CN209780911U

CN209780911U - Concrete injection device

Info

Publication number: CN209780911U
Application number: CN201920113507.6U
Authority: CN
Inventors: 孙辉; 李树忱; 陈鲁川; 张露晨; 许孝滨; 冯现大
Original assignee: Qilu Transportation Development Group Co Ltd; Shandong University
Current assignee: Shandong University; Shandong High Speed Group Co Ltd
Priority date: 2019-01-23
Filing date: 2019-01-23
Publication date: 2019-12-13
Anticipated expiration: 2029-01-23

Abstract

the application discloses concrete injection apparatus, injection apparatus includes: an injection machine; a nozzle comprising two input ports, one of which is in communication with the sprayer and the other of which is in communication with the accelerator supply; the accelerator supply apparatus further includes: the side wall of the shell is provided with a suction port for adding a liquid accelerator, one end of the shell is provided with a discharge port, and the inside of the shell forms a sealed cavity; the self-suction screw is arranged in the shell and used for sucking the liquid setting accelerator from the material suction port and discharging the liquid setting accelerator from the material discharge port; the driving device is arranged at the other end of the shell, an output shaft of the driving device is connected with a rod end of the self-suction screw, and the driving device controls the rotating speed of the self-suction screw so as to control the flow of the liquid accelerator; the atomizer is used for mixing the accelerating agent with the concrete mixture in an atomized state; the liquid accelerator is discharged from a discharge port, and is mixed with the concrete mixture at a nozzle after the atomization action of the atomizer.

Description

Concrete injection device

Technical Field

the present disclosure relates generally to the field of underground construction machinery, and more particularly to a concrete injection apparatus.

Background

the concrete spraying technology is widely applied to the surface support of the surrounding rock of the cavern in underground engineering such as tunnels, subways, mines and the like, and is one of three major support technologies for tunnel construction by the new Austrian tunneling method. The sprayed concrete can support the excavated cavern in time, and an integral supporting structure is formed by combining an anchor rod, a steel arch frame, a reinforcing mesh and the like, so that the deformation of surrounding rocks can be effectively inhibited, and the construction safety is guaranteed. The accelerator is an essential additive of the sprayed concrete, and mainly plays a role in accelerating the concrete hardening, improving the thickness of a primary sprayed layer and reducing the resilience, namely, the sprayed concrete plays a due role in supporting the surrounding rock of the underground cavern due to the existence of the accelerator.

At present, two concrete spraying processes, namely wet spraying and wet spraying, are mainly used in China.

The wet concrete spraying process comprises the steps of uniformly stirring cement, stones, sand, water and a water reducing agent in a mixing station, pouring the mixture into a commercial mixing truck and conveying the mixture to a construction site; the wet spraying concrete adopts a liquid accelerator, the wet mixed material is conveyed to a nozzle through a conveying pipe under the pressure of high-pressure air or pumping through a wet spraying machine, and the liquid accelerator is added to the nozzle and sprayed to the surface of the surrounding rock. Because of the advantages of high strength, small resilience, small dust and the like of the wet-sprayed concrete, the wet-sprayed concrete is more and more widely applied and becomes a main spraying mode.

The wet spraying concrete process is that cement, stones, sand and a small amount of water are uniformly stirred in a mixing station and are conveyed to a spraying site; the wet spraying concrete adopts a powdery accelerator, and is added into a dry spraying machine together with concrete mixture through manual work or a feeding machine, under the action of high-pressure air, the mixture is conveyed to a nozzle through a conveying pipe, and water is added to the nozzle and is sprayed to the surface of surrounding rock.

The existing concrete spraying process has the problems of inaccurate control of the mixing amount of the accelerator and uneven mixing with concrete, so that a large amount of sprayed concrete falls off, and hidden troubles are brought to engineering safety.

In addition, in the shotcrete process, the liquid accelerator is mainly applied to wet shotcrete, but cannot be applied to wet shotcrete. In the wet spraying concrete process, the concrete is added through a metering pump in a wet spraying machine. At present, the problems of inaccurate doping amount control, uneven mixing with concrete materials and the like exist in the liquid accelerator, so that a large amount of wet sprayed concrete falls off, the construction efficiency is seriously influenced, and the potential safety hazard is brought to engineering safety.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned drawbacks and deficiencies of the prior art, it would be desirable to provide a concrete spraying solution that improves the quality of concrete spraying.

