JP2001020273A - Supply system for ground improving material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform gas transportation for improving material continuously and also avoid stagnation of a tank lorry by feeding the improving material to a silo during work when performing ground improvement work by fine particles jetting agitation with cement such as DJM or the like. SOLUTION: A cutoff valve 12 by gas operation such as butterfly valve is provided from a bent portion 6" of a vertical screw conveyor from silo 3' to a laterally drawn screw conveyor 6, a feedback path 13 by bypass is provided from a residence portion of the lateral screw conveyor 6 to the silo 3', and also a bypass path 14 is provided for the vertical screw transport 6' and continuous supply of the improving material to the hopper 8 is performed through the feedback of the improving material and devices at a convective stagnant portion and continuous cushioning action. And orderly carrying-in operation by tank lorries at equipment parking area can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The disclosed technology relates to a technique for performing a predetermined ground improvement work, such as injecting and injecting an improved material into a ground through a casing pipe inserted into the ground in a powder injection and stirring work (hereinafter abbreviated as DJM method). Belongs to the technical field of supply system of improvement materials when performing construction.

[0002]

2. Description of the Related Art As is well known, in Japan, where the land is narrow, there are many mountain forests, and especially on a special terrain where a complicated long coastline is approaching, not only agricultural and livestock,
The plain area that can be effectively used for the construction of residential areas and various industrial facilities is extremely limited.Therefore, the specified improvement materials have been used to improve the soft ground of the basins such as shallow coasts and rivers and lakes. Civil engineering techniques such as spraying into the ground to improve the ground have been actively used.

[0003] However, in the conventional soft ground improvement work, many of the improved materials are liquid-based improved materials. Therefore, the improved materials are not compatible with the liquid content of the soft ground, and the improved materials escape in the ground. In order to deal with this, many methods have been devised, such as the so-called DJM, in which powder injection and agitation such as cement is injected into the ground to improve the ground. Are beginning to be mentioned.

[0004] As shown in FIG. 2, a system used for this kind of DJM construction includes a tank lorry 4 loaded with an improved material such as cement or the like in a silo 3 on one side of a plant 2 to be a system 1 in the vicinity of the silo 3. The improved material loaded by gas transport of air or the like is fed to the silo 3, where the upper hopper 8 of the ground improvement machine feeder is fed from the horizontal screw conveyor 6 via the vertical screw conveyor 5 to the horizontal screw conveyor 6.
Was to be supplied to.

[0005] The hoppers 8, 8, etc., control the material feed material management device 7 by using the rotary feeder 10 and the ejector 1.
1, a cement or the like as an improving material is supplied to a casing pipe (not shown), and injection is performed into the ground.

However, when gas is supplied from the tank truck 4 to the silo 3, the pressure of the gas is
From the hopper 8 to the material supply management device 7, there is a problem that accurate material management cannot be performed. Therefore, during this time, the supply of the improving material from the silo 3 to the hopper 8 needs to be interrupted, and therefore, in the powder injection and agitation of the improving material, an intermittent operation is performed. It is also necessary to stop the operation of
In addition, when the timing is difficult to stop, there is a disadvantage that the improved material supply tank lorry 4 has to wait in the vicinity of the plant system 1, and there is a disadvantage that the construction efficiency is reduced. In such areas, there is a problem that there is a case where there is not enough room for the tank lorry 4 group to park and stand by.

[0007] As a result, the construction period is prolonged and the cost is increased.

