JPH09217345A - Rectangular earth retaining soil wall construction method and rectangular earth retaining soil wall excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a rectangular earth retaining soil wall easily by digging the ground by a rectangular earth retaining soil column row wall excavator on which a vibration plate is attached, scraping out earth which is not digged out by the vibration plate, and pouring stabilizer and solidifying it. SOLUTION: A vibration plate 8 which forms a vertical plate and vibrates in the vertical direction is provided at an intermediate position between two adjacent digging bits in plan at a position just close to a shaft interval hold member when viewed in the direction of elevation and a stirring blade. A material of the vibration plate 8 is steel, and it is made of steel in the groove shape having a flange 8a on both sides. It has a tapered shape when viewed in the direction of side and is arranged in parallel with both outside positions of a stirring digging shaft 1 at the same interval as diameter of tip circle of the digging bit and the stirring blade. While the ground is digged down to required depth by the digging stirring shaft 1, a part which is not digged is scraped out by the vibration plate 8, and stabilizer is poured into the soil, stirred, mixed, and solidified. Consequently, it is possible to construct a rectangular earth retaining soil wall easily irrespective of type of ground and constitution of ground layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mountain stopper temporarily installed when an underground structure is deeply excavated to construct an underground structure,
Especially a method of constructing a soil column wall with a rectangular horizontal section,
An excavator used to carry out the method.

[0002]

2. Description of the Related Art Conventionally, when ground is excavated to a required depth by vertical excavation and agitation shafts in which a plurality of excavation bits and agitation blades are arranged in parallel with each other so as to partially overlap each other in plan view, Stabilizer such as cement slurry is poured into the loosened in-situ soil from the tip of the excavation stirring shaft, stirred and mixed to solidify, and if necessary, a core material such as H steel is inserted into the in-situ soil. The method of constructing the piled-up soil pillar column wall to be integrated with each other has already been publicly known and well known. Further known is a method of constructing a soil column wall with a rectangular horizontal cross section and the excavator used to carry out the method.

For example, Japanese Utility Model Publication No. 48-32163 discloses an excavator such as a rectangular deep groove in which a vertically movable rectangular excavation frame is mounted on the outer circumference of a pair of rotary cutters. Japanese Utility Model Publication No. 6-12532, JP-A No. 7-3774,
In Japanese Utility Model Application Laid-Open No. 7-42808, each of the second excavation and agitation shafts located in the middle of two excavation and agitation shafts adjacent to a housing (coupling member) that holds the intervals between the plurality of excavation and agitation shafts and arranged in the orthogonal outward direction A rectangular excavated soil wall excavator having a configuration in which two cutters are provided and the second cutter is rotationally driven by using the rotation of an excavation stirring shaft is described.

In Japanese Patent Laid-Open No. 7-119140, a rotation converting portion is provided at a plurality of excavating and stirring shafts, particularly at an intermediate position between the excavating bit and the stirring blade, and a rectangular shape is provided at a position of an outer circle of the stirring blade and the excavating bit. There is described a rectangular pile stop soil wall excavator in which a plate-shaped second cutter is installed on both outer sides of an excavation stirring shaft in a direction perpendicular to the excavation bit and the uncut soil of an excavation bit is excavated by the second cutter.

Incidentally, the significance, necessity, and effectiveness of constructing a rectangular pile stop soil wall are explained as follows, in comparison with a soil column row wall in which a circular soil column partially overlaps and is continuous. That is, the soil pillars A of the soil pillar row wall are formed with the inter-axis pitch P (usually about 450 mm) of the excavation stirring shaft as shown in FIG. Therefore, the arrangement pitch of the core material (H-shaped steel) B is also limited to the same or an integral multiple of the inter-axis pitch P. As a result, because of the strength design of the mountain retaining wall, the pitch of the core material B is not an integral multiple of the inter-axis pitch P, but it is a little smaller, for example, when it is desired to increase the strength by arranging a large number at about 400 mm, or conversely. The arrangement pitch is not an integer multiple of the inter-axis pitch P, but is a little larger, for example, 500 mm, 6
Even if the amount of use can be reduced to about 00 mm or 700 mm, it has been extremely difficult in terms of construction to specifically realize such optimum design and economic design. In other words, the degree of freedom in design and construction was poor. Further, considering the interference between the outer diameter circle of the soil column A and the flange of the H-section steel as in the core material B ′ shown by the dotted line in FIG. 4, there is a strong restriction on the size of the core material (result, flange width). However, there is a limit to the displacement of the core material in the wall thickness direction. For example, the dimension E by which the H-section steel flange approaches the site boundary line D is never zero. Generally, the E dimension is usually constructed at a position closer to the inner side by 100 mm from the site boundary line D, and the effective floor area that can be constructed in the underground part of the building is narrowed accordingly.

