JP6539101B2 - Method of kneading hydraulic material - Google Patents

Description

  The present invention relates to a method of kneading hydraulic material.

  Heretofore, various methods have been proposed as a method for kneading a hydraulic material, water and an aggregate, and for example, a method for kneading a hydraulic material using an agitator wheel is known (Patent Document 1, Patent Document 1) Literature 2).

  According to Patent Document 1, the above-mentioned kneading method supplies hydraulic material and water to a cylindrical drum disposed on a loading platform (chassis) with a predetermined space from the rear end of the driver's seat. It takes place in a cylindrical drum. Specifically, the hydraulic material and the water are fed into the drum using a hopper disposed behind the drum, and the hydraulic material and the water are kneaded by rotating the drum. Do.

JP, 2010-184432, A Patent No. 2875983

  However, as described above, when the hydraulic material is supplied from the hopper, the hydraulic material is supplied into the drum along the axial direction of the cylindrical side wall portion constituting the drum. The hydraulic material may be deposited on the hopper side in the drum. For example, a blade is formed in the drum so as to protrude from the inner peripheral surface of the cylindrical side wall portion (having a predetermined height) and extend in the axial direction of the side wall portion in a spiral manner. In the case, the blade is a barrier to the movement of hydraulic material in the axial direction in the drum. As a result, the hydraulic material hardly reaches the front side of the drum in the axial direction, and is deposited on the hopper side in the drum. Thus, when the hydraulic material is deposited on the hopper side in the drum, the entire blade is not effectively used when the hydraulic material and the water are kneaded in the drum, and the inside of the drum is It is feared that the kneading efficiency of the hydraulic material and the water in the above decreases and kneading unevenness occurs.

  In view of the above-mentioned circumstances, an object of the present invention is to provide a kneading method capable of uniformly kneading hydraulic material and water without unevenness in kneading in a drum of an agitator car.

The kneading method according to the present invention is
A kneading method of hydraulic material using an agitator,
The agitator vehicle comprises a self-propelled vehicle body and a drum mounted on the vehicle body and configured to be rotatable about an axis, the drum having a cylindrical side wall portion centered on the axis And the side wall portion is provided with a hole for communicating the space inside the side wall portion with the space outside the side wall portion,
A first feeding step of feeding water into the drum;
A second feeding step of positioning the hole above water contained in the drum and supplying the hydraulic material from the hole into the drum;
And a kneading step of manufacturing the kneaded material by rotating the drum in a state where the hole is closed after the second feeding step.

According to this configuration, in order to supply the hydraulic material into the drum from the hole formed in the cylindrical side wall, that is, the water in the drum from the direction intersecting the axial direction of the cylindrical side wall Because the hard material is supplied, the hydraulic material is less likely to be deposited at a specific position in the drum than when the hydraulic material is supplied into the drum along the axial direction of the cylindrical side wall. Thus, the hydraulic material and the water can be uniformly kneaded without unevenness in kneading in the drum.

In the kneading method according to the present invention,
The side wall portion is a cylindrical front shell that expands in a tapered manner from one end in the axial direction toward the other end, and the side wall expands in a tapered shape from the other end in the axial direction toward the one end A cylindrical rear shell, and a cylindrical center shell formed along the axis between the front shell and the rear shell;
The hole may be formed in at least one of the center shell and the front shell.

  According to this configuration, since the hydraulic material can be supplied into the drum from a position separated from the hopper, the hydraulic material is less likely to be deposited at a specific position on the hopper side in the drum. As a result, the hydraulic material and water can be uniformly and uniformly kneaded without unevenness in the condition that the hydraulic material is less likely to be deposited on the hopper side in the drum.

  As described above, according to the present invention, there is provided a kneading method capable of uniformly kneading the hydraulic material and the water without unevenness in the kneading in the drum of the agitator wheel.

It is a figure explaining the agitator car used in the 1st embodiment of the present invention. It is a figure which shows the vertical screw conveyor used for the agitator vehicle in the embodiment. It is a flowchart explaining the kneading method in the embodiment. It is a figure which shows the hopper used for the agitator vehicle used in the 2nd Embodiment of this invention. It is a flowchart explaining the kneading method in the embodiment.

