CN212052919U - Hollow single-cylinder jack load box - Google Patents
Hollow single-cylinder jack load box Download PDFInfo
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- CN212052919U CN212052919U CN202020684857.0U CN202020684857U CN212052919U CN 212052919 U CN212052919 U CN 212052919U CN 202020684857 U CN202020684857 U CN 202020684857U CN 212052919 U CN212052919 U CN 212052919U
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Abstract
The utility model relates to a load box that uses among foundation pile self-balancing static test, especially a load box that inside only used a jack. A hollow single-cylinder jack load box comprises an upper plate, a lower plate and a hollow single-cylinder jack, wherein the hollow single-cylinder jack comprises a liquid inlet pipe, a liquid outlet pipe, a cylinder body and a piston, a groove is formed in the cylinder body around the center of the cylinder body, and the axial direction of the groove is consistent with the axial direction of the cylinder body; the piston is in clearance fit with the groove, and the bottom of the piston and the bottom of the groove form a cavity; the upper plate and the lower plate are respectively arranged at the top and the bottom of the cylinder body and move up and down together with the piston and the cylinder body. The utility model has the advantages of as follows: 1. the node of the cylinder body is reduced, and the effectiveness of the pushing area of the load box is improved. 2. The quality of the slurry is ensured, and the filling rate is improved. 3. The engineering pile is ensured to meet the design requirement of uplift resistance. 4. The strength and the integrity of the pile body of the foundation pile are ensured. 5. The bottom of the cavity formed by the bottom of the piston and the bottom of the groove is arc-shaped, so that liquid can be drained as soon as possible.
Description
Technical Field
The utility model relates to a load box that uses among foundation pile self-balancing static test, especially a load box that inside only used a jack.
Background
In the foundation pile self-balancing static test, the load box is generally only provided with one liquid injection pipe, so that after the test, liquid which is never solidified is filled between a cylinder body and a piston of the load box body, and after the foundation pile self-balancing static test, the pile generates liquid in the load box cylinder and is extruded out to generate displacement under the vertical compression state of the engineering.
Although the existing load box can realize liquid drainage and grouting through two pipes, the two pipes are at the same elevation of the side edge of the upper end of the cylinder body, so that during grouting, the liquid above the elevation of the liquid outlet can only be extruded and discharged, and the liquid below the elevation of the liquid outlet cannot be discharged completely, so that the injected slurry is diluted by the retained liquid, the concentration of the slurry is reduced, the final setting strength of the slurry is seriously reduced, and the reinforcing requirement cannot be met. In addition, the common load box is provided with a plurality of jacks, gaps among the jacks are more, connecting nodes are more, and liquid leakage under a high-pressure state is easy to cause to influence loading.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that exists among the prior art, provide a node few, can guarantee the slurry quality simultaneously, improve the hollow single cylinder jack load box of sufficient rate.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a hollow single-cylinder jack load box comprises an upper plate, a lower plate and a hollow single-cylinder jack, wherein the hollow single-cylinder jack comprises a liquid inlet pipe, a liquid outlet pipe, a cylinder body and a piston, a groove is formed in the cylinder body around the center of the cylinder body, and the axial direction of the groove is consistent with the axial direction of the cylinder body; the piston is in clearance fit with the groove, a cavity is formed between the bottom of the piston and the bottom of the groove, a through hole I and a through hole II which are consistent with the axial direction of the cylinder body are formed in the two opposite sides of the piston, the top of the through hole I is communicated with a liquid inlet pipe which penetrates through the upper plate, the bottom of the through hole II is communicated with the cavity, a pipe groove, an elastic piece and a hollow long pipe are designed in the through hole II, one end of the elastic piece is fixed with the top of the pipe groove, the other end of the elastic piece is connected and fixed with the hollow long pipe, the bottom of the hollow long pipe extends out of the through hole II and is tightly attached to the bottom of the groove, and the; the upper plate and the lower plate are respectively arranged at the top and the bottom of the cylinder body and move up and down together with the piston and the cylinder body.
The anti-pulling lock device is used for limiting the piston in the cylinder body when the piston moves upwards and comprises an anti-pulling lock head and an anti-pulling lock groove which are matched with each other, the anti-pulling lock head is arranged at the upper part of the cylinder body, and the head end of the anti-pulling lock head faces the outer wall of the piston; the anti-pulling lock groove is arranged at the lower part of the piston, and the opening end of the anti-pulling lock groove faces the inner wall of the groove.
