JP5160271B2 - Housing for underground structures - Google Patents

Description

  The present invention relates to a housing for an underground structure that includes an outer cylinder that is fixedly installed, and an inner cylinder that is open up and down and whose upper opening is closed by a lid.

  A casing is installed on the gate valve so that a gate valve such as a water pipe buried in the ground can be operated from the ground. The upper end of the housing opens at the same height as the ground, and the opening is closed by a lid. When working, the lid is opened and the gate valve is operated from the ground.

Conventionally, in order to make it easy to match the upper end position of the casing to the same height position as the ground, a screw-type casing including an outer cylinder and an inner cylinder has been used. The outer cylinder is fixedly installed on a driver provided in the ground, the inner cylinder opens up and down, and the upper opening is closed by a lid. In this screw-type housing, it is necessary to align the opening above the inner cylindrical body at the same height position as the ground, and a screwing structure is provided on the outer peripheral surface of the inner cylindrical body and the inner peripheral surface of the outer cylindrical body. . By this screwing structure, the inner cylinder is moved up and down along the inner peripheral surface of the outer cylinder fixedly installed by rotating the inner cylinder in the circumferential direction. When the inner cylinder is rotated and the position of the opening above it coincides with the same height position as the ground, it is necessary to fix the inner cylinder so that the inner cylinder does not rotate. Therefore, a fixing claw is provided inside the inner cylinder, and a through hole is provided in the inner cylinder, and a tip end portion of the fixing claw is projected from the inside of the inner cylinder through the through hole to the outer cylinder. The proposal which fixes to an outer cylinder body is made | formed (refer patent document 1). In this proposal, as a screwing structure, a female screw part is provided on the inner peripheral surface of the outer cylindrical body and a male screw part is provided on the outer peripheral surface of the inner cylindrical body. The inner cylindrical body is fixed to the outer cylindrical body by sandwiching the female thread portion of the outer cylindrical body with the tip portion. The fixed claw has a horizontal rotation fulcrum on the inner side of the inner cylinder, and the fixed claw is more than the outer peripheral surface of the inner cylinder so that the tip part does not protrude when adjusting the height position of the inner cylinder. It is stored inside. When the inner cylinder is fixed to the outer cylinder, the fixing claw is rotated in the horizontal direction, and the tip end portion of the inner cylinder projects through the through hole to the outer cylinder side. For this reason, the through hole is greatly opened in the circumferential direction of the inner cylinder so that the tip of the fixed claw that rotates in the horizontal direction can pass through. In addition, in order to sandwich the female threaded portion of the outer cylindrical body between the male threaded portion of the inner cylindrical body and the tip of the fixed claw, the vertical position of the fixed claw must be adjusted, Are provided with bolts extending in the vertical direction. The fixed claw rotates in the horizontal direction by operating the bolt, and the position of the fixed claw is adjusted by operating the bolt when adjusting the position in the vertical direction. The through-hole provided in the inner cylinder is a hole having a margin in the vertical direction so as not to hinder the vertical adjustment of the fixed claw.
Japanese Patent No. 3515090

  By the way, the upper end of the inner cylinder is at the same height as the ground, but the upper end of the outer cylinder fixedly installed on the drive unit is in the ground. For this reason, sand easily enters between the inner cylindrical body and the outer cylindrical body from the upper end of the outer cylindrical body, and the sand that has entered therebetween gradually moves downward through the screwing structure. In the case described in Patent Document 1, since the through hole is a hole having a large opening in the circumferential direction and having a margin in the vertical direction as described above, the sand that has moved downward through the screwed structure is And flows into the inner cylinder from the through hole. If the sand that has flowed into the inner cylinder is caught in the screw groove of the bolt, the bolt cannot be operated, and there is a possibility that horizontal rotation and vertical position adjustment cannot be performed. Even after the housing is once installed in the ground with the position of the upper opening in the inner cylinder aligned with the same height as the ground, the height position of the opening in the inner cylinder due to ground subsidence, ground re-paving, etc. May need to be changed. When changing the height position of the inner cylinder, if the sand is caught in the screw groove of the bolt and the bolt cannot be operated, the height position of the inner cylinder cannot be changed. Moreover, it takes time and effort to manufacture an inner cylinder having a through hole.

  In view of the above circumstances, the present invention provides a housing for an underground structure that includes an inner cylinder that can be easily manufactured, and that reduces the possibility that the height position of the inner cylinder cannot be changed. It is intended to do.

A first underground structure housing of the present invention that solves the above-described object includes an outer cylinder that is fixedly installed, and an underground cylinder that is open up and down and whose upper opening is closed by a lid. In the housing for structures,
A screwing structure in which the inner cylinder moves up and down along the inner peripheral surface of the outer cylinder by rotating the inner cylinder in the circumferential direction has an outer peripheral surface of the inner cylinder and an inner periphery of the outer cylinder. Provided on the surface,
The underground structure housing further includes a fixing claw that contacts the outer cylinder below the inner cylinder and prevents the inner cylinder from rotating in the circumferential direction.

