CN114108710A - Real-time monitoring system and method for key parameter of grouting after large-diameter cast-in-place pile combination - Google Patents
Real-time monitoring system and method for key parameter of grouting after large-diameter cast-in-place pile combination Download PDFInfo
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- CN114108710A CN114108710A CN202111193874.XA CN202111193874A CN114108710A CN 114108710 A CN114108710 A CN 114108710A CN 202111193874 A CN202111193874 A CN 202111193874A CN 114108710 A CN114108710 A CN 114108710A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
Abstract
The invention discloses a real-time monitoring system and a real-time monitoring method for grouting key parameters after combination of a large-diameter cast-in-place pile. Utilize the check valve to realize controllable slip casting under the low pressure operating mode, utilize electromagnetic flowmeter and pressure sensor to carry out real-time supervision to the mud jacking key parameter of grout outlet department to carry out dynamic mud jacking parameter adjustment according to operating condition. The invention can effectively solve the problems that the grouting parameters of the large-diameter cast-in-place pile are difficult to accurately determine in real time and are interfered by human factors; the grouting reliability is ensured by accurately monitoring and dynamically adjusting the grouting parameters at the grout outlet; by recording and uploading the real-time data and accumulating the standard test data by an informatization means, the subsequent big data analysis of the grouting parameters in the grouting engineering is facilitated.
Description
Technical Field
The invention relates to the technical field of pile foundation grouting processes, in particular to a system and a method for monitoring grouting key parameters of a large-diameter cast-in-place pile after combination.
Background
The pile foundation post grouting technology is an engineering technology with strong practicability and wide application range, is widely applied to various fields of underground buildings, bridges, subways, tunnels, power transmission tower foundations, offshore wind power and the like, and is mainly used for enhancing the strength and the rigidity of rock-soil bodies and improving the stability and the bearing capacity of the rock-soil bodies. At present, the domestic cast-in-place pile mainly adopts a post-grouting technology to overcome the defects of the construction process, improve the bearing capacity of a pile foundation and reduce the settlement, so that the pile length can be optimally designed, and the construction cost is saved. Because the post grouting project is a hidden project, the construction quality and the grouting effect are often difficult to visually check, the actual operation needs to be analyzed and evaluated by means of the grouting parameter change in the construction process, and the grouting parameter is a key parameter for determining the effective diffusion range of the pile foundation grouting slurry. At present, the selection of the grouting parameter size in the pile foundation grouting process is usually determined by construction experience, and the determined grouting parameter size is an actual measurement value of a ground grouting pump pressure gauge, but the grouting parameter loss condition in the pile foundation grouting process needs to be considered in actual engineering, because the pressure, flow and flow rate of grout at a grout outlet are generally smaller than the actual measurement value of the ground grouting pump pressure gauge. However, a unified standard is not formed yet for accurately calculating grouting parameters of a grout outlet, and the reason is that a pile foundation grouting parameter testing device is laggard and empirical values are greatly interfered by human factors, so that real-time and dynamic monitoring of grouting parameters in the pile foundation post-grouting construction process is very important for controlling the grouting effect.
In the field of pile foundation mud jacking reinforcement under complicated environmental conditions such as super thick soft soil stratum, abundant groundwater, mud jacking monitoring facilities and technique are still comparatively laggard, still adopt grouting pump manometer monitoring and artifical reading record to the slip casting parameter at present, do not have the device that the specialty was used for pile foundation mud jacking monitoring slip casting parameter size, and the human factor has certain interference to the pile foundation mud jacking to lead to back mud jacking technology to promote and receive the restriction. Therefore, it is important to provide a high-precision, high-efficiency and intelligent testing device capable of determining the size of the pile foundation grouting parameters.
In the existing post grouting process, a grout outlet of a traditional grouting device is wrapped by a rubber ring, a drawing pin is inserted into the rubber ring to block the grout outlet, the grouting device is placed at a preset position along with the lowering of a steel reinforcement cage, and high-pressure plugging is performed by injecting clear water before the grouting process is implemented. However, in the grouting process, stones existing in concrete and sediments can scratch the outer rubber ring, so that the non-return failure is caused, the slurry enters the traditional grouting head, and the grouting pipe is blocked. In addition, because the high-pressure plug opening is carried out on the grout outlet by using clear water before grouting is needed, one more process is needed, the construction cost is increased, the soil strength near the grout outlet can be damaged, and the concrete of the pile body after being poured shortly can be damaged to a certain extent.
