A double-tube reversible one-way pressure grouting load box

Abstract

The present invention relates to a load box with double tubes, and in particular to a double-tube reversible unidirectional pressure grouting reinforced load box. A double-tube reversible unidirectional pressure grouting load box comprises a hydraulic device, and a liquid inlet and a liquid outlet are arranged on both sides of the cylinder body of the hydraulic device. The liquid inlet and the liquid outlet are arranged at different heights, one is located at the upper end of the cylinder body, and the other is located at the middle end of the cylinder body. The present invention has the following advantages: 1. It ensures the quality of the slurry and improves the filling rate of the load box; 2. It solves the problem of broken piles caused by the inability to discharge the liquid loaded by force after the self-balancing static load test of the foundation pile, so that the reinforced load box and the engineering pile form a whole that continuously bears the upper load by reinforcing the load box by grouting, thereby ensuring the strength and integrity of the foundation pile body.

Description

Technical Field

[0001] The invention relates to a load box with double tubes, in particular to a reinforced load box with double tubes and reversible unidirectional pressure grouting. Background Art

[0002] In the self-balancing static load test of pile foundation, the load box used generally has only one liquid injection pipe, so that after the test, the space between the cylinder and the piston of the load box is filled with a non-solidifying liquid, causing the pile to squeeze out the liquid and produce displacement when the project is under vertical compression.

[0003] Although there are load boxes that can achieve liquid discharge and grouting through two pipes, since the two pipes are at the same elevation on the upper end of the cylinder body, during grouting, only the liquid above the liquid outlet elevation can be squeezed out, and the liquid below the liquid outlet elevation cannot be completely discharged, resulting in the injected slurry being diluted, reducing the concentration of the slurry and failing to meet the reinforcement requirements. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to provide a double-tube reversible one-way pressurized grouting load box which can realize grouting while ensuring the slurry quality and improving the filling rate.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a double-tube reversible unidirectional pressure grouting load box, including a hydraulic device, and a liquid inlet and a liquid outlet are arranged on both sides of the cylinder body of the hydraulic device. The liquid inlet and the liquid outlet are arranged at different heights, one is located at the upper end of the cylinder body, and the other is located at the middle end of the cylinder body.

[0006] Preferably, the piston in the cylinder body of the hydraulic device is a plunger body with unequal cross-sections in the upper and lower parts.

[0007] Preferably, the plunger body is composed of a cylinder with the same radius and a cylinder with a groove, and the cylinder with a groove is located at the upper end of the plunger body.

[0008] Preferably, the groove cross section of the grooved cylinder is a plane, a curved surface or a conical surface.

[0009] Preferably, the plunger body is composed of two cylinders with different radii, and the cylinder with a smaller radius is located at the upper end of the plunger body.

[0010] Furthermore, it also includes a tool-type constant-pressure explosive grouting device, which includes an external grouting vertical pipe, an L-shaped reversing multifunctional device and a horizontal guide device; there are two external grouting vertical pipes, the top ends of which pass through the upper plate and the bottom ends are close to the bottom plate; the vertical part of the L-shaped reversing multifunctional device is inserted into the external grouting vertical pipe and can move up and down in the external grouting vertical pipe; the horizontal part is fixed to the bottom plate and connected to the horizontal guide device; the horizontal guide device is connected to the L-shaped reversing multifunctional device.

[0011] Preferably, the length of the vertical portion of the L-shaped reversing multifunctional device is greater than the displacement value of the plunger body at the termination condition of the self-balancing static load pile test.

[0012] Furthermore, it also includes a shaped guide flagpole rib, which includes a flag rib, a flagpole and a pole sheath. The flag rib is connected to the flagpole, and the pole sheath is installed at the tail of the flagpole; the upper shaped guide flagpole rib runs through the upper plate, the bottom plate or is attached to the edge of the upper plate and the bottom plate, the flag rib is fixed to the upper plate, and the pole sheath is installed on the part of the flagpole below the bottom plate; the lower shaped guide flagpole rib runs through the bottom plate or is attached to the edge of the bottom plate, the flag rib is fixed to the bottom plate, and the pole sheath is installed on the flagpole located between the upper plate and the bottom plate.

