JP2004282891A - Structure of connection between conduit for communication and hand hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of connection of a conduit for communication to a hand hole, wherein a maximum number of sheathing tubes can be inserted into a through hole of a certain area formed in a hand hole and the sheathing tubes can be increased in number by relatively a simple work. <P>SOLUTION: A duct sleeve for main body tube into which a main body tube can be inserted so that the body tube can be slid and which has a tube receiving hole, whose bottom is a stepped face is fixed in the hand hole. A plurality of duct sleeves for sheathing tubes into which respective sheathing tubes are inserted so that the sheathing tubes can be slid are bundled, and one end of the bundle is bound. The tube end portion of the bundle of the duct sleeves for sheathing tubes is inserted into the duct sleeve for body tube. The body tube is inserted into the duct sleeve for body tube so that the body tube can be slid. Individual sheathing tubes are inserted into the individual duct sleeves for sheathing tubes so that the sheathing tubes can be slid. The binder for biding the bundle of the duct sleeves for sheathing tubes is disposed between the tube end face of the body tube and the stepped face at the bottom of the duct sleeve for body tube so that the binder can be moved therebetween. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of inserting a plurality of sheathed tubes into which a cable for optical communication has been inserted into a large-diameter main body pipe, and connecting a communication pipe having the main body pipe buried underground to a handhole.
[0002]
[Prior art]
In recent years, a large-diameter synthetic resin tube buried underground, that is, a so-called main tube, is inserted into a plurality of small-diameter synthetic resin tubes through which an optical communication cable is inserted, that is, a so-called sheath tube. 2. Description of the Related Art Information communication is carried out by constructing a network using an optical communication cable as a communication conduit. Since the method using the main pipe can lay a large number of optical communication cables in a small cross-sectional area, there is an advantage that the labor for excavation and the like can be reduced, and thus the construction period can be shortened and the cost can be reduced. In recent years, it has been increasingly adopted.
[0003]
Usually, in such an optical communication conduit, a point where necessary work such as inspection of an installed optical communication cable, connection and branching with an separately installed optical communication cable, or change of the installation direction is performed. Is provided with a handhole.
[0004]
As a method of connecting the optical communication conduit to the handhole, a fixing plate is usually fixed to a through hole provided in a side wall of the handhole, and a sheath tube inserted in the communication conduit connected to the fixing plate is usually used. The same number of through-holes are provided in each through-hole, and pod-tube fixing fittings are fixed in each through-hole so that the pod tube is inserted into the pod and the tube receptacle faces outward from the handhole. It is common to insert pods and connect them.
[0005]
As an example of this, the outer pipe is attached to the connection hole of the handhole side wall so as to be movable inward of the handhole in a watertight state, and the inner pipe fixing plate is fixed to the tip of the outer pipe. 2. Description of the Related Art There is known a connection structure between a pipe and a handhole in an information box pipe in which an inner pipe is fixed (for example, see Patent Document 1).
[0006]
In the method of Patent Document 1, an inner pipe sleeve duct is attached to an inner pipe fixing plate, and the inner pipe is slidably inserted into the sleeve duct. In order to attach the inner pipe sleeve duct to the inner pipe fixing plate, a certain interval is required between the sleeve ducts, and therefore, a fixed area fixed plate attached to the connection port opened in the hand hole is required. Has a limitation on the number of sleeve ducts that can be provided.
[0007]
Therefore, the number of pods connected per unit area of the fixing plate is limited, and in order to increase the number of pods connected, it is necessary to replace the pod with a large-diameter fixing plate. In other words, when adding pods at a later date, it is not possible to add more than the number of duct sleeves opened in the fixing plate, and the number of pods per unit cross-sectional area is limited by the fixing plate. It is necessary to replace the plate with a fixed plate with a large number of strips, so it is necessary to open a large through hole in the handhole wall, and large-scale reinforcement is required to secure the strength of the handhole wall. This causes a problem that the construction period and the construction time are increased, and it is practically difficult to implement the construction.
