A self-locking anti-back-grouting semi-grouting sleeve and grouting construction method thereof

Abstract

The present invention relates to the technical field of grouting, and in particular to a self-locking anti-back-grouting semi-grouting sleeve and a grouting construction method thereof, the method comprising: adding water to the mixed dry mixture and stirring to output a grouting material mixture, pouring the grouting material mixture into a grouting bucket, connecting the grouting bucket with an air compressor using a vent pipe; pressurizing the grouting bucket by adjusting the air intake valve of the air compressor, and conveying the grouting material mixture to the semi-grouting sleeve; when the grouting material mixture flows out from the grouting hole of the semi-grouting sleeve without bubbles, using a rubber plug to block the grouting hole, maintaining the pressure of the semi-grouting sleeve and then removing the rubber plug; determining the corresponding valve opening of the air intake valve based on the variance of the flow rate of the grouting material mixture; determining the corresponding injection rate of the grouting material mixture based on the proportion of the bubble existence time of the sleeve grouting hole. The present invention achieves the improvement of grouting stability.

Description

Technical Field

[0001] The invention relates to the technical field of grouting, and in particular to a self-locking anti-back-grouting semi-grouting sleeve and a grouting construction method thereof. Background Art

[0002] In the prior art, from the development trend of the global construction industry, the development of the construction industry towards prefabrication has become a general trend. The wide application of steel bar connection grouting sleeves in prefabricated concrete components has greatly improved the efficiency of construction, and also saved a lot of time and labor costs. The traditional steel bar connection grouting sleeve has the following problems: (1) The traditional steel bar connection grouting sleeve is to block both ends of the sleeve and then grout. This operation is very likely to cause the grouting material to be loose or back-slurry, which will affect the overall strength of the sleeve connection. (2) The traditional steel bar connection grouting sleeve is to fix and limit the steel bar through the sealing gasket at the end of the sleeve. This operation is very likely to cause the steel bar inside the sleeve to deviate. This situation will also affect the overall strength of the sleeve connection. (3) After the grouting body of the traditional steel bar connection grouting sleeve is hardened and formed, it is easy to crack due to shrinkage creep and other effects. (4) The force connecting the steel bar and the sleeve of the traditional steel bar connection grouting sleeve is mainly transmitted through the grouting body.

[0003] Chinese Patent Publication No.: CN109296135A discloses a semi-grouting sleeve grouting construction method, comprising the following steps: S1, connecting a sleeve with a grouting port and a grouting hole to a lower component, performing grouting, and forming a grouting layer at the lower end of the sleeve to seal the lower end of the sleeve; S2, connecting the sleeve to an upper component, and cleaning the grouting port and the grouting hole of the sleeve, wherein the grouting port and the grouting hole of the sleeve are both equipped with valves; S3, blowing out moisture and impurities in the sleeve by high-pressure air; S4, connecting a vacuum pump to the grouting hole, and connecting a pressure grouting machine to the pressure grouting machine; Connected to the grouting port; S5, close the valve of the grouting port, open the valve of the slurry outlet, start the vacuum pump, so that the vacuum pump performs vacuum suction on the sleeve through the slurry outlet, and when the negative pressure in the sleeve reaches a predetermined threshold, turn off the vacuum pump, and remove the vacuum pump from the slurry outlet; S6, open the valve of the grouting port, start the pressure grouting machine, so that the pressure grouting machine performs grouting on the sleeve through the grouting port until the sleeve is filled with slurry, and maintain the pressure for a certain period of time; S7, turn off the pressure grouting machine. It can be seen from this that the semi-grouting sleeve grouting construction method has the problem that the piston sealing ring in the air compressor is worn due to long-term operation, resulting in poor cylinder sealing, which in turn leads to a decrease in air pressure, causing the flow rate of the grouting mixture to decrease, resulting in a decrease in the stability of grouting. Summary of the invention

[0004] To this end, the present invention provides a self-locking anti-backflow semi-grouting sleeve and a grouting construction method thereof, so as to overcome the problem in the prior art that the piston sealing ring in the air compressor is worn due to long-term operation, resulting in poor cylinder sealing, and then causing the air pressure to decrease, so that the flow rate of the grouting material mixture decreases and the stability of the grouting is reduced.

[0005] To achieve the above-mentioned purpose, the present invention provides a grouting construction method of a self-locking anti-back-grouting semi-grouting sleeve, comprising: adding water to the mixed dry mixture and stirring to output a grouting material mixture, pouring the grouting material mixture into a grouting bucket, and connecting the grouting bucket with an air compressor using a vent pipe; pressurizing the grouting bucket by adjusting the air inlet valve of the air compressor to transport the grouting material mixture into the semi-grouting sleeve; when the grouting material mixture flows out of the grouting hole of the semi-grouting sleeve without bubbles, using a rubber plug to block the grouting hole, maintaining the pressure of the semi-grouting sleeve, and then removing the rubber plug; using a flow sensor to collect the flow rate of the grouting material mixture in several grouting cycles; The corresponding valve opening of the air inlet valve is determined based on the variance of the flow rate of the grouting mixture, or the bubble content of the grouting mixture in the sleeve is determined according to the variance of the flow rate of the grouting mixture; when it is determined that the bubble content of the grouting mixture in the sleeve does not meet the requirements, the bubble existence time of the sleeve outlet hole per unit time is obtained, and the corresponding injection rate of the grouting mixture is determined based on the proportion of the bubble existence time of the sleeve outlet hole, or the corresponding length of the grouting pipe is determined based on the proportion of the bubble existence time of the sleeve outlet hole and the average interval time of the grouting mixture entering and exiting the sleeve; wherein the grouting mixture is transported to the semi-grouting sleeve through the grouting pipe at the output end of the grouting barrel.