The method of kneading a hydraulic material according to the embodiment is used when the hydraulic material and water are kneaded to produce a kneaded product. Examples of hydraulic materials include cement and lime (such as quick lime and slaked lime). Examples of cement include various portland cements such as normal strength, early strength, super early strength, moderate heat and low heat, white portland cement, blast furnace cement, silica cement, fly ash cement, alumina cement, super rapid-hardening cement and the like. These hydraulic materials may be used alone or in combination of two or more.
Moreover, in the said kneading | mixing method, if it is various additives added when preparing a concrete or mortar, it can be used according to a use. For example, additives or admixtures such as a setting retarder, a curing accelerator, an antifoamer, an antirust agent, an antirust agent, an antifreeze agent, a coloring agent, and a reinforcing material such as carbon fiber or resin fiber for improving durability can do.

  Hereinafter, a method of kneading a hydraulic material according to a first embodiment of the present invention will be described with reference to the drawings.

  First, the kneading installation 1 used for the kneading method of the hydraulic material which concerns on this embodiment is demonstrated, referring FIG. 1 and FIG. As shown in FIG. 1, the kneading equipment 1 is a kneading equipment for kneading a hydraulic material and water to form a kneaded material, and an agitator wheel 100 and an agitator having an appearance similar to that of a conventionally known agitator track. It is equipped with the supply installation 200 which is mounted in the vehicle 100 and supplies hydraulic material to the agitator vehicle 100.

  The agitator vehicle 100 includes a vehicle body 2 self-propelled by an engine, and a drum 3 mounted on the vehicle body 2 and configured to be rotatable about an axis. The vehicle body 2 includes a driver's seat 4, a chassis 5 having a predetermined length in the traveling direction, and a plurality of wheels 6. In the following description, “forward” means the front side of the agitator vehicle 100, and “rearward” means the rear side of the agitator vehicle 100.

The agitator vehicle 100 further includes a front receiving member 7 in front of the chassis 5 and a rear receiving member 8 in the rear. The front receiving member 7 bears the rotation shaft 14 (the rotation shaft 14 will be described later) of the drum 3. Further, the rear receiving member 8 is provided at its top with a plurality of rollers 9 rotatably receiving a rear shell 13 described later. The height of the front receiving member 7 is lower than the height of the rear receiving member 8 as shown in FIG. Therefore, the drum 3 is mounted on the chassis 5 so as to be inclined so that the front side is lower (in other words, the axis is inclined).
The agitator wheel 100 further includes a hopper 15 for charging a conventionally known hydraulic material to the drum 3 and a chute 16 for discharging the kneaded material after the kneading from the drum 3.

  The drum 3 has a cylindrical (specifically, cylindrical) side wall 3a centered on the axis, and an end wall (head plate) 10 closing one end of the cylindrical side wall 3a in the axial direction. And Further, the drum 3 is internally provided with a blade (not shown) which is formed so as to protrude from the inner peripheral surface of the cylindrical side wall 3a and extends in the axial direction of the side wall 3a. Further, one end (specifically, the end wall 10) of the drum 3 in the axial direction is connected to the vehicle body 2 via the rotation shaft 14.

  The side wall portion 3a is a cylindrical front that tapers (expands in diameter) from one end in the axial direction (the connection portion with the end wall 10) to the other end (that is, the rear of the agitator wheel 100). The shell 11, a cylindrical rear shell 13 which is tapered (expanded in diameter) from the other end in the axial direction toward one end (that is, the front of the agitator wheel 100), the front shell 11 and the rear shell 13 And a cylindrical (specifically, cylindrical) center shell 12 formed along the axis between them. In addition, the side wall portion 3a includes a hole 19 that allows the inner space (hereinafter also referred to as an internal space) and the outer space (hereinafter also referred to as an outer space) to communicate with each other. In the present embodiment, the side wall 3 a includes the hole 19 in the front shell 11. The hole 19 may be formed, for example, using a hole saw or the like, or may be formed by another conventionally known drilling method.

The front shell 11 has one axial end (i.e., the front end) welded to the outer peripheral end of the end wall 10 and the other axial end (i.e., the rear end) is the center shell 12. Welded to one axial end (i.e. the front end). The rear shell 13 has one end (i.e., the front end) welded to the other end (i.e., the rear end) of the center shell 12 and is open at the other axial end (i.e., the rear end) Have a department. A hopper 15 and a chute 16 are provided corresponding to the opening of the rear shell 13.
In addition, the rear shell 13 includes an annular portion 18 annularly formed along the outer periphery on the other end side in the axial direction (that is, the rear end side). The annular portion 18 is rotatably mounted on the plurality of rollers 9 of the rear receiving member 8.

