JP2006002474A - Synthetic resin manhole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin manhole with a synthetic resin riser having high strength against horizontal soil pressure and vertical soil pressure and enabling the use of inexpensive materials such as crushed stones for backfilling without causing deformation or breakage, the riser being connected to the upper face of the synthetic resin manhole embedded in soil. <P>SOLUTION: The synthetic resin manhole 2 comprises the riser 1 formed of a synthetic resin pipe 11 which has a reinforcing rib 12 on the outer peripheral face continuously in the pipe axial direction. The riser 1 is connected to the upper part of the synthetic resin manhole 2 embedded in soil. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a synthetic resin riser pipe connected to an upper portion of a synthetic resin manhole installed in a drainage pipe laid in the soil, and more specifically, the riser pipe is operated in the horizontal direction. In addition, the present invention relates to a synthetic resin manhole having a riser that exhibits high strength against earth pressure acting in the vertical direction and does not deform or break.

  Conventionally, large manholes made of concrete have been used for the inspection port of sewage pipes, but these large manholes are difficult to install on narrow roads or bent places. Has been used. Synthetic resin pipes have been used as risers for cleaning and inspection connected to the upper surface of synthetic resin manholes buried in the soil. When this synthetic resin manhole is installed in the soil, in order to prevent the synthetic resin manhole from sinking and to fix the riser pipe connected thereto, crushed stones and the like are put around these to be backfilled The work is done by using a vibrator or tamping machine.

  However, when the earth pressure acting on the outer periphery of the riser in the horizontal direction (hereinafter referred to as horizontal earth pressure) becomes non-uniform during the above compacting operation, the riser is deformed into a flat shape. The roundness may not be maintained. In such a case, there has been a case where troubles are caused in the pipe construction, for example, the attachment or removal of the inner lid attached to the upper end portion of the riser pipe cannot be performed smoothly.

  For this reason, conventionally, when using a general synthetic resin pipe as a riser pipe, for example, a thin-walled pipe made of vinyl chloride synthetic resin, as a material used for backfilling the riser pipe part, etc., high quality soil (for example, sand) A method for avoiding the application of local stress by using the above has been adopted. However, this method is costly because these high quality soils are usually expensive.

  In order to solve these problems, proposals relating to the riser have been made with the aim of preventing radial deformation of the riser (see, for example, Patent Documents 1 and 2).

  A rising pipe for a drainage basin (referred to as a manhole made of synthetic resin in the present invention) described in Patent Document 1 is connected to the drainage basin in a drainage basin installed in a drainage pipe laid in the soil. The riser pipe is characterized by using a ribbed plastic pipe having reinforcing ribs continuous in the circumferential direction on the outer peripheral surface thereof.

  Thus, the riser for drainage described in Patent Document 1 uses a ribbed plastic pipe having high rigidity against radial deformation for the riser connected to the drainage installed in the ground Thus, it is said that the inner lid can be easily attached and removed.

  However, the proposal described in Patent Document 1 has a problem that if a plastic pipe provided with a reinforcing rib is used for a riser pipe for drainage, bending stress is applied to the reinforcing rib due to vertical earth pressure and there is a risk of breakage. is there.

  The pipeline construction method described in Patent Document 2 is a pipeline construction method having a structure without ribs connected to a ribbed pipe, and after protecting the structure with a protective material, A pipe construction method in which the structure is backfilled with crushed stone of the same kind as crushed stone for backfilling the pipe.

  In the pipe construction method described in Patent Document 2, since the joint portion without ribs is protected by being covered with a protective material, when backfilling, there is no concern that the projection of the crushed stone directly hits the joint portion, When a protective layer containing a skin layer and a foam layer is used, the skin layer prevents the crushed stone from entering, and the foam layer reduces the concentrated load and impact, and the concentrated load acting on the joint is protected. This has the effect of mitigating.

  However, although the pipeline construction method described in Patent Document 2 has the above-described effect, there is a problem that the number of parts used increases, the work at the time of construction is complicated, and the cost is increased.

JP-A-2002-371620 (first page to third page) JP 2002-4397 A (pages 1 to 6)

  In view of the above-mentioned conventional problems, the object of the present invention is that the riser made of synthetic resin connected to the upper surface of the synthetic resin manhole embedded in the soil has excellent strength against horizontal earth pressure and vertical earth pressure. The object of the present invention is to provide a manhole made of a synthetic resin that can be used as an inexpensive material such as crushed stone as a material for backfilling without causing deformation or breakage.