[0006] Furthermore, the step of determining the corresponding valve opening of the intake valve further includes determining whether the stability of the grouting meets the requirements based on the variance of the flow rate of the grouting material mixture;

[0007] If the variance of the flow rate of the grouting material mixture satisfies the first variance condition or the second variance condition, it is determined that the stability of the grouting does not meet the requirements;

[0008] If the variance of the flow rate of the grouting material mixture only meets the first variance condition, it is preliminarily determined that the bubble content of the grouting material mixture in the sleeve does not meet the requirements, and a secondary determination is made on whether the bubble content of the grouting material mixture in the sleeve meets the requirements according to the proportion of the bubble existence time of the sleeve slurry outlet hole;

[0009] If the variance of the flow rate of the grouting material mixture only satisfies the second variance condition, controlling the air inlet valve to pressurize the grouting barrel according to the corresponding valve opening;

[0010] Among them, the first variance condition is that the variance of the flow rate of the grouting mixture is greater than the preset first variance and less than or equal to the preset second variance; the second variance condition is that the variance of the flow rate of the grouting mixture is greater than the preset second variance.

[0011] Furthermore, the corresponding valve opening is determined by the difference between the variance of the flow rate of the grouting material mixture and a preset second variance.

[0012] Further, the step of determining the corresponding injection rate of the grouting material mixture includes:

[0013] Obtain the existence time of the bubbles in the sleeve slurry outlet hole, and calculate the proportion of the existence time of the bubbles in the sleeve slurry outlet hole;

[0014] The bubble existence time ratio of the sleeve slurry outlet hole is compared with the preset first ratio and the preset second ratio respectively;

[0015] If the proportion of the bubble existence time of the sleeve grout outlet hole is greater than the preset first proportion, it is determined that the bubble content of the grouting material mixture in the sleeve does not meet the requirements;

[0016] If the proportion of the bubble existence time of the sleeve grouting hole is greater than the preset first proportion and less than or equal to the preset second proportion, it is determined that the bubble content of the grouting material mixture in the sleeve does not meet the requirements, and the grouting pipe is controlled to transport the grouting material mixture according to the corresponding injection rate;

[0017] If the proportion of the duration of the bubbles in the sleeve outlet hole is greater than the preset second proportion, it is preliminarily determined that the sealing of the grouting barrel does not meet the requirements, and a secondary judgment is made on whether the sealing of the grouting barrel meets the requirements based on the average interval time of the grouting material mixture entering and exiting the sleeve.

[0018] Furthermore, the corresponding injection rate is determined by the difference between the proportion of the bubble existence time in the sleeve slurry outlet and a preset first proportion.

[0019] Further, the step of determining the corresponding length of the grouting pipe includes:

[0020] Obtain the interval time of the grouting material mixture entering and exiting the sleeve in several grouting cycles, and calculate the average interval time of the grouting material mixture entering and exiting the sleeve;

[0021] Comparing the average interval time of the grouting material mixture entering and exiting the sleeve with the preset interval time;

[0022] If the average interval time of the grouting mixture entering and exiting the sleeve is greater than the preset interval time, it is determined for the second time that the sealing of the grouting barrel does not meet the requirements, and the grouting pipe is controlled to transport the grouting mixture according to the corresponding length.

[0023] Furthermore, the calculation formula for the average interval time of the grouting material mixture entering and exiting the sleeve is:

[0024]

[0025] Among them, Z is the average interval time of the grouting mixture entering and exiting the sleeve, X a is the interval time of the grouting mixture entering and exiting the sleeve in the ath grouting cycle, n is the number of grouting cycles, and n is a natural number greater than or equal to 1.

[0026] Furthermore, the corresponding length is determined by the difference between the average interval time of the grouting material mixture entering and exiting the sleeve and the preset interval time.

[0027] Furthermore, the present invention also provides a self-locking anti-backflow semi-grouting sleeve, comprising:

[0028] Cylinder;

[0029] An anti-backflow module is arranged inside the cylinder, comprising a self-locking anti-backflow flap arranged inside the cylinder to prevent the grouting material mixture from flowing back, and a self-locking anti-backflow flap pin arranged on the inner wall of the cylinder to fix the position of the self-locking anti-backflow flap;

[0030] A grouting module connected to the cylinder, comprising a grouting inlet for providing a passage for injecting the grouting mixture and a grouting outlet for providing a passage for flowing out the grouting mixture;

[0031] The fixing module is connected to the cylinder and includes a fixing module arranged at the bottom of the cylinder for fixing the cylinder.

[0032] Furthermore, before grouting, the self-locking anti-back-grouting flap is closed only under the action of its own weight; during grouting, the self-locking anti-back-grouting flap opens due to the impact of grouting; after grouting is completed, the self-locking anti-back-grouting flap closes again under the action of its own gravity and the gravity of the grouting material mixture.

