JP2617160B2 - Buried pipe and construction method of buried pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buried pipe, for example, a buried pipe used in a diverted sewerage work, and a method of constructing the buried pipe.

[0002]

2. Description of the Related Art During construction of a sewer system, a drainage basin is provided at a predetermined interval for maintenance and inspection of a sewerage system, and is formed of a PVC pipe connecting a lower end to the drainage basin. One end of the buried pipe is provided at a vertical or near-vertical inclination angle so as to be exposed on the surface of the ground, and each drainage space is connected by a buried pipe made of a PVC pipe buried horizontally. Thus, in such a sewer system, buried pipes installed at a vertical or near vertical inclination angle are subjected to sediment load from all directions, as well as soil quality and load of vehicles passing therethrough, as well as rainfall and rainfall. Land subsidence at the buried site often occurs due to various factors such as improper backfill work. Due to this land subsidence, the load in the pipe axis direction acts on the buried pipe buried mainly at a vertical angle or near vertical angle by sediment, and the buried pipe descends due to the load of the sediment, so it is connected to this A strong force is applied to the drainage basin and the horizontally disposed buried pipe, causing the drainage basin and deformation or damage to the buried pipe.

[0003] In order to prevent such a drainage basin or a horizontally disposed buried pipe from being deformed or damaged, for example, Japanese Utility Model Laid-Open No.
In Japanese Patent Publication No. 0-77882, Japanese Patent Publication No. 61-22199, and Japanese Utility Model Laid-Open Publication No. 1-83988, a connection between a buried pipe provided horizontally and a buried pipe provided vertically or nearly vertically is provided in a longitudinal direction by land subsidence. There has been proposed a pipe joint that absorbs the amount of expansion and contraction of the buried pipe in the pipe axis direction.

[0004]

In each of these known pipe joint structures, the relative movement can be made within a proper range in the axial direction while maintaining the airtightness between the receiving pipe of the pipe and the insertion pipe. As a possible structure, the movement of the pipe caused by the land subsidence is absorbed by the pipe joint so as to cope with the land subsidence. However, these pipe joints have a complicated structure, and the special structure not only increases the man-hour for forming the pipe joint, but also increases the number of types of parts at the time of buried piping, thereby complicating the burial method, which increases costs. There is a problem that can not be avoided.

In view of the above situation, the present invention provides a very simple means of providing a covering member loosely in a vertically embedded buried pipe among existing buried pipes without using a pipe joint having a special structure. It is another object of the present invention to provide a buried pipe capable of preventing deformation and breakage of the pipe in response to land subsidence, and a construction method using the buried pipe.

[0006]

In order to achieve the above object, a buried pipe according to the present invention is provided on the outer periphery of a pipe member buried in soil at a vertical angle or a nearly vertical inclination angle, with the pipe member being interposed with earth and sand. When a load is applied, a covering member that descends along the pipe axis direction together with earth and sand is loosely attached.

More specifically, the outer peripheral surface of a pipe member buried in the soil at a vertical angle or a nearly vertical angle has a friction coefficient larger than at least the friction coefficient of earth and sand in contact with the buried pipe, and the friction with the pipe member. It is characterized in that a covering member having a small coefficient is loosely attached.

In addition, the method for constructing a buried pipe according to the present invention is characterized in that when a load acts on the outer peripheral surface of a buried pipe buried in the soil at a vertical angle or a nearly vertical inclination angle through a soil to the pipe member, After loosely attaching the covering member that descends along the pipe axis direction, burying pipes are arranged at the site to be buried, and then backfill the earth and sand so that the covering member does not descend along the burying pipe. It is characterized by the following.

In the present invention, the covering member to be loosely attached to the outer peripheral surface of the pipe member is any one of a film, a sheet, and a net, which is appropriately selected depending on the soil properties of the place where the pipe is to be embedded. Specifically, a slippery synthetic resin film such as polyester or polypropylene, or a nonwoven fabric made of these, or a woven fabric such as dongolos, or even a braided net to form a nonwoven fabric or woven fabric In such a case, a material having good water permeability is particularly preferable.