  The present invention has been made to achieve the above object, and the invention according to claim 1 is characterized in that the rising pipe connected to the upper part of the synthetic resin manhole embedded in the soil has a pipe axial direction on the outer peripheral surface. A synthetic resin manhole comprising a synthetic resin tube having continuous reinforcing ribs.

  The invention according to claim 2 is characterized in that the riser pipe connected to the upper part of the synthetic resin manhole embedded in the soil comprises a synthetic resin pipe having a continuous hole in the pipe axis direction in the pipe wall. And a synthetic resin manhole.

  The shape of the reinforcing rib as viewed from the direction perpendicular to the tube axis of the riser pipe of the present invention is a square, rectangular, trapezoidal, circular or elliptical part, triangle, etc. protruding from the outer peripheral surface of the synthetic resin pipe. Is done. In order to prevent the ribs from being damaged by earth pressure, in the case of a trapezoid or a triangle, it is desirable to arrange the trapezoid so that the upper base of the trapezoid and the apex of the triangle face the outside of the synthetic resin pipe. In the case of a square or a rectangle, in order to avoid wear due to the backfilling soil, the corners may be rounded. Further, it is preferable that the reinforcing rib portion has a hollow structure because the weight can be reduced.

  The reinforcing ribs are arranged so that the diameter of the synthetic resin tube coincides with the symmetry axis of each rib shape. Further, it is desirable that the reinforcing ribs are arranged on the outer periphery of the pipe so that the axis of symmetry of each rib shape is a position obtained by equally dividing the central angle of the synthetic resin pipe. These prevent the stress caused by backfilling from being applied locally, disperse the stress, and the riser has high strength against horizontal and vertical earth pressure, and does not deform or break This is a desirable arrangement.

  The reinforcing ribs are preferably formed by using a mold having an irregular shape when the synthetic resin pipe is extruded. This is because the strength as a structure is high by integral molding, which is generally advantageous in terms of cost. Alternatively, each reinforcing rib may be separately molded and welded and bonded to the synthetic resin tube.

  Each reinforcing rib is continuous in the tube axis direction of the outer peripheral surface of the synthetic resin pipe, but it is preferable that the reinforcing rib is not provided at the end for joining with the synthetic resin manhole.

  Further, the present invention is characterized in that the riser made of synthetic resin is composed of a synthetic resin pipe having holes continuous in the pipe axis direction in the pipe wall. As the shape of the hole viewed from the direction perpendicular to the tube axis, a square, a rectangle, a trapezoid, a part of a circle or an ellipse, a triangle, or the like is adopted. In the case of a square, rectangle, trapezoid, or triangle, each vertex may be rounded.

  The holes arranged continuously in the tube axis direction are desirably arranged so that the diameter of the synthetic resin tube coincides with the symmetry axis of each hole cross-sectional shape. In addition, it is desirable that each hole is arranged on the tube wall so that the symmetry axis of each hole is a position obtained by equally dividing the central angle of the synthetic resin tube. These, like the above-mentioned reinforcing ribs, prevent stress due to backfill soil from being applied locally, disperse the stress, and the rising pipe has high strength against horizontal earth pressure and vertical earth pressure. This is a desirable arrangement in order not to cause damage.

  The tube having the through hole in the axial direction is preferably formed by using an irregularly shaped mold when the synthetic resin tube is extruded.

  Each hole is continuous in the axial direction of the outer peripheral surface of the synthetic resin tube, and an adhesive putty for filling is used so that water does not enter the through hole at the joint portion with the synthetic resin manhole and the upper end portion. It is preferable to apply a water-stopping rubber.

  According to the first aspect of the present invention, the riser pipe connected to the upper part of the synthetic resin manhole embedded in the soil is made of a synthetic resin pipe having reinforcing ribs continuous in the pipe axis direction on the outer peripheral surface. Because it is a manhole made of synthetic resin, it has excellent strength against horizontal and vertical earth pressure, does not cause deformation or breakage, and inexpensive materials such as crushed stone are used as material for backfilling it can.

  Furthermore, since the invention of claim 2 is a riser pipe made of a synthetic resin made of a synthetic resin pipe having a continuous hole in the pipe axis direction in the pipe wall, it is apparent compared to a synthetic resin pipe having the same resin amount. Due to the increase in thickness and the reinforcing rib effect, the effect similar to that of the invention of claim 1 is obtained.