[0033] Compared with the prior art, the beneficial effect of the present invention lies in that the method of the present invention adjusts the valve opening of the air intake valve according to the variance of the flow rate of the grouting material mixture. Due to the wear of the piston sealing ring in the air compressor due to long-term operation, the cylinder seal is poor, which in turn causes the air pressure to weaken, resulting in a decrease in the flow rate of the grouting material mixture. By increasing the opening of the air intake valve, the influence of the reduction in air intake pressure due to the failure of the air compressor is reduced. By adjusting the injection rate of the grouting material mixture according to the proportion of the bubble existence time of the sleeve outlet hole, due to the protrusions on the surface of the steel bar, there is a gap at the connection between the steel bar and the bottom of the sleeve, resulting in a small amount of air in the process of grouting into the sleeve. The air enters the sleeve at the bottom of the sleeve and mixes with the grouting mixture before being discharged from the slurry outlet, resulting in an increase in the duration of bubbles at the slurry outlet. By reducing the injection rate of the grouting mixture, the air entering from the bottom is fully mixed with the grouting mixture and then discharged into the air above with the flow of the grouting mixture, thereby reducing the bubbles in the grouting mixture. By adjusting the length of the grouting pipe according to the average interval time of the grouting mixture entering and exiting the sleeve, the sealing effect is reduced due to material aging of the sealing ring of the grouting barrel, thereby increasing the grouting time into the sleeve. By reducing the length of the grouting pipe, the loss of flow pressure of the grouting mixture is reduced, thereby improving the stability of grouting.

[0034] Furthermore, the method of the present invention adjusts the valve opening of the intake valve by setting a preset first variance and a preset second variance. Due to the wear of the piston sealing ring in the air compressor due to long-term operation, the cylinder seal is poor, which in turn causes the air pressure to weaken, resulting in a decrease in the flow rate of the grouting mixture. By increasing the opening of the intake valve, the impact of the reduction in intake pressure due to the failure of the air compressor is reduced, thereby further achieving an improvement in the stability of the grouting.

[0035] Furthermore, the method of the present invention adjusts the injection rate of the grouting mixture by setting a preset first ratio and a preset second ratio. Since there are protrusions on the surface of the steel bar, there is a gap at the connection between the steel bar and the bottom of the sleeve, resulting in a small amount of air entering the sleeve at the bottom of the sleeve during grouting and mixing with the grouting mixture before being discharged from the slurry outlet, resulting in an increase in the duration of bubbles appearing at the slurry outlet. By reducing the injection rate of the grouting mixture, the air entering from the bottom is fully mixed with the grouting mixture and then discharged into the air above as the grouting mixture flows, thereby reducing the bubbles in the grouting mixture and further achieving improved stability of the grouting.

[0036] Furthermore, the method of the present invention adjusts the length of the grouting pipe by setting a preset interval time. Due to material aging of the sealing ring of the grouting barrel, the sealing effect is reduced, which leads to an increase in the grouting time into the sleeve. By reducing the length of the grouting pipe, the loss of flow pressure of the grouting material mixture is reduced, thereby further achieving an improvement in the stability of the grouting. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is an overall flow chart of the self-locking anti-back-grouting semi-grouting sleeve grouting construction method according to an embodiment of the present invention;

[0038] Figure 2 It is a schematic diagram of the overall structure of a self-locking anti-back-grouting semi-grouting sleeve according to an embodiment of the present invention;

[0039] Figure 3 A specific flow chart of the process of determining the corresponding injection rate of the grouting material mixture in the self-locking anti-back-grouting semi-grouting sleeve grouting construction method according to an embodiment of the present invention;

[0040] Figure 4 A specific flow chart of the process of determining the corresponding length of the grouting pipe in the self-locking anti-back-grouting semi-grouting sleeve grouting construction method according to an embodiment of the present invention;

[0041] The accompanying drawings are marked as follows: 1-air compressor, 2-ventilation pipe, 3-air inlet valve, 4-grouting barrel, 5-slurry outlet hole, 6-fixed end steel bar, 7-mechanical connection port, 8-self-locking anti-backflow flap, 9-self-locking anti-backflow flap pin, 10-cylinder body, 11-connecting steel bar, 12-sealing ring, 13-slurry inlet hole, 14-grouting pipe, 15-electric telescopic rod, 16-hoop. DETAILED DESCRIPTION

[0042] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0044] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0045] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively an overall flow chart of the grouting construction method of the self-locking anti-backflow semi-grouting sleeve according to an embodiment of the present invention, an overall structural schematic diagram, a specific flow chart of the process of determining the corresponding injection rate of the grouting material mixture, and a specific flow chart of the process of determining the corresponding length of the grouting pipe. A grouting construction method of a self-locking anti-backflow semi-grouting sleeve according to the present invention comprises:

[0047] Step S1, adding water to the mixed dry mixture and stirring to output a grouting material mixture, pouring the grouting material mixture into a grouting bucket 4, and connecting the grouting bucket 4 to the air compressor 1 using a vent pipe 2;

[0048] Step S2, pressurizing the grouting barrel 4 by adjusting the air inlet valve 3 of the air compressor 1, and conveying the grouting material mixture into the semi-grouting sleeve;

[0049] Step S3, when the grouting material mixture flows out from the grouting hole 5 of the semi-grouting sleeve without bubbles, the grouting hole 5 is sealed with a rubber plug, and the semi-grouting sleeve is pressure-maintained and then the rubber plug is removed;

[0050] Step S4, using a flow sensor to collect the flow rate of the grouting material mixture during several grouting cycles;

[0051] Step S5, determining the corresponding valve opening of the air inlet valve 3 based on the variance of the flow rate of the grouting material mixture, or determining the bubble content of the grouting material mixture in the sleeve according to the variance of the flow rate of the grouting material mixture;

[0052] Step S6, when it is determined that the bubble content of the grouting material mixture in the sleeve does not meet the requirements, the bubble existence time of the sleeve outlet hole 5 per unit time is obtained, and the corresponding injection rate of the grouting material mixture is determined based on the bubble existence time ratio of the sleeve outlet hole 5, or the corresponding length of the grouting pipe 14 is determined based on the bubble existence time ratio of the sleeve outlet hole 5 and the average interval time of the grouting material mixture entering and exiting the sleeve;

[0053] The grouting material mixture is transported to the semi-grouting sleeve through the grouting pipe 14 at the output end of the grouting barrel 4.

