JP2013104209A - Pit opening/closing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pit opening/closing structure, in which the inclination angle range of a receiving frame inserted into a pit is enlarged by forming a sufficient clearance between an insertion part of the receiving frame and the pit and the receiving frame can be obliquely installed according to the inclination of a road surface.SOLUTION: A pit opening/closing structure includes in an upper part of a pit 2: a receiving frame 5 and a lid 6 fitted in the upper part of a rise pipe 4; and fixing means 10 for fixing the receiving frame 5 to the rise pipe 4. The receiving frame 5 has an external flange 5e having a diameter larger than that of the rise pipe in the upper part, and an insertion part 5a inserted into the rise pipe 4 in the lower part; a clearance (S) is formed between the insertion part 5a and the rise pipe 4; the fixing means 10 is screwed in the insertion part 5a and consists of a bolt 8 protruding from an outer peripheral surface and a falling-off prevention projection 9; a base plate 3 has a ring-shaped upper frame 3a which is formed on the top face and in which the rise pipe 4 is fitted, and a ring-shaped lower frame 3b which is formed on the underside and in which the pit 2 is fitted; and the base plates 3 are overlapped while a crest part 7a and a trough part 7b are engaged with each other.

Description

  The present invention provides, for example, a pit opening / closing for opening / closing a pit constructed on the opening / closing valve in order to enable an opening / closing operation of the opening / closing valve attached to a gas pipe buried underground. More particularly, the present invention relates to a pit opening / closing structure in which the height of a receiving frame into which a lid is fitted and the inclination installation can be easily performed.

  Conventionally, as a pit opening / closing structure similar to a pit opening / closing structure constructed on the opening / closing valve in order to enable an opening / closing operation of an opening / closing valve, such as a gas pipe, buried underground, from the ground, Patent Document 1 (JP 2010-101051 A) discloses the following pit opening and closing structure. Hereinafter, this pit opening / closing structure is referred to as a conventional pit opening / closing structure and will be described with reference to the drawings.

  16 is a cross-sectional view showing a conventional pit opening / closing structure, and FIG. 17 is a cross-sectional view showing a state in which the height of the receiving frame is increased in the conventional pit opening / closing structure.

  As shown in FIGS. 16 and 17, the conventional pit opening and closing structure includes a rising pipe 13 installed vertically on a pit 12 (see FIG. 16) installed at a connection portion of a drain pipe 11 buried in the ground. The connecting pipe 14 is fitted into the upper outer side of the rising pipe 13, the receiving frame 15 is fitted into the upper inner side of the connecting pipe 14, and the lid 16 is fitted into the receiving frame 15.

  The connecting pipe 14 includes an upper part 14a and a lower part 14b. The inner diameter dimension of the upper part 14a is equal to the inner diameter dimension of the rising pipe 13, and the inner diameter dimension of the lower part 14b is equal to the outer diameter dimension of the rising pipe 13. In this way, the connecting pipe 14 can be fitted into the upper part of the rising pipe 13 by making the outer diameter of the connecting pipe 14 different in two stages, upper and lower, so that the length of the rising pipe 13 is set to the upper part of the connecting pipe 14. The length can be increased by the length of 14a.

  If the increased length of the riser 13 is less than the length of the upper part 14a of the connecting pipe 14, the upper part 14a may be cut by a predetermined length. When the increased length of the rising pipe 13 is longer than the length of the upper part 14a of the connecting pipe 14, a plurality of connecting pipes 14 (two in this example) are installed in series as shown in FIG. good.

JP 2010-101051 A

  According to the above-described conventional pit opening / closing structure, the length of the rising pipe 13 can be adjusted by the connecting pipe 14 fitted into the upper part of the rising pipe 13, so that the height adjustment of the receiving frame 15 into which the lid 16 is fitted is Easy to do. Therefore, the level of the lid 16 fitted into the receiving frame 15 can be easily matched with the level of the road surface (G).

  However, according to the conventional pit opening and closing structure, the height of the receiving frame 15 can be easily adjusted, but there is a problem in dealing with the case where the road surface (G) is inclined. That is, when the road surface (G) is inclined, the upper part of the connecting pipe 14 is cut obliquely in accordance with the inclination of the road surface (G), and the receiving frame 15 is fitted into the upper part 14a of the connecting pipe 14 cut obliquely. However, since there is basically no gap between the receiving frame 15 and the upper portion 14a, the receiving frame 15 cannot be obliquely fitted into the upper portion 14a of the connecting pipe 14, and the road surface (G) is inclined. In addition, there is a problem that the receiving frame 15 cannot be installed obliquely.