  Here, the fixed claw may be in contact with the outer cylinder body with a strong frictional force, or may be engaged with the outer cylinder body in the circumferential direction by contacting the outer cylinder body. It may be a thing.

  According to the first housing for an underground structure of the present invention, the fixed claw for preventing the inner cylinder from rotating in the circumferential direction contacts the outer cylinder below the inner cylinder. For this reason, it is not necessary to provide a through hole in the inner cylinder. Further, in the first underground structure housing, the fixed claw is not limited to the one that comes into contact with the outer cylinder body by the operation of the bolt, but if the fixed claw is such In addition, it is possible to reduce sand trapped in the screw groove of the bolt. That is, it contacts the outer cylinder below the through hole of the inner cylinder described in Patent Document 1. For this reason, the distance until the sand that gradually moves downward through the screwed structure reaches the bolt that operates the fixed claw is less than the underground structure casing described in Patent Document 1. However, since the underground structure casing of the present invention is longer and requires a considerable amount of time, sand is less likely to reach the first underground structure casing. Therefore, the possibility that the height position of the inner cylinder cannot be changed is reduced. And since it is not necessary to provide a through-hole in the said inner cylinder, the manufacture of the inner cylinder is easy.

  In the first underground structure housing according to the present invention, a plurality of the fixing claws are provided toward the outer cylinder body at intervals in the circumferential direction of the outer cylinder body. It is preferable that the upper surface of the is in contact with the outer cylinder.

  By carrying out like this, the said fixed nail | claw can contact the outer cylinder body in the several places in the circumferential direction of the said outer cylinder body, and it can suppress that the said inner cylinder body rattles in a horizontal direction.

  Here, it is preferable that the fixed claw is separate from the inner cylinder.

  By making the fixed claw separate, the inner cylinder can be manufactured more easily.

  In the first underground structural housing of the present invention, it is more preferable that the fixed claw is rotated in the circumferential direction of the outer cylinder separately from the inner cylinder.

  If the fixed claw rotates together with the inner cylinder, the position of the fixed claw is largely restricted by the circumferential rotation position of the inner cylinder. For this reason, when the position of the fixed claw that is in contact with the outer cylinder is set to a predetermined position, the inner cylinder is rotated to adjust the position of the fixed claw to the predetermined position. The height position of the inner cylinder may have to be shifted considerably. However, if the fixed claw is rotated in a manner separate from the inner cylinder, the position of the fixed claw may be slightly restricted by the circumferential rotation position of the inner cylinder. The height position of the inner cylinder can be finely adjusted.

Further, in the first underground structure housing of the present invention, the casing is disposed inside the inner cylindrical body, and includes a ring body that rotates in the circumferential direction of the outer cylindrical body separately from the inner cylindrical body,
A plurality of the fixing claws are provided at intervals in the circumferential direction of the ring body,
It is more preferable that the ring body is engaged with the inner cylindrical body by changing its position stepwise in the circumferential direction at a pitch narrower than a circumferential interval provided with the fixing claws.

  According to this aspect, the ring body provided with the fixing claw engages with the inner cylinder body without interfering with fine adjustment of the height position of the inner cylinder body, and the ring body and the inner cylinder body are relative to each other. In the circumferential direction is surely prevented.

The second case for the underground structure of the present invention that solves the above-described object comprises an outer cylinder body that is fixedly installed and an inner cylinder body that is open up and down and whose upper opening is closed by a lid body. In the housing for structures,
A screwing structure in which the inner cylinder moves up and down along the inner peripheral surface of the outer cylinder by rotating the inner cylinder in the circumferential direction has an outer peripheral surface of the inner cylinder and an inner periphery of the outer cylinder. Provided on the surface,
This underground structure casing is further arranged inside the inner cylinder, and separately from the inner cylinder, a ring body that rotates in the circumferential direction of the outer cylinder,
A fixing claw provided on the ring body and in contact with the outer cylinder body to prevent rotation of the inner cylinder body in the circumferential direction is provided.

  According to the second casing for an underground structure of the present invention, the ring body is separate from the inner cylindrical body, and the manufacturing of the inner cylindrical body becomes easy. Further, since the ring body is a separate body, the degree of freedom in design increases, and the possibility that the height position of the inner cylinder cannot be changed can be reduced. Furthermore, since the ring body provided with the fixed claw rotates separately from the inner cylinder, the position of the fixed claw may be somewhat restrained by the circumferential rotation position of the inner cylinder. Even if it exists, it is not restrained greatly, and the height position of the inner cylinder can be finely adjusted.