  The end wall portion 10 is formed in a conical shape and disposed on the rear side of the driver's seat 4. The rotary shaft 14 is disposed so as to overlap the axis, and one end is connected to the end wall 10 and the other end is rotatably supported by the front receiving member 7. The rotating shaft 14 is rotationally driven in both forward and reverse directions by a hydraulic motor (not shown).

The supply device 200 is connected to a hopper 20 for containing hydraulic material, a powder transport device 21 for transporting the hydraulic material from the hopper 20 to the drum 3, a powder transport device 21 and the drum 3, And a transport pipe 22 forming a transport path from the transport device 21 to the drum 3. The transport pipe 22 is formed using a flexible hose or the like. Further, the supply device 200 is disposed on the chassis 5 between the driver seat 4 of the agitator vehicle 100 and the drum 3.
The dimensions and arrangement of the hopper 20 and the powder transport device 21 are designed to comply with the Road Traffic Act.

  The hopper 20 has an appearance similar to that of a conventionally known hopper. A first opening 20a and a second opening 20b are formed at the upper end and the lower end of the hopper 20, respectively, and hydraulic material is introduced from the first opening 20a, and the second opening 20b is inserted. Hydraulic material is discharged. The input of the hydraulic material into the hopper 20 can be performed by, for example, tearing the package containing the hydraulic material above the first opening 20a.

For the powder transport device 21, for example, a vertical screw conveyor 21a can be used. As shown in FIG. 2, the vertical screw conveyor 21 a includes a first tubular portion 21 a 1 extending in the horizontal direction and a second tubular portion 21 a 2 extending in the vertical direction. In addition, the vertical screw conveyor 21a includes, in the first and second tubular portions 21a1 and 21a2, helical wings extending along the transport direction of the hydraulic material, and the first and second helical wings rotate by rotating the helical wings. The hydraulic material is conveyed in the tubular portions 21a1 and 21a2.
In addition, the vertical screw conveyor 21a includes first and second power sources 21a1 'and 21a2' serving as power sources for rotating the spiral blades disposed in the first and second tubular portions 21a1 and 21a2.

  The first tubular portion 21a1 has an opening (not shown) on one end side, and is connected to the second tubular portion 21a2 at the position of the opening. Specifically, the first tubular portion 21a1 is connected to the second tubular portion 21a2 at the position of the opening in a state in which the first tubular portion 21a1 is disposed to be orthogonal to the second tubular portion 21a2. In addition, the first tubular portion 21a1 includes a hopper connecting portion 21a1 '' connected to the hopper 20 on the other end side. The hopper connection portion 21 a 1 ′ ′ includes an opening (not shown) formed along the length direction to open upward. The opening forms an opening substantially the same size as the second opening 20 b of the hopper 20. The opening of the hopper connecting portion 21a1 '' is connected to the second opening 20b of the hopper 20 disposed on the hopper connecting portion 21a1 ''. Thus, the hydraulic material supplied into the hopper 20 through the second opening 20b of the hopper 20 and the opening of the hopper connection portion 21a1 ′ ′ can be supplied into the first tubular portion 21a1. Become.

The second tubular portion 21a2 has an opening (not shown) on one end side, and is connected to the first tubular portion 21a1 at the position of the opening. Specifically, in a state where the second tubular portion 21a2 is disposed to be orthogonal to the first tubular portion 21a1, the first tubular portion 21a1 (more specifically, one end side) is disposed at the position of the opening. Connected with the opening of the As a result, the internal space of the first tubular portion 21a1 and the internal space of the second tubular portion 21a2 are in communication with each other through the respective openings, so that the first tubular portion 21a1 to the second tubular portion Inflow of hydraulic material to 21a2 becomes possible. In addition, the second tubular portion 21a2 is provided at the other end with a discharge hole 21a2 '' for discharging the hydraulic material from the internal space. The discharge hole 21 a 2 ′ ′ is connected to one end of the transport pipe 22. The other end of the transport pipe 22 is connected to a hole 19 formed in the drum 3. As a result, the hydraulic material in the second tubular portion 21a2 can be supplied into the drum 3 through the discharge hole 21a2 '' and the transport pipe 22.
By the way, discharge of the hydraulic material from the discharge hole 21a2 '' is performed by free fall, so the discharge hole 21a2 '' is disposed to form an acute angle with the second tubular portion 21a2.

