Pile foundation grouting reinforcement device

Abstract

The utility model aims to provide a pile foundation reinforcing device. The pile foundation reinforcing device comprises a grouting pipe, a sleeve valve pipe, a plunger I, a plunger II, a grouting plug and a hydraulic system. The side wall of the solid section is not provided with an opening, the upper end and the lower end of the solid section are open, the upper end of the floral tube section is open, the lower end of the floral tube section is sealed, and a plurality of grout outlets blocked by grouting plugs are formed in the side wall of the floral tube section. The grouting pipe is inserted into the sleeve valve pipe, and the insertion end is connected with a plunger I; a hydraulic system is arranged below the plunger I and comprises a plurality of pressure pipelines, a main body rod and a piston rod, one end of the piston rod penetrates through the plunger I to be connected with the pressure pipelines, a plunger II is fixed to the other end of the piston rod, and a rod body of the piston rod is further sleeved with the main body rod with one end connected with the lower surface of the plunger I. According to the device, multi-section grouting from bottom to top can be achieved, the grouting pressure and the grouting slurry concentration of different sections can be adjusted according to the grouting pressure and the grouting slurry concentration, accurate grouting in the two aspects of the spatial position and the grouting pressure is achieved, and the engineering requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of pile foundation grouting reinforcement, in particular to a pile foundation grouting reinforcement device. Background Technique

[0002] The quality of the pile foundation directly affects the bearing performance and safety of the structure. When the strength of the site soil is not high and the end of the pile foundation cannot be embedded in the rock bearing layer due to various factors and is embedded in a relatively soft soil layer, the safety of the pile foundation cannot be guaranteed. Grouting reinforcement is a commonly used method for pile foundation reinforcement. Its main purpose is to improve the conditions of the pile foundation bearing layer through grouting, increase the side friction resistance of the pile, increase the bearing area at the pile end, thereby improving the bearing capacity and stability of the pile, and avoiding the damage and instability of the pile foundation.

[0003] At present, there are many types of reinforcement slurries and reinforcement methods for pile foundation grouting reinforcement, but the functions of the grouting reinforcement device are still lacking. The current pile foundation grouting reinforcement devices mostly inject grout through side holes and the grouting pressure of each grouting hole is the same. However, due to the action of gravity and osmosis, the grout ejected from the upper grouting holes will gradually seep into the lower strata, resulting in less grout content in the upper strata than in the lower strata, and uniform grouting cannot be achieved. Content of the Utility Model

[0004] The purpose of the utility model is to provide a pile foundation grouting reinforcement device, which includes a grouting pipe, a sleeve valve pipe, a plunger I, a plunger II, a grouting plug and a hydraulic system.

[0005] The sleeve valve pipe includes a solid section L1 and a perforated pipe section L2.

[0006] The solid section L1 is a tubular structure with no openings on the side wall, open upper and lower ends and a hollow interior.

[0007] The perforated pipe section L2 is a tubular structure with an open upper end, a sealed lower end and a hollow interior.

[0008] A number of slurry outlets are provided on the side wall of the perforated pipe section L2.

[0009] The slurry outlets are blocked by grouting plugs.

[0010] The grouting pipe is inserted into the sleeve valve pipe.

[0011] One end of the grouting pipe inserted into the sleeve valve pipe is connected to the plunger I.

[0012] A hydraulic system is provided below the plunger I.

[0013] The hydraulic system includes a number of pressure pipes, a main rod and a piston rod.

[0014] A main rod with one end connected to the lower surface of the plunger I is sleeved on the rod body of the piston rod.

[0015] One end of the piston rod passes through the plunger I and is connected to the pressure pipeline, and the other end is fixed with a plunger II.

[0016] The plunger II is located below the plunger I.

[0017] Furthermore, the grouting pipe is a steel pipe with both ends open.

[0018] Furthermore, a number of slurry outlets are evenly arranged at intervals in the circumferential and longitudinal directions of the perforated pipe section L2.

[0019] Furthermore, in the longitudinal direction of the perforated pipe section L2, the center distance between adjacent slurry outlets is 30 cm.

[0020] Furthermore, a retaining piece and connecting steel bars arranged at intervals around the retaining piece are provided at the slurry outlet. One end of the connecting steel bar is connected to the retaining piece, and the other end is connected to the outermost side of the slurry outlet.

[0021] Furthermore, the plunger I includes a plunger steel sheet I and a sealing rubber ring wrapping the plunger steel sheet I.

[0022] A central hole and a number of through holes are provided on the plunger steel sheet I.

