JPH0872049A - Method and apparatus for treating excavated soil kneaded with mud mortar - Google Patents

Abstract

PURPOSE: To prevent the adhesion of earth and sand to the interior of an earth and sand separator or an earth and sand crusher even when excavated soil is clay or silty clay high in viscosity while smoothing the operation of an apparatus itself in the treatment of excavated soil. CONSTITUTION: Excavated raw soil 1 is thrown in a raw soil/water kneader 4 and a definite amt. of water is added to raw soil to be kneaded therewith to obtain raw soil/water kneaded matter 5 lowered in viscosity and the kneaded matter 5 is separated into a clod, a round stone and a gravel component by the earth and sand separatorcrusher 6 of a next stage and homogenized mud 7 is supplied to a mud mortar producing apparatus 8 to produce mud mortar by the kneading action with cement milk. In this treatment of excavated soil kneaded with mud mortar, when excavated raw soil is one other than clay or silty clay, the raw soil is directly separated into a clod, a round stone and a gravel component by the earth and sand separator-crusher 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating excavated soil mixed with mud mortar and an apparatus therefor, and in particular, cement and water are added to the excavated soil generated at a construction site or the like to produce mud mortar. The present invention relates to a pretreatment method and a device capable of producing a high-quality mud mortar by separating lumps, boulders, and gravel from excavated soil.

[0002]

2. Description of the Related Art In recent years, a shortage of industrial waste treatment facilities has become serious, and construction work is required to adopt a method of reducing waste. Especially in Japan, where the land area is small, there is a great need for underground development, and its scale is increasing year by year. The construction of these underground structures requires strong strength, and various foundation piles and earth retaining methods have been developed for that purpose.

Furthermore, the shortage of the disposal site of excavated soil as the residual soil is one of the big problems at present, and various techniques for effectively utilizing the excavated soil have been developed in order to solve this problem. One of them is the production of mud mortar, that is, the method in which cement and water are added to the excavated soil and kneaded to be used as a solid support board, foundation pile, earth retaining wall, or the like.
This mud mortar is also called soil cement, and it is also satisfactory in terms of strength and durability by compacting excavated soil or a mixture of supplementary material and cement of a few percent at the optimum water content ratio. The characteristics described above can be obtained, and it can be used not only in the above-mentioned fields of application but also for roadbed work and lining of sloped surfaces.

In view of the above, the present applicant puts the mud previously put into the mud tank into the weighing hopper while measuring the capacity by the screw conveyor, and runs the weighing hopper along the traveling rail. Using the crane column, it can be transferred to the upper, horizontal, and lower parts and conveyed to the upper part of the mixer, and the cement and fresh water separately generated in the cement silo can be flowed into the stirring tank and stirred to generate a certain amount. Send cement milk to the mixer with the excavated soil,
A method for producing a mud mortar and a device for producing the mud mortar by sufficiently kneading the cement milk and the mud in a mixer have been proposed.

According to such a device, the device can be used in a relatively narrow installation space and can be used in a narrow space, and in addition, by transmitting a control signal from the controller to each device to control the drive. The feature is that the operation is fully automated and the quality of mud mortar is uniform.

[0006]

The excavated soil to be mixed with the above-mentioned mud mortar has different properties and viscosity of the clod depending on the situation of the excavation site. Therefore, the excavated soil is directly sent to the mixer and mixed with cement milk. Then, the mixer may be damaged or the pipes of the concrete pump car may be clogged. Therefore, in order to solve this problem, it is necessary to separate or crush the clods, boulders, and gravel in the excavated soil.

In order to continue stable operation of the device,
It is desirable that the maximum diameter length of these clods is 50 mm or less. For that purpose, a sediment separator (grizzly) or a sand crusher (crusher) is generally used. However, when the excavated soil is clay or a silt system with high viscosity, the sediment separator or the sand crusher is used. There is a problem that the soil cannot be discharged because the soil adheres to it and the device itself cannot be operated.

Therefore, according to the present invention, regardless of whether or not the excavated soil is clay or a highly viscous silt system, the sediment is prevented from adhering to the sediment separating device or the sand crushing device, and the operation of the device itself is prevented. An object of the present invention is to provide a method and an apparatus for treating excavated soil to be kneaded with mud mortar that can be smoothly implemented.

[0009]

In order to achieve the above-mentioned object, the present invention uses excavated clay-silt-based raw material as the raw material.
Put into a water kneading machine, add a certain amount of water to the raw soil and knead to obtain a raw clay / water kneaded body with reduced viscosity, and the raw clay / water kneaded body is lumped by a sediment separating / crushing device, Separation of cobbles and gravel, supplying homogenized mud to a mud mortar production device and kneading mud mortar by a kneading action with cement milk. The device is configured. If the excavated original soil is other than clay / silt type, the excavated original soil is directly separated by a sediment separating / crushing device to separate clods, boulders, and gravel, and then the same step is followed by a mud mortar manufacturing device. Supply to.

