JP6393176B2 - Slurry injection device - Google Patents

Description

  The present invention relates to a slurry injection apparatus that performs injection control of slurry injected into soil in ground improvement.

  In ground improvement, when soft soil is improved, solidification material such as cement (hereinafter referred to as slurry material) is generally added to stir the target soil to strengthen the ground. . By sufficiently diffusing the slurry material into the soil and mixing it uniformly, the ground strength can be increased. However, it is difficult to sufficiently disperse the slurry material in the soil and mix it uniformly, and related techniques such as those shown in Patent Documents 1 and 2 are disclosed for such problems.

  In the technique shown in Patent Document 1, the nozzle chamber 3 of the solidifying material ejecting apparatus 1 connected to the solidifying material pumping pipe 2 includes an acceleration chamber (acceleration region) 4 and a diffusion chamber (diffusion region) 5 from the upstream side. A flat slit-like discharge port 5 a is formed in the diffusion chamber 5, a diffusion plate 7 is disposed in the diffusion chamber 5, and compressed air is introduced from the compressed air introduction port 6 of the acceleration chamber 4. The solidified material is pressurized and accelerated in the acceleration chamber 4 and further diffused in the diffusion chamber 5 and finally diffused and ejected from the discharge port 5a.

  The technique shown in Patent Document 2 includes a rotating shaft 1, stirring blades 3 </ b> A and 3 </ b> B, a supply pipe 2 provided along the rotating shaft 1, and a supply device 10 for solidified fluid. In the ground mixing treatment method for mixing the solidified fluid discharged from the lower end side of the supply pipe line 2 and the in-situ soil in the intrusion or drawing process into the ground, the supply device 10 is a solidified supply means for the fluid. 11 has a compressed air supply means 12, and the supply pipe line 2 has a fluid pipe line 2 A connected to the solidification system supply means 11 and a compressed air pipe line 2 B connected to the compressed air supply means 12. And it has the mixing ejector 13 adhering to the rotating shaft 1 or the stirring blade 3B side, and a fluid is accompanied with compressed air from the discharge port 13c of the mixing ejector 13, and is ejected in the shape of a mist.

JP 2003-206526 A JP 2002-013131 A

  However, the techniques shown in Patent Documents 1 and 2 improve the diffusion and mixing of the solidified material by ejecting the solidified material using pressurized or compressed air, but the ejection mode is constant. Therefore, there is no change in the ejection mode, which is not sufficient as a technique for improving diffusion and mixing.

  The present invention provides a slurry injection device that improves the diffusion state and mixing state of a slurry material by controlling the injection of the slurry material unsteadyly in the injection of the slurry material in ground improvement.

  The slurry injection device according to the present invention is attached to the tip of an arm of a heavy machine that performs ground improvement, and is provided along with the stirrer that stirs the soil of the target ground when performing the ground improvement. And a pipe for pumping slurry to be put into the soil, and a jet control means for controlling the jet mode of the slurry to an unsteady state in a supply path through which the slurry is fed into the soil. is there.

  Thus, in the slurry injection apparatus according to the present invention, since the slurry ejection mode is controlled to an unsteady state, compared to the case where the slurry is ejected in a steady state maintained at a constant state, the slurry is diffused and mixed. The degree can be increased, and the effect of improving the quality of ground improvement can be achieved.

  In the slurry injection apparatus according to the present invention, the ejection control means controls the slurry to pulsate and eject.

  As described above, in the slurry injection device according to the present invention, since the slurry is controlled to be pulsated and ejected, the slurry is diffused and mixed as compared with the case where the slurry is ejected in a steady state maintained in a constant state. As a result, the quality of ground improvement can be improved.

  In the slurry injection device according to the present invention, the control means has a squeeze pump, and controls the operation of a rotating roller in the squeeze pump to pulsate the ejection of the slurry.

  Thus, in the slurry injection apparatus according to the present invention, the control means has a squeeze pump, and controls the operation of the rotating roller in the squeeze pump to pulsate the ejection of the slurry. There is an effect that the degree of mixing can be improved.

  In the slurry injection apparatus according to the present invention, the control means has a branch pipe that branches a part of the pipe and joins the pipe again.

