A grouting construction method after concrete piles are grouted using a combined long screw pump
By carrying out combined long spiral pump press-poured concrete piles and grouting construction after the construction of the long spiral drill rig, the stability and bearing capacity of the long spiral drill rig during construction in gravel soil and other strata is solved, and efficient and environmentally friendly pile foundation construction is achieved.
Patent Information
- Application Number
- CN202411965003.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-04-08
AI Technical Summary
When constructing in gravel soil, soft rocks and weathered rocks, the long auger has problems such as collapsed holes, improper soil at the end of the pile, inaccurate positioning of the steel cage after the insertion, and insufficient stability requirements.
After the concrete pile is pressed into a combined long spiral pump, grouting is carried out through the grouting structure, and the water stopper is poured into the bottom of the pile by using a concrete pumper and a pure cement slurry pump to fill and compress the dense and loose parts, thereby improving the bearing capacity of the pile foundation.
This method is not limited by groundwater level and is suitable for a variety of formation conditions. It improves the bearing capacity and stability of the pile foundation, avoids the problems of collapsed holes, broken piles and neck shrinkage in traditional methods, and has high construction efficiency and low cost.
Smart Images
Figure CN119777380A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of grouting construction, and in particular to a grouting construction method after grouting concrete piles by using a combined long spiral pump. Background Art
[0002] In recent years, with the rapid development of social economy, domestic and foreign infrastructure construction has continued to heat up, and the construction industry has entered a period of rapid development. (Super) high-rise buildings in large and medium-sized cities are the trend, and foundation engineering is becoming more complex, difficult and specialized. With the development of diversified pile foundations, there are more and more pile-making equipment. Different equipment has different hole-making methods and matching pile-making processes. Long spiral drilling rigs have strong advantages in soft layers such as clay, loess, silt, and sand, but there is a certain degree of difficulty in construction in gravel soil, soft rock and weathered rock, and there are disadvantages such as easy collapse of holes below the groundwater level, difficulty in clearing the loose soil at the pile end, inaccurate positioning of the rear-inserted steel cage, and failure to meet subsequent stability requirements. Summary of the invention
[0003] The purpose of the present invention is to provide a grouting construction method after grouting concrete piles using a combined long spiral pump in order to solve the above problems, thereby solving the problems mentioned in the background technology.
[0004] In order to solve the above problems, the present invention provides a technical solution: A grouting construction method after grouting concrete piles using a combined long spiral pump, comprising a long spiral drilling machine, wherein the long spiral drilling machine is used for drilling holes, forming holes, and performing cast-in-place pile construction and underground continuous wall construction; A reinforced concrete bored pile is movably provided at the outer end of the long spiral drilling rig, a protective shell is fixedly installed at the outer end of the reinforced concrete bored pile, a transmission pipe is fixedly installed on one side of the long spiral drilling rig, a grouting structure is fixedly provided on one side of the transmission pipe, a forming structure is provided on one side of the transmission pipe, and a drill bit is fixedly installed on the bottom of the long spiral drilling rig.
[0005] As a preferred solution of the present invention, the interior of the grouting structure includes a concrete pump, which is located on one side of the transmission pipe, a pump hopper is fixedly installed on the top of the concrete pump, an S-tube is fixedly installed on one side of the pump hopper, a grouting device is fixedly installed on one side of the concrete pump, a pure cement slurry pump is fixedly installed on one side of the grouting device, and a pump pipe is fixedly installed on one side of the pure cement slurry pump.
[0006] As a preferred solution of the present invention, the interior of the forming structure mainly includes a vibration motor, the vibration motor is located on one side of the long spiral drill, a frequency converter is fixedly installed on one side of the vibration motor, and a pressure sensor is fixedly installed on one side of the reinforced concrete pile.
[0007] As a preferred solution of the present invention, the concrete pump is used to transport concrete to high, distant or difficult-to-reach places to meet the construction needs of various complex building structures. The grouting equipment uses mechanical power to increase the working pressure to more than 4500psi (300kg / cm²) within 3 to 6 seconds, and effectively injects liquid water-stopping agent into fine cracks of 0.1mm.
[0008] As a preferred embodiment of the present invention, the pure cement slurry pump is used to efficiently transport the prepared pure cement slurry to the place where construction is required, and its flow rate and pressure are adjustable to adapt to different construction requirements and geological conditions. The pure cement slurry pump transfers pure cement to the inside of the pump pipe.
