JPH04224382A - Diameter expansion working method for existing embedded pipe - Google Patents

Abstract

PURPOSE:To conduct the effective diameter expansion of an existing embedded pipe by conducting separately the digging and the removal of the existing embedded pipe outer periphery place. CONSTITUTION:A shield dig advancing machine 100 inserted with an existing embedded pipe 71 is used, and in a cutter chamber 16, the existing embedded pipe is removed by advancing its upper portion. The digging of a working face is conducted by the machine 100, and since this machine 100 is not used for the removal of the existing embedded pipe T1, dig advancing is reasonably conducted even if steel such as a ferroreinforcement is mixed into the pipe T1, and such as steel or its kind getting entagled with a cutter bit can be avoided, can be offered.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an existing buried pipe for replacing an existing buried pipe and constructing a new buried pipe having a larger diameter than the existing buried pipe at the location where the existing buried pipe was buried. This relates to the pipe diameter expansion method.

0002

2. Description of the Related Art Conventionally, as a method for expanding the diameter of an existing buried pipe as described above, it has been proposed to use a shield excavator that excavates the existing buried pipe along with the ground with a cutter bit at a face.

0003

[Problem to be Solved by the Invention] However, existing buried pipes are made of concrete with reinforcing bars, are lined with steel segments, or even have a primary lining with steel segments to cover the inner surface. (Existing buried pipe T shown in the example)
1, the inner surface of the steel segment S1 of the primary lining is lined with concrete C. ), it is impossible to excavate while crushing the steel together with the ground with the same cutter bit, and fragments of reinforcing bars and steel segments may become entangled with the cutter bit, making it impossible to excavate, or the uptake of excavated soil (hereinafter referred to as In this application, it has the disadvantage that it is impossible to excavate efficiently (referred to as soil removal).

The present invention was developed in view of the above-mentioned drawbacks, and it is possible to efficiently expand the diameter of an existing buried pipe by separately performing excavation of the outer peripheral portion of the existing buried pipe T1 and removal of the existing buried pipe T1. The purpose is to provide a construction method.

[0005]

[Means for Solving the Problems] In accordance with the above-mentioned object, the structure of the present invention whose gist is the scope of the above-mentioned claims is to solve the above-mentioned problems by providing an existing buried pipe T1 in the skin plate 1.
The partition wall 2 has a hollow portion 2a having a diameter through which the cutter drum device 10 can be inserted, and the support ring portion 11 of the cutter drum device 10 is rotatably supported on the partition wall 2. A ring-shaped gear in which drive motors 3, 3, 3, . . . are fixed, and pinions 3a disposed on the drive shafts of the drive motors 3, 3, 3, . 12, and the cutter drum device 10 is provided with a cutter face portion 13 on its distal end surface having a hollow portion 14 in the center through which the existing buried pipe T1 can be inserted. In the cutter chamber 16 of the device 10, a plurality of excavating soil scraping upper blades 15 are installed radially, and each of the excavating soil scraping upper blades 1
A shield excavator 100 is used in which elastic scraping plates 17 for scraping off earth and sand adhering to the outer periphery of the existing buried pipe T1 are connected to each other at the inner end of the pipe T1. The existing buried pipe T1 whose diameter is to be expanded is inserted into the hollow part 2a, and the upper part of the existing buried pipe T1 is advanced to the inside of the cutter chamber 16 and removed, and the upper part of the existing buried pipe T1 is removed. The earth removal device 18 is placed in such a way that its tip reaches into the cutter chamber 16, and after the shield excavation machine 100 has excavated the outer ground of the existing buried pipe T1 for a desired distance, When constructing a new buried pipe T2 in the shield excavator 100,
Existing buried pipe T newly entered into the shield excavator 100
1, the upper part of which is removed in an advanced manner.

[0006]

[Function] Therefore, the method for expanding the diameter of existing buried pipes of the present invention is
From the illustrated body, the shield excavator 100 is operated, and the cutter drum device 10 is driven by the drive motors 3, 3, 3...
Rotate to start digging. During this digging, the shield jack 21 (see FIG. 1) is extended to obtain propulsive force, as in the conventional method. Then, the existing buried pipe T
1 is excavated by the cutter face part 13, the excavated soil is taken into the cutter chamber 16 (hereinafter referred to as "swallowed" in the usual expression), and the excavated soil swallowed into the cutter chamber 16. As the cutter drum device 10 rotates, the excavated soil scraping upper blade 15 scrapes up above the cutter chamber 16, and the excavated soil scraped up to the upper part of the cutter chamber 16 is removed by its own weight. It falls into the existing buried pipe T1.

[0007] The excavated soil that has fallen into the existing buried pipe T1 (in this embodiment, since a belt conveyor is used as the earth removal device, the excavated soil that has fallen onto the earth removal device 18) is sequentially removed by a subsequent method. It is being dug up while being cleared of the earth.