  Accordingly, an object of the present invention is to provide a pit opening / closing structure capable of easily adjusting the height of a receiving frame into which a lid is fitted and inclined installation in a pit opening / closing structure constructed on a valve attached to a buried pipe. is there.

  The present invention has been made to achieve the above object, and is characterized by the following.

  According to the first aspect of the present invention, in a pit opening / closing structure installed on an upper part of a valve attached to an embedded pipe, a rising pipe connected to the upper part of the pit via a ring-shaped bottom plate, and the rising pipe A receiving frame fitted into the upper portion, a lid fitted into the receiving frame, and a fixing means for fixing the receiving frame to the riser tube, the receiving frame having an outer flange larger than the outer diameter of the riser tube at the upper portion. A lower portion having an insertion portion into the riser, and a gap is formed between the insertion portion and the riser to allow the receiving frame to be inserted into the riser at an angle. The fixing means is screwed into the insertion portion, and a bolt having a length such that a tip of the screw portion protrudes from the outer peripheral surface of the insertion portion, and a retainer provided on the outer peripheral surface of the insertion portion The bottom plate is formed with a ring-shaped upper frame into which the lower part of the riser pipe is fitted on the upper surface, and a ring-shaped lower frame with the upper part of the pit fitted into the lower surface, and the upper frame and the lower part The frame is formed by alternately forming crests and troughs in the circumferential direction, and is characterized in that the crests and troughs mesh with each other when the bottom plates are overlapped.

  The invention according to claim 2 is characterized in that, in the pit opening and closing structure according to claim 1, the riser pipe is made of a resin that can be easily processed.

  According to the present invention, the following effects are brought about.

  (1) By forming a sufficient gap between the insertion portion of the receiving frame and the rising pipe, the inclination angle range of the receiving frame to be inserted into the rising pipe can be greatly increased, so that the receiving frame is adapted to the inclination of the road surface. Can be easily installed at an angle.

  (2) By providing a fixing means comprising a bolt that is screwed into the insertion portion of the receiving frame and a retaining protrusion formed on the outer peripheral surface of the insertion portion, it is possible to ensure that the receiving frame does not rattle or the receiving frame comes out of the riser tube. Can be prevented.

  (3) By connecting the riser pipe to the pit via the bottom plate, the riser pipe can be reliably installed in the pit, and by receiving the load applied to the receiving frame by the bottom plate, the receiving frame is reliably prevented from sinking. can do.

  (4) By constituting the upper frame and the lower frame of the bottom plate by alternately forming ridges and valleys in the circumferential direction, the riser tube fitted in the upper frame can be made difficult to fall down. At the same time, it is possible to make it difficult for the bottom plate to come off from the pit fitted in the lower frame. In addition, when the bottom plates are stacked, the peak portion and the valley portion mesh with each other, so that the stack height can be lowered.

  (5) By making the pit or riser easy to process, for example, vinyl chloride, it is easy to cut the pit or riser when adjusting the length of the pit or riser or tilting the receiving frame. It can be carried out.

It is sectional drawing which shows the pit opening / closing structure of this invention constructed | assembled on the flat ground. It is sectional drawing which shows the pit opening and closing structure of this invention constructed | assembled on the inclined ground. It is a top view which shows the receiving frame in the pit opening / closing structure of this invention. It is a front view which shows the receiving frame in the pit opening / closing structure of this invention. It is a bottom view which shows the receiving frame in the pit opening / closing structure of this invention. It is a top view which shows the cover in the pit opening / closing structure of this invention. It is a front view which shows the cover in the pit opening / closing structure of this invention. It is a bottom view which shows the cover in the pit opening and closing structure of this invention. It is a front view which shows the baseplate in the pit opening / closing structure of this invention. It is a top view which shows the baseplate in the pit opening / closing structure of this invention. It is a right view which shows the receiving frame in the pit opening / closing structure of this invention. It is a left view which shows the receiving frame in the pit opening / closing structure of this invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is a front view which shows the state which accumulated the baseplate in the pit opening / closing structure of this invention. It is sectional drawing which shows the conventional pit opening / closing structure. It is sectional drawing which shows the state which raised the height of the receiving frame in the conventional pit opening / closing structure.

  Next, an embodiment of the pit opening / closing structure of the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view showing a pit opening / closing structure of the present invention installed on a flat ground, and FIG. 2 is a sectional view showing a pit opening / closing structure of the present invention constructed on an inclined ground.

