JP2012122291A - Force-feed method of cement fluid material and device thereof, and spray method of cement-based mixture and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a force-feed method of cement fluid material and a device thereof, and a spray method of cement-based mixture and a device thereof, capable of effectively preventing the deposition of sludge in a pipe during force-feeding of a cement fluid material.SOLUTION: A force-feed pump 18 for force-feeding a cement fluid material including at least cement and water, or piping 21,24 connected to the force-feed pump 18 and having the cement fluid material flowing therein, are vibrated.

Description

This invention, for example, separately pumps aggregate and cement milk to mixing means arranged upstream of the spray nozzle, and applies cement-based mixture such as mortar and concrete formed by the mixing means from the spray nozzle. The present invention relates to a method and apparatus for compressing a cement fluid suitable for use in an operation of spraying an object, and a spraying method and apparatus for a cement-based mixture.
In this specification, a material containing at least water, cement, and aggregate (regardless of whether fine aggregate or coarse aggregate) is defined as “cement-based mixture”, and includes at least water and cement. These terms are used by defining “cement fluid” and defining “cement milk” as consisting of water, cement, and optionally a cement admixture. That is, “cement fluid” includes both “cement-based mixture” and “cement milk”.

  The present applicant has developed a spraying method of a cement-based mixture (mortar and concrete) that separately pumps aggregate and cement milk, and has already proposed various techniques related to this method (for example, Patent Documents 1 and 2). reference). Compared to the general spraying method in which water, cement, and aggregate are kneaded, and this high-viscosity kneaded material is pumped, this method has a lower pipe resistance and enables long-distance and high-lift pumping. Has the advantage of

Japanese Patent No. 4229260 Japanese Patent Laid-Open No. 2005-155069

  By the way, when performing the above-mentioned spraying method, a phenomenon in which sludge-like substances accumulate in the pipe near the pump for feeding during the pumping of cement milk toward the mixing means may be particularly severe in summer. As a result of confirmation by the present inventors, the substance was not cement solidified by a hydration reaction, but was in the form of a clay that was considered to be merely an aggregate of cement fine particles in cement milk. From this, it is considered that if any condition overlaps during the pumping of the cement milk, the sludge of the cement gradually settles and accumulates in the pipe, but the condition is still unknown.

  On the other hand, if the above-mentioned accumulation phenomenon is left untreated, the flow path in the pipe will be narrowed, and eventually the pumping flow rate of cement milk will not reach a constant value or the pipe will be blocked. Because there is a fear, it can never be neglected. In addition, cleaning in the tube for removing the accumulated sludge is extremely complicated. The above phenomenon is considered to occur not only during the pumping of the cement milk but also during the pumping of the cement fluid.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a cement fluid pumping method and apparatus capable of effectively preventing sludge accumulation in a pipe during cement fluid pumping, and an apparatus thereof. It is an object of the present invention to provide a method for spraying a cement-based mixture and an apparatus therefor.

  In order to achieve the above object, a method of pumping a cement fluid according to the present invention includes a pump for pumping a cement fluid containing at least cement and water, or the cement fluid connected to the pump for pumping. The piping flowing inside is vibrated (Claim 1).

  In order to achieve the above object, the cement-based mixture spraying method according to the present invention is a cement-based mixture in which aggregate and cement milk not containing cement are separately pumped from their respective sources and mixed. A cement-based mixture spraying method for spraying the cement-based mixture, wherein the cement-fluid pumping method according to claim 1 is used for pumping the cement milk in a supply source. Item 2).

  On the other hand, in order to achieve the above object, a cement fluid pumping device according to the present invention includes a pump for pumping a cement fluid containing at least cement and water, and the cement pump connected to the pump for pumping. A pipe through which a fluid flows is provided, and a vibration pump that vibrates the pump for pumping or the pipe (Claim 3).

  In order to achieve the above object, a cement-based mixture spraying apparatus according to the present invention includes an aggregate pumping machine for pumping an aggregate containing no cement, and pumping cement milk separately from the aggregate. A cement fluid pumping device according to claim 3, a mixing means for mixing the aggregate and the cement milk, and a spray nozzle for spraying a cement-based mixture obtained by the mixing means ( Claim 4).

  In the inventions according to claims 1 to 4, a cement fluid pressure-feeding method and apparatus capable of effectively preventing sludge accumulation in the pipe during cement fluid pressure-feeding, and a cement-based mixture spraying method and That device is obtained.