Further, in this second underground structure housing, a plurality of the fixing claws are provided at intervals in the circumferential direction of the ring body,
It is preferable that the ring body is engaged with the inner cylindrical body by changing its position stepwise in the circumferential direction at a pitch narrower than a circumferential interval provided with the fixing claws.

According to the second method of adjusting the height position of the housing for an underground structure of the present invention, the inner cylinder is rotated by rotating the inner cylinder that opens up and down and the upper opening is closed by the lid in the circumferential direction. In a method for adjusting the height position of a casing for an underground structure in which a screwing structure in which an elevating and lowering along the inner peripheral surface of the outer cylindrical body is provided on the outer peripheral surface of the inner cylindrical body and the inner peripheral surface of the outer cylindrical body ,
An outer cylinder fixing step for fixing and installing the outer cylinder;
On the inside of the inner cylinder, a ring body installation step of installing a ring body that rotates in the circumferential direction of the outer cylinder separately from the inner cylinder,
A height position adjusting step of rotating the inner cylinder and adjusting the height position of the inner cylinder;
A ring body positioning step for positioning the ring body with respect to the circumferential direction of the outer cylinder inside the inner cylinder,
A fixing claw attaching step of attaching to the ring body a fixing claw that is in contact with the outer cylinder and prevents rotation of the inner cylinder in the circumferential direction.

  Here, when the fixing claw is attached to the ring body in the fixing claw attaching step, the fixing claw may be in contact with the outer cylindrical body, but a separate inner cylinder fixing step is provided. Then, the fixing claw may be brought into contact with the outer cylinder so as to prevent the rotation of the inner cylinder in the circumferential direction.

Further, in the height position adjusting method of the underground structure casing, the outer cylindrical body fixing step is a step of fixing and installing the outer cylindrical body in which the concave portion recessed outward is provided on the inner peripheral surface,
The ring body installation step is a step of installing the ring body to which the second fixed claw whose tip portion is located on the inner side of the concave portion is attached inside the inner cylindrical body,
It is preferable that the fixing claw attaching step is a step of inserting the tip end portion of the fixing claw into the concave portion of the outer peripheral cylinder and attaching the fixing claw in a state where the tip portion is inserted into the concave portion to the ring body.

  Here, an inner cylinder fixing step may be provided, and in this step, the fixing claw may be brought into contact with the outer cylinder and the second fixing claw may be brought into contact with the outer cylinder.

Further, in this height structure adjusting method of the housing for underground structures, the outer cylinder fixing step includes an outer cylinder in which a plurality of concave portions recessed outward are provided at intervals in the circumferential direction of the inner peripheral surface. Fixed installation process,
In the ring body positioning step, the ring body is shifted in the circumferential direction at a pitch narrower than the circumferential interval provided with the recesses, and the ring body is engaged with the inner cylindrical body, thereby It is also preferable to be a step of positioning.

  According to the present invention, there is provided a housing for an underground structure that includes an inner cylinder that can be easily manufactured and greatly reduces the possibility that the height position of the inner cylinder cannot be changed. can do.

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

  FIG. 1 is a perspective view of a screw type gate valve housing which is an embodiment of the underground structure housing of the present invention, and FIG. 2 is a cross-sectional view of the screw type gate valve housing shown in FIG.

  A screw type gate valve housing 1 shown in FIG. 1 is a double cylinder structure having an outer cylinder body 10 and an inner cylinder body 20, and is installed in the ground. Both the outer cylinder 10 and the inner cylinder 20 are made of cast iron. The outer cylinder body 10 is fixedly installed on a housing (not shown) with bolts. The outer cylinder 10 has a lower flange 11, and fixing holes 111 through which bolts are passed at equal intervals along the circumferential direction when bolted to the housing. In addition, on the outer peripheral surface 101 of the outer cylindrical body 10, six overhanging portions 12 are provided at intervals of 60 ° in the circumferential direction.

  As shown in FIG. 2, the inner cylinder 20 has openings 20 a and 20 b on the upper and lower sides, and the upper opening 20 a is closed by the lid body 9. The screw type gate valve housing 1 shown in FIG. 1 is installed on a gate valve (not shown) such as a water pipe buried in the ground. When operating the gate valve, the lid body 9 is opened. Operate the gate valve. Further, in the screw type gate valve housing 1, in order to align the upper surface 91 of the lid body 9 with the same height position as the ground, the inner cylinder body so that the opening 20a above the inner cylinder body 20 is at the same height position as the ground. Twenty height position adjustments are made. In the screw-type gate valve housing 1, a screwing structure 30 is provided on the inner peripheral surface 102 of the outer cylindrical body 10 and the outer peripheral surface 201 of the inner cylindrical body 20 in order to facilitate the height position adjustment.

  FIG. 3 is a perspective view illustrating a state in which the outer cylinder and the inner cylinder are cut along the vertical direction.