  1 and 2, reference numeral 1 denotes a pit opening / closing structure of the present invention. A pit opening / closing structure 1 according to the present invention is installed in a pit 2 buried underground and has a function of opening / closing the pit 2. The pit 2 is made of a resin such as vinyl chloride, and is built vertically, for example, above an opening / closing valve (not shown) of a gas pipe embedded in the basement. The opening / closing operation of the opening / closing valve can be performed from the ground (G) by opening a lid, which will be described later, of the pit opening / closing structure 1 and inserting an operation rod (not shown) into the pit 2.

  A pit opening / closing structure 1 according to the present invention includes a rising pipe 4 connected to an upper part of a pit 2 via a ring-shaped bottom plate 3, a receiving frame 5 fitted into the upper part of the rising pipe 4, and a lid 6 fitted into the receiving frame 5. , And a fixing means 10 for fixing the receiving frame 5 to the rising pipe 4.

  As shown in FIGS. 3 to 5, an outer flange 5 e larger than the outer diameter of the pit 2 is formed on the upper portion of the receiving frame 5, and an insertion portion 5 a to be inserted into the pit 2 is formed on the lower portion of the receiving frame 5. Has been. By forming the outer flange 5 e on the receiving frame 5, the load applied to the receiving frame 5 is received by the outer flange 5 e, so that the sinking of the receiving frame 5 due to the load applied to the receiving frame 5 can be reduced.

  An inner flange 5b is formed on the upper inner peripheral surface of the insertion portion 5a of the receiving frame 5, and a pair of stopper cutouts 5c is formed on the inner flange 5b. After a stopper, which will be described later, formed on the lid 6 is aligned with the stopper notch 5c, the lid 6 is rotated to a position where the stopper comes to the lower surface of the flange 5b, so that the lid 6 is removed from the receiving frame 5. It can be surely prevented.

  A positioning notch 5 d is formed on the inner peripheral surface of the outer flange 5 e of the receiving frame 5. The positioning notch 5d is formed at a position where the stopper of the lid 6 comes to the lower surface of the inner flange 5b of the receiving frame 5 when a positioning projection described later of the lid 6 is fitted in the positioning notch 5d. It is. Therefore, if the lid 6 is rotated until the positioning projection is fitted into the positioning notch 5d, the lid 6 is automatically locked by the stopper. Thus, it is possible to reliably prevent the lid 6 from coming off from the receiving frame 5.

  As shown in FIG. 1, a gap (S) is formed between the insertion portion 5 a of the receiving frame 5 and the pit 2. Since this gap (S) is formed wide so that the inclination angle range of the receiving frame 5 inserted into the pit 2 can be greatly increased, the receiving frame 5 is inclined according to the inclination of the road surface (G). Can be installed easily.

  As shown in FIGS. 1 and 2, the fixing means 10 includes a bolt 8 that has a length that is screwed into the insertion portion 5a of the receiving frame 5 and has a thread portion tip projecting from the outer peripheral surface of the insertion portion 5a, and the insertion portion 5a. And a retaining projection 9 provided on the outer peripheral surface of the. A pair of retaining projections 9 are provided on both sides of the bolt 8 at intervals of 120 °.

  According to the fixing means 10, when the insertion portion 5 a of the receiving frame 5 is inserted into the pit 2 and then the bolt 8 is tightened, the insertion portion 5 a is formed at a total of three locations: the screw tip of the bolt 8 and the pair of retaining projections 9. Is fixed to the pit 2, it is possible to reliably prevent the receiving frame 5 from coming out of the pit 2.

  If the fixing means 10 is provided at the lower portion of the insertion portion 5a, the distance between the fixing means 10 and the opening at the upper end of the pit 2 is increased. Therefore, compared to the case where the fixing means 10 is provided at the upper portion of the insertion portion 5a, The receiving frame 5 is difficult to escape from the pit 2.

  As shown in FIGS. 6 to 8, a pair of hook-shaped stoppers 6 a are formed on the lower surface of the lid 6. The pair of stoppers 6a are formed so that the lower flanges face each other. A positioning projection 6 b is formed on the upper outer peripheral surface of the lid 6. As described above, the positional relationship between the stopper 6a and the positioning projection 6b is such that the positioning projection 6b of the lid 6 fits into the positioning notch 5d of the receiving frame 5 after the stopper 6a is aligned with the stopper notch 5c. If the lid 6 is rotated to the insertion position, the collar portion of the stopper 6a is positioned below the flange 5b of the receiving frame 5 so that the lid 6 can be reliably prevented from coming off from the receiving frame 5. .