As shown in FIG. 5, when the soil portion C left uncut in the middle of two adjacent excavation bits is shaved off, a rectangular pile stop soil wall is formed. In the case of a rectangular pile stop soil wall, as shown in FIG. 6, the core material B can be installed in a size equal to the diameter of the soil pillar A. The arrangement pitch P ₁ of the core material B can be designed and constructed to have an arbitrary desired size without being restricted by the size of the inter-axis pitch P of the excavation stirring shaft. In other words, the diameter of the soil column A is designed and constructed in the same manner as that of the core material B, and F in FIG.
The dimension is eliminated, and the wall thickness W is reduced to that much, so that the cement,
It is possible to easily reduce the material cost of bentonite and the like, and reduce the amount of drilling residual soil to save the industrial waste treatment cost. Further, since the flange of the core material B (H-shaped steel) is designed to be exactly aligned with the site boundary line D as shown in FIG. 6, the construction and construction can be easily performed, so that the constructionable effective floor area of the underground portion of the building is widened. .

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The excavator such as the rectangular deep groove described in Japanese Utility Model Publication No. 48-32163 excavates a groove for constructing a continuous underground wall in units of rectangular holes. , It has no purpose and function (use) of building a mountain stop soil pillar column wall. The rectangular soil excavator described in Japanese Utility Model Laid-Open No. 6-12532 and others has a function and a structure for the purpose of constructing a rectangular mountain stop soil wall. Therefore, although it is possible to enjoy the significance, necessity, and effectiveness of constructing the above-mentioned rectangular mountain stopper soil wall, it is possible to excavate with the second propeller-shaped cutter that is arranged orthogonally outward to the excavation stirring axis. However, there is a drawback that it is difficult to apply it to hard ground with high so-called N value (sand gravel layer, etc.). The rectangular earth retaining soil wall excavator disclosed in Japanese Patent Laid-Open No. 7-11914 also has a rectangular shape. It has the function and structure for the purpose of constructing the earth retaining soil wall. Therefore, it is possible to enjoy the significance, necessity, and effectiveness of constructing the above-described rectangular mountain stopper soil wall. However, the second cutters installed on both outer sides of the excavation and stirring shaft are specifically described in the left column of page 3 of the same publication on the 25th to 30th lines [in the section of the examples].
The rotation of a is transmitted to the cutter 35a, but when the movement of the cutter 35a is restrained due to the contact of the cutter 35a with an obstacle or the like, the rotation of the shaft 31a is prevented and the rotation of the shaft 31a is prevented from being transmitted to the cutter 35a. Therefore, even if the cutter 35a contacts the obstacle foreign matter, the gear mechanism in the casing 25a is prevented from being damaged. As described above, there is a limit to the soil quality that can be excavated by the second cutter, and there is a drawback that it is difficult to apply to hard ground with a high so-called N value. It is an object of the present invention to provide a method of constructing a rectangular earth retaining soil wall effective for hard ground having a high value, and a rectangular earth retaining soil wall excavator having a relatively simple structure, which is used for implementing the method.

