Grouting material and preparation method thereof

Abstract

The present application relates to the technical field of grouting material production, specifically disclosing a grouting material and a preparation method thereof, comprising the following steps: S1: preparing the following materials in parts by mass: 720-760 parts of cement, 200-230 parts of stone powder, 15-25 parts of silica fume, 2-3 parts of powdered water reducer, 0.1-0.5 parts of defoaming powder, 0.1-0.5 parts of expansive powder, and 2-6 parts of stabilizer; S2: placing the cement and stone powder in a stirring device in sequence and uniformly stirring for 5-10 minutes, with the cement and stone powder introduced into the bottom of the stirring device via a pipe; S3: then introducing the silica fume, suspended powder, defoaming powder, expansive powder, and stabilizer in step S1 into the stirring device in sequence through the pipe; S4: taking out the powdered grouting material formed after stirring and packaging it. The purpose of this patent is to solve the problem that in the process of preparing grouting material, cement and materials need to be stirred and mixed, but dust is generated during the stirring process, and the dust is released into the environment and pollutes the air.

Description

Technical Field

[0001] The present invention relates to the technical field of grouting material production, in particular to a grouting material and a preparation method thereof. Background Art

[0002] Grouting material is a product specially used for grouting construction of post-tensioned prestressed pipes (holes). It is optimized and formulated from a variety of high-quality cement-based materials and high-performance admixtures. It has excellent fluidity, stable slurry, good filling degree, adjustable setting time, no shrinkage, slight expansion, high strength, and does not contain substances harmful to steel bars. Grouting material is widely used in various railway and highway post-tensioned prestressed bridge duct grouting and large prestressed structure duct grouting.

[0003] When preparing grouting material, cement and other materials are placed in a container with an open top, and some materials are poured into the container, and then stirred and mixed. The final grouting material is in dry powder form. Finally, the mixed powdered grouting material is packaged through a pumping device. When it is needed, the bagged grouting material is transported to the site. The on-site operator only needs to add an appropriate amount of water according to the standard and stir it evenly before use.

[0004] Currently, containers for mixing cement and materials to form grouting materials have appeared on the market. For example, the patent with publication number CN218286132U discloses an environmentally friendly grouting powder mixing device, which includes a mixing cylinder and a feed cylinder. A feed hopper is provided on the top of the mixing cylinder. Secondly, according to the drawings in the specification, it can be judged that the top of the feed cylinder is open. During operation, cement and materials need to be added to the mixing cylinder from the bottom of the feed cylinder. However, due to the opening on the top of the feed cylinder, cement and materials are poured directly into the mixing cylinder from the top of the feed cylinder. Some materials will remain on the surface of the cement. At this time, the stirring time needs to be extended to mix the cement and other materials evenly, which greatly reduces the efficiency of preparing pressure drop materials. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a grouting material and a preparation method thereof. First, it solves the problem that when preparing the grouting material, the staff pours the material directly on the surface of the additive. During stirring, the additive remaining on the cement surface is difficult to enter the bottom layer of the cement, resulting in uneven stirring.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is:

[0007] A grouting material and a preparation method thereof, comprising the following steps:

[0008] S1: Prepare the following materials by mass: 720-760 parts of cement, 200-230 parts of stone powder, 15-25 parts of silica fume, 2-3 parts of powder water reducer, 0.1-0.5 parts of defoaming powder, 0.1-0.5 parts of expansion powder, and 2-6 parts of stabilizer;

[0009] S2: Place cement and stone powder into the mixing device in sequence and mix them evenly for 5-10 minutes. Use a pipe to introduce cement and stone powder into the bottom of the mixing device. The gas at the pipe outlet will suspend the materials at the bottom 2 / 3 of the mixing device.

[0010] S3: Then, the silicon powder, suspension powder, defoaming powder, expansion powder and stabilizer in step S1 are sequentially introduced into the stirring device through the pipeline and stirred for 15 to 20 minutes. The gas flow rate at the pipeline outlet is less than the settling rate of the dust in the stirring device.

