JPS62236308A - Installation of telephone cable duct pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a piping method for a duct pipe for telephone cables, and more particularly to a piping method for fixedly connecting the duct pipe to the opening of a manhole.

(Prior Art) Conventionally, in construction work for burying duct pipes for telephone cables along a predetermined course, manholes M are buried at predetermined intervals along the predetermined course, as shown in FIG. 6, for example. Each manhole M has an opening M on both sides of its lower part.
A has been completely formed, and a plurality of duct pipes for telephone cables are connected to the opening Ma of the manhole M along the groove dug by the oven cut method.

This duct pipe is one in which an appropriate number of pipes, such as 3 to 6 pipes, can be piped in parallel, and it is connected to the opening Ma of the manhole M via a duct sleeve S, and the connection part of this duct sleeve S is waterproof. It can be fixed with concrete B. Details of the connection state are shown in FIGS. 7 and 8.

In FIGS. 7 and 8, the opening Ma of the manhole M
On the other hand, there are two steel duct pipes D + below,
D+ is piped, hard vinyl duct pipes D2, D are piped above the duct pipes D+ and D+ in parallel, and four wooden duct pipes DI are connected to the manhole opening Ma.
D+, Da, and Dz are connected, and: ro.

Duct sleeves St, St are fitted into the respective duct pipes, D, from the opening Ma side of the manhole, and rubber seals R or pl! It is fixed by etc.

This duct sleeve S is attached to the manhole opening Ma.
In order to fix ,,S, in a completely waterproof manner, an inner formwork U made of square plate material is installed on the opening Ma side of the manhole to seal the opening Ma. An outer formwork O is installed parallel to the inner formwork U at appropriate intervals.

Moreover, each duct sleeve S1. In order to maintain St at appropriate intervals, a vertical interval terminal seat T for regulating the vertical interval and a horizontal interval terminal seat Y for regulating the horizontal interval are installed on the outside of the inner formwork U, respectively. Inner formwork U and outer formwork 0 are held at a predetermined interval by terminal seats T and Y.
Waterproof concrete B is poured between each duct pipe,
, D, are fixed to the opening Ma of the manhole at a predetermined interval via respective sleeves S, , S,.

(Problems to be solved by the invention) In the above conventional piping method, the manhole opening M
When pouring waterproof concrete B on the outside of a, in order to make the waterproof concrete B dense in order to prevent water leakage into the manhole opening Ma,
Waterproof concrete B is poured while tamping. During the tamping of this concrete, each terminal
and Y may be distorted due to vibration etc., causing each duct pipe DI, D* and duct sleeve S1. The waterproof concrete B may solidify without accurately maintaining the predetermined intervals of each duct pipe D1. D! There was a problem in that the distance between the two was not maintained accurately.

(Means for Solving the Problems) The present invention has been devised in view of the problem described in 1. When a plurality of duct pipes are connected and fixed to the opening of a manhole, the intervals between each duct pipe can be accurately adjusted. The purpose is to provide a piping method for duct pipes that can be maintained and fixed with waterproof concrete. Outside the opening (near the lull), face the tip of a duct pipe that will serve as a floating reference placed in a trench dug along a predetermined course, and make sure that the tip of the duct pipe reaches inside the opening of the manhole. A cylindrical duct sleeve of desired length is inserted into the duct sleeve, and the tip of the duct sleeve is in close contact with the inner wall of the tip of the duct pipe from the opening side of the manhole, and the other end is in close contact with the inner wall of the tip of the duct sleeve on the opening side. After fitting a holding stopper that can be used, and fixing a holding formwork formed in a predetermined size and shape so as to contact the tip of the duct sleeve from the opening side of the manhole at the tip of the holding stopper on the opening side, A predetermined number of duct pipes are arranged in parallel one after another, and the tip of each duct pipe is fitted with a duct sleeve and a holding stopper in the same manner as described above, and a holding form is placed at the tip of each duct pipe. are fixed, and each holding form is connected from the opening side by appropriate means, so that the opening of the manhole is sealed by the plurality of connected holding forms, and the parallel spacing of each duct pipe installed in parallel is adjusted. After maintaining a predetermined interval, concrete or the like is poured from the outside of the opening of the manhole, and a plurality of duct pipes are connected and fixed to the opening of the manhole.

