JPH0520557B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a buried pipe propulsion method for forming a cable storage pipe underground.

(Prior art) Conventionally, when burying and forming this type of cable storage conduit underground, a large diameter propulsion pipe is placed at the rear end of an excavator having a cutter or the like at the tip.
This propulsion tube is pushed from behind with a pushing device such as a jack to propel it into the soil, and then a small diameter cable storage tube is inserted into this propulsion tube, and the gap between the propulsion tube and the cable storage tube is appropriately filled. The material was backfilled.

(Problems to be solved by the invention) However, with such conventional existing construction methods,
First, the large-diameter propulsion tube that serves as the sheath tube must be propelled and buried, then the cable storage tube is inserted into the propulsion tube, and then the filling material is injected and solidified, which must be done individually in sequence. , machinery and equipment suitable for these various operations are required. Moreover, in addition to the time and effort required for various different tasks, preparations for moving to the next task are time consuming, resulting in a large amount of effort, time, and cost.

(Means for Solving the Problems) This invention has been made in view of the above points, and instead of using the conventional large-diameter propulsion pipe that serves as a sheath pipe, the horizontal shaft itself that is created after the excavation machine is used. As a formwork, multiple cable storage conduits are moved simultaneously, and the gap between the ground and the cable storage conduits is filled and solidified with a solidifying material, and its specific structure is as follows: An appropriate number of cable storage pipes are arranged at the rear end of the excavator, and an appropriate number of solidification material discharge ports are provided at the rear end of the excavator, and these are inserted into the ground from the inner side of the starting shaft to store cables. While the rear end of the utility pipe is propelled by an appropriate pressing device such as a push jack, solidified material is simultaneously discharged from the discharge port, and the outer periphery of the cable storage pipe and the ground that are created behind the excavator are removed. This will fill the voids in the concrete and solidify it, forming an underground cable storage conduit.

(Function) The inner periphery of the horizontal shaft that is generated behind the excavator, that is, the ground, will be used as it is as the outer formwork for the solidification material, and any material from the cable storage pipe can be injected into the solidification material. The cable storage pipe may be used as the discharge route for the soil to be discharged.

Moreover, when the discharged solidifying material fills the void, it has pressure due to the discharge pressure and supports the ground.

The solidifying material will solidify in order from the one injected first, and the solidifying material will follow the direction of the excavator.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Reference numeral 1 denotes an excavator having an excavation means 2 such as a cutter at the front, and a bulkhead 3 at the rear of this propulsion device 1.
A rear chamber 4 is located across from the rear chamber 4.

This rear chamber 4 is provided with a drive device 6 for rotating the excavation means 2 and a screw conveyor 5 which is a means for moving excavated soil. In the sediment chamber 7 around the terminal end of the screw conveyor 5, a sliding space is secured for an outer cylinder 9 for taking in excavated soil by a pressure pump 8 serving as a sediment discharge means.
is configured to slide to take in the excavated soil from the earth and sand chamber 7, connect directly to the discharge port 10 of the bulkhead 3, and discharge the excavated soil to the rear by a piston (not shown) in the pressure pump 8. .

A discharge pipe 11 located below the rear chamber 4 is connected to the discharge port 10, and this discharge pipe 11 is inserted into the center of the rear end wall 12 of the propulsion device 1.

Six insertion holes for cable storage pipes are bored at the rear of the rear end wall 12, that is, on the side of the starting shaft 13, and in this embodiment, the back of the one insertion hole 33 located at the lower side is located in the rear end wall. Outlet pipe 1 in 12
It communicates with 1. Furthermore, the inner part of the insertion hole 14 located above is connected to a suitable number of solidification material discharge ports 15 provided on the rear end surface of the rear end wall 12 by a connecting pipe 16 inside the rear end wall 12. There is. The diameters of these insertion holes 13, 14, etc. are larger than the diameter of the cable storage tube to be buried, and when actually carried out, as shown in Figure 2, each cable storage tube to be buried is Appropriate coating materials 20, 21, 22 are applied around the insertion tips of the service tubes 17, 18, 19.
Cable storage tubes 17, 18, 1 covered with
9 and each insertion hole 14, 23, 33 is filled. By adopting such a configuration, there is a contact covering material 20, 21, 22 between each terminal end of the covering material 20, 21, 22 and the outer periphery of each cable storage pipe 17, 18, 19. A difference in level will occur due to the thickness.