Therefore, it is desired to solve the above problems.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a real-time monitoring system and a real-time monitoring method for key grouting parameters after large-diameter cast-in-place pile combination.
In order to achieve the above purposes, the invention provides a real-time monitoring system for grouting key parameters after combination of a large-diameter cast-in-place pile, which comprises a reinforcement cage, wherein the system comprises a pile side ring pipe grouting device fixed on the outer side of the reinforcement cage, a pile end inverted T-shaped grouting device fixed at the bottom of the reinforcement cage, a vertical grouting guide pipe, a corrugated pipe, a data line arranged in the corrugated pipe, a line integrator, a data acquisition instrument and grouting equipment;
the grouting equipment comprises a stirring and storing device, a grouting pump, a grout distributor and a grout conveying pipe, wherein the stirring and storing device is connected with the grout distributor through the grout conveying pipe, the grouting pump is arranged on the grout conveying pipe, and the grout distributor is connected with the top end of the vertical grouting guide pipe through the grout inlet pipe;
the data acquisition instrument is respectively connected with the stirring and slurry storing device, the grouting pump and the slurry distributor and is used for acquiring the slurry flow of the stirring and slurry storing device, the slurry outlet pressure of the grouting pump and the uniform distribution of the grouting pressure value and the slurry flow of the slurry distributor;
the pile side ring pipe grouting device comprises an annular grouting guide pipe, a first tee joint, a second tee joint and a pile side grouting device arranged on the annular grouting guide pipe; the annular grouting guide pipe is communicated with the vertical grouting guide pipe through a first tee joint; the pile side grouting device is communicated with the annular grouting guide pipe through a second tee joint and consists of a first guide pipe, a first electromagnetic flowmeter, a first pressure sensor and a first check valve, wherein the first electromagnetic flowmeter, the first pressure sensor and the first check valve are arranged on the first guide pipe;
the pile-end inverted-T-shaped grouting device comprises a third tee joint and a pile-end grouting device; the pile-end grouting device consists of a second guide pipe, a second electromagnetic flowmeter and a second pressure sensor which are arranged on the vertical grouting guide pipe, and a second check valve arranged on the second guide pipe; one end of the third tee joint is connected with the tail end of the vertical grouting conduit to form an inverted T shape, and the other two ends of the third tee joint are respectively connected with a second conduit;
the first electromagnetic flowmeter, the second electromagnetic flowmeter, the first pressure sensor and the second pressure sensor are respectively connected with the line integrator through data lines, the line integrator is connected with the data acquisition instrument, and the data acquisition instrument acquires the slurry flow, the flow rate and the slurry outlet pressure at the slurry outlet, which are monitored by the first electromagnetic flowmeter, the second electromagnetic flowmeter and the first pressure sensor in real time.
Further: and a plurality of pile side grouting devices are uniformly distributed on the annular grouting guide pipe.
Further: and a plurality of pile end inverted T-shaped grouting devices are uniformly distributed at the bottom of the reinforcement cage.
Further: in the pile side mud jacking device, a first electromagnetic flowmeter, a first pressure sensor and a first check valve are arranged on a first guide pipe in sequence from inside to outside; in the pile end grouting device, a second electromagnetic flowmeter and a second pressure sensor are arranged on a vertical grouting guide pipe from top to bottom.
Further: and the corrugated pipe is bound along the reinforcement cage.