[0011] S4: taking out the powdered pressed slurry formed after the stirring is completed and packaging it;

[0012] The principles of this program are:

[0013] When preparing grouting material, the cement and stone powder, which account for a relatively large proportion of the grouting material, are first passed through the pipeline into the mixing drum for stirring. Since the mass of cement and stone powder is relatively large, gas is used to quickly blow the materials into the stirring device. After the materials are fed in, the stirring device is started to stir the raw materials in the mixing drum; after stirring for 5 minutes to 10 minutes, the other raw materials are passed into the stirring device in turn. At this time, since the proportion of other raw materials is relatively small and the flow rate of the air flow is reduced, the flow rate of the air flow is less than the settling rate of the dust.

[0014] Glossary:

[0015] Settling velocity: The speed at which dust settles freely in a closed container with no air circulation.

[0016] The beneficial effects of this program are:

[0017] 1. In the present application, the pipeline for transporting raw materials is set at the lower part of the mixing device, and the raw materials are pumped into the mixing device through the pipeline. At this time, there is no need to manually pour cement into the mixing drum, which reduces the situation where the dust generated during the manual pouring process is inhaled by the operator; secondly, when the raw materials are transported to the bottom layer of the mixing device, the materials will be evenly mixed during the mixing process. Compared with the traditional method of pouring the materials directly from the top of the cement, the materials will remain on the surface of the cement. During the mixing process, it is difficult for the materials to enter the lower layer of the cement. At this time, it takes a longer time to stir evenly, which reduces the energy consumption of the mixing equipment.

[0018] 1. In the present application, after all the raw materials are added, that is, in step S3, a low-flow airflow is continuously introduced into the stirring device. At this time, the raw materials will be blown up and dispersed by the airflow and suspended in the stirring device. Under the stirring of the stirring device, a variety of dispersed and suspended raw materials are mixed, thereby achieving the purpose of uniform mixing.

[0019] Furthermore, the mixing drum of the stirring device in step S2 is provided with a discharge port for discharging materials at the bottom end of the mixing drum, a rotatable stirring shaft is vertically installed inside the mixing drum, the stirring shaft extends to the lower part of the mixing drum, the interior of the stirring shaft is hollow, a first air duct for transporting materials is vertically installed inside the stirring shaft, and a second air duct for dust removal is provided on the periphery of the first air duct, the outlet end of the second air duct is horizontally rotated and connected to a dust suction pipe for absorbing dust, a sensor for detecting dust concentration is installed on the top of the interior of the mixing drum, and a powder box for separately storing materials for preparing slurry is placed outside the mixing drum, and the powder box is connected to the first air duct. The materials for producing grouting material are placed separately in each powder box. At this time, cement and other materials are pumped from the powder box to the mixing drum for mixing in turn. Since the first air channel is vertically arranged at the lower part of the mixing drum, when cement is first added, the height of the cement in the mixing drum is higher than the bottom end of the mixing shaft. At this time, stone powder and other materials are pumped from the first air channel into the mixing drum to be mixed with the cement. The high concentration of dust generated during the mixing process will be sucked away by the first air channel. After the mixing is completed, the powdered grouting material formed by the mixing is discharged from the discharge port for packaging.

[0020] By setting up a second air channel and a sensor, during the mixing process, the sensor monitors the dust concentration inside the mixing drum at any time. When a high concentration of dust is generated, gas is inflated into the second air channel to suck away the dust, preventing the dust concentration from being too high and then spreading to the surrounding environment; when the dust concentration is too high, some dust will overflow from the gaps in the upper part of the mixing drum into the surrounding environment, causing environmental pollution.

