JP3394672B2 - Updating existing pipeline - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replacing a pipeline such as an old sewer pipe with a new pipeline by using a shield excavator.

[0002]

2. Description of the Related Art In order to replace sewer pipes that have deteriorated due to long-term use, sewer pipes are buried in shallow soil cover in soft ground below the groundwater level, such as clay layers and sandy soil. In many cases, in order to prevent the occurrence of ground subsidence at the time of renewal, it is necessary to excavate the ground around the sewer pipe using a mud type or mud pressure type fully closed shield excavator.

As a method of updating an existing pipeline such as a sewer pipe using such a shield excavator, a front donut is provided on the outer circumference of the existing pipeline as described in, for example, Japanese Patent Laid-Open No. 5-287984. A shielded excavator in a shape is installed, and while excavating the ground around the existing pipeline with this shield excavator, a new pipeline with a diameter larger than the existing pipeline is assembled behind the shield excavator, and then the existing pipeline is installed. The method of removing the road is adopted.

[0004]

However, according to the above-mentioned method for updating the existing pipeline, the outer peripheral surface of the existing pipeline is guided in a state where the existing pipeline is penetrated through the center of the shield excavator having a front donut shape. However, the smoothness of the outer peripheral surface of the existing pipe body is required to smoothly propel the shield excavator, and in addition, the joint part like the fume pipe is large. In the case of a pipeline having a diameter, the large-diameter joint portion hinders the forward movement of the shield excavator, making it difficult to renew the pipeline.

Further, as described above, the shield excavator excavates along the existing pipeline in a state where the existing pipeline is penetrated in the center thereof, so that the new pipeline is concentric with the existing pipeline. Inevitably it will be a large-diameter pipeline, and if the existing pipeline is buried in the ground with shallow soil cover, it may adversely affect the ground surface. When other existing pipelines such as power transmission pipes exist, it is impossible to avoid such existing pipelines for excavation, and there is a problem that the renewable pipelines are limited. Also,
Since the existing pipeline runs through the shield excavator, the space inside the machine is narrowed, and means for discharging excavated soil such as a screw conveyor, an erector for assembling a new pipeline, a hydraulic unit for operating various equipment, etc. However, there is a problem that it is difficult to install.

The present invention has been made in view of the above problems, and an object thereof is to use a shield excavator to construct a new pipeline along the existing pipeline regardless of the size of the existing pipeline. Even if other existing pipelines such as gas pipes and power transmission pipes exist near the existing pipelines, it is possible to efficiently replace the existing pipelines without adversely affecting the ground. It is to provide a method for updating the road.

[0007]

In order to achieve the above object, the invention according to claim 1 is a method of renewing an existing pipeline which is to replace an existing pipeline buried in the ground with a new pipeline. Then, after filling the solid material inside the existing pipeline, at least one part of the existing pipeline is taken into the shield excavator while crushing at least a part of the existing pipeline along with the ground excavation by the shield excavator from one end side of the existing pipeline. It is characterized in that it is discharged to the rear and further a new pipeline is formed behind the shield excavator as the shield excavator advances. In this method of renewing the existing pipeline, the fixing material filled in the existing pipeline is, as described in claim 2, poorly mixed mortar or sand, or excavated soil and cement excavated by the shield excavator. And a mixture with.

The invention according to claim 3 is another method for renewing an existing pipeline, wherein the inner wall surface of the existing pipeline is formed inside the existing pipeline to prevent leakage to the ground. After being filled with the liquefied liquid material, the existing pipeline is crushed together with the ground excavation around the existing pipeline by the shield excavator from one end side of the existing pipeline, and taken into the shield excavator and discharged backward, Further, a new pipeline is formed behind the shield excavator as the shield excavator advances. In this method, as the film forming liquid material, bentonite muddy water or a material obtained by adding water to excavated soil excavated by the shield excavator can be used.

