JPH11172688A - Excavator for caisson - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excavator for a caisson capable of efficiently excavating the ground right under the cutting edge of a caisson. SOLUTION: The excavator for the caisson comprises a bar body 4 group installed to the end face of the cutting edge 2 of the caisson 1 at regular intervals and an excavator A1. The excavator A1 has a substrate 5 with a plurality of gears 16-19 for travelling while being engaged with the bar body 4 group, a plurality of bearing wheels mounted on the top face side of the substrate 5, rotary cutters 6, 7 rotatably arranged on the underside of the substrate 5 and a pair of screw bodies 8, 9 for removing earth disposed on the inside of the rotary cutters 6, 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caisson excavator for excavating a base plate directly at a cutting edge of various caissons.

[0002]

2. Description of the Related Art In general, sinking of a caisson is performed by using a heavy excavating machine such as a backhoe placed in the caisson or by using a clamshell bucket placed on the ground side to excavate the inside excluding the cutting edge. Is going.

[0003]

Heretofore, an operator has dug by hand or a backhoe or the like to dig a machine near the blade of a caisson. At risk.

A caisson must be submerged while maintaining its verticality and horizontality. If the caisson is tilted during subsidence, not only will the subsidence be impossible, but it will take a great deal of cost and time to repair it.

Conventionally, in order to maintain the verticality and horizontality of the caisson, a water film or an insulating layer such as a sheet is interposed between the caisson and the ground to make the caisson's peripheral frictional resistance uniform, Measures have been taken to concentrate the load on places where the settlement is slow and other measures have been taken.This not only requires a large amount of cost for the auxiliary equipment for maintaining the vertical and horizontal caisson, but also requires sophisticated operations. Requires skill.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a caisson excavator capable of efficiently excavating a foundation plate directly at a cutting edge of a caisson.

[0007]

The invention according to claim 1 is
In a caisson excavator for excavating a groundwork directly under a caisson blade, a group of rods provided at predetermined intervals on an end face of the caisson blade and a plurality of excavators arranged at point-symmetric positions of the caisson at the caisson blade. The excavator is provided with a substrate having a plurality of traveling gears that travel while engaging with the rod group, and is provided to be supported on the upper surface of the substrate, and is in contact with an end face of a caisson blade. A plurality of bearing wheels, a rotating cutter that is rotatably arranged on the lower surface side of the substrate, and a rotating cutter that excavates the blade width of the caisson, and a rotatable arrangement that is rotatable inside the rotating cutter on the lower surface side of the substrate, A caisson excavator, comprising: a pair of unloading screw bodies that are carried out to a caisson. According to a second aspect of the present invention, in the caisson excavator according to the first aspect, the speed traveling of each of the excavators disposed at the point of symmetry of the caisson at the cutting edge of the caisson is set to be equal. Drilling rig. According to a third aspect of the present invention, in the caisson excavator according to the first aspect, the rotary cutters are disposed at both ends of the substrate, and a pair of earth discharging screw bodies are disposed between the rotary cutters. A caisson excavator, characterized by:

[0008]

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

<A> Caisson FIG. 2 is a plan view of the caisson 1 on the side of the blade 2, and FIG. The caisson 1 includes various known types (open type or bottomed type), and its cross-sectional shape includes a polygon, a circle, and an ellipse in addition to the illustrated rectangle. In the present invention, the end face of the blade port 2 of the caisson 1 is formed to have the same width as the frame thickness, and it is not necessary to form the end face sharply as in the conventional case.

A plurality of rods 4 are provided on the steel plate 3 covering the end face of the blade 2 at predetermined intervals. The rod 4 functions in the same manner as a linear gear for locking the traveling means of the excavators A1 to A4, which will be described later. On each side of the cutting edge 2, a plurality of sets of excavators A1 to A4 are provided for excavating the ground immediately below the cutting edge 2 on each side.

<B> Excavator Since the excavators A1 to A4 in FIG. 2 have the same structure, only the excavator A1 will be described, and the description of the other excavators A2 to A4 will be omitted.

As shown in FIG. 3 and FIG.
5, a plurality of sets of rotating cutters 6 and 7 rotatably provided on the lower surface of the substrate 5, and a rotatable cutter provided between (inside) the rotating cutters 6 and 7. , A pair of screw bodies 8 for discharging the soil into the caisson 1
9 and means for moving the substrate 5.

