JP3217073B2 - Expanding method of existing buried pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing buried pipe for replacing an existing buried pipe with a new buried pipe having a diameter larger than the existing buried pipe at a position where the existing buried pipe was buried. The present invention relates to a pipe 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, use of a shield excavator that excavates the existing buried pipe with a cutter bit at the cutting face together with the ground is proposed.

[0003]

However, the existing buried pipe is made of concrete with reinforcing steel, lining with a steel segment, or furthermore, lining it with a steel segment to make the inner surface thereof. It may be concrete-lined (existing buried pipe T
Reference numeral 1 denotes a concrete lining on the inner surface of a steel segment S1 of a primary lining. ), It is impossible to excavate while crushing steel with the ground with the same cutter bit, and it is impossible to excavate due to entanglement of rebar and steel segment fragments with the cutter bit, In the present application, there is a drawback that efficient excavation cannot be performed due to inability to perform excavation.

Accordingly, the present invention has been made in view of the above-mentioned drawbacks, and the present invention provides an efficient method of expanding the diameter of an existing buried pipe by separately excavating an outer peripheral portion of the existing buried pipe T1 and removing the existing buried pipe T1. It is intended to provide a construction method.

[0005]

In order to solve the above-mentioned problems, the construction of the present invention, which has the above-mentioned claims, has been developed in order to solve the above-mentioned problems.
A partition 2 having a hollow portion 2a having a diameter through which the hollow portion 2a can be inserted is provided. The support ring portion 11 of the cutter drum device 10 is rotatably supported on the partition 2 and an outer peripheral portion of the hollow portion 2a of the partition 2 is provided. A ring-shaped gear in which the drive motors 3, 3, 3,... Are fixed, and each pinion 3a disposed on the drive shaft of the drive motor 3, 3, 3,. The cutter drum device 10 is provided with a cutter face portion 13 having a hollow portion 14 at the center thereof, through which the existing buried pipe T1 can be inserted. In the cutter chamber 16 of the device 10, a plurality of excavated soil upper wings 15 are radially mounted, and
The shield excavator 100, which is provided with an elastic scraping plate 17 for scraping earth and sand adhering to the outer periphery of the existing buried pipe T1, is used at the inner end of the excavation pipe 5, and the shield excavator 100 has an empty space 14 The existing buried pipe T1 is inserted into the cutter chamber 16 and the upper part of the buried pipe T1 is advanced to the inside of the cutter chamber 16 and removed. The excavator 18 is arranged so that its tip enters the inside of the cutter chamber 16 and the shield excavator 100 excavates the outer ground of the existing buried pipe T1 by a desired distance. When constructing a new buried pipe T2 in the shield machine 100,
Existing buried pipe T newly entering shield excavator 100
In this case, technical measures were taken in which the upper part of the vehicle 1 was advanced and removed.

[0006]

Therefore, the method of expanding the existing buried pipe of the present invention is the first method.
The shield excavator 100 is operated from the illustrated body, and the cutter drum device 10 is driven by the drive motors 3, 3, 3,.
Rotate to start digging. In this excavation, the propulsion force is obtained while extending the shield jack 21 (see FIG. 1) as in the related art. Then, the existing buried pipe T
1 is excavated by the cutter face portion 13, the excavated soil is taken into the cutter chamber 16 (hereinafter referred to as “swallowing” which is a normal expression), and the excavated soil is swallowed into the cutter chamber 16. With the rotation of the cutter drum device 10, the excavated soil scraped up by the excavated soil scraper upper wing 15 above the cutter chamber 16, and the excavated soil scraped up to the upper portion of the cutter chamber 16 is under its own weight, and the upper part is advanced removed. It falls into the existing buried pipe T1.

[0007] The excavated soil that has fallen into the existing buried pipe T1 (in this embodiment, a belt conveyor is used for the earth discharging device, so the excavated soil that has fallen onto the earth discharging device 18) is sequentially discharged in a later method. It is excavated while being soiled.

When the excavation of the desired distance is completed, the excavation is temporarily stopped, and a new buried pipe T2 is constructed in the shield excavator 100 by an ordinary method. That is, the segment ring R is assembled in the space formed by contracting the shield jack 21, and the lining of the newly buried pipe T2 is performed.

When the above-mentioned newly buried pipe T2 is constructed, the existing buried pipe T1, which has newly entered the shield machine 100, is advanced to its upper part and removed to return to the state shown in FIG. By repeating this process sequentially, the existing buried pipe T1 can be sequentially renewed into a newly buried pipe T2 so as to exhibit an effect of increasing the diameter.