[0008]

SUMMARY OF THE INVENTION It is an object of the invention of this application to provide the above-mentioned prior art, which has many excellent advantages of the powder injection and agitation of an improving material such as cement for gas transportation, but also has a gas transportation in the system of the construction plant. The technical problem to be solved is that the improvement material stays in the silo from the silo to the screw conveyor, and that the improvement material is smoothly fed into the silo without impairing the function of the rotary feeder and ejector of the improvement material device. To eliminate the need to wait for tank trucks and the like in parking lots, improve construction efficiency, inexpensive and safe, and enable highly efficient powder injection and agitation. To provide an excellent ground supply system that benefits

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the construction of the invention of the present application for solving the above-mentioned problems is described as follows. In a system in which the improving material is gas-supplied, and then the improving material is supplied from a silo to a hopper for transporting the improving material supplying device or the supplying material via a screw transport, the screw transport from the silo to the hopper is performed by air. And the like, which is based on the provision of a gas shut-off valve, etc., and has taken technical measures such that the gas shut-off valve is interlocked with screw transport at a preset timing. is there.

[0010]

[Function] In the above-described configuration, a tank lorry containing the improved material is parked in the site yard of the plant system when the improved material such as cement is injected into the ground, the powder is injected and agitated, and the ground is improved. Then, via a gas transport such as pneumatic transport, the improved material loaded on the tank lorry is gas-transported to a silo of a plant, and a load cell or the like of a hopper of an improved material supply device of a material supply mechanism is provided from the silo. When feeding to the hopper of the material supply management device that is vertical screw, and horizontal pulling screw,
Insufficient gas such as air used to clean the spherical valve in the upper pressure section of the hopper, and interferes with the back pressure of the rotary feeder and ejector provided at the lower part of the improving material supply device. On the other hand, the silo is bypassed from the tip of the hopper of the horizontal pulling screw through the bypass passage, and the control is performed by interlocking the shut-off valve provided at the top of the vertical silo with the operation of the screw provided beforehand in the silo. Automatically transporting and stopping the improved material, the smoothing of the improved machine in the improved material supply device to the rotary feeder and ejector can be carried out, and the DJM construction by powder injection and stirring as designed is performed. In the vertical screw transport, a bypass transport passage is provided to further prevent stagnation of transport gas in the vertical screw. It is obtained by way.

[0011] In the above configuration, when the improvement material is loaded into the silo by transporting the vehicle from the tank lorry loaded with the improved material,
Reversely connecting the bypass passage to the silo from the upper part of the hopper that transports the improved material from the side to the hopper by a screw conveyor in order to prevent malfunction of the material supply management device provided in the improved material feeder directly connected to the silo, Also, by connecting the screw conveyor from the upper part of the vertical screw conveyor connected from the silo to the silo, and providing the vertical screw conveyor and the horizontal pulling screw, there is no interference due to the back pressure of the rotary feeder or ejector of the silo. When the work is interrupted when switching the casing pipe, without stopping the transportation of the improved material from the silo to the hopper, a shutoff valve such as a butterfly valve is provided in the middle of the hopper from the silo and set in advance. At the timing, the air shutoff valve is linked to the operation of the screw conveyor, Prevent congestion parked state of the tank truck in the machine park, it is obtained as efficiently stirred powder injection is performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of an embodiment of the present invention as an embodiment of the present invention, with reference to FIG. ,

FIG. 2 is described using the same reference numerals.

First, in the embodiment shown in FIG. 1, reference numeral 1 'denotes a plant system which forms the core of the present invention. In this embodiment, the ground is improved by injection and agitation of powder of cement or the like. A silo 3 'is provided on one side in the same manner as in the conventional mode, and an improving material such as cement loaded on a tank truck (not shown) is transported by gas such as air and stored in the silo 3'.

The silo 3 'is once raised by the vertical screw conveyor 6' in the same manner as in the conventional manner, and the improved material is applied to the laterally drawn screw conveyor 6 from the bent portions 6 '' at both ends in a baton-touch manner. The material is transported and supplied to a hopper 8 as a material supply amount control device having a load cell and the like. In the invention of this application, the leading end portion 12 of the horizontal drawing screw conveyor 6 above the hoppers 8 and 8 is used. In this case, since a portion where the air stagnates occurs, the bypass passage 13 is branched from the portion to feed back to the silo 3 '.

In the vertical screw conveyor 6 'as well, when the shut-off valve 12 of the butterfly valve is closed, the gas stagnates.
'' Also feeds back the bypass passage 14 to the silo 3 ′.