Preferably, the anti-pulling lock head comprises a lock head, a spring and a base which are connected in sequence, the lock head is limited in the through hole by a piston, the base is fixed with the cylinder body, and the spring is compressed between the lock head and the base.
Preferably, the anti-pulling lock devices are at least two and are oppositely arranged.
Preferably, a sealing groove is formed in the position, close to the inner wall of the groove, of the piston and used for placing the sealing ring, and the sealing groove is located below the anti-pulling locking groove.
The device comprises a piston, a pressure limiting explosive grouting device and a reversing tube, wherein the pressure limiting explosive grouting device is arranged in a groove at the top of the piston and comprises two out-of-cylinder grouting vertical tubes and two reversing tubes, the two out-of-cylinder grouting vertical tubes are used for out-of-cylinder grouting and a lower displacement wire protective sleeve, a lower displacement wire is fixed on the out-of-cylinder grouting vertical tubes, and two ends of each reversing tube are respectively inserted into the out-of-cylinder grouting vertical tubes.
Preferably, a grouting valve is installed in the reversing pipe and comprises a pressure relief channel, a solid pressure limiting sheet and a hollow screw, the solid pressure limiting sheet is arranged between the pressure relief channel and the hollow screw, and the pressure limiting value of the solid pressure limiting sheet is smaller than the pressure bearing value of the reversing pipe.
Preferably, an inner side grouting valve and an outer side grouting valve are respectively arranged on the inner wall and the outer wall of the groove; the pressure limiting value of the solid pressure limiting sheet of the outer side grouting valve is larger than that of the solid pressure limiting sheet of the inner side grouting valve.
Preferably, the bottom of the cavity is arc-shaped.
Preferably, the upper part of the hollow long pipe is provided with a sealing ring groove around the circumference thereof for placing a sealing ring.
Only use a jack, can reduce the multiple spot of cylinder body and connect, improve the validity of load case propelling movement area, detonate grout valve, inboard grout valve, outside grout valve through the slip casting to consolidate the load case and make by the continuous whole of reinforced load case and engineering pile formation, guarantee foundation pile body intensity and integrality, make it effectively transmit load case upper portion load to load case lower part pile body.
Compared with the prior art, the utility model has the advantages of as follows:
1. the number of the jacks is reduced, only one jack is used, the number of the nodes of the cylinder body is reduced, and the effectiveness of the pushing area of the load box is improved.
2. Design tube seat, elastic component and hollow long tube in the II interior designs of through-hole, have ensured the interior cavity of cylinder body before the slip casting for the slip casting body of slip casting in the cylinder body is high-purity neat thick liquid, has guaranteed the slurry quality, has improved the filling rate.
3. The uplift lock device ensures that the engineering pile meets the uplift design requirement after the foundation pile self-balancing static load test pile.
4. The pressure-limiting explosive grouting device is arranged to fill the cylinder body hollow and other gaps, so that the pile body strength and integrity of the foundation pile are ensured, and the upper load of the load box is effectively transmitted to the lower pile body of the load box.
5. The bottom of the cavity formed by the bottom of the piston and the bottom of the groove (namely the bottom of the groove) is arc-shaped, so that liquid can be drained as soon as possible.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of the hollow single-cylinder jack shown in FIG. 1;
FIG. 3 is a schematic view of the hollow long tube shown in FIG. 1;
FIG. 4 is a schematic structural view of the anti-pulling lock cylinder in FIG. 1;
FIG. 5 is a schematic view of the structure of the grouting valve of FIG. 1;
FIG. 6 is a schematic structural diagram of the pressure-limiting explosive grouting device in FIG. 1;
FIG. 7 is a schematic view of the hollow single-cylinder jack shown in FIG. 1 illustrating a start-stop state;
fig. 8 is a schematic view of the out-of-cylinder grouting of the present invention;
in fig. 1, a hollow single-cylinder jack; 2. an upper plate; 3. a lower plate; 4. a pressure-limiting explosive grouting device;
in FIG. 2, 5, a liquid inlet pipe; 6. a liquid outlet pipe; 7. a cylinder body; 8. a piston; 9. a pipe groove; 10. a spring; 11. a seal ring; 12. a hollow long tube; 13. an anti-pulling lock head; 14. An inboard grout valve; 15. an outboard grout valve; 16. a rib; 17. an anti-pulling lock groove; 18. a sealing groove and a sealing ring; 19. a groove;
in fig. 3, 20, seal ring groove; 21. An opening;
in fig. 4, 22, lock head; 23. a spring; 24. a base;
in fig. 5, 25, the pressure relief channel; 26. a solid pressure limiting sheet; 27. a hollow screw;
in fig. 6, 28, lower displacement wires; 29. the lower displacement wire sheath is also used as an external grouting vertical conduit; 30. a reversing tube; 31. a grouting valve.