  Thus, in the slurry injection apparatus according to the present invention, since the branch pipe that branches a part of the pipe and joins the pipe again has a branch pipe, it is possible to pulsate the ejection of the slurry by the pressure difference in the branch and the join of the slurry. It is possible to improve the degree of slurry diffusion and mixing.

  In the slurry injection apparatus according to the present invention, the control means has a vacuum generation means for making a part of the piping into a vacuum state, and pulsates the ejection of the slurry by controlling the generation state of the vacuum. .

  As described above, the slurry injection apparatus according to the present invention has a vacuum generating means for generating a vacuum state, and can control the generation state of the vacuum to pulsate the ejection of the slurry, thereby diffusing and mixing the slurry. There is an effect that the degree can be improved.

  In the slurry injection apparatus according to the present invention, the control means includes variable means for changing a partial cross-sectional area of the pipe.

  Thus, in the slurry injection apparatus according to the present invention, since it has variable means for changing the cross-sectional area of a part of the piping, it is possible to pulsate the slurry and improve the degree of diffusion and mixing of the slurry. There is an effect that can be.

  In the slurry injection apparatus according to the present invention, the control means includes a compressor, and the ejection speed of the slurry is accelerated by pressure control by the compressor.

  As described above, in the slurry injection device according to the present invention, since the ejection speed of the slurry is accelerated by the pressure control by the compressor, it is possible to improve the degree of slurry diffusion and mixing.

  The slurry injection apparatus according to the present invention includes a heating unit that heats the slurry ejected from the ejection port.

  In the slurry injection apparatus according to the present invention, the heating means heats the slurry with steam.

  As described above, in the slurry injection apparatus according to the present invention, the slurry ejected from the ejection port is heated by steam or the like, so that the solidification of the slurry can be promoted to shorten the working time, and the solid ground is formed. And the effect that the quality of ground improvement can be improved is produced.

  In the slurry injection apparatus according to the present invention, the stirrer includes stirring blades at a predetermined interval, and the control unit pulsates the slurry ejection mode corresponding to the stirring operation of the stirring blades. To control.

  As described above, in the slurry injection device according to the present invention, the stirrer includes the stirring blades with a predetermined interval, and the slurry jetting mode is controlled to pulsate corresponding to the stirring operation of the stirring blades. Therefore, there is an effect that the degree of diffusion and mixing of the slurry can be remarkably improved by the synergistic effect of the stirring effect by the stirring blade and the pulsating jet of the slurry.

It is a schematic diagram which shows the structure of the ground improvement system containing the slurry injection apparatus which concerns on 1st Embodiment. It is a figure which shows an example of the squeeze pump in the slurry ejection apparatus which concerns on 1st Embodiment. It is a figure which shows the case where a jet pressure is raised in the slurry jet apparatus which concerns on 1st Embodiment. It is a figure which shows the mode of the pulsation in the case of FIG. 3 with a waveform. It is a schematic diagram which shows the structure of the ground improvement system containing the slurry injection apparatus which concerns on 2nd Embodiment. It is a schematic diagram which shows the structure of the ground improvement system containing the slurry injection apparatus which concerns on 3rd Embodiment. It is a schematic diagram which shows the structure of the ground improvement system containing the slurry injection apparatus which concerns on 4th Embodiment. It is a schematic diagram which shows the structure of the ground improvement system containing the slurry injection apparatus which concerns on 5th Embodiment. It is a functional block diagram of the computer of the slurry ejection apparatus which concerns on 6th Embodiment.

  Embodiments of the present invention will be described below. Also, the same reference numerals are given to the same elements throughout the present embodiment.

(First embodiment of the present invention)
The slurry ejection apparatus according to the present embodiment will be described with reference to FIGS. Drawing 1 is a mimetic diagram showing composition of a ground improvement system containing a slurry injection device concerning this embodiment. FIG. 1A is an overall view of a ground improvement system, and FIG. 1B is an enlarged view of a stirrer in the ground improvement system. The ground improvement system 1 includes a slurry plant 11 that generates slurry, a pump 12 that pumps the generated slurry to the soil that is the target of ground improvement, a flow meter 13 that measures the flow rate of the slurry, and an arm And a heavy machine 14 having a stirrer 16 for stirring the target soil 17.