The removal of the existing buried pipe T1 may be carried out by using a mechanical or human-powered conventionally known various removal apparatus. In addition, the cutter chamber 1 of the existing buried pipe T1 is removed.
For the part that has newly entered inside 6, advanced removal of its upper part is always necessary prior to the next excavation, but the entire removal of the rear end of the existing buried pipe T1 is not particularly limited in its removal time. Instead, after excavation or after assembling a plurality of segment rings, they may be removed in a lump corresponding to the excavation distance.

[0011]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

In the drawing, T1 is an existing buried pipe, and in the present invention, the existing buried pipe T1 is renewed, and a new buried pipe T2 having a diameter larger than the existing buried pipe T1 is buried. It is intended to be built in a different position.

According to the method of the present invention, a partition 2 having a hollow portion 2a having a diameter through which an existing buried pipe T1 can be inserted is provided in a skin plate 1, and a cutter drum device 1 is provided in the partition 2.
., And the drive motors 3, 3, 3,... Are fixed to the outer peripheral portion of the hollow portion 2a of the partition wall 2.
Each of the pinions 3a arranged on the drive shafts of 3, 3,... Is engaged with a ring-shaped gear 12 fixed to the support ring portion 11, respectively. Is provided with a cutter face portion 13 having an empty portion 14 through which the existing buried pipe T1 can be inserted, and further, a cutter chamber 1 of the cutter drum device 10 is provided.
In 6, a plurality of excavated earth wings 15 are radially mounted,
An existing buried pipe T1 is provided at the inner end of each
A shield excavator 100 in which elastic scraping plates 17 for scraping earth and sand adhering to the outer periphery of the shield excavator 100 are respectively provided.

The shield machine 100 employs a peripheral support system for supporting the cutter drum device 10 in order to insert the existing buried pipe T1 into the center thereof. In the partition 2, the existing buried pipe T1 is inserted through the hollow portion 2a. Although the spoke face type is used as the cutter face portion 13 in the illustrated example, this is usually because the ground at the outer peripheral portion of the existing buried pipe T1 is often stable. Needless to say, a conventionally known cutter face portion of an adjustable type may be used.

The partition wall 2 has an inner peripheral end surface (first surface).
The left side of the figure) has a ring groove 2b for rotatably supporting a support ring portion 11 of a cutter drum device 10 described later, and further has an inner peripheral end face for closing a gap with the outer peripheral surface of the existing buried pipe T1. A packing ring 18 is provided.

In the example shown in FIG. 2, the partition wall 2 has an outer peripheral end fixed to the skin plate 1 and is fixed to an outer peripheral fixing ring 2 ', and is slidably fitted into the outer peripheral fixing ring 2'. The sliding ring 2 "is a sliding ring 2". The sliding ring 2 "is a sliding hydraulic cylinder 22, 22, 22,.
The slide ring 2 "is provided with the ring groove 2b. The slide ring 2" is provided with a ring groove 2b. Although not shown in the drawing, a ridge parallel to the central axis is provided on the outer periphery of the outer ring, and a key-shaped groove into which the ridge is fitted is provided on the outer peripheral fixing ring 2 ′. Can slide in the axial direction, but its rotation is restricted.

Further, the cutter drum device 10 has a hollow portion 14 at the center of the distal end surface thereof through which the existing buried pipe T1 can be inserted, and a plurality of excavated earth wings 15 in a cutter chamber 16. Radially mounted, and at the inner end of each excavated earth wing 15 an elastic scraping plate 17 for scraping off the earth and sand adhering to the outer periphery of the existing buried pipe T1 is connected in series. It has the same structure, but has a support ring portion 11 at its rear end, and this support ring portion 11 is fitted and supported in the ring groove 2b via a bearing 2c or the like. A ring-shaped gear 12 (internal gear) is fixed to the rear end face of the support ring portion 11, and the ring-shaped gear 12 is loosely inserted into the ring groove 2b.

Further, the drive motors 3, 3, 3,...
Are fixed to the rear end face of the partition wall 2, and the drive shafts thereof enter the ring grooves 2 b, and the respective pinions 3 a arranged on the drive shafts
Are respectively engaged with the ring-shaped gear 12 to drive the motors 3,
The cutter drum device 10 is rotated by 3, 3,....