[0021] Furthermore, the top of the first air duct extends vertically toward the top of the mixing drum and is connected to the powder box for placing the pumped material. A pin shaft for fixing the first air duct is installed horizontally between the first air duct and the second air duct. At the same time, a rubber membrane for controlling the air intake of the second air duct is evenly arranged on the contact part of the first air duct and the second air duct; when the powder enters the mixing drum from the first air duct, the pressure in the first air duct is greater than the pressure in the second air duct, and the rubber membrane will be squeezed toward the side of the second air duct. Since the material is not directly poured onto the surface of the cement during the feeding process, not much dust is generated. At this time, the gas flow in the second air duct is reduced, saving equipment energy consumption; and when one material is added, the pressure in the first air duct is less than the pressure in the second air duct, the rubber membrane will restore its deformation, and the space of the second air duct will become larger. At this time, if the sensor detects that the dust concentration is high, a large amount of gas will enter the dust suction pipe to suck away the dust with a high concentration.

[0022] Furthermore, the dust suction pipe is evenly arranged on both sides of the rotation center of the stirring shaft. The dust suction pipe and the stirring shaft are connected with a rotary joint. Suction heads for absorbing dust are evenly distributed horizontally on the bottom of the dust suction pipe. The structure of the dust suction pipe and the suction head for absorbing dust is similar to the structural principle of the Venturi tube. When the air flow passes through the dust suction pipe, the dust in the stirring drum will enter the dust suction pipe from the suction head.

[0023] Furthermore, the first air duct and the second air duct are respectively connected to two separate variable frequency air pumps. The first air duct extends horizontally to the outside of the mixing drum. The two air pumps separately control the air intake volume of the first air duct and the second air duct. The dust in the dust suction pipe will be blown into the dust collecting bag for filtration.

[0024] Furthermore, a frame is fixedly installed on the outer periphery of the mixing drum, and a bracket is horizontally installed on the top of the frame. A motor for driving the mixing shaft to rotate is fixedly installed on the bracket. The output shaft of the motor is vertically downward, and a driving gear is connected to the output shaft of the motor. The driving gear is engaged with the top of the mixing shaft. The motor is symmetrically arranged along the rotation center of the mixing shaft. The driving gear is driven to rotate by the motor, and then the mixing shaft engaged with the driving gear can be driven to rotate.

[0025] Furthermore, stirring rollers are installed laterally in the middle and bottom of the stirring shaft. The stirring rollers are arranged radially along the center of rotation of the stirring shaft. The stirring rollers are composed of a fixed rod and a telescopic rod. The telescopic rod is sleeved inside the fixed rod. During the rotation of the stirring shaft, the telescopic rod will be thrown out under the action of centrifugal force to mix and stir the powder located at the inner edge of the stirring drum, thereby greatly increasing the stirring range. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the present invention;

[0027] Figure 2For the present invention Figure 1 (A) Schematic diagram of the enlarged area;

[0028] Figure 3 This is a schematic diagram of the top view of the assembly of the stirring roller of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the stirring roller of the present invention;

[0030] Figure 5 Schematic diagram of the first airway and the second airway of the present invention;

[0031] Figure 6 This is a schematic diagram of the top view of the pin position of the present invention.

[0032] The reference numerals in the drawings of the specification include:

[0033] Mixing drum 1, frame 2, bracket 2-1, stirring shaft 3, stirring roller 4, fixed rod 4-1, telescopic rod 4-2, first air duct 5, dust suction pipe 6, second air duct 6-1, rubber membrane 6-2, pin 6-3, dust bag 6-4, rotary joint 6-5, motor 7, drive gear 7-1, discharge port 8, sensor 9. DETAILED DESCRIPTION

[0034] The following is further described in detail through specific implementation methods:

[0035] Attach Figure 1 and attached Figure 2 For example, in the accompanying drawings, the motors 7 are installed on the left and right sides of the top of the stirring shaft 3, which is used as a direction reference.