[0023] The plunger II includes a plunger steel sheet II and a sealing rubber ring wrapping the plunger steel sheet II.

[0024] The plunger steel sheet II is a solid steel sheet.

[0025] The grouting pipe is inserted into the central hole.

[0026] Bases are provided at the corresponding positions on the upper and lower surfaces of the through holes and the upper surface of the plunger II.

[0027] The pressure pipeline, the main rod, and the piston rod are respectively connected to different bases.

[0028] Furthermore, the sealing rubber ring is made of rubber material.

[0029] Furthermore, in the grouting state, the grouting pipe can move within the sleeve valve pipe.

[0030] Furthermore, in the grouting state, the piston rod is controlled to move up and down through the pressure pipeline.

[0031] Furthermore, the pressure ranges that the plunger I and the plunger II can withstand are 0 ≤ P < 5 Mpa.

[0032] The technical effects of the present utility model are beyond doubt, and the beneficial effects of the present utility model are as follows:

[0033] Compared with the existing device, this device can realize the multiple grouting reinforcement process of the slurry, and the movable grouting pipe is relatively free when grouting and reinforcing along the depth direction of the pile foundation, so that it can adapt to the changes of the pile foundation soil layer parameters along the depth direction during the grouting process, such as density, porosity and permeability, etc.;

[0034] Through the vertical movement of the grouting pipe and the telescopic movement of the piston rod, this device can realize the individual grouting of any grouting hole and the combined grouting of adjacent grouting holes. For example, Figure 2 It can realize six-stage grouting, that is, the third grouting hole in the bottom layer is grouted individually, the second grouting hole in the middle is grouted individually, the first grouting hole in the upper part is grouted individually, the second and third grouting holes are grouted in combination, the first and second grouting holes are grouted in combination, and all grouting holes are grouted simultaneously. When the number of grouting holes in the perforated pipe section increases, more-stage grouting processes can be realized.

[0035] Through the hydraulic system, this device can perform the telescopic movement of the piston rod, thereby driving the lower plunger to move up and down, realizing the pressurization and decompression of the slurry in the perforated pipe section L2, so that each grouting hole has the function of grouting under different grouting pressures. Different grouting pressures and slurry concentrations can be adjusted accordingly to realize precise grouting in terms of both spatial position and grouting pressure to meet the engineering requirements. Brief Description of the Drawings

[0036] Figure 1 It is a schematic diagram of the grouting device of the present utility model.

[0037] Figure 2 It is a schematic diagram of the pile foundation grouting process of the present utility model.

[0038] Figure 3 It is a large-scale drawing of the grouting hole.

[0039] Figure 4 It is a large-scale drawing of plunger I.

[0040] Figure 5 It is a large-scale drawing of plunger II.

[0041] In the figure: 1 - grouting pipe, 2 - sleeve valve pipe, 21 - slurry outlet, 211 - baffle, 212 - connecting steel bar, 31 - plunger I, 311 - plunger steel sheet I, 312 - sealing rubber ring, 313 - central hole, 314 - through hole, 32 - plunger II, 321 - plunger steel sheet II, 4 - grouting plug, 5 - hydraulic system, 51 - pressure pipeline, 52 - main body rod, 53 - piston rod, 54 - base. Detailed Embodiment

[0042] The present utility model will be further described below in conjunction with embodiments, but it should not be understood that the above-mentioned subject matter scope of the present utility model is limited to the following embodiments. Without departing from the above-mentioned technical idea of the present utility model, various substitutions and changes made according to the common general knowledge and customary means in the art should be included within the protection scope of the present utility model.

[0043] Embodiment 1:

[0044] Refer to Figure 1 and Figure 2 , a pile foundation reinforcement device, comprising a grouting pipe 1, a sleeve valve pipe 2, a plunger I 31, a plunger II 32, a grouting plug 4 and a hydraulic system 5.

[0045] The sleeve valve pipe 2 includes a solid section L1 and a perforated pipe section L2.

[0046] The solid section L1 is a tubular structure with no openings on the side wall, open at both the upper and lower ends and hollow inside.

[0047] The perforated pipe section L2 is a tubular structure with an open upper end, a sealed lower end and hollow inside.

[0048] A number of slurry outlets 21 are provided on the side wall of the perforated pipe section L2.

[0049] The slurry outlets 21 are blocked by the grouting plug 4.

[0050] The grouting pipe 1 is inserted into the sleeve valve pipe 2.

