JPH0543013B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of excavating a hole for laying a water pipe, a sewer pipe, a gas pipe, etc. on a road.

(Prior art) When laying pipes such as water pipes, sewer pipes, gas pipes, etc. on a road, steel sheet piles are continuously placed facing each other at predetermined intervals, and the spaces between these sheet pile rows are excavated and laid. A hole is formed and the installation pipe is buried.

As shown in FIG. 5, the conventional method of excavating a installation hole is to first dig a road surface 50 to a predetermined depth along the direction in which the installation pipe 57 is buried, form a shallow groove 51 with a predetermined width, and then 5 sheet piles with extra excavation on both sides
2, 52... are placed facing each other, and this sheet pile 52,
52... excavate between...

By the way, if the sheet pile 52 cannot stand up on its own due to the earth pressure due to the depth of excavation, brackets 53, 53 are welded to the inside of the upper part of the sheet pile 52, and these brackets 53, 53 are attached with ribs 54, 54 made of H-shaped steel or the like.
is erected horizontally along the sheet piles 52, 52, and reinforced by abutting a strut beam 55 made of H-shaped steel or the like between the double-side uprights 54, 54 to prevent the sheet pile 52 from tilting or collapsing due to earth pressure. After preventing this, the installation hole 56 is formed by excavating to a predetermined depth, and the installation pipe 57 is installed.

In addition, when installing water and sewerage pipes in areas with narrow road widths or roads with heavy traffic,
As shown in the figure, since the construction site must be used as a road during the day, H-shaped steel platforms 58, 58 are laid in the grooves 51 on both sides of the top of the sheet piles 52, 52, and a lining board 59 is erected on top of these. The road is temporarily open to traffic. Then, at night, the lining board 59 is removed and excavation and laying work is carried out.

In both of the above two conventional examples, when the installation work is completed, the installation hole 56 is backfilled with earth and sand, and the struts 55, uprights 54, etc. are removed, and the sheet piles 52,
52...is being pulled out.

(Problems to be Solved by the Invention) In the above-mentioned conventional example, in order to prevent the sheet piles from tilting due to earth pressure and to perform the laying work safely and easily, brackets are welded to the piles that have been placed so as to raise the piles. It was necessary to install reinforcing tools such as sills and struts, and it was also necessary to remove these reinforcing tools when pulling out the sheet piles, but since the work of installing and removing these reinforcing tools was troublesome and time-consuming, The disadvantage is that the work time is long, and the installation work itself also takes a long time.

Furthermore, when laying water and sewer pipes in areas with narrow roads or roads with heavy traffic, work cannot be done during the day, and the lining plates must be repeatedly attached and detached each time the laying work is carried out. There were also problems in terms of loss of work time and safety.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for excavating a cable laying hole that can shorten the working time for cable laying work and allow the cable laying work to be carried out regardless of the daytime.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the method of excavating a laying hole according to the present invention involves driving sheet piles facing each other at a predetermined interval, and placing sheet piles at both ends of the lining board. After adjusting the attached support mechanism so that the clamping members formed on the support mechanism are spaced apart from the oppositely driven sheet piles, the clamping member is straddled over the top of the driven sheet piles, The lining plate is attached to the upper part of the driving sheet pile so that the earth pressure applied to the driving sheet pile is received by the lining plate, and then the space between the sheet piles is excavated with the lining plate attached.

(Function) In the present invention, a lining board is attached to the upper part of the sheet piles that are placed facing each other, the earth pressure applied to the sheet piles is received by this lining board, and the space between the sheet piles is excavated with the lining board attached. Form the laying hole. In this way, since the lining board supports the sheet pile and receives the earth pressure, there is no need to attach and detach the piles, struts, etc. to the sheet pile, which shortens the work time for the pile and simplifies the installation work. Furthermore, even when installing pipes on roads etc., the work can be done day and night.

(Example) Next, an example of the present invention will be described based on the accompanying drawings. Figure 1 is a cross-sectional view showing the lining board installed, Figure 2 is a cross-sectional view taken along the line shown in Figure 1, Figure 3 is a plan view of the lining board, and Figure 4 is a cross-sectional view taken along the line - in Figure 3. FIG. 2 is an explanatory diagram showing an excavation method.

First, the apparatus used in the excavation method of the present invention will be explained. As shown in FIG. 2, a lining board 4 of a predetermined width is laid on top of the continuous sheet piles 3. The lining board 4 includes a base plate 5 that covers the upper part of the sheet pile 3;
It consists of a support mechanism 6 provided on this base plate part 5 and supporting the upper part of the sheet pile 3.

The floor plate 7 on the upper surface of the base plate 5 is composed of, for example, a checker plate, and a plurality of girder members 8, 8, . is placed on the top of the sheet pile 3 so as to be perpendicular to the driving direction of the sheet pile row, and is adapted to support the overlay load.