  Embodiments of a synthetic resin manhole according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a partial cross-sectional view showing an example of construction using a riser of a synthetic resin manhole of the present invention. In FIG. 1, 3 is a ribbed pipe (drainage pipe) having a circumferential rib. The synthetic resin manhole 2 is watertightly connected to drain pipes 3 and 3 buried in the soil.

  In FIG. 1, 1 is a rising pipe, 11 is a synthetic resin pipe, and 12 is a reinforcing rib. Reference numeral 2 denotes a manhole with a synthetic resin rib having circumferential ribs on the outer peripheral surfaces of the receiving opening and the insertion opening so that a ribbed pipe can be connected, 21 is a rising pipe receiving opening of the synthetic resin manhole, and the rising pipe receiving opening 21 is The end portion of the synthetic resin tube 11 is received and joined, and the rubber packing 4 adheres to the outer periphery of the end portion of the synthetic resin tube 11 to stop water. The rising pipe 1 is formed by integrally forming a reinforcing rib 12 on the outer peripheral surface of the synthetic resin pipe 11 in the pipe axis direction. The reinforcing rib 12 exhibits high strength against horizontal earth pressure and vertical earth pressure. It will not cause deformation or damage.

  For this reason, the crushed stone 5 can be used in this case as a material used for backfilling the synthetic resin manhole 2 and the riser 1 portion. Other inexpensive materials such as residual soil, reclaimed soil and improved soil can also be used. Use of protective material is unnecessary.

  FIG. 2 is a front view showing an example of the riser of the synthetic resin manhole according to the present invention as seen from the direction parallel to the tube axis. Each reinforcing rib 12 is continuous in the tube axis direction of the outer peripheral surface of the synthetic resin tube 11. In this case, the end portion is not provided with the reinforcing rib 12 for joining with the synthetic resin manhole. Yes, the short pipe serving as the insertion opening and the pipe with the reinforcing rib are adhesively bonded.

  When the riser receiving hole 21 of the synthetic resin manhole 2 is not a rubber ring packing joint, a junction (not shown) is provided at the lower end of the riser pipe 1 for joining the riser pipe 1 and the synthetic resin manhole 2. , You may connect. The riser pipe 1 and the conversion joint are connected to the inner peripheral surface of the conversion joint in a watertight manner through a rubber ring packing so that the vertical movement can be adjusted. In this case, each reinforcing rib may be provided up to the lower end of the riser 1.

  FIGS. 3A, 3B, 3C, and 3D are cross-sectional views showing an example of the riser of the synthetic resin manhole of the present invention as seen from the direction perpendicular to the tube axis. In FIG. 3, 1 is a rising pipe, 11 is a synthetic resin pipe, and 12 is a reinforcing rib.

  FIG. 3 (a) shows an example of a riser pipe in the case where the reinforcing rib has a rectangular shape with a small cross section. The arrangement of the reinforcing rib having a rectangular cross section is such that the diameter of the synthetic resin pipe coincides with the symmetry axis of each rib shape. In addition, the reinforcing ribs are arranged on the outer periphery of the pipe so that the axis of symmetry of each rib shape is a position obtained by equally dividing the central angle of the synthetic resin pipe. In (a), 40 reinforcing ribs having a rectangular cross section are arranged at positions obtained by dividing the central angle of the synthetic resin pipe into 40 equal parts. These prevent the stress caused by backfill soil from being applied locally to the pipe wall of the synthetic resin pipe, disperse the stress, and the rising pipe has high strength against horizontal earth pressure and vertical earth pressure. This is a desirable arrangement in order not to be deformed or damaged.

  (B) shows an example of a riser pipe in the case where the reinforcing rib has a rectangular shape with a large cross section, and is a case similar to (a). Powdered stone is difficult to contact the pipe wall directly by the reinforcing rib, and can also play a role of protecting the pipe wall.

  (C) shows a case where the reinforcing rib has a semicircular cross section, and the reinforcing rib having a semicircular cross section has a high effect of preventing the backfill soil such as powdered stone from contacting the pipe wall and protects the pipe wall. It is possible to prevent the stress caused by the backfilling soil from being locally applied to the tube wall of the synthetic resin pipe, and the effect of dispersing the stress is high. Therefore, such a rising pipe has high strength against horizontal earth pressure and vertical earth pressure, and does not cause deformation or breakage.