The sediment separating and crushing apparatus comprises a hopper into which raw soil is put, a sediment separating apparatus using an inclined mesh, a crushing apparatus for lumps of soil, cobbles and gravel, a belt conveyor and a motor for driving the apparatus. are doing.

[0011]

[Operation] According to the method for treating excavated soil mixed with such mud mortar and the apparatus therefor, clay excavated at the construction site
First, the silt-type raw soil is put into the raw soil / water kneading machine, and is kneaded with a certain amount of water to obtain a raw clay / water kneaded body having a reduced viscosity. This raw soil / water kneaded product is put into a sediment separating / crushing device, and after the clod, cobbles, and gravel are separated by the sediment separating device, a homogenizing mud is obtained by crushing to an appropriate particle size by the crushing device. To be
This mud is supplied to the next-stage mud mortar manufacturing apparatus, and the mud mortar is manufactured by the kneading action with cement milk in the mixer.

When the excavated raw soil is a soil other than clay / silt type, the raw soil is directly added to the sediment separating / crushing device without the treatment by the raw soil / water kneader. The following work will continue. Therefore, even if the soil mass properties and viscosity are different depending on the situation of the excavation site, the maximum diameter length of the soil mass etc. can be homogenized to a predetermined value or less, for example 50 mm or less, and damage to the mixer or the piping of the concrete pump car Clogs and the like are efficiently prevented, and the operation of the device itself can be continued stably.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a method for treating excavated soil kneaded into mud mortar according to the present invention and an apparatus therefor. FIG. 1 is a schematic diagram generally showing a first embodiment of the present invention. In this example, a case of treating clay-silt excavated soil is assumed.

In the figure, 1 is an excavated raw soil, and 2 is a construction vehicle for carrying the raw soil 1. The construction vehicle 2 is provided with booms 3a and 3b, a bucket 3c, and various hydraulic devices.

Reference numeral 4 is a raw material / water kneading machine, and 5 is the obtained raw material / water kneading material. Further, 6 is a sediment separating / crushing apparatus, 7 is mud homogenized by the sediment separating / crushing apparatus 6, and 8 is a mud mortar production apparatus. Original soil
The water kneading machine 4 has a function of adding a certain amount of water to the excavated raw soil and kneading the raw soil / water kneading machine 4, and the raw soil / water kneading body 5 having a reduced viscosity based on the kneading action of the raw soil / water kneading machine 4 Is obtained.

The other sediment separating / crushing device 6 is shown in FIG.
As shown in (A), (B) and (C), the hopper 9, the earth and sand separating device 10, the crushing device 11 and the belt conveyor 12 have a basic configuration. Reference numeral 13 is a motor for driving the crushing device 11.

The operation of the first embodiment is as follows. First, the clay / silt-based original earth excavated at the construction site 1
Is put into the raw soil / water kneader 4 by operating the booms 3a, 3b and the bucket 3c driven based on the hydraulic device provided in the construction vehicle 2, and a certain amount of water is added to the raw soil 1. And kneaded to obtain a raw clay / water kneaded body 5 having a reduced viscosity.

Next, the raw soil / water kneading body 5 is put into a hopper 9 which constitutes the earth and sand separating / crushing device 6, and the earth / sand mass, cobbles, and gravel are separated by the earth / sand separating device 10 using an inclined mesh for driving. Crushing device 11 driven by motor 13
Belt conveyor 1 after being crushed to an appropriate particle size by
The mud 7 which is transported to the outside and homogenized by 2 is obtained. The mud 7 is supplied to the mud mortar manufacturing apparatus 8 in the next stage, and the mud mortar is manufactured by the kneading action with cement milk in the mixer.

FIG. 3 is a schematic view showing the second embodiment of the present invention as a whole, and in this embodiment, it is assumed that excavated soil other than clay / silt type is treated. The basic configuration is the first
It is the same as the embodiment and is shown with the same reference numeral.

In the figure, 1 is the excavated raw soil, 2 is a construction vehicle for transporting the raw soil 1, 6 is a sediment separating / crushing device, 7 is mud homogenized by the sediment separating / crushing device 6, 8 is an apparatus for producing mud mortar. In the second embodiment, the raw soil / water kneading machine 4 in the first embodiment is omitted. The structure of the sediment separating / crushing device 6 is described above (second
Figure)).

According to the second embodiment, the raw soil 1 other than the clay / silt system excavated at the construction site is put into the hopper 9 of the sediment separating / crushing device 6 by the operation of the construction vehicle 2 to separate the soil. The apparatus 10 separates lumps, cobblestones, and gravel, and then crushes them to an appropriate particle size by a crushing apparatus 11 and conveys them outside by a belt conveyor 12 to obtain homogenized mud 7. The method for producing mud mortar in the mud mortar production apparatus 8 for this mud 7 is the same as described above.

The construction and operation of the previously proposed mud mortar manufacturing apparatus 8 will be briefly described with reference to FIG. That is, the set weight by the load cell is measured after a certain amount of mud 7 is received by the hopper 15, and the capacity is measured by the screw conveyor 16 while the weighing hopper 17 is being measured.
The weighing hopper 17 is loaded into the mixer 19, transported upward, horizontally and downward along the portal crane column 18 and conveyed to above the mixer 19, and loaded into the mixer 19. Then, the cement and the fresh water produced in the separately provided cement silo flow into the agitation tank 20 to produce a certain amount of cement milk, and the cement milk is sent into the mixer 19 and the mud 7 and It is kneaded to produce mud mortar.