The method for monitoring the key grouting parameters in real time after the large-diameter cast-in-place pile is combined based on the device comprises the following steps:
(1) in the process of binding the reinforcement cage, installing a pile side ring pipe grouting device at the outer side of the reinforcement cage according to the actual spacing distance requirement, and installing a pile end inverted T-shaped grouting device at the bottom of the reinforcement cage;
(2) a data line is inserted into a corrugated pipe bound along the reinforcement cage, one end of the data line is connected with a data acquisition instrument, and the other end of the data line is connected with an electromagnetic flowmeter or a pressure sensor;
(3) hoisting a reinforcement cage with a pile side ring pipe grouting device and a pile end inverted T-shaped grouting device to a pile position, and performing pile forming operation;
(4) pouring underwater concrete to form a pile for 12-24 hours, and then opening and plugging a pile side ring pipe grouting device and a pile end inverted T-shaped grouting device by using clear water to ensure that a grouting pipeline is smooth;
(5) after the strength of the pile body concrete meets the requirement, post-grouting construction is carried out on the pile foundation, grouting is carried out on all vertical grouting guide pipes through a grout distributor, and corresponding preset values are set for grouting parameters of all the vertical grouting guide pipes, so that the grouting parameters in the grouting process of all the vertical grouting guide pipes are ensured to be uniformly distributed; wherein the grouting parameters comprise the flow rate, the flow speed and the slurry outlet pressure of the slurry;
(6) the electromagnetic flowmeter and the pressure sensor are utilized in the pile foundation grouting process, the slurry pressure value, the slurry flow and the slurry flow speed at the slurry outlet are obtained in real time, and the data acquisition instrument displays and stores the values.
Further: the method also comprises the step of adjusting grouting parameters by acquiring the pressure, flow and flow velocity of the slurry at the slurry outlet in real time. Grouting process control: when the total slurry amount does not reach the design value, adjusting the slurry flow rate to be more than 1.2 times of the design value; when the grouting pressure is lower than or higher than the design value for a long time, adjusting the designed value of the grout flow which is more than 1.2-1.5 times of the grout flow after intermittent grouting (the intermittent grouting refers to that when the grouting pressure is difficult to meet the actual condition, the grouting is stopped for a period of time and then re-grouting is carried out); grouting termination control: when the total amount of the slurry reaches the design value, adjusting the slurry pressure to reach the design value of the grouting pressure and maintaining the stabilization time for not less than 5 minutes; when the total slurry amount is larger than the design value of 80%, adjusting the slurry pressure to be larger than the designed grouting pressure value of 1.2 times and maintaining the stable time to be not less than 5 minutes.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
1) according to the invention, the electromagnetic flowmeter and the pressure sensor are arranged on the grouting device, so that the problems that the size of a grouting parameter in the pile foundation grouting process is difficult to accurately determine and is interfered by human factors are solved, the obtained grouting parameter can provide a basis for parameter adjustment, accurate and effective grouting is realized, and the grouting reliability is ensured;
2) the invention can obtain the pressure value, the flow value and the flow velocity value of the slurry at the slurry outlet in real time by utilizing the pressure sensor and the electromagnetic flowmeter, can form a unified standard for the accurate calculation of the grouting parameters of the slurry outlet, and provides reference and guidance;
3) according to the invention, the check valve is preset in the grouting device, so that the construction process of removing the clear water and opening the plug at high pressure can be simplified, the construction waste is reduced, the damage of high-pressure water flow to soil bodies and pile foundations is avoided, and the grouting operation under a low-pressure working condition can be realized;
4) according to the invention, the pile side ring pipe mud jacking devices are uniformly arranged on the pile side, so that the cement grout extruded from the pile side can fully cover and wrap the whole pile side surface, and the integral side resistance of the pile foundation can be enhanced;
5) the inverted-T-shaped pile-end grouting device can enable the pile-end grouting device to be horizontally placed in the sediment at the bottom of the pile, is favorable for enlarging the combination range of cement slurry and the sediment, improves the solidification area of the sediment at the pile end, and ensures the qualified rate of a grouting process;
6) the grout distributor can be connected to all grouting pipe openings of a single pile at the same time, so that pile ends and pile sides are simultaneously grouted, grouting at the pile ends can be more uniform effectively, and grouting time is shortened;
7) the invention has simple process, convenient operation, safety, reliability, economy, applicability, suitability for installation on a construction site and convenient popularization and application.
