JPH1181299A - Subsoil improving machine and subsoil improving method using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform improvement extending over the wide range of subsoil. SOLUTION: This subsoil improving machine is provided with a guide frame installed in a jobfield, a guide post elevatably moving leader 9 movable in the horizontal direction to the guide frame, a guide post 10 elevatably supported with the leader 9, and a main chain member 19 windingly provided on the outer circumference of the guide post 10 capably of endlessly rotationally moving and projectingly provided with drilling blades 18 on the outer face. It is further provided with a chain member 26 for enlarged drilling windingly provided extending over the required range in the vertical direction on both sides of the lower part of the guide post 10 capably of endlessly rotationally moving and projectingly provided with drilling blades 25 on the outer face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottom improvement machine for improving a ground at a predetermined depth over a wide range and a bottom improvement method using the same.

[0002]

2. Description of the Related Art Conventionally, a bottom improvement method for improving a predetermined depth position of a ground (referred to as a bottom) over a wide range to obtain a strong bottom has been widely performed.

[0003] In the above-mentioned conventional bottom improvement work, a drilling rod provided with stirring and mixing means such as a stirring blade or a high-pressure injection nozzle at the tip is inserted into the ground, the ground at a predetermined depth is improved, and then the drilling rod is pulled out. Next, it was common to use a construction method in which the drilling rod was moved to the next place, inserted into the ground again, and the floor was improved repeatedly.

[0004]

However, in the above-mentioned conventional method, since the range of the bottom which can be improved by one insertion of the drilling rod is narrow, it is necessary to pull out and insert the drilling rod in order to improve the wide bottom. It has to be repeated many times, and as a result, there is a problem that the working efficiency is extremely low.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the number of times of insertion and withdrawal of a drilling rod and the like so that a bottom plate can be improved over a wide area with high efficiency. A guide post elevating leader that is established and movable in the horizontal direction, a guide post that is supported by the leader so as to be able to move up and down, and an excavation blade protrudes from the outer surface so as to be endlessly rotatable around the outer periphery of the guide post. And a main chain member provided on the lower end of the guide post. Using the bottom improvement machine and the bottom improvement machine, the guide post is vertically excavated to position the enlarged excavation chain member at a predetermined depth of the ground, and then the guide post is moved in the horizontal direction. Then, the ground is dug laterally by the main chain member and the enlarged drilling chain member, and the ground improvement chemical liquid is supplied to the excavated earth and sand, and the mixture is agitated and mixed. It is an object of the present invention to provide a bottom plate improving method characterized by successively improving a bottom plate at a predetermined depth in a lateral direction by repeating forward and reverse rotations of a chain member and an enlarged drilling chain member.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows a front view of an embodiment of a bottom plate improving machine according to the present invention, and FIG. 2 shows the same side surface. In these figures, reference numeral 1 denotes a guide frame, and a base machine 3 having left and right crawlers 2 and 2. The lower end is vertically supported parallel to one side (one side in the traveling direction of the crawler) of a mount 4 supporting the crawlers 2 and 2, and the upper part of the guide frame 1 and the other side of the base machine 3 Are connected by a stay 5 for reinforcement.

The guide frame 1 is formed of a plurality of vertical columns 6, 6,... And upper and lower beams 7, 7, in a horizontally elongated rectangular shape as viewed from the front, and rails 8, 8 are provided at upper and lower portions on the outer surface side. A guide post elevating leader 9 (hereinafter simply referred to as a leader) can be traversed in the horizontal direction on the rails 8 and 8 via a sliding member (not shown) such as an oil-impregnated metal. Supported.

On the outer surface of the reader 9, guide portions 9a,
9a, a drive portion 11 above the guide post 10 is supported by the guide portion via slide members 12 and 12 so as to be vertically movable, and the drive portion 11 and the reader 9 are operated by remote control. The guide post 10 is locked at that position when the hydraulic cylinder 13 reaches the stroke end as usual, and the hydraulic cylinder 13
Is shortened, and the guide post 10 is sequentially pushed in by the tapeworm movement so as to be connected to the guide post 10 again at that position.

A traversing cylinder 14 for moving the leader 9 is fixed horizontally in the upper and lower portions of the leader 9, and the piston rod of the cylinder 14 is expanded and contracted to adjust the engagement position of the tip. In other words, the leader 9 is made to traverse by a shading insect movement. Regarding the traversing of the reader 9, regardless of the traversing cylinder 14,
Alternatively, the base machine 3 may be run.

The drive section 11 is provided with a drive sprocket 16 driven by a motor 15, and a driven sprocket 17 is pivotally supported at a lower end of the guide post 10. An outer space is provided between the sprockets 16 and 17. A main chain member 19 on which the excavating blades 18, 18,... Are fixed is wound around the side surface, and is endlessly rotatable along the outer periphery of the guide post 10.

On the front and rear side surfaces of the guide post 10 extending from the lower end to the upper side in a required range, support frames 20, 20 having a vertically long box shape are fixedly mounted.
The driven sprocket 1 of the guide post 10 is
7, a sprocket 22, 22 is fixed on a driven shaft 21, and guide wheels 23, 23 are rotatably mounted on the upper ends of the support frames 20, 20 by a shaft 24. The sprockets 22, 22 and the guide wheel 23 , 23 are wound with an enlarged digging chain member 26 having digging blades 25, 25,... Fixed on the outer surface, and are rotated in the same direction following the rotation of the main chain member 19. Is formed. Therefore, the lower end of the guide post 10 has a width approximately three times the width of the excavating blade 18 of the main chain member 19.

