JPH033109B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for destroying and filling buried residual pipes.

Conventional technology and its problems When a pipe buried under a road becomes unnecessary due to replacement due to other construction work or due to replacement of aged pipes, it is desirable to remove it in principle, but due to recent road traffic conditions, In addition, due to the inconvenience caused to roadside residents due to removal work, there is currently no choice but to leave some parts in place. If such remaining pipes are left as they are, they may cause road collapse in the future due to the inflow of earth and sand into the pipes, so it is common practice to fill the remaining pipes with a filler such as cement-bentonite. .

However, since underground pipes are usually used in combination of multiple pipes, if the pipes are old, the filler material tends to leak out from the joints or cracks, resulting in waste. If the filler is in contact with a hollow space inside, there is a problem in that the filler leaks out until the space is filled, resulting in a large amount of waste.

The present invention solves the problems of the prior art and provides a method for filling left-over pipes that can be easily operated to prevent leakage outside the pipe and fill the left-over pipes with a filler to prevent the inflow of earth and sand. The purpose is to provide.

Means for Solving the Problems The object of the present invention is to widen one end edge of a flexible tube extending from the outside of the pipe to open one opening of the pipe when filling a buried remaining pipe with a filler for preventing the inflow of earth and sand. The filling material is supplied from the open end side, and the tube is inserted into the tube while being sequentially turned over by the supply pressure, and the tube is interposed between the inner surface of the tube and filled. This is achieved by a buried residual pipe filling method characterized by forming a section.

Effects and Effects According to the present invention, the filler for preventing the inflow of earth and sand is filled with a tube interposed between it and the inner surface of the remaining pipe, so that it does not leak from the joints of the remaining pipe or cracks due to aging. . Moreover, when interposing the tube in this way, one end edge of the flexible tube extending from the outside of the remaining tube is expanded, tightly supported around one open end of the remaining tube, and the tube is filled from the open end side. When the material is supplied, the tube can be sequentially turned over and inserted into the pipe by the supply pressure, and the advantage is that the supply of the filler and the insertion of the tube between the filler and the tube wall can be performed simultaneously and easily. can get.

The present invention further provides for destroying the buried remaining pipe to such an extent that it can be easily divided, and after the destruction or as the destruction progresses,
As described above, a tube may be interposed between the tube and the inner surface of the tube to form a filling portion. In this case, not only can leakage of the filler material be prevented and filling can be performed easily as described above, but even if the remaining pipe appears during some kind of excavation work, only the part that will be an obstacle to excavation can be divided. It is also possible to obtain the effect that it can be removed. Especially in this case,
If filling is performed without interposing a tube between the inner surface of the pipe and the tube, a large amount of the filler will leak out from the cracks and cracks formed by the fracture. The effects obtained by the invention are significant.

Further, the destruction can be carried out gradually in the longitudinal direction of the residual tube by a destruction device inserted from one end of the residual tube, but in this case as well, the tube is inserted and the filler is supplied from one end of the tube. Since the filling can be performed only from the side, it is possible to fill the tube at the closest position as the tube fracture progresses. This provides the advantage that the filling can be carried out after the breakage, before the breakage fragments fall off and, if necessary, dirt falls.

Air mortar, crushed stone, sand, etc. can be used as the filler, but they have good fluidity before hardening and can be pumped over long distances, and have a compressive strength of about 10 kg/cm ² after hardening. It is desirable to use a cement-bentonite grout because it has a low grout and can be easily cut and removed if it becomes a hindrance to other construction work later on. This grouting agent must have cement (including mortar) and bentonite as its main components, and the mixing ratio can be selected from a wide range, but if the ratio of cement increases too much, the strength after hardening will deteriorate. If the proportion of bentonite becomes too large, cutting becomes difficult, and if the proportion of bentonite increases too much, it may cause problems in hardening. Therefore, the mixing ratio is 100 parts by weight of cement to 100 parts by weight of bentonite.
About 50 parts by weight is preferable. In addition to such cement and bentonite, a setting accelerator, a water reducing agent, etc. can be added and mixed.

The remaining pipes to which the construction method of the present invention can be applied include various types of pipes that are normally buried, such as metal pipes such as cast iron pipes, concrete pipes, humid pipes, and asbestos pipes.