Drawings
FIG. 1 is a schematic structural diagram of a system for monitoring key parameters of grouting after a large-diameter cast-in-place pile is assembled according to the present invention in real time;
FIG. 2 is a schematic structural view of a pile-side collar grouting device provided by the invention;
FIG. 3 is a top view of a pile side collar grouting device provided by the present invention;
FIG. 4 is an enlarged partial view of the pile side collar grouting apparatus provided by the present invention;
FIG. 5 is an enlarged view of a portion of the inverted T-shaped grouting device provided in the invention;
FIG. 6 is a flow chart of a method of operation of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1, the real-time monitoring system for key grouting parameters after combination of a large-diameter cast-in-place pile comprises a pile side ring pipe grouting device 2 fixed on the outer side of a reinforcement cage 1, a pile end inverted T-shaped grouting device 3 fixed at the bottom of the reinforcement cage 1, a vertical grouting guide pipe 4, a corrugated pipe 5, a data line 12 arranged in the corrugated pipe 5, a line integrator 6, a data acquisition instrument 7, a background processor 10 and grouting equipment 19.
The grouting equipment 19 comprises a stirring and slurry storing device 11, a grouting pump 9, a slurry distributor 8 and a slurry conveying pipe 18; the stirring and slurry storing device 11 is connected with a slurry distributor 8 through a slurry conveying pipe 18, the slurry pressing pump 9 is arranged on the slurry conveying pipe 18, and the slurry distributor 8 is connected with the top end of the vertical slurry pressing guide pipe 4 through a slurry inlet pipe 13. The data acquisition instrument 7 is respectively connected with the stirring and slurry storage device 11, the grouting pump 9 and the slurry distributor 8 and is used for acquiring the slurry flow of the stirring and slurry storage device, the slurry outlet pressure of the grouting pump and the slurry distributor for uniformly distributing the grouting pressure value and the slurry flow. The relevant data (surface data) are collected for comparison with the data collected at the pile side and the pile end grout outlet position, and the difference between the surface position and the actual grout outlet position can be further researched, so that the parameter loss of grout in the grout conveying pipe can be deeply studied.
As shown in fig. 2, 3 and 4, the pile-side collar grouting device 2 is composed of an annular grouting guide pipe 202, a tee joint 17, and a pile-side grouting press 201 provided on the annular grouting guide pipe 202. The annular grouting guide pipe 202 is communicated with the vertical grouting guide pipe 4 through a three-way joint 17; the pile-side grouting device 201 is communicated with the annular grouting guide pipe 202 through a three-way joint 17, the pile-side grouting device 201 comprises a guide pipe 20101, an electromagnetic flow meter 14, a pressure sensor 15 and a check valve 16, the electromagnetic flow meter 14, the pressure sensor 15 and the check valve 16 are arranged on the guide pipe 20101, one end of the guide pipe 20101 is connected with the three-way joint 17, and the other end of the guide pipe 20101 faces the outer side of the reinforcement cage 1.
Further, pile side mud jacking ware 201 stretches out steel reinforcement cage lateral part and is no less than 3cm to set up 8mm diameter's slip casting hole on the pile side mud jacking ware, annotate the check valve that is equipped with anti-clogging member in it. The pile side ring pipe mud jacking device is uniformly arranged on the pile side, so that cement grout extruded from the pile side can fully cover and wrap the whole pile side surface, and the whole pile side resistance of a pile foundation is favorably enhanced.
Further, the pile side ring pipe grouting devices are generally arranged according to the length of the pile, and a group of pile side ring pipe grouting devices are generally arranged along the pile body at an interval of 15m from top to bottom. The pile side ring pipe grouting device can be correspondingly adjusted according to the design or the actual engineering situation.
As shown in fig. 5, the pile-end inverted T-shaped grouting device 3 is composed of a tee joint 17 and a pile-end grouting device 301, wherein the pile-end grouting device 301 is composed of a conduit 30101, an electromagnetic flow meter 14 and a pressure sensor 15 which are arranged on a vertical grouting conduit 4, and a check valve 16 arranged on the conduit 30101; one end of the three-way joint 17 is connected with the tail end of the vertical grouting pipe 4 to form an inverted T shape, and the other two ends are respectively connected with one pipe 30101.
