JP4743772B2 - Ground reinforcement construction method and construction equipment - Google Patents

Description

The present invention relates to a ground reinforcement construction method and construction equipment used for sabo work and the like.

  For example, since sabo work and the like are mainly carried out in so-called mountainous areas, it has been difficult to transport construction materials such as concrete and the construction efficiency tends to be low. In addition, since excavated soil disposal is required, the construction cost is increased, and noise and vibration due to excavated soil transportation, construction of a soil disposal site, and the like cause new environmental problems. On the other hand, riverbed gravel and cobblestones in so-called mountainous areas where the project is implemented are often of good quality. Utilizing these so-called mountainous riverbed gravel and cobblestones is not only environmentally friendly, but also from the viewpoint of cost reduction. It was considered effective and important. From such a background, it has been desired to develop a construction method that can effectively utilize locally generated sediment generated by excavation or the like when constructing a sabo facility.

  Therefore, the inventors of the present invention invented a patent No. 2500005 (name of the invention, a concrete foundation and a method for forming a foundation of a structure), obtained a patent on March 1, 1996, and An improved invention that can suppress the increase in construction cost to a minimum even when the amount of cobblestone and gravel collected from the plant is not sufficient or when the quality is not good, Patent No. 3528129 (Title of the concrete structure, ground reinforcement Construction method) was acquired on March 5, 2004. These inventions are generally known to consumers under the name of the so-called ISM method (In Situs Mixing) (in-situ mixing and solidification method).

In the invention of Japanese Patent No. 2500005, cobblestones and gravel obtained by excavating the ground such as riverbanks and riverbeds are used as the concrete aggregate of the foundation. First, cobblestones and gravel are laid in the depression, and then the shovel bucket Instead of mixing the cobblestone, gravel and cement milk by spraying the cement milk to the stirring position while stirring the cobblestone and gravel laid in the recess with the teeth of the rotating drum attached to the tip of the boom arm of the shovel. A foundation is formed by curing a kneaded body of cobblestone, sand gravel and cement milk over a required period. Therefore, in the said invention, it is necessary to install a cement milk production pumping plant near the said foundation formation location. And as above-mentioned, according to this construction method, it is effective in an environmental problem and it becomes possible to reduce construction cost significantly.
Patent No. 2500005 Japanese Patent No. 3528129

  However, for example, when a river channel is blocked by a landslide caused by a natural disaster such as an earthquake, it will be necessary to construct a sabo dam or reinforce the eroded riverbank as a restoration work. In many cases, the roads near the place where restoration work should be done have been damaged or lost. For this reason, the following problems arise when trying to perform these recovery operations using, for example, the ISM method.

  ・ Even after the construction road has been restored, there are many cases where the concrete mixer truck or concrete transport vehicle cannot reach the vicinity of the concrete placement site. For example, due to the nature of restoration work, it is necessary to start work without waiting for restoration of the terminal road to approach the concrete placement site, so in such cases it was difficult to carry out only with the conventional ISM method .

  ・ If the concrete placement site is the original riverbed or river channel, it is often difficult to install a cement milk production plant near the concrete placement site because of the narrow topography. In addition, even if a cement milk production plant is installed at one location, it is necessary to place concrete in multiple narrow locations along the river flow when performing construction related to riverbeds and river channels. In this case as well, conventionally, it is often impossible to perform construction at all the above-mentioned concrete placement locations.

The present invention has been made in view of the above circumstances, and its purpose is to provide a concrete milk production plant near a narrow place when the concrete placing place cannot be carried by the concrete carrying device. In any case where it cannot be installed, the concrete can be placed.
In other words, according to the present invention that improves the conventional construction method, it is possible to provide a construction method and a construction apparatus that enable construction in a place that could not be applied conventionally, and that can minimize construction construction costs. It is an object of the invention.