  Below, the method to knead | mix a hydraulic material and water using the kneading installation 1 comprised as mentioned above, and manufacture a kneaded material is demonstrated.

  In the agitator wheel 100 as described above, when the hydraulic material is supplied from the hopper 15 to the internal space of the drum 3, as described above, the blade protrudes inward in the drum 3 to function as a stirring blade. As it is formed, the blade prevents the hydraulic material from entering the internal space of the drum 3. For this reason, the hydraulic material becomes difficult to be supplied to one end side (driver's seat 4 side) of the front shell 11 in the axial direction of the cylindrical side wall portion 3a, and is contained in the rear shell 13 (the hopper 15 side of the drum 3). It becomes easy to deposit. As a result, when the hydraulic material and water are kneaded in the drum 3, the entire blade can not be effectively used, and uneven kneading occurs, and there is a concern that the hydraulic material and water can not be uniformly kneaded. .

  Therefore, in the present embodiment, the hydraulic material is supplied into the drum 3 from the hole 19 formed in the side wall 3a (specifically, the front shell 11) of the drum 3.

  Next, the method of knead | hydraulizing hydraulic material is demonstrated using the kneading installation 1 of the said structure. In the present invention, the hydraulic material and water are kneaded according to the process flow as shown in FIG. First, the example of FIG. 3 will be described.

  FIG. 3 shows an example of producing a kneaded material using a hydraulic material containing no component other than cement. In such a case, aggregate is used in addition to cement and water. As the aggregate, only a fine aggregate is used when producing a mortar as a kneaded material, and a fine aggregate and a coarse aggregate are used when producing concrete as a kneaded material.

  First, water and aggregate are supplied into the drum 3 (step 1). The supply of water and aggregate into the drum 3 may be performed from the hopper 15 or may be performed from the hole 19.

  Next, the hydraulic material stored in the hopper 20 is supplied into the drum 3 (step 2). The supply of the water-curable material from the hopper 20 into the drum 3 is performed by rotating the drum 3 on the rotating shaft 14 until the hole 19 is positioned above the water and aggregate contained in the drum 3 in step 1 And from the hole 19 at this position. The hydraulic material is supplied from the hopper 20 to the drum 3 under the condition that the transport pipe 22 is not clogged due to the deposition of the powder.

Next, the hydraulic material, water and aggregate are kneaded in the drum 3 (step 3). Specifically, after completion of Step 2, the hydraulic material, water, and aggregate are kneaded by rotating the drum 3 in a state where the hole 19 is closed by the lid material. The operating conditions of the drum 3 are appropriately set in consideration of the nature and amount of the hydraulic material and aggregate, or the mixing ratio of the hydraulic material and water to the aggregate.
The lid is formed to have a diameter larger than the diameter of the hole 19, and is attached to the side wall 3a around the hole 19 so as to be openable / closable or removable. Specifically, one end of the lid is fixed to the side wall 3a of the drum 3 with a hinge, the ospin is disposed at the other end of the lid, and the mespin is disposed at a position opposite to the ospin of the side wall 3a of the drum 3 Do. Alternatively, the mespin is disposed on the side wall portion 3a of the drum 3 around the hole 19 so as to surround the hole 19, and the ospin is disposed at a position corresponding to the mespin of the lid material.

  The kneaded material of the hydraulic material, the water, and the aggregate, which is kneaded according to the above-described process flow, is discharged from the chute 16 to the outside of the drum 3 and used at the construction site.

The example of producing the kneaded material according to the flow shown in FIG. 3 is useful when the amount of the kneaded material used at the construction site can be increased by the amount of the one batch of the kneaded material to be kneaded in the drum 3. In such a case, if Step 1 of mixing water and aggregate is performed before arrival at the construction site, Steps 2 and 3 can be easily performed after arrival at the construction site.
This kneading method is particularly suitable for the example of producing concrete as a kneaded material. This is because it is possible to save time and effort of throwing coarse coarse aggregate into the drum 3 at the construction site.
Further, this kneading method is also useful in the case of construction using ultra rapid-hardening cement having the property of becoming a hardened body in about a dozen minutes (10 to 15 minutes) and reaching practical strength in a few hours.

  Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. In the following, differences from the first embodiment will be mainly described, and the same components will be assigned the same reference numerals and descriptions thereof will be omitted.

  The second embodiment differs from the first embodiment in that the first opening 20a of the hopper 20 is provided with a piercing device 20c, as shown in FIG. The piercing device 20c comprises a framework 20c1 and a projection 20c2. The framework 20c1 includes a plurality of frames 20c1a. The plurality of frames 20c1a are arranged radially toward the inner peripheral surface of the side wall of the hopper 20 from the approximate center of the hopper 20. Each frame 20c1a has one end joined to the inner surface of the side wall of the hopper 20, and the other end joined to a substantially central portion of the hopper 20. The protrusion 20c2 is disposed to extend vertically upward substantially at the center of the hopper 20 to which the other ends of the plurality of frames 20c1a are joined, and the tip (the side where the plurality of frames 20c1a are not joined is ) Is pointed.

  In the present embodiment, the hopper 20 is charged with a mixture of hydraulic material and aggregate (for example, a premix mortar), and the mixture is usually contained in a soft packaging (so-called flexible container). It is included. Then, the mixture is put into the hopper 20 by using the punching device 20c. Specifically, the flexible envelope is brought into contact with the tip of the projection 20c2, and the projection 20c2 is used to break the flexible envelope. When such a piercing device 20c is used, it is possible to save the worker the time and effort to break the package material above the first opening 20a of the hopper 20.

  In the present embodiment, the mixture of the hydraulic material and the aggregate and the water are kneaded according to the process flow as shown in FIG. 5 to produce a kneaded material.

  First, water is supplied into the drum 3 (step 1). The supply of water into the drum 3 may be performed from the hopper 15 or may be performed from the hole 19.

  Next, a mixture of hydraulic material and aggregate contained in the hopper 20 is fed into the drum 3 (step 2). The supply of the mixture from the hopper 20 into the drum 3 is performed by rotating the drum 3 with the rotary shaft 14 until the hole 19 is positioned above the water contained in the drum 3 in step 1 and in this position It does from the hole 19. The supply of the mixture from the hopper 20 to the drum 3 is performed under the condition that the transport pipe 22 is not clogged due to the deposition of the powder.

  Next, the mixture and water are kneaded in the drum 3 (step 3). Specifically, after completion of step 2, the mixture and water are kneaded by rotating the drum 3 in a state where the hole 19 is closed. The operating conditions of the drum 3 are appropriately set in consideration of the nature and amount of the mixture, the mixing ratio of the mixture and water, and the like.

  The mixture of the mixture and water, which has been kneaded according to the above-described process flow, is discharged from the chute 16 to the outside of the drum 3 and used at a construction site.

The example of producing the kneaded material according to the flow shown in FIG. 5 has a large amount of the kneaded material used at the construction site, and is useful when continuously manufacturing the kneaded material at the construction site. In such a case, a mixture of a desired amount of hydraulic material and aggregate is enclosed in a package and transported separately to a construction site, and the above mixture and water for producing a first batch of kneaded material are used. , And stored in the hopper 20 and the drum 3, respectively. In this way, when the first batch of the kneaded material is used up at the construction site and the second and subsequent batches of the kneaded material are manufactured, it is possible to immediately knead the water and the mixture that has been carried.
In addition, when it is possible to arrive at the construction site while the mixture can be constructed, if all the steps 1 to 3 of FIG. 5 are performed before arrival at the construction site, the kneaded material is manufactured at the construction site, One batch of kneading can be omitted. Therefore, the first batch of the kneaded material can be used immediately after the construction site arrives, and the construction time can be shortened.

  In addition, the kneading method of the hydraulic material which concerns on this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention. The configurations, methods, and the like of the plurality of embodiments described above may be arbitrarily adopted and combined (the configuration, the method, and the like according to one embodiment may be applied to the configurations, the methods, and the like according to the other embodiments). Further, it goes without saying that configurations, methods and the like according to various modifications described below may be arbitrarily selected and adopted in the configurations, methods and the like according to the above-described embodiment.