[0054] Specifically, the ingredients of dry mix include cement, fine aggregate, high-efficiency water reducing agent and waterproofing agent.

[0055] Specifically, the method for adjusting the length of the grouting pipe 14 is as follows: the electric telescopic rod 15 connected to the grouting barrel 4 adjusts the length of the grouting pipe 14 by changing the telescopic length, wherein the hoop 16 is sleeved on the grouting pipe 14 to drive the grouting pipe 14 to telescope.

[0056] Specifically, the material of the grouting pipe 14 can be an elastic rubber pipe, a stainless steel corrugated pipe, or a fiber reinforced plastic pipe, and the preferred embodiment is an elastic rubber pipe.

[0057] Specifically, the pressure maintaining process is as follows: after the slurry is discharged from the slurry holes 5 of all the semi-grouting sleeves and sealed, lower the pressure of the air compressor 1, start pressure maintaining at a pressure of 0.1 MPa, and maintain pressure for 1 minute. During the pressure maintaining period, randomly pull out the rubber plugs of a few slurry outlet holes 5. When it is observed that the grouting material is gushing out from the slurry outlet holes 5, quickly seal them again. After pressure maintaining, pull out the grouting pipe 14. The time interval from pulling out the grouting pipe 14 to sealing the rubber plug shall not exceed 1 second to prevent the slurry in the grouting bin from overflowing from the grouting bin after pressure maintaining, resulting in inaccurate grouting.

[0058] In implementation, the method of the present invention adjusts the valve opening of the air intake valve 3 according to the variance of the flow rate of the grouting mixture. Due to the wear of the piston sealing ring in the air compressor 1 due to long-term operation, the cylinder seal is poor, which in turn causes the air pressure to weaken, resulting in a decrease in the flow rate of the grouting mixture. By increasing the opening of the air intake valve 3, the impact of the reduction in intake pressure due to the failure of the air compressor 1 is reduced. The injection rate of the grouting mixture is adjusted according to the proportion of the bubble existence time of the sleeve slurry outlet 5. Due to the protrusions on the surface of the steel bar, there is a gap at the connection between the steel bar and the bottom of the sleeve, resulting in a small amount of air entering the sleeve at the bottom of the sleeve during the grouting process. After mixing with the grouting mixture, it is discharged from the slurry outlet hole 5, resulting in an increase in the duration of bubbles appearing at the slurry outlet 5. By reducing the injection rate of the grouting mixture, the air entering from the bottom is fully mixed with the grouting mixture and then discharged into the air above with the flow of the grouting mixture, thereby reducing the bubbles in the grouting mixture. By adjusting the length of the grouting pipe 14 according to the average interval time of the grouting mixture entering and exiting the sleeve, the sealing effect is reduced due to material aging of the sealing ring 12 of the grouting barrel 4, thereby increasing the grouting time into the sleeve. By reducing the length of the grouting pipe 14, the loss of flow pressure of the grouting mixture is reduced, thereby achieving an improvement in the stability of grouting.

[0059] Specifically, the step of determining the corresponding valve opening of the intake valve 3 further includes determining whether the stability of the grouting meets the requirements based on the variance of the flow rate of the grouting material mixture;

[0060] If the variance of the flow rate of the grouting material mixture satisfies the first variance condition or the second variance condition, it is determined that the stability of the grouting does not meet the requirements;

[0061] If the variance of the flow rate of the grouting material mixture only meets the first variance condition, it is preliminarily determined that the bubble content of the grouting material mixture in the sleeve does not meet the requirements, and a secondary determination is made on whether the bubble content of the grouting material mixture in the sleeve meets the requirements according to the proportion of the bubble existence time of the sleeve slurry outlet hole 5;

[0062] If the variance of the flow rate of the grouting material mixture only satisfies the second variance condition, the air inlet valve 3 is controlled to pressurize the grouting barrel 4 according to the corresponding valve opening;

[0063] Among them, the first variance condition is that the variance of the flow rate of the grouting mixture is greater than the preset first variance and less than or equal to the preset second variance; the second variance condition is that the variance of the flow rate of the grouting mixture is greater than the preset second variance.

[0064] It can be understood that the three intervals corresponding to the preset first variance and the preset second variance correspond to three situations respectively. The first situation is that the variance of the flow rate of the grouting mixture is less than or equal to the preset first variance, and the stability of the grouting meets the requirements; the second situation is that the variance of the flow rate of the grouting mixture is greater than the preset first variance and less than or equal to the preset second variance, and it is preliminarily determined that the bubble content of the grouting mixture in the sleeve does not meet the requirements, and a secondary judgment is made on whether the bubble content of the grouting mixture in the sleeve meets the requirements based on the proportion of the bubble existence time of the sleeve slurry hole 5; the third situation is that the variance of the flow rate of the grouting mixture is greater than the preset second variance, and the air inlet valve 3 is controlled to pressurize the grouting barrel 4 according to the corresponding valve opening. In practice, the preset first variance is generally selected in the range of [9 (L / min) 2 , 11(L / min) 2 ), the preset second variance is generally selected in the range of [11(L / min) 2 , 13(L / min) 2 ], when the preset second variance selection value is less than 11 (L / min) 2When the air compressor 1 is in operation for a long time, the piston sealing ring is worn, resulting in poor cylinder sealing, which in turn causes the air pressure to decrease, causing the flow rate of the grouting material mixture to decrease. The situation where the grouting material mixture is connected to a gap due to the protrusions on the surface of the steel bar, resulting in a gap between the steel bar and the bottom of the sleeve, resulting in a small amount of air entering the sleeve at the bottom of the sleeve during the grouting process and mixing with the grouting material mixture before being discharged from the slurry outlet hole 5, resulting in an increase in the duration of bubbles at the slurry outlet hole 5. When the duration of bubbles increases, the proportion of the duration of bubbles in the sleeve slurry outlet hole 5 changes accordingly. The piston sealing ring in the air compressor 1 is worn due to long-term operation, resulting in poor cylinder sealing, which in turn causes the air pressure to decrease, causing the flow rate of the grouting material mixture to decrease. The impact is greater than the situation where the steel bar has a protrusion on the surface of the steel bar, resulting in a gap between the steel bar and the bottom of the sleeve, resulting in a small amount of air entering the sleeve at the bottom of the sleeve during the grouting process and mixing with the grouting material mixture before being discharged from the slurry outlet hole 5, causing the duration of bubbles at the slurry outlet hole 5 to increase.