Detailed Description
It should be noted that, in the following embodiments of the present invention, all the directional terms are described according to the drawings, and do not constitute a limitation of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings 1-8: a hollow single cylinder jack load box is shown in figure 1 and comprises a hollow single cylinder jack 1, an upper plate 2, a lower plate 3 and a pressure-limiting explosive grouting device 4; the hollow single-cylinder jack 1 is arranged between the upper plate 2 and the lower plate 3, and the pressure-limiting explosive grouting device 4 is arranged in the hollow single-cylinder jack 1.
As shown in fig. 2-3, the hollow single-cylinder jack 1 comprises a liquid inlet pipe 5, a liquid outlet pipe 6, a cylinder body 7 and a piston 8, wherein the cylinder body 7 is in a hollow circular ring shape, a groove is formed on the cylinder body 7 around the center of the cylinder body 7, and the axial direction of the groove is consistent with the axial direction of the cylinder body 7; the piston 8 is inserted into the groove and is in clearance fit with the groove, a cavity is formed between the bottom of the piston and the bottom of the groove, a liquid inlet hole and a liquid outlet hole which are consistent with the axial direction of the cylinder body are formed in the two opposite sides of the piston, the top of the liquid inlet hole is communicated with a liquid inlet pipe 5 penetrating through the upper plate 1, the bottom of the liquid inlet hole is communicated with the cavity, the top of the liquid outlet hole is communicated with a liquid outlet pipe 6 penetrating through the upper plate 1, the bottom of the liquid outlet hole is communicated with the cavity, a pipe groove 9, a spring 10 and a hollow long pipe 12 are designed in the liquid outlet hole, the axial direction of the pipe groove 9 is consistent with the axial direction of the liquid outlet hole, one end of the pipe groove is positioned in the liquid outlet hole, the other end of the pipe groove is flush with the bottom of; the bottom of the hollow long pipe 12 extends out of the bottom of the liquid outlet hole and is tightly attached to the bottom of the groove, the hollow long pipe is communicated with the cavity through a plurality of openings 21 formed in the bottom of the hollow long pipe, when a pressurizing air pump is used for supplying air and pressurizing from the liquid inlet pipe 5, liquid in the cylinder body 7 is pressed into the hollow long pipe from the opening of the hollow long pipe 12 by air pressure and is discharged through the hollow long pipe, and the cavity in the cylinder body 7 before grouting is ensured, so that the grouting body in the cylinder is high-purity clean slurry; the upper plate and the lower plate are respectively installed at the top and the bottom of the cylinder 7 and move up and down together with the piston 8 and the cylinder 7.
In order to ensure that the piston 8 is limited in the cylinder 7 during movement and simultaneously the load box effectively transfers the uplift force to the lower steel reinforcement cage when the upper steel reinforcement cage is subjected to the uplift force, thereby ensuring that the engineering pile meets the design requirement of the uplift after the foundation pile self-balancing static load test pile, an uplift lock device is additionally arranged between the piston and the cylinder, as shown in fig. 2 and 4, the uplift lock device comprises an uplift lock head 13 and an uplift lock groove 17 which are matched with each other, the uplift lock head 13 is arranged at the upper part of the cylinder and comprises a lock head 22, a spring 23 and a base 24 which are sequentially connected, the head end of the lock head 22 is arc-shaped and faces the outer wall of the piston 8, the spring 23 is compressed between the lock head 22 and the base 24, the base is fixed with the cylinder 7, the uplift lock groove 17 is arranged at the lower part of the piston. When the piston 8 moves upwards to the position opposite to the anti-pulling lock head 13 and the anti-pulling lock groove 17, the lock head 22 springs into the anti-pulling lock groove 17 under the action of the spring 23, so that the piston and the cylinder are locked and do not move mutually any more. In order to ensure that the anti-pulling effect is better, the anti-pulling lock devices are designed into two parts and are oppositely arranged in the two side walls of the groove; of course, the number of the anti-pulling lock structures is not limited to two, and can be multiple, and the anti-pulling lock structures are generally designed according to anti-pulling requirements (assuming that the anti-pulling capacity of each anti-pulling lock is a, and the overall anti-pulling requirement is b, the number n is more than or equal to b/a).
