed in a bolt-nut configuration and is detachable.

Further, the present invention is used for the above-described manhole, and includes the above-described lower metal fitting and the upper metal fitting . The hook piece abuts on the holding member between the upper block and the lower block, and the holding member is engaged with the tip of the hook piece. The connecting metal fitting is characterized in that a space required to be retracted, inverted, moved in the reverse direction by its own weight, and placed on the hooking piece is provided.

  Further, according to the present invention, in the connection fitting described above, the first plate and the pair of holding pieces are formed of a single plate material, the pair of holding pieces are formed by bending from the first plate, A connecting bracket is provided that is movable in the vertical direction along the first plate in the space between the pair of holding pieces.

  According to another aspect of the present invention, there is provided the connecting fitting, wherein the holding member fixing hole is formed as a holding member fixing hole at a part of the opening at an upper portion of the opening. .

Further, the present invention is formed by assembling blocks composed of an upper block and a lower block , and the assembled blocks are connected by a connecting metal fitting,
A first plate attached to the lower block, and a pair of holding pieces extending in the longitudinal direction of the block and standing in the radial direction of the block from the first plate, and a space portion between the pair of holding pieces The holding piece is formed with an opening that is inclined in the upward direction of the block and in the radial direction of the block, and the opening is attached to the lower metal fitting having the holding member fixing portion and the upper block. a plate, capable of moving the space portion, and inclined upward with respect to the horizontal plane a radial block, the upper bracket and is configured to have integrally hooking and pieces of shape, to the second plate In a method for connecting manholes, which is composed of an independently configured holding member that is movably inserted in a pair of openings ,
Fix the lower bracket to the lower block, the upper bracket to the upper block,
Along with the downward movement of the suspended upper block, the second plate is moved downward in the space, the hooking piece is brought into contact with the holding member, the holding member is moved in the opening, and the tip of the hooking piece is moved. The upper block and the lower block are connected or connected by a connecting bracket that can be retracted, inverted, moved in the opposite direction under its own weight, placed on the hook piece, and connected to and fixed to the holding member fixing portion of the opening. Fixed,
The hooked state when the suspended upper block is suspended and placed on the lower block, and the hook when the upper block and the lower block are connected or fixedly connected by the connecting bracket Provided is a manhole connection method characterized by forming a predetermined gap between one state and the other.

  In the present invention, as described above, when the second plate is moved downward in the space portion with the downward movement of the upper block, the inclined inclined surface of the hooking piece comes into contact with the holding member, When the second plate is moved upward by moving the inside of the opening and retracting it more than the inclined surface, inverting it, moving it in the reverse direction by its own weight, and placing it on the hook piece, the second plate is moved to the holding member and holding member. Since it is fixed to the first plate via the fixing portion and the upper block and the lower block are connected to each other by the connecting metal fitting, a bending deformation action is not generated on the connecting member constituting the connecting metal fitting, Therefore, the operation beyond the elastic region is not performed, and the adjacent upper and lower blocks can be connected by the vertical movement operation of the second plate. Then, in forming a predetermined fixed gap between the upper block and the lower block, the operability from the outer surface of the shaft and the workability are improved while suppressing an increase in man-hours, an increase in cost, and an increase in product types. I can do it.

The schematic of the manhole which is an Example of this invention. The figure which shows the form of the Example of this invention. The perspective view which shows the form of the partial product of the connection metal fitting used for the Example of this invention. The perspective view which shows the form of the partial product of the connection metal fitting used for the Example of this invention. The perspective view which shows the form of the partial product of the connection metal fitting used for the Example of this invention. The figure which shows the operation process of the Example of this invention. The figure which shows the operation process of the Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing an outline of a manhole that is an embodiment of the present invention.

  In FIG. 1, a manhole 100 according to an embodiment of the present invention includes several blocks, in this example, upper blocks 1 and 2 and a lower block 3, and includes an upper block 1 and an upper block 2, and an upper block 2 and a lower block. The side blocks 3 are stacked and configured to engage with each other as shown in FIG. In this example, the upper block 2 is selected from the upper blocks 2 and the combination with the lower block 3 will be described. However, the present invention can also be used for connection between other blocks. Normally, the upper block 1 is configured as a slant wall block, and the upper blocks 1 and 2 are configured as straight wall blocks. A bottom plate block 4 is connected to the lower block 3.