[0009]

In the inventions according to claims 1 and 2, the hollow existing pipeline becomes a solid tube since the existing pipeline is filled with a solid material such as poorly mixed mortar. If the existing pipeline is hollow, even if you try to destroy the pipe wall with the cutter plate of the shield excavator, it is difficult for the existing pipe to shake and it is difficult to efficiently crush it, and even if it breaks it will become a large fragment. I can't take it into the plane,
As mentioned above, when the solid material is filled and solidified in the hollow inside of the existing pipeline, the existing pipeline is crushed into small pieces together with the solid material according to the excavation of the shield excavator without shaking, and taken into the machine with the excavated earth and sand. Discharge processing becomes possible.

The excavation of the shield excavator may be performed after the solid material is filled and solidified in the existing pipeline over the entire length, or the existing pipe in front of the shield excavator is advanced while the shield excavator is propelled. Solid material may be filled and solidified in the channel, but when excavating the shield excavator while filling and solidifying the solid material in the existing pipeline, earth and sand excavated by the shield excavator and existing The debris from the line can be reused as part of the solid material. In this case, excavated earth and sand and crushed pieces are discharged to the ground and mixed with cement milk on the ground side to prepare an uncured poorly mixed mortar, and this poorly mixed mortar is installed on the arrival side of the shield excavator. The solid material is poured from the other end of the pipeline into the existing pipeline to fill it.

Further, according to the above invention, the shield excavator excavates the ground while crushing the existing pipeline without using the existing pipeline as a guide, so that the existing pipeline is not affected. Not only is it possible to effectively use the space inside the machine to discharge excavated earth and sand, assemble new pipelines, and install various equipment, it also relates to the laying direction of existing pipelines and the size of the pipeline. It is possible to dig in a desired direction without. Therefore, even if the existing pipeline is buried in a shallow ground, it is possible to lay a new pipeline without adversely affecting the ground, and other existing pipelines such as gas pipelines can be installed near the existing pipeline. Even if it is buried, it is possible to efficiently lay a new pipeline on the planned line while excavating while avoiding this existing pipeline.

In the inventions described in claims 1 and 2, the mortar of poor composition is filled and solidified in the existing pipeline, but the inventions according to claims 3 and 4 are the existing pipelines. Filled with bentonite muddy water or a liquid material obtained by adding water to the earth and sand excavated by the shield excavator, and in this state, the shield excavator crushes the ground along with the excavation of the ground and the shield excavator A new pipeline will be formed in the rear.

According to the third and fourth aspects of the present invention, the liquid material filled in the existing pipeline is the same as that of the solid material according to the first or second aspect of the present invention in the shield excavator. It is possible to eliminate swinging of the existing pipeline at the time of crushing, and to smoothly advance the shield excavator in a desired direction while crushing the existing pipeline into small pieces. In this case, the bentonite muddy water has a film-forming property, so that when the existing pipeline is filled, it forms a film on the inner peripheral wall surface of the existing pipeline, and there is no risk of leaking into the ground. Similarly, since the colloidal component of excavated earth and sand has a film forming action, even in the case of a liquid material obtained by adding water to this earth and sand, a film is formed on the inner peripheral wall surface of the existing pipeline and the liquid material is added to the existing pipeline. It is possible to prevent the joint from leaking into the ground, and it is possible to smoothly crush the existing pipeline by the shield excavator.

According to the invention described in claim 1,
Since the solid material is filled in the existing pipeline, it is possible to lay a new pipeline while crushing a part of the existing pipeline. In the invention according to claim 3, one of the existing pipelines is When crushing the part, the liquid material in the pipeline will flow out into the ground,
The existing pipeline is crushed while the open end of the existing pipeline is pressed from the inside of the machine by a full-closed shield excavator having a diameter larger than that of the existing pipeline. Other functions and effects are the same as those of the invention described in claim 1.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A concrete embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, first, the sewer pipe 1 (to be renewed on the ground where the existing sewer pipe is buried). The sewer pipe 1) of the renewal area is drilled from the ground at the starting side vertical hole 2 and the reaching side vertical hole 3 with a length interval, and the renewal area is exposed at the bottoms 2a, 3a of these vertical holes 2, 3. Both ends of the sewer pipe 1 are destroyed and removed, and the sewer pipes 1A and 1B on the upstream side and the downstream side of the sewer pipe 1 are connected to the sewer pipe 1 to be renewed through the bottom portions 2a and 3a. To do.

