CN105804072A - Slip casting pipe device, Y-shaped abnormal-shape pile with device in prefabricated manner and slip casting method of device - Google Patents
Slip casting pipe device, Y-shaped abnormal-shape pile with device in prefabricated manner and slip casting method of device Download PDFInfo
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- CN105804072A CN105804072A CN201610297071.1A CN201610297071A CN105804072A CN 105804072 A CN105804072 A CN 105804072A CN 201610297071 A CN201610297071 A CN 201610297071A CN 105804072 A CN105804072 A CN 105804072A
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- grouting
- slip casting
- pile
- pipe
- grouting pipe
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/50—Piles comprising both precast concrete portions and concrete portions cast in situ
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/16—Shapes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
Abstract
The invention relates to a slip casting pipe device. The slip casting pipe device comprises a plurality of circular slip casting pipes (2) and longitudinal slip casting pipes (1) which are arranged on different fracture surfaces, all longitudinal slip casting pipes (1) are distributed in the axial direction, openings (11) of the longitudinal slip casting pipes (1) are exposed out of a pile top, and all longitudinal slip casting pipes (1) are evenly distributed at intervals. The invention further discloses a Y-shaped abnormal-shape pile with the slip casting pipe device in a prefabricated manner and a slip casting method of the device. A three-tube annular point-type slip casting manner is adopted, an annular pipe for slip casting is arranged at the preset depth position of a pile side, slip casting holes are formed in an anti-arch curve face of the Y-shaped abnormal-shape pile, annular pile side slip casting is formed, and the annular pipe and a longitudinal slip casting guide pipe are connected. By means of the slip casting pipe device and the slip casting method, by changing the contact interface character of a pile body of the Y-shaped abnormal-shape pile and soil around the pile, the shortcoming of insufficient pile side friction caused by insufficient strength of the soil around the pile is overcome, the bearing force of the pile is greatly improved, and pile foundation sedimentation is reduced.
Description
Technical field
The invention belongs to Geotechnical Engineering field, relate to Y type shaped pile structure and grouting method thereof.
Background technology
Y type driven cast-in-place pile expands principle according to uiform section special-shaped periphery, it is derived from typical round driven cast-in-place pile, being a kind of Novel pile being improved development on the basis of tradition bored concrete pile, its section configuration is the curved line trangle of circular arc line 3 sections inside, additional 3 wedge angles composition.Y type stake maintains the advantage of tradition driven cast-in-place pile, makes full use of the increase with the moment of inertia of the uiform section not rounded stake side surface area to increase shaft resistance and horizontal bearing performance.Adopt the construction equipment of common driven cast-in-place pile, only circle stake mould is changed into Y type stake mould, and adjusts in construction technology, saving construction cost 20%～25% compared with other similar technique.
China's Coastal Areas also exists much complex soft soil foundation, must carry out consolidation process when changing roadbed dam constructions such as building intercity speed rail, high-speed railway, municipal administration, water conservancy on ground.Owing to Y type pile driving construction equipment is simple, easy construction, cost is low, speed of application is fast, the duration is short, and this technology is applied in foundation stabilization field at present, such as Shen JZA area, the expressway bridge head treatment of soft foundation of Hang Pu, Shen Jia lake.Correlational study shows, this has bigger economical, societal benefits and wide application prospect.In addition, China is riverine, coastal area, and rich groundwater, depth to water be 1～3m under earth's surface generally, and along with underground space development is to deep layer and large-scale development, underground engineering anti-floating problem under groundwater effect is more and more prominent.From underground engineering anti-floating technology, arranging uplift pile is current the most commonly used mode.Relatively conventional Uniform-section Piles, the novel uplift pile such as club-footed pile and stake rear flank grouting pile is greatly improved bearing capacity with the increase of less material, has a extensive future, but for layer of sand, the construction of reaming and detection become extremely difficult；And when stake is long, club-footed pile changes bottom expanding drill also can affect work efficiency so that the application of base expanding and base expanding uplift pile receives certain restriction, and the slip casting uplift pile of stake rear flank then shows distinctive advantage, the contact interface characteristic of pile body and soil around pile is changed, thus improving bearing capacity by slip casting.