The base plate 5 is a rigid plate having a size slightly larger than the cross-sectional width of the cutting edge 2. A plurality of brackets 10 for rotatably supporting the rotary cutters 6, 7 and the screw bodies 8, 9 for discharging are provided on the lower surface thereof. , 11 are provided.

The reason why the width of the substrate 5 is made larger than the cross-sectional width of the blade 2 is that the rotary cutters 6 and 7
This is because space for mounting the drive source (motor) 9 and various power transmission mechanisms is considered. When the substrate 5 has a hollow structure and incorporates these driving sources (motors) and various power transmission mechanisms, the width of the substrate 5 can be designed to be substantially equal to the cross-sectional width of the blade 2.

<C> Rotary cutter The rotary cutters 6, 7 are arranged on the outermost side of the substrate 5 with their rotation axes directed in a direction perpendicular to the traveling direction of the substrate 5, and transmitted via a gear mechanism or a chain mechanism (not shown). By rotating by receiving the rotational force of the driving source (motor) to be excavated, a range approximately equal to the horizontal width of the substrate 5 can be excavated.

In this embodiment, a description will be given of a case where each of the rotary cutters 6 and 7 is provided with a plurality of bits 13 on a rotary drive shaft 12 as shown in FIG. 1, but the structure of the excavating means is limited to this embodiment. Instead, widely known excavation means can be applied.

<D> Discharge Screw Body The discharge screw bodies 8 and 9 are arranged with their rotating shafts oriented in a direction perpendicular to the running direction of the substrate 5, and the blades of each screw are formed in opposite directions. Have been. Drive source (motor) transmitted via gear mechanism or chain mechanism (not shown)
When the pair of earth discharging screw bodies 8 and 9 are rotated by receiving the rotation force, the earth shaving excavated by the rotary cutters 6 and 7 can be discharged to the inside of the cutting edge 2.

Since the excavator A1 reciprocates through the cutting edge 2,
Even if the moving direction changes, the rotation direction of the pair of discharging screw bodies 8 and 9 does not change.

<E> Traveling means FIG. 5 is a sectional view of the excavator A1 at the position of the rotary cutter 6.
FIG. 6 shows a plan view of the excavator A1. On the upper surface of the substrate 5,
A plurality of bearing wheels 14 that contact the end face of the blade port 2 and run idle are supported. The bearing wheel 14 only needs to be arranged at a position where it does not collide with the four rows of bars provided on the cutting edge 2 of the caisson 1.

As shown in FIG. 6, a plurality of traveling gears 16 and 17 engaging on both sides of four rows of rods are provided on the upper surface side of the substrate 5,
18 and 19 are arranged, and all the running gears 16 to 19 are synchronized to rotate forward and reverse by receiving the rotational force of the driving source placed on the substrate 5. Running gear 15 ~
A concave portion is formed at an interval equal to the pitch of the rod body 4 on the peripheral surface of the rod 18, and a reaction force is obtained from the rod body 4 by rotating the running gears 16 to 19 to apply a self-propelling force to the excavator A1. It can be given.

[0021]

Next, a method of excavating the caisson 1 under the cutting edge directly under the ground will be described.

<A> Setting of excavator As shown in FIG. 2, the above-described excavators A1 to A4 are set on each side of the cutting edge 2 of the caisson 1.

At this time, it is desirable that the excavators A1 to A4 are arranged at point symmetrical positions of the cutting edge 2 in order to uniformly excavate the entire base plate of the cutting edge 2.

<B> Start of excavation Excavators A1 to A4 are simultaneously operated to start excavation, and the opposing excavators A1, A3 and A2, A4 run at the same speed.

That is, as shown in FIGS. 1, 4 and 5, the rotary cutters 6 and 7 are rotationally driven to excavate the ground immediately below the cutting edge 2,
The excavated earth and sand is discharged to the inside of the cutting edge 2 by the discharging screws 8 and 9.

In parallel with this, each of the running gears 16 to 19 shown in FIG. When each of the excavators A1 to A4 has excavated to the end of each side of the blade 2 of the caisson 1, the self-propelled direction of each of the excavators A1 to A4 is switched, and the direct foundation of the blade 2 is excavated evenly again.

