JPH0734793A - Rapid hardening concrete manufacturing method and pouring method and pouring equipment - Google Patents

Abstract

(57) [Summary] [Purpose] A liquid quick-setting admixture and its retarder are properly mixed, and the effect start time of the quick-setting admixture can be freely adjusted according to the concrete pouring timing and the situation at the pouring site. Can be adjusted,
It is possible to select the concrete pouring mode according to the situation at the pouring site, etc., and moreover, when the pouring is stopped, it is possible to discharge and wash the rapid hardening concrete etc. remaining in the admixture addition device, the pressure feed pipe and the nozzle. To do. [Structure] A method for producing a quick-hardening concrete in which fresh concrete and an accelerator are mixed to adjust the setting time. A liquid quick-setting agent, a retarder, and fresh concrete are prepared so as to be in contact with and immiscible with each other, and these required amounts are mixed at the time of pouring concrete.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention appropriately mixes a liquid quick-setting admixture and a retarder thereof so that the effect start time of the quick-setting admixture can be freely adjusted according to the concrete driving conditions, and The present invention relates to a method for producing rapid-hardening concrete, a method for placing concrete, and an apparatus for placing the concrete, which enables selection of a manner of placing the concrete and allows the rapid-hardening concrete in the pressure pipe to be discharged and washed when the placing is stopped.

[0002]

BACKGROUND OF THE INVENTION For example, sprayed concrete has been conventionally used as a primary lining method for tunnels. In the case of a wet type, this sprayed concrete is generally a mixture of cement, aggregate and water (hereinafter referred to as fresh concrete) that is pressure-fed to a nozzle via a spraying machine, and a required amount of powder is supplied during this pressure-feeding. A quick-setting admixture is added by air pressure, and these are sprayed from the nozzle onto the tunnel excavation surface.

However, the shotcrete concrete method has a problem in that the loss of concrete due to the rebound of concrete is large and the economical efficiency is lacking. In order to solve such a problem, the Applicant has arranged a belt formwork capable of circumferential rotation so as to face the inner circumferential surface of the tunnel, and forms a concrete-filled space between the inner circumferential surface and the formwork. We have developed a concrete wall forming method and its forming device in tunnel construction in which concrete is filled and hardened to such an extent that the concrete can be self-held, and then the formwork is moved in the circumferential direction of the tunnel. It has already been proposed as HEI 2-26040 and JP-B 3-58440.

In the conventional method and apparatus, in the case of producing so-called rapid hardening concrete in which the setting time of concrete is adjusted, the concrete and the quick setting agent are mixed and stirred by using compressed air. In this case, there are powdery and liquid quick-setting agents, but when using powdery ones, it is essential to send by compressed air and mixing and stirring, and when using liquid ones. Had to use compressed air because there was no reliable mixing and stirring device.

Therefore, it is necessary to use compressed air in the conventional apparatus for producing rapid-hardening concrete, and when the rapidly-hardening concrete produced in this way is ejected from the nozzle, the concrete is separated and dust is generated. Then, there was a problem that the strength of the concrete is lowered and the working environment is deteriorated.

In view of such a point, the applicant has developed a mixing device capable of mixing the quick-setting admixture with concrete without using compressed air, and has already proposed it as Japanese Patent Application No. 3-256504. .

On the other hand, in the conventional method and apparatus for producing rapid-hardening concrete, the powdery quick-setting agent is used as described above, and the required amount of the quick-setting concrete is compressed air according to the placing condition and state of the concrete. Even when it is pumped and added to concrete, and when it is used in combination with a retarder, the required amounts of the quick-setting agent and the retarder are premixed and then added to the concrete for use.

However, in such a method for producing quick-hardening concrete, since a quick-setting agent and a retarding agent in a fixed amount are added to the concrete, the setting time of the concrete is constant and there is no flexibility, and the concrete is poured. Conditions and placement method,
It was difficult to set the concrete setting time suitable for the working conditions. In this case, prepare and add a quick-setting agent and a retarder, which have different formulations depending on the degree of placing concrete,
It is troublesome, irrational, and poor in workability to make various kinds of rapid-hardening concrete. In addition, as for the concrete pouring method, a uniform method such as spraying cannot perform proper pouring according to the pouring site, and there is a risk that the strength of the concrete will deteriorate and the appearance of the pouring surface will be poor. there were.

[0009]

In view of the above, the present invention uses a liquid quick-setting agent and a retarder thereof separately,
Depending on the concrete pouring conditions, etc., the required amount can be properly mixed without using compressed air, and the effect start time of the quick-setting admixture can be adjusted freely, and the concrete pouring conditions and working conditions can be adjusted. Depending on the method, you can select the method of placing the quick-hardening concrete, and you can plan the automation of the addition operation of the quick-setting agent and the retarder.
It is an object of the present invention to provide a rapid concrete manufacturing method, a pouring method, and a pouring apparatus capable of discharging and cleaning the concrete.