[0008]
[Patent Document 1] Japanese Patent Application No. 2000-186336
[0009]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems of the conventional technology, and can insert a maximum number of pods into a through-hole having a fixed area formed in a handhole, and can perform pods with relatively simple construction. The purpose of the present invention is to provide a connection structure for connecting a communication pipeline to a handhole, which can be added.
[0010]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a connecting structure for connecting a communication line to a handhole according to the first aspect of the present invention, wherein a plurality of sheaths each having an optical communication cable inserted therein have a large diameter. A connection structure between a communication conduit inserted into a pipe and buried therein and a handhole, wherein a pipe receiving port in which a main body pipe can be slidably inserted and a back portion has a stepped surface is provided on a side wall of the handhole. A duct sleeve for a main body pipe is fixed so that a pipe receiving port faces the outside of the handhole, and a plurality of pod pipe sleeves into which the pod pipes are slidably inserted are bundled and one end thereof is bound. The tube ends of the bundled sheath tube bundle are inserted into the main tube duct sleeve, and the main tube is slidably and watertightly inserted into the main tube duct sleeve. A binding device slidably inserted into the sheath tube duct sleeve and binding the sheath tube duct sleeve bundle is disposed between the tube end surface of the main tube and the stepped surface of the back portion of the main tube duct sleeve. , And is movable between them.
[0011]
The invention according to claim 2 (invention 2) is characterized in that the number of sheath tubes to be bound is the maximum number that can be inserted into the main pipe, and the communication pipeline and the handhole according to invention 1 are connected. Structure.
[0012]
The sheath tube used in the present invention may be any tube having an optical communication cable inserted therein and having a function of protecting the cable, for example, a general heat-resistant material such as polyvinyl chloride, polyethylene, polypropylene, and polybutene. A plastic resin pipe or a fiber-reinforced thermosetting resin pipe may be used, but a polyvinyl chloride pipe is preferable in terms of ease of construction work and low cost.
[0013]
The main body pipe has a plurality of sheath pipes inserted therein and is buried underground to form an optical communication pipeline, and is used in a pipe having excellent water resistance, pressure resistance and corrosion resistance. For example, as an example, thermoplastic synthetic resins such as polyvinyl chloride, polyethylene, polypropylene, and polybutene; inorganic or organic fibers such as glass fiber, carbon fiber, drawn resin fiber, and liquid crystal resin fiber; and thermosetting resin or thermosetting resin. A tube made of a fiber reinforced synthetic resin (FRP) used in combination with a plastic resin; resin concrete (FRPM) or the like is used.
[0014]
The insertion state of the sheath tube into the main body tube is usually such that a plurality of sheath tubes are inserted into the main body tube in a close-packed state. At this time, all the sheaths may have only the same outer diameter or different sheaths. Also, usually, fixed-length pods are connected by fittings and inserted into the main pipe, so even if multiple pods are bundled and packed in a close-packed state, the maximum outer diameter is at least the thickness of the fitting. Is smaller than the inner diameter of the main body tube. That is, the sheath tube itself is inserted into the main body tube with a gap between the sheath tubes. Further, the sheath tube may be inserted with a gap left in the main tube so that a new sheath tube can be inserted later when necessary.
[0015]
In the present invention, the handhole refers to a manhole provided in a pipeline for connecting, joining, or branching an optical communication cable, or for inspection. A through-hole is provided in the side wall of the handhole, and a duct sleeve for a main pipe (hereinafter abbreviated as a main pipe DS) to which an end of the main pipe is connected is fixed to the through-hole. The handhole is usually made of RC (Reinforced Concrete) or FRPM, etc., and the main pipe DS is fixed to a predetermined position on the side wall of the handhole in advance and is carried into the installation site. However, when the handhole is large or the like, the body pipe DS may be attached by performing concrete pouring at the installation site or burying an FRPM handhole and making a predetermined hole in the side wall thereof.