Further, both ends of the bypass pipe 4 arranged on the ground are excavated to the bottom 3a of the reaching vertical hole 3 which is excavated to the upstream sewer pipe 1A side and the downstream sewer pipe 1B side. The bottom end of the bypass pipe 4 facing the bottom portion 3a of the reaching side vertical hole 3 and the bottom end of the bypass pipe 4 facing the bottom portion 3a of the reaching side vertical hole 3, respectively.
It is connected to and communicates with the water pump 5 installed in 3a. Then, by the operation of this water supply pump 5, the upstream sewer pipe 1A
Sewage flowing from the bottom side 3a of the reaching side vertical hole 3 to the bottom 2a of the starting side vertical hole 2 through the bypass pipe 4 and flowing out from the bottom 2a to the downstream side sewer pipe 1B, and the sewer pipe 1 in the renewal area. Is kept empty with no sewage.

In FIG. 1, the upstream sewer pipe 1A
Shows that the downstream sewer pipe 1B is sequentially buried via the sewer pipe 1 in the renewal area so that the depth from the surface becomes deeper in stages, but from the upstream sewer pipe 1A to the downstream side. It may be in a state in which the pipe is inclined downward toward the sewer pipe 1B. In addition, if the sewer pipe from the upstream sewer pipe 1A to the downstream sewer pipe 1B is buried horizontally, or if it is buried in a slightly upward inclined state, open the open end of the downstream sewer pipe 1B. It is hermetically sealed by a sealing plate (not shown), and the sealing pipe is penetrated to bypass the bypass pipe 4
If the lower end of the sewer is communicated with the downstream sewer pipe 1B, the sewer flowing from the upstream sewer pipe 1A into the bottom part 3a of the reaching side vertical hole 3 does not flow to the sewer pipe 1 of the renewal area, and the downstream sewer pipe Can be drained to tube 1B. Therefore, the vertical hole 2 side on the starting side may be the upstream sewer pipe 1A, and the vertical hole 3 side on the arrival side may be the downstream sewer pipe 1B.

Thus, while keeping the inside of the sewer pipe 1 of the renewal area empty without any sewage, as shown in FIG. 2, the poorly mixed mortar 6 which is a solid material is contained in the sewer pipe 1.
Inject and fill. In this work, first, after closing the opening end of the sewer pipe 1 opening to the vertical hole 2 on the starting side with the gable plate 7a, the poorly mixed mortar 6 in the tank 8 installed on the ground is reached from the tank 8 on the arrival side. The water is pumped and injected into the sewer pipe 1 through a feed pipe 9 that is piped in the vertical hole 3.

When the poorly mixed mortar 6 fills the reaching side vertical hole 3 side of the sewer pipe 1, the open end facing the vertical hole 3 is closed by the gable plate 7b (shown in FIG. 3), and the sewer pipe 1 is closed. The inside is filled with poorly mixed mortar 6 over the entire length. The poor mortar 6 may be supplied to the inside of the sewer pipe 1 from the start side vertical hole 2 side.

Next, the shield excavator is installed in the vertical hole 2 on the starting side.
10 is installed, and after the poor mixed mortar 6 filled in the sewer pipe 1 in the renewal area is solidified, the shield excavator 10 is started. This shield excavator 10 is a known full-closed type excavator, and as shown in FIG. 4, a rotary cutter plate 12 is provided at the front end of the opening of a cylindrical skin plate 11, and the cutter plate 12 is also provided. Back side skin plate 11
A partition wall 13 is stretched at the front end of the to form an excavated earth and sand intake chamber 14 between the rear surface of the cutter plate 12 and this partition wall 13,
A screw conveyor 15 which is a means for discharging earth and sand is installed inside the machine behind the partition wall 13 and the front end opening of the screw conveyor 15 is passed through the lower end portion of the partition wall 13 to face the intake chamber 14 and the screw conveyor. The earth and sand discharge pipe 24 is connected and communicated with the rear end portion of the upper tilt of 15.
A plurality of propulsion jacks 16 are mounted on the inner peripheral surface of the rear end portion of 11. Although not shown, an erector and other devices are arranged inside the rear end of the skin plate 11.