[0010]

Therefore, the method for producing a quick-hardening concrete of the present invention is a method for producing a quick-hardening concrete in which a setting time is adjusted by mixing fresh concrete and a quick-setting agent. Quick-setting and delay agents,
And fresh concrete so as not to be in contact with each other and immiscible with each other, and by mixing the required amounts of the liquid quick-setting agent, retarder and fresh concrete at the time of placing concrete, It is characterized by having a margin. Also,
The method for producing a quick-hardening concrete of the present invention is a method of producing a quick-hardening concrete in which fresh concrete and a quick-setting agent are mixed to adjust the setting time of the concrete, and the quick-setting agent and the retarder are poured into the concrete. It is characterized in that it is possible to obtain a quick-hardening concrete in which the amount is adjusted according to the conditions and the working conditions, and this is mixed at the time of placing the concrete so that the setting time of the concrete can be finely set. The method for placing rapid-hardening concrete of the present invention is to produce rapid-hardening concrete in which fresh concrete and a quick-setting agent are mixed to adjust the setting time, and the concrete is guided to a nozzle capable of supplying compressed air. In the method of placing rapid-hardening concrete to discharge the rapid-hardening concrete from, while mixing the liquid quick-setting agent and the retarder at the time of placing the concrete, depending on the situation and working conditions of the concrete placing site, The feature of the present invention is that the necessity of compressed air to the nozzle and the air pressure are selectively adjusted to enable the selection of the discharge mode of the rapid hardening concrete from the nozzle. The rapid-hardening concrete pouring device of the present invention comprises a feed pump for separately pumping the required amounts of a liquid quick-setting agent and a retarder, a concrete pump for feeding the required amount of fresh concrete, and these liquid quick-settings. A mixer for mixing the agent, the retarder and the fresh concrete, and a controller for controlling the operation of each of the pumps and for sequence control of the supply of the liquid quick setting agent and the fresh concrete, and the quick setting agent and the delaying agent. It is characterized in that it is possible to automate the placement of rapid-hardening concrete that is mixed with and. The quick-hardening concrete placing device of the present invention is
A feed pump that separately feeds required amounts of a liquid quick-setting agent and a retarder, a mixer that mixes a liquid quick-setting agent, a retarder, and fresh concrete, and an admixture between these feed pump and mixer. An addition device is provided, the addition device is provided with a pair of flow passages communicating with the feed pump and the mixer, and a switching valve for connecting and disconnecting the feed pump is provided in the flow passage, while a water supply source is provided for the admixture addition device. And a pair of flow paths communicating with the air supply source, and a switching valve that selectively connects or disconnects the water supply source and the air supply source is provided at the intersection of these flow paths. It is provided so as to be able to conduct electricity through a passage provided inside, and at least when concrete pouring is stopped, pressurized water and compressed air are made to flow through the admixture adding device, and this is sent from the mixer to the nozzle under pressure to cause rapid hardening concrete. When the concrete pouring is stopped, the admixture addition device, the rapid hardening concrete remaining in the pressure feed pipe and the nozzle, etc. are washed and discharged, so that the good use condition can be obtained at the next use. It has a feature.

[0011]

[Function] A liquid retarder is prepared separately from the liquid accelerator, and the liquid accelerator after preparation, the retarder, and fresh concrete are prepared so as to be in contact with each other and incapable of mixing.
The required amounts of these liquid quick-setting agent, retarder and concrete are mixed at the time of pouring concrete to prevent the setting of quick-hardening concrete before concrete pouring, and the margin of the period of use of the concrete can be obtained. . The quick-setting agent and the retarder are weighed according to the concrete pouring conditions and working conditions, and the liquid quick-setting agent and the retarder are mixed at the time of pouring the concrete, depending on the concrete pouring conditions and the like. It is possible to obtain quick-hardening concrete whose setting time can be finely set. While mixing the required amounts of liquid quick setting agent and retarder at the time of pouring concrete, the necessity of compressed air for the nozzle and the air pressure are selectively adjusted according to the concrete pouring conditions and working conditions, etc. It is possible to freely select the discharge mode of quick-hardening concrete. Facilitates the automation of the production of liquid quick setting agent and retarding agent, and supplies and mixes them in a predetermined amount, and supplies a predetermined amount of kneaded concrete and mixing of concrete, quick setting agent and delay agent. The process can be sequence-controlled and this can be done automatically. At least when concrete pouring is stopped, pressurized water and compressed air are made to flow through the admixture addition device, the pressure feed pipe, and the nozzle, and the rapid-hardening concrete, quick-setting agent, retarder, etc. remaining inside them are discharged and washed. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 5, reference numeral 1 is a water supply pipe communicating with a water supply source 2, and five water supply conduits 3, 4, 5 are provided in the pipe 1. , 6, 7 are connected.