In a first aspect, an embodiment of the present application provides a concrete spraying apparatus, including:

An injection machine;

A nozzle comprising two input ports, one of said input ports being in communication with said eductor and the other of said input ports being in communication with an accelerator supply apparatus;

The accelerator supply apparatus further includes:

the side wall of the shell is provided with a suction port for adding a liquid accelerator, one end of the shell is provided with a discharge port, and the inside of the shell forms a sealed cavity;

The self-sucking screw is arranged in the shell and used for sucking the liquid setting accelerator from the material sucking port and discharging the liquid setting accelerator from the material discharging port;

the driving device is arranged at the other end of the shell, an output shaft of the driving device is connected with a rod end of the self-suction screw, and the driving device controls the rotating speed of the self-suction screw so as to control the flow of the liquid accelerator;

The atomizer is used for mixing the accelerator with a concrete mixture in an atomized state;

And the liquid accelerator is discharged from the discharge port, passes through the atomization effect of the atomizer and then is mixed with the concrete mixture at the nozzle.

In some embodiments of the present application, the driving device further includes a speed reducer, an output shaft of the speed reducer being connected to a rod end of the self-priming screw.

Furthermore, the driving device also comprises a motor, and an input shaft of the speed reducer is connected with an output shaft of the motor.

In some embodiments of the present application, the accelerator supply apparatus further includes a controller, the controller is connected to the speed reducer, and controls the rotation speed of the self-priming screw by adjusting the transmission ratio of the speed reducer, so as to control the output flow of the driving screw to the liquid material.

In certain embodiments of the present application, the controller includes a display device to display the output flow rate of the liquid. The flow of the accelerator can be displayed on the display through the digital display controller, so that the mixing amount of the liquid accelerator can be clearly observed and accurately controlled.

in other embodiments of the present application, the driving device is a control motor, an output shaft of the control motor is directly connected to a rod end of the self-priming screw, and the controller is disposed in the control motor.

The jet machine is communicated with a compressed air pipeline.

the discharge gate pass through the accelerator pipeline with the inlet intercommunication of atomizer, the nozzle of atomizer with another input port intercommunication.

The quick-setting admixture discharging device is characterized by further comprising a water pipe branch, wherein the water pipe branch is communicated to the quick-setting admixture pipeline behind the discharging port and in front of the liquid inlet of the atomizer. Specifically, a water pipe branch can be communicated into the pipeline through a three-way pipe, one input port of the three-way pipe is connected with the discharge port, the other input port of the three-way pipe is connected with the water pipe, and an output port of the three-way pipe is connected with the atomizer. The spraying device provided with the water pipe branch can apply the liquid setting accelerator to the wet spraying concrete process. Through the setting of the three-way pipe, the liquid setting accelerator and the water are atomized in the atomizer, so that the hydration process time of the liquid setting accelerator and the water can be greatly reduced, and the liquid setting accelerator can be applied to a dry spraying process.

In a second aspect, embodiments of the present application provide a concrete spraying method, including the following steps:

Quantitatively supplying a liquid accelerator by using a quantitative supply device of the accelerator;

atomizing the liquid accelerator by using an atomizer;

And mixing the atomized liquid accelerator with dry-mixed concrete or wet-sprayed concrete to be sprayed, and carrying out spraying operation.

The concrete injection apparatus that this application embodiment provided can be applied to the liquid accelerator in wet shotcrete and wet shotcrete. The liquid accelerator and the spraying function are used, so that the accelerator can be rapidly hydrated with the concrete mixture in an atomized state, and the coagulation effect is improved.

for wet spraying, atomizing device makes liquid accelerator and concrete material mix abundant, reduces the hydration time to with concrete material misce bene, when playing the effect of showing flash mixed, the volume of mixing of control liquid accelerator that quantitative supply equipment can be more accurate, thereby avoid the problem that the wet shotcrete that traditional wet spraying operation caused drops in a large number, improve the efficiency of construction greatly, the potential safety hazard of greatly reduced engineering.

Compared with the powdery accelerator used in the wet spraying process, the liquid accelerator can be applied to the dry spraying concrete process by atomizing the liquid accelerator. The liquid accelerator is used in the dry-spraying concrete, so that the hydration process time with water can be reduced, the mixing amount in field application can be well controlled, and a large amount of dust is avoided, so that the defects of serious concrete strength attenuation and large discreteness in the conventional dry-spraying operation are avoided.