  In the screw type gate valve housing 1 of the present embodiment, as the screwing structure 30, an internal thread portion 31 is provided on the inner peripheral surface 102 of the outer cylindrical body 10, and a male thread portion is provided on the outer peripheral surface 201 of the inner cylindrical body 20. A screw portion 32 is provided. Therefore, by rotating the inner cylinder 20 in the circumferential direction with respect to the outer cylinder 10 fixedly installed on the housing (not shown), the inner cylinder 20 moves up and down, and the opening above the inner cylinder 20 is opened. 20a can be easily adjusted to the same height as the ground. In the thread groove 311 of the female thread portion 31 provided on the inner peripheral surface 102 of the outer cylindrical body 10, recessed portions 312 that are recessed outward are provided at intervals of 60 ° in the circumferential direction of the outer cylindrical body 10. These recesses 312 are provided in accordance with the positions of the overhanging portions 12 of the outer cylindrical body 10, and where the overhanging portions 12 are located on the outer peripheral surface 101, there are recesses 312 on the inner peripheral surface 102. Become. In addition, at the lower end portion of the inner peripheral surface 202 of the inner cylinder 20, three protrusions 21 are provided at 120 ° intervals in the circumferential direction of the inner cylinder 20.

  As shown in FIG. 2, the screw type gate valve housing 1 of the present embodiment also has a ring body 40. The ring body 40 is separate from the outer cylinder body 10 and the inner cylinder body 20, and is disposed inside the inner cylinder body 20. One long fixed claw 51 and two short fixed claws 52, although only one is shown in FIG. Hereinafter, the long fixed claw 51 and the short fixed claw 52 may be collectively referred to simply as a fixed claw.

  4 is a perspective view when the ring body shown in FIG. 2 is viewed, and FIG. 5 is a perspective view when the ring body shown in FIG. 2 is viewed upside down.

  The ring body 40 is provided with three attachment portions 42 for attaching the fixing claws (51, 52) shown in FIG. 2 at intervals of 120 ° in the circumferential direction. Each attachment portion 42 is provided inside the outer peripheral edge 431 of the annular portion 43 of the ring body 40. Each of these attachment portions 42 includes a top wall 421, a bottom wall 422, and a pair of side walls 423 provided at intervals in the circumferential direction. The outer wall which becomes the direction outer side and the inner wall which becomes the inner side are not provided and the outer side and the inner side are opened. Moreover, these three attachment parts 42 differ in height position. That is, the attachment portion 42 shown on the starboard side of FIG. 4 has the upper wall 421 above the annular portion 43 and is provided at the highest position among the three attachment portions 42. In a state where the ring body 40 is disposed inside the inner cylinder 20, the starboard mounting portion 42 is closest to the opening 20 a (see FIG. 2) above the inner cylinder 20. On the other hand, both the attachment portion 42 shown in the front of FIG. 4 and the attachment portion 42 shown on the port side have the upper wall 421 at the same height as the upper surface 430 of the annular portion 43, but the port attachment portion 42. Is longer than the front mounting portion 42, and the port mounting portion 42 is provided at the lowest position among the three mounting portions 42. The height positional relationship between the three attachment portions 42 is a relationship adapted to the lead angle of the female screw portion 31 provided in the outer cylindrical body 10. The upper wall 421 and the bottom wall 422 are provided with bolt holes 424 through which the bolts 41 shown in FIG. Each fixing claw (51, 52) is provided with a thread groove 510 (see FIG. 2) to be screwed with the bolt 41. As shown in FIG. 2, the fixed claws (51, 52) are attached to the attachment portion 42 with the bolts 41 inserted through the bolt holes 424 with the tip portions 511, 521 facing outward. That is, all the fixing claws (51, 22) attached to the attachment portion 42 by the bolt 41 are in a state of extending outward from the opening 425 outside the attachment portion 42. In the ring body 40 shown in FIG. 4, the long fixed claw 51 shown in FIG. 2 is attached to the highest attachment portion 42 shown on the starboard side, and the short fixed claw 52 is attached to the remaining two attachment portions 42. It is done. As a result, the long fixed claw 51 extends outward at the highest position, and the short fixed claw 52 attached to the port attachment 42 extends outward at the lowest position. . The long fixed claw 51 attached to the attachment portion 42 of the ring body 40 extends longer than the short fixed claw 52 toward the outside. In addition, although it is free to attach to which attachment part 42 each fixed nail | claw (51,52) is attached, from the viewpoint of workability | operativity mentioned later, the starboard nearest to the upper opening 20a (refer FIG. 2) here. The long fixed claw 51 is attached to the attachment portion 42 of the above.

