JPH054487B2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" This invention improves the open shield machine used for burying water and sewerage pipes, boxes, etc., and buries them in the path of the open shield machine. This article relates to a construction method for avoiding cross-buried objects and the open shield machine used for this method.

``Prior Art'' An open shield machine is used when laying underground objects such as water and sewer pipes and boxes into open-cut trenches. This open shield machine is
It mainly consists of left and right side plates and a frame to which the side plates are attached, and is equipped with a propulsion jack that allows it to move forward while linking with an excavator such as a backhoe to perform work on laying newly constructed buried objects.

By the way, underground objects such as large and small water and sewage pipes, gas pipes, telephone cables, etc. are buried under roads in urban areas, crossing the roads. Among these, small-diameter water pipes and other pipes will be hung and cut in advance, but large-diameter pipes will be difficult to relocate, so they will be suspended and protected in advance. The open shield machine that had been advanced was pulled up just in front of the suspended protection area and reinstalled immediately after the suspended protection area. The burying of the suspension protection area will be done separately from the salvage and reinstallation of the open shield machine.

As a construction method different from this, for example,
There is a construction method disclosed in ``Method and device for constructing underground structures'' described in Publication No. 14919. This construction method is
Approximately the upper half of the side plate of the open shield machine is made into a split movable side plate, and the open shield machine moves forward while avoiding underground obstacles such as cross pipes, i.e. buried objects, by moving the split movable side plate. shall be.

``Problem to be solved by the invention'' Needless to say, the former requires a great deal of time and expense since it is necessary to salvage and install the open shield machine.

In addition, in the latter case, salvage of open shield aircraft,
Although installation is not required, each time a buried object passes, the split movable side plate must be removed, moved, and reattached, which takes time and money, and poses a danger to workers. .

Furthermore, in order to allow the open shield machine to pass through the buried object while avoiding it, it is troublesome to remove the support member that supports the split movable side plate portion and to reattach it after passing. Note that this support member is essential in order to protect the split movable side plate portion from earth pressure.

``Means for Solving the Problems'' Therefore, the present invention aims to provide a construction method that eliminates the drawbacks of the conventional construction methods and conventional open shield machines, and that can easily and safely avoid crossing buried objects, and an open shield machine used therefor. The purpose of this website is to provide the following information, and its main structure is as follows.

As shown in FIG. 1, the frame and side plates of the open shield machine 1 are divided into upper and lower parts to form an upper frame 2, a lower frame 3, a movable side plate 4, and a fixed side plate 5. By lowering it together with the frame 2, the open shield machine 1 is made to pass below the crossing buried object 11.

As mentioned above, the open shield machine 1 used in this construction method has a frame consisting of an upper frame 2 and a lower frame 3, and a movable side plate 4 and a fixed side plate 5.
It is divided into upper and lower sections. The movable side plate 4 is attached to the upper frame 2, and the fixed side plate 5 is attached to the lower frame 3. Elevating means 6 for elevating the movable side plate 4 together with the upper frame 2 is provided.

Note that the propulsion jack is not shown.

"Function" As shown in FIG. 1A, if there is a cross-sectional buried object 11 such as a large-diameter pipe in the path of the open shield machine 1, which moves forward while laying a new buried object 12, immediately before the cross-buried object 11, Then, the movable side plate 4 is lowered by the elevating means 6 and passed through the open shield machine 1 as shown in FIG. 1B.

After the open shield machine 1 passes through the buried object 11, the movable side plate 4 is raised by the elevating means 6, and normal laying work is performed as shown in FIG. 1C.

``Effects'' Since there is no need to cut around the cross-buried objects, and there is no need to raise and install an open shield machine, it is possible to continuously perform new burial work, including below the cross-buried objects. Therefore, it is possible to shorten the construction period and reduce construction costs.

Since there is no need to move or install the side plates or side plate support members, highly safe and smooth construction is possible.

"Embodiments" Hereinafter, the present invention will be explained in detail based on the embodiments shown in FIGS. 2 to 4.

1 is an open shield machine, whose frame is divided into front and rear and upper and lower parts, and includes a front upper frame 2a,
a rear upper frame 2b and a front lower frame 3a,
A rear frame 3b is formed. The side plates are also divided into front and rear and upper and lower parts to form a front movable side plate 4a, a rear movable side plate 4b, a front fixed side plate 5a, and a rear fixed side plate 5b. The front movable side plate 4a is attached to the front upper frame 2a, the rear movable side plate 4b is attached to the rear upper frame 2b, the front fixed side plate 5a is attached to the front lower frame 3a, and the rear fixed side plate 5b is attached to the rear lower frame 3b. It is being Therefore, the open shield machine 1 is composed of a front part 1a and a rear part 1b.

Reference numeral 6a denotes a front lifting jack of the lifting means, which connects the front upper and lower frames 2a and 3a, and two are provided on each side. 6b is also a rear lifting jack of the lifting means, and the rear upper and lower frames 2b, 3
b are connected, and two are similarly provided on the left and right.