  As shown in FIGS. 9 to 14, the bottom plate 3 has a ring shape, has an outer diameter larger than the outer flange 5 e of the receiving frame 5, and reliably receives the load on the receiving frame 5 to sink the receiving frame 5. It has a function to prevent. A ring-shaped upper frame 3 a into which the lower part of the riser 4 is fitted is formed on the upper surface of the bottom plate 3, and a ring-shaped lower frame 3 b into which the upper part of the pit 2 is fitted is formed on the lower surface of the bottom plate 3. The upper frame 3a and the lower frame 3b are formed by alternately forming peaks 7a and valleys 7b in the circumferential direction. In this example, three peaks 7a and valleys 7b are formed, and the peaks 7a and valleys 7b of the upper frame 3a are circumferential with respect to the peaks 7a and valleys 7b of the lower frame 3b. Only half pitch. Accordingly, as shown in FIG. 15, when the bottom plates 3 are overlapped with each other, the peak portion 7a of one bottom plate 3 and the valley portion 7b of the other bottom plate 3 are engaged with each other. , Stacking height can be lowered. As a result, it is not bulky when the bottom plate 3 is transported.

  In addition, you may form the peak part 7a and trough part 7b of the upper frame 3a in the same position, without shifting only the half pitch in the circumferential direction with respect to the peak part 7a and trough part 7b of the lower frame 3b. In this case, when the bottom plate 3 is stacked, the bottom plate 3 may be rotated by a half pitch in the circumferential direction.

  Moreover, since the height of the part becomes high by forming the peak part 7a in the upper frame 3a and the lower frame 3b, the riser 4 fitted in the upper frame 3a can be prevented from falling down, and the lower part The bottom plate 3 can be made difficult to come off from the pits 2 fitted in the frame 3b. Note that if the height of the upper frame 3a is all increased, the riser 4 can be prevented from falling, but the weight of the bottom plate 3 is increased, and the bottom plate 7a and the trough portion 7b are engaged with each other. Since 3 cannot be stacked, it is bulky. Furthermore, as shown in FIG. 13, by forming the inner surface of the peak portion 7a of the upper frame 3a into a tapered shape that is upwardly widened at an angle (θ), the rising pipe 4 can be easily fitted and the peak portion of the lower frame 3b. By forming the inner surface of 7a into a taper shape extending downward at an angle (θ), the bottom plate 3 can be easily fitted into the pit 2.

  Further, as shown in FIGS. 9 and 10, if the protrusion 7c is formed in the height direction of the inner surface of the crest portion 7a of the upper frame 3a, the lower portion of the riser pipe 4 is lowered as shown in FIGS. Since the protrusion 7c bites into the tube wall of the rising tube 4 when fitted into the upper frame 3a, the rising tube 4 can be securely connected to the bottom plate 3. Moreover, if the protrusion 7c is formed in the height direction of the inner surface of the peak portion 7a of the lower frame 3b, the protrusion 7c bites into the pipe wall of the pit 2 as shown in FIGS. It can be securely fixed to the pit 2.

  Furthermore, if a recess (P) (see FIGS. 1 and 2) is formed in the inner corners of the upper frame 3a and the lower frame 3b, the lower surface of the riser 4 and the upper surface of the pit 2 and the bottom plate 3 are in close contact with each other. Therefore, the rising pipe 4 and the pit 2 can be connected through the bottom plate 3 without rattling. Usually, since the bottom plate 3 is made of a casting, the inner corner portion is inevitably provided with R in manufacturing, and the lower surface of the rising pipe 4 and the upper surface of the pit 2 and the bottom plate 3 are difficult to adhere. As a result, rattling may occur between the bottom plate 3 and the riser 4 and the pit 2.

  As will be described later, the riser 4 is made of a resin such as vinyl chloride in order to facilitate the cutting process of the riser 4 performed when the length of the riser 4 is adjusted or the receiving frame 5 is inclined.

  In order to install the pit opening / closing structure 1 of the present invention configured as described above on a flat road surface (G), as shown in FIG. 1, the upper end surface of the rising pipe 4 is cut horizontally. Then, the insertion portion 5a of the receiving frame 5 is inserted, and the bolt 8 is tightened. As a result, the tip of the threaded portion of the bolt 8 and the pair of retaining projections 9 come into contact with the inner peripheral surface of the rising tube 4, so that the receiving frame 5 is securely fixed to the rising tube 4 horizontally. Thereafter, the lid 6 is fitted into the receiving frame 5.