Embodiments Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

Figure 1 shows the buried state of the remaining pipes. In order to carry out the construction method of the present invention, pits B and C were dug, and the remaining pipes (indicated by two-dot chain lines in the figure) in each pit were cut and removed. , working opening ends a1 and a2 are formed. The appropriate maximum length of pit spacing varies depending on the pipe diameter, type of filler, filling method, etc., but when filling normal buried pipe with grouting agent as described above, it can be 200 to 800 m. . This example is
The one-span residual tube A thus formed is first broken into small pieces by a breaking device, and then filled. For this reason, as shown in FIG. 2, the breaking device 1 is positioned near the open end _a1 in the remaining tube A. A hydraulic power source 2 for operating the destruction device 1 and a winch 3 for towing it are placed at appropriate positions on the ground and within the pit C. Destruction device 1
has a hydraulic hose 20 and a traction wire 3 at the rear end.
0 is attached, and the wire is passed from the open end _a2 to the vicinity of the open end _a1 using a wire passed through the tube in advance.

Next, a filling device is placed on the open end _a1 side. The filling device includes a supply device 4 that kneads the filler with a filler mixer 40 and supplies the filler through a supply pipe 42 with a pump 41, and a drum device 5 that wraps around a flexible tube 50 and feeds it out as necessary. and a column 6 for pressurizing the filler. The pressure feeding tower 6 is
It is formed into a cylindrical shape, and the attachment part 60 on one end side is attached to the remaining tube A.
The _other end side stands up substantially perpendicularly from the mounting part 60. The supply pipe 42 and the flexible tube 50 reach the upper end opening 61 of the pressure-feeding tower 6 . The vertical height of the pressure-feeding tower 6 is determined so that when the area from the mounting portion 60 to the vicinity of the upper end opening 61 is filled with the filling material, the supply pressure described below is generated by the head difference. The inner peripheral part of the device part 60 is provided with a fixing part 62 for expanding the flexible tube 50 to a diameter approximately corresponding to the diameter of the remaining tube A and tightly fixing it to the inner peripheral part, The flexible tube 50 is connected to the pumping tower 6 from the upper end opening 61.
The inside is extended downward and fixed to the fixing part 62.
However, the flexible tube 50 may be directly fixed to the tube A.

From this state, filler is supplied to the pressure-feeding column 6 from the supply pipe 42 until it is filled up to the vicinity of the upper end opening 61. Next, the destruction device 1 is activated to destroy the pipe wall and pull it with the winch 3 alternately or in parallel, while gradually advancing the pipe toward the open end _a2 . Since the flexible tube 50 is in contact with the breaking device 1 due to the pressing force based on the head difference of the filling material, as the breaking device 1 gradually advances, it moves toward the open end _a2 side as shown in FIG. It extends while being turned inside out. This movement of the tube 50 is performed in such a way that the tube 50 supplied from the drum 5 is opened until it comes into contact with the inner peripheral surface of the tube A due to the pressure of the filler, and the inside of the tube A is sequentially filled with the filler. Since the tube is interposed between the filler and the inner surface of the tube A, even if the tube A is destroyed, it will not leak out from its crevices, cracks, etc. Tube 5 is installed in the pressure-feeding tower 6.
The filling material is supplied from the upper end opening 61 as the robot moves forward.

When the destruction device 1 reaches the opening end _a2 , the device 1
is removed from the tube A, and the open end _a2 is closed with a cap or the like to stop the tube 50. Open end a ₁
On the side, the excess packing material in the pressure-feeding column 6 was discharged by opening the outlet 63 at the lower end of the column 6, and the column 6 was removed leaving the attachment part 60, and the excess portion of the tube 50 was cut off. After that, the opening of the mounting section 60 is closed. After the filler is cured and hardened, the mounting portion 60, cap, etc. are removed to complete the filling. Note that in order to accelerate curing, a curing agent may be injected from both open ends of the tube A.

The above explanation takes as an example the case where the supply pressure of the packing material is obtained by the head difference of the packing material in the column for pressure-feeding. It can also be obtained by doing. In this case, the supply pipe from the pump device is connected to the mounting section 60 in the above example, and the flexible tube is fed into the mounting section 60 through an appropriate seal.

When only filling is performed without destroying the remaining pipe, in the above example, the filling device is placed on the one open end side and filling is performed without using the destroying device 1 and the accompanying hydraulic power source 2. It is done. In this case, a stopper may be placed in front of the flexible tube in order to make the supply pressure of the filler more uniform on the inner peripheral surface of the remaining tube. The stopper may be, for example, a frictional member such as rubber that fits tightly onto the inner circumferential surface of the remaining tube, so that the tube gradually moves against the frictional resistance. Alternatively, the frictional member may be pulled by a winch from the other end opening side.