  Connecting metal fittings 10 are attached between the upper block 1 and the upper block 2 and between the upper block 2 and the lower block 3. A connecting metal fitting 10 may be provided between the lower block 3 and the bottom block 4.

  The manhole 100 configured as described above is disposed in the shaft 6. This shaft 6 has become narrow.

  In this embodiment, in FIG. 1, the vertical direction is called the longitudinal direction of the manhole 100, and the horizontal direction is called the radial direction.

  FIG. 2 shows a method of connecting the upper and lower blocks using the connecting fitting 10. The lower metal fitting 11 and the upper metal fitting 12 are arranged in the vertical direction, that is, the longitudinal direction of the manhole, fixed to the lower block 3 and the upper block 2, respectively, and assembled by moving the upper block 2.

  3 to 5 show components that are components of the connecting metal fitting 10. FIG. 2A shows the front of the connection fitting 10, and FIG. 2B shows the side of the connection fitting 10.

  In these drawings, the connecting metal fitting 10 includes a lower metal fitting 11, an upper metal fitting 12, and a holding member 13. In order to facilitate understanding, the lower metal fitting 11 will be described.

As shown in FIG. 3, the lower metal fitting 11 is composed of a first plate 15 that is an elongated rectangular first plate and a pair of holding pieces 16 that stand from the first plate 15. In the case of this example, the pair of holding pieces 16 stand upright from the first plate 15. Conversely, it may be expressed as being inverted. The first plate 15 and the pair of holding pieces 16 are formed by processing one plate material. The pair of holding pieces 16 stands upright from the right side of the first plate 15, and a notch 17 is formed at the tip of the first plate. The cutout portion 17 allows the upper block 2 suspended as described later to swing in the lateral direction.

  A space portion 24 is formed between the pair of holding pieces 16, and this space portion 24 serves as a moving space for the holding member 13 disposed here. The pair of holding pieces 16 is formed with a heart-shaped opening 18 at the center thereof. The heart-shaped opening 18 is provided with a base hole 19 of the heart base, an inclination formed from the base hole 9 slightly downward in the horizontal direction, and a moving hole 20 of the heart part and It is formed from the holding member fixing hole 21 of the other heart part, which is slightly inclined from the base hole part 19 with respect to the vertical direction. The heart-shaped opening 18 is formed by punching a plate. Since the holding member 13 is made of a circular material, the end of the moving hole 17 and the end of the holding member fixing hole 21 are circular. Further, the base hole portion 19 is also circular, and forms a heart shape in which the hole shapes are aggregated comprehensively.

  The cutout portion 17 has a cross section and covers the entire opening 18 and is cut in the vertical direction.

  The holding member fixing hole 21 is formed in a direction perpendicular to the moving hole 20.

The first plate 15 and the pair of holding pieces 16 are made of a single plate material, and the pair of holding pieces 16 are formed by being bent at right angles from the first plate 15. Although it does not have to be a right angle, it is preferably a right angle in terms of arrangement. The second plate 31 can move up and down in the space 24 along the first plate 15. In this case, since the notch 17 is formed, the second plate 31 can be moved also in the radial direction.

Bolt holes 22 are formed in the lower end portion of the first plate 15. The bolt 23 is inserted into the bolt holes 22, the lower bracket 11 by inserting the bolt hole 22 provided in the lower block 3 is fixed to the lower block 3 is mounted.

FIG. 4 is a perspective view showing a form of a partial product of the connecting metal fitting.
In FIG. 4, the upper metal fitting 12 is composed of a rectangular plate-like second plate 31, and the second plate 31 is bent at a right angle or more at the tip. This bent portion becomes a hook piece (which may be expressed as a hook portion) 34 having an inclined surface inclined upward with respect to a horizontal plane. The hook piece 34 has a function of hooking and holding the holding member 13. The term “hook” means that the holding member 13 is placed in a hooked state, and if the stationary state is observed, it can also be called a holding member fixing placement portion. Upper side member 12 is configured to include a hook piece 34 bent therefrom folding the second plate 31. The upper end portion of the second plate 31 Yes and bolt hole 37 is formed, a bolt 35, is inserted into the bolt holes 22, the upper side member 12 upward by inserting the bolt hole 37 provided in the upper block 2 It can be fixedly attached to the block 2.