[0051] One end of the grouting pipe 1 inserted into the sleeve valve pipe 2 is connected to the plunger I 31, and the plunger I 31 is close to the end of the grouting pipe 1.

[0052] A hydraulic system 5 is provided below the plunger I 31.

[0053] The hydraulic system 5 includes a number of pressure pipes 51, a main body rod 52 and a piston rod 53.

[0054] A main body rod 52 with one end connected to the lower surface of the plunger I 31 is sleeved on the rod body of the piston rod 53.

[0055] One end of the piston rod 53 passes through the plunger I 31 and is connected to the pressure pipe 51 located above the plunger I 31, and a plunger II 32 is fixed at the other end.

[0056] The plunger II 32 is located below the plunger I 31.

[0057] The hydraulic system 5 is equipped with a pressure sensor to monitor the grouting pressure in the grouting device in real time.

[0058] The pile foundation grouting reinforcement device is inserted into the drill holes, and these drill holes are arranged around the pile in a circular pattern.

[0059] Grout is injected from the top of the grouting pipe 1. When the grouting pressure exceeds 0.8 Mpa, the grouting plug 4 is automatically broken through, and the grout flows out from the slurry outlet 21.

[0060] During grouting, the upper plunger I 31 and the lower plunger II 32, as well as the grouting pipe 1, are all filled with grout. When pressure is applied through the piston rod 53, the upper part of the grouting pipe 1 needs to be sealed in time to prevent the backflow of grout.

[0061] Example 2:

[0062] The main structure of this example is the same as that of Example 1. Further, the grouting pipe 1 is a steel pipe with both ends open.

[0063] Example 3:

[0064] The main structure of this example is the same as any one of Examples 1 to 2. Further, a plurality of slurry outlets 21 are evenly arranged at intervals in the circumferential and longitudinal directions of the perforated pipe section L2.

[0065] Example 4:

[0066] The main structure of this example is the same as any one of Examples 1 to 3. Further, in the longitudinal direction of the perforated pipe section L2, the center distance between adjacent slurry outlets 21 is 30 cm, and it can also be adjusted according to the actual engineering needs.

[0067] Example 5:

[0068] The main structure of this example is the same as any one of Examples 1 to 4. Further, referring to Figure 3 , a baffle 211 and connecting steel bars 212 arranged at intervals around the baffle 211 are provided at the slurry outlet 21.

[0069] One end of the connecting steel bar 212 is connected to the baffle 211, and the other end is connected to the outermost side of the slurry outlet 21 to form an annular slurry outlet.

[0070] Example 6:

[0071] The main structure of this example is the same as that of Example 5. Further, the inner diameter of the annular slurry outlet is 5 cm, and the outer diameter is 10 cm.

[0072] Example 7:

[0073] The main structure of this example is the same as any one of Examples 1 to 6. Further, referring to Figure 4 , the plunger I 31 includes a plunger steel sheet I 311 and a sealing rubber ring 312 that wraps the plunger steel sheet I 311.

[0074] A central hole 313 and a plurality of through holes 314 are provided on the plunger steel sheet I 311.

[0075] See Figure 5 , the plunger II 32 includes a plunger steel sheet II 321 and a sealing rubber ring 312 that wraps the plunger steel sheet II 321.

[0076] The plunger steel sheet II 321 is a solid steel sheet.

[0077] The grouting pipe 1 is inserted into the central hole 313.

[0078] Base seats 54 are provided at corresponding positions on the upper and lower surfaces of the through hole 314 and the upper surface of the plunger II 32.

[0079] The pressure pipeline 51, the main body rod 52, and the piston rod 53 are respectively connected to different base seats 54.

[0080] See Figure 1 , the pressure pipeline 51 is connected to the base seat 54 provided on the upper surface of the through hole 314; the main body rod 52 is connected to the base seat 54 provided on the lower surface of the through hole 314; one end of the piston rod 53 enters the inside of the main body rod 52, and the other end is connected to the base seat 54 provided on the upper surface of the plunger II 32.

[0081] Example 8:

[0082] The main structure of this example is the same as that of Example 7. Further, the sealing rubber ring 312 is made of rubber material, and the plunger 3 is used to achieve the sealing effect and the slurry pressurization effect.

[0083] Example 9:

[0084] The main structure of this example is the same as any one of Examples 1 to 8. Further, in the grouting state, the grouting pipe 1 can move within the sleeve valve pipe 2 to achieve multi-stage grouting.