  As shown in FIG. 5, six small protrusions 433 are arranged in the circumferential direction between the attachment portion 42 and the attachment portion 42 on the lower surface 432 of the annular portion 43. That is, the small protrusions 433 are arranged at a pitch narrower than the circumferential interval between the adjacent fixed claws (51, 52) attached to the attachment portion. These small protrusions 433 are provided at intervals of 10 °. Between the adjacent small protrusions 433 and the small protrusions 433, the protruding portion 21 provided on the inner peripheral surface 202 of the inner cylinder 20 shown in FIG. 3 is fitted. As described above, the three protruding portions 21 provided on the inner cylinder 20 are provided at intervals of 120 ° in the circumferential direction of the inner cylinder 20. The ring body 40 is supported by the inner cylindrical body 20 in a stable state by fitting each of the three protrusions 21 between three adjacent small protrusions 433 and 433. That is, the ring body 40 is engaged with the inner cylinder 20 at three locations in the circumferential direction of the inner cylinder 20. The ring body 40 engaged with the inner cylinder 20 in this way cannot rotate in the circumferential direction. A large protrusion 435 is provided between the six small protrusions 433 and the attachment portion 42. The protrusion length of the small protrusion 433 is 5 mm, whereas the protrusion length of the large protrusion 435 is 13 mm.

  Further, the annular portion 43 is provided with a notch 434 at a position where the attachment portion 42 is provided. The cutout part 434 is a part cut out on the inner side. The ring body 40 shown in FIG. 4 is disposed inside the inner cylinder body 20 from below the inner cylinder body 20 shown in FIG. 3 with the two short fixing claws 52 attached to the attachment portion 42. When the ring body 40 is inserted from the opening 20 b below the inner cylinder body 20, the notch portion 434 is formed so as not to interfere with the protrusion section 21 provided on the inner peripheral surface 202 of the inner cylinder body 20. 21, the ring body 40 is arranged inside the inner cylinder 20.

  In the screw type gate valve housing 1 of the present embodiment, the height position of the inner cylinder 20 is adjusted by rotating the inner cylinder 20 in the circumferential direction, and when the height position adjustment is completed, the inner cylinder is finished. The inner cylinder 20 is fixed to the outer cylinder 10 so that the 20 does not rotate.

  FIG. 6 is a diagram showing in a stepwise manner the state from the height position adjustment of the inner cylinder to the fixing of the inner cylinder in the screw type gate valve housing of the present embodiment.

  Fig.6 (a) shows the initial state in the screw type gate valve housing 1 of this embodiment. In this initial state, the outer cylindrical body 10 is bolted to a housing (not shown). The inner cylinder 20 is at the lowest position. Further, a ring body 40 is disposed inside the inner cylinder 20. The ring body 40 is engaged with the inner cylinder 20 and is supported by the inner cylinder 20 so as not to rotate. Of the three attachment portions 42 provided on the ring body 40, each of the two attachment portions 42 has a short fixing claw 52 attached thereto by a bolt 41. However, the bolt 41 is not in a completely tightened state. , To some extent relaxed. Moreover, the long fixed nail | claw 51 is not yet attached to the attachment part 42 nearest to the upper opening 20a among the remaining three attachment parts 42. FIG.

  As shown in FIG. 6B from the initial state shown in FIG. 6A, the inner cylinder 20 is rotated in the circumferential direction to raise the inner cylinder 20, and the opening 20a above the inner cylinder 20 is opened. The height position of the inner cylinder 20 is adjusted so that it is at the same height as the ground. That is, the height position of the inner cylinder 20 is adjusted so that there is no step between the upper edge 200 of the inner cylinder 20 and the surrounding ground. When rotating the inner cylinder 20, the tip 521 of the short fixing claw 52 attached to the ring body 40 is located between the screw thread 313 and the screw thread 313 in the female thread portion 31 of the outer cylinder 10, and The cylindrical body 10 is not in contact, and the short fixing claw 52 does not prevent the inner cylindrical body 20 from rotating.

  When the height position adjustment of the inner cylindrical body 20 is finished, the ring body 40 is fitted to the protruding portion 21 provided on the inner peripheral surface 202 of the inner cylindrical body 20 shown in FIG. 3 as shown in FIG. Lift it up until it comes off. That is, since the protrusion length of the small protrusion 433 provided on the ring body 40 is 5 mm as described above, the ring body 40 is lifted higher than 5 mm. Here, when the ring body 40 is lifted by 10 mm, the tip 521 of the short fixing claw 52 hits the screw thread 313 in the female thread portion 31 of the outer cylindrical body 10, and the ring body 40 does not lift higher than 10 mm. Thus, the engagement of the ring body 40 with the inner cylinder 20 is once released.