The second plate 31 has a width slightly narrower than the first plate 15, second plate 31 first becomes movable on the plate 15. That is, the upper metal fitting 12 can be moved in the longitudinal direction in the space 24 formed between the pair of holding pieces 16. In this case, as described above, the inside of the cutout portion 17 can also be moved in the radial direction. Therefore, when the second plate 31 can secure a sufficient space portion in the radial direction, or when the length of the hook portion is shortened, it is not necessary to provide the notch portion 17. By providing the cutout portion 17, the connecting metal fitting 10 can be reduced in size as a whole.

  FIG. 5 shows the shape of the holding member 13. The holding member 13 has a feature that it is composed of a central part 41 and an end part 42 having a circular cross section and is an independent body. The end portion 42 has an outer shape slightly larger than that of the central portion 41 and is sized so as not to be detached from the opening portion 18 when the holding member 13 is inserted into the opening portion 18. One of the ends is removable. The holding member 13 is typically configured with a bolt-nut configuration. The bolt forms the central portion, and the bolt head and nut are the end portions. Since the nut is removable, the holding member 13 can be removed from the opening 18.

  The connection fitting 10 includes a first plate attached to the lower block as described above, and a pair of holding pieces extending in the longitudinal direction of the block and standing in the radial direction of the block from the first plate. A space portion is formed between the holding pieces, an opening portion that is inclined upward and radially is formed in the holding piece, the opening portion is provided with a holding member fixing portion, and the holding portion is movable within the pair of opening portions. A lower metal fitting configured by inserting a member, a second plate attached to the upper block, and an inclined surface that is movable in the space and is inclined in the radial direction of the block and upward with respect to a horizontal plane And an upper metal fitting configured to have a hook piece integral with the second plate.

  FIG. 2 shows a state in which the upper block 2 and the lower block 3 are connected by the connecting metal fitting 10. FIG. 2A shows the front, and FIG. 6B shows the side.

As shown in FIG. 2, the upper metal fitting 12 and the lower metal fitting 11 of the connecting metal fitting 10 are fixedly installed between the adjacent upper block 2 and lower block 3. With this arrangement, the heart-shaped opening 18 is arranged slightly upward with respect to the horizontal direction. This corresponds to the inclination of the hook piece 34.

The lower block 3 is fixed at a predetermined position in the shaft 6. The upper block 2 is suspended by a crane or the like as normally used, and is positioned so that the upper metal fitting 12 is positioned above the lower metal fitting.

FIG. 2 is a diagram illustrating that the upper block 2 and the lower block 3 are assembled and formed to form a connection state between the upper block 2 and the lower block 3 by the connection fitting 10 before being engaged with each other. . A conventional structure may be adopted as the stacked structure. In this state, the connecting metal fitting 10 is in an idle state, and the upper metal fitting 12 is not connected to the lower metal fitting 11. That is, the upper block 2 is suspended and is in a state in which the upper block 2 can be moved in the vertical direction and the radial direction.

  In FIG. 2 (b), the holding member 13 is disposed in the base hole portion 19 of the opening 18 so as to penetrate therethrough. The holding member 13 has, for example, a bolt-nut configuration, and does not come out of the opening 18 by tightening the nut. The holding member 13 is slidable from the base hole part 19 to both the moving hole part 20 and the holding member fixing hole part 21, and the functions of the base hole part 19 and the moving hole part 20 are used when the upper and lower manholes are connected. The

The plate 31, which is the second plate, is moved downward in the space 24, and the hooking piece 34 is arranged above the opening 18.
The connection between the upper metal fitting 12 and the lower metal fitting 11 is the first and second two of the contact between the upper metal fitting 12 and the lower metal fitting 11, the retracting / reversing of the holding portion 13 and the self-weight return / mounting. It consists of two steps, and the connection and fixing are done through a third step.