Further, pile end mud jacking ware 301 of the device stretches out 1 bottom of steel reinforcement cage and is no less than 5cm to set up the slip casting hole of 8mm diameter on the pile end mud jacking ware, the slip casting hole is arranged the form and is plum blossom shape and is equipped with the check valve of preventing blocking up spare in it. The inverted-T-shaped pile-end grouting device can enable the pile-end grouting device to be horizontally placed in the pile bottom sediment, is favorable for enlarging the combination range of cement slurry and sediment, improves the solidification area of the pile-end sediment, and ensures the qualified rate of a grouting process.
Further, the pile end inverse T-shaped grouting devices are generally arranged according to the size of the pile diameter, and when D is less than 1200mm, 2 pile end inverse T-shaped grouting devices are arranged; when D is more than or equal to 1200mm and less than or equal to 2500mm, arranging 3 pile end inverted T-shaped grouting devices; when D is larger than 2500mm, 4 pile end inverted T-shaped grouting devices are arranged. The pile end inverted T-shaped grouting device can be correspondingly adjusted according to the design or the actual engineering situation.
Monitoring the slurry parameter change at the slurry outlet by using the electromagnetic flow meter 14 and the pressure sensor 15 in the pile side slurry pressing device 201 and the pile end slurry pressing device 301; the pile side ring pipe grouting devices 2 are uniformly arranged on the whole reinforcement cage according to actual interval requirements; the inverted T-shaped pile-end grouting devices 3 are uniformly arranged at the bottom of the pile, at least 3 grouting devices are arranged, and the number of the pile-end grouting devices can be increased or decreased according to the size of the pile diameter. The electromagnetic flowmeter 14 and the pressure sensor 15 are connected with the line integrator 6 through the transmission line 12, the line integrator 6 is connected with the data acquisition instrument 7, the data acquisition instrument 7 is used for monitoring and storing the dynamic change of key grouting parameters in real time, and the dynamic change is transmitted to the background processor 10. The background processor 10 obtains grouting parameters at the earth surface and grouting parameters at the grout outlet obtained in real time by using the stirring and grout storing device 11, the grouting pump 9 and the grout distributor 8 and adjusts the grouting parameters in time according to test data results to realize accurate and effective grouting, and meanwhile, the loss change condition of the grouting parameters of the large-diameter cast-in-place pile in a grouting pipeline can be researched, so that reference and guidance are provided for forming a unified standard for accurate calculation of the grouting parameters at the grout outlet of the large-diameter cast-in-place pile, and test data are accumulated.
Preferably, the electromagnetic flowmeter 14 in the present invention can be selected from a high-precision electromagnetic flowmeter, a high-precision acoustic flowmeter or a high-precision turbine flowmeter; the pressure sensor 15 in the present invention may be a flexible film pressure sensor or a resistance type pressure sensor.
Preferably, one end of the grout distributor 8 of the present invention is connected to all the vertical grouting pipes 4 through a plurality of grout inlet pipes 13, and the other end is connected to the grouting device 19 through a grout conveying pipe 18, and the grout distributor 8 has the functions of pressure stabilization and pressure regulation, so as to ensure that grouting parameters of each single grouting pipe are uniformly distributed. The grout distributor 8 can be connected to all grouting pipe openings of a single pile at the same time, so that pile ends and pile sides can be grouted at the same time, grouting at the pile ends can be more uniform effectively, and grouting time is shortened.
The invention can utilize a high-precision, high-efficiency and intelligent testing device capable of determining the size of the pile foundation grouting parameter to dynamically monitor the grouting parameter of the pile foundation grouting process, accurately give the size of the pile foundation grouting process grouting parameter, accurately master the condition of the pressed stratum, quickly evaluate the grouting effect, further reasonably change the grouting pressure parameter and enable the grouting construction to be more reasonably and effectively carried out; the device innovatively adopts an advanced sensing technology, has the advantages of high precision, strong anti-interference performance, water resistance, pressure resistance and the like, measures data accurately in real time, and can effectively ensure the accuracy of the data. The invention solves the problems of accurate determination of grouting parameter in the pile foundation grouting process and interference of human factors, and the obtained accurate grouting parameter can provide basis for parameter adjustment, thereby realizing accurate and effective grouting and ensuring the grouting reliability.