7a is the front upper frame 2a and the rear upper frame 2
There are upper propulsion jacks that connect b and one on each side are removably attached. Similarly, 7b is a lower propulsion jack, which connects the front lower frame 3a and the rear lower frame 3b, and is detachably attached to three on each side.

The front and rear movable side plates 4a and 4b slide on the outer surfaces of the front and rear fixed side plates 5a and 5b, respectively, and are connected to the front and rear lifting jacks 6a and 6b.
It is configured to be raised and lowered by the operation of the

8 is a hydraulic unit which operates the front and rear lifting jacks 6a, 6b and the vertical propulsion jacks 7a, 7b individually or simultaneously. 9 is a removable reaction force plate.

In addition, the front movable side plate 4a and the rear movable side plate 4b,
The front fixed side plate 5a and the rear fixed side plate 5b can be connected to and released from each other using fasteners such as bolts and nuts (not shown).

From the above configuration, in normal excavation work as shown in Fig. 2, the front and rear movable side plates 4a and 4b are pulled up,
Both movable side plates 4a, 4b are connected, and front and rear fixed side plates 5a, 5b are also connected. A buried object 1, such as a box, for example, is placed in a trench 21 dug by an excavator such as a box hoe (not shown) until just before the cross-sectional buried object 11.
2 will be installed one after another. When moving the open shield machine 1 forward, first, the front and rear movable side plates 4a,
4b and the front and rear fixed side plates 5a and 5b are connected, and the reaction force is taken by the backfilled soil of the newly installed buried object 12 and the backfilled soil of the rear lower frame 3b, and the vertical propulsion is carried out. The jacks 7a and 7b are extended to advance the front portion 1a, rear movable side plate 4b, and rear fixed side plate 5b of the open shield machine 1.

Next, the vertical propulsion jacks 7a and 7b are retracted, and the rear vertical frame 2 of the open shield machine 1 is moved.
Move b and 3b forward.

Note that it is also optional to configure the open shield machine 1 to move forward by applying the lower propulsion jack 7b to the buried object 12.

As shown in Figures 3 and 4, open shield 1
Immediately before a cross-sectional buried object 11 such as a large-diameter pipe in the path of
After removing the upper propulsion jack 7a, the front lifting jack 6a is retracted to lower the front movable side plate 4a. After applying suspension protection 13 to a heavy cross-buried object 11 such as a large-diameter pipe, the front part 1a
excavate inside. At the same time, the installation of the buried object 12 in the rear part 1b continues.

Next, remove the reaction plate 9 and attach the rear movable side plate 4.
b is lowered by the rear lifting jack 6b, and the front part 1a is moved forward as described above by taking the reaction force from the backfill soil of the rear lower frame 3b, and then passed under the cross-buried object 11 to move the rear part 1a forward. 1b is advanced. The front movable side plate 4a is raised again to carry out the laying work, and when the rear part 1b has completely passed through the crossing buried object 11, the rear movable side plate 4b is raised.

In addition, in the embodiment, the open shield machine 1 is divided into front and rear parts, but it is also possible to combine them into one piece as shown in FIG. Further, it is also possible to use a manual jack instead of a hydraulic jack as the longitudinal lifting means, or to use other known means.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the basic structure of the present invention, in which A shows the open shield machine just before the buried object to be crossed, B shows the object while it is passing, and C shows the object after it has passed. Second
Figures 4 to 4 show examples of the open shield machine, Figure 2 is a side view of the open shield machine with one side plate removed just in front of the buried object, and Figure 3 is a side view of the open shield machine with one side plate removed. FIG. 4 is a partially cutaway side view of the front part passing through the buried object, and FIG. 4 is a rear view thereof. 1... Open shield machine, 2... Upper frame, 3... Lower frame, 4... Movable side plate, 5...
Fixed side plate, 6... Lifting means (jacket), 11...
...Cross-buried objects, 21...Ditch.

Claims (1)

[Claims] 1. In open cutting using an open shield machine, the frame and side plate of the open shield machine are divided into upper and lower parts, respectively, to form an upper frame and a lower frame, a movable side plate and a fixed side plate, A construction method for avoiding cross-section buried objects using an open-shield machine, characterized in that the open-shield machine passes under the cross-section buried objects by lowering the movable side plate together with the upper frame. 2 The frame of the open shield machine is divided into an upper frame and a lower frame, and the side plate is also divided vertically into a movable side plate and a fixed side plate.The upper frame has a movable side plate, and the lower frame has a fixed side plate. An open shield machine characterized in that the movable side plates are attached to each other and a lifting means is provided for raising and lowering the movable side plate together with the upper frame. 3. The movable side plate and the upper frame, as well as the fixed side plate and the lower frame, are each divided into front and rear parts, and are provided with elevating means for elevating the front movable side plate and elevating means for elevating the rear movable side plate. The open shield machine according to claim 2. 4. The open shield machine according to claim 2 or 3, wherein the lifting means is a jack.