The upper metal fitting 12 is moved while adjusting the position from the upper side to the lower side, and the hook piece 34 is brought into the space 24. As the upper block 3 moves downward and swings in the radial direction using the notch 17, the inclined lower surface or tip of the hook piece 34 comes into contact with the side surface of the holding member 13 (first step). Since the hooking piece 34 formed on the second plate is inclined slightly upward from the horizontal direction, the hooking piece 34 that comes into contact with the hooking piece 34 has a lateral movement force, that is, a rightward lateral movement force (lateral direction). Force) is generated, and this force moves the holding member 13 to the right in the moving hole portion 20 slightly inclined with respect to the horizontal direction, and moves the holding member 13 to the tip end position of the hook piece 34. That is, it is evacuated. When the inclination of the hook piece 34 is increased, the retracting operation of the holding member 13 can be facilitated.

The holding member 13 is retracted to the front end of the hook piece, and when the tip is exceeded, the front end of the hook piece is positioned below the holding member 13 and the holding member 13 is inverted by its own weight from this arrangement configuration. Thus, the tip of the hook piece is positioned below the holding member, and the holding member 13 returns to the base hole portion 19 by its own weight and is placed on the hook piece 34 ( second step). ).

  In this example, the upper metal member 12 has an inclined surface formed from a single plate material, but is rounded to the lower surface of the hook portion 34 in order to generate a lateral force due to the contact of the hook piece 34 with the holding member 13. Lateral force can be generated even if processing such as attaching. In addition, a lubricant can be applied to facilitate the movement of the holding member 13. The holding member 13 can return the moving hole to the original direction by its own weight. Although it is possible to apply a special force to return the holding member 13 to the original position, in the case of this example, it can be returned to the original without providing a mechanism that applies the special force. There is no need to provide a mechanism.

As described above, when the second plate 31 is moved downward in the space portion 24, the inclined surface which is the lower surface of the hooking piece 34 comes into contact with the holding member to move the holding member and the moving hole portion in the opening. Evacuate. Subsequent to the reversal, inversion is performed, thereby forming the second-step mounting state shown in FIG. The connection is made in the second step.

  When the upper plate 2 is moved upward in this state and the second plate is moved upward, the hooking piece 34 fixes the holding member 13 to the holding member holding hole (third step). As a result, the upper metal fitting 12 and the lower metal fitting 11 are connected and fixed. That is, the upper block 2 and the lower block 3 are connected and fixed.

  The connecting fittings 10 are provided on both sides of the upper and lower blocks and are connected almost simultaneously, but it is not necessary to connect the upper fitting 12 and the lower fitting 11 at the same time. The connection between one upper metal fitting 12 and the lower metal fitting 11 is completed, and in this state, the notched portion 17 is provided, so that the suspended upper block is slightly swung, and the other side hook piece Can be engaged with the holding member 13. In this connection, since the work is performed outside the shaft 6, the worker can adjust the holding member 13 so that the connection is reliably performed. It can also be connected in the shaft.

  When the connection of the upper metal fitting to the lower metal fitting is completed in this way and the engagement between the upper block 2 and the lower block 3 is completed, it can withstand level 2 earthquake motion due to the combination of both blocks shown below. Connected joint structure.

  According to the present embodiment, when work in the shaft is required, it is possible to perform the joining work without entering the narrow work area between the manhole and the shaft, It is also possible to make sure that one worker enters what has been entered, and that the hook piece and the holding member are connected reliably and quickly. According to the present embodiment, even one operator can sufficiently recognize the connection state by the connection fitting and the predetermined gap generated in the holding member 13 and the hook piece 34.

  When the upper block and the lower block are connected, the suspended upper block 2 is suspended and fixed to the lower block 3, and the hooking piece 34 is separated from the holding member 13. A predetermined gap is formed between the state of the hook piece 34 at the time and the state of the hook piece 34 when the holding member 13 as an independent body is connected and fixed between the upper block 2 and the lower block 3. Relationship. Since the positional relationship in the relationship between the state where the hooking piece 34 and the holding member 13 are connected and the state where the holding member 13 is connected and fixed is constant, the above-described predetermined gap is the same as that when the upper block is fixed to the lower block 3. The relationship between the state and the hook piece and the holding member 13 in the connected state can be rephrased as a predetermined gap.

FIG. 6 shows a manhole 100 joined to withstand level 2 seismic motion. The upper block 2 is fixed on the lower block 3 from the state of the third step shown in FIG. In this state, since the upper metal fitting 12 and the lower metal fitting 11 are connected, the starting points 50 of the assembly grooves provided in the upper block 2 and the lower block 3 are in the same state, and the upper block 2 The lower block 3 is meshed and stacked.