A manual valve 8 or a solenoid valve 9 is inserted in each of the water supply conduits 3, 4, 5, 6, 7 and a water meter 10 is disposed downstream of the water supply conduit 4 and the metering device 10 is provided. Bowl 10
And a mixer 11 for kneading the quick-setting admixture on the downstream side of the water supply conduit 3.
Is provided.

A predetermined amount of water measured by the water measuring device 10 and a required amount of powdered quick-setting agent supplied from the quick-setting agent feeder 12 are accommodated in the mixer 11, and these are stirred. It is possible to stir at 13.

A mixer 14 for stirring the quick-setting admixture is arranged below the mixer 11 and just below the pipe end portion of the water supply conduit 5. The mixers 11 and 14 communicate with each other via a conduit 15. An agitator 16 is provided inside the mixer 14.

In the vicinity of the mixer 14, for example, a screw type feed pump 1 for feeding a liquid quick-setting agent under pressure.
7 is provided, and a conduit 18 communicating with the mixer 14 is connected to the suction port. A quick-setting agent supply pipe 19 is connected to the discharge port of the feed pump 17, and the pressure gauge 2 is connected to the pipe 19.
0 and the flowmeter 21 are connected to each other, and the admixture adding device 23 is connected to the end of the pipe.

On the other hand, a mixer 24 for kneading the retarding agent is provided downstream of the water supply conduit 6, and a required amount of the retarding agent after measurement and water are contained in the mixer 24, and these are mixed by a stirrer 25. It is possible to stir.

A feed pump 2 of a screw type, for example, for feeding a liquid retarder under pressure is provided near the mixer 24.
6 is provided, and a conduit 27 communicating with the mixer 24 is connected to its suction port.

A delay agent supply pipe 28 is connected to the discharge port of the feed pump 26, and a pressure gauge 29 and a flowmeter 3 are connected to the pipe 28.
0 is connected, and the admixture adding device 23 is connected to the end of the pipe.

The downstream side of the water supply conduit 7 is connected to the suction port of the water supply pump 32, one end of the water injection pipe 33 is connected to the discharge port, and the admixture adding device 23 is connected to the other end side. In the figure, reference numeral 35 is an air compressor which is a pneumatic supply source, and an air supply pipe 36 is connected to the discharge port thereof, and an admixture adding device 23 is connected to the end of the pipe.

Inside the admixture adding device 23, three valve holes 38, 39, 40 are formed in a row in a row, and these are connected to upper and lower two-stage passages formed inside the device 23. The one side peripheral surface of the admixture adding device 23 is provided with a through hole 41 communicating with the water injection pipe 33 and a through hole 42 communicating with the air supply pipe 36, which are formed in the valve hole 38 as shown in FIG. A communication hole 43 that communicates with the quick-setting agent supply pipe 19 and a communication hole 44 that communicates with the delay agent supply pipe 28 are opened on the other side peripheral surface, and these are connected as shown in FIG. The valve holes 39 and 40 communicate with each other on a plane separate from the holes 41 and 42.

On the peripheral surfaces of the through holes 43 and 44 on the opposite side to the opening peripheral surfaces, through holes 45 and 46 communicating with the valve holes 39 and 40 are opened, and an outlet pipe communicating with the admixture injection pipe 47. 48 and 49 are connected.

A passage 50 is formed inside the admixture adding device 23, and the passage 50 communicates with each valve hole 38, 39, 40 through a guide passage 51, 52, 53. In the figure, 54 is a blind plug provided at both ends or one end of each passage 50, 51, 52, 53, and 55 is a valve hole 38, 39, 4
A blind plug (not shown) is plugged with a screw hole formed at the end of 0.

Inside the valve holes 38, 39, 40, three-way switching valves 56, 57, 58 are actuators (not shown).
It is rotatably mounted through the opening to open and close the passage. These switching valves 56, 57, 58 have cylindrical valve bodies 56a, 57a, 58a and rotating spools 56b, 57b, 58b, among which the switching valve 5
7, 58 have the same configuration.

The valve body 56a has a solid shaft shape as shown in FIG. 4, and the valve bodies 57a and 58a have center ports 59 which communicate with the rotary spools 57b and 58b.
60 is formed inside, and the ports 6 communicating with the center ports 59 and 60 are provided on the peripheral surfaces of the bodies 57a and 58a.
1, 62 are formed.

The rotary spool 56b has a center port 63 formed therein, and ports 64a, 64b, 6 communicating with the center port 63 are formed on the peripheral surface of the spool 56b.
4c is formed. Ports 65a, 65b, 65c communicating with the center ports 61, 62 and ports 66a, 66b, 6 are also provided on the peripheral surfaces of the rotary spools 57b, 58b.
6c is formed.