  That is, in the invention according to claims 1 to 4, a pump for pumping cement fluid or a pipe connected to the pump for pumping the cement fluid is vibrated inside. Sludge accumulation is effectively prevented. The mechanism for preventing sludge accumulation by such a configuration is not yet elucidated, but the above-mentioned vibration causes the cement fine particles to be settled to wind up and ride on the flow toward the downstream side of the cement fluid. It is thought that.

  And, in the inventions according to claims 1 to 4, since the accumulation of sludge is prevented when the cement fluid is pumped, the number and time of pipe cleaning that has been performed regularly in the past can be reduced and eventually eliminated. Therefore, the labor for cleaning is reduced, which leads to improvement of construction efficiency.

  Moreover, since the invention concerning Claims 1-4 can maintain the flow volume and the density | concentration of the cement fluid which are pumped constant, it contributes also to ensuring and improvement of construction quality.

  Furthermore, the invention which concerns on Claims 1-4 also has the following effects. That is, if the pipe is blocked by sludge, spraying must be stopped and the sludge removed, and if clogging occurs in other parts of the pipe during this time, the clogged portion is identified and clogged (pumped) Capacity recovery work) is also required. And in the above-mentioned spraying method proposed by the present applicant, while it is possible to spray over a very long distance, when performing such spraying, a long pipe (hose) is used, and the construction place is in Yamanaka. If this is the case, it will take a considerable amount of time to reach the clogged area, and if the clogging work must be performed on a steep slope, it will not be a waste of time, but it will raise the problem that the worker will be at risk. . However, according to the inventions according to claims 1 to 4, since there is no possibility that the inside of the pipe is completely blocked by the sludge, the 1 or 2 times of the in-pipe cleaning is immediately performed for restoring the pumping ability. It will not lead to major problems such as construction being delayed for more than a whole day or the life of the worker being at risk, but the workability and safety will be improved. It is also possible to continuously carry out the pumping of the cement fluid without providing a cleaning time in the middle of the day.

BRIEF DESCRIPTION OF THE DRAWINGS It is whole structure explanatory drawing which shows schematically the structure of the spraying method of the cementitious mixture which concerns on one embodiment of this invention, and its apparatus. It is principal part structure explanatory drawing which shows the structure of the said apparatus roughly. It is a principal part front view which shows the structure of the said apparatus roughly.

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

  The cement-based mixture spraying method (hereinafter abbreviated as spraying method) according to the present embodiment includes an aggregate (sand in this example) 2 supplied from an aggregate pump 1 as shown in FIG. This is to form the method frame 6 by spraying the cement-based mixture 5 obtained by mixing the water 3 and the cement milk pumped by the cement fluid pumping device 4 onto the slope N.

  Specifically, a net 7 such as a wire mesh is stretched on the slope N, and reinforcing bars 8 are arranged on the net 7 in a lattice shape to form a normal frame spraying portion. On the other hand, the curing sheet 9 is disposed, and the cementitious mixture 5 is sprayed so as to cover the grid-like reinforcing bars 8 to form the grid-like method frame 6, and then the curing sheet 9 is peeled off, and plant seeds and fertilizer are applied. The vegetation base material 10 to be included is sprayed onto the frame 6 to protect the greening of the slope N.

  In this embodiment, the cement-based mixture 5 is a mortar material in which cement, sand as fine aggregate, and water are mixed (usually the weight ratio is cement: sand: water = 1: 4: 0). However, the present invention is a concrete in which cement, sand as fine aggregate, gravel, gravel and crushed stone as coarse aggregate, and water are mixed. The present invention is also applicable when the material is used as the cement-based mixture 5.

  And the spraying method of this embodiment can be performed using the spray apparatus (henceforth a spraying apparatus) of the cementitious mixture shown in FIG.

  This spraying apparatus is connected to an air compressor 11 that supplies compressed air, and is an aggregate pumping machine (supplying aggregate 2 and water 3) for pumping the aggregate 2 and water 3 not containing cement (cement milk). A source) 1 and a cement fluid pumping device 4 for pumping cement milk separately from the aggregate 2 and the water 3 are provided. Then, the aggregate 2 and water 3 are supplied from the aggregate pressure feeder 1 to a portable mixing device 13 as a mixing means via a pipe (hose) 12, and the pipe (hose) is supplied from the cement fluid pressure feeding device 4. Cement milk is supplied to the mixing device 13 via 14. The aggregate 2, water 3 and cement milk supplied to the mixing device 13 are mixed and then sprayed from the spray nozzle 16 through the pipe (hose) 15 so as to cover the reinforcing bar 8 as the cement-based mixture 5.