[0036] The embodiment is basically as shown in the attached Figure 1 As shown:

[0037] The preparation of grouting material requires the following steps:

[0038] S1: Prepare the following materials with a total mass of 1 ton: cement 750 kg, stone powder 225 kg, silica fume: 20 kg, powder water reducer 2.27 kg, defoaming powder 0.13 kg, expansion powder 0.3 kg, stabilizer 4 kg, and place the materials in different powder boxes (the powder boxes are not drawn in the figure);

[0039] S2: Place cement and stone powder into the mixing device in sequence and mix them evenly for 5 minutes. The cement and stone powder are introduced into the bottom of the mixing device through a pipe. The gas at the outlet of the pipe suspends the materials at the bottom 2 / 3 of the mixing device.

[0040] The stirring device is a cylindrical stirring drum 1, and the structure of the stirring drum 1 is as shown in the attached figure. Figure 1As shown, the top of the mixing drum 1 is closed, a rectangular frame 2 is fixedly installed on the periphery of the mixing drum 1, a discharge pipe for discharging the slurry is installed at the bottom of the mixing drum 1, and the outlet end of the discharge pipe is connected to the bagging equipment.

[0041] A hollow stirring shaft 3 is vertically installed in the middle of the stirring drum 1, and the top end of the stirring shaft 3 extends to the outside of the stirring drum 1, and the bottom end of the stirring shaft 3 is located at the bottom layer of the stirring drum 1. The stirring shaft 3 extends out of the outer periphery of the stirring drum 1 and is provided with a tooth groove for driving the stirring shaft 3 to rotate. A bracket 2-1 is horizontally installed on the top of the frame 2, and the top end of the stirring shaft 3 vertically penetrates the bracket 2-1. Motors 7 are respectively installed on both sides of the stirring shaft 3. The motors 7 are symmetrically arranged along the rotation center of the stirring shaft 3. The output shaft of the motor 7 is vertically downward, and a driving gear 7-1 for engaging with the tooth groove of the stirring shaft 3 is fixed on the output shaft of the motor 7. The two motors 7 are started at the same time to drive the stirring shaft 3 to rotate, thereby stirring and mixing the powdered raw materials in the stirring drum 1.

[0042] A first air channel 5 is vertically opened in the middle of the stirring shaft 3, and the first air channel 5 vertically penetrates the stirring shaft 3. The top end of the first air channel 5 extends to the outside of the stirring drum 1 and is connected to the powder box for placing the material for preparing the slurry. At the same time, a variable frequency air pump is installed at the connection between the first air channel 5 and the powder box. When the slurry needs to be prepared, the air pump is started, and the air pump pumps the material placed in the powder box into the stirring drum 1, and the stirring shaft 3 rotates to mix the raw materials.

[0043] The bottom end of the stirring shaft 3 is located at the bottom layer inside the mixing drum 1. When cement is poured in first, the cement will "flood" the bottom of the stirring shaft 3. At this time, when stone powder is poured in, the stone powder will enter the bottom layer of the cement. Under the rotation and stirring of the stirring shaft 3, the stone powder will be evenly spread, shortening the time for evenly mixing the stone powder and cement.

[0044] The stirring roller 4 is installed horizontally on the part of the stirring shaft 3 located in the stirring drum 1. The structure of the stirring roller 4 is shown in the attached figure. Figure 4 As shown, the stirring rollers 4 are arranged radially along the axis of the stirring shaft 3. The stirring rollers 4 are composed of two parts, namely a fixed rod 4-1 fixedly connected to the stirring shaft 3 and a telescopic rod 4-2 that can move laterally. A transverse groove is provided in the middle of the fixed rod 4-1, and a spring is fixedly installed in the groove. The telescopic rod 4-2 is placed in the groove of the fixed rod 4-1 and is fixedly connected to the spring; when the stirring shaft 3 rotates, it is thrown out under the action of the centrifugal force of the stirring shaft 3, thereby increasing the stirring range of the stirring shaft 3.

