JPS63259288A - Method of executing double pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a method for constructing double pipes.

<Prior Art> As a countermeasure against water leakage in water and sewage pipes, it is known to construct a double pipe by inserting a separate inner pipe such as a Huum pipe into an outer pipe that has been previously constructed.

This laying method is generally performed in the following steps.

(1) Build the outer tube.

(2) Lower the inner pipe into the shaft.

(3) Place the suspended inner pipe on a trolley and transport it into the outer pipe.

(4) While adjusting the level of the inner tube, sequentially connect and extend the inner tube to the outer tube.

(5) A cementing material such as mortar is filled between the outer pipe and the inner pipe for waterproofing.

Problems to be solved by the present invention> Large diameter outer pipes are often laid bent.

Furthermore, the gap between the circumferential surfaces of the outer tube and the inner tube is designed to be so small that it does not allow any workers to enter due to construction cost considerations.

Therefore, it takes a lot of time and effort to perform various tasks such as positioning, centering, inserting, connecting, and fixing the inner pipe, and the workability is extremely poor.

In particular, since the work of pushing a separate inner tube into the rear of the inner tube that has already been installed with its center out requires manual labor, it is extremely difficult to accurately center the inner tube and connect it. be.

Furthermore, when extending the inner pipe, in order to accurately find the center of the inner pipe, it is necessary to rely on the intuition and skill of the surveyor, and there is therefore a problem in that the accuracy of laying remains unsatisfactory.

OBJECT OF THE INVENTION The present invention has been made to solve the above-mentioned problems.
The purpose of the present invention is to provide a method for constructing a double pipe which requires no labor for centering or connecting inner pipes and has excellent workability.

Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

First, the main equipment used in this example will be explained. (Figures 1 to 3) Bogie The bogie 1 has the function of transporting and moving the inner tube 3 within the outer tube 2 that has been laid in advance, and the height adjustment of the installed inner tube 3 in any direction. This is a transport vehicle that has two functions:

This trolley 1 has a plurality of running wheels at its lower part, and is configured to be self-propelled or to be driven manually by a worker.

Furthermore, a plurality of front push-up jacks 4 and rear push-up jacks 5 are provided at both front and rear ends of the platform 1, facing upward.

Each push-up jack 4.5 consists of two jacks, and each push-up jack 4.5 facing each other is installed so as to be inclined inward.

Each of these jacks 4.5 is configured to expand and contract based on a control signal from a control section 6, which will be described later.

A target 7 is set inscribed in the rear end of the inner tube 3 mounted on the target trolley 1.

As this target 7, a known target having a large number of light receiving elements arranged on its plate surface can be used.

Further, an output cable is connected to each light receiving element, and each output cable is guided to the control section 6.

Furthermore, when the light receiving element group of the target 7 receives the laser light from the surveying instrument, it is configured to analyze the light receiving point and transmit it to the control unit 6 as X-axis and Y-axis coordinate signals.

Control unit As the control unit 6, a general-purpose computer or the like having an arithmetic function for calculating the stroke lengths of the front push-up jack 4 and the rear push-up jack 5 based on coordinate signals from the target 7 can be used.

The control unit 6 inputs the axial center of the inner pipe 3 as a coordinate value in advance, calculates the coordinate value of this axial center, and the direction and amount of deviation from the installation design line, and outputs it to each push-up jack 4.5. It is configured so that it can be done.

2> Support device The support device 8 is a member whose purpose is to support the inner tube 3, which is accurately centered, in a suspended state within the outer tube 2.

This support 8 consists of a support port 81 and a U-shaped U-shaped fitting 83 that is screwed onto both ends of the support port 81 via nuts 82.
By moving the screwing position of the U-shaped metal fittings 83, the support interval of the U-shaped metal fittings 83 can be adjusted.

It is also conceivable to attach a double-sided tape or the like to the outermost end surface of the U-shaped metal fitting 83 to prevent slipping during setting and to protect the pipe body.

It is also conceivable to form a through hole for the support bolt 81 in the plate surface of one of the U-shaped metal fittings 83 to allow the U-shaped metal fitting 81 to freely tilt.

Effect of the present invention> Next, the construction method will be explained. (Figure 1.4) <1> Construction of outer tube An outer pipe 2 is laid between the starting shaft and the reaching shaft.

The outer pipe 2 is laid by a shield construction method using a known shield machine.

2> Laying of the preceding inner pipe Next, the inner pipe 3a to be laid is lowered into the starting shaft.

The suspended inner pipe 3a is mounted on a trolley l and transported to the reaching shaft side using the inside of the outer pipe 2 as a running path.

Then, a plurality of sets of supports 8 are interposed and laid between the front and rear peripheral surfaces of the inner tube 3a and the outer tube 2.

3> Transportation of the inner pipe for extension Next, the inner pipe for extension 3b is mounted on the trolley 1 and transported to the vicinity of the existing inner pipe 3a.

Then, a target 7 is set at the rear of the inner tube 3b.

At this time, the center of the target 7 is set to match the axis of the inner tube 3b.

4> Aligning the inner tube for extension To align the center of the inner tube 3b with the design line, proceed as follows.