The present invention
Sediment materials containing cobblestones and gravel are collected at the site where the ground strengthening work is performed, and sediment materials with a particle size of a certain particle size or less are collected and collected from the collected sand material. In addition to adding the separately collected earth and sand material to the mixing material production tank, cement or cement milk and water are added and kneaded and stirred, and the resulting mixed material containing the earth and sand material of a certain particle size or less is sent out. By a member, it is sent out to a mixed material placement location existing in a location that is separated from the mixed material generation tank and cannot be conveyed by a conveying device.
It is characterized by
Or
Sediment materials containing cobblestones and gravel are collected at the site where the ground strengthening work is performed, and sediment materials with a particle size of a certain particle size or less are collected and collected from the collected sand material. In addition to adding the separately collected earth and sand material to the mixing material production tank, cement or cement milk and water are added and kneaded and stirred, and the resulting mixed material containing the earth and sand material of a certain particle size or less is sent out. By a delivery pipe equipped with a pump, it is delivered to a place where the mixture is placed away from the mixture production tank and cannot be carried by a carrying device.
It is characterized by
Or
A collection device that collects earth and sand materials including cobblestone and gravel at the site where the ground strengthening work is performed,
A separate collection device that separates and collects the collected sediment material into sediment material having a particle size of a certain particle size or less;
In addition to adding the separately collected earth and sand material, cement or cement milk and water are added and kneaded and stirred to produce a mixture material to which the earth and sand material of a certain particle size or less is added. A mixed material generating device provided in
An inlet is connected to the mixed material generating device, and an outlet is separated from the mixed material generating device, and a mixed material delivery pipe disposed at a mixed material placing position in a place where the mixed material is not transported by a conveying device;
Characterized by having,
Or
A collection device that collects earth and sand materials including cobblestone and gravel at the site where the ground strengthening work is performed,
A separate collection device that separates and collects the collected sediment material into sediment material having a particle size of a certain particle size or less;
Addition and input of the separately collected earth and sand material, cement or cement milk, and a mixed material generation tank for charging water,
A kneading / stirring apparatus for kneading and stirring the added and introduced earth and sand material of a certain particle size or less, and the charged cement or cement milk and water;
A mixed material delivery device for delivering the mixed material to which a soil material having a predetermined particle size or less generated by kneading and stirring is added;
An inlet is connected to the mixed material delivery device, and an outlet is spaced from the mixed material delivery device, and a mixed material delivery pipe disposed at a mixed material placement site in a place where the delivery device cannot be transported by a conveying device;
It is characterized by having
Or
The separation and collection device is formed of a heavy machinery shovel bucket, provided with a plurality of slits in the heavy machinery shovel bucket, and separately collects earth and sand material having a certain particle size or less passing through the slit.
It is characterized by
Or
The separate collection device is formed of a sieve-like member having a plurality of sieves having a constant diameter, and separately collects earth and sand materials having a fixed particle diameter or less that pass through the sieves.
It is characterized by
Or
The earth and sand material of a certain diameter or less is an earth and sand material of 50 mm or less,
It is characterized by
Or
The site where the ground strengthening work is performed is a site located in a mountainous area, and the mixed material placement site existing in a place where it cannot be transported by the transport device is separated from the mixed material generation tank installation site and the transport device It is a place where there is no connection road that can pass through.
It is characterized by
Or
The kneading and stirring device is formed of a rotating drum that is detachably attached to the tip of a boom arm of the heavy machinery.
It is characterized by this.

According to the present invention, with the conventional ISM method, even in the following cases where construction was impossible,
(1) When the concrete placement place is a place that cannot be transported by the concrete transport device,
(2) If the concrete milk production plant cannot be installed near the concrete placement site in a narrow place,
This construction method enables quick and reliable concrete placement. As a result, the construction cost of the concrete structure or the construction cost of ground reinforcement can be minimized.

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

First, the earth and sand material 1 containing cobblestones and gravel is collected locally to procure the concrete structure or ground strengthening work, for example, in the mountainous area where the concrete structure or ground strengthening work is performed. As can be seen from Fig. 1, local hills are excavated and local procurement is collected.
The collection device that performs this collection is not limited in any way, but a heavy machine 7 such as a hydraulic excavator is used, and the local earth and sand material 1 collected by the heavy machine 7 is loaded on a loading platform of a transport vehicle 11 such as a dump truck. Is done.

  The loaded earth and sand material 1 is accumulated at a predetermined location having a relatively large space even in the mountainous area of the site. As shown in FIG. 2 to FIG. A separate collection work is performed on the earth and sand material 2 of the above.

Thus, although there is no limitation on the configuration of the separate collection device for performing this separate collection operation, the general device used here will be described. It is conceivable to use the heavy machinery 7 used for collecting the material 1. That is, the normal type bucket 16 attached to the tip of the boom arm 15 of the heavy machine 7 is removed, the rotary cylindrical sieve 9 is incorporated inside, and the sieve type bucket 16 provided with a plurality of slits 14 on the bucket wall is replaced. It is possible to install and use.
That is, a rotating cylindrical sieve 9 is incorporated in the sieve-type bucket 16, and by rotating the rotating cylindrical sieve 9, the earth and sand material 2 having a certain particle size or less is selected from the earth and sand material 1. It can be separated.