[0065] Optionally, the preferred embodiment of the preset first variance Q1 is Q1=10 (L / min) 2 The preferred embodiment of the preset second variance Q2 is Q2=12 (L / min) 2 .

[0066] Specifically, the variance of the flow rate of the grouting material mixture is recorded as Q, and the difference between the variance of the flow rate of the grouting material mixture and the preset second variance is recorded as ΔQ, and ΔQ=Q-Q2 is set.

[0067] Specifically, the variance of the flow velocity of the grouting mixture is the variance of the flow velocity of the grouting mixture within several grouting cycles. The calculation method of the variance of the flow velocity of the grouting mixture is a conventional technical means well known to those skilled in the art, and therefore the calculation process of the variance of the flow velocity of the grouting mixture will not be repeated here.

[0068] In implementation, the method of the present invention determines the stability of grouting by setting a preset first variance and a preset second variance, thereby reducing the impact of reduced accuracy of grouting due to inaccurate determination of the stability of grouting, and further improving the stability of grouting.

[0069] Specifically, the corresponding valve opening is determined by the difference between the variance of the flow rate of the grouting material mixture and a preset second variance.

[0070] Specifically, the specific process of determining the corresponding valve opening by the difference between the variance of the flow rate of the grouting material mixture and the preset second variance is:

[0071] If △Q≤△Q0, the valve opening of the intake valve 3 is adjusted to the first valve opening using the preset first valve opening adjustment coefficient;

[0072] If ΔQ>ΔQ0, the valve opening of the intake valve 3 is adjusted to the second valve opening using the preset second valve opening adjustment coefficient;

[0073] Wherein, the preset first valve opening adjustment coefficient is smaller than the preset second valve opening adjustment coefficient.

[0074] Specifically, the corresponding valve opening includes a first valve opening and a second valve opening.

[0075] Optionally, the preferred embodiment of the preset variance difference ΔQ0 is ΔQ0=2 (L / min) 2 .

[0076] Specifically, the preset first valve opening adjustment coefficient is recorded as α1, and α1 is set to 1.2. The preset second valve opening adjustment coefficient is recorded as α2, and α2 is set to 1.4. The valve opening of the intake valve 3 is recorded as V, wherein 1<α1<α2. The corresponding valve opening is recorded as V', and V' is set to V×(1+αi) / 2, wherein αi is the preset i-th valve opening adjustment coefficient, and i is set to 1, 2.

[0077] In implementation, the method of the present invention adjusts the valve opening of the intake valve 3 by setting a preset first variance and a preset second variance. Since the piston sealing ring in the air compressor 1 is worn due to long-term operation, the cylinder seal is poor, which leads to a decrease in air pressure and a decrease in the flow rate of the grouting mixture. By increasing the opening of the intake valve 3, the impact of the reduction in intake pressure due to the failure of the air compressor 1 is reduced, and the stability of the grouting is further improved.

[0078] Specifically, the step of determining the corresponding injection rate of the grouting material mixture includes:

[0079] Obtain the existence time of the bubbles in the sleeve slurry outlet hole 5 per unit time, and calculate the proportion of the existence time of the bubbles in the sleeve slurry outlet hole 5;

[0080] The bubble existence time ratio of the sleeve slurry outlet hole 5 is compared with the preset first ratio and the preset second ratio respectively;

[0081] If the proportion of the bubble existence time of the sleeve grouting hole 5 is greater than the preset first proportion, it is determined that the bubble content of the grouting material mixture in the sleeve does not meet the requirements;

[0082] If the proportion of the bubble existence time of the sleeve grouting hole 5 is greater than the preset first proportion and less than or equal to the preset second proportion, it is determined that the bubble content of the grouting material mixture in the sleeve does not meet the requirements, and the grouting pipe 14 is controlled to transport the grouting material mixture according to the corresponding injection rate;

[0083] If the proportion of the duration of the bubbles in the sleeve slurry outlet hole 5 is greater than the preset second proportion, it is preliminarily determined that the sealing of the grouting barrel 4 does not meet the requirements, and a secondary judgment is made on whether the sealing of the grouting barrel 4 meets the requirements based on the average interval time of the grouting material mixture entering and exiting the sleeve.