The support structure 6 is installed at two locations near both ends of the lining plate 4, and although it is desirable to attach it at two or more locations, it may be attached at one location. This support mechanism 6 has mounting members 11 and 11 mounted in the center of the beam member 8.
a cylinder 9 fixed by a cylinder 9;
Rods 10, 10 are slidably provided on both sides of the
The rod 10 expands and contracts with the pressure of fluid such as liquid or gas, adjusts the positions of arms 12, 12, which will be described later, and fixes them at a fixed position. Note that the support mechanism 6 may be constructed of a screw or the like instead of the cylinder 9 and rod 10 mechanism.

At the tips of the rods 10, 10 there are beam members 8, 8.
Arms 12, 12 arranged at both ends of the L are connected to each other, and this arm 12 is connected to the L
It slides guided by letter-shaped guides 13, 13.
The lower part of the arm 12 has an inner claw part 12a and an outer claw part 12b configured to straddle the upper end of the sheet pile 3, and the inner claw part 12a has a lining plate that is perpendicular to the girder 8 and has a lining plate. 4 is attached, and a clamp 15 is provided on the outer claw portion 12b. The clamp 15 is constituted by a fluid cylinder operated by fluid or gas, and cooperates with the upright 14 to clamp and fix the sheet pile 3. Note that the clamp 15 may be configured with a screw jack instead of the fluid cylinder.

Next, the excavation method of the present invention will be explained using the above-mentioned excavation device.

First, the road surface 1 is dug to a predetermined depth along the direction in which the installation pipe 16 is buried, a shallow trench 2 of a predetermined width is formed, and the sheet piles 3, 3 are placed facing each other with extra digging allowed on both sides of the trench 2. The concrete is poured until its upper part is at a predetermined position below the road surface 1.

Next, the cylinder 9 and rod 10 of the support mechanism 6 built into the lining board 4 are operated to adjust the position of the arm 12, and the arm 21 is set to the spacing between the sheet piles 3, 3 that are oppositely driven. do it like this. After that, the inner claw part 12a and the outer claw part 12b of the arm 12 are engaged so as to straddle the upper ends of the sheet piles 3, 3, and the lining board 4 is placed on the sheet piles 3, 3, and the lining board 4 is mounted on the outer claw part 12b. The lining board 4 is fixed onto the sheet piles 3, 3 by the support mechanism 6 by activating the clamp 15 and clamping the upper parts of the sheet piles 3, 3 between the clamp 15 and the upright 14.

By sandwiching the upper part of the sheet piles 3, 3 with the support mechanism 6 in this way, the lining board 4 is fixed to the sheet piles 3, 3, and the sheet piles 3, 3 can also stand on their own against the earth pressure. It can be done.

After that, an exit for the excavated soil (not shown) is secured, and as shown in Fig. 4, with the lining board 4 still attached to the sheet piles 3, 3, the earth is deposited at the planned height starting from the part closest to the exit. Perform 17 excavations.

At this time, the earth pressure applied to the sheet piles 3, 3 is received by the arm 12 of the support mechanism 6 as described above, and the pressure is transmitted to the girder 8 via the support mechanism 6, thereby preventing the sheet piles 3 from collapsing. This excavation forms the installation hole 18, and the installation pipe 16 is installed at a predetermined location.

When this laying is completed, the lining board 4 is left on the sheet pile 3 or removed, earth and sand is carried into the laying hole 18 to fill it, and the sheet pile 3 is pulled out to complete the laying.

(Effects of the Invention) As described above, according to the method of the present invention, a lining plate is firmly attached to the top of the piled sheet pile, and this lining plate absorbs the earth pressure from the sheet pile to prevent the installation hole from being closed. Since excavation work can be performed, there is no need to erect struts or erecting beams, reducing the time required for installation work.

In addition, with the present invention, it is possible to excavate between the sheet piles with the lining board attached, so even when laying pipes under the road, road traffic is ensured even during excavation work, and the lining board You can also do other work on top of it, which saves work space. In addition, there is no need to attach and detach the lining plate every time excavation or piping installation work is performed, improving work efficiency. Furthermore, even when the piping is not covered with earth, there are no struts, so it does not get in the way of excavation or piping work.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a sectional view of the lining board installed, Fig. 2 is a sectional view taken along the line shown in Fig. 1, and Fig. 3 is a plan view of the lining board. Fourth
This figure is a sectional view taken along the line -- in FIG. 3, and is an explanatory view showing the excavation method, and FIGS. 5 and 6 are sectional views of a conventional example in which a lining board is installed. 1... Road surface, 3... Sheet pile, 4... Lining board, 5...
...Substrate part, 6...Support mechanism, 18...Claying hole.

Claims (1)

[Claims] 1. Place the sheet piles facing each other at a predetermined interval, adjust the support mechanisms attached to both ends of the lining board,
After the clamping member formed on the support mechanism is set to have the spacing between the opposing driven sheet piles, the clamping member is straddled over the upper part of the driven sheet pile, and is clamped to the upper part of the driven sheet pile. A method for excavating a laying hole, characterized in that the lining plate is installed so as to absorb the earth pressure applied to the driving sheet pile, and then excavation is performed between the sheet piles with the lining plate attached.