[0085] See Figure 2 , this device can achieve six-stage grouting, that is, the third grouting hole in the lowest layer is grouted alone, the second grouting hole in the middle is grouted alone, the first grouting hole in the upper part is grouted alone, the second and third grouting holes are grouted in combination, the first and second grouting holes are grouted in combination, and all grouting holes are grouted simultaneously. When the number of grouting holes in the perforated pipe section increases, more stages of grouting process can be achieved.

[0086] Example 10:

[0087] The main structure of this example is the same as any one of Examples 1 to 9. Further, in the grouting state, the hydraulic system 5 can control the up and down movement of the piston rod 53 through the pressure pipeline 51, thereby controlling the up and down movement of the plunger II 32.

[0088] The pressure is controlled through the pressure pipe 51, so that the piston rod 53 is extended and retracted, driving the base 54 and the lower plunger II32 to move up and down, thereby realizing free grouting of the grouting port 21 and controlling the grouting pressure.

[0089] Embodiment 11:

[0090] The main structure of this embodiment is the same as any one of Embodiments 1 to 10. Furthermore, the plunger I31 and the plunger II32 can withstand a pressure range of 0≤P<5Mpa.

[0091] Embodiment 12:

[0092] The main structure of this embodiment is the same as any one of Embodiments 1 to 11. Furthermore, the device can realize multi-stage grouting from bottom to top, and the grouting pressure and grouting slurry concentration of different sections can be adjusted accordingly to achieve precise grouting in both spatial position and grouting pressure to meet engineering needs.

[0093] The device can perform grouting multiple times, and the movable grouting pipe is relatively free when grouting and reinforcing along the depth direction of the pile foundation. The retractable piston rod is more convenient when adjusting the grouting pressure, so that the grouting process can adapt to the changes in the pile foundation soil layer parameters along the depth direction, such as density, porosity and permeability.

[0094] Embodiment 13:

[0095] The main structure of this embodiment is the same as any one of Embodiments 1 to 12. Furthermore, the grouting reinforcement process of the pile foundation reinforcement device is as follows:

[0096] Drilling: Calculate the rock penetration depth of each borehole based on the engineering geological survey report.

[0097] Drill holes in the order of outer piles first and then center piles to prevent slurry from flowing out of the site.

[0098] The drilling machines are arranged along the edge of the pile foundation, and a drilling machine is set up every n piles.

[0099] Each pile has N holes drilled in total. The drilling machine drills only one hole at a time and moves to the next pile after drilling each hole. Every n piles constitutes a cycle.

[0100] Making the slurry stop wall: insert a steel pipe into the drilled hole and inject casing material from the bottom.

[0101] After the casing material is cured, the steel pipe is pulled out, the sleeve valve pipe 2 is inserted, and then the grouting pipe 1 equipped with a plunger 3 is inserted, and slurry made of cement, water and water glass is injected into the grouting pipe 1 to form a slurry stop wall.

[0102] Carry out grouting construction: pour grouting liquid into the grouting pipe to make the grouting liquid fully contact with the soil.

[0103] After closing the grouting valve, pull out the grouting pipe after 0.4h - 0.6h.

[0104] Filling and plugging: After the grouting construction is completed, pull out the sleeve valve pipe, and fill and plug the grouting hole from bottom to top with mortar.

[0105] When the grout comes out of the grouting pipe for 5 seconds, close the valve and gradually increase the grouting pressure.

[0106] When the pressure reaches the designed value and the pressure remains stable, observe the grout injection volume. If the injection volume decreases, continue to pressurize.

[0107] After reaching the termination pressure, continue grouting for no less than 10 minutes before stopping grouting to prevent the pressure at the end of the grouting pipe from being greater than the grouting pressure and causing grout backflow.

[0108] When ground grout ejection or sudden change of grouting pressure occurs, immediately interrupt grouting.

[0109] Example 14:

[0110] The main structure of this example is the same as that of Example 13. Further, the drilling machine is arranged along the pile foundation edge line, and a drilling machine is set every 4 piles.

[0111] Each pile is drilled with a total of 5 holes. The drilling machine drills only 1 hole at a time. After drilling each hole, it moves to the next pile. Every 4 piles form a cycle.

[0112] Example 15:

[0113] The main structure of this example is the same as that of Example 13. Further, the drilling machine is arranged along the pile foundation edge line, and a drilling machine is set every 4 piles.

[0114] Each pile is drilled with a total of 6 holes. The drilling machine drills only 1 hole at a time. After drilling each hole, it moves to the next pile. Every 4 piles form a cycle.

[0115] Example 16:

[0116] The main structure of this example is the same as any one of Examples 13 - 15. Further, when the grouting pressure gradually increases to the designed final pressure, continue grouting for more than 10 minutes before stopping grouting.