[0016]
The main body tube DS is not particularly limited as long as it is excellent in burial resistance, water resistance, and corrosion resistance. For example, thermoplastic synthetic resins such as polyvinyl chloride, polyethylene, polypropylene, and polybutene; glass fiber, carbon Fiber-reinforced synthetic resins using composites of inorganic or organic fibers such as fibers, drawn resin fibers, liquid crystal resin fibers, etc. and thermosetting resins or thermoplastic resins; resin concrete, stainless steel, and corrosion resistant Metals such as iron are used.
[0017]
The pipe receiving port of the main pipe DS may be of a general seismic separation prevention structure, and is not particularly limited. For example, as an example, the main body tube insertion port, i.e., the tube receiving port is provided with an anti-seismic separation using a rubber ring or the like for waterproofing so that the main body tube can slide and prevent water from entering from outside. And the like.
[0018]
The inside of the tube receiving port of the main body tube DS is a stepped surface. The stepped surface restrains the movement of the sheath tube so that the side surface (described later) of the tying member that binds the sheath tube duct sleeve (described later) abuts and the sheath tube DS does not move further to the handhole side. ing. That is, the depth of the concave groove formed by the stepped surface, the inserted pipe end surface of the main pipe, and the inner peripheral surface of the pipe receiving port of the main pipe DS is such that the tying tool (described later) is stored therein and the stepped surface or The depth is such that the side surface of the tying tool hits the pipe end face of the inserted main body pipe.
[0019]
In the present invention, the sheath tube duct sleeve (hereinafter, abbreviated as sheath tube DS) is a duct sleeve to be attached to an end of the sheath tube through which a communication cable is inserted and inserted into the main body tube, When the end of the sheath tube is inserted and the sheath tube thermally expands and contracts, it slides inside the sheath tube.
[0020]
A plurality of sheath pipes DS are bundled together, the pipe ends are bound by a binding tool, and are in a state where they can be regarded as one. The binding device is a stainless steel binding belt that winds and binds the entire sheath tube DS bundle, and is disposed between the binding belt and the sheath tube DS to prevent the sheath tube DS from being damaged and to prevent the sheath tube DS from being damaged. It consists of a rubber plate that contacts the attachment surface and a fastener that fastens both ends of the binding belt. Note that the end of the sheath tube DS refers to a position from the binding position of the sheath tube DS to the tip of the sheath tube DS.
[0021]
The number of binding points may be one at the end of the sheath DS bundle, but if the main body tube is thick or the number of sheaths DS to be bound is large, two or more locations are bound. You may. Also, if the sheaths DS are bundled after sandwiching a double-sided tape, for example, between the sheaths DS, the individual sheaths of the sheathed sheath DS bundle become less slippery, and the sheath sheath DS bundle as a whole is more firmly integrated. It can be regarded as a state.
[0022]
The both ends of the binding belt may be wound around the sheath DS bundle via a rubber plate and fastened with bolts and nuts or so-called patch fasteners. That is, a double-sided tape is wound around the outer circumference of the sheath tube DS to prevent or reduce the displacement of the sheath tube DS by the sheath tube sliding inside due to thermal expansion or contraction. Secure the sheaths with double-sided tape, wrap a rubber plate around the outer periphery of the fixed sheath DS bundle, wrap a stainless steel belt tie from above the rubber plate, and tighten the tie with a fastener to fix it. It should just be equal.
[0023]
The tie protrudes high from the apparent maximum outer surface of the sheath DS bundle by the sum of the thickness of the wound rubber plate, the thickness of the stainless steel tie belt, and the height of the fastener. It is better that the height of the tying tool is low, but if the tying tool is arranged so as to be located in the gap between adjacent tubes or pipes DS and fits into the gap, the protruding height by that amount Becomes lower. Therefore, if the width is small and it is large enough to fit between adjacent pipes or pipes DS, there may be some height, but of course there is a limit. Needless to say, it should be appropriately changed depending on the outer diameter.