For construction, each cable storage pipe 17, 18, 19 is set as shown in Fig. 2, and the insertion port 1 communicating with the solidification material discharge port 15 is set.
While injecting the solidifying material from the end of the cable storage pipe 17 inserted into the cable storage pipe 17 inserted into the cable storage pipe 4, the propulsion unit 1 is operated while injecting the solidification material from the end of the cable storage pipe 17 inserted into the cable storage pipe 17, 1.
Push ring 25 of push jack 24 at the rear end of 8, 19
Press with Then, the excavated soil produced by the excavation means 2 is transferred to the rear by the screw conveyor 5, and further discharged to the rear by the pressure pump 8 through the discharge pipe 11 and the cable storage pipe 19. be done.

In addition, as the propulsion device 1 excavates, the outer periphery of each covering material 20, 21, 22 and the ground that are generated behind the rear end wall 12, that is, the inner periphery of the horizontal shaft created by the excavation of the propulsion device 1. The gap between the two is immediately filled with the quick-drying solidifying material discharged from the discharge port 15.

Therefore, the speed of excavation is made to match the solidification speed of the solidification material, and the speed of excavation is adjusted so that solidification is completed by the time the solidification material discharged at a certain point is located at the end of each covering material 20, 21, 22. Once set, cable storage pipes can be buried continuously using the propulsion method. In addition, each cable storage 17, 18,
Holes formed by the solidified material that has been solidified when the cable 19 is propelled, that is, holes formed on the outer periphery of the covering materials 20, 21, 22, and each cable storage pipe 17, 18, 1
Since there is a gap equal to the thickness of the covering materials 20, 21, and 22 between the outer periphery of the covering member 9 and the outer periphery of the covering member 9, smooth propulsion is performed.

Further, since the solidification material is discharged with appropriate pressure and fills the space behind the excavator 1, the ground does not collapse. In FIG. 1, the areas indicated by dots represent the solidified material that has not been completely solidified, and the shaded areas represent the solidified material that has been completely solidified.

(Effect of the invention) According to this invention, the advancement of the cable storage pipe, the injection of the solidifying material, and the solidification all proceed at the same time. Compared to the work of inserting a cable storage pipe inside and then backfilling with filler, equipment and labor can be reduced, and the construction period can also be shortened.

Furthermore, since the solidification material is discharged under pressure and is completely filled, the ground will not collapse and the work can be carried out safely.

[Brief explanation of the drawing]

Each figure is a figure about an example, and FIG. 1 is a side explanatory view, FIG. 2 is a vertical sectional view of main parts, and
The figure is a sectional view taken along the line A--A in FIG. 1. In the figure, 1 is an excavator, 2 is an excavation means, 12 is a rear end wall, 17, 18, 19 are cable storage pipes,
20, 21, 22 are covering materials, and 24 is a base jack.

Claims (1)

[Claims] 1. Arrange an appropriate number of cable storage pipes at the rear end of the excavator, and provide an appropriate number of solidification material discharge ports at the rear end of the excavator, and insert these into the ground from the inner side of the starting shaft. While propelling the rear end of the cable storage pipe with an appropriate pressing device, solidified material is simultaneously discharged from the discharge port to fill the gap between the outer periphery of the cable storage pipe and the ground that is created behind the excavator. A continuous backfilling multi-line pipe propulsion method characterized by solidifying and forming underground cable storage conduits.