  The stirrer 16 is replaced with the tip of the arm 15 by removing the bucket of the heavy machine 14, and with the rotation of the motor, the chain having the stirrer blades 18 arranged at predetermined intervals is rotated and the soil 17 is moved. Excavated. A pipe 19 for flowing the slurry pumped from the pump 12 is attached to the side surface of the stirrer 16, and the slurry is ejected downward from the tip of the pipe 19. The ejected slurry is agitated by the rotation of the agitator 16 and mixed with the excavated soil, whereby the soil is improved and a firm ground is formed. At this time, conventionally, the slurry is agitated by accelerating the injection speed of the slurry or widening the jet outlet at a high pressure. However, the slurry may not be sufficiently agitated. Therefore, in the present embodiment, the pump 12 is changed to a squeeze pump so that the slurry ejection mode is unsteady (the state is not constant).

  FIG. 2 is a diagram illustrating an example of a squeeze pump in the slurry ejection device according to the present embodiment. The squeeze pump 20 is provided with a roller 22 in which a tube 21 in which slurry flows is arranged in a U-shape and rotates at the center of the arc. Small rotating bodies are provided at both ends of the roller 22, and the slurry in the tube 21 is sent to the discharge port while the tube 21 is crushed in accordance with the rotation of the roller 22. Due to the mechanism of the squeeze pump 20 and the distance of the flow path to the jet port, the slurry pulsates so that the jet mode undulates at the jet port.

  When the slurry pulsates during ejection, it is possible to promote the diffusion of the slurry and the stirring with the excavated soil, and to improve the quality of ground improvement. It is also possible to increase the diffusion and stirring properties by increasing the pressure of the jet in accordance with the pulsation of the slurry.

  FIG. 3 is a diagram illustrating a case where the ejection pressure is increased in the slurry ejection apparatus according to the present embodiment, and FIG. 4 is a diagram illustrating a state of pulsation at that time in a waveform. In FIG. 3 (A), the pipe 19 is a half-pipe until the middle of the pipe 19, and a pipe through which the slurry is pumped and a pipe through which the air compressed by the compressor 31 circulates are individually provided, and its supply path It is joined in the middle of. FIG. 3B shows an enlarged view of the pipe 19 at the junction. That is, as shown by the dotted line in FIG. 4, the slurry pumped by the squeeze pump 20 is accelerated and ejected by the compressed air of the compressor 31 synchronized with the pulsation timing. The accelerated slurry further enhances diffusion and agitation. In addition, the continuous line in FIG. 4 shows the waveform (the waveform of the pulsation produced by the squeeze pump) when the compressed air by the compressor 30 is not sent.

  As described above, the slurry ejection device according to the present embodiment controls the ejection mode of the slurry to an unsteady state where the state is not constant but fluctuates, such as pulsation, by pumping the slurry with a squeeze pump. Due to the fluctuation, the slurry can be diffused widely in the soil and stirred so as to be sufficiently mixed. Moreover, by sending compressed air with a compressor etc. according to a pulsation, the ejection of a slurry can be accelerated and the spreading | diffusion and stirring property of a slurry can be improved further.

(Second embodiment of the present invention)
The slurry ejection apparatus according to this embodiment will be described with reference to FIG. The slurry ejection device according to the present embodiment pulsates the ejection of slurry by controlling the size of the cross-sectional area of a pipe through which the slurry is pumped. FIG. 5 is a schematic diagram illustrating a configuration of a ground improvement system including the slurry injection device according to the present embodiment. 5A is an overall view of the ground improvement system, FIG. 5B is a first diagram showing a mechanism for controlling the injection of slurry, and FIG. 5C is a mechanism for controlling the injection of slurry. FIG.

  In FIG. 5A, the overall structure of the ground improvement system is the same as that of the first embodiment, but the pump 12 does not have to be a squeeze pump, and the slurry is pumped in a constant state (steady state). It may be. And by having the mechanism which makes variable the cross-sectional area of the piping 19 as shown in FIG.5 (B) or FIG.5 (C) in the middle of the piping 19, it controls so that the ejection aspect of a slurry may pulsate.

  In FIG. 5B, the flexible pipe 19 is partially crushed by the eccentric rotating body 50, thereby changing the cross-sectional area of the pipe 19. That is, a pressure difference is generated in the slurry flowing through the pipe 19 according to the size of the cross-sectional area of the pipe 19, and the slurry ejection mode pulsates according to the pressure difference. The rotating body 50 may have a substantially triangular shape as shown in FIG. 5B, or may have an elliptical shape or a rectangular shape. The shape and shape of the pulsation (ejection amount) can be varied by changing the shape and shape of the pulsations (for example, triangles and rectangles with different lengths on the three sides). It is possible to eject the slurry with added. Further, it is possible to change the period and magnitude of pulsation by changing the rotation speed of the rotating body 50.