[0013] Preferably, the flagpole length of the upper shaped guide flagpole rib is greater than the sum of the load box height and the displacement value of the plunger body when the self-balancing static load pile test condition is terminated; the flagpole length of the lower shaped guide flagpole rib is less than the load box height and greater than the displacement value of the plunger body when the self-balancing static load pile test condition is terminated.

[0014] Preferably, the height of the rod sheath is greater than the displacement value of the plunger body at the termination condition of the self-balancing static load pile test.

[0015] Preferably, it also includes an end top, which is fixed to the tail of the flagpole and has a cross-section larger than that of the flagpole.

[0016] Preferably, a plurality of hydraulic devices are connected in series via connecting pipes.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. Ensure the slurry quality and improve the filling rate of the load box;

[0019] 2. The problem of broken piles caused by the inability to discharge the loaded liquid after the self-balancing static load test of the foundation piles was solved. The load box was reinforced by grouting, so that the reinforced load box and the engineering piles formed a whole that continuously bears the upper load, ensuring the strength and integrity of the foundation pile body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Schematic diagram of the hydraulic device structure;

[0022] Figure 3 is a schematic diagram of a structure in which multiple hydraulic devices are connected in series in an embodiment of the present invention;

[0023] Figure 4 yes Figure 1 Schematic diagram of the structure of the medium-sized tool-type constant-pressure explosive grouting device;

[0024] Figure 5 yes Figure 4 Schematic diagram of the vertical part of the middle L-shaped reversing multifunctional device and the vertical pipe structure of the grouting outside the cylinder;

[0025] Figure 6 yes Figure 1 Schematic diagram of the structure of the multifunctional shaped guide flagpole reinforcement in the middle and upper part;

[0026] Figure 7 yes Figure 1 Schematic diagram of the structure of the multifunctional shaped guide flagpole reinforcement in the middle and lower part;

[0027] Figure 8-1 This is a flow chart of liquid injection and pressurization of a hydraulic device in an embodiment of the present invention;

[0028] Figure 8-2 is a flow chart of inflation and discharge of a hydraulic device in an embodiment of the present invention;

[0029] Figure 8-3 This is a grouting flow chart of a hydraulic device in an embodiment of the present invention;

[0030] Fig. 9 It is a flow chart of grouting into a tool-type constant-pressure explosive grouting device in an embodiment of the present invention;

[0031] Fig.10 This is a schematic diagram of the working of the multifunctional shaping guide flagpole reinforcement in an embodiment of the present invention;

[0032] In the figure, 1, upper plate; 2, hydraulic device; 3, connecting pipe; 4, tool-type constant-pressure explosive grouting device; 5, bottom plate; 6, upper displacement wire; 7, upper displacement wire sheath; 8, upper multifunctional shaped guide flagpole rib; 9, lower multifunctional shaped guide flagpole rib; 20, hydraulic cylinder body; 21, high-position pipe; 22, low-position pipe; 23, upper and lower non-uniform cross-section plunger bodies; 24, sealing strip; 40, lower displacement wire; 41, vertical pipe for grouting outside the cylinder; 42, L-shaped reversing multifunctional device; 43, horizontal guiding device; 80, flag rib; 81, flagpole; 82, rod sheath; 83, end top; 90, flag rib; 91, flagpole; 92, rod sheath; 93, end top. DETAILED DESCRIPTION

[0033] It should be noted that, in this embodiment, the directional words "upper, lower" etc. are described according to the drawings and do not constitute a limitation to the present invention.

[0034] The following is combined with Figure 1-10 The present invention is further described in detail: Figure 1As shown, a double-tube reversible one-way pressure grouting load box is composed of an upper plate 1, a hydraulic device 2, a connecting pipe 3, a tool-type constant-pressure explosive grouting device 4, a bottom plate 5, an upper displacement wire 6, an upper displacement wire sheath 7, an upper multifunctional shaped guide flagpole rib 8 and a lower multifunctional shaped guide flagpole rib 9.