As shown in fig. 2, since there is a gap between the piston 8 and the groove, in order that water or slurry will not leak from the gap during the loading process, sealing grooves and sealing rings 18 are provided at opposite sides of the piston to ensure the sealing effect thereof, and the sealing grooves and the sealing rings 18 are located below the anti-pulling locking groove 17.
As shown in fig. 2, in order to ensure that water can be drained as soon as possible and the draining effect is better, the bottom surface of the groove is arc-shaped, and the bottom of the hollow long tube 12 is just attached to the lowest position of the arc. As shown in fig. 3, a sealing ring groove 20 is opened around the center of the long hollow pipe 12 near the top thereof for installing a sealing ring 11 to seal the long hollow pipe 12 and the liquid outlet pipe 6.
As shown in figure 7, water is injected into the cavity through the liquid inlet pipe 5, the piston 8 moves upwards relative to the cylinder 7 along with the increase of the water amount, the spring 10 presses the long hollow pipe 12 to enable the bottom of the long hollow pipe to be always attached to the bottom of the groove, when the anti-pulling lock groove 17 moves to be opposite to the anti-pulling lock head 13, the anti-pulling lock head 13 pops up to lock the piston 8 and the cylinder 7, and relative movement does not occur any more.
Because the cylinder body 7 is a hollow structure, and gaps among the upper plate, the lower plate and the cylinder body are more, in order to enable the reinforced load box and the engineering pile to form a continuous whole body and ensure the pile body strength and integrity of the foundation pile, the pressure-limiting explosive grouting device is added to effectively transmit the upper load of the load box to the lower pile body of the load box, as shown in fig. 5-6, the pressure-limiting explosive grouting device comprises a lower displacement wire 28, a lower displacement wire sheath and outer grouting vertical conduit 29, a reversing pipe 30 and a grouting valve 31, and the lower displacement wire 28 is fixed in the lower displacement wire sheath and outer grouting vertical conduit 29; two lower displacement wire sheath and outer grouting vertical guide pipes 29 are respectively arranged at two ends of the reversing pipe 30, and the outer grouting vertical pipe of the cylinder and the sheath pipe I of the lower displacement wire are connectedThe lower displacement wire 28 can be prevented from being held by concrete and can be used as a vertical conduit for grouting outside the cylinder; two ends of the reversing pipe 30 are respectively inserted into the lower displacement wire sheath and outer grouting vertical conduit 29, and the horizontal part of the reversing pipe is fixed with the groove 19 formed on the piston 8, so that the functions of drainage and direction change are achieved; meanwhile, the free ends of the lower displacement wire sheath and the outer grouting vertical conduit 29 and the reversing pipe 30 extend out of the upper plate 1, and the length L of the vertical part of the reversing pipe 30 is larger than the displacement value of the piston 8 under the test termination condition of the self-balancing static load test pile; the grouting valve 31 is arranged in the reversing pipe 30 and comprises a pressure relief channel 25, a solid pressure limiting sheet 26 and a hollow screw 27, wherein the solid pressure limiting sheet 26 is arranged between the pressure relief channel 25 and the hollow screw 27, and the pressure limiting value P of the solid pressure limiting sheet 26 isaLess than the bearing capacity P of the reversing tube 30bWhen the loaded pressure value is in Pa、PbIn between, the slurry breaks through the solid pressure-limiting plate 26, and is decompressed by the hollow screw 27, so that the groove 19 is filled with the slurry, namely, the first detonation point A in the figure 8. In order to fill the hollow and each gap of the cylinder 7 with slurry, as shown in fig. 2 and 8, grouting valves are respectively added on the inner wall and the outer wall of the piston groove 19, that is: the inner side grouting valve 14, the outer side grouting valve 15, the inner side grouting valve 14 and the outer side grouting valve 15 are all the same as the grouting valve 31 in structure, and the pressure limiting value of the solid pressure limiting sheet 26 of the inner side grouting valve 14 is PInner partThe solid pressure limiting sheet 26 of the outer side grouting valve 15 has a pressure limiting value POuter cover，PInner < (R) >POuter coverDue to the solid pressure limiting plate of the inner side grouting valve 14Inner partIs less than the pressure limiting value P of the solid pressure limiting sheet 26 of the outside grouting valve 15Outer coverThe inner grouting valve 14 is detonated first, forcing the slurry to naturally flow to and fill the middle hollow of the jack, i.e., the 2 nd detonation point B in fig. 8. After the middle hollow of the jack is filled, grouting is continued until the outer grouting valve 15 is detonated, and slurry is forced to naturally flow to and fill the gap at the load box, namely the 3 rd detonation point C in the figure 8.
