JPH0454768B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> When constructing an earth retaining wall, the present invention is designed to remove soil and sand remaining on the back side of the flange surface of H-beams cast into the ground at predetermined intervals. This invention relates to an automatic excavator (hereinafter referred to as "excavator") used in earth retaining works that mechanically excavates the side wall surface connecting the back surfaces.

<Conventional technology> Generally speaking, the main pile horizontal sheet pile method exists as a simple construction technology for earth retaining walls.

In this construction method, parent piles made of H-beam steel or the like are driven into the ground at predetermined intervals in advance, and horizontal piles made of wood or the like are inserted between the parent piles to retain the earth in parallel with excavation.

<Problems to be Solved by the Present Invention> The above-described earth retaining wall construction technology has the following problems.

(b) In order to insert the horizontal sheet pile into the parent pile, it is necessary to excavate the excavation so that it is set back from the straight line connecting the front surfaces of the flanges of each parent pile.

This work requires the basket of a box hoe to be as close as possible to the main pile without colliding with it, and requires high operating skills from the operator of the box hoe.

(b) Earth and sand remaining on the back side of the flange cannot be excavated mechanically with a shovel, etc., so workers must excavate and remove it with a shovel, etc.

This work requires a lot of effort.

(c) Even when workers manually dig up the remaining soil on the back side of the flange with a shovel, it is extremely difficult to remove it all the way to the corners.

If the earth and sand are not removed sufficiently, it will take extra time to insert the horizontal sheet piles.

(d) When excavating soil remaining behind the flange at high places, a stepladder, etc. is used.

However, excavation work at high places is extremely dangerous and can even lead to loss of life.

(e) Excavation work for the remaining earth and sand on the back side of the flange will be carried out after waiting for the completion of functional excavation using excavators such as the excavator.

Therefore, when planning the entire work process, it is necessary to plan the number of people who will carry out manual digging so as not to lag too much behind the excavation speed of machine excavators such as excavators.

However, considering the high labor costs, it is uneconomical to secure extra personnel and it is difficult to plan the work process.

<Object of the present invention> The present invention was made in order to solve the above-mentioned problems, and it is possible to efficiently excavate the back side of the flange of each parent pile and the wall surface connecting the back sides of the flanges to a constant depth, and The purpose of the present invention is to provide an automatic excavator for earth retaining works that can perform these excavation operations safely.

<Example> Hereinafter, an excavator according to the present invention will be described with reference to the drawings.

<A> Configuration of the entire excavator (Fig. 1) The excavator 1 is composed of a belt-shaped excavator 2 having a large number of excavation blades on the outer periphery of an endless band, and a lifting means for vertically raising and lowering the belt-shaped excavator 2. do.

<B> Band-shaped excavation body The band-shaped excavation body 2 is an excavation tool that simultaneously excavates the side wall surface connecting the back side of the flange A of each parent pile and the back side of each flange A.

For example, as shown in FIGS. 1 and 2, the belt-shaped excavation body 2 has an endless belt with an excavation blade 2 on the outer periphery.
1 can be used.

A known steel chain or the like can be used as the endless band.

The excavation width of the excavation blade 21 is set to a size that allows excavation to be equal to or somewhat thicker than the thickness of one horizontal sheet pile inserted into the parent pile.

<C> Method of setting up the band-shaped excavation body The band-shaped excavation body 2 is configured so that rotational excavation can be performed following the change in the distance between the adjacent flanges A.

For example, there are sprockets 31 on both ends of the horizontal member 3,
32 is rotatably provided.

An elastic member 4 such as an elastic spring is arranged and attached in the vertical direction in the middle of the horizontal member 3.

A sprocket 41 is installed at the bottom end of this elastic material 4.
is provided rotatably.

Then, the band-shaped excavated body 2 is wrapped around each sprocket 31, 32, 41.

Furthermore, an adjustment spring 33 in a compressed state is interposed in the middle of the horizontal member 3 so that the expansion and contraction of the entire length of the horizontal member 3 can be adjusted.

That is, when both ends of the horizontal member 3 located on the inner circumferential side of the band-shaped excavation body 2 are compressed, or when this compressive force is released, the adjustment spring 33 expands and contracts to adjust the entire length of the horizontal member 3 to a predetermined length. It has a structure that can be adjusted.

Therefore, when the horizontal member 3 is elongated, for example,
The elastic material 4 expands and contracts, and conversely, when the horizontal material 3 contracts, the elastic material 4 expands, and so on, the elastic material 4 changes its total length in conjunction with the expansion and contraction movement of the horizontal material 3, and is constantly shaped like a strip. The excavation body 2 can be maintained in a tense state.

A motor 7 is disposed in the middle of the horizontal material 3 so as to apply rotational force to the band-shaped excavation body 2.

<d> Engagement means Engagement wheels 5 are rotatably provided near both ends of the horizontal member 3.

The engagement ring 5 is a member intended to be engaged with the edge of the flange A so that it can run.