  The ring body 40 that has been disengaged from the inner cylinder body 20 is rotatable within a range of 60 ° in the circumferential direction inside the inner cylinder body 20, and as shown in FIG. Is rotated in the circumferential direction. At this time, the inner cylinder 20 does not rotate, and only the ring body 40 rotates. As shown in FIG. 5, the rotatable range (adjustable range) for adjusting the position of the ring body 40 is 60 °. As described above, even if the ring body 40 that can only be lifted up to 10 mm is rotated beyond the adjustable range shown in FIG. 5, the large protrusion 435 provided on the ring body 40 with a protrusion length of 13 mm is It collides with the protruding portion 21 of the cylindrical body 20 and is restricted from rotating beyond the adjustable range. This is because the recesses 312 provided on the inner peripheral surface 102 of the outer cylindrical body 10 are provided at intervals of 60 ° in the circumferential direction, and therefore the ring body 40 may be rotated by 60 ° at the maximum. . When the ring body 40 is rotated, the ring body 40 is rotated so that the attachment part 42 of the ring body 40 comes to the position of the overhanging portion 12 provided on the outer peripheral surface 101 of the outer cylindrical body 10. As described above, the concave portion 312 provided on the inner peripheral surface 102 of the outer cylindrical body 10 is provided in accordance with the position of the overhanging portion 12 of the outer cylindrical body 10, and thus, by rotating in this way, The position of the tip portion 521 in the short fixed claw 52 matches the position where the recess 312 (a recess different from the recess illustrated in FIG. 6D) is provided.

  When the alignment of the ring body 40 is completed, the ring body 40 is lowered as shown in FIG. When the ring body 40 is lowered, the three protrusions 21 (see FIG. 3) provided on the inner cylinder 20 are respectively provided between the three adjacent small protrusions 433 and the small protrusions 433 provided on the ring body 40. ) Each is fitted, the ring body 40 is engaged with the inner cylinder body 20, and the ring body 40 is supported by the inner cylinder body 20 in a non-rotatable manner. Here, when the ring body 40 does not engage the inner cylinder 20 well, the ring body 40 is engaged with the inner cylinder 20 by slightly rotating the ring body 40 (an angle of less than 10 °). To do. If the ring body 40 still does not engage with the inner cylinder body 20, the inner cylinder body 20 is rotated by 10 °. In the screw type gate valve housing 1 in this embodiment, as shown in FIG. 5, the space between the small protrusions 433 in the ring body 40 is the minimum adjustment range for adjusting the height position of the inner cylindrical body 20. The rotation angle is 10 °. When the inner cylinder 20 is rotated once, if the height position changes by 30 mm, the height position changes by 0.83 mm if the inner cylinder 20 is rotated by 10 °, but within a range of less than 1 mm. Height adjustment with the ground becomes possible. Since the fine adjustment can be performed in this manner, the height position of the inner cylinder 20 can be extremely easily adjusted. The distal end portion of the short fixing claw 52 is positioned below the inner cylinder 20.

  Next, as shown in FIG. 6 (f), the long fixed claw 51 is inserted from the inner opening 426 into the attachment portion 42 to which the long fixed claw 51 is not attached. When inserting the long fixed claw 51, the user inserts his hand through the upper opening 20a. The attachment part 42 to which the long fixed claw 51 is not attached is the attachment part 42 closest to the opening 20a above the three attachment parts 42, and the long fixed claw 51 can be easily inserted. The distal end portion of the inserted long fixed claw 51 enters the recess 312 (a recess different from the recess illustrated in FIG. 6D). Here, if the long fixed claw 51 cannot be inserted well, the previous ring body 40 is not properly aligned. In this case, the ring body 40 is aligned again. Just do it. The distal end portion of the long fixed claw 51 is also positioned below the inner cylinder 20.

  When the insertion of the long fixed claw 51 is finished, as shown in FIG. 6G, the bolt 41 is inserted into the mounting portion 42 into which the long fixed claw 51 has been inserted, and finally, as shown in FIG. The bolts 41 of the two attachment portions 42 are tightened evenly. The fixing claws (51, 52) provided with the screw grooves 510 are lifted by tightening the bolt 41, and the upper surfaces of the tip portions 511, 521 of the long fixing claws 51 and the two short fixing claws 52 shown in FIG. 511a and 521a are in contact with the thread 313 of the female thread portion 31 in the outer cylinder 10 from below. That is, the tip portions 511, 521 of the fixed claws (51, 52) are in contact with the outer cylinder 10 below the inner cylinder 20. In this way, the long fixed claw 51 and the two short fixed claws 52 are in contact with the outer cylinder 10 at intervals of 120 ° in the circumferential direction, thereby preventing the inner cylinder 20 from rattling in the horizontal direction. In addition, as shown in FIG. 2, the screw thread 313 of the female thread portion 31 in the outer cylinder 10 is sandwiched between the thread 323 of the male thread portion 32 in the inner cylinder 20 and the tip portion 511 of the long fixing claw 51. It is. The thread 313 of the outer cylinder 10 is also sandwiched between the thread 323 of the inner cylinder 20 and the tip portions 521 of the two short fixing claws 52, and is sandwiched at three places in total. Therefore, the backlash of the inner cylinder 20 in the horizontal direction is reliably prevented, and further, the rotation of the inner cylinder 20 in the circumferential direction is also reliably prevented.

