CN203782713U - Micro pile grouting pile-forming device - Google Patents
Micro pile grouting pile-forming device Download PDFInfo
- Publication number
- CN203782713U CN203782713U CN201420054220.8U CN201420054220U CN203782713U CN 203782713 U CN203782713 U CN 203782713U CN 201420054220 U CN201420054220 U CN 201420054220U CN 203782713 U CN203782713 U CN 203782713U
- Authority
- CN
- China
- Prior art keywords
- pile
- slip casting
- bag
- grouting
- outer tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 238000007569 slipcasting Methods 0.000 claims description 71
- 229920002635 polyurethane Polymers 0.000 claims description 31
- 239000004814 polyurethane Substances 0.000 claims description 31
- 238000005187 foaming Methods 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 18
- 229920005830 Polyurethane Foam Polymers 0.000 abstract description 15
- 239000011496 polyurethane foam Substances 0.000 abstract description 15
- 239000011440 grout Substances 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 19
- 239000004568 cement Substances 0.000 description 17
- 238000002347 injection Methods 0.000 description 13
- 239000007924 injection Substances 0.000 description 13
- 239000002689 soil Substances 0.000 description 11
- 239000002002 slurry Substances 0.000 description 9
- 150000005846 sugar alcohols Polymers 0.000 description 7
- 239000004970 Chain extender Substances 0.000 description 5
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 239000004604 Blowing Agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 150000001913 cyanates Chemical class 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 150000001412 amines Chemical group 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- -1 hydrogen atom compound Chemical class 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003863 metallic catalyst Substances 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 210000004911 serous fluid Anatomy 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The utility model discloses a micro pile grouting pile-forming device, which is characterized by comprising two-component polyurethane foam equipment, a grouting pipe, an outer grouting pipe and a flexible pile bag, wherein the grouting pipe extends outwards into the bottom of the outer grouting pipe from an outlet of the two-component polyurethane foam equipment, and one end of the outer grouting pipe is connected with the outlet of the two-component polyurethane foam equipment; the other end of the outer grouting pipe extends into the flexible pile bag, and a bag opening of the flexible pile bag is in sealing connection with the outer wall of the outer grouting pipe. The micro pile grouting pile-forming device provided by the utility model has the advantages of simple structure, simple and quick construction, controllable pile diameter and pile type, high single-pile bearing capacity, good foundation embedding capability, small grout amount, short construction period, and no reducing and breaking quality accidents, and is suitable for large-scale popularization and application.
Description
Technical field
The utility model relates to grouting equipment, is specifically related to a kind of mini pile grouting pile-forming device.
Background technology
For the construction of structures of building at soft foundation, if do not consider or take effective measures of foundation treatment in design or construction stage, build up the large-area surface settlement of rear easy appearance, if foundation soil is weak uneven, there will be excessive relative settlement, in construction of structures, produce crack, Damage Structure safety.
Mini pile is the Novel pile type of the feature such as a kind ofly have that bearing capacity is higher, quick construction, arrangement form are flexible, is widely used in the stabilization workss such as construction of structures transformation reinforcing and correction, flood control dam and column foot and side slope.
In recent years, floral tube cement injection "forming column has obtained using widely in the sedimentation floor treatment of the construction of structures of soft clay area.Floral tube cement injection "forming column is to utilize floral tube to inject the cement grout with certain gelling time in reclamation district.Owing to being preset with aperture on steel floral tube; by aperture soil body grouting methol towards periphery; the slurries that inject are discharged moisture and the air in crack between soil particle under pressure with filling, infiltration and the mode such as compacted; and occupy the space between soil particle; soil body void ratio is reduced; intensity improves; through cement setting after a period of time; original loose soil particle or crack is cemented to an entirety by slurries; form a miniature pile body that intensity is large, water resistance is high and chemical stability is good; improve foundation soil body intensity, reduce the settling amount in later stage.