[0035] There are two upper displacement wire sheaths 7, which are respectively installed on two pads symmetrically distributed on the upper plate 1. The upper displacement wire 6 is set in the upper displacement wire sheath 7. It can be directly connected to the load box upper plate 1 and the bottom plate 5 to measure the load box displacement, and can also be buried in concrete to directly measure the pile displacement, which is used to measure the load box displacement or the pile displacement.

[0036] like Figure 2 As shown, the hydraulic device 2 is composed of a hydraulic cylinder body 20 , a high-position pipe 21 , a low-position pipe 22 , a plunger body 23 with upper and lower non-uniform cross-sections, and a sealing strip 24 .

[0037] The high-position pipe 21 of the hydraulic device is at the upper end of the hydraulic cylinder body 20, and its diameter is d2. The low-position pipe 22 is at the middle end of the hydraulic cylinder body 20, and its diameter is d1. The inlet and outlet are not at the same elevation, and reversible one-way is achieved during liquid injection, pressurization and grouting. That is, during liquid injection, pressurization and grouting, it can be injected from the high-position pipe and discharged from the low-position pipe; it can also be injected from the low-position pipe and discharged from the high-position pipe. At the same time, the liquid in the hydraulic cylinder body 20 can also be drained during grouting, thereby avoiding the traditional double-tube load box not draining the liquid below the liquid outlet elevation, resulting in the dilution of the injected slurry, reducing the concentration of the slurry, and failing to meet the reinforcement requirements.

[0038] In the hydraulic device, the distance between the top of the upper and lower non-uniform cross-section plunger body 23 and the hydraulic cylinder body is h, the distance between the plunger body notch and the hydraulic cylinder body is a, and the distance between the plunger body edge and the hydraulic cylinder body is b. Among them, h is slightly larger than d2, a>b; the value of b is very small, that is, there is only a slight gap between the plunger body and the cylinder body. At the same time, in order to better seal the hydraulic device, a sealing strip 24 is set between the plunger body and the hydraulic cylinder body 20.

[0039] The plunger body can be composed of a cylinder with the same radius and a cylinder with a groove. The groove section can be a plane, a curved surface, a conical surface, etc.; it can also be composed of two cylinders with different radii.

[0040] like Figure 3 As shown, multiple hydraulic devices can be connected in series through the connecting pipe 3, so as to realize the overall liquid filling and grouting of the load box.

[0041] like Figure 4-5As shown, the tool-type constant-pressure explosive grouting device 4 is composed of a lower displacement wire 40, a lower displacement wire sheath and external grouting vertical conduit 41, an L-shaped reversing multifunctional device 42, and a horizontal guide device 43. There are two vertical tubes 41 for grouting outside the cylinder, the top of which passes through the upper plate 1 and the bottom is close to the bottom plate. The vertical part of the L-shaped reversing multifunctional device 42 is inserted into the vertical tube 41 for grouting outside the cylinder, and can move up and down in the vertical tube 41 for grouting outside the cylinder. The horizontal part is welded to the bottom plate 5 and connected to the horizontal guide device 43, and the horizontal guide device is connected to the L-shaped reversing multifunctional device 42; the lower displacement wire 40 can be fixed on the lower displacement wire sheath and external grouting vertical tube 41, the outer diameter of the L-shaped reversing multifunctional device 42 is d3, and the inner diameter of the lower displacement wire sheath and external grouting vertical tube is d4, d3<d4. The pressure bearing capacity of the horizontal part of the L-shaped reversing multifunctional device 42 is PL1, and the pressure bearing capacity of the horizontal guide device 43 is PL2, PL1>PL2. The length L of the vertical portion of the L-shaped reversing multifunctional device 42 is greater than the displacement value of the upper and lower non-uniform cross-section plunger bodies when the self-balancing static load pile test is terminated.

[0042] The vertical pipe for grouting outside the cylinder and the lower displacement wire sheath are integrated into a multifunctional pipe, which can not only prevent the lower displacement wire from being gripped by concrete, but also serve as a vertical conduit for grouting outside the cylinder. The lower displacement wire sheath and the vertical conduit for grouting outside the cylinder are connected to the horizontal guide device that can withstand pressure and explode through the L-shaped reversing multifunctional device, which plays a role in diversion and diversion. At the same time, the lower displacement wire can also be fixed on the device. The horizontal guide device that can withstand pressure and explode is used to organically connect the lower displacement wire sheath and the vertical pipe for grouting outside the cylinder and the L-shaped reversing multifunctional device at both ends into a passage, guiding the slurry to enter from one end and overflow from the other end. After sampling at the overflow end, the overflow end is closed, and then the slurry is injected at high pressure from the entry end until the horizontal unidirectional flow explosive device is detonated, forcing the slurry to flow naturally and fill the gap at the load box.

