JPH0454767B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to earth retaining work in which earth and sand remaining on the back side of the flange of a parent pile driven into the ground is mechanically excavated when constructing an earth retaining wall. It concerns drilling equipment.

<Conventional technology> Generally speaking, the parent pile horizontal arrow 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, and horizontal piles made of wood or other material are inserted between the parent piles in parallel with excavation to retain the earth. Problems to be Solved by the Present Invention> The above-described earth retaining wall construction technology has the following problems.

(b) Most of the earth and sand can be excavated mechanically using a excavator, such as a excavator.

However, the soil remaining in the parent pile must be removed by a worker by digging with a scoop or the like, which requires a great deal of labor.

(b) The soil remaining on the back side of the flange of the parent pile is excavated by workers using a scoop, making it difficult to cleanly remove the soil to the corners.

If the soil remaining on the back side of the flange is not sufficiently removed, it will take extra time to insert the horizontal sheet piles.

(c) 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.

(d) Excavation of the earth and sand remaining within the flanges of the parent piles will be carried out after the mechanical excavation by excavators such as box hoes is completed.

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.

<Effects of the present invention> The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to provide an excavation device for earth retaining works that can excavate safely and efficiently and reduce the cost required for excavation work. purpose.

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

<A> Configuration of excavation equipment (Fig. 1) The excavation equipment 1 consists of a main body 2 that engages with the flange A of the parent pile, and an excavation means consisting of a rotary blade 3 equipped with a driving means, and this equipment can be used as a backhoe 7 or the like. It has a structure in which earth and sand remaining on the back side of the flange A is excavated by attaching it to the tip of the boom 71 and moving it up and down.

<B> Excavation means (FIGS. 1 and 2) [Main body] The main body 2 is formed by foldably connecting end plates 21 with a hinge structure to both ends.

A jack 23 is connected between each end plate 21 and the main body 2.

By expanding and contracting each jack 23, a single plate can be formed, or both or one of the plates 21 can be retracted to the rear side.

[Rotary Blade] Two rods 31 are rotatably passed through each end plate 21 via the surface width L of the flange A and are pivotally supported.

A rotary blade 3 is fixed to the tip of each rod 31.

Further, a motor 5 is disposed at the base end of each rotary blade 3, so that a rotational force can be applied to the rotary blade 3.

The excavation diameter of each rotary blade 3 is such that it does not come into contact with the rib B of the parent pile.

The rotary blade 3 can be of a known type, such as one with an uneven digging blade on the outer periphery of a disc, or one with independent plate-shaped digging blades attached radially.

In short, any shape is sufficient as long as the back side of the flange A can be excavated to a sufficient extent to insert the horizontal sheet pile 6.

[Pressure sensor] Boom 7 that supports drilling equipment 1 as described later
1 may press the main body 2 against the flange A too much.

Therefore, the main body 2 that is scheduled to face the flange A
It is also conceivable to attach a pressure-sensitive sensor to one side.

That is, the configuration is such that the pressing force of the boom 71 against the flange A can be released when the pressure sensor detects a pressure equal to or higher than the set pressure.

As in this embodiment, the support shaft 4 that supports the running wheels 4
Although it is possible to provide a pressure sensitive sensor on the proximal end side of 1, it is also possible to provide each pressure sensor independently.

<C> Lifting means A boom 7 such as a backhoe 7 is installed on the back of the main body 2.
A connecting means connectable to the free end of 1 is provided.

This connection means can be achieved by any known connection method, such as a method of penetrating a pin between the bracket 24 provided on the back side of the main body 2 and the free end of the boom 71, or a method of connecting through a dedicated attachment. Can be adopted.

Furthermore, the present invention is advantageous in that the excavating apparatus 1 is moved along the flange A and moved up and down on the same perpendicular line, so that the excavating apparatus 1 with the boom 71 connected to its free end can be moved up and down using various known link mechanisms. be able to use working machinery.

Next, the excavation method will be explained. (Fig. 3) <1> Excavation with a backhoe Excavate with a backhoe 7, etc., as close as possible to the front of the flange A of the parent pile driven into the ground.

Even after the excavation by the backhoe 7 is completed, a large amount of earth and sand remains on the back side of the flange A.

<2> Connecting the excavating rig Next, the excavating rig 1 having the above structure is connected to the free end of the boom 71 such as the bomb hoe 7.

The excavation rig 1 can be replaced with a bucket of a bucket hoe 7 used for excavation, or a boom 71 of a special machine for the excavation rig 1 can be attached.

<3> Excavation of earth and sand on the back side of the flange At the same time as the motor 5 is driven, the boom 71 is lowered parallel to the flange A, and excavation by the excavation device 1 is started.

The rotational force of the motor 5 is transmitted to each rotary blade 3 to excavate the earth and sand remaining on the back side of the flange A.

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

As a result, the earth and sand remaining on the back side of the flange A are excavated into a groove shape with a constant cutting width by the two rotary blades 3.

Further, depending on the case, one end plate 21 may be folded and only one side of the flange A may be excavated.

<4> Installation of horizontal sheet piles After completing the excavation on the back side of flange A of each adjacent parent pile, place horizontal sheet piles 6 on the excavated flange A.
Insert into the groove on the back side of the wall to form a retaining wall.

The work of inserting the horizontal sheet piles 6 is performed immediately after the excavation for the insertion width of at least one horizontal sheet pile 6 is completed.

As described above, the flange A of the adjacent main pile
Earth retaining work is performed by covering the entire area of the exposed ground by inserting horizontal sheet piles 6 in between.

<5> Removal of the excavation rig When the excavation rig 1 reaches the bottom, the jack 23 is retracted and the end plate 21 of the main body 2 is folded, and then the excavation rig 1 is removed while avoiding collision between the rotary blade 3 and the flange A. pull it away from the main stake.

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

(b) It is now possible to mechanically excavate the earth and sand remaining on the back side of the flange of the parent pile, which previously relied on manual labor.

Therefore, the excavation efficiency was significantly improved compared to manual digging.

(b) Since excavation equipment can be attached to the free end of a boom such as a excavator, workers no longer have to manually dig at high places, significantly improving work safety.

(c) Just by selecting the rotary blade, excavation can be performed according to the thickness of the horizontal sheet pile.

In addition, there is no leftover excavation, and since the excavation can be done reliably up to the corners, the horizontal sheet piles can be inserted smoothly.

(d) Since the remaining earth and sand inside the parent pile can be excavated mechanically, it is no longer necessary to secure workers for excavation work or to carefully plan the process as in the past.

(e) Since the present invention excavates mechanically, the excavation efficiency of the earth and sand remaining on the back side of the flange can be adjusted in any way.

Therefore, the excavation work for the earth and sand remaining on the back side of the flange can be efficiently carried out without delaying the excavation work by the backhoe, and the construction period for the entire earth retaining work can be shortened.

[Brief explanation of drawings]

Figure 1: An explanatory diagram of an embodiment of the present invention, Figure 2:
Explanatory diagram showing the excavation function of the rotary blade of the excavation rig, Part 3
Figure: An explanatory diagram of earth retaining work.

Claims (1)

[Scope of Claims] 1. With the main body of the excavation equipment positioned in front of the flange of a parent pile with an H-shaped cross section driven into the ground, two rotating shafts are horizontally mounted with the flange sandwiched between the main body. A rotary excavation means configured by protruding in the direction and having a rotary blade located on the back side of the flange at the tip of a rotary shaft, and a connecting means connectable to the free end of a boom such as a backhoe. drilling rig.