  At this time, a predetermined interval is held between the hook piece 34 and the holding member 13. This interval is a distance at which the joints of the upper and lower blocks can be separated by a predetermined distance when an earthquake of a predetermined level occurs, so that the fixed hook piece 34 and the holding member 13 are not separated from each other. It will be connected and engaged. As described above, the holding member 13 is fixed to the opening portion 19 and has a stopper function, and the opening amount of the joint at the block joint portion can be set to a range in which there is no inflow of earth and sand that impedes the flow-through function. And the connection joining structure which can endure the earthquake motion of the predetermined level using the holding member 13 as an independent body is provided.

  From the state of the third step shown in FIG. 2, a joined state in which the upper block 2 and the lower block 3 are connected can be formed.

  FIG. 7 shows the joined state in which the connection and the connection are fixed.

  When the upper block 2 is moved upward from the state of the third step shown in FIG. 2 or from the state shown in FIG. 6, the state shown in FIG. 7 is formed. When the plate 31 is moved upward, it is possible to form a fixed state in which the holding member 13 is fixed to the holding member fixing hole 21 in a state where the hooking piece 34 is placed. That is, a connected and fixed state can be formed. The first plate 15 and the second plate 31 are fixedly coupled to each other by holding the holding member 13 by the hooking piece 34 and fixing engagement of the holding member 13 with the fixing member holding hole 21. As a result, the upper metal fitting 12 is held on the lower metal fitting 11 via the holding member 13, so that the upper metal fitting 12 is pulled upward along with the movement of the upper block 2, so A state in which the side block 3 is connected and fixed by the connecting fitting 10 is formed. Thus, FIG. 7B also shows a state where the upper and lower blocks are connected and fixed.

  As described above, this embodiment provides a manhole connecting method including the following three steps.

A first plate attached to the lower block, and a pair of holding pieces extending in the longitudinal direction of the block and standing in the radial direction of the block from the first plate, and a space portion between the pair of holding pieces The holding piece is formed with an opening that is inclined upward and in the radial direction, and the opening includes a holding member fixing portion that is a holding member fixing hole, and can be moved independently in the pair of openings. The lower metal fitting formed by inserting the holding member, the second plate attached to the upper block, and movable in the space, and inclined in the radial direction of the block and upward with respect to the horizontal plane And the connection metal fitting comprised from the upper metal fitting comprised and having the hook-shaped piece of integral shape in the 2nd plate is used.
The lower metal fitting is fixed to the lower block, and the upper metal fitting is fixed to the upper block.

  When the second plate is moved downward in the space as the suspended upper block is moved downward, the hooking piece comes into contact with the holding member and the holding member is moved in the opening to move the tip of the hooking piece. The upper block and the lower block are connected or connected by a connecting fitting that can be retracted, reversed, moved in the opposite direction under its own weight, placed on the hook piece, and held in a fixed state on the holding member fixing portion of the opening. Fixed.

  When this connected state is formed and the suspended upper block is suspended and fixed to the lower block, the hooked piece state and the upper block and the lower block are connected by a connecting metal fitting or connected A predetermined gap is formed between the hooked piece state when it is fixed.

  With the upper bracket moved and connected to the lower block, the hook piece and the holding member are arranged at a predetermined interval to prevent the upper block and lower block from separating when there is earthquake motion. Therefore, it is not necessary to cause the plastic bending deformation action to occur in the members constituting the connecting bracket, and therefore, the operation in the plastic state is not performed beyond the elastic region. Since both of them can be connected by swinging the direction, a plate-tightened type is adopted for the manhole, which increases man-hours and costs when forming a fixed gap between the upper and lower manholes. The operability and workability from the outer surface of the shaft can be improved while suppressing an increase in product types.

DESCRIPTION OF SYMBOLS 1, 2 ... Upper block, 3 ... Lower block, 6 ... Vertical shaft, 10 ... Connecting metal fitting, 11 ... Lower metal fitting, 12 ... Upper metal fitting, 13 ... Holding member, 15 ... First plate , 16 ... A pair of holding pieces , 18 ... opening, 19 ... base hole part, 20 ... moving part, 21 ... holding member fixing hole part, 31 ... second plate , 34 ... hook piece (hook part), 50 ... starting point of assembly groove, 100 ... manhole.