(Function) A duct sleeve is inserted into the tip of the duct pipe facing the outside (II) of the manhole opening buried at predetermined intervals along a predetermined course, and the duct sleeve is inserted into the inserted duct sleeve. By fitting the holding stopper from the opening side, the tip of the holding stopper will come into close contact with the inner wall surface of the duct pipe, and the other end will come into close contact with the inner wall of the tip of the duct sleeve on the opening side. The holding formwork is brought into contact with the tip of the duct sleeve from the side and fixed to the holding stopper, and in the same way, the duct sleeve and the holding stopper are fitted into the tips of other duct pipes installed in parallel, and the same is done. By rotating the holding formwork around the tip of each holding stopper, the holding formwork is connected so as to close the opening of the manhole.Then, each holding formwork is connected by appropriate means. As a result, the parallel spacing of each duct pipe is maintained at an appropriate interval by this holding formwork.Furthermore, since the opening of the manhole is closed by the continuous holding formwork, the opening of the manhole is prevented in this state. By pouring waterproof concrete on the outside of the area, each duct pipe will be connected and fixed to the manhole opening while maintaining accurate spacing.Moreover, even if the waterproof concrete is tamped considerably when poured, Since the holding formwork is firmly connected, the parallel spacing of the duct pipes does not collapse, and each duct pipe is connected and fixed to the manhole opening with accurate spacing.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figures 1 and 2 show state diagrams when the duct pipe piping method is implemented, Figure 1 is a side sectional view thereof, and Figure 2 is a front view of Figure 1 seen from the manhole opening side. .

In the figures, the same parts used in the conventional construction method are given the same reference numerals and explained.

An opening Ma penetrating the lower side wall of the manhole M is provided with the tip of a duct pipe into which a telephone cable can be placed from the outside, and a duct pipe DI made of steel pipe is provided below. In this example, two pipes are installed horizontally at a predetermined interval, and above them are parallel hard vinyl duct pipes D.
Two pipes 2 are installed horizontally at a predetermined interval. The tip of each duct pipe, D, is connected to the duct sleeve S1. S! are fully inserted into each other.

That is, the inner diameter of the tip of each duct sleeve St, St is formed to be slightly larger than the outer diameter of each duct pipe D+, Da, and the tip of each duct sleeve S1゜S, easily connects to each duct. It can be inserted into the pipe pipe D. In addition, a rubber seal R or a wedge K is driven into the gap between each tact sleeve S, , S and each Doug 1 to pipe DI, Dt to prevent rattling.

The inner diameter of the other end of each duct sleeve S, , S is approximately the same as the inner diameter of each duct pipe Dt, Da. These duct sleeves S, , S, are each duct pipe, ,
D, each duct sleeve S when inserted inside
, , S are inserted into the opening Ma of the manhole.

A holding stopper 1 is fitted into each of the duct sleeves S, , S from the opening Ma side. That is, the tip portion of the holding stopper 1 is in close contact with the inner wall of each duct pipe D11DI, and the other end portion of the holding stopper 1 is in close contact with the inner wall of the end of each duct sleeve St.

At the end of each holding stopper 1 on the side of the opening Ma, a holding frame 2 formed in a square shape is fastened and fixed by thumbscrews 4. Moreover, the abutting surfaces of each holding form 2 with respect to the holding stopper 1 are connected in a flat plate shape, and each holding form 2 can be firmly connected with the clip 3. Therefore, the opening Ma of the manhole is closed by the continuous holding forms 2, and the horizontal and vertical intervals between the duct pipes D+ and Di are maintained accurately.

In this state, the outer formwork 0 is installed at the tip of each duct sleeve S, , S, and the holding formwork 2 is connected to this outer formwork 0.
Waterproof concrete B is poured in between, and the waterproof concrete is solidified while being tamped. In addition, F in the figure is the foundation stone.

The details of the holding formwork 2 shown in FIGS. 1 and 2 will be explained with reference to FIG. 3.

This holding frame 2 is formed in advance into a predetermined shape according to the opening area of the manhole opening Ma. For example, when four duct pipes are connected to the manhole opening Ma, The flat plate part 2b is formed in an area shape of % of the area of the flat plate part 2b, and the flat plate part 2b is usually formed in a square flat plate shape, and a gong 11 plate 2a is adhered to the outer wall surface of the flat plate part 2b. Edge plates 2c and 2d for reinforcing the flat plate part 2b are formed at the rear of the peripheral edge of the flat plate part 2b. That is, the edge plate 2c located on the left and lower side in FIG. 3(a) is the flat plate part 2.
It is erected and fixed in a bent shape backwards from b,
On the other hand, the inclined edge plate 2d located on the right and upper side of the figure is formed to be inclined rearward. That is, this holding formwork 2 is formed into a valve shape as a whole. Moreover, the flat plate part 2b
Inside'i 1lII% Fit<C: 4 will be described later, 1-6 7'l: 1. (-y/< 1 (7) A center hole 2f that can pass through the core body 1 is bored.The edge plate 2C erected on the left side and the bottom side of the screen has a hole of 3.
Clip holes 2e are drilled, and the end of a steel clip 3 can be inserted into each clip hole 2e.