[0043] The multifunctional shaped guide flagpole reinforcement comprises an upper multifunctional shaped guide flagpole reinforcement 8 and a lower multifunctional shaped guide flagpole reinforcement 9. The steel bar type and quantity of the multifunctional shaped guide flagpole reinforcement match the steel cage required by the foundation pile design.

[0044] like Figure 6As shown, the upper multifunctional shaped guiding flagpole rib 8 is composed of a flagpole 80 formed by bending steel bars, a flagpole 81, a pole sheath 82 and an end cap 83; the flagpole 80 is triangular, and the flagpole 81 is connected to one side of the flagpole 80. Preferably, the flagpole and the flagpole are integrally formed, and the end cap 83 is fixed to the tail of the flagpole 81, and its cross-section is larger than the cross-section of the flagpole 81, and the pole sheath 82 is sleeved on the flagpole 81, and the end cap 83 is covered in the pole sheath 82. The upper multifunctional shaped guide flagpole rib 8 passes through the upper plate 1 and the bottom plate 5, the flagpole rib 80 is located on the upper plate 1, and the edge of the flagpole 81 is welded to the upper plate 1, which can play a guiding role and the role of the horn rib required by the specification; the flagpole 81 passes through the upper plate and the bottom plate, and passes through the part of the sheath of the bottom plate. The flagpole length of the upper multifunctional shaped guide flagpole rib 8 is L3, and L3 is greater than the sum of the height of the load box and the displacement value of the upper and lower non-uniform cross-section plunger body when the self-balancing static load test pile test ends. The height of the sheath 82 is greater than the displacement value of the upper and lower non-uniform cross-section plunger body when the self-balancing static load test pile test ends.

[0045] like Figure 7 As shown, the lower multifunctional shaped guide flagpole rib 9 is composed of a flagpole 90, a flagpole 91, a rod sheath 92 and an end cap 93 formed by bending steel bars; the flagpole 90 is a triangle, and the flagpole 91 is connected to one side of the flagpole 90. Preferably, the flagpole and the flagpole are integrally formed, and the end cap 93 is fixed to the tail of the flagpole 91, and its cross section is larger than the cross section of the flagpole 91, and the rod sheath 92 is sleeved on the flagpole 91, and the end cap 93 is covered in the rod sheath 92; the flagpole length of the lower multifunctional shaped guide flagpole rib 9 is L4, and L4 is less than the height of the load box. The height of the rod sheath 92 is greater than the displacement value of the upper and lower non-uniform cross-section plunger bodies when the self-balancing static load pile test terminates. The lower multifunctional shaped guide flagpole rib 9 passes through the bottom plate 5, the flagpole 90 is located under the bottom plate, and the edge of the flagpole 91 fixed thereto is welded to the bottom plate 5, and the rod sheath 92 is sleeved on the flagpole located between the upper plate and the bottom plate.

[0046] During the injection and pressurization, the displacement of the hydraulic cylinder body and the upper and lower non-uniform cross-section plunger bodies due to the thrust causes a fracture layer to appear at this location; during the grouting after the test, since the upper and lower flagpoles are intertwined, the exposed flagpole bars are gripped by the grouting to form a cross-section where the steel bars and concrete work together, thereby strengthening the compression and pull-out strength of the cross-section. The steel cage is exempted from direct welding connection with the load box, and the cross-section of the joint weld of the steel cage can meet the requirements of the specification and is not at the same cross-section elevation. The rod sheath ensures that the flagpole is free to move up and down without restriction without being constrained by the concrete, and can be exposed in the fracture layer after the test.

[0047] Working steps:

[0048] 1. Liquid injection and pressurization: When liquid injection and pressurization, close the high-level pipe and inject from the low-level pipe; you can also close the low-level pipe and inject from the high-level pipe.