  FIG. 5C has a cylinder 51 branched in the middle of the pipe 19, and varies the cross-sectional area of the pipe 19 according to the movement of the piston 52. In this case as well, as in the case of FIG. 5B, the cycle and magnitude of the pulsation can be changed by adjusting the operation speed and the movement amount of the piston 52.

  5B and 5C may be disposed closer to the slurry plant 11 as indicated by the broken line in FIG. 5A, or the tip of the arm of the heavy machine 14 It may be arranged on the side. When it is arranged closer to the slurry plant 11, it is easy to secure a power source, and the operations of the rotating body 50 and the piston 52 can be flexibly controlled with electric energy. On the other hand, when the heavy machine 14 is disposed on the distal end side of the arm, it is not necessary to secure a power source by interlocking with the hydraulic pump provided in the heavy machine 14 that drives the motor of the stirrer 16. The pulsation can be controlled in synchronization with the rotational drive of the machine 16. Further, since the pulsation is generated from a position close to the tip of the pipe 19, the influence of the vibration of the pipe 19 due to the pulsation of the slurry can be minimized.

(Third embodiment of the present invention)
The slurry ejection apparatus according to this embodiment will be described with reference to FIG. The slurry ejection device according to the present embodiment has a branch pipe that branches and merges into a part of a pipe through which slurry is pumped, and pulsates the ejection of slurry using a pressure difference between the pipe and the branch pipe. is there. FIG. 6 is a schematic diagram showing a configuration of a ground improvement system including the slurry injection device according to the present embodiment. FIG. 6A is an overall view of the ground improvement system, and FIG. 6B is a diagram showing a mechanism for controlling slurry injection.

  In FIG. 6A, the overall configuration of the ground improvement system is the same as that of the second embodiment. In the present embodiment, by having a mechanism in which the pipe 19 is branched in the middle of the pipe 19 as shown in FIG. The mechanism shown in FIG. 6B does not require a power source or the like and has the structure of the pipe 19 itself. Therefore, as shown in the broken line in FIG. 6A, the mechanism is arranged in a region near the slurry outlet. It becomes possible. That is, since the pulsation is generated from a position close to the tip (jet port) of the pipe 19, the influence of the vibration of the pipe 19 due to the pulsation of the slurry can be minimized.

  In FIG. 6B, the slurry is pumped from above (upstream) to below (downstream). A branch pipe 60 is branched from the middle of the pipe 19, and the branch pipe 60 is joined again to the pipe 19 on the downstream side of the branch position. At this time, assuming that the upstream cross-sectional area of the pipe 19 is S1, the downstream cross-sectional area of the pipe 19 is S2, the upstream cross-sectional area of the branch pipe 60 is S3, and the downstream cross-sectional area of the branch pipe 60 is S4. , S1> S2> S3> S4 is most preferable. That is, by making the cross-sectional area of the branch pipe 60 smaller than the cross-sectional area of the pipe 19, a pressure difference between the pipe 19 and the branch pipe 60 is generated to pulsate the slurry ejection. Furthermore, by reducing the cross-sectional area on the downstream side compared to the upstream side, the pressure can be increased and the ejection of slurry can be accelerated.

  Thus, the pulsation and acceleration of the slurry ejection can enhance the diffusion of the slurry and the agitation with the soil, and the quality of the ground improvement can be improved.

(Fourth embodiment of the present invention)
The slurry ejection apparatus according to this embodiment will be described with reference to FIG. The slurry ejection device according to the present embodiment has a mechanism for generating a vacuum in a pipe through which the slurry is pumped, and draws the slurry in a vacuum state to pulsate the ejection. FIG. 7 is a schematic diagram showing a configuration of a ground improvement system including the slurry injection device according to the present embodiment. FIG. 7A is an overall view of the ground improvement system, and FIG. 7B is a diagram showing a mechanism for controlling slurry injection.