[0010]

The buried pipe of the present invention descends along the pipe axis direction together with the earth and sand when a load acts on the outer peripheral surface of pipes which are piped at a vertical angle or a nearly vertical inclination angle through soil and sand. Because the covering member is loosely attached, the soil around the buried pipe comes into contact with the buried pipe via the covering member. The load does not act on the buried pipe.

According to the method of constructing a buried pipe of the present invention, the covering member is loosely mounted on the outer peripheral surface of the buried pipe buried in the soil at a vertical angle or a nearly vertical inclination angle, and then the buried pipe is arranged at a portion to be buried. However, damage to the buried pipe buried in the vertical direction due to land subsidence can be prevented by a very simple means of backfilling the earth and sand so that the covering member does not descend along the buried pipe.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a buried pipe according to the present invention and a method for constructing the buried pipe will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a drainage mass mechanism 1 constituting a part of a small-scale sewerage system, for example. The drainage mass mechanism 1 is provided with branch pipes 4a at connection ends 3a, 3b located at positions opposite to the mass body 3 having three connection ends 3a, 3b, and 3c at a lower portion for flowing drainage from two directions in one direction. , 4b, and a main pipe (not shown) is securely connected to the connection end 3c, and the lower end of the buried pipe 2 is vertically and securely mounted on the upper part of the mass body 3; An inner lid 5 having a handle 6 is detachably attached to the upper end opening of 2 to serve as an inspection port.

On the upper part of the inner lid 5 of the buried pipe 2, along the inner peripheral edge of a ring-shaped anti-sinking plate 7 having a certain width,
A protective cover 8 having a frusto-conical shape with an openable and closable lid 8a provided on the upper surface thereof is provided, and the anti-settling plate 7 is placed on earth and sand 10 in which the anti-subsidence plate 7 is embedded. 2 is provided so as to cover the upper portion of the protective cover 8, and the earth and sand 10 support the lower surface of the anti-sinking plate 7 so that the lid 8a on the upper surface of the protective lid 8 is at the same level as the ground surface. .

The buried pipe 2, inner lid 5, mass body 3 and branch pipes 4a, 4b constituting the drainage mass mechanism 1 are made of a synthetic resin such as hard vinyl chloride resin. The protective cover 8 is made of cast iron, synthetic resin, or the like.

In the drainage mass mechanism 1 having such a configuration, the covering member 9 of the buried pipe 2 which is vertically or vertically attached to the mass main body 3 can be lowered along the pipe axis direction on the outer peripheral portion thereof. It should be installed loosely as possible.
This covering member 9 basically uses a slippery synthetic resin film made of polyester or polypropylene. In the embodiment, a polypropylene film is brought into contact with the mass body 3 from the upper end edge of the buried pipe 2. It covers the lower edge, is not tightly bound to the buried pipe 2, is relatively loosely wound, and is temporarily fixed to the outer surface of the buried pipe 2 by an adhesive tape or the like so as not to be detached during the construction work. .

When the earth and sand around the buried pipe 2 is a lot of clay or sand, the covering member 9 can be suitably used as a net formed by braiding using a synthetic resin material. In the case of general soil, a film can sufficiently cope with the problem. In the case of a woven or non-woven fabric made of synthetic resin, a water-permeable material is preferable, and the longer the length of the buried pipe 2, the more effective.

The drainage mass mechanism 1 having such a configuration is buried by arranging it in the excavated soil, connecting each part in a predetermined manner according to a conventional method, and then burying the earth and sand 10 and compacting it appropriately. But the mass body 3 and the branch pipes 4a, 4b
Are arranged in a relatively stable state with less land subsidence because the lower part is disposed on the original ground without excavation.