The switching valve 56 closes the guide passage 51 via the rotary spool 56b when pouring hardened concrete, and shuts off the supply of water or compressed air into the passage 50.
At that time, the switching valves 57 and 58 are connected to the rotary spool 57b,
Through each port of 58b, the quick-setting admixture supply pipe 19 is passed through the through hole 4
6 and the delay agent supply pipe 28 through hole 45.
To allow the quick-setting agent and the delay agent to be supplied to the outlet pipes 48, 49.

The switching valve 56 is provided with ports 64a, 6 of the rotary spool 56b when the pouring of the hardened concrete is stopped.
One of 4b communicates with the water injection pipe 33 or the air supply pipe 36, and the corresponding port communicates with the guide passage 51,
Either water or compressed air, in the present example both, can be introduced into the passage 50.

At this time, the switching valves 57 and 58 allow the center ports 59 and 60 to communicate with the passage 50 through the ports 61 and 62 of the valve bodies 57a and 58a, and at the same time, the ports 65b and 66b of the rotary spools 57b and 58b. Water or compressed air is made to communicate with the through holes 45 and 46, and the switching valve 5
It is guided to the inside of 7, 58 and can be discharged to the outlet pipes 48, 49.

The opening / closing operation of each switching valve 56, 57, 58 is performed by the actuator, and the operation of the actuator is controlled by the controller 67. The controller 67 includes the pressure gauges 20 and 29, the solenoid valve 9 and a nozzle opening / closing solenoid valve, which will be described later, and the water meter 1.
0 and each flow meter 21, 30 and quick-setting adhesive feeder 12
, Feed pumps 17, 26, stirrers 13, 16,
25 and a mixer described later, a water supply pump 32, a concrete pump described later, and an air compressor 35.
It is possible to input various signals from etc.

The controller 67 produces and pressure-feeds the quick-setting agent and the delay agent at the time of pouring the hardened concrete, operates the switching valves 56, 57 and 58 in the admixture adding device 23, and pours the hardened concrete. Regarding the discharge and cleaning of the rapidly hardened concrete at the time of stop, the sequence control contents are stored, and a control signal is output to the related equipment based on the control contents to enable execution of the various sequence controls.

For example, regarding the preparation of the quick-setting agent and the retarder at the time of pouring the hardened concrete, the addition of each of the quick-setting agent and the delay agent is made according to the concrete pouring time, the situation of the pouring site and the working conditions. The amount is read from the memory information of various experimental values, and based on this, the required amount of the quick-set admixture and the retarder and the water for mixing them are weighed and mixed and stirred, and the liquid quick-set admixture and the delayed liquid prepared The feed agent is pressure-fed by the feed pumps 17, 26, and the respective pumps 17, 26 at that time are fed.
The discharge amount of is measured.

Further, the operation of the switching valves 56, 57, 58 differs between when pouring of hardened concrete and when pouring is stopped. At the time of pouring, the switching valve 56 is first rotated to make compressed air and pressurized water. Are alternately supplied to the admixture adding device 23, which is guided from the switching valves 57 and 58 to the outlet pipes 48 and 49 to wash away the hardened concrete remaining in the pressure feeding pipe, and then the switching valve 56 is rotated. The introduction of water and compressed air is stopped, and the changeover valves 57 and 58 are rotated to send the liquid quick-setting admixture and retarder to the outlet pipes 48 and 49 to supply them to the mixer.

When pouring of the hardened concrete is stopped, the switching valve 56 is rotated to alternately supply compressed air and pressurized water to the admixture adding device 23, which is supplied from the switching valves 57 and 58 to the outlet pipes 48 and 49. I try to wash away the residue of the rapid hardening concrete.

In the figure, 68 is a concrete pump, for example, for feeding fresh concrete discharged from a ready-mixed concrete carrier to a pressure-feeding pipe 69, and a mixer 70 is connected to one end of the pipe 69.

An admixture injection pipe 47 is connected to the mixer 70, and the quick-setting agent and the delay agent in the pipe 47 are added to the concrete, and the mixture is mixed and stirred to be pressure-fed to a pressure-feed pipe 71. The pressure is fed to the nozzle 72 connected to the end of the. The nozzle 72 is attached to, for example, a tunnel lining device 73 described in Japanese Patent Publication Nos. 2-26040 and 3-58440 already proposed by the applicant, and an air conduit 74 communicating with the air compressor 35 is attached to the nozzle 72. It is connected so that compressed air can be selectively introduced and its air pressure can be adjusted.

The tunnel lining device 73 is movable along the inner peripheral surface of the tunnel 75 through an appropriate means (not shown), and is provided with a belt mold 76 which is rotatable at the outer position thereof. 76 is disposed opposite to the inner peripheral surface of the tunnel 75, and the hardened concrete is poured, poured, or sprayed into the concrete-filled space between the inner surface and the form frame 76 to form the concrete wall 77. There is.