Due to the interaction of the polytropy of soil layer property and stake soil, pile side friction has complexity.The major influence factors of utmost tip resistance can be summarized as a soil material characteristic, stake Soil Interface characteristic, pile constructing process.But Practical Project finds, along with end supporting condition, stake Impact direction, close on the character of soil layer, soil layer the concrete engineering condition such as the degree of depth different, side friction also has very big variation.When soil around pile self-strength deficiency, as having settlement by soaking, dilatancy, liquescence etc., then Y type pile side friction can be made to play deficiency.
Current slip casting around pile technology is only for prismatic stake, but widely using along with Y type shaped pile, it is necessary to the pile side friction deficiency of Y type shaped pile is carried out necessary improvement.
Summary of the invention
It is an object of the invention to provide the Y type shaped pile of a kind of prefabricated grouting pipeline device and grouting method thereof, side friction is compensated by slip casting around pile, to solve owing to soil around pile self-strength is not enough, or construction technology not good enough time, abnormity friction pile or the not enough technical problem of abnormity point friction pile side friction.
For reaching above-mentioned purpose, the solution of the present invention is:
A kind of grouting pipeline device, described grouting pipeline device includes the some hoop Grouting Pipe and the longitudinal direction Grouting Pipe that are arranged on different section, each bar longitudinal direction Grouting Pipe is all axially disposed, and the opening of longitudinal Grouting Pipe is exposed to stake top, and between each bar longitudinal direction Grouting Pipe, uniform intervals is arranged.
Consistent with the diameter of hoop Grouting Pipe by the axis projection determined diameter of a circle of point of each longitudinal Grouting Pipe.
The orientation of each bar longitudinal direction Grouting Pipe is each perpendicular to each hoop Grouting Pipe, and each bar longitudinal direction Grouting Pipe is all connected with each hoop Grouting Pipe；Preferably, between the two can by one-body molded connection, it is also possible to connected by arc connector transition.
Being prefabricated with the Y type shaped pile of described grouting pipeline device, predetermined buried depth place, stake side arranges annular Grouting Pipe, and arranges injected hole at antiarch curved surface；Slurry casting machine is positioned at cement paste around pile hole place, is fixed on by slurry casting machine in annular Grouting Pipe simultaneously；Each longitudinal grouting pipe is tangent with antiarch curved surface, and forms the inscribed circle of respective diameters, and ring pipe connects with longitudinal grouting pipe, in order to grouting serous fluid flows to ring duct by longitudinal duct from ground, arrives predetermined buried depth place.
By together prefabricated to Y type shaped pile and grouting pipeline device.The grouting device adopted is three pipe ring form point formula grouting modes, including longitudinal grouting pipe, hoop grouting pipe, slurry casting machine three part.The predetermined buried depth place of stake side arranges the ring pipe of grouting, and arranges injected hole in order to place slurry casting machine at Y type stake antiarch curved surface, forms the slip casting around pile of ring-type, and ring pipe connects with longitudinal grouting pipe so that grouting serous fluid can from ground supply.Meanwhile, in conjunction with grouting method, control grouting amount, grouting serous fluid type and slip casting and stop index, make shaped pile pile side friction increase.
During prefabricated Y type shaped pile, three pipe ring form point formula grouting pipeline devices are together imbedded.When pile side friction deficiency being detected, (now pile body has imbedded soil layer, slurry casting machine has been connected on injected hole), the method of plug (what open is longitudinal grouting pipe plug of exposing stake top) slip casting is opened in utilization, floor height pressure grouting peripherally, thus reinforcing Pile side soil, improve the resistance to compression resistance to plucking side friction of stake.
Three pipe ring form point formula grouting pipelines include the longitudinal grouting pipe adopting the standard black iron pipe of 25mm internal diameter, it is contemplated that the pipe inner frictional resistance impact on pressure, it is contemplated that adopt the black pipe of 30mm internal diameter.Adopt high pressure composite hose, with the ring pipe that slurry casting machine connects with longitudinal grouting pipe.The slurry casting machine of check valve-type structure.
Longitudinal grouting pipe position is the midpoint of antiarch curve, and therefore, three longitudinal grouting pipe can form the circle that radius is r, the radius of the circle that the radius of ring pipe surrounds with longitudinal grouting pipe.
Prefabricated slip casting section and section spacing select according to Practical Project geological conditions, and the soil layer that geological conditions is poor, slip casting section interval takes relatively small value；Otherwise, take relatively large value.