On the other hand, a load in the lateral direction (in the direction of arrow a) of the backfilled earth and sand 10 acts on the outer periphery of the buried pipe 2 buried vertically or vertically, whereby the buried pipe 2 is supported. ing. However, if land subsidence occurs due to, for example, defective backfilling work after backfilling, the earth and sand 10 moves downward with the load applied to the buried pipe 2 in the direction of arrow a. (In the direction of arrow b), the covering member 9 made of a synthetic resin film is temporarily fixed to the outer peripheral surface of the buried tube 2. In addition, since the covering member 9 has extremely good lubricity with respect to the buried pipe 2, a load of earth and sand does not directly act on the buried pipe 2. Therefore, although the earth and sand 10 descends together with the covering member 9, the load of the earth and sand does not directly act on the buried pipe 2, and the earth and sand do not descend while maintaining the buried state. In addition, a small load due to vibration of a vehicle running on the road or the like does not exceed the mounting strength of the fixing member that temporarily fixes the covering member 9 to the outer periphery of the buried pipe 2.
The sediment sinks down along the covering member 9, and the load does not directly affect the buried pipe 2.

In the above embodiment, the soil of the burial place is described as a normal one. However, when the soil of the burial place is clayey or sandy, the covering member has water permeability, and Preferably, a woven net is used. In joining the buried pipe and the drainage mass, a conventionally known mechanism may be used for the joint.

[0020]

According to the buried pipe of the present invention, since the covering member is temporarily fixed to the outer peripheral surface of the buried pipe which is buried at a vertical angle or a nearly vertical angle, a load acts on the buried pipe by land subsidence. Even so, the load is absorbed by the covering member,
Because the covering member descends along the pipe axis along with earth and sand,
Since the load of earth and sand does not act on the buried pipe buried at a vertical angle or a nearly vertical inclination angle, it is possible to prevent deformation or damage of a drainage mass or the like due to the descending of the buried pipe. In particular, since the present invention has a very simple structure in which the covering member is temporarily fixed to the outer peripheral portion of the buried pipe, it has a great advantage in practical use, such as easy production and no increase in cost.

On the other hand, in the method of constructing a buried pipe according to the present invention, when constructing a sewer system, a covering member is temporarily fixed to an outer peripheral portion of a buried pipe to be buried in a vertical state, and then the covering member is peeled from the buried pipe at the time of burial. The extremely simple burying operation of burying the buried pipe can prevent the downward movement of the buried pipe caused by land subsidence. In particular, by using a covering member that has a large coefficient of friction for soil and sand and a small coefficient of friction for buried pipes, it can be used for all types of soil, and shortens and simplifies the construction period required to construct a sewer system. can do.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a drainage mass mechanism using a buried pipe of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drainage mass mechanism 2 Buried pipe 3 Mass main body 3a Connection end 3b Connection end 3c Connection end 4 Branch pipe 5 Inner lid 6 Handle 9 Covering member 10 Sediment

Claims (4)

(57) [Claims] When a load is applied to a pipe member through earth and sand at a vertical or nearly vertical inclination angle in the soil at a slant angle, a covering member descending along the pipe axis direction together with the earth and sand when a load acts on the pipe member via earth and sand. A buried pipe characterized by being loosely mounted. 2. A pipe member buried in the soil at a vertical or near-vertical inclination angle having a friction coefficient at least larger than a friction coefficient of earth and sand in contact with the buried pipe, and a friction coefficient with the pipe member. A buried pipe characterized by loosely attaching a covering member having a small height. 3. The coating member loosely attached to the outer peripheral surface of the pipe member is a synthetic resin film, a synthetic resin sheet, a synthetic resin or cloth nonwoven fabric or woven fabric, or a braided net. The buried pipe according to claim 1 or 2, wherein: 4. When a load is applied to a pipe member via earth and sand on the outer peripheral surface of a buried pipe buried in the soil at a vertical angle or a nearly vertical inclination angle, the coating descends along the pipe axis direction together with the earth and sand. A method for constructing a buried pipe, wherein the member is loosely attached, and then a buried pipe is arranged at a site to be buried, and then the earth and sand are backfilled so that the covering member does not descend along the buried pipe.