When the rapid-hardening concrete is produced by the method for producing the rapid-hardening concrete, the placing method, and the placing apparatus configured as described above, and when the concrete is placed, a predetermined quick-setting agent and its retarder are used. The quick-setting admixture, which is used in a larger amount than the delaying agent, is housed and placed in the quick-setting admixture feeder 12.

The amounts of the quick-setting agent and the retarder added differ depending on the concrete pouring timing, the situation at the pouring site, working conditions, etc., and their effects are proportional to the addition amounts. in this case,
The retarder has a function of adjusting the effect onset time of the quick-setting agent by adjusting the addition amount thereof, and has a correlation with the quick-setting agent. For example, the amount of quick-setting agent and retarder added differs depending on the amount of time between the production of rapid-hardening concrete and the start of its placement, and the setting time of cement is affected by temperature. Differs depending on weather conditions, time of day, etc.

Further, the amounts of the quick-setting agent and the retarder added vary depending on the conditions of the concrete placing site, such as the geology of the ground of the tunnel 75, the presence or absence of spring water, and the amount of spring water. It also depends on the working conditions.

For example, using the tunnel lining device 73,
When placing concrete on the inner surface of the tunnel 75,
When pouring or blowing concrete into the side wall of the tunnel 75 as shown in FIGS. 5 (a) and 5 (b), it is better to set the concrete as soon as possible, while as shown in FIG. 5 (c). It is empirically known that, when the top end of the tunnel 75 is cast, it is better to slowly set the concrete after the injection because of the work of removing the nozzle 72 and injecting the concrete.

Focusing on such a point, the inventor has repeatedly conducted experiments on the addition amounts of the quick-setting agent and the retarder under each of the above-mentioned conditions, and can obtain the best result under a single or plural conditions. The addition amount was calculated from the experimental value and stored in the controller 67.

Therefore, when the controller 67 is instructed to adjust the addition amounts of the quick-setting agent and the retarder during the production of the quick-hardening concrete, the controller 67 executes the above-mentioned addition amount adjustment based on the set sequence. Then, in executing the above sequence, concrete setting conditions, that is, information relating to the setting timing, the situation of the setting site and the working conditions, etc. are set in the controller 67, or the setting button prepared on the operation panel is operated. .

In this way, the amounts of the quick-setting admixture and the retarder added are displayed at appropriate places on the controller 67, and the required amount of the quick-adhesion admixture measured from the quick-adhesive feed 12 is fed into the mixer 11 and, at the same time, the solenoid valve. 9 opens the valve and the water is water meter 10
Is supplied to the mixer 11, and the required amount is put into the mixer 11,
These are agitated into a kneaded state by driving the agitator 13. On the other hand, a measured amount of the retarder is put into the mixer 24, the electromagnetic valve 9 is opened at the same time, a required amount of water is put into the mixer 24, and these are stirred by driving the stirrer 25.

Then, after stirring for a predetermined time, the quick-setting agent is added to the conduit 1.
5 is stored in the mixer 14 at the same time, a predetermined amount of water is simultaneously charged into the mixer 14, and these are stirred by the drive of the stirrer 16, and the liquid quick-setting admixture is fed to the feed pump 17 via the conduit 18. The retarder is introduced into the feed pump 26 via the conduit 27 after being stirred for a predetermined time.

The feed pumps 17 and 26 are always stopped in operation, and the quick-setting agent supply pipe 19 and the delay agent supply pipe 2 are provided.
8 means that the continuity with the admixture adding device 23 is always cut off.

As described above, according to the present invention, the contact and mixing of the liquid quick setting agent and the retarding agent after the addition amount adjustment with the concrete are avoided until the start of the concrete pouring. In comparison with the case where these are immediately mixed with concrete to produce, the setting of rapid hardening concrete is avoided, and a sufficient margin can be obtained in producing and using the concrete.

Further, in the present invention, since the required amounts of the quick-setting agent and the retarder are separately supplied and used in combination, as in the conventional method, their quantitative amounts are premixed and prepared, or only one of them is prepared. The setting time of concrete can be finely adjusted as compared with the case of using. Further, in the present invention, the addition amounts of the quick-setting agent and the retarder are rationally set in accordance with the concrete placing conditions and working conditions, so that a suitable quick-hardening concrete that matches the actual conditions of use can be obtained. It can be manufactured in a timely manner.

In addition, when adjusting the amounts of the quick-setting agent and the retarder added, they can be automated in separate steps, so that they can be easily adjusted and at the same time mixing them with concrete. As we will be waiting for the pouring time as described below, we can carry out rapid hardening concrete near the pouring site.

Next, when the concrete is poured after the liquid quick-setting agent and the retarder have been prepared in this way, when the controller 67 is instructed to cast the concrete, the controller 67 follows the set sequence. , Perform concrete pouring.