The attachment position of the engagement ring 5 is such that when the engagement ring 5 engages with the edge of the flange A, the excavation blade 21 does not come into contact with the rib B of the parent pile.

In this embodiment, a case will be described in which only one engagement ring 5 is engaged with the flange A.
Of course, it is also possible to arrange two of them so that they are hugged at both edges of the flange A.

<E> Lifting means As a means for vertically raising and lowering the excavation equipment 1 engaged between adjacent parent piles, for example, a hanging wire 6 is connected to both ends of the horizontal member 3, and the upper end of this hanging wire 6 is used. It is conceivable to perform the wire winding operation on the side.

Another method is to lock the upper end of the hanging wire 6 to the upper part of the parent pile, and wind the wire with a wire winding device placed on the horizontal member 3 side to raise and lower the excavation equipment 1. It is also possible to do so.

Furthermore, it is also possible to provide a driving force to the engaging wheel 5 that engages with the flange A so that it can move up and down by itself.

Next, the excavation method will be explained.

<1> Excavation with a backhoe Excavate with a backhoe 8 etc. as close as possible to flange A of the parent pile driven into the ground.

In Backhoe 8, the back side of flange A,
Since it is not possible to excavate up to the wall surface connecting the back sides of this flange A, earth and sand remain.

<2> Setting the excavator Next, the excavator 1 having the above structure is set on the upper end of the parent pile A protruding from the ground.

To set up the excavator 1, simply suspend the excavator 1 with the suspension wire 6, and attach the engagement ring 5 to the flange A.
The work is as simple as engaging the edge of the flange A, positioning the band-shaped excavation body 2 on the back side of the flange A, and dropping it in, and it requires almost no effort.

<3> Start of excavation The motor 7 is activated and the excavator 1 starts excavating.

The rotational force of the motor 7 is transmitted to the belt-shaped excavation body 2 to excavate the earth and sand remaining on the back side of the flange A and the earth and sand on the wall surface remaining outside of a plane connecting the back sides of both flanges A with a straight line.

The excavated earth and sand will fall naturally and be removed.

The excavator 1 is lowered while operating the hanging wire 6 to perform continuous excavation.

When lowering the excavator 1, even if the distance between the edges of the flange A changes, the horizontal member 3 expands and contracts in response to the change, so the engagement ring 5 comes off the edge of the flange A. There is no need to worry and you can perform stable excavation work.

<4> Installation of horizontal sheet piles Immediately after completing the excavation of the earth and sand remaining on the back sides of both adjacent flanges A and between the back sides of both flanges A, install horizontal sheet piles 9 on the flange A that has already been excavated.
Insert it into the back side of the wall to form a retaining wall.

The insertion work of the horizontal sheet piles 9 is performed immediately after the excavation for the insertion width of at least one horizontal sheet pile 9 is completed.

As described above, the earth retaining work is performed by inserting the horizontal sheet piles 9 between the flanges A of adjacent parent piles, covering the entire area of the exposed ground.

<5> Removal of the excavator After the excavator 1 is lowered to the lowest point, the horizontal member 2 is forcibly contracted and the excavator 1 is removed.

<Effects> Since the present invention is as explained above, the following effects can be obtained.

(b) Excavation of the remaining soil on the back side of flanges, which conventionally relied on manual labor, and excavation between the walls connecting the back sides of adjacent flanges can be done mechanically without manual labor.

Therefore, the excavation effect is significantly improved and the overall construction period can be significantly shortened.

(b) Just by setting the excavator at the top of the parent pile, the excavator can descend while automatically digging, which significantly improves work safety.

(c) Just by selecting the belt-shaped excavation body, excavation can be performed according to the thickness of the horizontal sheet pile.

Furthermore, there is no excavation left behind, and the back corner of the flange can be reliably excavated, allowing for smooth insertion of horizontal sheet piles.

(d) Since the earth and sand remaining on the back side of the flange and between the back sides of the flange can be mechanically excavated, it is no longer necessary to secure workers for excavation work or to carefully plan the process as in the past.

[Brief explanation of the drawing]

Figure 1: Explanatory diagram of earth retaining work using an excavator, Figure 2
Figure: An explanatory diagram of one embodiment of the excavating device, FIG. 3: A partial explanatory diagram of the excavating machine. 1: Excavator, 2: Band-shaped excavation body, 31, 32, 4
1: Sprocket.

Claims (1)

[Scope of Claims] 1. A band-shaped excavation body in which a large number of excavation blades are formed on the outer periphery of an endless band, and a member that supports the band-shaped excavation body by applying a constant tension to the band-shaped excavation body on the inner peripheral surface of the band-shaped excavation body. , comprising a frame having an engaging ring that engages with the flange of a parent pile having an H-shaped cross section so as to be able to travel in the vertical direction, and is configured to be able to move up and down along the parent pile driven into the ground. Automatic excavator for earth retaining work.