The shield plate 10 of the shield excavator 10 is applied to the opening end face of the sewer pipe 1 facing the starting vertical hole 2 and the ground around the open end face of the shield excavator 10 while rotating the cutter plate 12. When the sewage pipe 1 is promoted, the sewer pipe 1 is crushed together with the poorly mixed mortar 6 which is filled and solidified inside the cutter plate 12, and the ground in the peripheral portion is excavated, and the sewer pipe 1 and the poorly mixed mortar 6 are crushed The piece is taken into the intake chamber 14 through the opening provided in the cutter plate 12 together with the excavated earth and sand, and is discharged from the screw conveyor 15 to the discharge pipe.
It is discharged to the ground side through 24.

When the shield excavator 10 advances for a certain length,
The segment 17 for one ring assembled in the rear end of the skin plate 11 is lined on the tunnel wall excavated by the shield excavator 10, and the segment 17 receives the propulsion reaction force of the propulsion jack 16 to cause the propulsion. By extending the jack 16, the shield excavator 10 is advanced, the sewer pipe 1 and the poorly mixed mortar 6 are crushed, and the surrounding ground is excavated.

Thus, the shield excavator 10 is propelled while the sewer pipe 1 filled with the poorly mixed mortar 6 is crushed and the surrounding ground is excavated, while the shield excavator 10 is
The shield excavator 10 is advanced to the reaching side vertical hole 3 while forming a new pipe line by assembling the segment 17 in the rear of the. In the meantime, when another existing pipeline such as a gas pipeline exists near the sewer pipe 1 in the renewal area, the excavation direction of the shield excavator 10 is controlled so as to avoid the existing pipeline.

Even while the shield excavator 10 is being dug and the new pipeline 18 is being formed, the sewage flowing from the upstream sewer pipe 1A is allowed to flow to the downstream sewer pipe 1B through the bypass pipe 4 as described above, and the sewage is discharged. The new pipeline 18 is formed without hindering the flow of. When the shield excavator 10 reaches the reaching vertical hole 3, the bypass pipe 4 is removed together with the water supply pump 5, and then both end openings of the new pipeline 18 are connected to the upstream sewer pipe 1A and the downstream sewer pipe 1B, respectively. The vertical holes 2 and 3 are then backfilled.

In the method of renewing the sewer pipe 1 which is an existing pipe, the sewer pipe 1 in the renewal area was filled with the poorly mixed mortar 6 and solidified, and then the shield excavator 10 was excavated. As shown in FIG. 4, while the shield excavator 10 is being advanced, the poor mixing mortar 6 is placed in the sewer pipe 1 in front of it.
May be filled and solidified.

In this case, after the crushed pieces of the sewer pipe 1 and the poorly mixed mortar 6 which are crushed by the shield excavator 10 and the excavated earth and sand are taken into the intake chamber 14 in the machine, the screw conveyor 15 is passed to the discharge pipe 24 side. And crushing the crushed pieces and large lumps mixed in the excavated earth and sand into small pieces by a crusher 25 disposed in the discharge pipe, and conveying them into the tank 8 installed on the ground through the discharge pipe 24. To do. Further, the cement milk 19 is supplied into the tank 8 through the supply pipe 20,
After mixing with the above-mentioned crushed pieces and excavated earth and sand in the tank 8 to form a poorly mixed mortar 6, it is pressure-fed and injected into the sewer pipe 1 from the tank 8 through the feed pipe 9 piped in the reaching-side vertical hole 3. Is.