The controller 67 inspects whether or not there is any abnormality in the pipeline from the admixture adding device 23 to the nozzle 72 prior to concrete pouring. First, the switching valve 56 is alternately rotated via each actuator (not shown), and the switching valves 57 and 58 are also rotated to rotate the spool 5.
The ports 64a and 64b of 6b are alternately communicated with the air supply pipe 36 and the water injection pipe 33, while the valve body 57a,
The ports 61 and 62 of 58a are connected to the passage 50.

By doing so, the rotary spools 57b and 58b of the switching valves 57 and 58 are set as shown in FIG. 4, and the center ports 59 and 60 are disconnected from the quick-setting agent supply pipe 19 and the delay agent supply pipe 28. And instead of port 65b,
Center ports 59 and 60 and the outlet pipe 4 via 66b
8 and 49 communicate with each other.

Therefore, the admixture adding device 23 is first supplied with compressed air from the air supply pipe 36, and this is supplied to the port 6
4a, 64c and the guide passage 51 to be guided to the passage 50, and the guide passages 52, 53 through the center port 5
Move 9,60. The compressed air is then passed through the through hole 4
5, 46 are sent out to the outlet pipes 48, 49, are guided from the admixture injection pipe 47 through the mixer 70 to the pressure feed pipe 71,
It is discharged from the nozzle 72. Therefore, the quick-setting agent, retarder, concrete, etc. remaining in these paths are blown off by the compressed air.

Thereafter, instead of switching the switching valve 56 and closing the port 64a to shut off the compressed air, the port 64b communicates with the through hole 41 and the pressurized water is supplied from the water supply pipe 33, which is the above-mentioned. It is discharged from the nozzle 72 by moving along the same route as. Therefore, after the compressed air is sprayed, the quick-setting agent, retarder, concrete, etc. remaining in these paths are blown off by the pressurized water.

After the pressurized water is supplied, the switching valve 56 is switched to close the through hole 41 and block the pressurized water, but the port 64a communicates with the through hole 42 and compressed air is supplied from the air supply pipe 36. This moves through the same route as described above and is discharged from the nozzle 72. Therefore, the water adhering to these paths is blown off by the compressed air.

In this way, after confirming the continuity of the passages of the quick-setting agent, the delay agent, and the concrete and the quality thereof, the rotary spools 57b and 58b of the switching valves 57 and 58 are turned on by the control signal of the controller 67. From the state of No. 4, for example, rotated by 90 ° in the clockwise direction, the quick-setting agent supply pipe 19 and the outlet pipe 49, and the delay agent supply pipe 28 and the outlet pipe 48 are connected via the ports 65c and 65a and the ports 66c and 66a. While communicating, the ports 61 and 62 of the valve bodies 57a and 58a are closed to cut off the passage 50.

Next, in response to a control signal from the controller 67, the feed pumps 17 and 26 and the concrete pump 6
Drive 8 and.

In this way, the prepared liquid quick-setting admixture and retarder are pressure-fed by the feed pumps 17 and 26, and this is guided to the quick-setting admixture supply pipe 19 and the retarder supply pipe 28, and the admixture. It flows into the supply device 23, where each inflow is metered 30 by the flowmeters 21, 30.

The quick-setting admixture which has flowed into the admixture supply device 23 is
After moving through the ports 66c and 66a, it is sent out from the through hole 46 to the outlet pipe 49, and the retarder moves through the ports 65c and 65 and is sent out from the through hole 45 to the outlet pipe 48. In this case, since the ports 61 and 62 are closed as described above, the quick-setting agent and the delay agent do not flow out into the passage 50.

In this way, the quick-setting agent and the delay agent sent to the outlet pipes 48, 49 are then merged in the admixture injection pipe 47 and guided to the mixer 70. A predetermined amount of kneaded concrete is introduced into the mixer 70 via a pressure-feeding pipe 69, the quick-setting agent and the retarder are added to the concrete, and these are mixed and stirred.

After mixing and stirring the concrete with the admixture, the concrete is sent out from the mixer 70 to the pressure feed pipe 71 and pushed out from the nozzle 72. An air conduit 74 is connected to the nozzle 72 so that compressed air can be introduced. Whether or not the compressed air is introduced depends on the concrete pouring site and working conditions.

For example, when concrete is poured into the lower part of the side wall of the tunnel 75 as shown in FIGS. 5A and 5B, the concrete is poured without supplying compressed air to the nozzle 72. In this way, the concrete is pushed out of the nozzle 72 and the belt form 76 and tunnel 75
The concrete is not separated and dust is not generated when it is poured into the inner surface of the concrete. Therefore,
By spraying concrete as in the conventional case, concrete is not separated, the strength of the concrete wall 77 is not reduced, and a large amount of dust is not generated to deteriorate the working environment.