[0045] A sensor 9 for detecting the dust concentration in the mixing drum 1 is fixedly provided at the inner top of the mixing drum 1, and a second air duct 6-1 parallel to the first air duct 5 is provided between the first air duct 5 and the outer wall of the mixing shaft 3. The top of the second air duct 6-1 also extends to the outside of the mixing drum 1. At the same time, the outlet end of the second air duct 6-1 is located above the mixing roller 4. A rotatable cylindrical rotary joint 6-5 is installed at the outlet of the second air duct 6-1, and a dust suction pipe 6 is installed horizontally on the left and right sides of the rotary joint 6-5. One end of the dust suction pipe 6 extends outside the frame 2, and the outlet end of the dust suction pipe 6 is connected to the dust collecting bag 6-4. Suction heads connected to the inside of the dust suction pipe 6 are evenly distributed on the bottom surface of the dust suction pipe 6. At the same time, the air source of the second air duct 6-1 is supplied by another air pump.

[0046] During the process of mixing cement or materials, if the dust concentration in the mixing drum 1 is too high, the air pump of the second air channel 6-1 is turned on and air is supplied to the second air channel 6-1 and the dust suction pipe 6. Using the principle of the Venturi tube, when a faster air flow is introduced into the dust suction pipe 6, the dust with a higher concentration will be sucked into the dust suction pipe 6 and removed from the mixing drum 1 through the dust collecting bag 6-4.

[0047] As attached Figure 5 and attached Figure 6 As shown in the accompanying drawings, a horizontal pin 6-3 is evenly distributed between the first air channel 5 and the second air channel 6-1. The pin 6-3 is used to install the first air channel 5 in the stirring shaft 3. A rubber membrane 6-2 composed of rubber is evenly distributed on the inner wall of the first air channel 5. The rubber membrane 6-2 is spaced apart from the pin 6-3. During the discharge stage, when the material enters the mixing drum 1 through the first air channel 5, the pressure in the first air channel 5 is greater than the pressure in the second air channel 6-1. At this time, the rubber membrane 6-2 will expand into the second air channel 6-1, and the gas flow in the second air channel 6-1 will decrease successively. After the discharge of the first air channel 5 is completed, the pressure of the first air channel 5 returns to normal, the rubber membrane 6-2 is reset, and the space in the second air channel 6-1 increases. During the discharge stage, since the dust generated at this time is relatively small and the concentration index does not meet the warning requirements of the sensor 9, the air flow rate in the second air duct 6-1 can be reduced, and there is no need for too much gas to enter the dust suction pipe 6, which reduces the energy consumption of the air pump. However, after the discharge is completed, a large amount of dust will inevitably be generated during the stirring process of the stirring shaft 3, and a large amount of gas will be needed to enter the dust removal pipe to suck away the dust inside the mixing drum 1. At this time, the rubber membrane 6-2 can adjust the ventilation volume of the second air duct 6-1 at any time according to the pressure difference between the first air duct 5 and the second air duct 6-1.

[0048] S3: Then add silica fume, suspension powder, defoaming powder, expansion powder and stabilizer into the mixing drum 1 in sequence. When the added materials are pumped from the first pipe into the mixing drum 1, they are transported to the middle layer of the cement for stirring. Stir for 15 minutes. The gas flow rate at the pipe outlet is less than the settling rate of the dust in the stirring device.

[0049] S4: The powdered mortar formed after the stirring is completed is discharged from the discharge pipe, and the discharged mortar is packaged, with 4 kg of mortar being packed as one bag.

[0050] The specific implementation process is as follows:

[0051] When grouting material needs to be prepared, the materials mixed to form the grouting material are placed in the powder box respectively. At this time, the air pump connected to the first air channel 5 is started to pump cement into the mixing drum 1. After the cement is pumped, the stone powder and other materials are pumped into the mixing drum 1 in turn for stirring. During the process of pumping the materials, the motor 7 is always in the started state, continuously driving the stirring shaft 3 to rotate, and stirring the materials in the mixing drum 1.

[0052] During the stirring process, the sensor 9 is always in working condition. When the dust concentration in the mixing drum 1 is relatively high, the air pump connected to the second air channel 6-1 is started and provides a large flow of air into the second air channel 6-1 to suck away the dust in the mixing drum 1.