Below, an example of a destruction device that can be used when the construction method of the present invention involves destruction of a remaining pipe will be described. The destruction device shown in FIG. 4 is equipped with a construction machine 12 that is moved in the direction of the pipe length by performing an extra-pipe operation, for example, a pulling operation of a rope 20, in a buried remaining pipe a, and the construction machine 12 is moved in the direction of the pipe length. For example, four rollers 13 are provided at intervals of 90° as shown in FIG. 5 to give the construction machine 12 mobility within the pipe, and each roller 13 is equipped with a leaf spring that functions as a cushion. It is supported by 14. Construction machine 2
A cylindrical rubber stopper 18a is attached to the end opposite to the roller 13 for sliding the remaining tube while applying frictional resistance.

A rotary shaft 15 is installed in the construction machine 12 so as to lie between the front part and the rear part so as to be located on the center axis of the pipe a when installed inside the pipe. A punch 16 is provided which is movable in the radial and circumferential directions.

A first driver, such as a hydraulic cylinder plunger device 17, for appropriately moving the punch 16 in the tube radial direction is provided on the rotary shaft 15, and the punch 16 is attached to the tip of the plunger 17a.

Further, in order to appropriately move the punch 16 in the circumferential direction of the tube, a second driver such as a hydraulic motor 18 is connected to the construction machine 1.
The rotary shaft 18a of the motor 18 is coupled to one shaft end of the rotary shaft 15 without rotation. By operating the motor 18 to rotate the rotary shaft 15 by a predetermined angle, the punch 16 can be moved in the radial direction of the tube as the shaft 15 rotates.

A reaction force receiving plate 19 for receiving the reaction force when the punch 16 is operated is attached to the base end of the construction machine 12, for example, the hydraulic cylinder 17b. In this case, the hydraulic cylinder 17b freely passes through the rotary shaft 15 in the radial direction of the tube, is movable in the radial direction of the tube, and has a reaction force receiving plate 19 attached to the base end as shown in FIG.
is urged by the restoration panel 110 so that it always returns to the position where it abuts against the rotary shaft 15.
The shape of the reaction force receiving plate 19 is not particularly limited as long as it has a shape that can receive the reaction force when the punch 16 is operated. For example, it may have an arc shape as shown in FIGS. 7 to 12. However, it can be brought into contact with the inner surface of the tube a over an angular range of, for example, about 90 degrees. When the reaction force receiving plate 19 has an arcuate shape, when receiving the reaction force, the entire surface of the reaction force receiving plate 19 may come into close contact with the inner surface of the tube a, resulting in a kind of fitted state. In order to release such a fitting, the proximal end _17a1 of the plunger 17a is made to protrude outward from the receiving plate 19 at the same time as the punch 16 is moved to the non-operating position, and the receiving plate 19 is moved from the inner surface of the tube a. It can be configured in such a way that it can be pushed out.

In addition, in the figure, 111 is a cover provided at the tip of the hydraulic cylinder 17a, 20a and 20b are hoses for supplying and discharging hydraulic oil to the hydraulic cylinder 17a, and these hoses 20a and 20b are connected to the manifold 118 and from the manifold 118. Branch pipes 114a, 114
b, are connected to the front chamber 17b ₁ and rear chamber 17b ₂ of the hydraulic cylinder 17b via supply and discharge passages 116a and 116b formed in the swivel 115 and the rotary shaft 15, respectively. Note that a hose for supplying and discharging hydraulic oil to the hydraulic motor 18 is omitted in the figure.

When destroying a pipe using this destruction device, the construction machine 12 is installed on the buried remaining pipe a as shown in Fig. 6, and for example, the remaining pipe a is first destroyed in the pipe circumferential direction. Ru.

The state of tube failure in the circumferential direction of the tube is shown in FIGS. 7 to 12 in the order of steps.

FIG. 7 shows the situation before the pipe breaks. Under this situation, the punch 16 and the reaction force receiving plate 19 are both maintained at a position away from the inner surface of the pipe a, so the construction machine 12 is pulled by the rope 11. Can be operated and moved freely in the direction of the pipe length.

In this state shown in FIG. 7, the hydraulic cylinder 17b
When hydraulic oil is supplied into the rear chamber _17b2 , the plunger 17a and the punch 16 at its tip advance in the radial direction of the pipe, and the punch 1 is moved as shown in FIG.
The tip of 6 abuts against the inner surface of the tube, and receives the reaction force of this abutment, which causes the hydraulic cylinder 17b and, in turn, the reaction force receiving plate 1
9 moves in the opposite direction to the punch 16 against the restoring spring 110 and comes into contact with the inner surface of the tube as shown in FIG.