[0117] Example 17:

[0118] The main structure of this example is the same as any one of Examples 1 - 16. Further, the grout is injected into the pile foundation position in batches through the grouting material equipment and the grout conveying equipment, so that the grout forms a grout - soil combination with the soil layer around the pile foundation under the action of infiltration diffusion, splitting diffusion, crack filling and extrusion filling, effectively controlling the reaction time and reaction amount.

[0119] Example 18:

[0120] The main structure of this example is the same as any one of Examples 1 to 17. Further, the single grouting volume is determined according to the total grouting volume and the number of grouting batches. The volume is measured before the slurry is injected into the grouting pool, and the grouting pool is connected to the grouting pump. The grouting volume can be determined according to the grouting pressure and the grouting flow rate of the grouting pump, and is compared and verified with the remaining slurry in the grouting pool.

Claims

1. A pile foundation grouting reinforcement device, characterized in that: It includes a grouting pipe (1), a sleeve valve pipe (2), a plunger I (31), a plunger II (32), a grouting plug (4) and a hydraulic system (5); The sleeve valve pipe (2) includes a solid section L1 and a perforated pipe section L2; The solid section L1 is a tubular structure with a hollow interior, open upper and lower ends, and no openings on the side walls; The perforated pipe section L2 is a tubular structure with an open upper end, a sealed lower end, and a hollow interior; A number of slurry outlets (21) are provided on the side wall of the perforated pipe section L2; The slurry outlets (21) are blocked by a grouting plug (4); The grouting pipe (1) is inserted into the sleeve valve pipe (2); One end of the grouting pipe (1) inserted into the sleeve valve pipe (2) is connected to the plunger I (31); A hydraulic system (5) is provided below the plunger I (31); The hydraulic system (5) includes a number of pressure pipes (51), a main body rod (52) and a piston rod (53); A main body rod (52) whose one end is connected to the lower surface of the plunger I (31) is sleeved on the piston rod (53); One end of the piston rod (53) passes through the plunger I (31) and is connected to the pressure pipe (51), and a plunger II (32) is fixed at the other end; The plunger II (32) is located below the plunger I (31).

2. The pile foundation grouting reinforcement device according to claim 1, characterized in that: The grouting pipe (1) is a steel pipe with open ends at both ends.

3. A pile foundation grouting reinforcement device according to claim 1, characterized in that: A number of slurry outlets (21) are evenly arranged at intervals in the circumferential and longitudinal directions of the perforated pipe section L2.

4. A pile foundation grouting reinforcement device according to claim 1, characterized in that: In the longitudinal direction of the perforated pipe section L2, the center distance between adjacent slurry outlets (21) is 30 cm.

5. The grouting reinforcement device for pile foundation according to claim 1, wherein: A retaining piece (211) and connecting steel bars (212) arranged at intervals around the retaining piece (211) are provided at the slurry outlet (21); one end of the connecting steel bar (212) is connected to the retaining piece (211), and the other end is connected to the outermost side of the slurry outlet (21).

6. The pile foundation grouting reinforcement device according to claim 1, characterized in that: The plunger I (31) includes a plunger steel sheet I (311) and a sealing rubber ring (312) wrapping the plunger steel sheet I (311); A central hole (313) and a number of through holes (314) are provided on the plunger steel sheet I (311); The plunger II (32) includes a plunger steel sheet II (321) and a sealing rubber ring (312) wrapping the plunger steel sheet II (321); The plunger steel sheet II (321) is a solid steel sheet; The grouting pipe (1) is inserted into the central hole (313); Base seats (54) are provided at the corresponding positions on the upper and lower surfaces of the through holes (314) and the upper surface of the plunger II (32); The pressure pipe (51), the main body rod (52), and the piston rod (53) are respectively connected to different base seats (54).

7. A pile foundation grouting reinforcement device according to claim 6, characterized in that: The sealing rubber ring (312) is made of rubber material.

8. A pile foundation grouting reinforcement device according to claim 1, characterized in that: In the grouting state, the grouting pipe (1) can move within the sleeve valve pipe (2).

9. A pile foundation grouting reinforcement device according to claim 1, characterized in that: In the grouting state, the piston rod (53) is controlled to move up and down through the pressure pipe (51).

10. A pile foundation grouting reinforcement device according to claim 1, characterized in that: The pressure range that the plunger I (31) and the plunger II (32) can withstand is 0 ≤ P < 5 Mpa.

Images