In the sewer pipe 1, the unsolidified poor mix mortar 6 prepared by reusing the earth and sand excavated by the shield excavator 10 and the crushed pieces of the sewer pipe 1 and the poor mix mortar 6 and mixing with cement milk In the case of injecting and filling the sewage pipe 1, a partition plate 22 having air holes 21 is stretched at regular intervals of the sewer pipe 1, and the partition plate 22 and the fixed length part are filled and solidified poorly mixed mortar. The poorly mixed mortar 6 is poured between the solidified material 6 and the solidified material, and after the poorly mixed mortar 6 is solidified, the partition plate 22 is moved backward by a certain size in the length direction of the sewer pipe 1 and again in the same manner as above. Poor poor mortar 6
It is to solidify, and the poor mortar 6 that has already solidified in parallel with the injection and solidification work of the poor mortar 6
One part of the sewer pipe that is filled with the water is crushed by the shield excavator 10 along with the excavation of the ground around it.

According to the excavation of the shield excavator 10, a new pipeline 18 is formed on the rear side thereof by assembling the segments 17, and even during excavation, the sewage flowing from the upstream sewer pipe 1A is passed through the bypass pipe 4 to the downstream side. Outflow to the sewer pipe 1B is the same as in the above embodiment. The water supply pump 5 may be arranged in the middle of the bypass pipe 4, as shown in FIG.

In any of the above-mentioned embodiments, the sewer pipe 1 of the renewal area is filled with the solid material of the poorly mixed mortar 6 and solidified to leave the sewer pipe 1 as a substantially solid structure. When renewing the sewer pipe 1 having such a solid structure, if a shield excavator 10 having a diameter larger than that of the sewer pipe 1 is used, the sewer pipe 1 which is an existing pipeline is wrapped inside as shown in FIG. In this way, the entire sewer pipe can be destroyed and removed, and the large-diameter new pipeline 18 can be replaced while excavating the ground around the sewer pipe. Further, as shown in FIG. 6, the existing pipeline (sewer pipe 1) Eccentric to the new pipeline
Alternatively, as shown in FIG. 7, it is possible to form a new pipeline 18 by excavating the ground while crushing and removing a part of the existing pipeline (sewer pipe 1).

Further, when the new pipeline 18 is formed in the excavation tunnel by the shield excavator 10 while crushing a part of the existing pipeline along with the excavation of the ground in this way, the shield excavator 10 is an existing pipeline. The diameter may be the same as or smaller than that of a certain sewer pipe 1, and therefore a new pipeline 18 having the same diameter as the sewer pipe 1 or a smaller diameter than the sewer pipe 1 can be laid. In addition, the sewer pipe 1 which is an existing pipeline is filled with
As the solid material to be solidified, sand may be filled in addition to the poorly mixed mortar 6, and in short, the sewer pipe 1 that can be excavated by the shield excavator 10 and has a substantially solid structure in the renewal area may be used.

Next, in the above embodiment, the sewer pipe 1 of the renewal area was filled with the solid material such as the poorly mixed mortar 6, but as shown in FIG. 8, it was excavated by the bentonite muddy water or the shield excavator. The excavated soil is filled with liquid material 23, and the open end of the sewer pipe 1 on the side of the reaching vertical hole 3 is sealed, and the existing pipe is installed by the shield excavator 10 from the side of the starting vertical hole 2. The ground around the sewer pipe 1 is excavated while crushing the sewer pipe 1, which is a channel, and a new pipeline 18 is constructed by an assembly segment behind the shield excavator 10 according to the excavation of the shield excavator 10. Good.

When the sewer pipe 1 is filled with bentonite muddy water or excavated earth and sand added with water, these liquid materials 23 have a film forming property, so that a film is formed on the inner peripheral surface of the sewer pipe 1. Leverage liquid material does not leak into the ground from pipe joints and the like, and when the sewer pipe 1 is crushed by the shield excavator 10, the sewer pipe 1 is shaken to be broken into fine crushed pieces. can do.

In this method of renewing the existing pipeline, the shield excavator 10 is a fully closed type excavator, so the front surface of the cutter plate 12 is pushed over the entire circumference of the end surface of the sewer pipe 1 to be crushed. When brought into contact, the inside of the sewer pipe 1 will pass through the earth and sand intake opening of the cutter plate 12 and the closed earth and sand intake chamber 14 inside the machine.
As a result, the sewer pipe 1 can be crushed without leaking the liquid material 23 in the sewer pipe 1.
When a part of the sewer pipe 1 is crushed so that the front surface of the cutter plate 12 overlaps with a part of the sewer pipe 1, the liquid material inside the ground through the gap between the crushed part and the outer periphery of the cutter plate 12.
Since 23 will leak out, it is necessary to use a shield excavator 10 having a diameter larger than that of the sewer pipe 1 to be renewed. Other functions and effects are the same as those of the above renewal method of filling the sewer pipe 1 with the solid material.