To reinforce the recess 19, two ribs 16 are provided on the recess, the ribs 16 being arranged uniformly around the circumference of the recess.
The implementation steps are as follows:
liquid injection and pressurization: when injecting liquid and pressurizing, the liquid outlet pipe 6 is sealed and injected from the liquid inlet pipe 5;
1. when unpressurized, the piston is in the initial position, the spring is compressed, and the pressure value P1= P2= P3= P4, as shown in fig. 7 (a);
2. pressurizing, sealing the liquid outlet pipe 6, and pressurizing from the liquid feeding pipe 5; the spring always supports the hollow long pipe to enable the hollow long pipe to be tightly attached to the bottom plate, and the pressure value P1 is more than P2 is more than P3 is more than P4;
3. the liquid injection and pressurization are continued, when the anti-pulling lock groove 17 on the piston 8 reaches the position of the anti-pulling lock head 13, the anti-pulling lock head 13 is ejected, the dead-lock piston can not move any more, and when the end condition is reached, the pressure value P1= P2= P3= P4, as shown in FIG. 7 (b);
(II) inflation and drainage: after the liquid injection is finished, the inflation and liquid drainage are started, and the liquid inlet pipe 5 and the liquid outlet pipe 6 are not closed when the inflation and liquid drainage are carried out;
4. and (3) starting inflation and drainage: gas is injected from the liquid inlet pipe 5, the gas is filled into the cylinder body 7 from top to bottom, the extrusion liquid is discharged from the liquid outlet pipe 6, and the pressure value P1 is more than P2 is more than P3 is more than P4;
5. continuously inflating until the liquid outlet pipe 6 does not discharge liquid any more, indicating that the liquid in the cylinder body is drained, stopping inflating, and stopping inflating until the pressure value is P1= P2= P3= P4;
(III) grouting: when the liquid outlet pipe 6 does not discharge liquid any more, grouting is started;
6. and (3) starting grouting: injecting from the liquid inlet pipe 5, wherein the pressure value is P1 > P2 > P3 > P4;
7. grouting is continued until the slurry overflows from the liquid outlet pipe, and the grouting is stopped until the pressure value is P1= P2= P3= P4;
(IV) grouting in pressure-limiting explosive grouting device
8. After closing the lower displacement wire sheath at one end and the outer grouting vertical conduit, continuously grouting until slurry overflows from the conduit at the other side, and sampling;
9. after sampling, the overflow end is closed, and then slurry is injected from the inlet end at high pressure until the grouting valve 31 is detonated, so that the slurry naturally flows to and fills the groove 19 of the piston;
10. the solid pressure limiting sheet of the inner side grouting valve has a pressure limiting value of PInner partSmaller than the solid pressure-limiting sheet 26 of the outer grouting valveThe limiting value is POuter coverTherefore, the inner side grouting valve is detonated first, and the slurry is forced to naturally flow to and fill the middle hollow of the jack;
11. after the middle hollow of the jack is filled, the grouting is continued until the outer side grouting valve is detonated, and slurry is forced to naturally flow to and fill the gap at the load box.
In this example, water was used as the loading liquid, and the affinity to the slurry was better and the cost was lower than oil.
The above embodiment is only a preferred embodiment of the present invention, and does not limit the present invention. The anti-pulling lock device can be arranged in any load box structure utilizing the principle of the jack, the pressure-limiting and explosive grouting device and the anti-pulling lock device can be arranged in the same implementation mode at the same time, and can also be arranged in different implementation modes separately, namely, the pressure-limiting and explosive grouting device is suitable for any load box structure. Any extension, deformation and the like of the ordinary skilled in the art without departing from the working principle of the present invention shall be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a hollow single cylinder jack load case, includes upper plate, hypoplastron and hollow single cylinder jack, its characterized in that: the hollow single-cylinder jack comprises a liquid inlet pipe, a liquid outlet pipe, a cylinder body and a piston, wherein a groove is formed in the cylinder body around the center of the cylinder body, and the axial direction of the groove is consistent with the axial direction of the cylinder body; the piston is in clearance fit with the groove, the bottom of the piston and the bottom of the groove form a cavity, a through hole I and a through hole II are formed in two opposite sides of the piston, the top of the through hole I is communicated with a liquid inlet pipe penetrating through the upper plate, the bottom of the through hole II is communicated with the cavity, the top of the through hole II is communicated with a liquid outlet pipe penetrating through the upper plate, the bottom of the through hole II is communicated with the cavity, a pipe groove, an elastic part and a hollow long pipe are designed in the through hole II, one end of the elastic part is fixed with the top of the pipe groove, the other end of the elastic part is fixedly connected with the hollow long pipe, the bottom of the hollow; the upper plate and the lower plate are respectively arranged at the top and the bottom of the cylinder body and move up and down together with the piston and the cylinder body.