By adopting a batch type forced twin-screw mixer as the mixer, the stirring time can be freely changed according to the properties of the original soil, etc., and a control signal is transmitted from the controller to the mixer and cement silo to control the drive. By doing so, the operation is fully automated and the quality of the mud mortar is made uniform.

[0024]

As described in detail above, according to the method for treating excavated soil mixed with mud mortar and the apparatus therefor according to the present invention, the raw soil excavated at the construction site is clay or silt-based clay having a high viscosity. If it is, the raw soil is put into a raw soil / water kneader and kneaded with water,
A raw clay / water kneaded material with reduced viscosity is obtained, and the raw clay / water kneaded material is put into a sand / separation / crushing device to separate clods, boulders, and gravel particles, and then to an appropriate particle size by the crushing device. Crushed and homogenized mud is obtained. Also, if the excavated original soil is other than clay / silt series,
This raw soil can be directly put into the sediment separating and crushing equipment and the following work can be continued.

Therefore, even if the soil mass properties and viscosities differ depending on the excavation site, it is possible to homogenize the maximum diameter length of the soil mass to a predetermined value or less, and the mud is supplied to the mud mortar production device in the next stage. When this happens, damage to the mixer and clogging of the piping of the concrete pump car are eliminated, and the operation of the equipment can be stabilized.

In particular, regardless of whether the excavated soil is viscous or not,
Since the sediment is prevented from adhering to the sediment separating device or the sand crushing device, not only smooth operation but also the maintainability of the device itself is improved and the life is improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a first embodiment of a device for treating excavated soil to be mixed with mud mortar according to the present invention.

2 (A) is a front view of the earth / sand separating / crushing device adopted in this embodiment, FIG. 2 (B) is a moving side view, and FIG. 2 (C) is a partial plan view of the earth / sand separating device.

FIG. 3 is a schematic diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 1 ... Original soil 2 ... Construction vehicle 4 ... Original soil / water kneading machine 5 ... Original soil / water kneading body 6 ... Sediment separation / crushing device 7 ... Mud 8 ... Mud mortar production device 9 ... Hopper 10 ... Sediment separation device 11 ... Crushing device 12 ... Belt conveyor 13 ... Motor 15 ... Hopper 16 ... Screw conveyor 17 ... Measuring hopper 18 ... Gate crane support 19 ... Mixer 39 ... Stirrer

Claims (6)

[Claims] 1. An excavated clay / silt-based raw material is put into a raw material / water kneading machine, and a certain amount of water is added to the raw material and kneaded to obtain a raw material / water kneading material having a reduced viscosity. Then, the raw soil / water kneaded body is separated into lumps, boulders, and gravel by a sand / sedimentation / crushing device, and the homogenized mud is supplied to a mud mortar production device and mixed with cement milk to produce mud. A method for treating excavated soil by kneading with mud mortar, which comprises producing mortar. 2. The excavated raw soil is separated into lumps, cobbles, and gravel by a sediment separating / crushing device, and the homogenized mud is supplied to a mud mortar production device and mixed with cement milk to produce mud. A method for treating excavated soil by kneading with mud mortar, which comprises producing mortar. 3. A raw material / water kneading machine for adding a certain amount of water to an excavated clay / silt type raw material and kneading, and the lumps, cobbles, and gravel in the obtained raw material / water kneading body. A mud mortar characterized by comprising a soil / separation / crushing device for separating and crushing, and producing a mud mortar by kneading cement milk with the raw soil homogenized by the sand / separation / crushing device. Equipment for excavated soil to be mixed with. 4. A sediment separating and crushing device for separating and crushing soil blocks, cobblestones, and gravel in the excavated raw soil,
An apparatus for treating excavated soil for kneading mud mortar, characterized by kneading cement milk with the raw soil homogenized by the earth and sand separating / crushing device to produce mud mortar. 5. The gravel separating / crushing device comprises a hopper into which raw soil is put, a crushing device using an inclined mesh, a crushing device for clods, cobbles, and gravel, a belt conveyor, and a motor for driving the device. An apparatus for treating excavated soil to be kneaded with mud mortar according to claim 3 or 4. 6. The mud mortar manufacturing apparatus is provided with a mud tank into which mud is charged, a screw conveyer disposed directly below the mud tank, the capacity of which is measurable, and a discharge end of the screw conveyer. Weighing hopper, a gate-type crane prop that conveys the weighing hopper to the upper side of the mixer along the horizontal and vertical conveying paths, and receives cement and fresh water obtained from the cement silo to produce cement milk. 5. A mixing tank having a stirring mechanism for supplying the cement milk to the mixer, and a mixer for kneading the mud and the cement milk.
Alternatively, an apparatus for treating excavated soil, which is kneaded with the mud mortar according to item 5.