[0049] 1. When no liquid is injected, the plunger is in the initial position; the pressure value P1=P2=P3, such as Figure 8-1 (1) As shown;

[0050] 2. Start to inject liquid and pressurize. If it is injected from the high-level pipe, the pressure value is P1>P2>P3; if it is injected from the low-level pipe, the pressure value is P3>P2>P1. Figure 8-1 (2) as shown;

[0051] 3. Continue to inject liquid and pressurize until the test termination conditions of the self-balancing static load pile test are met. After stopping, the pressure value P1=P2=P3, such as Figure 8-1 (3) as shown;

[0052] 2. Inflation and drainage: After the injection is completed, inflation and drainage begin; during inflation and drainage, both the high-level pipe and the low-level pipe are not closed, and only the high-level pipe can be inflated and the low-level pipe can be drained.

[0053] 4. Start to inflate and discharge liquid. Open the closed high-level pipe or low-level pipe, and then inject gas from the high-level pipe. The gas fills into the cylinder from top to bottom, squeezing the liquid out from the low-level pipe. The pressure value is P1>P2>P3. Figure 8-2 (4) as shown;

[0054] 5. Continue to inflate until the lower pipe stops discharging liquid, indicating that the liquid in the cylinder has been drained. Stop inflating. After stopping, the pressure value is P1=P2=P3. Figure 8-2 (5) as shown;

[0055] 3. Grouting: When the low-level pipe stops discharging liquid, start grouting. When grouting, you can inject from the high-level pipe or from the low-level pipe.

[0056] 6. Start grouting. If grouting is done from the high-level pipe, the pressure value is P1>P2>P3; if grouting is done from the low-level pipe, the pressure value is P3>P2>P1. Figure 8-3 (6) as shown;

[0057] 7. Continue grouting until grout overflows from the other side of the pipe. After stopping, the pressure value is P1=P2=P3. Figure 8-3 (7) as shown;

[0058] 4. Grouting into the tool-type constant pressure explosive grouting device

[0059] 8. After the foundation piles are poured with concrete, the hydraulic device is injected with liquid and pressurized, and the upper and lower non-uniform cross-section plungers will extend out of the cylinder, thus forming a fracture layer in the load box; the external grouting vertical pipe will also produce the same displacement as the upper and lower non-uniform cross-section plungers. Fig. 9 (1) as shown;

[0060] 9. Grouting is carried out through the external grouting vertical pipe into the tool-type constant pressure explosive grouting device. Fig. 9 (2) as shown;

[0061] 10. Continue grouting until slurry overflows from the other side of the pipe. After sampling, seal the overflow end and then inject slurry at high pressure from the inlet end until the horizontal guide device explodes, forcing the slurry to flow naturally to and fill the gap in the load box. Fig. 9 (3) as shown;

[0062] 5. Multifunctional shaped guide flagpole reinforcement

[0063] 1. When the foundation piles are poured with concrete, the load box is filled with concrete. Fig.10 (1) as shown;

[0064] 2. After the foundation pile is poured with concrete, during the injection and pressurization, the displacement of the cylinder body and the upper and lower non-uniform cross-section plunger bodies due to the thrust causes a fracture layer to appear at this location. At this time, the upper multifunctional fixed-shaped guide flagpole rib remains stationary, and the lower multifunctional fixed-shaped guide flagpole rib moves down with the bottom plate, exposing the flagpole. Fig.10 (2) as shown;

[0065] 3. Grouting is performed into the tool-type constant-pressure explosive grouting device until the horizontal one-way flow explosive device is detonated. As the upper and lower flagpoles are interlaced, the exposed flagpole bars are gripped by the grouting to form a cross section where the steel bars and concrete work together. Fig.10 (3) as shown.

[0066] The above embodiments are only preferred embodiments of the present invention and do not constitute limitations to the present invention. The hydraulic device, the tool-type constant-pressure explosive grouting device and the multifunctional shaped guide flagpole rib can be selected according to actual conditions, one or two or all of them. In addition, the end tops in the multifunctional shaped guide flagpole rib can be selected as needed, that is, the end top structure can be omitted. It should be understood by those skilled in the art that any extension or deformation made without departing from the principle of the present invention is within the scope of protection of the present invention.