Therefore, the shield machine 100
Is that the cutter drum device 10 is rotated by the drive motors 3, 3, 3..., And the cutters 40, 40, 40. However, in the case of FIG. 2, when the excavation is temporarily interrupted and excavated again, when a large earth pressure is applied to the cutter drum device 10 due to the expansive ground or the like, the hydraulic cylinders 22, 22 are used. , 22,..., The cutter ring device 10 is moved backward, and then the cutter drum device 10 is rotated to facilitate starting. In FIG. The overcutter, 19b is a tail seal, and 19c is a segment elector.

According to the method of the present invention, the shield machine 100 is installed in such a manner that the existing buried pipe T1 which expands the hollow portion 14 and the hollow portion 2a of the digging machine 100 is inserted therein. The upper part is advanced and removed to the inside of the cutter chamber 16, and the earth discharging device 18 is arranged on the existing buried pipe T1 such that the tip thereof enters the inside of the cutter chamber 16. That is, the shield excavator 100 is arranged in the state shown in FIG. 1, in which the excavation is interrupted, and the earth discharging device 18 (a belt conveyor was used in the illustrated embodiment, but a screw conveyor or the like) It goes without saying that the operator may ride on the sled 32 and enter the cutter chamber 16 on the tip side from the bulkhead 2 to advance the upper part of the existing buried pipe T1 and remove it. Work is being performed.

Then, after digging the outer ground of the existing buried pipe T1 by a desired distance with the shield digging machine 100, when constructing a new buried pipe T2 in the shield digging machine 100 by a conventional method, a new shield digging is performed. The existing buried pipe T1 that has entered the machine 100 is advanced at its upper part and removed. That is, the worker retreats from the illustrated state, removes the sled 32, and drives the cutter drum device 10 by the driving motors 3, 3, 3,.
Rotate and excavate. Then, as described above, the excavation or the lining of the newly-built segment buried pipe T2 is performed by the ordinary method, and the buried pipe T1 apparently enters the shield excavator 100 with the excavation. Then, the existing buried pipe T1 may be removed with its upper part advanced.

[0022]

Since the method of the present invention is as described above,
The excavation of the face is performed by the shield excavator 100, and the removal of the existing buried pipe T1 does not use the shield excavator 100. Therefore, even if the existing buried pipe T1 contains steel such as rebar, the excavation can be performed rationally, An object of the present invention is to provide a method of expanding the diameter of an existing buried pipe, which can prevent the steel from being entangled with the cutter bit.

[Brief description of the drawings]

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

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

[Explanation of symbols]

 DESCRIPTION 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 Raising wing 13 Cutter face part 14 Empty part 16 Cutter chamber 17 Elastic scraping plate 18 Earth removal device 100 Shield excavation Machine T1 Existing buried pipe T2 New buried pipe

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 1/024

Claims (1)

(57) [Claims] A partition (2) having a hollow portion (2a) having a diameter through which an existing buried pipe (T1) can be inserted is provided in a skin plate (1), and a cutter drum device (10) is provided in the partition (2). ) Is rotatably supported, and drive motors (3, 3, 3,...) Are fixed to the outer peripheral portion of the hollow portion (2a) of the partition wall (2). Each pinion (3a) arranged on the drive shaft of the drive motor (3, 3, 3...) Is engaged with a ring gear (12) fixed to the support ring portion (11), respectively. In the cutter drum device (10), a cutter face portion (13) having a hollow portion (14) in the center thereof through which the existing buried pipe (T1) can be inserted is disposed at a tip end portion thereof,
Further, a plurality of excavated earth wings (15) are radially mounted in the cutter chamber (16) of the cutter drum device (10), and an inner end of each of the excavated earth wings (15) is provided. The shield excavator (100) is provided by using a shield excavator (100) in which elastic scraping plates (17) for scraping earth and sand adhering to the outer periphery of the existing buried pipe (T1) are respectively connected.
Is installed in a state where an existing buried pipe (T1) for expanding the hollow portion (14) and the hollow portion (2a) is inserted, and the upper portion of the existing buried pipe (T1) has a cutter chamber (1).
6) While being advanced to the inside and removing it, the earth removal device (18) is arranged on the existing buried pipe (T1) so that the tip thereof enters the inside of the cutter chamber (16), and the shield is placed. With the excavator (100), the existing buried pipe (T
After digging the outer ground in the desired distance of 1), when constructing a new buried pipe (T2) in the shield digging machine (100) by an ordinary method, the existing digging machine (100) newly entering the shield digging machine (100) is used. A method of expanding the diameter of an existing buried pipe, characterized in that the buried pipe (T1) is advanced and its upper part is removed.