Each slip casting section arranges 1 injected hole along stake week in antiarch center of surface, and namely each slip casting section is made up of 3 injected holes.Considering the intensity of pile body self, too much perforate can reduce pile strength, causes the pile body fracture when press-in prefabricated pile, therefore only can arrange an injected hole at the antiarch curved surface place of each slip casting section in a preferred embodiment.
The design grouting amount of each section is 0.4～0.6t, should select according to stake footpath, and stake footpath is more big, and grouting amount takes large values.
Proportioning and the choosing of material of grouting serous fluid should for the purpose of smooth slip castings, by slip casting time and serum viscosity as Con trolling index, grouting serous fluid selects 42.5R Portland cement, and slurry water gray scale 0.6～0.7, the grouting pressure of slip casting point controls at 2.2～2.4MPa.
Adopt grouting amount and grouting pressure dual control method, after grouting pressure meets and exceeds default maximum grouting pressure, stop mortar depositing construction movable, dynamic monitoring should be coordinated simultaneously, the existing structure (building) of periphery is built thing and carries out displacement monitoring, when displacement exceedes its safety value, it should stop slip casting activity immediately.
Owing to adopting technique scheme, the method have the advantages that
1, slip casting around pile technology is combined with widely used shaped pile; have devised three pipe ring form point formula grouting pipelines; namely serosity is by infiltration, crowd in-out effects; the soil body making stake week certain area forms entirety with pile body; add between pile body with soil around pile contact coarse; thus improving pile side friction, reduce the deformation of stake, protection existing structure and surrounding enviroment.
2, the layout of slip casting section and grouting pipeline is designed according to pile installation, and therefore this grouting device and grouting method are little on the impact of pile body overall structure stress performance.
3, utilize this device can break through the restrictive condition that uplift pile stake is long, still can play the effect increasing side friction for the part below ultra-long pile critical depth, be effectively controlled pile body sedimentation, improve the performance of abnormity friction pile.
Accompanying drawing explanation
Fig. 1 is the prefabricated grouting pipeline device appearance figure of embodiment of the present invention Y type shaped pile.
Fig. 2 is the prefabricated grouting pipeline apparatus structure elevation of the shaped pile of Y type shown in Fig. 1.
Fig. 3 is slurry casting machine present position partial enlarged drawing in structural facades figure shown in Fig. 2.
Fig. 4 adopts Y type shaped pile to carry out the example schematic of foundation stabilization under certain formation condition.
Labelling in accompanying drawing: 1-longitudinal direction Grouting Pipe, 2-hoop Grouting Pipe, 3-injected hole, 4 slurry casting machines, 5-artificial earth fill, 6-muck soil, 7-Muddy Bottoms Extra-fine sand, 8-muck soil, 9-medium-sand seam, 10-gravel layer.
Detailed description of the invention
Below in conjunction with accompanying drawing illustrated embodiment, the present invention is further illustrated.
As Figure 1-3, an embodiment of the present invention schematic diagram, the pile body 5 of this Y type shaped pile is prefabricated with grouting pipeline device, four hoop Grouting Pipe 2 that described grouting pipeline device includes being arranged on different section and three longitudinal Grouting Pipe 1, each bar longitudinal direction Grouting Pipe 1 all axial arranged along pile body 5, the opening 11 of longitudinal Grouting Pipe 1 is exposed to stake top, and between each bar longitudinal direction Grouting Pipe 1, uniform intervals is arranged；Within each bar longitudinal direction Grouting Pipe 1 is respectively positioned on this point of contact, three antiarch Curved arc tops of Y type shaped pile, for instance 20cm place, consistent with the diameter of hoop Grouting Pipe 2 by the axis projection confirmable diameter of a circle of point of three longitudinal Grouting Pipe 1.
The present embodiment have employed four hoop Grouting Pipe；Being likely to the hoop Grouting Pipe adopting other quantity in practice, the soil layer reinforced as required determines that how many sections of needs are determined.
The orientation of each bar longitudinal direction Grouting Pipe 1 is each perpendicular to each hoop Grouting Pipe 2, and each bar longitudinal direction Grouting Pipe 1 is all connected with each hoop Grouting Pipe 2.Between the two can by one-body molded connection, it is also possible to connected by arc connector transition.
The Y type shaped pile grouting pipeline device of the present invention, adopts three pipe ring form point formula grouting modes.This grouting pipeline includes three parts: longitudinal grouting pipe 1, annular Grouting Pipe 2 and slurry casting machine 4.