[0084] It can be understood that the three intervals corresponding to the preset first proportion and the preset second proportion correspond to three situations respectively. The first situation is that the proportion of the duration of the bubble existence in the sleeve grouting hole 5 is less than or equal to the preset first proportion, and the bubble content of the grouting mixture in the sleeve meets the requirements; the second situation is that the proportion of the duration of the bubble existence in the sleeve grouting hole 5 is greater than the preset first proportion and less than or equal to the preset second proportion, and the grouting pipe 14 is controlled to transport the grouting mixture at the corresponding injection rate; the third situation is that the proportion of the duration of the bubble existence in the sleeve grouting hole 5 is greater than the preset second proportion, and it is preliminarily determined that the sealing of the grouting barrel 4 does not meet the requirements, and a secondary judgment is made on whether the sealing of the grouting barrel 4 meets the requirements based on the average interval time of the grouting mixture entering and exiting the sleeve. In practice, the preset first ratio is generally selected in the range of [3s, 5s], and the preset second ratio is generally selected in the range of (5s, 7s]. When the preset first ratio exceeds 5s, the corresponding influencing factors will change. For example, due to the aging of the sealing ring 12 of the grouting bucket 4, the sealing effect is reduced, which leads to an increase in the grouting time in the sleeve. When the grouting time in the sleeve increases, the average interval time of the grouting mixture entering and exiting the sleeve changes accordingly. Due to the protrusions on the surface of the steel bar, there is a gap at the connection between the steel bar and the bottom of the sleeve, resulting in a small amount of air entering the sleeve at the bottom of the sleeve during the grouting process and mixing with the grouting mixture and then discharged from the slurry outlet 5, resulting in a longer duration of bubbles appearing at the slurry outlet 5 than due to the aging of the sealing ring 12 of the grouting bucket 4, resulting in a decrease in the sealing effect, thereby increasing the grouting time in the sleeve.

[0085] Optionally, a preferred embodiment of the preset first proportion P1 is P1=4s, and a preferred embodiment of the preset second proportion P2 is P2=6s.

[0086] Specifically, the proportion of the bubble existence time in the sleeve slurry outlet hole 5 is recorded as P, and the difference between the proportion of the bubble existence time in the sleeve slurry outlet hole 5 and the preset first proportion is recorded as △P, and △P is set to be P-P1.

[0087] Specifically, the calculation formula for the proportion of the bubble existence time in the sleeve slurry outlet hole is:

[0088]

[0089] Among them, G is the proportion of the duration of bubbles existing in the sleeve slurry hole, K is the duration of bubbles existing in the sleeve slurry hole per unit time, and T is the total duration per unit time.

[0090] In implementation, the method of the present invention performs a secondary determination on the bubble content of the grouting mixture in the sleeve by setting a preset first ratio and a preset second ratio, thereby reducing the impact of the inaccurate secondary determination of the bubble content of the grouting mixture in the sleeve on the stability of the grouting, and further improving the stability of the grouting.

[0091] Specifically, the corresponding injection rate is determined by the difference between the proportion of the bubble existence time in the sleeve slurry outlet hole 5 and the preset first proportion.

[0092] Specifically, the specific process of determining the corresponding injection rate by the difference between the bubble existence time ratio of the sleeve slurry outlet hole 5 and the preset first ratio is:

[0093] If ΔP≤ΔP0, the injection rate of the grouting material mixture is adjusted to the first injection rate using the preset second injection rate adjustment coefficient;

[0094] If ΔP>ΔP0, the injection rate of the grouting material mixture is adjusted to a second injection rate using the preset first injection rate adjustment coefficient:

[0095] Wherein, the preset first injection rate adjustment coefficient is smaller than the preset second injection rate adjustment coefficient.

[0096] Specifically, the corresponding injection rate includes a first injection rate and a second injection rate.

[0097] Optionally, a preferred embodiment of the preset proportion difference ΔP0 is ΔP0=2s.

[0098] Specifically, the preset first injection rate adjustment coefficient is recorded as β1, and β1 is set to 0.8. The preset second injection rate adjustment coefficient is recorded as β2, and β2 is set to 0.9. The injection rate of the grouting mixture is recorded as H, wherein 0<β1<β2<1. The corresponding injection rate is recorded as H', and H' is set to H×(1+2βj) / 3, wherein βj is the preset jth injection rate adjustment coefficient, and j is set to 1, 2.

[0099] In implementation, the method of the present invention adjusts the injection rate of the grouting material mixture by setting a preset first ratio and a preset second ratio. Since there are protrusions on the surface of the steel bar, there is a gap at the connection between the steel bar and the bottom of the sleeve, resulting in a small amount of air entering the sleeve at the bottom of the sleeve during grouting and mixing with the grouting material mixture and then being discharged from the slurry outlet 5, resulting in an increase in the duration of bubbles appearing at the slurry outlet 5. By reducing the injection rate of the grouting material mixture, the air entering from the bottom is fully mixed with the grouting material mixture and then discharged into the air above with the flow of the grouting material mixture, thereby reducing the bubbles in the grouting material mixture and further achieving the improvement of the stability of the grouting.

[0100] Specifically, the steps of determining the corresponding length of the grouting pipe 14 include:

[0101] Obtain the interval time of the grouting material mixture entering and exiting the sleeve in several grouting cycles, and calculate the average interval time of the grouting material mixture entering and exiting the sleeve;

[0102] Comparing the average interval time of the grouting material mixture entering and exiting the sleeve with the preset interval time;

[0103] If the average interval time of the grouting mixture entering and exiting the sleeve is greater than the preset interval time, it is determined that the sealing performance of the grouting barrel 4 does not meet the requirements, and the grouting pipe 14 is controlled to transport the grouting mixture according to the corresponding length.

[0104] It can be understood that the preset interval time corresponds to two intervals, corresponding to two situations respectively. The first situation is that the average interval time of the grouting mixture entering and exiting the sleeve is less than or equal to the preset interval time, and the secondary judgment is that the sealing of the grouting barrel 4 meets the requirements; the second situation is that the average interval time of the grouting mixture entering and exiting the sleeve is greater than the preset interval time, and the grouting pipe 14 is controlled to transport the grouting mixture according to the corresponding length. In practice, the preset interval time is generally selected in the range of [9s, 11s]. When the preset interval time exceeds 11s, the corresponding influencing factors will change. For example, due to the aging of the material of the sealing ring 12 of the grouting barrel 4, the sealing effect is reduced, which leads to an increase in the time of grouting into the sleeve.