But also there are following shortcomings in floral tube cement injection "forming column:
(1) floral tube cement injection "forming column adopts cement as grouting agent, and cement particle diameter is larger, and coarse granule is many, and maximum particle diameter can reach 90～100 μ m. water/binder ratio when larger, the poor stability of slurries, and easily bleed returns densely, can not effectively pour into slight crack;
(2) floral tube cement injection "forming column construction equipment is relatively large, and because cement belongs to granular material, drilling diameter is larger, larger to the disturbance of existing construction of structures;
(3) when floral tube cement injection "forming column pile body hardens, with bleed, solid volume shrinks, and the calculus that makes to harden reduces with the adhesion strength of being filled with ground, has reduced bearing capacity of foundation soil;
(4) floral tube cement injection "forming column range of grouting is uncontrollable, as hole larger banket in, penetration radius is larger, easily causes the waste of cement grout;
(5) floral tube cement injection "forming column mainly regulates the grouting pressure of water under high pressure dredge pump, to the diameter of pile body, and influence basin, the shape of pile body is uncontrollable;
(6) floral tube cement injection "forming column slip casting pile body needs certain curing time could form intensity, and the reinforcing area of construction of structures is needed to closure construction, and production and operating activities are caused to certain influence.
Obviously, current floral tube cement injection "forming column is badly in need of its grouting serous fluid and grouting pile-forming device to improve, to avoid above-mentioned shortcoming.
Summary of the invention
The purpose of this utility model is according to above-mentioned the deficiencies in the prior art part, a kind of mini pile grouting pile-forming device is provided, this mini pile grouting pile-forming device is by being connected slip casting outer tube with dual-component polyurethane foaming machine, Grouting Pipe is stretched to slip casting outer tube inside, and be socketed flexible pile bag outward at slip casting outer tube, to form the grouting pile-forming device of mini pile.
The utility model object realizes and being completed by following technical scheme:
A kind of mini pile grouting pile-forming device, comprise dual-component polyurethane foaming machine, it is characterized in that described pile making device is made up of Grouting Pipe, slip casting outer tube and flexible pile bag, wherein said Grouting Pipe extends outward into described slip casting outer tube bottom from described dual-component polyurethane foaming machine delivery outlet, described slip casting outer tube one end connects described dual-component polyurethane foaming machine delivery outlet, the other end stretches into described flexible pile bag inside, and the sack of described flexible pile bag and described slip casting outer tube outer wall are tightly connected.
Stretch on the described slip casting outer tube wall of described flexible pile bag inside and be distributed with some slip casting eyelets.
The degree of depth that described slip casting outer tube stretches into described flexible pile bag is not less than the half of described flexible pile bag length.
Described flexible pile bag is the one in geotechnological cloth bag, cloth bag, plastic sheath, rubber sleeve, nylon fiber bag.
Described Grouting Pipe is the one in steel pipe, pvc pipe, ABS pipe, sleeve valve pipe.
Described slip casting outer tube is the one in steel pipe, pvc pipe, ABS pipe, sleeve valve pipe.
The utility model has the advantages that, the grouting pile-forming apparatus structure of mini pile is simple, construction simple and fast, and due to the flexible pile bag effect of slip casting outer tube periphery, the mini pile stake footpath that it becomes and the controlled and former slip of polyurethane reaction of stake type can arbitrarily not spread; In addition, its bearing capacity of single pile applying is high, build-in terrestrial capabilities is good, little by slurry amount, the duration is short, there will not be the quality accident in undergauge, disconnected footpath, is applicable to large-scale promotion application.
Brief description of the drawings
Fig. 1 is mini pile grouting pile-forming device schematic diagram in the utility model;
The mini pile schematic diagram that Fig. 2 becomes for utilizing grouting pile-forming device in the utility model;
Fig. 3 is the mini pile grouting pile-forming device schematic diagram being connected to form by many slip casting outer tubes in the utility model;
Fig. 4 utilizes grouting pile-forming device to apply the construction sequence schematic diagram of mini pile in the utility model.
Detailed description of the invention
Feature of the present utility model and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
As Fig. 1-4, in figure, mark 1-8 is respectively: slip casting outer tube 1, flexible pile bag 2, slip casting eyelet 3, polyurethane foam 4, cuff 5, stake hole 6, dual-component polyurethane foaming machine 7, Grouting Pipe 8.