[0024]
In the invention 2, the number of bundles of the sheath tube DS is set to the maximum number that can be inserted into the main body tube in advance. Therefore, when laying the pipeline, insert only the required number of sheaths into the main pipe at that time, and when adding the sheath at a later date, add a new sheath pipe to the main pipe. This is because it is only necessary to insert and expand the sheath, and to insert the end of the sheath that has been added into the sheath tube DS that has been bound beforehand.
[0025]
(Action)
In the present invention, a main pipe DS having a stepped surface on the inner side of the waterproof rubber ring of the pipe receiving port is fixed to a through-hole formed in the side wall of the handhole, and the plurality of sheath pipes DS are bundled. The ends of the bundle are bundled and the bundle end of the bundle of sheaths DS is inserted into the main body tube DS, and the side surface of the bundling material hits the stepped surface, and the sheaths DS bundle is no longer on the handhole side. Have been kept from moving. Therefore, since the sheath pipes DS are bound in a close-packed state, the maximum number of sheath pipes can be inserted into a through hole having a fixed area formed in the handhole.
[0026]
In addition, if the maximum number of sheath pipes DS are tied in advance to make a spare, even when the sheath pipe is added at a later date, the pipe end of the sheath tube added to the main body pipe is connected to the spare sheath pipe DS. Since it is sufficient to simply insert the pod into the pod, it is easy to add pods.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the present invention will be described with reference to the drawings. FIG. 1 is a half sectional view showing an embodiment of the present invention. In this example, the main pipe is a polyvinyl chloride resin pipe, the sheath pipe is a polyvinyl chloride pipe, the handhole is made of RC (reinforced concrete), and both the main pipe DS and the sheath pipe DS are made of vinyl chloride resin. Is used.
[0028]
A plurality of sheath pipes 3 are inserted into a main body pipe 2 of a communication pipe line 1 buried underground, and optical communication cables 41, 42, 43,. ... are inserted. A through hole 61 is provided in the hand hole 6, and a main body tube DS 7 is fixed to the wall of the hand hole 6 in the through hole 61. The main body tube DS7 is configured such that the tube receiving port 71 into which the main body tube 2 is inserted faces outward from the handhole 6. ,
[0029]
The main tube 2 is obtained by the same manufacturing method as that of a normal vinyl chloride resin tube. For example, as one example, a product produced by winding a glass fiber around a mandrel and impregnating and laminating a polyester resin mixed with silica sand or the like by a hand lay-up method, or the like can be given.
[0030]
A rubber ring 82 for waterproofing is attached to the pipe receiving port 71 of the main pipe DS7. A plurality of waterproof rubber rings 82 may be mounted as necessary. The distance from the water stopping rubber ring 82 to the tip of the pipe receiving port 71 is set to a length that does not come off according to the expansion and contraction allowance of the main pipe 2.
[0031]
A stepped surface 73 is provided on the inner side of the pipe receiving port 71 along the circumferential direction. The position of the stepped surface 73 in the axial direction is a position close to the outer surface of the handhole 6 between the outer surface of the wall of the handhole 6 and the waterproof rubber ring 72.
[0032]
Each of the sheath tubes 31, 32, 33,... Is slidably inserted into a sheath tube DS81, 82, 83,. The sheath 3 expands and contracts in the direction toward the handhole 6 and in the opposite direction due to thermal expansion and contraction. Therefore, the insertion margin of the end of the sheath tube 3 into the sheath tube DS8 does not cause the sheath tube 3 to protrude into the handhole 6 or the sheath tube 3 to fall out of the sheath tube DS8 even if the sheath tube 3 expands and contracts. Must be so. Therefore, the length of the sheath tube DS8 is equal to or greater than the length of the expansion and contraction of the sheath tube 3, and is usually arranged such that the tube end of the sheath tube 3 is located substantially at the center of the sheath tube DS8.