  Next, the configuration of the cement fluid pressure feeding device 4 of the present embodiment that effectively prevents sludge accumulation will be described with reference to FIGS.

  As shown in FIG. 2, the cement fluid pressure feeding device 4 includes a mixer 17 having a stirring blade 17 a. The mixer 17 is supplied with cement, water, and a cement admixture as necessary. After being mixed and made into cement milk, it is sent to a pump 18 for pressure feeding through a pipe. That is, the mixer 17 is a supply source of cement milk.

  Here, in the present embodiment, two mixers 17 are provided, and the pipes 19 inserted and arranged in the two mixers 17 are connected to a three-way electromagnetic valve 20 as a flow path switching means. An introduction pipe 21 connected to the downstream side is connected to the pump 18 for pressure feeding. Therefore, while the cement milk in one mixer 17 is sucked into the pump 18 for pumping, the cement milk can be kneaded in the other mixer 17, and the three-way solenoid valve 20 can be switched appropriately. Cement milk can be continuously supplied.

  As shown in FIG. 2, the pumping pump 18 elastically deforms the pumping tube 23 by the rotation of the rotor 22, and sucks the conveyed object (cement milk in this example) into the pumping tube 23. A squeeze pump that discharges the sucked object from the pumping tube 23 is used.

  The piping 24 connected to the downstream side of the pump 18 for pumping is provided with an air chamber 25 (see FIG. 3), and the cement milk delivered from the pump for pumping 18 absorbs and reduces pulsation by the air chamber 25. Then, it is pumped at a constant flow rate toward the mixing device 13. 2 and 3, reference numeral 26 denotes a pressure gauge. The pipe 24 extends substantially linearly from at least a portion (upstream end) connected to the pump 18 for pumping to a portion where the air chamber 25 is provided.

  In the conventional cement fluid pressure feeding device, the sludge accumulation phenomenon is particularly severe in the summer in the relatively upstream region (particularly immediately after the air chamber 25) in the pipe 24 connected to the downstream side of the pressure pump 18. In this embodiment, in order to prevent the accumulation of sludge, a vibration generator 30 as a vibration means is attached to the pipe 24 to constantly vibrate the pipe 24 (see FIGS. 2 and 3). .

  That is, the vibration generator 30 generates vibration by electric or pneumatic operation and applies this vibration to the pipe 24. For example, the vibration generator 30 generates a high frequency of about 300 to 400 kHz from a low frequency of about 20 to 30 kHz. Low frequency or high frequency generator (vibrator), ultrasonic transmitter, etc.

  In the present embodiment, in addition to the vibration of the pipe 24, in order to prevent sludge accumulation, the pump for pumping 18 and the pipe 24 connected to the pump for pumping 18 are cooled. That is, as shown in FIGS. 2 and 3, the lower part of the pump 18 for pumping and the pipe 24 (cooling part) are arranged in the water tank 27, and the pump 18 for pumping and the pipe 24 are connected by water supplied into the water tank 27. Cooling. In the present embodiment, water is continuously supplied from the water supply pipe 28 into the water tank 27, and the water that does not fit in the water tank 27 overflows. The water tank 27 is provided with a through hole through which the pipe 24 is inserted, and a seal member 29 (see FIG. 3) is interposed between the inner edge of the through hole and the pipe 24. The water tank 27 may have a tank (chamber) for housing the pump 18 for pumping and a tank (chamber) for housing the pipe 24, and only one of them may be provided, but at least the pipe 24 is cooled. Is desirable.

  And the water (room temperature water or cold water) whose temperature is 5 degreeC-25 degreeC is supplied from the water supply pipe | tube 28 so that the lower part of the pump 18 for pumping and the piping 24 (cooling site | part) may be 5 degreeC-25 degreeC. . The cooling temperature is 5 ° C to 25 ° C. If the temperature is lower than 5 ° C, the setting time of the cement milk will be long, which is disadvantageous for the construction. This is because an excessive increase in the curing rate or an excessive decrease in the viscosity may cause a problem.

  The present inventors have confirmed that sludge accumulation is effectively prevented by vibrating the pipe 24 and cooling the pumping pump 18 and the pipe 24 as described above. The mechanism by which sludge accumulation is prevented by such a configuration has not been elucidated. However, when the pipe 24 is vibrated, cement fine particles to be settled are wound up and ride on the flow toward the downstream side of the cement milk. Also, it is considered that cooling the pump 18 for pumping increases the viscosity of the cement milk and prevents sedimentation of the cement fine particles.