Embodiment: the present embodiment is specifically related to a kind of grouting pile-forming device of mini pile, the mini pile that utilizes this grouting pile-forming device to apply can be applicable in the stabilization workss such as ground processing, construction of structures reinforcing and correction, flood control dam and column foot and side slope.
As shown in Figure 1, grouting pile-forming device in the present embodiment comprises dual-component polyurethane foaming machine 7, Grouting Pipe 8, slip casting outer tube 1 and flexible pile bag 2, in dual-component polyurethane foaming machine 7, store the former slip of polyurethane reaction, the delivery outlet of dual-component polyurethane foaming machine 7 is communicated with slip casting outer tube 1, Grouting Pipe 8 extends outward into the bottom of slip casting outer tube 1 from the delivery outlet of dual-component polyurethane foaming machine 7 simultaneously, flexible pile bag 2 is set in the outside of slip casting outer tube 1, and tighten and be fixedly connected with by cuff 5 between the mouth of pipe of the sack of flexible pile bag 2 and slip casting outer tube 1, be positioned at slip casting outer tube 1 in the tube wall part of flexible pile bag 2 and be distributed with some slip casting eyelets 3, so that the former slip of polyurethane reaction when slip casting can flow into and be full of flexible pile bag 2 from slip casting eyelet 3.Wherein, slip casting outer tube 1 and Grouting Pipe 8 can be the one in steel pipe, pvc pipe, ABS pipe or sleeve valve pipe, on the tube wall of slip casting outer tube 1 with slip casting eyelet 3; Flexible pile bag 2 can be the one in the satchels such as geotechnological cloth bag, cloth bag, plastic sheath, rubber sleeve, nylon fiber bag, it should be noted that the volume of flexible pile bag 2 is much larger than the volume of slip casting outer tube 1.
As shown in Figure 2 for the grouting pile-forming device by the present embodiment is applied the mini pile forming, this mini pile is arranged in the soil body with vertical or oblique attitude, polyurethane foam 4 and slip casting outer tube 1 and the cementing formation one of flexible pile bag 2 in it, wherein polyurethane foam 4 is, after being mixed by two kinds of components, fast chemical reaction occurs, expansion 5-30 times of a kind of high polymer that volume forms, be the resin that contains repetition-HNCO-O-group on main chain, the density of polyurethane foam 4 is 30kg/m
3-1000kg/m
3, its compressive strength is 0.5MPa-50MPa, polyurethane foam 4 and slip casting outer tube 1 and the underground vertical body of the cementing formation of peripheral flexible pile bag 2, i.e. and this mini pile, is 10cm-60cm with the polyurethane slip casting mini pile diameter of flexible pile bag, density is 30kg/m
3-1000kg/m
3, the long 0.5m-10m of stake.
As shown in Figure 3, in the present embodiment, slip casting hole-forming device is not limited to form the mini pile being made up of a slip casting outer tube 1 in practical engineering application, in the time that stake hole depth is larger, mini pile also can be connected and composed by two or many slip casting outer tubes 1, on each slip casting outer tube 1, is still tightened and is fixed with flexible pile bag 2 by cuff 5 separately.