[0053] Example 2: Different from the above-mentioned Example 1, the materials in step S1 are: 720 parts of cement, 200 parts of stone powder, 15 parts of silica fume, 2 parts of powder water reducer, 0.1 parts of defoaming powder, 0.1 parts of expansion powder, and 2 parts of stabilizer.

[0054] Example 3: The difference from Example 1 is that in step S1, the materials are: 760 parts of cement, 230 parts of stone powder, 25 parts of silica fume, 3 parts of powder water reducer, 0.5 parts of defoaming powder, 0.5 parts of expansion powder, and 6 parts of stabilizer.

[0055] The above is only an embodiment of the present invention, and the common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for preparing a grouting material, characterized in that: The steps include: S1: Prepare the following materials by mass: 720-760 parts of cement, 200-230 parts of stone powder, 15-25 parts of silica fume, 2-3 parts of powder water reducer, 0.1-0.5 parts of defoaming powder, 0.1-0.5 parts of expansion powder, and 2-6 parts of stabilizer; S2: Place cement and stone powder into the mixing device in sequence and mix them evenly for 5-10 minutes. Use a pipe to introduce cement and stone powder into the bottom of the mixing device. The gas at the pipe outlet will suspend the materials at the bottom 2 / 3 of the mixing device. S3: Then, the silicon powder, suspension powder, defoaming powder, expansion powder and stabilizer in step S1 are sequentially introduced into the stirring device through the pipeline and stirred for 15 to 20 minutes. The gas flow rate at the pipeline outlet is less than the settling rate of the dust in the stirring device. S4: taking out the powdered pressed slurry formed after the stirring is completed and packaging it; In the S2 step, the stirring device is a stirring drum, and a discharge port for discharging materials is installed at the bottom end of the stirring drum, and a rotatable stirring shaft is vertically installed inside the stirring drum, and the stirring shaft extends to the lower part of the stirring drum. The interior of the stirring shaft is hollow, and a first air duct for transporting materials is vertically installed inside the stirring shaft. At the same time, a second air duct for dust removal is arranged on the periphery of the first air duct, and the outlet end of the second air duct is horizontally rotated and connected to a dust suction pipe for absorbing dust. A sensor for detecting dust concentration is installed on the top of the interior of the stirring drum, and a powder box for separately storing materials for preparing slurry is placed on the outside of the stirring drum, and the powder box is connected to the first air duct; the top of the first air duct extends vertically toward the top of the stirring drum and is connected to the powder box for placing pumped materials, and a pin for fixing the first air duct is horizontally installed between the first air duct and the second air duct, and a rubber membrane for controlling the air intake of the second air duct is evenly arranged on the contact part between the first air duct and the second air duct.

2. The method for preparing a grouting material according to claim 1, wherein: The dust suction pipe is symmetrically arranged on both sides of the rotation center of the stirring shaft. The dust suction pipe is connected to the stirring shaft by a rotary joint. Suction heads for absorbing dust are evenly distributed laterally at the bottom of the dust suction pipe.

3. The method for preparing a grouting material according to claim 1, wherein: The first air channel and the second air channel are respectively connected to two separate variable frequency air pumps, and the first air channel extends laterally toward the outside of the mixing drum.

4. The method for preparing a grouting material according to claim 1, wherein: A frame is fixedly installed on the periphery of the mixing drum, and a bracket is horizontally installed on the top of the frame. A motor for driving the mixing shaft to rotate is fixedly installed on the bracket. The output shaft of the motor is vertically downward, and a driving gear is connected to the output shaft of the motor, and the driving gear is meshed with the top of the mixing shaft.

5. The method for preparing a grouting material according to claim 1, wherein: Stirring rollers are installed laterally on the middle and outer sides of the bottom of the stirring shaft. The stirring rollers are arranged radially along the rotation center of the stirring shaft. The stirring rollers are composed of a fixed rod and a telescopic rod. The telescopic rod is sleeved inside the fixed rod.

Images