  Here, the rotating cylindrical sieve 9 is composed of, for example, an attachment-type device, and the rotating cylindrical sieve 9 employs a mesh-like special screen, that is, a bucket wall provided with a plurality of slits 14, The earth and sand material 2 having a certain particle size or less passing through the slit 14 is separated and collected separately, so that no foreign matter is involved and the earth and sand material collected on-site can be separated and separated efficiently.

Further, as shown in FIG. 4, a large so-called grizzle 10 may be prepared, and the earth and sand material 1 may be separated and separated using the grizzly 10.
That is, the grizzly 10 is installed with a slope in a predetermined mountainous area, and the earth and sand material 1 placed on the transport vehicle 11 is dropped on the grizzly 10 from the upper part, so that the grizzly 10 is It sorts and sorts into the earth and sand material 2 of the magnitude | size below the fixed particle size which passed.

Here, the said grizzly 10 is generally used in a crushed stone plant etc., for example, it is used as fixing equipment so that it can sort into the aggregate which enters into the supply port of a crusher, and an aggregate larger than that. You can divert what you are using.
In general, the I-shaped steel or railway rails are arranged in parallel in a vertical lattice with a required gap, and are inclined so that the aggregate rolls.

  In this way, the sand material 1 having a certain particle size or less is selected from the earth and sand material 1 collected indiscriminately from small hills in the local mountainous area, sorted, collected, collected and collected at a predetermined accumulation location. deep.

Here, the reason why the earth and sand material 2 having a certain particle size or less is selected, sorted and further collected will be described.
The earth and sand material 2 having a size equal to or smaller than a certain particle size is used as a kind of additive added to cement milk manufactured by a cement milk manufacturing plant 13 erected on the site described later.
That is, in the mixed material production tank 3 provided in the field, the earth and sand material 2 having a certain particle size or less and the above-mentioned cement milk are mixed, kneaded and stirred to produce a mixed material having fluidity. Is done.

In this way, the mixed material is generated at the site, and the mixed material is further placed at a place far away from the cement milk production plant 13 or the mixed material generating tank 3 by the delivery pipe 5 described later. It must be sent to.
In this case, for example, unless it is a mixed material additive using the earth and sand material 2 having a diameter of 50 mm or less, it cannot pass through the delivery pipe 5 and has a flow rate of a certain level or more. It is because it becomes impossible to send out as a mixed material, for example, pressure feeding.

In addition, when the said mixed material placement location exists in a lower position, the said delivery pipe 5 can be installed in the downward gradient shape, and an internal mixed material can be sent out in the state of natural fall, but the said mixed material When the placement location is above the delivery port installation position of the delivery pipe 5, the delivery pipe 5 is installed in an upward gradient, and therefore the internal mixing material is used by using a pressure feed pump 18 described later. Must be pumped.
Moreover, it is not limited to the delivery pipe 5, As long as it is formed in the cylinder shape, a delivery hose, a delivery chute, a delivery belt conveyor, etc. may be sufficient.

As a result, it is necessary to sort and sort into the earth and sand material 2 having a size equal to or smaller than a certain particle size from the earth and sand material 1 procured locally.
By the way, if the earth and sand material 2 having a diameter of about 50 mm is used as an additive, the delivery pipe 5 having an inner diameter three times that of the delivery pipe 5, that is, an inner diameter of 150 mm is required. The

Next, the fluidity of the mixed material to be delivered will be described. When the delivery by the conventional delivery pipe 5 is not required, the slump value indicating the fluidity is about 8 to 20 cm. However, in the present invention in which delivery by the delivery pipe 5 or the like is an essential condition, when there is a delivery distance of about 200 m, a slump value of approximately 15 cm or more is required.
The separated and separated earth and sand material 2 having a size of a certain particle size or less, for example, a size of 50 mm or less, is collected at a predetermined collection place by a transport vehicle 11, that is, a transport vehicle 11 such as a dump truck (see FIG. 5).

Then, after that, for example, in the mixed material generating tank 3 provided in a relatively space space in a mountainous area, the earth and sand material 2 having a size less than or equal to the certain collected particle size, for example, a diameter of 50 mm or less. And other additives are added and charged, and for example, cement milk and water are charged from the cement milk manufacturing plant 13 and kneaded and stirred to produce a mixed material.
As for the other additives described above, in the case of the present invention, a complex of an oxycarboxylic acid compound and a naphthalene sulfonic acid compound is added as another additive to ensure fluidity. Yes. The amount added is 1 to 5% of the amount of cement.