On the other hand, the concrete pouring as described above is effective at both ends of the side wall of the tunnel 75 having a large concrete pouring drop from the nozzle 72 to the concrete pouring position, and at the other side wall positions, the drop is relatively large. Since it is small, it is possible to introduce compressed air into the nozzle 72 and spray concrete. In this case, it is desirable to suppress the occurrence of the above situation by appropriately adjusting the pressure of the compressed air.

In this way, when the concrete is cast on the side wall of the tunnel 75 and then the concrete is cast on the top end of the tunnel 75, the nozzle 72 in the apparatus of FIG. Concrete is poured into the mold frame 76 as shown in FIG. Therefore, in this case, the compressed air is not supplied to the nozzle 72.

As described above, according to the present invention, the presence or absence of supply of compressed air to the nozzle 72 and the supply amount can be appropriately selected and adjusted, so that the concrete pouring method is poured according to the pouring site and working conditions. Various selections can be made for blowing, spraying, pouring and the like.

By the way, in concrete pouring of the tunnel 75, when pouring concrete on the side wall,
It is desirable that the concrete set as quickly as possible, while the top end set slowly, and thus two types of quick-hardening concrete with different amounts of the quick-setting agent added are required. In this case, the present invention separately prepares the quick-setting agent and the delay agent, and appropriately adds this to the concrete and mixes and stirs it. It is possible to perform concrete pouring work smoothly and efficiently.

Moreover, the present invention uses liquid compounds as the quick-setting agent and the retarder, and these are used as the feed pumps 17, 26.
Since it is pumped by, when supplying or replenishing these,
Solved the problem that the pneumatic pressure-feeding means had to be stopped and the concrete pouring operation had to be stopped once, as in the conventional case where powdered quick-setting agent and retarder were pressure-fed by compressed air. However, concrete can be continuously poured.

On the other hand, when the controller 67 is instructed to clean the admixture adding device 23 and its discharge passage when the concrete pouring is stopped, the controller 67 executes the cleaning based on the set sequence. That is, by the control signal of the controller 67, the concrete pump 68 and the feed pumps 17 and 26 are stopped, the switching valves 56, 57 and 58 are opened and closed via the actuator, and the admixture adding device 23 to the nozzle 72 is opened in the same manner as described above. Compressed air and pressurized water are alternately supplied to the pipelines leading to them, and the quick-hardening concrete and the quick-setting admixture and retarder remaining therein are discharged from the nozzle 72 to wash them.

Therefore, when the concrete pouring is stopped,
It is possible to prevent the situation where the rapidly hardened concrete remaining in the pipeline is solidified, and a good use condition can be obtained during the next use.
It is also possible to supply compressed air only to the nozzle 72 when the concrete pouring is stopped, and in that case, the nozzle 72 can be washed independently.

[0070]

As described above, the method for producing a quick-hardening concrete of the present invention prepares a liquid quick-setting agent, a retarder, and fresh concrete such that they are in contact with each other and cannot be mixed,
Since the required amounts of these liquid quick setting agent, retarder and fresh concrete were mixed at the time of placing concrete,
Compared with the conventional manufacturing method in which these are immediately mixed, a degree of freedom is obtained in the setting time of the quick-hardening concrete, and there is an effect that the usage time and the manufacturing time of the quick-hardening concrete can be diversified. Further, as described above, the method for producing a quick-hardening concrete of the present invention is such that the quick-setting admixture and the retarder are weighed according to the concrete pouring conditions and working conditions, and are mixed at the time of pouring the concrete. It is possible to manufacture a quick-hardening concrete in which the setting time can be finely set according to the casting conditions and working conditions. Further, as described above, the method for pouring quick-hardening concrete of the present invention mixes the liquid quick-setting agent and the retarder at the time of pouring concrete, and depending on the situation of the concrete pouring site and working conditions, etc. , The necessity of compressed air for the nozzle and the air pressure are selectively adjusted,
Since the discharge mode of rapid hardening concrete from the nozzle can be selected, the discharge mode of rapid hardening concrete from the nozzle can be selected according to the concrete placing conditions and working conditions, etc., and an accurate rapid hardening concrete is manufactured. be able to. As described above, the rapid-hardening concrete placing device of the present invention is a feed pump for separately pumping the required amounts of the liquid quick-setting agent and the retarder, and a concrete pump for pumping the required amount of fresh concrete, and these. A mixer that mixes a liquid quick-setting admixture, a retarder, and fresh concrete, and a controller that controls the operation of each of the pumps and a sequence controller that controls the supply of the liquid quick-setting admixture and fresh concrete. It is possible to prepare the quick setting agent and the retarding agent and to automate the placing of the quick hardening concrete. As described above, the rapid-hardening concrete placing device of the present invention comprises a feed pump for separately pumping the required amounts of the liquid quick-setting admixture and the retarder, and the liquid quick-setting admixture, the retarder and the fresh concrete. A mixer for mixing and an admixture adding device between the feed pump and the mixer are provided, and the adding device is provided with a pair of flow paths communicating with the feed pump and the mixer. While providing a switching valve to shut off, the admixture adding device is provided with a pair of flow paths communicating with the water supply source and the air supply source, and selectively connects or cuts off the water supply source and the air supply source at the intersection of these flow paths. A switching valve for controlling admixture, and the above three switching valves are provided so as to be able to conduct through a passage provided inside the admixture adding device, and at least when concrete pouring is stopped, pressurized water and compressed air flow through the admixture adding device, Because a record was discharged rapidly hard concrete is pumped from the mixer into the nozzle,
When concrete pouring is stopped, the quick-setting concrete remaining in the admixture adding device, the pressure-feeding pipe and the nozzle is discharged and washed to prevent solidification of the fast-hardening concrete, and to be used during the next period. It is possible to secure a good discharge state of the rapid-hardening concrete, and to secure long-term use of the admixture adding device, the nozzle, and their passages.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an example of an admixture adding device applied to the present invention.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a cross-sectional view taken along the line BB of FIG.