  FIG. 7 is a bottom view of the screw type gate valve housing in a state where the inner cylindrical body has been fixed.

  The screw type gate valve housing 1 shown in FIG. 7 is a view as seen from the flange 11 side (downward) of the outer cylinder body 10. FIG. 7 shows a short fixed claw 52 facing the 4 o'clock direction and the 8 o'clock direction, and a long fixed claw 51 facing the 12 o'clock direction. A plurality of these fixing claws (51, 52) are provided toward the outer cylinder body 10 at intervals in the circumferential direction of the outer cylinder body 10. Further, the tip portion 521 of the short fixed claw 52 does not enter the recess 312 provided in the inner peripheral surface 102 of the outer cylinder 10, but the tip portion 511 of the long fixed claw 51 enters the recess 312. . The front end portion 511 of the long fixed claw 51 shown in FIG. 7 enters the middle (circumferential center portion) of the recess 312 and is not in contact with the side wall 3121 that defines the recess 312, but is slightly shifted. When the distal end portion 511 of the long fixed claw 51 enters the recess 312, the distal end portion 511 contacts the side wall 3121 of the recess 312. The long fixed claw 51 in contact with the side wall 3121 prevents the inner cylinder 20 from rotating toward the side wall 3121.

  Further, even if the screw type gate valve housing 1 of the present embodiment is used for a long period of time and the bolt 41 to which the long fixed claw 51 is attached is loosened, the tip portion of the long fixed claw 51 that has entered the recess 312. 511 comes into contact with the side wall 3121 and the inner cylinder 20 is prevented from rotating.

  FIG. 7 shows a snap ring 44 for preventing the bolt from slipping, which is fitted to the lower end of the bolt 41 that has the short fixing claw 52 attached to the attachment portion 42.

  FIG. 8 is a view showing a state in which an inner lid is installed in the screw type gate valve housing of the present embodiment.

  In a cut-off valve housing installed on a gate valve (not shown) such as a water pipe buried in the ground, an inner lid may be provided so that sand or the like is not applied to the gate valve. The ring body 40 supported by the inner cylinder 20 so as not to rotate also functions as a receiving frame for the inner lid 6. The inner lid 6 shown in FIG. 7 has a shape that follows the shape of the upper surface of the ring body 40.

  In the screw type gate valve housing 1 of the present embodiment described above, the inner cylinder 20 is not provided with a through hole. Further, since the fixing claws (51, 52) are in contact with the outer cylinder body 10 below the inner cylinder body 20, the position of the bolt 41 that attaches the fixing claws (51, 52) to the attachment portion 42 is also on the lower side. . For this reason, it takes a considerable time for the sand that gradually moves downward along the screwing structure 30 to reach the bolt 41, and it is difficult for the sand to reach the bolt 41. Therefore, according to the screw type gate valve housing 1 of the present embodiment, it is difficult for sand to be caught in the screw groove of the bolt 41, and the possibility that the height position of the inner cylinder 20 cannot be changed is reduced. In addition, it is not necessary to provide a through hole in the inner cylinder 20 made of cast iron, and it is not necessary to integrally provide the mounting portion 42 of the fixing claw (51, 52) in the inner cylinder 20, so that the core shape is simple. This facilitates the manufacture of the inner cylinder 20.

  Further, according to the screw type gate valve housing 1 of the present embodiment, the ring body 40 is arranged between the recess 312 provided in the outer cylinder 10 and the recess 312 adjacent to the recess 312 (in a range of 60 °). Just turn. When the ring body 40 is to be rotated 360 °, the tip 521 of the short fixing claw 52 changes in the height direction by 30 mm. On the other hand, as long as the ring body 40 is rotated by 60 ° as in the present embodiment, the tip 521 of the short fixing claw 52 only needs to move in the height direction of 5 mm, and the operation time of the bolt 41 is sufficient. Takes a short time.

  In the description here, the explanation has been given by taking as an example the cut-off valve housing installed on the gate valve such as a water pipe buried in the ground, but the present invention is not limited to the cut-off valve housing. It can be widely applied to housing for underground structures. Further, in this embodiment, the two short fixed claws 52 are provided in addition to the long fixed claws 51. However, even if the tip portion 511 is only the long fixed claws 51 that enter the concave portion 312 of the outer cylindrical body 10, the inner cylinder The rotation of the body 20 in the circumferential direction can be prevented, and the short fixing claw 52 may be omitted. Further, a plurality of long fixed claws 51 may be provided, and one or three or more short fixed claws 52 may be provided. However, since the upper surfaces 511a and 521a are provided with a plurality (preferably three or more) of fixing claws 51 and 52 that are in contact with the thread 313 of the female thread portion 31 in the outer cylindrical body 10, the horizontal play of the inner cylindrical body 20 can be reduced. Sticking is prevented.