[0009] As a preferred solution of the present invention, the vibration motor is used to convert electrical energy into mechanical energy, generate vibration force through the rotation of the motor, and obtain exciting force by utilizing the centrifugal force generated by the high-speed rotation of the shaft and the eccentric block. The frequency converter controls the AC motor by changing the working power frequency of the vibration motor. The pressure sensor is used to complete closed-loop control of the force and can withstand the uninterrupted pressure pulsation of the hydraulic pump and the impact under extreme working conditions.
[0010] As a preferred solution of the present invention, the model of the vibration motor is a YZS vibration motor, the model of the frequency converter is a WJ200 series, and the model of the pressure sensor is MSP330X.
[0011] As a preferred solution of the present invention, the specific process of grouting construction of reinforced concrete bored piles is as follows: The long spiral drill drills to the designed depth. According to the geological conditions of the project, the drill rod is lifted 25cm and kept in the original position without stopping drilling. When pumping superfluid concrete for the first time, it is advisable to open a Φ10cm hole at the top of the drill rod. During the pumping process, the gas in the pump pipe is discharged, and the superfluid concrete is pressed out from the bottom of the drill bit by a concrete pump. The drill bit is lifted while the concrete is pressed. The drill bit speed is preferably 1.5-2m / min. The concrete on the top of the pile is over-filled by 0-0.5m until the pile is formed, and then the pile is lowered by the self-weight method or a vibration auxiliary device. The steel cage with grouting pipe is inserted into the concrete pile body at one time to form a reinforced concrete bored pile. After 72 hours, a certain amount of cement slurry is injected into the pile bottom through the pre-buried grouting pipe. The cement slurry has the functions of filling, compacting and consolidating the soft part of the pile bottom, which can greatly improve the bearing capacity of the pile foundation. Then, after the soil around the pile is excavated to the designed elevation, a steel casing with a diameter of 1050mm is placed. The inner wall of the steel casing leaves a cavity of 4 to 6cm from the pile surface, thereby effectively isolating the pile body from the soil above the foundation bottom plate.
[0012] The beneficial effects of the present invention are: 1. This method is not limited by the groundwater level and can be used for pile foundations in clay soil, silt, sand, silty soil, plain fill soil, non-compacted gravel soil, strongly weathered rock and other strata with high groundwater levels and easy to collapse. It can be used for building (structure) foundation piles, foundation pit support piles, etc. 2. This method has good environmental protection effect, no noise, no vibration, no mud pollution and discharge, easy movement of operating machinery and equipment, little cross-influence on operations, no soil squeezing effect, and little disturbance to adjacent soil and buildings; 3. The long spiral drilling pressure pouring concrete of this construction method is under continuous pressure pumping, the pile body integrity is good, the pile body concrete is closely combined with the embedded soil layer, and there are no common quality defects of ordinary mud wall bored piles such as broken piles, neck shrinkage and bottom sediment; 4. This method adopts the post-grouting technology, which has the effect of penetrating and compacting the soil around and at the bottom of the pile, improving the resistance around and at the end of the pile, making the pile foundation have stronger bearing capacity, pull-out resistance and horizontal force resistance; 5. This method has a fast pile-forming speed; 6. Since the pile diameter is relatively small and the pile foundation has a high bearing capacity, the material consumption is small and the cost is low. The construction efficiency is high and the construction period is shortened; 7. Compared with traditional long spiral cast-in-place piles, there are no problems such as bottom cleaning, wall protection, hole collapse, etc., and it is not easy to cause problems such as broken piles and diameter shrinkage, and the pile body quality is reliable; 8. It has a wide range of applications. It can be used not only for the foundation piles of ordinary pile foundation projects, but also for CFG pile composite foundations and CM long and short pile composite foundations, and is more suitable for composite foundations. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] For ease of explanation, the present invention is described in detail with reference to the following specific implementations and the accompanying drawings.
[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the grouting structure of the present invention; Figure 3 It is a schematic diagram of the structure of the present invention.