[0008]

As a means for solving the above-mentioned problems, in the method for constructing a rectangular mountain stopper soil wall according to the invention of claim 1, the excavating bit and the stirring blade at the tip end are viewed in plan. The ground is excavated to the required depth by vertical excavation and agitation shafts arranged in parallel at intervals that partially overlap each other, and stabilizer is injected into the excavated in-situ soil from the tip of the agitation and agitation shaft to stir. In the method of constructing the earth retaining wall by inserting and integrating the core material into the soil in situ while mixing and solidifying, the lower position as close as possible to the drill bit and the stirring blade when viewed in the elevation direction, When viewed two-dimensionally, an oscillating plate that vibrates in the vertical direction is installed in the vertical direction at a position tangentially connecting the tip circles of the drill bit and the stirring blade at an intermediate position between the two adjacent drill bits and the stirring bit. Non-movable close to a stirring blade Minute vertical vibration generator is provided, and the ground is excavated to a required depth with a rectangular mountain stop soil wall excavator in which the vibration plate is attached to the tip of a vibration shaft extending vertically downward from the vibration generator. And, the unsoiled soil at the intermediate position between two adjacent excavation bits is scraped off by the vibrating plate, and the stabilizer is injected from the tip of the excavation stirring shaft into the in-situ soil excavated in a rectangular plane shape to stir and mix. And solidify, and the core material is inserted into the above-mentioned in-situ soil at a required pitch and at a required arrangement in the wall thickness direction to be integrated.

Further, in the rectangular earth retaining soil wall excavator according to the second aspect of the present invention, a plurality of vertical excavation stirring shafts arranged in parallel are provided at the tip end portions of the excavation bits and the stirring blades in a plan view. Ground stoppers that are provided at intervals to partially wrap, excavate the ground to the required depth with the excavation stirring shaft, inject a stabilizer into the excavated in-situ soil from the tip of the excavation stirring shaft, stir mix, and solidify In a soil wall excavator, the drill bit and the stirring blade are located at a lower position as close as possible to the drill bit and the stirring blade when viewed in the vertical direction, and at an intermediate position between two adjacent drill bits and the stirring blade when viewed two-dimensionally. A vibrating plate that is vertically flat and vibrates in a vertical direction by arranging the tip circles of the tongue in a tangential direction, and a vertical vibration generator is installed in an immovable part near the excavating bit and the stirring blade. Vertical from generator The vibrating plate is attached to the tip of the vibrating shaft extending in the direction, and the uncut soil at the intermediate position between two adjacent excavating bits is excavated to the required depth with the excavating bits of the excavating and stirring axes. Each of the above-mentioned vibration plates is characterized by excavating a scrape wall of a rectangular mountain stopper.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 to FIG.
An example of a rectangular pile stop soil wall excavator according to the invention is shown for a main part of an excavating stirring shaft. That is, in FIG. 1, the intervals at which the drill bit 2, the stirring blade 3, and the auger screw 4 partially overlap each other when viewed in plan at the tip of each vertical drilling and stirring shaft 1 arranged in parallel with each other ( (See FIG. 3). As an example, the excavation stirring shafts 1 and 1 have a pitch P of 450 mm, the excavation bits 2, the stirring blades 3 and the auger screw 4 each have an outer diameter of 600 mm, and the lapping amount is 150 mm. The excavation stirring shaft 1 has a hollow tube structure, and its hollow portion (or inner tube)
Through this, a stabilizer such as cement milk is supplied from an above-ground supply device. Although not shown in detail, so-called penetration discharge for injecting the stabilizer into the excavated earth and sand through the injection hole provided at the tip of the shaft, and pulling up through the injection hole provided immediately above the stirring blade It is constructed so that it can be discharged. That is, it is used for carrying out a method for constructing a soil retaining wall by excavating the ground to a required depth with the excavation and agitation shaft 1, injecting a stabilizer into the loosened in-situ soil, agitating and mixing to solidify. In FIG. 2, reference numeral 5 is a stabilizer, 6 is a bearing member, and 7 and 9 are axial spacing holding members provided at two upper and lower positions for stably holding the pitch between the lower portions of the excavation and stirring shaft 1.