  In order to install the pit opening / closing structure 1 of the present invention on an inclined road surface (G), as shown in FIG. 2, the upper surface of the rising pipe 4 is cut obliquely in accordance with the inclination of the road surface (G), and the rising pipe 4 The insertion part 5a of the receiving frame 5 is inserted into the upper part of. The riser 4 can be easily cut by making the riser 4 made of a resin such as vinyl chloride. Thereafter, when the bolt 8 is tightened, the tip of the threaded portion of the receiving frame 5 and the pair of retaining projections 9 come into contact with the inner peripheral surface of the rising pipe 4, so that the receiving frame 5 matches the inclination of the road surface (G). It is securely fixed to the pit 2 at an angle. Thereafter, the lid 6 is fitted into the receiving frame 5. In this case, since a sufficiently wide gap is formed between the insertion portion 5a of the receiving frame 5 and the rising pipe 4, the inclination installation angle of the receiving frame 5 can be freely adjusted according to the inclination of the road surface (G). Can do.

  When the height of the receiving frame 5 is adjusted, the riser 4 is pulled out and replaced with a new one. The riser 4 is a straight pipe, and the riser 4 and the bottom plate 3 are raised. Since the lower part of the pipe 4 is connected by being fitted into the upper frame 3a of the bottom plate 3, the riser pipe 4 can be easily pulled out. Since the riser 4 can be easily pulled out, the amount of excavation of the soil when replacing the riser 4 is small.

  As described above, according to the present invention, by forming a sufficiently wide gap (S) between the insertion portion 5a of the receiving frame 5 and the rising tube 4, the inclination angle of the receiving frame 5 installed in the rising tube 4 is increased. Since the range can be greatly increased, the receiving frame 5 can be easily installed obliquely in accordance with the inclination of the road surface (G).

  Further, by tightening the bolt 8 screwed into the insertion portion 5a of the receiving frame 5, the tip of the screw portion of the bolt 8 and the pair of retaining projections 9 come into contact with the inner peripheral surface of the pit 2 or the rising pipe 4. Thus, it is possible to reliably prevent the receiving frame 5 from rattling or coming off from the riser tube.

  Further, by installing the rising pipe 4 in the pit 2 via the bottom plate 3, the rising pipe 4 can be reliably installed in the pit 2, and the load applied to the receiving frame 5 is received by the bottom plate 3. 5 can be reliably prevented from sinking.

  Further, the upper frame 3a and the lower frame 3b of the bottom plate 3 are formed by alternately forming the crests 7a and the troughs 7b in the circumferential direction, so that when the bottom plates 3 are stacked, the stacking height is increased. While being able to make it low, weight reduction of the baseplate 3 and prevention of the fall of the riser pipe 4 can be aimed at.

  Furthermore, by making the riser pipe 4 easy to process, for example, made of vinyl chloride, it is possible to easily perform the cutting process of the riser pipe when the length of the riser pipe 4 is adjusted or the receiving frame 5 is inclined. it can.

1: Pit opening / closing structure of the present invention 2: Pit 3: Bottom plate 3a: Upper frame 3b: Lower frame 4: Rising pipe 5: Receiving frame 5a: Insertion part 5b: Inner flange 5c: Notch for stopper 5d: Notch for positioning 5e : Outer flange 6: Lid 6a: Stopper 6b: Positioning projection 7a: Mountain portion 7b: Valley portion 8: Bolt 9: Retaining projection 10: Fixing means 11: Drain pipe 12: Pit 13: Rising pipe 14: Connecting pipe 14a: upper part of connecting pipe 14b: lower part of connecting pipe 15: receiving frame 16: lid

Claims (2)

  In the opening and closing structure of the pit installed on the upper part of the valve attached to the buried pipe, a rising pipe connected to the upper part of the pit via a ring-shaped bottom plate, a receiving frame fitted into the upper part of the rising pipe, A lid fitted into the receiving frame; and a fixing means for fixing the receiving frame to the riser pipe, the receiving frame having an outer flange larger than an outer diameter of the riser pipe at an upper part and into the riser pipe at a lower part. A gap is formed between the insertion portion and the riser to allow the receiving frame to be inserted into the riser at an angle, and the fixing means includes the insert A bolt having a length that protrudes from the outer peripheral surface of the insertion portion, and a retaining protrusion provided on the outer peripheral surface of the insertion portion. A ring-shaped upper frame in which the lower part of the riser pipe is fitted on the upper surface, and a ring-shaped lower frame in which the upper part of the pit is fitted is formed on the lower surface. The upper frame and the lower frame are crested in the circumferential direction. A pit opening and closing structure, wherein the ridges and the valleys are engaged with each other when the bottom plates are overlapped with each other.   The pit opening and closing structure according to claim 1, wherein the rising pipe is made of a resin that can be easily processed.

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