  (D) shows an example of the rising pipe when the pipe wall has holes in the pipe axis direction, and 3 shows the holes in the pipe axis direction provided in the pipe wall. In this case, the shape of the hole viewed from the direction perpendicular to the tube axis is circular. The holes are arranged so that the diameter of the synthetic resin pipe coincides with the symmetry axis of each hole cross-sectional shape. Moreover, each hole is arrange | positioned at the tube wall so that the symmetry axis of each hole may become the position which equally divided the central angle of the synthetic resin pipe | tube. In this case, the number of holes is 24, and each hole is arranged at a position obtained by dividing the central angle into 24 equal parts. Similar to the above-mentioned reinforcing rib, it prevents the stress caused by backfilling soil from being applied locally, disperses the stress, and the riser has high rigidity against radial deformation due to horizontal earth pressure, and is suitable for vertical soil. This is a desirable arrangement because of its high strength against pressure, and does not cause deformation or breakage.

  FIG. 4 is a plan view seen from a direction perpendicular to the tube axis showing an example of the construction of the riser structure of the synthetic resin manhole of the present invention. When a synthetic resin manhole 2 is installed where a vehicle or the like passes, a base 6 is embedded around the upper end of the riser 1 so that the inner lid is not damaged. There is a case where it is placed to cover the upper surface of the inner lid. The upper surface of the protective frame is provided so as to be flush with the ground.

  In this case, when viewed from above the upper end of the riser 1, the riser 1 of the synthetic resin manhole of the present invention has a reinforcing rib 12 that functions as a guide in the pedestal 6 in the construction. This shows that the resin tube 11 is easily arranged in the center of the base 6. Reference numeral 7 denotes an inner lid.

  FIG. 5 is a plan view seen from a direction perpendicular to the tube axis showing an example of the construction of the riser of a conventional synthetic resin manhole. When viewed from above the upper end of the riser pipe A, when a conventional synthetic resin pipe is used as the riser pipe A, there is no reinforcing rib in the construction, so it is placed in the center of the synthetic resin pipe in the base 6. It is difficult.

  Since the present invention is constituted as described above, after the crushed stones 5 and the like are placed around the manhole 2 made of synthetic resin and the riser 1 and backfilled, the crushed stones 5 and the like are squeezed for consolidation. Even if non-uniform horizontal stress acts on the outer peripheral surface of the riser tube 1 when applied, the riser tube 1 is not deformed into a flat shape by the reinforcing ribs 12 or the through holes provided in the riser tube 1. The degree is kept. In addition, the reinforcing rib 12 or the through hole expresses a high strength against vertical earth pressure, and the rib may be damaged as in the case of using a conventional ribbed plastic pipe having a rib in the circumferential direction. It does not occur and the use of a protective material or the like is unnecessary, and the cost is not increased.

It is a fragmentary sectional view which shows an example of the construction using the riser of the synthetic resin manhole of the present invention. It is the front view seen from the direction parallel to the pipe axis of an example of the riser pipe of the synthetic resin manhole of the present invention. (A) (b) (c) (d) is sectional drawing orthogonal to the pipe axis of an example of the riser of the synthetic resin manhole of the present invention. (A): It is sectional drawing perpendicular to a pipe axis which shows an example of the structure of a riser pipe. (When the reinforcing rib has a rectangular cross section.) (B): It is a cross-sectional view perpendicular to the tube axis showing an example of the structure of the riser tube. (When the reinforcing rib has a rectangular cross section.) (C): It is a cross-sectional view perpendicular to the pipe axis showing an example of the structure of the riser pipe. (When the reinforcing rib is a part of a circular cross section.) (D): A cross-sectional view perpendicular to the tube axis showing an example of the structure of the riser tube. (When there is a hole in the tube wall.) It is the top view seen from the direction at right angles to a pipe axis which shows an example of the construction of the riser pipe of the synthetic resin manhole of this invention. It is the top view seen from the direction at right angles to a pipe axis which shows an example of the construction of the riser pipe of the conventional synthetic resin manhole.

Explanation of symbols

1: Rise pipe 11: Synthetic resin pipe 12: Reinforcement rib 2: Synthetic resin manhole 21: Rise pipe receptacle of synthetic resin manhole 3: Pipe with circumferential rib 4: Rubber packing 5: Crushed stone 6: Base

Claims (2)

  A synthetic resin manhole characterized in that a riser pipe connected to an upper portion of a synthetic resin manhole embedded in the soil is composed of a synthetic resin pipe having a reinforcing rib continuous on the outer peripheral surface in the pipe axis direction. A synthetic resin manhole characterized in that a rising pipe connected to an upper portion of a synthetic resin manhole embedded in the soil comprises a synthetic resin pipe having a continuous hole in the pipe axis direction in the pipe wall.

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