First, a laser beam is emitted from a surveying instrument attached to the rear of the inner tube 3b and adjusted so that the laser beam is emitted on the same line as the design line.

Then, the laser beam hits a part of the target 7 set in the inner tube 3b.

Since the laser beam exists on the design line, the inner tube 3
In order to match b with the design line, the laser beam must be aligned with the target 7.
What is necessary is to move the inner tube 3b in the direction where it is located at the center.

That is, for example, when the inner tube 3b is mounted on the trolley 1 with the inner tube 3b positioned lower right than the design line as shown in FIG. It does not coincide with the axis P2 of the inner tube 3b, and is located above and to the left of the axis P2.

Then, the light receiving element on the target 7 transmits the light receiving position of the point PI to the control unit 6 as a coordinate signal.

The control unit 6 calculates the stroke length of each front push-up jack 4 and rear push-up jack 5 based on the coordinate signal from the target 7, and transmits the calculated stroke length to each push-up jack 4.5.

As a result, each of the four sets of front push-up jacks 4 and rear push-up jacks 5 extends by a predetermined amount, and the axis P2 of the inner tube 3b gradually approaches the point P1 where the laser beam is received on the target 7. , match at the end.

When the axis P2 coincides with and overlaps the point PL, the expansion and contraction operations of each push-up jack 4.5 stop.

All the operations of the push-up jacks 4.5 from the expansion/contraction operation to the stop are automatically controlled by the control section 6.

Connecting the inner tube for extension of the inner tube 5 With the laser beam receiving point P1 aligned with the axis P2 of the inner tube 3b, the inner tube 3b is moved toward the existing inner tube 3a and connected.

The forward movement of the trolley 1 is carried out either by self-propulsion or by a worker pushing it by hand.

In this state, between the rear outer circumference of the inner tube 3b and the inner circumference of the outer tube 2,
It is temporarily fixed with the support 8 interposed.

6> Retraction of the truck Next, after contracting all the push-up jacks 4.5, the truck 1 is pulled back from the inner tube 3b.

As a result, the inner tube 3b is laid in a suspended state with its front portion supported by the rear portion of the existing inner tube 3a and its rear portion supported by the support 8.

By repeating the above steps, the inner tube 3 for extension is successively connected, and the double tube made up of the inner tube 3 and the outer tube 2 is extended.

7> Injection of consolidation material A consolidation material such as mortar is injected between the circumferential surfaces of the inner tube 3 and outer tube 2.

The method for filling the caking material is to insert a filling hose between the circumferential surfaces of the inner and outer tubes 3.2 and fill the caking material without pulling back the filling hose, or to fill the caking agent while the inner tube 3 is being connected. It is also possible to adopt a method of dividing the filling area by dividing the filling area with .

Other Embodiments> In the embodiment described above, the target 7 and each push-up jack 4.5 are interlocked via the control unit 6, and the inner pipe 3 is mounted on the truck 1.
Although the case has been described in which the mounting position of the front push-up jack 4 and the rear push-up jack 5 are automatically controlled, it is also possible to remotely control the expansion and contraction operations of the front push-up jack 4 and the rear push-up jack 5 on site.

In addition, although the connection operation described above is performed when the axis of the inner pipe 3b mounted on the trolley 1 is lower than the axis of the existing inner pipe 3a, it is of course possible to adopt the connection operation even in the reverse case. It is.

Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

(a) Operations such as positioning, centering, and connection of the inner tube can be automatically controlled mechanically without relying on human power.

Therefore, the work of laying the inner pipe becomes easy, and the workability of the inner pipe becomes extremely good.

(b) Since the work of centering the inner pipe is easy, the accuracy of laying the inner pipe is improved compared to conventional laying techniques.

(c) It can be performed efficiently without being affected by the expansion or narrowing of the space between the peripheral surfaces of the outer tube and the inner tube.

(d) It is possible to automate the installation work of the inner pipe.

[Brief explanation of drawings]

First drawing: An explanatory diagram of an embodiment of the present invention Perspective view of the second construction truck Figure 3: Perspective view of support Figure 4: Explanatory diagram when adjusting the height of the rear part of the inner tube Figure 3 81　Tii'rt"1L) 7 turn position 1st base

Claims (1)

[Claims] An inner pipe having a smaller diameter than the outer pipe is laid from one side of the outer pipe while being connected to form a double pipe, and a solidifying material is filled between the peripheral surfaces of the outer pipe and the inner pipe. In the double pipe construction method, a surveying instrument is installed on the proximal end of the inner pipe in line with the design line for laying the inner pipe, while a trolley equipped with a traveling function and multiple jacks pointing upward is installed. is placed inside the outer pipe, and the inner pipe to be laid inside the outer pipe is loaded onto the trolley and transported to the connection site where it will be connected to the existing inner pipe.Next, a target is set at the rear of the inner pipe mounted on the trolley. , is characterized by moving the truck forward while expanding and contracting the jack of the truck based on the light receiving point of the target and the axial center point of the inner tube set as the target, and connecting and laying the inner tube inside the outer tube. , Double pipe construction method.