By repeating the above-mentioned operations, the base plate of the cutting edge 2 is excavated by an equal amount to lower the caisson 1.
Excavation of the inner soil excluding the cutting edge 2 of the caisson 1 employs various known excavation means.

<C> Burden load of the excavator It seems that the total weight of the caisson 1 is applied to the excavators A1 to A4. However, the total weight of the caisson 1 does not act on the excavators A1 to A4 for the following reasons. The burden load on A4 is small.

That is, when only one side of the cutting edge 2 of the caisson 1 is taken out and considered, before the excavator A1 starts excavating, the straight foundation plate of the cutting edge 2 having a large installation area bears most of the load. The load borne by the excavator A1 is extremely smaller than that of the direct foundation. When the excavator A1 reaches the center of one side of the cutting edge 2, the load imposed on the excavator A1 becomes the largest, but half of the load is still borne by the direct foundation. When the excavator A1 crosses the center of one side of the cutting edge 2, the starting point side of the excavator A1 sinks, and the burden on the direct foundation increases.

As described above, since the straight foundation always supports the weight of the caisson 1, the load imposed on the excavators A1 to A4 is reduced. Moreover, since the load is distributed to the plurality of excavators A1 to A4, the load imposed on each of the excavators A1 to A4 is further reduced.

[0031]

[Embodiment 2] In the first embodiment described above, a case has been described in which a plurality of excavators are reciprocated for excavation, but excavation is performed by driving a plurality of excavators in a fixed direction. Is also good. This example is suitable when the plane shape of the caisson is circular.

[0032]

Embodiment 3 It is also possible to make only an arbitrary excavator self-propelled and excavate a partial area. This example is useful for correcting the inclination of the caisson 1.

[0033]

Fourth Embodiment In the first embodiment, the case where the excavator is equipped with the rotary cutters 6 and 7 for excavating just below the substrate 5 is explained. Auxiliary excavation drums (not shown) for excavating earth and sand located in between may be added to both upper ends of the substrate 5 respectively.

[0034]

As described above, the present invention has the following effects. <B> Since the caisson can be directly excavated into the caisson blade, the operator does not need to enter the caisson, and the caisson can be lowered while ensuring the safety of the operator. <B> Conventionally, in order to sink the caisson just below the cutting edge without excavating it, ancillary equipment for maintaining verticality and horizontality was required. On the other hand, according to the present invention, the caisson sinks by directly excavating the caisson
Conventional auxiliary equipment can be omitted. <C> The structure is simple and it is hard to break down. <D> By providing the screw body for discharging soil inside the rotary cutter, excavated earth and sand can be mechanically discharged to the inside of the caisson.

[Brief description of the drawings]

FIG. 1 is a side view of a caisson excavator according to the present invention, with a part thereof broken away.

FIG. 2 is a plan view of the caisson blade side.

FIG. 3 is a perspective view of a caisson excavator set at the cutting edge.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a sectional view taken along line VV in FIG. 1;

FIG. 6 is a sectional view taken along line VI-VI in FIG.

[Explanation of symbols]

 A1 to A4 Excavator 1 Caisson 2 Caisson's blade 3 Steel plate 4 Rod 5 Substrate 6,7 Rotating cutter 8,9 Screw for earth removal 10,11 Bracket 12 Rotary drive shaft 13 Bit 14 Bearing wheel 16-19 For traveling gear

Claims (3)

[Claims] 1. A caisson excavator for excavating a ground directly under a caisson blade, comprising: a group of rods provided at predetermined intervals on an end surface of the caisson blade; A plurality of excavators arranged, wherein the excavator is provided with a plurality of traveling gears that travel while engaging with the rod group; A plurality of bearing rings abutting against the end surface of the caisson, a rotatable cutter disposed on the lower surface side of the substrate, and a rotatable cutter for excavating the blade width of the caisson, and a rotatably disposed inside the rotatable cutter on the lower surface side of the substrate,
An excavator for a caisson, comprising: a pair of screw bodies for discharging the soil into a caisson. 2. The excavator for caisson according to claim 1, wherein the speed running of each excavator arranged at the point of symmetry of the caisson is set to be equal to the cutting edge of the caisson. . 3. The caisson excavator according to claim 1, wherein a rotating cutter is arranged at both ends of the substrate, and a pair of earth discharging screw bodies is arranged between the rotating cutters. Drilling rig for caisson.