Claims (8)

In the manhole, which is formed by building blocks and the assembled blocks are connected by connecting metal fittings,
Connecting bracket is
A first plate attached to the lower block, and a pair of holding pieces extending in the longitudinal direction of the block and standing in the radial direction of the block from the first plate, and a space portion between the pair of holding pieces The holding piece is formed with an opening that is inclined in the upward direction of the block and in the radial direction of the block , and the opening is a lower metal fitting having a holding member fixing portion, and a second plate attached to the upper block. And a pair of upper metal fittings that are movable in the space, are inclined in the radial direction of the block and upward with respect to the horizontal plane, and are integrally formed on the second plate. Composed of an independently configured holding member that is movably inserted in the opening of
The lower bracket is fixed to the lower block, the upper bracket is fixed to the upper block,
When the second plate is moved downward in the space as the suspended upper block is moved downward, the hooking piece comes into contact with the holding member and the holding member is moved in the opening to move the tip of the hooking piece. The upper block and the lower block are connected or connected by a connecting bracket that can be retracted, reversed, moved in the opposite direction under its own weight, placed on the hook piece, and connected to and fixed to the holding member fixing portion of the opening. Fixed,
The hooked state when the suspended upper block is suspended and placed on the lower block, and the hook when the upper block and the lower block are connected or fixedly connected by the connecting bracket A manhole characterized in that a predetermined gap is formed between one state and the other.   The manhole according to claim 1, wherein the first plate and the pair of holding pieces are made of a single plate material, the pair of holding pieces are formed by bending from the first plate, and the second plate is a pair of holding pieces. A manhole that is movable in the vertical direction along the first plate in the space between the holding pieces.   2. The manhole according to claim 1, wherein the holding member fixing part is formed as a holding member fixing hole part of the opening part above the opening part.   2. The manhole according to claim 1, wherein the holding member is formed in a bolt and nut configuration and is detachable. It is used for the manhole according to any one of claims 1 to 4, and is composed of the lower metal fitting and the upper metal fitting described above. Between the upper block and the lower block, a hook piece abuts on the holding member, A connecting bracket characterized in that a space required to be retracted at the tip of the hook piece, inverted, moved in the reverse direction by its own weight, and placed on the hook piece is formed .   6. The connecting bracket according to claim 5, wherein the first plate and the pair of holding pieces are made of a single plate material, the pair of holding pieces are formed by bending from the first plate, and the second plate is a pair of holding plates. A connecting bracket that is movable in the vertical direction along the first plate in the space between the holding pieces.   6. The connecting metal fitting according to claim 5, wherein the holding member fixing hole is formed as a holding member fixing hole at a part of the opening at an upper portion of the opening. It is formed by stacking blocks, and the stacked blocks are connected with connecting brackets,
A first plate attached to the lower block, and a pair of holding pieces extending in the longitudinal direction of the block and standing in the radial direction of the block from the first plate, and a space portion between the pair of holding pieces The holding piece is formed with an opening that is inclined in the upward direction of the block and in the radial direction of the block, and the opening is attached to the lower metal fitting having the holding member fixing portion and the upper block. a plate, capable of moving the space portion, and inclined upward with respect to the horizontal plane a radial block, the upper bracket and is configured to have integrally hooking and pieces of shape, to the second plate In a method for connecting manholes, which is composed of an independently configured holding member that is movably inserted in a pair of openings ,
Fix the lower bracket to the lower block, the upper bracket to the upper block,
Along with the downward movement of the suspended upper block, the second plate is moved downward in the space, the hooking piece is brought into contact with the holding member, the holding member is moved in the opening, and the tip of the hooking piece is moved. The upper block and the lower block are connected or connected by a connecting bracket that can be retracted, inverted, moved in the opposite direction under its own weight, placed on the hook piece, and connected to and fixed to the holding member fixing portion of the opening. Fixed,
The hooked state when the suspended upper block is suspended and placed on the lower block, and the hook when the upper block and the lower block are connected or fixedly connected by the connecting bracket A method for connecting manholes, wherein a predetermined gap is formed between one state and the other.

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