[0033]
However, the length of the sheath tube DS1 is preferably long in order to prevent the sheath tube from coming off. However, if the sheath tube DS1 is too long, when the sheath tube 3 moves due to thermal expansion and contraction, the sheath tube 3 outer peripheral surface and the sheath tube DS8 inner peripheral surface will be used. And the sheath tube DS8 is easily moved by a large force applied thereto, and the possibility that the tying tool 5 (described later) strongly hits the stepped surface 81 or the pipe end face of the main body pipe 2 to be damaged is increased. Therefore, it is preferable that the restriction be appropriately made according to the situation at that time.
[0034]
The sheath pipes DS8 are bundled at one end thereof with the sheath pipes DS81, 82, 83,... Being bundled together by the binding tool 5 so as to be practically united. That is, the entire sheath DS bundle is wound around, a rubber plate 51 is mounted, and a stainless steel bundling belt 52 is further wound thereon, and both ends of the bundling belt 52 are strongly fastened with fasteners 53, The sheath tube bundles are tied together so that they are virtually integral.
[0035]
The method of binding the binding belt 52 is not particularly limited, but it is necessary that the total height from the outermost side of the bundled sheath DS bundle 8 be smaller than the thickness of the tube wall of the main tube 2. In other words, this is because the bundled sheath DS bundle 3 can be inserted into the tube receiving opening 71 of the main tube DS7 in a later operation. For this reason, a device for reducing the total height is required as a binding method. For example, as an example, a method of binding the ends of the binding belt 52 with a so-called patching metal fitting, or a method of forming the binding belt 52 into a ring shape and using a rubber band or the like on all or a part of the ring to apply a rubber band. A method of bundling the ends of the sheath DS bundle 8 may be used.
[0036]
Usually, the width of the rubber plate 51 is made larger than the width of the stainless steel binding belt 52. Since the tying belt 52 is disposed substantially at the center of the rubber plate 51, the side surface of the tying member 5 becomes a rubber plate, and even if it hits the stepped surface 73 or the pipe end of the main pipe 2, it is hardly damaged.
[0037]
The bound sheath tube DS bundle expands and contracts substantially as a whole as a whole. Accordingly, the binding position of the sheath DS bundle is moved between the stepped surface 73 and the end of the main tube 2. For this reason, even if the sheath tube DS bundle receives a force to move in the direction of the handhole 6, the side surface of the tying tool 5 hits the stepped surface 73, and the sheath tube DS bundle goes further to the handhole 6 side. Absent. Further, when the tying tool 5 receives a force moving to the inside of the main pipe 2, the opposite side surface of the tying tool 5 hits the pipe end face of the main pipe 2, so that it moves further inward of the main pipe 2. I will not.
[0038]
Next, a procedure for connecting the communication pipeline to the handhole according to the present invention will be described. First, a handhole 6 fixed in advance so that the pipe receiving port 71 of the main body pipe DS7 faces the outside of the handhole 6 is created, and this is buried and installed at a laying site to be a starting handhole.
[0039]
Next, one end of the sheath tube bundle 8 in which a double-sided adhesive tape is wound around the outer periphery of each sheath tube 81, 82, 83,... Is bundled together with a rubber plate 51 and a stainless steel belt 52. Tightened by the winding fastener 53, the tube end on the side where the binding device 5 is attached is inserted into the tube receiving port 71 of the main body tube DS7, and inserted until the side surface of the binding device 5 abuts against the stepped surface 73.
[0040]
Insert the required number of sheath pipes 3 (31, 32, 33, ...) into the main body pipe 2 and insert one end thereof into the sheath pipes DS8 (81, 82, 83, ...), respectively. insert. The insertion margin is such that the insertion tip of the sheath tube is located near the center of the length of the sheath tube DS8. The length of the sheath tube DS8 is longer than the length of expansion and contraction of the sheath tube.