[0015] In the figure: 1. long spiral drilling machine; 2. reinforced concrete bored pile; 3. protective shell; 4. grouting structure; 5. transmission pipe; 6. forming structure; 7. drill bit; 401. concrete pumping machine; 402. pump hopper; 403. S pipe; 404. grouting equipment; 405. pure cement slurry pump; 406. pump pipe; 601. vibration motor; 602. inverter; 603. pressure sensor. DETAILED DESCRIPTION
[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0017] Example 1 See also Figure 1-3 The present invention provides a technical solution: a grouting construction method after grouting concrete piles using a combined long spiral pump, comprising a long spiral drilling machine 1, the long spiral drilling machine 1 is used for drilling holes, forming holes, and performing cast-in-place pile construction and underground continuous wall construction; The outer end of the long spiral drill 1 is movably provided with a reinforced concrete pile 2, the outer end of the reinforced concrete pile 2 is fixedly provided with a protective shell 3, a transmission pipe 5 is fixedly provided on one side of the long spiral drill 1, a grouting structure 4 is fixedly provided on one side of the transmission pipe 5, a forming structure 6 is provided on one side of the transmission pipe 5, a drill bit 7 is fixedly provided on the bottom of the long spiral drill 1, the long spiral drill 1 drills a hole to the designed depth, according to the geological conditions of the project, the drill rod is lifted 25cm and kept in the original position without stopping drilling, mortar is first added to the pump hopper 402 to cushion the bottom of the glasses The lower edge of the plate suction port, then place S pipe 403 on the right side (concrete piston at the back), add pure cement slurry (water-cement ratio 0.45) to the left side of the hopper (concrete piston at the front), start pumping 3 strokes to pump the pure cement slurry pump 405 into the pump pipe 406. After pumping mortar for about 20 to 50 strokes, there is roughly 0.9 to 1m³ of mortar in the delivery pipe, and when there is half left in the pump hopper 402, concrete can be pumped for construction. The frequency of pumping concrete cannot be too fast at the beginning, and should be less than 10 times / minute, until the concrete is completely penetrated. When pumping superfluid concrete for the first time, it is advisable to first open a Φ10cm hole at the top section of the drill pipe, discharge the gas in the pump pipe 406 during the pumping process, use a concrete pump to press the superfluid concrete out from the bottom of the drill bit 7, and lift the drill bit 7 while pressing the concrete. The speed of the drill bit 7 is preferably 1.5-2m / min. The concrete on the top of the pile is over-filled by 0.4-0.5m until the pile is formed. Then, during the grouting process, a vibration auxiliary device can be used to improve the density of the concrete and the quality of the pile body. The vibration device makes the concrete more The concrete is then evenly compacted to reduce the gap between the hole wall and the concrete, thereby increasing the bearing capacity of the pile body and forming a reinforced concrete bored pile 2. After 72 hours, a certain amount of cement slurry is injected into the pile bottom through the pre-buried grouting pipe. The cement slurry has the functions of filling and compacting the soft part of the pile bottom, which can greatly increase the bearing capacity of the pile foundation. Then, after the soil around the pile is excavated to the designed elevation, a steel casing with a diameter of 1050 mm is placed. A cavity of 4 to 6 cm is left on the inner wall of the steel casing from the pile surface, thereby effectively isolating the pile body from the soil above the foundation bottom plate.
[0018] The interior of the forming structure 6 mainly includes a vibration motor 601, which is located on one side of the long spiral drill 1. A frequency converter 602 is fixedly installed on one side of the vibration motor 601, and a pressure sensor 603 is fixedly installed on one side of the reinforced concrete pile 2. The frequency converter 602 and the vibration motor 601 are electrically connected. By adjusting the frequency setting of the frequency converter 602, the vibration frequency of the vibration motor 601 can be changed in real time, thereby improving the vibration forming stability and strength of the pile. The interior of the grouting structure 4 includes a concrete pump 401, which is located on one side of the transmission pipe 5. A pump hopper 402 is fixedly installed on the top of the concrete pump 401, an S pipe 403 is fixedly installed on one side of the pump hopper 402, a grouting device 404 is fixedly installed on one side of the concrete pump 401, a pure cement slurry pump 405 is fixedly installed on one side of the grouting device 404, and a pump pipe 406 is fixedly installed on one side of the pure cement slurry pump 405.
[0019] During the grouting process, a vibration auxiliary device can be used to improve the density of the concrete and the quality of the pile. The vibration device makes the concrete more uniform and dense through vibration, reduces the gap between the hole wall and the concrete, and improves the bearing capacity of the pile. The pressure sensor 603 is used to monitor pressure changes and is electrically connected to the warning device of the console.