As a feature of the present invention, when viewed in the vertical direction of FIG. 1, the position immediately below the shaft spacing member 9 which is as close as possible to the drill bit 2 and the stirring blade 3 is shown, and as shown in FIG. As seen, the two adjacent drilling bits 2, 2 and the stirring blades 3, 3 are arranged so that the tip circles of the drilling bit 2 and the stirring blade 3 are tangentially connected to each other at an intermediate position, and they form a vertical flat plate and vibrate in the vertical direction. A vibrating plate 8 is provided. As is clear from comparing FIG. 3 with FIG. 5, the vibrating plate 8 has a width L (L (L) required to scrape away all the soil portion C left uncut in the middle of two adjacent excavating bits 2 and 2. Is about 400 mm
2) and has a grooved steel shape having flanges 8a also serving as stiffeners on both sides, and the flanges 8a have a tapered shape which is sharply pointed when viewed in the side direction of FIG. As the material of the vibration plate 8, steel, cast steel, forged steel, or the like is preferably adopted. The size of the vibration plate 8 in the height direction need not be so large. A bearing 8b is provided at the center of the inside of the vibration plate 8 having a channel steel shape. The vibrating plates 8 are provided in parallel to both outer positions of the stirring excavation shaft 1 at an interval of 600 mm which is the same as the diameter of the tip circle of the excavation bit 2 and the stirring blade 3. On the other hand, a hydraulic vibration generator commonly referred to as a hydraulic breaker as a vibration generator that generates vertical vibration in the upper shaft spacing member 7, which is one of the non-movable parts near the excavation bit 2 and the stirring blade 3. 10 is installed, and the tip of a vibration shaft 11 extending vertically downward from the vibration generator 10 is firmly connected to the bearing 8b of the vibration plate 8. The vibrating shaft 11 is configured so that its vertical movement is guided by a guide member 12 provided on the lower spacing member 9.

Therefore, this rectangular pile stop soil wall excavator excavates the ground to the required depth with the excavation bits 2 of each of the three excavation stirring shafts 1 and the two adjacent excavation bits 2 and 2. The unearthed soil portion C at the intermediate position can be scraped off cleanly by the vertical vibration of each vibrating plate 8 driven by the hydraulic vibration generator 10 to excavate the rectangular earth retaining wall. In particular, the hydraulic vibration generator 10 generates a strong vertical vibration, and the vibrating plate 8 exerts a vertical excavation function by a simple vertical vibration. Therefore, the cutting capacity thereof is high, and a gravel layer having a high N value is used. Because it excavates easily on hard ground, it has a wide range of applicability without being affected by the hardness of the ground or the composition of the formation. Therefore, the type and drive source of the vibration generator are not limited to the hydraulic type, and pneumatic type or electromagnetic type can be widely adopted.

A method of constructing a rectangular earth retaining soil wall using the rectangular earth retaining soil wall excavator constructed as described above is carried out as follows. A rectangular pile stop soil wall excavator is installed at the construction position, the vertical excavation stirring shaft 1 is used to excavate the ground to the required depth, and a stabilizer is injected into the excavated in-situ soil from the tip of the excavation stirring shaft. The process of stirring and mixing to solidify and inserting the core material into the in-situ soil to integrate them is no different from the conventional method.

The feature of the soil wall construction method of the present invention is that, at the same time when the ground is excavated by the excavation bit 2, the vibrating plate 8 driven by the hydraulic vibration generator 10 is vibrated in the vertical direction, and two adjacent excavations are excavated. The soil portion C left unetched at the intermediate position between the bits 2 and 2 is finely cut by the vibrating plate 8 into a vertically cut shape, and rectangular excavation is performed. The stabilizer is injected into the in-situ soil excavated in this way from the tip of the excavation stirring shaft to stir and mix to solidify the core material B in the in-situ soil before solidification in the longitudinal direction of the wall. If it is necessary to deviate in the wall thickness direction at any desired arrangement pitch, insert it at the required eccentric position (see E and F dimensions in FIG. 4) and integrate it to determine the type of ground and the formation Regardless of the configuration, we will construct a rectangular mountain stop soil wall by constructing the optimal strength design and economic design as it is.