  Subsequently, a modified example of the screw type gate valve housing of the present embodiment will be described. In the following description of the modified examples, the same reference numerals as those used so far are used for components having the same names as the components described so far. Moreover, the description which overlaps with the description so far is abbreviate | omitted.

  FIG. 9 is a perspective view showing a modified example of the screw type gate valve housing of the present embodiment, and FIG. 10 is a plan view of the modified screw type gate valve housing.

  FIG. 9 shows the screw type gate valve housing 1 in a state where the alignment of the ring body 40 has been completed. FIG. 10 shows a state in which the screw type gate valve housing 1 in a state where the inner cylinder body 20 has been fixed is viewed from the opening 20 a side above the inner cylinder body 20.

  The screw type gate valve housing 1 of this modification is devised to make the alignment of the ring body 40 easier. On the upper surface 430 of the annular portion 43 in the ring body 40 shown in FIG. 9, six alignment marks 435 are provided at intervals of 60 ° in the circumferential direction. The alignment mark 435 is a triangular depression. Further, one alignment protrusion 13 is provided on the lower portion of the inner peripheral surface 102 of the outer cylindrical body 10 shown in FIG. In this modified example, when any one of the six alignment marks 435 provided on the ring body 40 comes to the position of the alignment protrusion 13, the mounting portion 42 of the ring body 40 is moved to the outer cylinder body. 10 is opposed to a recess 312 (a recess different from the recess illustrated in FIG. 9) provided on the inner peripheral surface 102. 9 and 10 show a state in which the alignment mark 435 is aligned with the position of the alignment protrusion 13. Therefore, in this modification, when the ring body 40 is aligned, the ring body 40 is rotated in the circumferential direction, and the alignment mark 435 of the ring body 40 is formed on the alignment protrusion 13 of the outer cylinder 10. If combined, the position of the tip portion 521 in the short fixing claw 52 shown in FIG. 9 matches the position where the recess 312 (a recess different from the recess shown in FIG. 9) is provided, and is attached later. Then, the position of the tip portion 511 in the long fixed claw 51 (not shown) also matches the position where the recess 312 (a recess different from the recess shown in FIG. 9) is provided.

  The alignment mark 435 is not limited to a triangular depression and may be any mark.

It is a perspective view of the screw type gate valve housing which is one embodiment of the housing for underground structures of the present invention. It is sectional drawing of the screw type gate valve housing shown in FIG. It is a perspective view showing the state which cut | disconnected the outer cylinder body and the inner cylinder body along the up-down direction. It is a perspective view when the ring body shown in FIG. 2 is seen. It is a perspective view when the ring body shown in FIG. 2 is seen upside down. It is the figure which showed the mode from the height position adjustment of an inner cylinder to fixation of an inner cylinder in the screw type gate valve housing of this embodiment in steps. It is a bottom view of the screw type gate valve housing in a state where the inner cylinder is fixed. It is a figure which shows a mode that the inner cover was installed in the screw type gate valve housing of this embodiment. It is a perspective view which shows the modification of the screw type gate valve housing of this embodiment. It is a top view of the screw type gate valve housing of a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screw type gate valve housing 10 Outer cylinder body 20 Inner cylinder body 21 Protrusion part 20a, 20b Opening 30 Screwing structure 31 Female thread part 312 Recessed part 32 Male thread part 40 Ring body 41 Bolt 42 Attachment part 433 Small protrusion 51 Long fixed claw 52 Short fixed nails

Claims (2)

In the case for an underground structure including an outer cylinder that is fixedly installed, and an inner cylinder that is opened up and down and the upper opening is closed by a lid,
A screwing structure in which the inner cylinder moves up and down along the inner peripheral surface of the outer cylinder by rotating the inner cylinder in the circumferential direction is an outer peripheral surface of the inner cylinder and an inner periphery of the outer cylinder. Provided on the surface,
The underground structure housing further includes a fixing claw that contacts the outer cylindrical body below the inner cylindrical body and prevents circumferential rotation of the inner cylindrical body ,
A plurality of the fixing claws are provided toward the outer cylindrical body at intervals in the circumferential direction of the outer cylindrical body, and along the circumferential direction of the outer cylindrical body separately from the inner cylindrical body A housing for an underground structure that rotates and the upper surface of the fixed claw comes into contact with the outer cylinder . A ring body that is disposed inside the inner cylinder body and rotates in a circumferential direction of the outer cylinder body separately from the inner cylinder body;
A plurality of the fixing claws are provided at intervals in the circumferential direction of the ring body,
2. The ring body according to claim 1, wherein the ring body changes its position stepwise in the circumferential direction at a pitch narrower than a circumferential interval provided with the fixed claws, and engages with the inner cylinder body. Enclosure for underground structure as described.

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