  According to this embodiment, accumulation of sludge is prevented when pumping cement milk, so the number and time of pipe cleaning that has been performed regularly in the past can be reduced and eventually eliminated. The labor is reduced, which leads to an improvement in construction efficiency. In other words, the daily work at the construction site begins with preparation and ends with cleaning up, but usually the working hours of the day are limited, and the actual working time that directly contributes to the progress of construction is determined from the working hours to the preparation. Subtract the time spent cleaning up. Therefore, if the time required for cleaning (the time spent for cleaning up) is reduced, the actual work time per day is extended, and the construction efficiency is improved. In addition, in general construction sites, preparation and tidying are performed in the morning and afternoon, respectively, with a lunch break, whereas the conventional tidying time was about 30 to 60 minutes each in the morning and afternoon, Since the cleaning time required in the present embodiment is 15 to 30 minutes or less, the actual work time per day can be extended by 30 minutes or more.

  According to the present embodiment, the flow rate and concentration of the pumped cement milk can be kept constant, so that the quality of construction can be ensured.

  Furthermore, according to the present embodiment, there is no possibility that the inside of the pipe is completely blocked by the sludge. This does not lead to major problems such as delays or the life of workers being exposed to danger. This also improves workability and safety. It is also possible to carry out the continuous operation of the cement milk pressure feeding device 4 without providing the.

  In addition, this invention is not limited to said embodiment at all, Of course, it can change and implement variously in the range which does not deviate from the summary of this invention. For example, the following modifications can be given.

  In the present embodiment, the vibration is always applied to the pipe 24, but the vibration may be intermittently applied, and the part to which the vibration is applied is not limited to the pipe 24, and the pump for pumping 18 or the upstream side thereof. The piping 21 etc. may be sufficient.

  In the present embodiment, the vibration generating device 30 is used as the vibration means. However, the present invention is not limited to this. For example, high-pressure water or ice blast is jetted from the nozzle toward the pipe 24 or the like as a jet water flow, and A jet water jetting device that vibrates etc. may be used.

  In the present embodiment, water for cooling the pump 18 for pumping and the pipe 24 is continuously supplied to the water tank 27, but may be supplied intermittently. Further, the cooling part is not limited to the lower part of the pump 18 for pumping and the pipe 24 but may be another part of the pump 18 for pumping or the pipe 21 connected to the upstream side of the pump 18 for pumping. Further, as the cooling means, in addition to water, a liquid other than water, a solid such as ice / dry ice, a cooling gas, or the like can be used.

  Also, when cooling a pipe such as the pipes 21 and 24, for example, a jacket is attached to the outside of the pipe to form a double pipe structure, and cooling water or the like is allowed to flow between the pipe and the jacket. Also good. Alternatively, the space between the pipe and the jacket in the double pipe structure may be kept in a vacuum state to have a heat insulating structure. In this case, the water supplied to the mixer 17 to form cement milk. If the water is made cold water, the cooling action by this cold water will be fully exhibited.

  Alternatively, the pumping pump 18 and the pipes 21 and 24 may not be cooled and only vibration may be applied.

  In this embodiment, a squeeze pump is used as the pump 18 for pumping, but the present invention is not limited to this, and other pumps such as a piston pump may be used.

  In this embodiment, the cement fluid pressure feeding device 4 constitutes the spraying device, and the cement fluid feeding device 4 uses cement milk as a pumping target. However, the present invention is not limited to this. For example, cement fluid pressure feeding The pumping target of the device 4 may be a cement fluid containing cement, water, and fine aggregate.

  Needless to say, the above-described modifications may be appropriately combined.

18 Pump for pressure feeding 21 Piping 24 Piping

Claims (4)

  A pumping method for pumping a cement fluid containing at least cement and water, or a pumping method for a cement fluid that is connected to the pump for pumping and vibrates a pipe through which the cement fluid flows.   This is a cement-based mixture spraying method in which aggregates and cement milk that do not contain cement are separately pumped from their respective sources, mixed together to obtain a cement-based mixture, and spraying the cement-based mixture. A cement-based mixture spraying method using the cement fluid pressure-feeding method according to claim 1 for pressure-feeding the cement milk in a supply source.   A pump for pumping a cement fluid containing at least cement and water; a pipe connected to the pump for flowing the cement fluid; and an excitation means for vibrating the pump or the pipe And a cement fluid pumping device.   4. An aggregate pumping machine for pumping aggregate not containing cement, a cement fluid pumping apparatus according to claim 3 for pumping cement milk separately from the aggregate, the aggregate and the cement A cement-based mixture spraying device, comprising: mixing means for mixing milk; and a spray nozzle for spraying the cement-based mixture obtained by the mixing means.

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