As shown in fig. 6, the invention discloses a working method of a real-time monitoring system for grouting key parameters after combination of large-diameter cast-in-place piles, which comprises the following steps:
(1) in the binding process of the reinforcement cage 1, a pile side ring pipe grouting device 2 and a pile end inverted T-shaped grouting device 3 are arranged on the inner side of the reinforcement cage 1, and an electromagnetic flowmeter 14, a pressure sensor 15 and a check valve 16 are arranged in the pile side ring pipe grouting device 2 and the pile end inverted T-shaped grouting device 3;
(2) uniformly arranging the pile side ring pipe grouting devices 2 along the whole reinforcement cage 1 from top to bottom;
(3) hoisting a reinforcement cage 1 with a pile side ring pipe grouting device 2 and a pile end inverted T-shaped grouting device 3 to a pile position, and performing pile forming operation;
(4) after pouring underwater concrete to form a pile for 12-24 hours, opening the plug of the inverted T-shaped grouting device 2 at the pile end by using clear water, and ensuring the grouting pipeline to be smooth;
(5) after the strength of the pile body concrete meets the requirement, post-grouting construction is carried out on the pile foundation, a grout delivery pipe is simultaneously connected with all vertical grouting guide pipes through a grout distributor, and corresponding preset values are set for grouting parameters of each single pipe, so that the grouting parameters in the grouting process of each single pipe are ensured to be uniformly distributed;
(6) in the pile foundation grouting process, an electromagnetic flow meter and a pressure sensor are used for acquiring the pressure value, the flow rate and the flow velocity of the grout at a grout outlet in real time, a data acquisition instrument displays, transmits and stores grouting parameter data, and grouting parameters of grouting pipes are dynamically adjusted according to the field condition;
(7) adjusting the grouting parameters in time according to the real-time variation data of the grouting parameters: grouting process control: when the total slurry amount does not reach the design value, adjusting the slurry flow rate to be more than 1.2 times of the design value; when the grouting pressure is lower than or higher than the design value for a long time, adjusting the design value of the grout flow which is 1.2-1.5 times larger than the grout flow after intermittent grouting; grouting termination control: when the total amount of the slurry reaches the design value, adjusting the slurry pressure to reach the design value of the grouting pressure and maintaining the stabilization time for not less than 5 minutes; when the total slurry amount is larger than the design value of 80%, adjusting the slurry pressure to be larger than the designed grouting pressure value of 1.2 times and maintaining the stable time to be not less than 5 minutes. The total amount of the grout (grouting amount) is the amount of the injected cement grout, and the actual amount of the cement grout (grouting amount) can be obtained through conversion of the grout flow and the grout flow rate which are obtained in real time by a computer (background cloud server). The key parameters of pile foundation grouting are grouting pressure and the amount of grouting cement, so that the two key parameters need to be controlled, and grouting effect and quality are ensured.
The normal grouting construction sequence is that the pile side is grouted firstly, the pile end is grouted secondly, and the pile side is grouted firstly and then downwards (a plurality of ring pipes are arranged along the reinforcement cage). The invention completes the grouting of a plurality of pile sides and pile ends at one time through the grout distributor, saves more time compared with the traditional method, and greatly improves the grouting efficiency. However, the method also has a corresponding problem, because the positions of the sides and the ends of the multiple piles are different, and the involved soil layers are different (the cement grout consumption required by different soil layers is different), so that the required grouting pressure and the grouting amount are different, the method needs to solve the problem through a grout distributor, the corresponding grouting pressure and the corresponding grouting amount are preset for the sides and the ends of the multiple piles through a computer (a background cloud server), and a data acquisition instrument is used for acquiring data in real time to adjust parameters in the grouting process.