[0041]
For example, as an example, assuming a communication pipeline laid between handholes at a distance of 50 m, the thermal expansion and contraction length of a polyvinyl chloride sheath having a nominal diameter of 30 mmφ is approximately 21 cm. Therefore, in consideration of the construction error and the safety factor, the expansion and contraction length is often set to 30 cm or more. If a sheath tube DS with a length of 100 cm is prepared, insert the sheath tube into the sheath tube DS from the tip of the sheath to a length of 65 cm, and the sheath tube will fall out within the range of 30 cm of expansion and contraction, and the sheath tube will be inserted into the handhole. Eliminates protrusion. However, depending on the construction season, the position may be shifted to the handhole side or the opposite direction, and may be changed as appropriate.
[0042]
Next, one end (tube insertion port) of the main body pipe 2 is inserted into the pipe receiving port 71 of the main body pipe DS7, is inserted beyond the waterproof rubber ring 72, and is inserted into the back side. It is made to reach near the side surface of the binding tool 5. Since the main pipe 2 is buried in the ground and the outer surface thereof is subjected to earth pressure, there is almost no axial movement due to thermal expansion and contraction. This is only the case, and since the pipe receiving port 71 has a structure having a seismic separation prevention function, it does not move in the direction in which the pipe end of the main pipe 2 comes off from the position of the water-stop rubber ring 72, and watertightness is maintained. It is.
[0043]
The communication pipeline 1 connected to the handhole in this way is extended by sequentially connecting the main body tube 2 and the sheath tube 3 toward the arrival side. After the communication conduit 1 is completed, the optical communication cable 4 is inserted into the sheath tube 3 using the handhole 6 on either the start side or the arrival side.
[0044]
【The invention's effect】
As described above, the connection structure between the communication conduit and the handhole according to the present invention allows a maximum number of sheath tubes to be inserted into a through-hole having a constant area formed in the handhole, and can be used for comparison. It is a structure to connect the communication pipeline to the handhole, which enables additional pods to be installed with simple construction.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Communication pipe 2 Main body pipe 3 Sheath pipes 31, 32, 33 ... Each sheath pipe 4 Optical communication cables 41, 42, 43 ... Each optical communication cable 5 Bundling tool 51 Rubber plate 52 Bundling belt 53 Fastener 6 Hand hole 61 Through hole 7 Duct sleeve for main pipe (Main pipe DS)
71 Pipe receiving port 72 Waterproof rubber ring 73 Stepped surface 8 Sheath pipe duct sleeve (Saya pipe DS)
81, 82, 83, ... each sheath tube DS

Claims (2)

A connection structure between a communication pipe and a handhole in which a plurality of pods each having an optical communication cable inserted therein are inserted into and buried in a large-diameter main body pipe,
On the side wall of the handhole,
A duct sleeve for a main body pipe having a pipe receiving port into which a main body pipe can be slidably inserted and a back portion has a stepped surface,
The pipe socket is fixed so that it faces the outside of the handhole,
A plurality of sheath tubes duct sleeves through which each of the sheath tubes are slidably inserted are bundled and one end thereof is bound,
The tube end of the bundled sheath tube bundle is inserted into the main tube duct sleeve,
The main pipe is slidably and watertightly inserted into the main pipe duct sleeve,
Individual sheaths are slidably inserted into individual sheath tube duct sleeves,
The tying tool that ties the sheath tube duct sleeve bundle,
A connection structure between a communication pipe and a handhole, which is disposed between a pipe end face of a main pipe and a stepped surface at the back of a main pipe duct sleeve, and is movable therebetween. 2. The connection structure between a communication line and a handhole according to claim 1, wherein the number of sheath tubes to be bound is the maximum number that can be inserted into the main tube.

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