Here, the production state and the delivery state of the mixed material according to the present invention are shown in FIGS.
As can be understood from the figure, the mixed material generation tank 3 excavates the ground on the site to form a substantially rectangular parallelepiped excavation hole, and forms a shield wall surface inside the excavation hole to form an on-site mixed material generation tank. 3 is formed. The shape of the mixed material generation tank 3 is not limited at all, and may be a square shape, an elliptical shape, or a parallelogram shape. However, it is considered that the rectangular shape is easier to knead and stir than the square shape.
As understood from FIG. 8, in this embodiment, five mixed material generation tanks 3 are formed on site.

Here, each of the mixed material generation tanks 3 is charged with the earth and sand material 2 having a size less than or equal to the separately collected particle diameter, for example, a diameter of 50 mm or less, by a bucket 16 of a heavy machine 7 such as a backhoe. The kneading with various mixed material additives and water, cement, cement milk, or the like is performed by a rotating drum 12 with a claw that can be exchanged and attached to the tip of a boom arm provided in a heavy machine 7 such as a backhoe.
A delivery port of a delivery pipe 17 provided so that cement milk can be delivered to the mixed material production tank 3 from a nearby cement milk production plant 13 or the like is attached to the vicinity of the claw rotating drum 12. The cement milk sent from the cement milk production plant 13 through the delivery port of the delivery pipe 17 is delivered into the mixed material production tank 3.

When the cement milk is delivered, the rotating drum 12 rotates to mix the cement milk, the separately collected and collected earth and sand material 2 having a diameter of not more than a certain particle size, for example, 50 mm or less, various mixture additives and water. Kneading and stirring are performed.
Subsequently, after kneading and stirring for a predetermined time, the generated mixed material 4 containing the earth and sand material 2 having a size of a certain particle size or less, for example, a size of 50 mm or less, has sufficient fluidity and has a pressure feed pump 18. The delivery pipe 5 is far away from the cement milk production plant 13 and the mixed material production tank 3 and cannot be transported by a transport device such as a transport vehicle 11, for example, a steep slope and a connection path only on a very narrow road. It will be sent to the place where the mixed material is not placed, that is, the place where the concrete structure or the ground reinforcement work is performed.

  FIG. 9 shows such a state, and the plurality of delivery pipes 5 are installed on a steep slope in a mountainous area where the transport vehicle 11 cannot come and go, and are mixed and stirred in the delivery pipe 5. The state where the produced mixed material containing the earth and sand material 2 having a size of a certain particle size or less, for example, a size of 50 mm or less is passed and delivered is shown.

  The steep slope in the mountainous region shown in FIG. 9 is a steep slope that is far away from the cement milk production plant 13 and the mixed material production tank 3 and cannot be transported by a transport device such as the transport vehicle 11, and is a very narrow connecting road. However, it is a place where there is no way to connect to the place where the mixed material is placed, that is, the place where the concrete structure or the ground reinforcement work is performed only through the steep slope.

FIG. 10 shows a state in which the mixed material delivered from the plurality of delivery pipes 5 is placed in the above-described concrete structure or place where the ground reinforcement work is performed. It is a place that is far away from the cement milk production plant 13 and the mixing material generation tank 3 and cannot be transported by a transport device such as a transport vehicle 11, a steep slope, and a very narrow place where there is no connection path. Even if there is no way to connect to the place where the material is placed, that is, the concrete structure or the place where the ground is to be strengthened, the ground can be strengthened quickly at the place where the ground is to be strengthened, and the foundation of the concrete structure can be quickly formed. It will be something that can be done.

BRIEF DESCRIPTION OF THE DRAWINGS It is structure explanatory drawing (the 1) of this invention. It is a structure explanatory view (the 2) of the present invention. It is composition explanatory drawing of a cylindrical sieve. It is composition explanatory drawing of grizzly. FIG. 3 is a configuration explanatory view (No. 3) of the present invention. FIG. 6 is a configuration explanatory view (No. 4) of the present invention. FIG. 6 is a configuration explanatory view (No. 5) of the present invention. FIG. 6 is a configuration explanatory view (No. 6) of the present invention. FIG. 7 is a configuration explanatory view (No. 7) of the present invention. FIG. 8 is a configuration explanatory view (No. 8) of the present invention.