  In FIG. 7A, the overall structure of the ground improvement system is the same as that of the third embodiment. In the present embodiment, by providing a vacuum generation unit 70 as shown in FIG. 7B in the middle of the pipe 19, control is performed so as to generate a vacuum and pulsate the slurry ejection mode. Since the mechanism shown in FIG. 7B does not require a power source or the like and can be installed directly on the pipe 19, it is arranged near the slurry outlet as shown by the broken line in FIG. Can be installed. That is, since the pulsation is generated from a position close to the tip (jet port) of the pipe 19, the influence of the vibration of the pipe 19 due to the pulsation of the slurry can be minimized.

  In FIG. 7B, the slurry is pumped from above (upstream) to below (downstream). In the present embodiment, the pipe 19 is bent instead of a straight line, and the vacuum generation unit 70 is joined to the bent position. That is, the fluidity of the slurry is prevented from being disturbed while securing a region for generating a vacuum.

  In the vacuum generator 70, the compressed air is squeezed and injected by the nozzle 71 (in the case of FIG. 7B, it is injected leftward). The pressure is reduced by the jetting to generate a vacuum state, and the slurry that is pumped from above to below (obliquely below) is drawn by the generated vacuum. By periodically generating a vacuum state, the slurry can be drawn accordingly and create pulsations. It should be noted that the pulsation cycle can be freely changed in accordance with the control of the vacuum generation state (that is, the control for sending the compressed air to the nozzle 71).

  Thus, the slurry pulsation can increase the diffusion of the slurry and the agitation with the soil, thereby improving the quality of the ground improvement.

(Fifth embodiment of the present invention)
The slurry ejection apparatus according to this embodiment will be described with reference to FIG. The slurry ejection device according to the present embodiment includes a heating unit that heats the slurry when the slurry is ejected from the ejection port, thereby promoting solidification of the slurry and forming a solid ground. FIG. 8 is a schematic diagram showing the configuration of the ground improvement system including the slurry injection device according to the present embodiment. FIG. 8A is an overall view of the ground improvement system, and FIG. 8B is a diagram showing a slurry injection mechanism.

  In FIG. 8A, the overall structure of the ground improvement system is partially different from that of the fourth embodiment, and includes heating means for heating the slurry to be ejected at the ejection port. As a heating method, it is possible to directly heat the slurry outlet in the pipe 19 with a heat source such as a heater, but since the slurry may be fixed in the pipe 19, it is heated after the ejection. Is desirable. That is, as shown in FIG. 8, a water pipe 80 for circulating water from the water storage tank 83 is separately routed by a double pipe, and a heat source 81 such as a heater is provided at the tip of the water pipe 80 and discharged. The water is vaporized, and the slurry ejected from the vaporized water is heated. By doing so, it is possible to heat only the slurry without heating the pipe 19.

  The water sucked up from the water storage tank may be once heated with a boiler or the like and then circulated in the water pipe 80. By doing so, it becomes easy to evaporate.

  In this way, by heating the ejected slurry, it is possible to realize formation of a strong ground without fixing the slurry in the pipe 19.

(Sixth embodiment of the present invention)
The slurry ejection apparatus according to this embodiment will be described with reference to FIG. The slurry ejection device according to the present embodiment performs slurry diffusion and stirring more effectively by associating and controlling the rotation operation of the stirrer and the pulsation operation of the slurry. FIG. 9 is a functional block diagram of a computer of the slurry ejection device according to the present embodiment.

  The computer 90 of the slurry ejection device according to the present embodiment performs operation input from a user (for example, a pilot or the like of a heavy machine 14 that performs ground improvement) and data (for example, ground improvement) prepared in advance. The input area 91 for receiving input of the area to be processed, the required flow rate of the slurry, the moisture content of the slurry, etc., and the conditions and setting information necessary for the control processing stored in the input information and the control information storage section 94 Based on the squeeze pump 20, the compressor 31, the cross-sectional area control mechanism of the piping 19, the pulsation control unit 92 that controls the generation of vacuum, and the information and control input by the input unit 91 described in the above embodiments. And a stirring control unit 93 that controls the operation of the stirrer 16 based on conditions and setting information necessary for control processing stored in the information storage unit 94, and controls pulsation. 92 and stirring control unit 93 and is interlocked to perform the calculation of the control.