  For example, although the example which forms the hole 19 in the front shell 11 was demonstrated in 1st Embodiment and 2nd Embodiment, the position which forms the hole 19 is not restricted to this. The position where the hole 19 is formed may be the center shell 12 or may be both the front shell 11 and the center shell 12. It is also possible to form the hole 19 in the rear shell 13. However, if the hole 19 is formed in the rear shell 13, the hydraulic material is supplied into the drum 3 from a position close to the hopper 15, so the hydraulic material easily contacts the blade provided in the drum 3. The hydraulic material tends to be deposited at a specific position on the hopper 15 side in the drum 3. If the hydraulic material and water are kneaded while the hydraulic material is deposited at such a specific position, uniform kneading becomes difficult. In addition, it is feared that the supply distance from the hopper 20 becomes long, and the installation height of the hole 19 becomes high to cause a problem on the operation safety. Therefore, it is desirable to form the hole 19 in one or both of the front shell 11 and the center shell 12. When the holes 19 are formed in the center shell 12, holes (service holes) provided in the center shell 12 may be used to periodically clean the drum 3. Here, since the frequency of opening and closing of the service hole is usually low, the hole is covered with a lid having a diameter larger than the diameter of the hole, and the lid is fixed to the side wall 3a of the drum 3 with a bolt and a nut and closed. ing. In such a conventional configuration, it is troublesome to remove the lid before the hydraulic material is introduced. Therefore, when using a service hole as the hole 19, the lid may be attached to the side wall 3a of the drum 3 in an openable / closable or removable manner as in the first and second embodiments.

  Further, the method of supplying the hydraulic material from the hopper 20 to the drum 3 is not limited to the example using the vertical screw conveyor 21a. Hydraulic material is supplied from the hopper 20 to the drum 3 using a tubular portion connecting the hopper 20 and the drum 3, a spiral screw disposed in the tubular portion, and a power source for driving the spiral screw. It is also good.

  In addition, the piercing device 20c shown in the second embodiment may be provided in the first opening 20a of the hopper 20 of the first embodiment.

  In the method shown in the first embodiment, instead of the hydraulic material, a mixture of the hydraulic material and the aggregate used in the second embodiment may be employed. In this case, according to the process flow shown in FIG. 5, the mixture and the water are kneaded in the kneading equipment 1 which is not provided with the piercing device 20c at the first opening 20a of the hopper 20 to produce a kneaded material. Concretely, concrete can be manufactured as a kneaded material by supplying and kneading a mixture of cement and fine aggregate in the drum 3 to which the coarse aggregate and water are supplied.

The present invention is capable of various embodiments and modifications without departing from the broad spirit and scope of the present invention. Moreover, the above-mentioned embodiment is for describing this invention, and does not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiments but by the claims. And, various modifications made within the scope of the claims and the meaning of the invention are considered to be within the scope of the present invention.

  Reference Signs List 1 kneading apparatus, 3 drums, 11 front shells, 12 center shells, 13 rear shells, 19 holes, 100 agitator cars

Claims (4)

A kneading method of hydraulic material using an agitator,
The agitator vehicle is disposed between a self-propelled vehicle body , a drum mounted on the vehicle body and configured to be rotatable about an axis, a driver seat of the agitator vehicle, and the drum. And a supply device for supplying hydraulic material to the drum ,
The drum is provided with a cylindrical side wall portion centered on the axis, and the side wall portion is provided with a hole for communicating the inner space of the side wall portion with the outer space.
The supply device includes a hopper for containing hydraulic material, and a powder transport device for transporting the hydraulic material from the hopper to the drum.
A first feeding step of feeding water into the drum;
The hole is positioned above the water contained in the drum, the hydraulic material contained in the hopper is transported to the drum by the powder transport device, and the hydraulic property is provided from the hole. A second feeding step of feeding material into the drum;
After the second supplying step, the drum is rotated in a state in which the hole is closed to produce the kneaded product;
Method of kneading hydraulic material. The side wall portion is a cylindrical front shell that expands in a tapered manner from one end in the axial direction toward the other end, and the side wall expands in a tapered shape from the other end in the axial direction toward the one end A cylindrical rear shell, and a cylindrical center shell formed along the axis between the front shell and the rear shell;
The hole is formed in at least one of the center shell and the front shell.
The kneading method of the hydraulic material of Claim 1. In the first feeding step, aggregate is further fed into the drum, and in the second feeding step, the hole is positioned above water and aggregate in the drum. Supplying the hydraulic material into the drum from the hole;
The kneading method of the hydraulic material of Claim 1 or 2. In the second feeding step, a mixture of hydraulic material and aggregate is fed into the drum.
The kneading method of the hydraulic material of Claim 1 or 2.

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