JPH0454769B2 - - 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 excavation device for 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-shaped steel etc. are driven into the ground at predetermined intervals in advance, and horizontal piles made of wood or other material are inserted between the parent piles in parallel with excavation to construct an earth retaining wall. .

<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 piles into the main piles, it is necessary to dig back from the plane connecting the front surfaces of the flanges of each main pile.

This work requires excavating as close as possible to the parent pile without colliding with a basket hoe, etc., and requires high operating skills from the operator of the bucket hoe.

(b) Earth and sand remaining on the back side of the flange cannot be excavated with excavators such as a box hoe, so workers must excavate and remove it with a shovel.

However, excavating with a scoop requires a lot of labor and time, and is therefore inefficient.

(c) Even when workers manually dig the soil remaining on the back side of the flange with a scoop, etc., it is extremely difficult to excavate cleanly to the corners of the flange, and excavation remains often remain.

If excavated earth and sand remains, it will take 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 work, with people sometimes losing their lives due to falling accidents.

(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 mechanical excavation using excavators such as box hoes.

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 problems, and it is possible to efficiently excavate the back side of the flange of each parent pile and the side wall surface connecting the back sides of the flanges to a constant depth, Another object of the present invention is to provide an excavation device for earth retaining works that can safely perform these excavation operations.

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

<B> Overall construction of excavation equipment (Fig. 1) The excavation equipment 1 includes a belt-shaped excavation body 2 having a large number of excavation blades on the outer periphery of an endless belt, and a belt-shaped excavation body 2 that is stretched over an arm such as a backhoe. It consists of a frame 3 connected to the tip.

<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.

As the band-shaped excavation body 2, for example, as shown in FIGS. 2 and 3, an endless band with a large number of excavation blades 21 planted around the outer periphery 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> Frame The frame 3 is located on the inner circumferential side of the band-shaped excavated body 2, and the flange A where the band-shaped excavated body 2 is adjacent to each other.
It is formed with a telescoping function that enables rotary excavation to follow changes in the distance between the two.

For example, sprockets 31 and 32 are rotatably provided at both ends of the frame 3.

In the middle of frame 3 installed horizontally,
An elastic member 4 such as an elastic spring is arranged and attached in the vertical direction.

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 frame 3 so that the entire length of the frame 3 can be adjusted.

By providing the adjustment spring 33, when the driving interval of the parent piles changes, the overall length of the frame 3 changes and can reliably follow the change.

Furthermore, by providing the elastic material 4, the elastic material 4 expands and contracts when the frame 3 is expanded, and conversely, when the frame 3 contracts, the elastic material 4 expands.
Since the elastic material 4 changes its entire length in conjunction with the expansion and contraction movement of the belt-shaped excavated body 2, a certain tension can be applied to the band-shaped excavation body 2.

A motor 7 is disposed in the middle of the frame 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 frame 3.

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

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 The excavation device 1 is equipped with an arm 81 such as a backhoe
Use by connecting to.

To connect the drilling equipment 1 to the arm 81, for example, a hanging bracket 3 is attached on the frame 3.
4 is installed protrudingly.

This bracket 34 and the tip of the arm 81 are pivotally supported by a pin or the like so that they can be attached and detached.

Further, when connecting with the arm 81, it is also possible to configure the excavation device 1 so that its levelness and the turning angle in the horizontal direction can be adjusted.

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 side wall surface connecting the back sides of this flange A, the earth and sand remains as it is.

<2> Setting up the excavation rig The excavation rig 1 having the above structure is connected to the tip of the arm 81 of the backhoe 8.

The backhoe 8 that sets the drilling rig 1 is
It may be connected to a different excavator 8 than the one used for excavation work, and in some cases, it can be used in exchange for the bucket of the excavator 8 used for excavation work.

After connecting the excavation device 1 to the tip of the arm 81, move the arm 81 to remove the excavation device 1.
Position it directly above the parent pile where the side wall surface will be excavated.

<3> Start of excavation While rotating the band-shaped excavation body 2 of the excavation device 1, the excavation device 1 is gradually lowered.

At this time, the engagement ring 5 of the excavation device 1 is engaged with the flange A of the parent pile.

As a result, the rotating belt-shaped excavation body 2 excavates the earth and sand remaining on the back side of the flange A and the side wall surface receding from the plane connecting the back sides of both flanges A with a straight line.

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

When lowering the excavation rig 1, even if the distance between the edges of the flanges A changes, the frame 3 expands and contracts in response to the change.
There is no fear that the engagement ring 5 will come off the edge of the flange A, and stable excavation work can be performed.

<4> Installation of horizontal sheet piles Immediately after completing the excavation by the excavation device 1, the horizontal sheet piles 9 are inserted into the back side of the excavated flange A 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 excavation rig When the excavation rig 1 is lowered to the lowest point, the frame 3 is forcibly contracted, removed from the parent pile, and moved to the next place between the parent piles scheduled for excavation.

By repeating the above operations, retaining walls are successively constructed on the ground immediately after excavation.

<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 construction period required for constructing the retaining wall can be significantly shortened.

(b) Excavating equipment can be attached to the tip of the arm of a batshoe, etc. for excavation.

Therefore, even in high places, excavation can be done mechanically without relying on human resources, 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.

(E) The excavation equipment has a structure that allows it to be connected to the end of the arm of various types of construction machinery, such as a backhoe, with pins, etc., so it is easy to attach and detach.

(F) The excavation equipment can be used by connecting it to the arm of various construction machines other than Batsukuho, and has a wide range of versatility.

[Brief explanation of the drawing]

Fig. 1: An explanatory diagram of earth retaining work using an excavating device, Fig. 2: An explanatory diagram of an embodiment of the excavating device, and Fig. 3: An explanatory diagram of the state of excavation around the main pile. 1: Excavation equipment, 2: Strip excavation body, 3: Frame, 4: Expandable material, 5: Engagement ring, 8: Backhoe,
31, 32, 41: 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 circumferential side of the band-shaped excavation body. , a connecting means with an arm such as a backhoe, and a frame having an engaging ring that engages with the flange of a main pile with an H-shaped cross section so as to be able to run in the vertical direction. An excavation device for earth retaining works, characterized by being configured to be able to be raised and lowered freely.