  That is, for example, the ejection of slurry is pulsated in synchronization with the stirring blade 18 of the stirrer 16. Specifically, the pulsation control unit 92 controls the pulsation so that the slurry ejection pressure increases (becomes a peak value in a pulsation waveform) immediately after the stirring blade 18 passes through the slurry ejection port. By doing so, a slurry can be injected | thrown-in with respect to the state immediately after the stirring blade 18 excavated the ground, and stirring property can be improved. Also, for example, by controlling each stirring blade 18 so that the pulsation reaches a peak in the middle of passing through the slurry ejection port, the stirring blade 18 and the effect of diffusion / stirring by the ejection of the slurry Stirability can be improved.

  Such control is performed based on the condition / setting information stored in the control information storage unit 94. For example, a condition that matches the information input to the input unit 91 is extracted from the control information storage unit 94, and each control unit performs a control operation based on the setting information stored therein. Specifically, for example, the soil quality of the ground to be improved is input, the conditions of stirring by the stirrer 16 and the conditions (amount, components, etc.) of the slurry according to the soil quality are extracted. Information on how to link the pulsation of the slurry is extracted, and based on the extracted information, the pulsation control unit 91 and the stirring control unit 93 perform control processing in conjunction with each other.

  In addition, the operation setting of stirring and pulsation should be performed based on conditions such as the amount of slurry required for the ground improvement area, progress of ground improvement, elapsed time, temperature, humidity, etc., in addition to the above-described soil properties. Also good.

  As described above, in each of the above embodiments, the slurry injection device according to the present invention is different from a normal steady state (a state in which there is no change in the injection mode in slurry injection), and is in a non-steady state (for example, pulsation). ), An efficient stirring and mixing operation that is not possible in the past can be obtained.

DESCRIPTION OF SYMBOLS 1 Ground improvement system 11 Plant 12 Pump 13 Flowmeter 14 Heavy machine 15 Arm 16 Stirrer 17 Soil 18 Stirring blade 19 Piping 20 Squeeze pump 21 Tube 22 Roller 31 Compressor 50 Rotating body 51 Cylinder 52 Piston 60 Branch pipe 80 Water piping 81 Heat source 83 Water storage tank 90 Computer 91 Input unit 92 Pulse layer control unit 93 Agitation control unit 94 Control information storage unit

Claims (8)

A soil that has a stirring blade disposed at a predetermined interval on a chain that rotates as the motor rotates, is attached to the tip of an arm of a heavy machine that performs ground improvement, and is the soil of the ground that is the target when performing the ground improvement A stirrer that stirs in the depth direction ;
A pipe that is provided along the stirrer and pumps slurry to be put into the soil, and
In the supply path through which the slurry is supplied into the soil, the spray control means for controlling the slurry to be pulsated and ejected in a state where the ejection pressure of the slurry is at least larger than 0, and
The agitating blade excavated the ground based on the change in relative position in the depth direction between the jet outlet at the tip of the pipe and the rotating agitating blade that is accompanied by the agitating operation of the agitating blade. A slurry injection apparatus, wherein control is performed so that the pulsation reaches a peak in the state immediately after or when the stirring blade passes through the slurry outlet. In the slurry injection apparatus according to claim 1,
The slurry injection apparatus, wherein the ejection control means has a squeeze pump, and controls the operation of a rotating roller in the squeeze pump to pulsate the ejection of the slurry. In the slurry injection apparatus according to claim 1 or 2,
The slurry ejection device, wherein the ejection control means has a branch pipe that branches a part of the pipe and joins the pipe again . In the slurry injection apparatus in any one of Claim 1 thru | or 3 ,
The slurry ejection device, wherein the ejection control unit includes a vacuum generation unit that evacuates a part of the pipe, and pulsates the ejection of the slurry by controlling the generation state of the vacuum . In the slurry injection apparatus in any one of Claims 1 thru | or 4,
The slurry ejection device, wherein the ejection control means has variable means for varying a partial cross-sectional area of the pipe. In the slurry injection apparatus in any one of Claim 1 thru | or 5,
The slurry injection apparatus, wherein the ejection control means includes a compressor, and the ejection speed of the slurry is accelerated by pressure control by the compressor . In the slurry injection apparatus in any one of Claim 1 thru | or 6,
A slurry injection apparatus comprising heating means for heating the slurry ejected from the ejection port . In the slurry injection device according to claim 7 ,
The slurry injection apparatus , wherein the heating means heats the slurry with steam .

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