DESCRIPTION OF SYMBOLS 1 Sediment material 2 Sediment material 3 or less of fixed particle size 3 Mixed material production tank 4 Mixed material 5 Delivery pipe 7 Heavy machine 9 Rotating cylindrical sieve 10 Grizzly 11 Transport vehicle 12 Rotating drum 13 Cement milk production plant 14 Slit 15 Boom arm 16 Bucket 17 Delivery Tube 18 Pressure feed pump

Claims (9)

Collect earth and sand materials containing cobblestones and gravel at the site where the ground reinforcement works
Collect and collect sediment materials with a particle size below a certain size from the collected sediment materials,
In addition to adding the separately collected earth and sand material to the mixed material generation tank provided at the site where the construction is performed, cement or cement milk, water is added and kneaded and stirred, and the generated particle size is below a certain particle size The mixed material containing the earth and sand material is sent out by the sending member to the mixed material placing place that is separated from the mixed material generating tank and cannot be carried by the carrying device.
A ground reinforcement construction method characterized by this.
Sediment materials containing cobblestones and gravel are collected at the site where the ground strengthening work is performed, and sediment materials with a particle size of a certain particle size or less are collected and collected from the collected sand material. In addition to adding the separately collected earth and sand material to the mixing material production tank, cement or cement milk and water are added and kneaded and stirred, and the resulting mixed material containing the earth and sand material of a certain particle size or less is sent out. By a delivery pipe equipped with a pump, it is delivered to a place where the mixture is placed away from the mixture production tank and cannot be carried by a carrying device.
A ground reinforcement construction method characterized by this.
A collection device that collects earth and sand materials including cobblestone and gravel at the site where the ground strengthening work is performed,
A separate collection device that separates and collects the collected sediment material into sediment material having a particle size of a certain particle size or less;
In addition to adding the separately collected earth and sand material, cement or cement milk and water are added and kneaded and stirred to produce a mixture material to which the earth and sand material of a certain particle size or less is added. A mixed material generating device provided in
An inlet is connected to the mixed material generating device, and an outlet is separated from the mixed material generating device, and a mixed material delivery pipe disposed at a mixed material placing position in a place where the mixed material is not transported by a conveying device;
Construction equipment for ground reinforcement characterized by having.
A collection device that collects earth and sand materials including cobblestone and gravel at the site where the ground strengthening work is performed,
A separate collection device that separates and collects the collected sediment material into sediment material having a particle size of a certain particle size or less;
Addition and input of the separately collected earth and sand material, cement or cement milk, and a mixed material generation tank for charging water,
A kneading / stirring apparatus for kneading and stirring the added and introduced earth and sand material of a certain particle size or less, and the charged cement or cement milk and water;
A mixed material delivery device for delivering the mixed material to which a soil material having a predetermined particle size or less generated by kneading and stirring is added;
An inlet is connected to the mixed material delivery device, and an outlet is spaced from the mixed material delivery device, and a mixed material delivery pipe disposed at a mixed material placement site in a place where the delivery device cannot be transported by a conveying device;
A ground strengthening construction device characterized by comprising:
The separation and collection device is formed of a heavy machinery shovel bucket, provided with a plurality of slits in the heavy machinery shovel bucket, and separately collects earth and sand material having a certain particle size or less passing through the slit.
The ground reinforcement construction apparatus according to claim 3 or 4 , characterized in that.
The separate collection device is formed of a sieve-like member having a plurality of sieves having a constant diameter, and separately collects earth and sand materials having a fixed particle diameter or less that pass through the sieves.
The ground reinforcement construction apparatus according to claim 3 or 4 , characterized in that.
The earth and sand material of a certain diameter or less is an earth and sand material of 50 mm or less,
The ground reinforcement construction apparatus according to claim 3, claim 4, claim 5, or claim 6 .
The site where the ground strengthening work is performed is a site located in a mountainous area, and the mixed material placement site existing in a place where it cannot be transported by the transport device is separated from the mixed material generation tank installation site and the transport device It is a place where there is no connection road that can pass through.
The ground reinforcement construction apparatus according to claim 3, claim 4, claim 5, claim 6, or claim 7 .
The kneading and stirring device is formed of a rotating drum that is detachably attached to the tip of a boom arm of the heavy machinery.
The ground reinforcement construction apparatus according to claim 3, claim 4, claim 5, claim 6, claim 7 or claim 8 .

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