[0015]

According to the method for constructing a rectangular mountain stop soil wall and the rectangular mountain stop soil wall excavator according to the present invention,
Regardless of the type of ground, stratum composition, or whether there is an excavation obstacle in the ground, it is possible to easily construct a rectangular mountain stop soil wall in a wide application range, and it is an optimal design for the application. , The most economical design work can be done.

[Brief description of drawings]

FIG. 1 is a front view showing an excavation stirring shaft portion of a rectangular pile stopper soil wall excavator according to the present invention.

FIG. 2 is a side view showing an excavation stirring shaft portion of a rectangular pile stop soil wall excavator according to the present invention.

3 is a sectional view taken along the line 3-3 of FIG.

FIG. 4 is an explanatory diagram of a soil column wall.

FIG. 5 is a diagram showing how to excavate a rectangular pile retaining wall.

FIG. 6 is a diagram for explaining the advantages of a rectangular mountain stopper soil wall.

[Explanation of symbols]

 2 excavation bit 3 stirring blade 1 excavation stirring shaft B core material 8 vibrating plate 11 vibrating shaft 10 vibration generator

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshiaki Tsuchiya 8-21-1 Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Nobuyoshi Nishio 8-21 Ginza, Chuo-ku, Tokyo No. 1 Stock Company Takenaka Corporation Tokyo Main Store

Claims (2)

[Claims] 1. The ground is excavated to a required depth by vertical excavation and agitation shafts in which a plurality of tip excavation bits and agitation blades are arranged in parallel at intervals such that they partially overlap each other in plan view,
In the method for constructing the earth retaining soil wall, in which the stabilizer is injected into the excavated in-situ soil from the tip of the excavation stirring shaft to stir and mix to solidify, and the core material is inserted and integrated into the in-situ soil as described above. When viewed in the plane direction, the drill bit and the stirring blade are located at a lower position as close as possible, and when viewed two-dimensionally, they are located at an intermediate position between two adjacent drill bits and the stirring blade. A vibrating plate that vibrates in a vertical direction in a connecting arrangement is provided in a vertical direction, a vertical vibration generator is provided in an immovable portion near the drill bit and the stirring blade, and a vibration shaft extending vertically downward from the vibration generator. The ground is excavated to the required depth with a rectangular mountain stop soil column wall excavator with the vibrating plate attached to the tip, and the unearthed soil in the middle position between two adjacent excavating bits is scratched with the vibrating plate. In this way, injecting stabilizer from the tip of the excavation stirring shaft into the in-situ soil excavated in a rectangular shape in plan view, stirring and mixing to solidify, and the core material in the in-situ soil at the required pitch. In addition, the method for constructing a rectangular column-stop soil column row wall is characterized in that it is inserted and integrated in a required arrangement in the wall thickness direction. 2. A plurality of vertical excavation and agitation shafts arranged in parallel are provided at the tip of the excavation bit and agitation blades at intervals such that they partially overlap each other when viewed two-dimensionally, and the excavation and agitation shaft forms a ground. When excavating to the required depth and injecting stabilizer from the tip of the excavation stirring shaft into the excavated in-situ soil, stirring and mixing to solidify it, in the earth stopping soil wall excavator, when viewed in the elevation direction, the excavating bit and stirring A vertical flat plate is formed by tangentially connecting the tip circles of the excavating bit and the stirring blade to the lower position as close as possible to the blade, at an intermediate position between the two adjacent excavating bits and the stirring blade when viewed in plan. A vibrating plate that vibrates in the vertical direction is provided, a vertical vibration generator is installed in a non-movable part near the drill bit and the stirring blade, and the vibration is generated at the tip of a vibration shaft extending vertically downward from the vibration generator. Plate take The soil is excavated to the required depth with the excavation bit of multiple excavation stirring shafts, and the unexposed soil at the intermediate position between two adjacent excavation bits is scraped off with the vibration plate and the rectangular earth retaining soil wall is scraped. A rectangular pile stop soil wall excavator that is characterized by excavation.