When the oil pressure in the rear chamber _17b2 is further increased in the state shown in FIG.
As shown in FIG. 10, the punch 16 is actuated and a part of the tube a is locally destroyed. If a local break occurs in the pipe a, the pressure within the system will drop rapidly, so the local break can be confirmed by, for example, monitoring a hydraulic pressure gauge (not shown) provided within the system. tube a
As soon as local destruction of the
When the hydraulic pressure in b ₂ is released and hydraulic oil is supplied into the front chamber 17b ₁ , the plunger 17a and the punch 16 at its tip move in the radial direction of the tube and return to the original non-operating position, and at the same time the hydraulic cylinder 17b As a result, the reaction force receiving plate 19 at the base end is automatically restored to its original position by the restoring spring 110, returning to the state shown in FIG.

Next, the hydraulic motor 15 is operated to rotate the punch 16 by a predetermined angle in the circumferential direction of the tube, for example, 60 degrees as shown in FIG. 11, and then the operations in FIGS. As shown in Fig. 12, two locally broken parts _r1 are connected in the inner circumferential direction of the pipe, and by repeating this operation, the 13th
As shown in the figure, an annular fracture R consisting of six local fractures _r1 connected in the circumferential direction of the pipe is formed in the pipe a. In the formation of the annular fracture portion R, for example, when forming the sixth and final local fracture portion _r1 , the reaction force receiving plate 19 comes into contact with the inner surface of the pipe a which has already been destroyed. Since the fractured portion _r1 is backed up by the ground from the outside, there is no particular problem as long as the area of contact of the reaction force receiving plate 19 with the inner surface of the tube is made sufficiently large. In order to more reliably support the reaction force at the time of punch operation, the dimensions of the reaction force receiving plate 19 in the pipe length direction are such that one end thereof is always in contact with the unbroken part of the pipe a, as shown in FIG. 6, for example. It is preferable to set the width of the locally broken part _r1 to be larger than the width of the locally broken part r1 in the pipe length direction.

After forming the ring-shaped broken part R in this way, the construction machine 12 is moved one pitch in the pipe length direction, that is, a distance approximately equivalent to the width of the ring-shaped broken part R, and at this position, the punch 16 is again moved to the radius. By moving in the direction and circumferential direction to form a ring-shaped broken part R, repeating such operations and connecting the ring-shaped broken parts R in the direction of the pipe length, pipe a is broken over the entire length. can.

The shape of the tip of the punch 16 is usually a circle or a regular polygon such as a regular hexagon, and its diameter (in the case of a regular polygon, the diameter of its circumscribed circle) is suitably about 80 to 60 mm. According to the inventor's experiments, when the punch 16 with the above dimensions is used to destroy a buried remaining pipe a with an outer diameter of 800 mmφ, the maximum diameter of the locally destroyed part _r1 is about 100 to 200 mm, for example, By connecting about six target fracture parts r ₁ in the circumferential direction of the pipe, a ring-shaped fracture part R could be formed, and the purpose of pipe destruction could be achieved with high working efficiency. In addition, since the size of the local fracture r ₁ is about 100 to 200 mm (maximum diameter),
During ground excavation, the broken pieces of the pipe that destroyed the filler material could be easily removed from outside the pipe together with the filler material. Furthermore, the destructive force required to form a localized fracture _r1 is 5 to 20 tons.
For example, it could be easily carried out using a hydraulic pump of about 5 to 10 horsepower.

[Brief explanation of the drawing]

The figure shows an example of the construction method of the present invention.
Figure 1 is a vertical cross-sectional view showing the buried pipe in the preparation stage, Figure 2 is a vertical cross-sectional view showing the initial stage of implementing the method, Figure 8 is a vertical cross-sectional view showing the intermediate stage of implementing the method, Figures 18 to 18 show a destruction device that can be used in the construction method. Figure 4 is a side view showing a partial cross section of the equipment, Figure 5 is a front view of the equipment, and Figure 6 is a destruction device that can be used in the construction method. Side view shown with the tube, Figures 7 to 1
FIG. 2 is a longitudinal sectional front view showing a step-by-step process of breaking the remaining tube in the circumferential direction, and FIG. 18 is a longitudinal sectional front view showing a state in which a ring-shaped broken portion is formed. 1...Destruction device, 4...Filling material supply device, 5...
...Drum device, 6...Filling material pressure feeding tower, 50...
Flexible tube, 62...Tube fixing part, A...
...Buried residual pipe.

Claims (1)

[Claims] 1. When filling a buried remaining pipe with a filler for preventing the inflow of earth and sand, one end edge of a flexible tube extending from the outside of the pipe is widened and tightly supported around one open end of the pipe, and the flexible tube is filled from the open end side. A buried residual tube characterized in that a filler is supplied, and the tube is sequentially turned over and inserted into the tube by the supply pressure, and the tube is interposed between the tube and the inner surface of the tube to form a filling part. Filling method.