Claims

1. A double-tube reversible one-way pressure grouting load box, comprising a hydraulic device, characterized in that: A liquid inlet and a liquid outlet are arranged on both sides of the cylinder body of the hydraulic device, and the liquid inlet and the liquid outlet are arranged at different heights, one is located at the upper end of the cylinder body, and the other is located at the middle end of the cylinder body; The piston in the cylinder of the hydraulic device is a plunger body with unequal cross-sections at the top and bottom; It also includes a tool-type constant-pressure explosive grouting device, which includes a vertical tube for grouting outside the cylinder, an L-shaped reversing multifunctional device and a horizontal guide device; there are two vertical tubes for grouting outside the cylinder, the top ends of which pass through the upper plate and the bottom ends are close to the bottom plate, the vertical part of the L-shaped reversing multifunctional device is inserted into the vertical tube for grouting outside the cylinder, and can move up and down in the vertical tube for grouting outside the cylinder, the horizontal part of which is fixed to the bottom plate and connected to the horizontal guide device, and the horizontal guide device is connected to the L-shaped reversing multifunctional device; The double-tube reversible one-way pressure grouting load box includes the following working steps: (1) Inject liquid and pressurize until the test termination conditions of the self-balancing static load pile test are met, and then stop. The pressure value after stopping is P1=P2=P3; (2) Inflate and discharge liquid until the lower pipe stops discharging liquid, then stop inflating. After stopping, the pressure value is P1=P2=P3; (3) Grouting, stop until grout overflows from the other side of the pipe, and the pressure value after stopping is P1=P2=P3; Among them, P1 is the high-level pipe pressure value; P2 is the hydraulic cylinder pressure value; P3 is the low-level pipe pressure value.

2. The double-tube reversible one-way pressure grouting load box according to claim 1 is characterized in that: The plunger body is composed of a cylinder with the same radius and a cylinder with grooves, and the cylinder with grooves is located at the upper end of the plunger body.

3. The double-tube reversible one-way pressure grouting load box according to claim 2 is characterized in that: The groove section of the grooved cylinder is a plane, a curved surface or a conical surface.

4. The double-tube reversible one-way pressure grouting load box according to claim 1 is characterized in that: The plunger body is composed of two cylinders with different radii, and the cylinder with a smaller radius is located at the upper end of the plunger body.

5. The double-tube reversible one-way pressure grouting load box according to claim 1 is characterized in that: The length of the vertical part of the L-shaped reversing multifunctional device is greater than the displacement value of the plunger body at the termination condition of the self-balancing static load pile test.

6. The double-tube reversible one-way pressure grouting load box according to claim 1 is characterized in that: It also includes a shaped guide flagpole rib, which includes a flag rib, a flagpole and a pole sheath. The flag rib is connected to the flagpole, and the pole sheath is installed at the tail of the flagpole; the upper shaped guide flagpole rib runs through the upper plate, the bottom plate or is attached to the edge of the upper plate and the bottom plate, the flag rib is fixed to the upper plate, and the pole sheath is installed on the part of the flagpole under the bottom plate; the lower shaped guide flagpole rib runs through the bottom plate or is attached to the edge of the bottom plate, the flag rib is fixed to the bottom plate, and the pole sheath is installed on the flagpole located between the upper plate and the bottom plate.

7. The double-tube reversible one-way pressure grouting load box according to claim 6 is characterized in that: The flagpole length of the upper shaped guide flagpole rib is greater than the sum of the load box height and the displacement value of the plunger body when the self-balancing static load test pile test is terminated; the flagpole length of the lower shaped guide flagpole rib is less than the load box height and greater than the displacement value of the plunger body when the self-balancing static load test pile test is terminated.

8. The double-tube reversible one-way pressure grouting load box according to claim 6 is characterized in that: The height of the rod sheath is greater than the displacement value of the plunger body when the self-balancing static load pile test is terminated.

9. The double-tube reversible one-way pressure grouting load box according to claim 6 is characterized in that: It also includes an end top, which is fixed to the tail of the flagpole and has a cross section larger than that of the flagpole.

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