JPH11324011A - Method and device for excavating periphery of underground embedded material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To complete excavation of a pavement in a short time and reduce the occupied time of a road as much as possible and further, prevent the paved road from settling even after back-filling. SOLUTION: A pavement road slab 1 is circularly cut and removed and a protection ring is installed to protect the edge of the pavement face. A casing 5 having a roller at the upper face is installed and the casing is forced to settle by excavaing while exert a pressure on the casing 5 by an excavator 4, and the ground is excavated down to a target level. In a back-filling process, excavated soil is returned to the hole and mixed with a solidifying material in the hole and then, the ground is rolled to prevent the road face from settling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gas pipe, a water pipe,
The present invention relates to an excavation method for constructing an underground buried object such as a buried casing and for use in a test excavation for confirming an underground buried object.

[0002]

2. Description of the Related Art Conventionally, a pavement road surface has been cut into a square with a rotary cutter and excavated, and the earth and sand around the upper part of the underground buried object has been excavated and excavated.

[0003]

In this conventional excavation method, cutting of the pavement slab, excavation of earth and sand, and earth retaining are required, so that it takes 2-3 days to complete the construction,
The period during which road traffic was restricted was relatively long, hindering smooth traffic.

Therefore, the present invention overcomes this drawback, completes excavation in a short time by simultaneously performing earth retaining and excavation, shortens the occupation period of the road as much as possible, and furthermore, the settlement of the paved roadbed even after backfilling. The goal is to make sure that no events occur.

[0005]

Means for Solving the Problems The pavement slab is cut in a circular shape and removed, the casing is installed, and the inside of the casing is excavated while applying pressure to the casing with an excavator via rollers to minimize the cutting area. At the same time, the casing is submerged while excavating the ground, so that the casing also serves the role of the soil after excavation. A protection ring for protecting the edge of the circular hole formed in the pavement slab was installed to protect the rim of the pavement slab so as not to adversely affect the pavement slab. In the backfilling process, the excavated soil was returned into the hole, and the excavated soil and the consolidated material were mixed in the hole and rolled to prevent road surface settlement after restoration.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An excavation method will be described with reference to the process charts of FIGS. In this example, a steel pipe P such as a gas pipe is dug. First, the center position is obtained on the pavement road surface, and the pavement road surface 1 is cut by the circular cutter 2.

A hole is drilled in the center of the pavement slab 11 cut by the circular cutter 2, and a lifting tool having a diameter-enlarging member is inserted into the pavement slab 11 to expand the diameter-enlarging member. Let it go inside, pull it up with a crane and remove it.

A protective ring 3 having a flange 32 provided on an upper edge of a ring 31 is installed in a hole formed by removing the pavement slab 11 to prevent the edge 11 of the pavement road surface from dropping by an excavator or a casing. I do.

Then, an initial excavation is performed by the screw auger 4. The initial excavation is performed by excavating and excavating the roadbed 12 and the roadbed 13 to a depth where the casing 5 can be installed.

The casing 5 comprises a lower casing 51 and an upper casing 52, and is connected to a projection 61 by a joint plate 62 having a joint hole to obtain a required length. The joint plate 62 is provided on the outer surface of the casing so that the screw does not collide during excavation. A flange 53 is provided on the upper edge of the upper casing 52 together with a reinforcing rib.
Is provided. During excavation, the pressure ring 41 of the screw auger 4 rotates on the roller 54 while pressing the casing.

[0011] The upper casing is connected to the lower casing, installed in the hole, and the screw auger 4 excavates and discharges the inside of the casing 5. A pressure ring 42 is provided on the upper part of the screw 41 of the screw auger 4. During the excavation, the pressure ring 42 presses while rotating over the casing by the rollers 54 of the upper casing 52, and excavates the casing into the hole. Push in.

According to the depth, the lower casing is extended and excavated to a required depth. When excavating to the buried pipe P with the screw auger 4, there is a risk of damaging it. If excavating to a certain depth, stop the machine digging, and then excavate to the underground buried object while checking the underground buried object manually and finish. I do.

When the confirmation of the underground buried object or the work on the steel pipe is completed, the excavated earth and sand is backfilled. After backfilling about half, cement-based cement is put into the hole and mixed with backfill soil by stirring. The stirrer 7 has a plurality of arms 72 attached radially downward from a central axis 71, and a stirrer 73 is provided at the tip of the arm. When the backfill soil and the consolidation material are sufficiently mixed, the backfill soil is compacted. The backfilling and compaction are performed in about three times when the excavation depth is about 1.2 meters.

The casing is pulled out with a crane. In the figure, the pressure ring 42 of the screw auger 4 and the upper casing flange are connected by a wire and pulled out. Finally, remove the protection ring and refill the rest. After the roadbed is formed, paving is performed with quick-setting concrete and traffic is released after curing.

[0015]

According to the present invention, the pavement slab is cut and removed with a circular cutter,
Since the casing is excavated while being pressurized, the work can be performed efficiently and the work time can be reduced. The casing is installed, and the casing is excavated while applying pressure to the casing with an excavator, and the casing is submerged and excavated to a target location. Since the excavated soil and the consolidation material are mixed in the hole, no mixing equipment is required, and road surface settlement is prevented after the road surface is restored.

[Brief description of the drawings]

FIG. 1 is an excavation process diagram of the present invention.

FIG. 2 is a recovery process diagram of the present invention.

FIG. 3 is a perspective view of a protection ring.

FIG. 4 is a perspective view of a stirrer.

FIG. 5 is a front view of a casing.

FIG. 6 is a perspective view of a joint portion of a casing.

FIG. 7 is a front view of the excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pavement road surface 11 ... Pavement road slab 2 ... Circular cutter 3 ... Protective ring 4 ... Screw auger 5 ... Casing 7 ... Stirring tool

Claims (11)

[Claims] 1. A method of excavating underground buried objects in which a pavement slab is cut in a circular shape and removed, a casing is installed, and the casing is excavated through a roller while applying pressure to the casing with an excavator. 2. The excavating method according to claim 1, wherein the casing is installed after initial excavation of the ground. 3. The method according to claim 1, wherein a protection ring is provided in a circular hole of the pavement slab to protect an edge of the pavement slab. 4. The method according to claim 1, wherein a plurality of casings are connected to each other around the underground buried object. 5. The method according to claim 1, wherein excavation is stopped by the excavator at a depth smaller than the depth of the underground object, and the underground object is excavated by human power. 6. A backfill method in which excavated soil is returned into the hole after excavation by the excavation method according to claim 1, and the excavated soil and the consolidated material are mixed in the hole. 7. A pavement edge protection ring having a flange on the upper edge of a circular ring. 8. A casing provided with a roller on an upper edge. 9. The casing according to claim 8, wherein a joint member is provided on a lower edge. 10. A backfill stirring tool comprising a plurality of arms extending radially downward from a central axis and a stirring blade at a tip of the arm. 11. A screw auger provided with a pressure ring above a screw blade.