The positions of the shafts 24 of the guide wheels 23, 23 in the vertical direction can be adjusted by a chain tensioner 27, and the tension of the chain members 26, 26 for enlarged excavation can be adjusted.

A chemical passage (not shown) for supplying a ground improvement chemical such as cement milk is provided in the guide post 10 as usual, and the chemical passages branched into the support frames 20 and 20 are provided. 28 (shown in FIG. 3) are support frames 20, 2
Chemical discharge port 29 opened on the downward inclined surface of the lower end of zero
, And can discharge the chemical liquid into the ground at any time.

FIG. 5 shows the main chain member 19 and the enlarged drilling chain member 26,
26 shows an example in which the direction of rotation is opposite to that of the boss portion of the sprocket 17 at the lower end of the guide post 10 and the sprockets 22, 22 at the lower end of the support frames 20, 20.
Bevel gears 30 and 31 are fixed to the boss portions of the shafts, respectively, and an intermediate bevel gear 32 is meshed with these bevel gears 30 and 31 so that the enlarged drilling chain members 26 and 26 rotate in the opposite direction with respect to the main chain member 19. Has become.

Next, the operation of the above embodiment will be described.

The base machine 3 is moved to the construction site, and the main chain member 19 at the lower end of the guide post 10 and the digging blades 18 and 25 of the enlarged digging chain members 26 and 26 are grounded. Next, the motor 15 of the drive unit 11 is driven to rotate the sprocket 16 to rotate the main chain member 19 and the enlarged excavation chain members 26, 26, while operating the drive unit elevation hydraulic cylinder 13 to guide the guide post. 10
Press in order. When the excavation progresses to a predetermined depth by the shading insect movement by the hydraulic cylinder 13 in this way, the traversing cylinders 14 and 14 are extended in this state to move the leader 9 horizontally, or the base machine 3 is run to move the leader 9 horizontally. Move.

As a result, the ground is narrowed by the excavating blade 18 of the main chain member 19 as shown in the cross section of FIG.
And a wide portion b in which the excavating blades 25 are cooperatively excavated. During the excavation, the chemical solution discharge port 29
The chemical liquid such as cement milk spouted from the pit is stirred and mixed with the excavated earth and sand in the area excavated by the excavating blade 25 of the enlarged excavating chain members 26, 26, and the bottom is improved. in this case,
It is preferable to repeat the forward and reverse rotation of the main chain member 19 during the excavation and stirring because the stirring and mixing can be improved. In addition, as shown in FIG. 5, when the enlarged excavation chain members 26, 26 are rotated in the reverse direction with respect to the rotation direction of the main chain member 19, the stirring and mixing during excavation can be performed more favorably.

After the improvement of the bottom plate over a predetermined range is completed, the guide post 10 is pulled up and removed by performing the reverse operation of the pushing operation of the hydraulic cylinder 13.

[0019]

As described above, according to the present invention, it is not necessary to repeatedly insert and withdraw a drilling rod or the like as in the prior art, so that the bottom plate can be improved with high efficiency. In addition, when the chemical solution and the excavated earth and sand are mixed and stirred, the mixing can be performed within the enlarged excavated region, so that the useless region is not improved, and the bottom plate can be efficiently improved.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a bottom board improving machine according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an enlarged front view showing a lower end portion of the guide post in FIGS. 1 and 2;

FIG. 4 is a side view of the same.

FIG. 5 is a partial cross-sectional view showing an example of a reversing mechanism of the chain member for enlarged excavation in FIGS. 1 and 2;

FIG. 6 is an explanatory diagram showing a shape of a ground excavation trace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide frame 2 Crawler 3 Base machine 8 Rail 9 Leader for raising / lowering guide post 10 Guide post 11 Drive part 13 Hydraulic cylinder for raising / lowering drive part 14 Cylinder for traversing 18, 25 Drilling blade 19 Main chain member 20 Support frame 26 Enlarged drilling chain Member 27 Chain tensioner 29 Discharge port of chemical solution

Claims (2)

[Claims] 1. A guide post elevating and lowering leader which is established at a work site, is movable in a horizontal direction, a guide post which is supported by the reader so as to be able to ascend and descend, and is endlessly rotatable around the outer periphery of the guide post. And a main chain member having a cutting edge protruding on the outer surface, and an endlessly rotatable winding endlessly rotatable over a required range in the vertical direction on both lower sides of the guide post. A bottom plate improving machine comprising a chain member. 2. A main chain member wound endlessly and rotatably around an outer periphery of a guide post and having a cutting edge protruding from an outer surface thereof;
The guide post is excavated in the vertical direction by using a bottom improvement machine having an enlarged excavation chain member wound endlessly rotatable over a predetermined range on both lower sides of the guide post and having an excavation blade protruding on the outer surface. Then, the enlarged drilling chain member is positioned at a predetermined depth in the ground, and then the guide post is moved laterally to dig the ground laterally with the main chain member and the enlarged drilling chain member, and to excavate soil. The ground improvement chemical solution is supplied and mixed by stirring, the lateral movement is stopped in the middle of the above operation, and the forward and reverse rotations of the main chain member and the enlarged drilling chain member are repeated to laterally move the bottom at a predetermined depth. A bottom plate improvement method characterized by successive improvements.