As described above, according to the invention of the present application, the rotary feeder 1 is used during the powder injection and agitation.
Without impairing the function of the zero and the ejector 11, it is possible to smoothly feed the improved material into the silo,
Further, during this time, the stagnation of the gas and the material in the stagnation section 12 is fed back to the silo 3 'via the bypass passages 13 and 14, so that the improved material is smoothly transported to the silo 3', and the tank lorry in the parking area is transported. Congestion is avoided, and efficient operation can be achieved.

Although not described in detail in the invention of this application, the opening and closing of the shutoff valve 12 of the butterfly valve is described below.
Various modes can be adopted, such as automatic operation so as to interlock with the operation of the screw at a designated timing in advance.

[0019]

As described above, basically, according to the invention of this application, when performing ground improvement construction work by powder injection and agitation construction such as DJM, an improving material such as cement is temporarily loaded on a tank lorry and parked. From the state of being transported to the plant, the gas is transported from the tank lorry and the improved material is transported to the silo, and further supplied to the hopper of the material supply amount management device via the vertical screw conveyor or the horizontal drawing screw conveyor. There is no need to interrupt the gas transport of the improver to avoid stagnation of gas or improver immediately above, and there is no need to wait for tank trucks at the tarmac, and the horizontal screw conveyor and vertical screw conveyor Is connected to the silo by feedback through the bypass passage from Even if a butterfly valve shutoff valve is provided in the middle part of the screw for the air and the improvement material to be fed back to the silo, continuous gas transportation of the tank lorry of the continuous improvement material is performed, and the tank lorry in the parking area is orderly. An excellent effect that the carrying-in work can be performed is exhibited.

Further, even during the construction, since the gas transport of the improving material can be continuously performed without interruption, the ground improvement work such as powder injection stirring can be smoothly performed as designed.
An excellent effect is achieved in that finishing is performed efficiently and with the accuracy as designed.

Therefore, an excellent effect that the reliability of the constructed improved ground is also improved is exhibited.

Further, in a plant system, a butterfly valve or the like is provided on a vertical screw conveyor or a horizontal screw conveyor from a conventional silo, and further, a bypass passage is simply connected to the screw conveyor by feedback in a silo. Since the operation is simple and the work is sufficient, there is no initial cost, and the effect is that the maintenance and inspection and the operation are simple.

It is extremely easy for a person skilled in the art to link the opening and closing of a shutoff valve such as a butterfly valve with a screw so as to be linked at a preset timing.

[Brief description of the drawings]

FIG. 1 is a schematic side view of the invention of this application.

FIG. 2 is a schematic side view of a system according to the prior art.

[Explanation of symbols]

 2 Plant 3 'Silo 4 Tank lorry 6, 6' Screw transport 7 Improvement material supply device 9, 9 Supply control mechanism 8 Hopper system 12 Air shutoff valve 13, 14 Bypass transport 14 Other bypass transport passage

Continuation of the front page (72) Inventor, Nobuhide Kinoshita 1-2-7 Koraku, Bunkyo-ku, Tokyo Sanshin-ken Construction Industry Co., Ltd. (72) Inventor Tatsuhiko Nakanishi 1-2-7, Koraku, Bunkyo-ku, Tokyo Sanshin-ken Industrial Co., Ltd. F term (reference) 2D040 AB03 BA02 CA01 CB01 EB04

Claims (2)

[Claims] 1. An improvement material is supplied by gas from a tank truck to a silo of a powder injection and stirring plant, and then the improvement material is supplied from a silo to a hopper having a supply amount mechanism of an improvement material supply device via a screw transport. A ground improvement material supply system, characterized in that a gas shutoff valve is provided in the middle of the transportation of the improvement material from the silo to the hopper. 2. The ground improvement material supply system according to claim 1, wherein said gas shut-off valve is interlocked with screw transport at a preset timing.