The high-precision, high-efficiency and intelligent testing device capable of determining the size of the pile foundation grouting parameter effectively solves the problems that the size of the pile foundation grouting parameter is accurately determined in the pile foundation grouting process and is interfered by human factors, and grouting parameter can be adjusted through the obtained accurate grouting parameter, so that the grouting reliability is ensured; by utilizing the electromagnetic flowmeter and the pressure value of the grout outlet of the pressure sensor, the loss change condition of the grouting parameters of the pile foundation in the grouting pipeline can be researched, and reference and guidance are provided for forming a unified standard for accurate calculation of the grouting parameters of the grout outlet; the grouting parameter size testing device for the pile foundation grouting process has the advantages of simple structure, suitability for installation in a construction site, convenience for popularization and application, simple material taking, installation and use by professional technicians in the construction site, synchronization with the pile forming process, and effective saving of engineering progress, so that the grouting parameter size testing device is convenient for popularization and use.
While the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that various modifications can be made to the embodiments and can be applied to other embodiments without inventive faculty. In summary, the present invention is not limited to the above embodiments, and any improvements and modifications made according to the design concept of the present invention are within the protection scope of the present invention.
Claims (7)
1. The utility model provides a real-time monitoring system of mud jacking key parameter after major diameter bored concrete pile makes up, bored concrete pile includes steel reinforcement cage (1), its characterized in that: the system comprises a pile side ring pipe grouting device (2) fixed on the outer side of a reinforcement cage (1), a pile end inverted T-shaped grouting device (3) fixed at the bottom of the reinforcement cage (1), a vertical grouting guide pipe (4), a corrugated pipe (5), a data line (12) arranged in the corrugated pipe (5), a circuit integrator (6), a data acquisition instrument (7) and grouting equipment (19);
the grouting equipment (19) comprises a stirring and slurry storing device (11), a grouting pump (9), a slurry distributor (8) and a slurry conveying pipe (18), wherein the stirring and slurry storing device (11) is connected with the slurry distributor (8) through the slurry conveying pipe (18), the grouting pump (9) is arranged on the slurry conveying pipe (18), and the slurry distributor (8) is connected with the top end of the vertical grouting guide pipe (4) through a slurry inlet pipe (13);
the data acquisition instrument (7) is respectively connected with the stirring and slurry storing device (11), the grouting pump (9) and the slurry distributor (8) and is used for acquiring the slurry flow of the stirring and slurry storing device, the slurry outlet pressure of the grouting pump and the uniform distribution of the grouting pressure value and the slurry flow of the slurry distributor;
the pile side ring pipe grouting device (2) comprises an annular grouting guide pipe (202), a first tee joint, a second tee joint (17) and a pile side grouting device (201) arranged on the annular grouting guide pipe (202); the annular grouting guide pipe (202) is communicated with the vertical grouting guide pipe (4) through a first tee joint (17); the pile-side grouting device (201) is communicated with the annular grouting guide pipe (202) through a second three-way joint (17), the pile-side grouting device (201) is composed of a first guide pipe (20101), a first electromagnetic flow meter (14), a first pressure sensor (15) and a first check valve (16), wherein the first electromagnetic flow meter (14), the first pressure sensor and the first check valve are arranged on the first guide pipe (20101), one end of the first guide pipe (20101) is connected with the second three-way joint (17), and the other end of the first guide pipe faces the outer side of the reinforcement cage (1);
the pile-end inverted-T-shaped grouting device (3) comprises a third tee joint (17) and a pile-end grouting device (301); the pile-end grouting device (301) consists of a second guide pipe (30101), a second electromagnetic flow meter (14) and a second pressure sensor (15) which are arranged on the vertical grouting guide pipe (4), and a second check valve (16) which is arranged on the second guide pipe (30101); one end of the third three-way joint (17) is connected with the tail end of the vertical grouting conduit (4) to form an inverted T shape, and the other two ends of the third three-way joint are respectively connected with a second conduit (30101);
the slurry outlet device is characterized in that the first electromagnetic flowmeter (14), the second electromagnetic flowmeter (14), the first pressure sensor (15) and the second pressure sensor (15) are respectively connected with the line integrator (6) through data lines (12), the line integrator (6) is connected with the data acquisition instrument (7), and the data acquisition instrument (7) acquires the slurry flow, the flow rate and the slurry outlet pressure of the slurry outlet which are monitored by the first electromagnetic flowmeter (14), the second electromagnetic flowmeter (14), the first pressure sensor (15) and the second pressure sensor (15) in real time.