[0008] When the desired distance of excavation is completed, the excavation is temporarily interrupted and a new buried pipe T2 is constructed in the shield excavator 100 using a conventional method. That is, the segment ring R is assembled in the space created by retracting the shield jack 21, and the lining of the newly installed buried pipe T2 is performed.

When constructing the new buried pipe T2, the state shown in FIG. 1 is returned by advancing the upper part of the existing buried pipe T1 that has newly entered the shield excavator 100 and removing it. By sequentially repeating this step, the existing buried pipe T1 can be successively expanded in diameter to become a new buried pipe T2.

[0010] The existing buried pipe T1 may be removed by using various conventionally known mechanical or manual removal devices.
6, the upper part of the newly entered area must be removed prior to the next excavation, but there is no particular restriction on the timing of removal of the entire rear end of the existing buried pipe T1. Instead, it may be removed at once during excavation or after assembling a plurality of segment rings in an amount corresponding to the excavation distance.

[0011]

Embodiments Next, embodiments of the present invention will be described below with reference to the accompanying drawings.

In the figure, T1 is an existing buried pipe, and the present invention updates this existing buried pipe T1 and installs a new buried pipe T2 having a larger diameter than the existing buried pipe T1, where the existing buried pipe T1 is buried. It is intended for construction in the same location.

In the method of the present invention, a partition wall 2 having a hollow portion 2a having a diameter through which the existing buried pipe T1 can be inserted is provided in the skin plate 1, and a cutter drum device 1 is installed in the partition wall 2.
A support ring portion 11 of the partition wall 2 is rotatably supported, and a drive motor 3 is mounted on the outer periphery of the hollow portion 2a of the partition wall 2.
, 3, 3... are fixed, and the drive motors 3, 3... are fixed.
, 3... are respectively meshed with ring-shaped gears 12 fixed to the support ring portion 11, and the cutter drum device 10 has a center portion on its tip surface. A cutter face portion 13 having a hollow portion 14 through which the existing buried pipe T1 can be inserted is provided, and further,
In the cutter chamber 16 of the cutter drum device 10, a plurality of excavated soil scraping upper blades 15 are installed radially, and the inner end of each excavated soil scraping upper blade 15 is used to remove earth and sand attached to the outer periphery of the existing buried pipe T1. A shield excavator 100 is used in which elastic scraping plates 17 are connected to each other for scraping off.

In order to insert the existing buried pipe T1 through the center of the shield excavator 100, a peripheral support method is adopted for supporting the cutter drum device 10. In the partition wall 2, the existing buried pipe T1 is inserted through the hollow portion 2a. Although the cutter face 13 is of the open spoke type in the illustrated example, this is because the ground around the outer periphery of the existing buried pipe T1 is often stable, and depending on the condition of the ground, the spoke open type is used. Of course, a conventionally known adjustable cutter face section may also be used.

[0015] The partition wall 2 has an inner peripheral end surface (first
The left side of the figure) has a ring groove 2b that rotatably supports a support ring part 11 of a cutter drum device 10, which will be described later, and further has a ring groove 2b on the inner peripheral end surface that closes the gap with the outer peripheral surface of the existing buried pipe T1. A packing ring 18 is provided.

The example shown in FIG.
' and a sliding ring 2'' that is slidably fitted into the outer fixing ring 2', and this sliding ring 2'' is made up of sliding hydraulic cylinders 22, 22, 22...・
The ring groove 2b is provided in the sliding ring 2''. Although not shown in the figure, a protruding part parallel to the central axis is provided on the outer periphery, and a key-shaped groove into which this protruding part fits is provided on the outer circumferential fixing ring 2'. Although it can slide in the axial direction, rotation is restricted.

Further, the cutter drum device 10 has a hollow portion 14 in the center thereof through which the existing buried pipe T1 can be inserted, and a plurality of excavating soil upper blades 15 are installed in the cutter chamber 16. The structure is similar to that conventionally known except that it is attached radially and an elastic scraping plate 17 is connected to the inner end of each excavated soil scraping upper wing 15 to scrape off soil adhering to the outer periphery of the existing buried pipe T1. Although it has the same structure, it has a support ring part 11 at the rear end, and this support ring part 11 is fitted into the ring groove 2b via a bearing 2c etc. and is supported. Further, a ring-shaped gear 12 (internal gear) is fixed to the rear end surface of this support ring portion 11, and this ring-shaped gear 12 is loosely inserted into the ring groove 2b.

Furthermore, the drive motors 3, 3, 3...
is fixed to the rear end surface of the partition wall 2, its drive shaft enters the ring groove 2b, and each pinion 3a arranged on this drive shaft
are meshed with the ring-shaped gear 12, respectively, and the drive motor 3,
3, 3, . . . rotate the cutter drum device 10.