Be illustrated in figure 4 the step schematic diagram that utilizes this slip casting hole-forming device to apply mini pile, its concrete steps are:
Pile hole 6 in step 1 ground:
As shown in Figure 4, become the stake hole 6 perpendicular to ground in ground, can or revolve according to traditional artificial shoveling pore-forming technique, spiral drilling machine soil taking hole forming technique to dig and drill through native pore-forming technique and implement, stake hole 6 diameters are 3cm-15cm, and hole depth is pressed designing pile length value; Pore-forming equipment is optional with engineering geological drilling rig, GPS-10 type circulation drill, DZ60KS type vibrating hammer immersed tube machine;
Step 2 slip casting outer tube 1 colligation flexible pile bag 2:
As shown in Figure 3,4, after stake hole 6 applies, verification holes position, hole depth and verticality, after all meeting the demands, slip casting outer tube 1 is inserted in flexible pile bag 2, and it is tight at slip casting outer tube 1 top, flexible pile bag 2 and slip casting outer tube 1 to be passed through to cuff 5 colligations, prevents that slurries from overflowing from top;
The slip casting outer tube 1 that step 3 is transferred the good flexible pile bag 2 of colligation enters a hole 6:
As shown in Figure 4, the slip casting outer tube 1 of the good flexible pile bag 2 of colligation is transferred and entered in a hole 6, if slip casting outer tube 1 is formed by connecting by more piece slip casting outer tube, before transferring, must guarantee that junction is tight;
Step 4 cast polyurethane reaction raw materials slurry:
As shown in Figure 3,4, park on the ground the dual-component polyurethane foaming machine 7 that stores the former slip of polyurethane reaction, the delivery outlet of dual-component polyurethane foaming machine 7 is connected with the top mouth of slip casting outer tube 1, extend outward a Grouting Pipe 8 and make its bottom stretch to slip casting outer tube 1 bottom at the delivery outlet of dual-component polyurethane foaming machine 7 simultaneously, a little more than the slip casting eyelet 3 of slip casting outer tube 1 bottom, to carry out the former slip casting of polyurethane reaction; Former polyurethane reaction slip is pumped on wall in the slip casting outer tube 1 with slip casting eyelet 3 through Grouting Pipe 8, grouting pressure by 0.1MPa-100MPa by slurries by the slip casting eyelet 3 on wall, be injected in flexible pile bag 2, there is chemical reaction from bottom to top and expand in the former slip of polyurethane reaction, generate polyurethane foam 4, flexible pile bag 2 be full of and support greatly, forming pile body, with the polyurethane slip casting mini pile of flexible pile bag; It should be noted that, the diameter of Grouting Pipe 8 is slightly less than slip casting outer tube 1, ensures that it can move freely in slip casting outer tube 1, and it needs at the uniform velocity upwards lift row slip casting again after a segment distance after the slip casting a period of time of each position; In dual-component polyurethane foaming machine 7, contain air circulation system, in slip casting stopped process, equipment produces the circulated air up to 20MPa, constantly blows out from Grouting Pipe 8, ensures that slip casting eyelet 3 can not stopped up and continue grouting pile-forming by polyurethane foam; The former slip of aforesaid polyurethane reaction is mixed by the injection of dual-component polyurethane foaming machine according to weight ratio 1:0.1～1:10 by A component and the B component of separating storage;
Wherein, A component comprises one or more cyanates, and this cyanate can be by general formula R (NCO)
nrepresent, wherein R represents containing the aliphatic alkyl of 2-18 carbon atom, containing the aryl of 6-15 carbon atom, containing 8-15 carbon atom aryl aliphatic hydrocarbyl, n=2-4;
Wherein, B component comprises polyalcohol, chain extender, blowing agent and catalyzer, described polyalcohol is the mixture of a kind of polyalcohol or multiple polyalcohol, the mean molecule quantity of polyalcohol is 100-10000, degree of functionality is 2-10, described chain extender is the mixture of one or more chain extenders, be molecular weight be less than 800 containing reactive hydrogen atom compound; Described blowing agent is selected water, halogenated hydrocarbons, hydrocarbon compound, gas etc., and consumption is the 0.3%-15.0% of polyalcohol and chain extender weight; Described catalyzer is amines catalyst, organo-metallic catalyst or their mixture, consumption is the 0.001%-10.0% of polyalcohol and chain extender weight, under-10 ° of C-100 ° of C, A component and B component are mixed generation chemical reaction, generate polyurethane foam 4,, polyurethane foam 4 is high polymers, is the resin that contains repetition-HNCO-O-group on main chain;
The optimal reaction temperature scope of the former slip of polyurethane reaction is 15-40 degree Celsius, and this dual-component polyurethane foaming machine 7 has heater, can be by heating raw materials to ensureing in slip casting process that fully reaction is expanded within the scope of this.