Four holding forms 2 formed in this way can be arranged in a row in a flat plate shape, and when they are arranged in a row, the edge plates 2c of each holding form 2 are brought into contact with each other, and the holding forms 2 provided on the edge plates 2c are brought into contact with each other. The clips 3 are inserted into the clip holes 2e, and the four holding formworks 2
are firmly connected (see Figure 2).

Next, details of the holding stopper 1 will be explained based on FIGS. 4(a), (b), and (c).

This holding stopper 1 has a rod-shaped core 1a in the center, an outer cylinder 1d fitted onto the core 1a, and a truncated conical cross section at the left end of the core 1a in the drawing. The suppressing plate 1b, which is trapezoidal and has a circular outer periphery, is completely fixed by welding or the like. The suppression plate 1b is also installed at the left end of the outer cylinder 1d in an opposing manner, and this pair of suppression plates 1b
, 1b, four rubber ring ICs made of rubber are arranged concentrically with the suppression plate 1b. On the other hand, a similar pair of suppression plates 1e and le are arranged at the right end of the core body 1a, and two rubber rings 1c are arranged between the pair of suppression plates 1e and le. In addition, a nut 1f that can be screwed into a male screw threaded on the right end of the core body 1a is in contact with the inner side of the right end suppression plate 1e, and a washer 1g is arranged on the right side of this nut 1f. 1g of this washer
A wing nut 4 is threaded on the outside. Therefore, by tightening the nut 1r against the core body 1a, the pair of suppression plates lb, lb and le are removed.

The rubber ring 1c that is interposed between 1 and 1 is pressed, and the outer periphery of the rubber ring 1c extends outward. Therefore, when fitting the holding stopper 1 into the duct pipes D+, Dt and the duct sleeves S, S, shown in FIG. The duct sleeves St, will come into close contact with the inner wall surfaces of St. The tight state can be strengthened by screwing the nut 1r.

In addition, the wing nut 4 has a core body 1a that is aligned with the center hole 2 of the holding frame 2.
This wing nut 4 is attached to the core body 1a in a state protruding from r.
By screwing into the holding frame 2, the holding formwork 2 can be installed in a pressing manner on the pressing plate 1e at the right end.

Using such a holding formwork 2 and holding stopper 1,
Figure 5 (a) shows the procedure for connecting to the state shown in Figure 1.
The explanation will be based on (b), (c), (d), and kuho).

First, a duct pipe D1 serving as a reference is installed near the bottom of an oven-cut groove with respect to the opening Ma of the manhole M placed therein via a wooden stand W (FIG. 5(A)).

Duct pipes serve as this standard.

Attach the duct sleeve SL to the tip of the duct with the specified dimensions (Fig. 5 (b)). Thereafter, the holding stopper 1 is fitted into the duct pipe D1 and the duct sleeve S from the opening Ma side of the manhole (FIG. 5(c)). Next, the holding form 2 is attached to the tip of the attached holding stopper 1, and the wing nut 4 is tightened to fix the holding form 2 to the holding stopper 1 (FIG. 5(d)). Next, the duct pipe D2 is placed above the reference duct pipe at an appropriate distance. Similarly, for the tip of this duct pipe, the duct sleeve S,
is attached, and further the holding stopper 1 is fitted, and the holding formwork 2 is similarly fixed to the tip of the holding stopper 1. After all four holding forms 2 are attached in this way, the holding forms 2 are connected using clips 3 (FIG. 5(E)). In this state, as shown in FIG. 1, an outer formwork 0 is installed, waterproof concrete B is poured, and the connection and fixation of each duct pipe D+ and Da to the manhole opening Ma is completed.

As mentioned above, in the duct pipe piping method of this example, a plurality of duct pipes, , D,
When connecting and fixing, by inserting the holding stopper 1 into the floor through the duct sleeve S, and fixing the holding formworks 2t and □1゛ to the tip of this holding stopper 1, and connecting each holding formwork 2. , each duct pipe D1. D
After securing the arrangement spacing a, waterproof concrete B is poured and the construction is completed, so that the spacing between each duct pipe can be maintained accurately.