2. The real-time monitoring system for key parameters of mud jacking after the combination of the large-diameter cast-in-place pile, according to claim 1, is characterized in that: and a plurality of pile side grouting devices (201) are uniformly distributed on the annular grouting guide pipe (202).
3. The real-time monitoring system for key parameters of mud jacking after the combination of the large-diameter cast-in-place pile, according to claim 1, is characterized in that: and a plurality of pile end inverted T-shaped grouting devices (3) are uniformly distributed at the bottom of the reinforcement cage (1).
4. The real-time monitoring system for key parameters of mud jacking after the combination of the large-diameter cast-in-place pile, according to claim 1, is characterized in that: in the pile-side grouting device (201), a first electromagnetic flowmeter (14), a first pressure sensor (15) and a first check valve (16) are arranged on a first guide pipe in sequence from inside to outside; in the pile end grouting device (301), a second electromagnetic flowmeter (14) and a second pressure sensor (15) are arranged on the vertical grouting guide pipe (4) from top to bottom in sequence.
5. The real-time monitoring system for key parameters of mud jacking after the combination of the large-diameter cast-in-place pile, according to claim 1, is characterized in that: the corrugated pipe (5) is bound along the reinforcement cage (1).
6. The method for monitoring the key grouting parameters of the large-diameter cast-in-place pile after combination by using the device according to any one of claims 1 to 5, is characterized by comprising the following steps of:
(1) in the binding process of the reinforcement cage (1), the pile side ring pipe grouting device (2) is installed on the outer side of the reinforcement cage (1) according to the actual spacing distance requirement, and the pile end inverted T-shaped grouting device (3) is installed at the bottom of the reinforcement cage;
(2) a data line (12) is inserted into a corrugated pipe (5) bound along the reinforcement cage (1), one end of the data line (12) is connected with a data acquisition instrument (7), and the other end of the data line is connected with an electromagnetic flowmeter (14) or a pressure sensor (15);
(3) hoisting a reinforcement cage (1) with a pile side ring pipe grouting device (2) and a pile end inverted T-shaped grouting device (3) to a pile position, and performing pile forming operation;
(4) pouring underwater concrete to form a pile for 12-24 hours, and then opening and plugging the pile side ring pipe grouting device (2) and the pile end inverted T-shaped grouting device (3) by using clear water to ensure that a grouting pipeline is smooth;
(5) after the strength of the pile body concrete meets the requirement, post grouting construction is carried out on the pile foundation, grouting is carried out on all vertical grouting guide pipes (4) through a grout distributor (8), and corresponding preset values are set for grouting parameters of all the vertical grouting guide pipes (4), so that the grouting parameters of the grouting process of all the vertical grouting guide pipes (4) are ensured to be uniformly distributed; wherein the grouting parameters comprise the flow rate, the flow speed and the slurry outlet pressure of the slurry;
(6) the electromagnetic flow meter (14) and the pressure sensor (15) are utilized in the pile foundation grouting process, the slurry pressure value, the slurry flow and the slurry flow speed at the slurry outlet are obtained in real time, and the data acquisition instrument (7) is used for displaying and storing the data.
7. The method of claim 6, wherein: the method also comprises the step of adjusting grouting parameters by acquiring the pressure, flow and flow velocity of the slurry at the slurry outlet in real time. Grouting process control: when the total slurry amount does not reach the design value, adjusting the slurry flow rate to be more than 1.2 times of the design value; when the grouting pressure is lower than or higher than the design value for a long time, adjusting the design value of the grout flow which is 1.2-1.5 times larger than the grout flow after intermittent grouting; grouting termination control: when the total amount of the slurry reaches the design value, adjusting the slurry pressure to reach the design value of the grouting pressure and maintaining the stabilization time for not less than 5 minutes; when the total slurry amount is larger than the design value of 80%, adjusting the slurry pressure to be larger than the designed grouting pressure value of 1.2 times and maintaining the stable time to be not less than 5 minutes.
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