[0020] The concrete pump 401 is used to transport concrete to high, distant or hard-to-reach places to meet the construction needs of various complex building structures. The grouting equipment 404 uses mechanical power to increase the working pressure to more than 4500psi (300kg / cm²) within 3 to 6 seconds, and effectively injects liquid water-stopping agent into fine cracks of 0.1mm.
[0021] The pure cement slurry pump 405 is used to efficiently transport the prepared pure cement slurry to the place where construction is required. Its flow rate and pressure are adjustable to adapt to different construction requirements and geological conditions. The pure cement slurry pump 405 transfers pure cement to the inside of the pump pipe 406.
[0022] The vibration motor 601 is used to convert electrical energy into mechanical energy, generate vibration force through the rotation of the motor, and obtain exciting force by using the centrifugal force generated by the high-speed rotation of the shaft and the eccentric block. The frequency converter 602 controls the AC motor by changing the working power frequency of the vibration motor 601. The pressure sensor 603 is used to complete the closed-loop control of the force, and can withstand the uninterrupted pressure pulsation of the hydraulic pump and the impact under extreme working conditions.
[0023] The model of the vibration motor 601 is a YZS vibration motor, the model of the frequency converter 602 is a WJ200 series, and the model of the pressure sensor 603 is an MSP330X.
[0024] Specific process of reinforced concrete pile 2 grouting construction: The long spiral drill 1 drills a hole to the designed depth. According to the geological conditions of the project, the drill rod is lifted by 25 cm and kept in the original position without stopping drilling. When pumping superfluid concrete for the first time, it is advisable to first open a Φ10 cm hole at the top section of the drill rod. During the pumping process, the gas in the pump pipe 406 is discharged. The superfluid concrete is pressed out from the bottom of the drill bit 7 by using a concrete pump. The drill bit 7 is lifted while the concrete is pressed. The speed of the drill bit 7 is preferably 1.5 to 2 m / min. The concrete on the top of the pile is overfilled by 0.4 to 0.5 m until the pile is formed. Then, the pile is lowered by the self-weight sinking method or by using vibration assistance. The steel cage with a grouting pipe of the auxiliary device is inserted into the concrete pile body at one time to form a reinforced concrete bored pile 2. After 72 hours, a certain amount of cement slurry is injected into the pile bottom through the pre-buried grouting pipe. The cement slurry has the functions of filling and compacting the soft part of the pile bottom, which can greatly improve the bearing capacity of the pile foundation. Then, after the soil around the pile is excavated to the designed elevation, a steel casing with a diameter of 1050mm is placed. The inner wall of the steel casing leaves a cavity of 4 to 6cm from the pile surface, thereby effectively isolating the pile body from the soil within the range above the foundation bottom plate.
[0025] This construction method uses a high-strength long spiral drill to pump superfluid concrete piles, and then uses grouting equipment for grouting, combined with the construction method of steel casing technology, to replace the shortcomings of traditional long spiral cast-in-place piles, which can greatly improve the bearing capacity of the pile foundation, reduce the overall cost, ensure the construction progress and pile speed, and bring huge construction period benefits. Using the sand layer geological combination long spiral pump pressure concrete pile post-grouting construction method, the overall cost of this project can be reduced by 10% to 25%.
[0026] This construction method uses a high-strength long spiral drill to use pump-pressure superfluid concrete to pour piles, and then uses grouting equipment for grouting. It is combined with the construction method of steel casing technology to replace the shortcomings of traditional long spiral bored piles. It can greatly improve the bearing capacity of the pile foundation, with high hole-making efficiency, good quality, and short construction period, meeting the requirements of green energy conservation and environmental protection and subsequent stability.
[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A grouting construction method after grouting concrete piles using a combined long screw pump, characterized in that: It comprises a long spiral drilling machine (1), wherein the long spiral drilling machine (1) is used for drilling holes, forming holes, and performing cast-in-place pile construction and underground continuous wall construction; A reinforced concrete cast-in-place pile (2) is movably provided at the outer end of the long spiral drill (1), a protective housing (3) is fixedly installed at the outer end of the reinforced concrete cast-in-place pile (2), a transmission pipe (5) is fixedly installed on one side of the long spiral drill (1), a grouting structure (4) is fixedly provided on one side of the transmission pipe (5), a forming structure (6) is provided on one side of the transmission pipe (5), and a drill bit (7) is fixedly installed at the bottom of the long spiral drill (1).