Therefore, in the shield excavator 100, the cutter drum device 10 is rotated by the drive motors 3, 3, 3, . . . , and the cutters 40, 40, 40, .・The ability to excavate the face is the same as before, but in the case of Fig. 2, when excavation is temporarily interrupted and excavated again, large earth pressure is applied to the cutter drum device 10 due to expansive ground, etc. If the cutter drum device 10 is rotated after the sliding ring 2'' to the cutter drum device 10 are moved backwards using the hydraulic cylinders 22, 22, 22, etc., startup becomes easy. In FIG. 1, 19a is a conventionally known overcutter, 19b is a tail seal, and 19c is a segment erector.

In the construction method of the present invention, the shield excavator 100 is installed in such a state that the existing buried pipe T1 whose diameter is to be enlarged is inserted through the hollow part 14 and the hollow part 2a, and the existing buried pipe T1 is The upper part thereof is advanced to the inside of the cutter chamber 16 and removed, and the earth removing device 18 is placed on the existing buried pipe T1 so that its tip enters into the cutter chamber 16. That is, the shield excavator 100 is arranged in the state shown in FIG. (Of course, there is no problem in changing to a conventionally known earth removal device.) A worker rides on the sled 32 and enters the cutter chamber 16 on the tip side from the bulkhead 2, and advances and removes the upper part of the existing buried pipe T1. The state where the work is being carried out.

[0021] After the shield excavation machine 100 excavates the outer ground of the existing buried pipe T1 for a desired distance, when constructing a new buried pipe T2 in the shield excavation machine 100 by a conventional method, a new shield excavation is performed. The existing buried pipe T1 that has entered the aircraft 100 is removed by advancing its upper part. That is, from the illustrated state, the operator retreats and removes the sled 32, and the cutter drum device 10 is moved by the drive motors 3, 3, 3...
Rotate and dig. Then, as mentioned above, since excavation or lining of the new segment buried pipe T2 is carried out in the usual manner, the existing buried pipe T1 apparently enters the shield excavator 100 as the excavation progresses, so that the state shown in FIG. The existing buried pipe T1 can be removed by advancing its upper part.

[0022]

[Effect of the invention] Since the construction method of the present invention is as described above,
The excavation of the face is carried out by the shield excavator 100, and the shield excavator 100 is not used to remove the existing buried pipe T1, so even if steel such as reinforcing bars is mixed in the existing buried pipe T1, excavation can be carried out rationally. It is possible to provide a method for expanding the diameter of an existing buried pipe that can avoid steel objects getting entangled with the cutter bit.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a buried pipe being excavated by the construction method of the present invention.

FIG. 2 is a partial sectional view of a shield tunneling machine used in the present invention in another embodiment.

FIG. 3 is a sectional view taken along line A-A.

[Explanation of symbols]

1. Skin plate 2 Partition wall 2a Hollow part 3 Drive motor 3a pinion 10 Cutter drum device 11 Support ring part 12 Ring-shaped gear 15 Raking wing 13 Cutter face part 14 Empty area 16 Cutter chamber 17 Elastic scraping plate 18 Earth removal equipment 100 Shield tunneling machine T1 Existing buried pipe T2 Newly installed underground pipe

Claims (1)

[Claims] 1. A partition wall (2) having a hollow portion (2a) having a diameter through which an existing buried pipe (T1) can be inserted is provided in the skin plate (1), and a cutter drum device (10) is provided in the partition wall (2). ) is rotatably supported, and a drive motor (3, 3, 3...) is fixed to the outer periphery of the hollow part (2a) of this partition (2), and further, Each pinion (3a) arranged on the drive shaft of the drive motor (3, 3, 3...) is meshed with a ring-shaped gear (12) fixed to the support ring part (11), and The cutter drum device (10) has a hollow space (
14), and a plurality of excavating soil upper blades (15) are installed radially within the cutter chamber (16) of the cutter drum device (10). A shield excavator (100) in which elastic scraping plates (17) for scraping off earth and sand adhering to the outer periphery of the existing buried pipe (T1) are connected to the inner end of each excavated soil scraping upper wing (15). The shield tunneling machine (100) is installed in such a state that the existing buried pipe (T1) whose diameter is to be expanded is inserted through the hollow part (14) and hollow part (2a), and the existing buried pipe (T1) is inserted through the hollow part (14) and hollow part (2a). (T1) has its upper part cutter chamber (16
) and remove the existing buried pipe (T
1) Place the earth removal device (18) above so that its tip reaches into the cutter chamber (16),
After excavating the outer ground of the existing buried pipe (T1) for a desired distance using the shield excavator (100), when constructing a new buried pipe (T2) in the shield excavator (100) using a conventional method, a new A method for expanding the diameter of an existing buried pipe, which is characterized in that an existing buried pipe (T1) that has entered a shield excavator (100) is removed by advancing the upper part thereof.