Mini pile and construction method thereof that grouting pile-forming device in the present embodiment becomes have following beneficial effect:
1. this grouting pile-forming apparatus structure is simple, and quick construction is easy, does not need curing time when pile: urethane raw injection, in 15 minutes, just there is sufficient chemical reaction, and have more than 90% intensity, can be engineering construction and save a large amount of durations;
2. the polyurethane slip casting mini pile intensity with flexible pile bag that grouting pile-forming device applies is high, and modulus of elasticity is large, and bearing capacity of single pile is high: after urethane raw injection, there is chemical reaction, form hard blocks, firmly cementing with slip casting outer tube, flexible pile bag, form vertical reinforcement;
3. the pile quality of grouting pile-forming device is good, bearing capacity is high: after urethane raw reaction, volume can expand rapidly, be up to 40 times of liquid volumes, produce the bulbs of pressure, and can there is not drying shrinkage in the polyurethane foam forming after reaction, surrounding soil is had to powerful squeezing action, so there will not be undergauge phenomenon, pile side resistance is large, bearing capacity is higher;
4. good endurance, polyurethane foam is inert material, resistance to chemical attack, in underground, ageing time is long, the performance of energy stable for extended periods of time;
5. environmental protection is pollution-free: polyurethane foam performance is stable, pollution-free, is embedded in for a long time undergroundly can not pollute underground; And due to the effect of peripheral flexible pile bag, urethane raw reacting slurry can arbitrarily not spread, and has protected underground environment; Urethane raw reacting slurry manufacturing process safety is controlled, and the environment pollution causing is more much lower than traditional materials such as cement.
Claims (6)
1. a mini pile grouting pile-forming device, comprise dual-component polyurethane foaming machine, it is characterized in that described pile making device is made up of Grouting Pipe, slip casting outer tube and flexible pile bag, wherein said Grouting Pipe extends outward into described slip casting outer tube bottom from described dual-component polyurethane foaming machine delivery outlet, described slip casting outer tube one end connects described dual-component polyurethane foaming machine delivery outlet, the other end stretches into described flexible pile bag inside, and the sack of described flexible pile bag and described slip casting outer tube outer wall are tightly connected.
2. a kind of mini pile grouting pile-forming device according to claim 1, is characterized in that stretching on the described slip casting outer tube wall of described flexible pile bag inside and is distributed with some slip casting eyelets.
3. a kind of mini pile grouting pile-forming device according to claim 1 and 2, is characterized in that the degree of depth that described slip casting outer tube stretches into described flexible pile bag is not less than the half of described flexible pile bag length.
4. a kind of mini pile grouting pile-forming device according to claim 1, is characterized in that described flexible pile bag is the one in geotechnological cloth bag, cloth bag, plastic sheath, rubber sleeve, nylon fiber bag.
5. a kind of mini pile grouting pile-forming device according to claim 1, is characterized in that described Grouting Pipe is the one in steel pipe, pvc pipe, ABS pipe, sleeve valve pipe.
6. a kind of mini pile grouting pile-forming device according to claim 1, is characterized in that described slip casting outer tube is the one in steel pipe, pvc pipe, ABS pipe, sleeve valve pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420054220.8U CN203782713U (en) | 2014-01-28 | 2014-01-28 | Micro pile grouting pile-forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420054220.8U CN203782713U (en) | 2014-01-28 | 2014-01-28 | Micro pile grouting pile-forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203782713U true CN203782713U (en) | 2014-08-20 |
Family
ID=51318915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420054220.8U Expired - Lifetime CN203782713U (en) | 2014-01-28 | 2014-01-28 | Micro pile grouting pile-forming device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203782713U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110331725A (en) * | 2019-04-25 | 2019-10-15 | 黄宗海 | A kind of construction method of water proof pouring underwater concrete |
| CN114482057A (en) * | 2021-12-27 | 2022-05-13 | 佛山科学技术学院 | Control device and method for pile side grouting reinforcement of pipe pile foundation |
-
2014
- 2014-01-28 CN CN201420054220.8U patent/CN203782713U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110331725A (en) * | 2019-04-25 | 2019-10-15 | 黄宗海 | A kind of construction method of water proof pouring underwater concrete |
| CN114482057A (en) * | 2021-12-27 | 2022-05-13 | 佛山科学技术学院 | Control device and method for pile side grouting reinforcement of pipe pile foundation |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140820 |
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| CX01 | Expiry of patent term |