[0105] Optionally, a preferred embodiment of the preset interval duration Y0 is Y0=10s.

[0106] Specifically, the average interval time of the grouting mixture entering and exiting the sleeve is recorded as Y, and the difference between the average interval time of the grouting mixture entering and exiting the sleeve and the preset interval time is recorded as △Y, and △Y=Y-Y0 is set.

[0107] In implementation, the method of the present invention performs a secondary judgment on the sealing of the grouting bucket 4 by setting a preset interval time, thereby reducing the impact of the reduced stability of grouting due to inaccurate secondary judgment on the sealing of the grouting bucket 4, and further improving the stability of grouting.

[0108] Specifically, the calculation formula for the average interval time of the grouting mixture entering and exiting the sleeve is:

[0109]

[0110] Among them, Z is the average interval time of the grouting mixture entering and exiting the sleeve, X a is the interval time of the grouting mixture entering and exiting the sleeve in the ath grouting cycle, n is the number of grouting cycles, and n is a natural number greater than or equal to 1.

[0111] Specifically, the corresponding length is determined by the difference between the average interval time of the grouting material mixture entering and exiting the sleeve and the preset interval time.

[0112] Specifically, the specific process of determining the corresponding length by the difference between the average interval time of the grouting material mixture entering and exiting the sleeve and the preset interval time is as follows:

[0113] If △Y≤△Y0, the length of the grouting pipe 14 is adjusted to the first length using the preset second length adjustment coefficient;

[0114] If △Y>△Y0, the length of the grouting pipe 14 is adjusted to a second length using the preset first length adjustment coefficient;

[0115] Wherein, the preset first length adjustment coefficient is smaller than the preset second length adjustment coefficient.

[0116] Specifically, the corresponding length includes a first length and a second length.

[0117] Optionally, a preferred embodiment of the preset interval time difference △Y0 is △Y0=2s.

[0118] Specifically, the preset first length adjustment coefficient is recorded as γ1, and γ1 is set to 0.7. The preset second length adjustment coefficient is recorded as γ2, and γ2 is set to 0.8. The length of the grouting pipe 14 is recorded as L, wherein 0<γ1<γ2<1, and the corresponding length is recorded as L', and L'=L×(1+3γm) / 4, wherein γm is the preset mth length adjustment coefficient, and m is set to 1, 2.

[0119] In implementation, the method of the present invention adjusts the length of the grouting pipe 14 by setting a preset interval time. Due to material aging of the sealing ring 12 of the grouting barrel 4, the sealing effect is reduced, which leads to an increase in the grouting time into the sleeve. By reducing the length of the grouting pipe 14, the loss of flow pressure of the grouting material mixture is reduced, and the stability of the grouting is further improved.

[0120] Specifically, a self-locking anti-backflow semi-grouting sleeve comprises:

[0121] Cylinder 10;

[0122] The anti-backflow module is arranged inside the cylinder 10, and includes a self-locking anti-backflow flap 8 arranged inside the cylinder 10 to prevent the grouting material mixture from flowing back, and a self-locking anti-backflow flap pin 9 arranged on the inner wall of the cylinder 10 to fix the position of the self-locking anti-backflow flap 8;

[0123] A grouting module connected to the cylinder 10, comprising a grouting inlet 13 for providing a passage for injecting the grouting mixture and a grouting outlet 5 for providing a passage for outflowing the grouting mixture;

[0124] The fixing module is connected to the cylinder 10 , and includes a sealing ring 12 arranged at the bottom of the cylinder 10 for sealing the cylinder 10 and a mechanical connection port 7 arranged at the top of the cylinder 10 for fixing the spatial position of the cylinder 10 .

[0125] Specifically, the mechanical connection port 7 is connected to the upper fixed end steel bar 6, thereby fixing the spatial position of the semi-grouting sleeve.

[0126] Specifically, the connecting steel bar 11 is inserted from the middle of the sealing ring 12. During the insertion process, due to the action of external force, the self-locking anti-back-slurry flap 8 will open and close at a certain angle, so that the connecting steel bar 11 can be smoothly inserted into the sleeve. When the connecting steel bar 11 reaches the fixed position and stops inserting, the self-locking anti-back-slurry flap 8 will close and be fixed to the annular rib on the connecting steel bar 11 to prevent the connecting steel bar 11 from being pulled out.

[0127] Specifically, before grouting, the self-locking anti-back-grouting flap 8 is closed only under the action of its own weight; during grouting, the self-locking anti-back-grouting flap 8 opens due to the impact of grouting; after grouting is completed, the self-locking anti-back-grouting flap 8 closes again under the action of its own gravity and the gravity of the grouting material mixture.

[0128] Example 1

[0129] In this embodiment 1, the construction method of the self-locking anti-back-grouting semi-grouting sleeve is used to grout the semi-grouting sleeve, and the valve opening of the air intake valve is adjusted according to the difference between the variance of the flow rate of the grouting material mixture and the preset second variance, wherein the preset first valve opening adjustment coefficient is recorded as α1, the preset second valve opening adjustment coefficient is recorded as α2, and the valve opening of the air intake valve is recorded as V, wherein 1<α1<α2, α1=1.2 is set, α2=1.4 is set, △Q0=2(L / min) 2 , V = 0.4, Q = 15 (L / min) 2 , Q2=12(L / min) 2 , △Q=Q-Q2.