This equipment need not to improve to current injection apparatus, can realize spraying the quick accurate atomizing of liquid accelerator, when make full use of current injection apparatus, through the cost of manufacture lower to the dosing device, can improve greatly and spray quality and spray environment, green.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic diagram showing the structure of a liquid accelerator metering apparatus in the embodiment of the present application;

FIG. 2 shows a flow chart of a wet-spraying concrete process using the apparatus in the example of the present application;

FIG. 3 shows a flow chart of a wet shotcrete process using the apparatus in an embodiment of the present application;

Description of the element reference numerals

1 electric machine

2 speed reducer

3 digital display controller

4 material sucking port

5 casing

6 discharge port

7 atomizer

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the described embodiments are part, and not all, of the present invention. For convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that, without conflict, the components of the embodiments of the present invention, generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention.

As shown in fig. 1, the present application provides a spraying device for a liquid setting accelerator, which includes a sprayer, a nozzle, a dosing device, and an atomizer. The ejector is in communication with a conduit for supplying compressed air, and the nozzle of the ejector comprises two inlet ports, one of which is in communication with the ejector and the other of which is in communication with the spray opening of the atomizer in the dosing device.

the dosing device comprises: the device comprises a motor 1, a speed reducer 2, a digital display controller 3, a shell 5 and a self-suction screw rod.

The lateral wall department of casing is equipped with the suction opening 4 that is used for adding the liquid accelerator, and the one end of casing is equipped with discharge gate 6, and the inside of casing constitutes sealed chamber. The self-sucking screw is arranged in the shell 5 and used for sucking the liquid setting accelerator from the material sucking port and discharging the liquid setting accelerator from the material discharging port. The motor is arranged at the other end of the shell as a driving device, an output shaft of the motor is connected with an input shaft of a speed reducer, and an output shaft of the speed reducer is connected with a rod end of the self-suction screw rod. The speed reducer is provided with a digital display controller, and the digital display controller can adjust the transmission ratio of the speed reducer to control the rotating speed of an output shaft of the speed reducer (namely the rotating speed of the self-suction screw) so as to control the output flow of the liquid material. It can be understood that the shell, the self-suction screw, the motor, the speed reducer and the digital display controller jointly form a screw pump, and table 1 shows flow parameters of the screw pump.

TABLE 1 screw Pump flow parameters

Opening degree	Revolutions per minute	flow per revolution per ml	Minute (min)	1000 ml	Hourly output volume/ml
						0	30	9	60	0.001	16.2
0.5	40	9	60	0.001	21.6
						1	50	9	60	0.001	27
1.5	60	9	60	0.001	32.4
						2	70	9	60	0.001	37.8
2.5	80	9	60	0.001	43.2
						3	90	9	60	0.001	48.6
3.5	100	9	60	0.001	54
						4	110	9	60	0.001	59.4

It can be seen that the rotation number of the screw is adjusted through the digital display controller, and then the flow rate of the liquid accelerator can be controlled.

the discharge port of the shell is provided with an interface connector which can be connected with a pipeline as required. When wet spraying is adopted, the interface connecting piece is directly communicated with the liquid inlet of the atomizer; when the wet spraying method is adopted, the interface connector is firstly communicated with the three-way pipe, the other input port of the three-way pipe is connected with the water pipe, and the output port of the three-way pipe is communicated with the atomizer. The liquid accelerator is discharged from a discharge port, and is mixed with the concrete mixture at a nozzle after the atomization action of the atomizer.

The motor mainly provides power, and the speed reducer reduces the rotational speed of motor, and the volume of mixing of digital display controller control liquid accelerator from inhaling the screw rod conveying liquid accelerator, the atomizer makes liquid accelerator carry out different atomization effect.

when can understand, to the control motor that can direct accurate control from inhaling the screw speed, even do not have speed reducer and digital display controller, because it still can realize from inhaling the control of screw and then control the flow of liquid accelerator, therefore still be in the protective scope of this application.

Specific can be, liquid accelerator inserts feed inlet 4 through the hose from the storage bucket, starter motor 1, speed reducer 2 links to each other with motor 1, digital display controller links to each other with speed reducer 2, can be with the rotational speed of 2 control screw rods of speed reducer, thereby control liquid accelerator's flow, liquid accelerator transports in the screw rod, in 6 atomizer 7 that get into of discharge gate, atomize liquid accelerator, the pressure that whole equipment provided is nozzle department of impressing liquid accelerator, with concrete mix intensive mixing, spray to receiving the spray surface, thereby accomplish whole liquid accelerator's transportation process.

When the wet-spraying concrete process flow is adopted, a discharge hole of a shell in the quantitative supply equipment is directly connected with the atomizer. The wet spraying concrete process flow is as shown in figure 2, cement, gravel, sand and water are mixed at a mixing station, transported to a construction site by a commercial mixing truck, poured into a spraying machine, added with an atomized liquid accelerator provided by a quantitative supply device at a nozzle, and quickly and fully mixed with the concrete mixture at the nozzle and can be directly sprayed to a sprayed surface.