2. The hollow single cylinder jack load box of claim 1, wherein: the anti-pulling lock device is used for limiting the piston in the cylinder body when the piston moves upwards and comprises an anti-pulling lock head and an anti-pulling lock groove which are matched with each other, the anti-pulling lock head is arranged at the upper part of the cylinder body, and the head end of the anti-pulling lock head faces the outer wall of the piston; the anti-pulling lock groove is arranged at the lower part of the piston, and the opening end of the anti-pulling lock groove faces the inner wall of the groove.
3. The hollow single cylinder jack load box of claim 2, wherein: the anti-pulling lock head comprises a lock head, a spring and a base which are connected in sequence, the lock head is limited in the through hole by a piston, the base is fixed with the cylinder body, and the spring is compressed between the lock head and the base.
4. The hollow single cylinder jack load box of claim 2 or 3, wherein: the anti-pulling lock devices are at least two and are arranged oppositely.
5. The hollow single cylinder jack load box of claim 4, wherein: and a sealing groove is formed in the position, close to the inner wall of the groove, of the piston and used for placing a sealing ring, and the sealing groove is located below the anti-pulling locking groove.
6. The hollow single cylinder jack load box of claim 1, wherein: the device comprises a piston and is characterized by further comprising a pressure-limiting explosive grouting device, wherein the pressure-limiting explosive grouting device is arranged in a groove in the top of the piston and comprises an out-of-cylinder grouting vertical pipe and reversing pipes, the number of the out-of-cylinder grouting vertical pipes is two, the out-of-cylinder grouting vertical pipes are used for out-of-cylinder grouting and lower displacement wire protecting sleeves, the lower displacement wires are fixed on the out-of-cylinder grouting vertical pipes, and two ends of each reversing pipe are respectively inserted into the out-of-.
7. The hollow single cylinder jack load box of claim 6, wherein: the grouting valve is arranged in the reversing pipe and comprises a pressure relief channel, a solid pressure limiting sheet and a hollow screw, the solid pressure limiting sheet is arranged between the pressure relief channel and the hollow screw, and the pressure limiting value of the solid pressure limiting sheet is smaller than the pressure bearing value of the reversing pipe.
8. The hollow single cylinder jack load box of claim 7, wherein: an inner side grouting valve and an outer side grouting valve are respectively arranged on the inner wall and the outer wall of the groove; the pressure limiting value of the solid pressure limiting sheet of the outer side grouting valve is larger than that of the solid pressure limiting sheet of the inner side grouting valve.
9. The hollow single cylinder jack load box of claim 1, wherein: the bottom of the cavity is arc-shaped.
10. The hollow single cylinder jack load box of claim 1, wherein: the upper part of the hollow long pipe is provided with a sealing ring groove around the circumference thereof for placing a sealing ring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020684857.0U CN212052919U (en) | 2020-04-29 | 2020-04-29 | Hollow single-cylinder jack load box |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020684857.0U CN212052919U (en) | 2020-04-29 | 2020-04-29 | Hollow single-cylinder jack load box |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117242971A (en) * | 2023-11-17 | 2023-12-19 | 安徽农业大学 | Water-saving irrigation fertilization equipment based on quantitative control |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117242971A (en) * | 2023-11-17 | 2023-12-19 | 安徽农业大学 | Water-saving irrigation fertilization equipment based on quantitative control |
| CN117242971B (en) * | 2023-11-17 | 2024-02-13 | 安徽农业大学 | Water-saving irrigation fertilization equipment based on quantitative control |
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Effective date of registration: 20211129 Address after: 330000 plant 2, No. 918, Huohuo Liu Road, Nanchang high tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee after: Jiangxi Hongli Precision Manufacturing Co.,Ltd. Patentee after: Jiangxi Lianbao Engineering Consulting Co., Ltd Address before: 330000 Baishuihu Lake Management Office, Nanchang Economic and Technological Development Zone, Nanchang City, Jiangxi Province Patentee before: JIANGXI LIANBAO ENGINEERING CONSULTING Co.,Ltd. |
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