[0130] In this embodiment 1, ΔQ=3 (L / min) is obtained. 2 , determine ΔQ>ΔQ0 and use the preset first valve opening adjustment coefficient to adjust the opening of the intake valve to the second valve opening, and calculate V'=0.4×(1+1.2) / 2=0.44.

[0131] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A grouting construction method of a self-locking anti-backflow semi-grouting sleeve, characterized in that: include: Add water to the mixed dry mixture and stir to output a grouting material mixture, pour the grouting material mixture into a grouting bucket, and connect the grouting bucket to an air compressor using a vent pipe; The grouting barrel is pressurized by adjusting the air inlet valve of the air compressor to convey the grouting material mixture into the semi-grouting sleeve; When the grouting material mixture flows out from the grouting hole of the semi-grouting sleeve without bubbles, the grouting hole is sealed with a rubber plug, and the semi-grouting sleeve is pressure-maintained before the rubber plug is removed; Use flow sensors to collect the flow rate of the grouting mixture during several grouting cycles; Determining the corresponding valve opening of the air inlet valve based on the variance of the flow rate of the grouting mixture, or determining the bubble content of the grouting mixture in the sleeve based on the variance of the flow rate of the grouting mixture; When it is determined that the bubble content of the grouting material mixture in the sleeve does not meet the requirements, the existence time of the bubbles in the sleeve outlet hole per unit time is obtained, and the corresponding injection rate of the grouting material mixture is determined based on the proportion of the bubble existence time of the sleeve outlet hole, or the corresponding length of the grouting pipe is determined based on the proportion of the bubble existence time of the sleeve outlet hole and the average interval time of the grouting material mixture entering and exiting the sleeve; Wherein, the grouting material mixture is transported to the semi-grouting sleeve through the grouting pipe at the output end of the grouting barrel; The step of determining the corresponding valve opening of the intake valve further includes determining whether the stability of the grouting meets the requirements based on the variance of the flow rate of the grouting material mixture; If the variance of the flow rate of the grouting material mixture satisfies the first variance condition or the second variance condition, it is determined that the stability of the grouting does not meet the requirements; If the variance of the flow rate of the grouting material mixture only meets the first variance condition, it is preliminarily determined that the bubble content of the grouting material mixture in the sleeve does not meet the requirements, and a secondary determination is made on whether the bubble content of the grouting material mixture in the sleeve meets the requirements according to the proportion of the bubble existence time of the sleeve slurry outlet hole; If the variance of the flow rate of the grouting material mixture only satisfies the second variance condition, controlling the air inlet valve to pressurize the grouting barrel according to the corresponding valve opening; Wherein, the first variance condition is that the variance of the flow rate of the grouting material mixture is greater than the preset first variance and less than or equal to the preset second variance; the second variance condition is that the variance of the flow rate of the grouting material mixture is greater than the preset second variance; The corresponding valve opening is determined by the difference between the variance of the flow rate of the grouting material mixture and a preset second variance; The step of determining the corresponding injection rate of the grouting material mixture comprises: Obtain the duration of the bubble in the sleeve slurry outlet hole per unit time, and calculate the proportion of the bubble duration in the sleeve slurry outlet hole; The bubble existence time ratio of the sleeve slurry outlet hole is compared with the preset first ratio and the preset second ratio respectively; If the proportion of the bubble existence time of the sleeve grout outlet hole is greater than the preset first proportion, it is determined that the bubble content of the grouting material mixture in the sleeve does not meet the requirements; If the proportion of the bubble existence time of the sleeve grouting hole is greater than the preset first proportion and less than or equal to the preset second proportion, it is determined that the bubble content of the grouting material mixture in the sleeve does not meet the requirements, and the grouting pipe is controlled to transport the grouting material mixture according to the corresponding injection rate; If the proportion of the time when the bubbles in the grouting hole of the sleeve exist is greater than the preset second proportion, it is preliminarily determined that the sealing of the grouting barrel does not meet the requirements, and a secondary determination is made on whether the sealing of the grouting barrel meets the requirements based on the average interval time of the grouting material mixture entering and exiting the sleeve; The corresponding injection rate is determined by the difference between the proportion of the bubble existence time in the sleeve slurry outlet and the preset first proportion.

2. The grouting construction method of the self-locking anti-back-grouting semi-grouting sleeve according to claim 1 is characterized in that: The steps of determining the corresponding length of the grouting pipe include: Obtain the interval time of the grouting material mixture entering and exiting the sleeve in several grouting cycles, and calculate the average interval time of the grouting material mixture entering and exiting the sleeve; Comparing the average interval time of the grouting material mixture entering and exiting the sleeve with the preset interval time; If the average interval time of the grouting mixture entering and exiting the sleeve is greater than the preset interval time, it is determined for the second time that the sealing of the grouting barrel does not meet the requirements, and the grouting pipe is controlled to transport the grouting mixture according to the corresponding length.

3. The grouting construction method of the self-locking anti-back-grouting semi-grouting sleeve according to claim 2 is characterized in that: The calculation formula for the average interval time of the grouting mixture entering and exiting the sleeve is: Among them, Z is the average interval time of the grouting mixture entering and exiting the sleeve, X a is the interval time of the grouting mixture entering and exiting the sleeve in the ath grouting cycle, n is the number of grouting cycles, and n is a natural number greater than or equal to 1.

4. The grouting construction method of the self-locking anti-back-grouting semi-grouting sleeve according to claim 3 is characterized in that: The corresponding length is determined by the difference between the average interval time of the grouting material mixture entering and exiting the sleeve and the preset interval time.

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