In any of the above-mentioned methods for updating the existing pipeline, the case where the existing pipeline is the sewer pipe has been described, but it can be applied to the case where the gas pipe or the wiring pipe is updated. When renewing such pipes, the treatment using the above-mentioned bypass pipe which secures the flow of sewage like a sewer pipe becomes unnecessary. Further, the new pipe 18 was formed by assembling the segment behind the shield excavator 10, but while excavating by the shield excavator 10, a ready-made buried pipe was propulsively embedded by the propulsion method from the vertical hole 2 on the starting side. Good. Further, existing manholes may be used as the starting side vertical hole 2 and the reaching side vertical hole 3. In this case, if the shield excavator 10 can be assembled in the manhole, the manhole can be used as it is, but if not, the manhole can be widened.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of an existing pipeline part in the renewal area,

FIG. 2 is a vertical sectional side view showing a state in which an existing pipe line is filled with a poorly mixed mortar,

FIG. 3 is a vertical sectional side view showing a state in which an existing pipeline is being renewed,

FIG. 4 is a vertical sectional side view showing another embodiment of the present invention,

FIG. 5 is a vertical cross-sectional front view of a new pipeline that has been re-laid so as to wrap the existing pipeline,

FIG. 6 is a vertical sectional front view showing a state in which a new pipeline is laid at an eccentric position of an existing pipeline,

FIG. 7 is a vertical sectional front view showing a state in which a new pipeline is laid so as to overlap a part of the existing pipeline.

FIG. 8 is a vertical sectional side view for explaining still another updating method of the present invention.

[Explanation of symbols]

1 Sewer pipe which is existing pipeline 2 Start side vertical hole 3 Arrival side vertical hole 4 Bypass pipe 6 Poor mixed mortar 10 shield excavator 18 New pipeline

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuhide Ueno 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka City Okumura Gumi Co., Ltd. (72) Kenji Suzuki 2--2-2 Matsuzaki-cho, Abeno-ku, Osaka Okumura Gumi Co., Ltd. (72) Inventor Takashi Misawa 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka City Okumura Gumi Co., Ltd. (56) Reference JP-A-3-290591 (JP, A) JP-A-63-189593 ( JP, A) JP 8-246787 (JP, A) JP 57-161299 (JP, A) JP 7-317958 (JP, A) JP 5-272300 (JP, A) JP Sho 59-17081 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 1/02 E21D 9/06 311

Claims (4)

(57) [Claims] 1. A method of renewing an existing pipeline buried in the ground into a new pipeline, which comprises filling a solid material inside the existing pipeline and then shielding the existing pipeline from one end side thereof. The excavator crushes at least a part of the existing pipeline along with the excavation of the ground and takes it into the shield excavator and discharges it rearward, and further forms a new pipeline behind the shield excavator as the shield excavator advances. A method of updating an existing pipeline that is characterized by 2. The method for updating an existing pipeline according to claim 1, wherein the solid material is a poorly mixed mortar or sand, or a mixture of excavated soil excavated by the shield excavator and cement. . 3. A method for renewing an existing pipeline buried in the ground into a new pipeline, wherein a film is formed on the inner wall surface of the existing pipeline inside the existing pipeline to prevent leakage to the ground. After filling the film-forming liquid material that does not occur, the existing pipeline is crushed with the shield excavator from one end side of the existing pipeline along with the excavation of the ground around the existing pipeline and taken into the shield excavator and backward. And a new pipeline is formed behind the shield excavator according to the progress of the shield excavator. 4. The existing pipeline according to claim 3, wherein the film-forming liquid material is formed by adding water to bentonite mud or excavated soil excavated by the shield excavator. How to update.