2. A grouting construction method after grouting concrete piles using a combined long screw pump according to claim 1, characterized in that: The grouting structure (4) comprises a concrete pump (401) inside. The concrete pump (401) is located on one side of the transmission pipe (5). A pump hopper (402) is fixedly mounted on the top of the concrete pump (401). An S-tube (403) is fixedly mounted on one side of the pump hopper (402). A grouting device (404) is fixedly mounted on one side of the concrete pump (401). A pure cement slurry pump (405) is fixedly mounted on one side of the grouting device (404). A pump pipe (406) is fixedly mounted on one side of the pure cement slurry pump (405).
3. A grouting construction method after concrete pile grouting using a combined long screw pump according to claim 1, characterized in that: The interior of the forming structure (6) mainly includes a vibration motor (601), the vibration motor (601) is located on one side of the long spiral drilling machine (1), a frequency converter (602) is fixedly installed on one side of the vibration motor (601), and a pressure sensor (603) is fixedly installed on one side of the reinforced concrete cast-in-place pile (2).
4. A grouting construction method after grouting concrete piles using a combined long screw pump according to claim 2, characterized in that: The concrete pump (401) is used to transport concrete to high, distant or hard-to-reach places to meet the construction requirements of various complex building structures. The grouting equipment (404) uses mechanical power to increase the working pressure to more than 4500psi (300kg / cm²) within 3 to 6 seconds, and effectively injects liquid water-stopping agent into fine cracks of 0.1mm.
5. The grouting construction method after grouting concrete piles using a combined long screw pump according to claim 2 is characterized in that: The pure cement slurry pump (405) is used to efficiently transport the prepared pure cement slurry to the place where construction is required. Its flow rate and pressure are adjustable to adapt to different construction requirements and geological conditions. The pure cement slurry pump (405) transports pure cement to the inside of the pump pipe (406).
6. The grouting construction method after grouting concrete piles using a combined long screw pump according to claim 3 is characterized in that: The vibration motor (601) is used to convert electrical energy into mechanical energy, generate vibration force through the rotation of the motor, and obtain exciting force by utilizing the centrifugal force generated by the high-speed rotation of the shaft and the eccentric block. The frequency converter (602) controls the AC motor by changing the working power frequency of the vibration motor (601). The pressure sensor (603) is used to complete the closed-loop control of the force and can withstand the uninterrupted pressure pulsation of the hydraulic pump and the impact under extreme working conditions.
7. The grouting construction method after grouting concrete piles by using a combined long screw pump according to claim 3 is characterized in that: The model of the vibration motor (601) is a YZS vibration motor, the model of the frequency converter (602) is a WJ200 series, and the model of the pressure sensor (603) is an MSP330X.
8. A grouting construction method after concrete pile grouting using a combined long screw pump according to any one of claims 1 to 7, characterized in that: The specific process of grouting construction of the reinforced concrete pile (2) is as follows: The long spiral drilling machine (1) drills a hole to the designed depth. According to the geological conditions of the project, the drill rod is lifted by 25 cm and kept at the original position without stopping drilling. When pumping superfluid concrete for the first time, a hole of Φ10 cm is preferably opened at the top section of the drill rod. During the pumping process, the gas in the pump pipe (406) is discharged. The superfluid concrete is pressed out from the bottom of the drill bit (7) by using a concrete pump. The drill bit (7) is lifted while the concrete is pressed. The speed of the drill bit (7) is preferably 1.5 to 2 m / min. The concrete on the top of the pile is over-filled by 0.4 to 0.5 m until the pile is formed. Then, the pile is lowered by the self-weight sinking method or A steel cage with a grouting pipe is inserted into the concrete pile body at one time using a vibration-assisted device to form a reinforced concrete cast-in-place pile (2). After 72 hours, a certain amount of cement slurry is injected into the pile bottom through the pre-buried grouting pipe. The cement slurry has the functions of filling, compacting and consolidating the soft part of the pile bottom, which can greatly improve the bearing capacity of the pile foundation. Then, after the soil around the pile is excavated to the designed elevation, a steel casing with a diameter of 1050 mm is placed. The inner wall of the steel casing leaves a cavity of 4 to 6 cm from the pile surface, thereby effectively isolating the pile body from the soil above the foundation bottom plate.