FIG. 5 is an explanatory view showing a situation in which the present invention is applied to a tunnel lining and concrete is placed on the inner peripheral surface of the tunnel. In FIGS. 5A and 5B, the side wall portion of the tunnel is placed. The situation is shown, and FIG. 7C shows the situation where the top end of the tunnel is driven.

[Explanation of symbols]

 2 Water supply source 11,14,24 Mixer 17,26 Feed pump 23 Admixture adding device 35 Air supply source 50 Passage 56,57,58 Switching valve 67 Controller 68 Concrete pump 70 Mixer 72 Nozzle

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshiharu Aoki 2-3-5 Misaki-cho, Chiyoda-ku, Tokyo Inside Steel Construction Co., Ltd. (72) Inventor Shigeru Oyama 2-chome, Misaki-cho, Chiyoda-ku, Tokyo No. 5-3 Iron Construction Co., Ltd. (72) Inventor Kazushige Tanaka 2-3-5 Misaki-cho, Chiyoda-ku, Tokyo Inside Iron Construction Co., Ltd.

Claims (5)

[Claims] 1. A method for producing a quick-hardening concrete in which a setting time is adjusted by mixing fresh concrete and a quick-setting agent, wherein a liquid quick-setting agent, a retarder, and fresh concrete are in contact with each other and cannot be mixed. A method for producing rapid-hardening concrete, characterized in that the required amounts of these liquid quick-setting agent, retarder and fresh concrete are mixed at the time of pouring concrete. 2. A method for producing a quick-hardening concrete in which fresh concrete and a quick-setting admixture are mixed to adjust the setting time of the concrete, wherein the quick-setting admixture and the retarder are used as concrete pouring conditions and working conditions. Adjust accordingly,
A method for producing rapid-hardening concrete, which comprises mixing this when pouring concrete. 3. A quick-hardening concrete having a setting time adjusted by mixing fresh concrete and a quick-setting agent,
Guide the concrete to a nozzle capable of supplying compressed air,
In a method of placing quick-hardening concrete in which the quick-hardening concrete is discharged from the nozzle, a liquid quick-setting agent and a retarder are mixed at the time of placing the concrete, and depending on the situation of the concrete-placing site and working conditions, etc. A method for placing quick-hardening concrete, characterized in that the necessity of compressed air and the air pressure for the nozzle are selectively adjusted so that the discharge mode of the quick-hardening concrete from the nozzle can be selected. 4. A feed pump for separately pumping the required amounts of a liquid quick-setting agent and a retarder, a concrete pump for pressure-feeding the required amount of fresh concrete, and these liquid quick-setting agent, retarder and fresh concrete. And a controller for controlling the operation of each of the pumps and for sequence-controlling the supply of the liquid quick-setting agent and fresh concrete. 5. A feed pump for separately pumping required amounts of a liquid quick-setting admixture and a retarder, a mixer for mixing the liquid quick-setting admixture, the retarder and fresh concrete, and these feed pumps and mixers. An admixture addition device is provided between the admixture, a pair of flow passages communicating with the feed pump and the mixer are provided in the addition device, and a switching valve for connecting and disconnecting the feed pump is provided in the flow passage, while the admixture is added. The addition device is provided with a pair of flow paths communicating with the water supply source and the air supply source,
A switching valve that selectively connects or disconnects the water supply source and the air supply source is provided at the intersection of these flow paths, and the three switching valves are provided so as to be able to conduct through a passage provided inside the admixture addition device,
At least when the pouring of concrete is stopped, pressurized water and compressed air are made to flow through the admixture adding device, and this is pressure-transmitted from the mixer to the nozzle to expel the quick-hardening concrete. apparatus.