(Effects of the Invention) In the piping method for a telephone cable duct pipe of the present invention, a manhole is buried along a predetermined course at predetermined intervals near the outside of an opening penetrated through the lower side wall of a manhole. The tip of a duct pipe that will serve as a reference is placed in the groove dug along the groove, and a cylindrical duct sleeve with a length that can reach the opening of the manhole is inserted into the tip of the duct pipe. a holding stopper whose tip is in close contact with the inner wall of the tip of the duct pipe from the opening side of the manhole and whose other end is in close contact with the inner wall of the tip of the duct sleeve on the opening side, is fitted into the duct sleeve; After fixing a holding frame formed in a predetermined size and shape to the tip of the duct sleeve from the opening side of the manhole so as to contact the tip of the duct sleeve from the opening side of the manhole, a predetermined number of duct pipes are successively attached to the reference duct pipe. are arranged side by side, a duct sleeve and a holding stopper are fitted into the tip of each duct pipe in the same manner as described above, and a holding form is similarly fixed to the tip of each duct pipe, and each holding form is opened by an appropriate means. After connecting from the side, sealing the opening of the manhole with a plurality of connected holding forms and maintaining the parallel spacing of the duct pipes arranged in parallel at a predetermined interval, the manhole opening is closed from the outside of the manhole opening. By pouring concrete, etc., and connecting and fixing multiple duct pipes to the manhole opening, the multiple duct pipes are connected and fixed to the manhole opening with appropriate spacing. This has the effect of making the construction work more accurate.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention, FIG. 1 is a side cross-sectional view showing the state of connection of a plurality of duct pipes to the manhole opening, and FIG. 2 is a side sectional view of the manhole opening side of FIG. 1. Figure 3 (a) is a front view of the holding formwork, Figure 3 (b) is a right side view of Figure 3 (a), Figure 3 (c) is a front view of the holding formwork, and Figure 3 (c) is a front view of the holding formwork.
Left side view of Prisoner 1 (A), Figure 3 (D) is a plan view of Figure 3 (A), Figure 3 (E) is a bottom view of Figure 3 (A), Figure 4 (A) is a front view of the holding stopper, and Figure 4 (b) is the fourth
Figure 4 (C) is the right side view of Figure 4 (A), Figure 5 (A), (B), (C), (D), (E) is the left side view of Figure <A). A state diagram showing the piping connection procedure of the duct pipe, FIGS. 6 to 8 show the conventional example, FIG. 6 is an explanatory diagram showing the state of connection between the manhole and the duct, and FIG. 7 is a detailed side view of the state of connection. The sectional view, FIG. 8, is a front view of FIG. 7. M... Manhole Ma... Opening, D!
... Duct pipe St, St ... Duct sleeve B ... Waterproof concrete 0 ... Outer formwork 1 ... Holding stopper 1a ... Core body lb, le ... Suppression plate

Claims (1)

[Claims] The tip of a duct pipe that serves as a reference is placed in a groove dug along a predetermined course near the outside of an opening penetrated through the lower side wall of a manhole buried at predetermined intervals along a predetermined course. A cylindrical duct sleeve with a length that can reach the opening of the manhole is inserted into the tip of the duct pipe, and the tip of the duct sleeve is inserted into the duct sleeve from the opening side of the manhole to the tip of the duct pipe. A holding stopper that is in close contact with the inner wall and whose other end can be in close contact with the inner wall of the opening side tip of the duct sleeve is fitted, and the holding stopper is fitted so that the opening side tip of the holding stopper contacts the tip of the duct sleeve from the opening side of the manhole. After fixing a holding mold formed into a predetermined size and shape, a predetermined number of duct pipes are successively arranged in parallel to the reference duct pipe, and a duct sleeve is attached to the tip of each duct pipe in the same manner as above. A plurality of holding molds connected to the opening of the manhole are formed by inserting a holding stopper, fixing a holding form to the tip thereof, and connecting each holding form from the opening side by appropriate means. After sealing off the manhole with a frame and maintaining the parallel spacing between the parallel duct pipes at a predetermined interval, concrete, etc. is poured from the outside of the manhole opening, and multiple duct pipes are connected to the manhole opening. A piping method for a telephone cable duct pipe, characterized in that the connection is fixed.