The embodiment of the application can also be applied to wet sprayed concrete.

The traditional wet spraying concrete mainly uses a powdery accelerator, and the powdery accelerator is generally added by a screw feeder or manually. Because the powdery accelerator and the concrete mixture need a certain time for hydration, the mixing amount is too large when the powdery accelerator is applied on site, and a large amount of dust is generated, so that the strength attenuation of the concrete is serious, and the discreteness is large.

When the wet spraying concrete process flow is adopted in the embodiment of the application, the discharge hole of the shell in the quantitative supply equipment is communicated with the three-way pipe firstly, the other input port of the three-way pipe is connected with the water pipe, and the output port of the three-way pipe is communicated with the atomizer. The wet spraying concrete process flow is as shown in figure 3, cement, stones, sand and a small amount of water are mixed well in a mixing station, the mixture is conveyed to a construction site by a dump truck, the mixture is put into a spraying machine through a feeding machine or manually, a liquid accelerator enters a high-pressure water pipe through the quantitative supply equipment and is conveyed to a nozzle together with the water, and an atomizer is arranged at the nozzle to enable the mixed liquid to be fully atomized, mixed with concrete and sprayed to a sprayed surface.

Compared with a dry-spraying type accelerator, the liquid accelerator is used in dry-spraying concrete, so that the hydration process time of water can be reduced, the mixing amount in field application can be well controlled, and a large amount of dust is prevented from being generated, so that the defects of serious attenuation and large discreteness of concrete strength in the conventional dry-spraying operation are overcome. The liquid accelerator is applied to the wet sprayed concrete, so that the resilience and dust of the wet sprayed concrete can be greatly reduced, and the strength of the sprayed concrete is improved. The resilience of the traditional dry-sprayed concrete is generally 25-40%, and the dust concentration is 1120-1470 mg/m 3; by adopting the process of the device, the resilience is 8-15%, the dust concentration is 76-135 mg/m3, and the slump of the wet-sprayed concrete can be greatly reduced.

The equipment provided by the embodiment of the application has a self-suction function because the sealed cavity is arranged in the equipment and vacuum can be generated under the rotation of the screw rod. Through the digital display controller, the doping amount of the liquid setting accelerator can be accurately controlled, and the flow of the setting accelerator can be displayed on the display, so that the doping amount of the liquid setting accelerator can be clearly observed and timely adjusted. The atomizer can be dismantled at any time, wherein contains power component, can carry out the atomization effect of different degrees to liquid accelerator, is favorable to liquid accelerator and concrete mix to carry out the intensive mixing to improve shotcrete's performance.

through the utility model discloses a liquid accelerator ration equipment has realized using liquid accelerator in the wet shotcrete and wet shotcrete, and this equipment can the doping amount of accurate control liquid accelerator to can atomize liquid accelerator, make more even with the mixing of concrete mix, thereby improve the performance of spraying concrete.

the foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. A concrete spraying apparatus, comprising:

An injection machine;

The accelerator supply apparatus further includes:

2. The concrete injection apparatus of claim 1, wherein the driving device further comprises a speed reducer, and an output shaft of the speed reducer is connected with a rod end of the self-priming screw.

3. The concrete injection apparatus of claim 2, wherein the drive unit further comprises a motor, and the input shaft of the speed reducer is connected to the output shaft of the motor.

4. The concrete spraying apparatus according to claim 2, wherein the accelerator supply device further comprises a controller connected to the speed reducer, wherein the controller controls the rotation speed of the self-priming screw by adjusting a transmission ratio of the speed reducer.

5. a concrete spraying apparatus as claimed in claim 4, wherein the controller includes display means for displaying the output flow of liquid.

6. A concrete spraying apparatus as claimed in claim 1, wherein the drive means is a control motor, the output shaft of which is directly connected to the rod end of the self-priming screw.

7. a concrete spraying apparatus as claimed in claim 1, wherein the spraying machine is in communication with a compressed air line.

8. A concrete spraying device as claimed in any one of claims 1 to 7, wherein the outlet port is in communication with the inlet port of the atomiser via an accelerator line, the spray outlet of the atomiser being in communication with the other of the inlet ports.

9. The concrete spraying device as recited in claim 8, further comprising a water pipe branch, said water pipe branch communicating with said accelerator pipe after said outlet port and before said liquid inlet port of said atomizer.