Stake predetermined buried depth place, side arranges annular Grouting Pipe, as in figure 2 it is shown, and arrange injected hole 3 at antiarch curved surface；Slurry casting machine 4 is positioned at cement paste around pile hole 3 place, is fixed on by slurry casting machine 4 in annular Grouting Pipe 2 simultaneously, forms the slip casting around pile of ring-type；Serosity annular grouting pipe in, by the pressure of slurry casting machine, serosity is pressed into soil layer.
Three longitudinal grouting pipe are tangent with antiarch curved surface, and form the inscribed circle of certain diameter, and ring pipe connects with longitudinal grouting pipe, in order to grouting serous fluid flows to ring duct by longitudinal duct from ground, arrives predetermined buried depth place.Relation between grouting pipeline each several part is as shown in Figure 2 and Figure 3.
Preferably, long stake longitudinal direction grouting pipe adopts the standard black iron pipe of internal diameter 25mm, and ultra-long pile longitudinal direction grouting pipe adopts the black pipe of internal diameter 30mm；Annular Grouting Pipe adopts compound high pressure hose；Slurry casting machine is check valve-type structure.
It may further be preferable that consider the impact that pile body is caused by whole pilework stability and slip casting itself, slip casting section spacing selects according to Practical Project geological conditions according to prefabricated slip casting section and section spacing；It is said that in general, the soil layer that geological conditions is poor, slip casting section interval takes relatively small value；Otherwise, take relatively large value.
Further preferably, the design grouting amount of each section is 0.4～0.6t, and stake footpath is more big, and selected grouting amount should be more big.
It is even furthermore preferable that selected grouting serous fluid is 42.5R Portland cement, slurry water gray scale 0.6～0.7, the grouting pressure of slip casting point controls at 2.2～2.4MPa.
Further preferably, stop slip casting and adopt grouting amount and grouting pressure dual control method, namely after grouting pressure meets and exceeds default maximum grouting pressure, stop slip casting activity；Dynamic monitoring should be coordinated simultaneously, the existing structure (building) of periphery be built thing and carries out displacement monitoring, when displacement exceedes its safety value, it should stop slip casting activity immediately.
Example 1
As shown in Figure 4, for adopting Y type shaped pile to carry out the example of foundation stabilization under certain formation condition.The Y type stake parameter adopted in this engineering is as follows: outsourcing radius of circle R is 0.5m, and antiarch curve radian θ is 60 degree, and open arc distance s is 0.12m, and angle number of degrees δ is 90, the long 25m of stake.
Grouting pipeline device is together prefabricated with Y type stake, consider that soil layer situation is 3m for artificial earth fill 5 thickness, mud 6 thickness is 4m, and Muddy Bottoms Extra-fine sand 7 thickness is 5m, and muck soil 8 thickness is 4m, medium-sand seam 9 thickness is 5m, gravel layer 10 thickness is 10m, therefore first road slip casting section distance stake top 5m, it is contemplated that the permeability of soil around pile self-characteristic and grouting serous fluid and penetration radius, every layer of soil layer all has at least one slip casting section, and therefore slip casting section spacing is 6m in the present embodiment.
Owing to this example king-pile length is 25m, belong to long stake, therefore the standard black iron pipe that longitudinal grouting pipe is diameter 25mm in grouting pipeline device；Parameter according to Y type shaped pile, the cross section radius of circle r of longitudinal grouting pipe composition is 1m, and therefore the diameter of annular Grouting Pipe is 1m, selects check valve-type slurry casting machine.
The grouting amount of usual single section is 0.4～0.6t, but the outsourcing radius of circle size according to Y type stake, designed single section grouting amount is 0.5t.The ratio of mud of usual serosity is 0.6～0.7, and grouting pressure is 2.2～2.4MPa, but owing to Y type stake soil around pile mostly is sandy soils, therefore grouting serous fluid is 42.5R Portland cement, and slurry water gray scale is 0.6；The grouting pressure of slip casting point selects 2.2MPa, when stratum residing for section is the little Soft Soil Layer of infiltration coefficient, increases pressure to 2.3MPa.
Grouting method is: utilize immersed tunnelling method to squeeze in stratum prefabricated Y type stake, starts slip casting after pile 5d.During slip casting from top to bottom, down slip casting successively again after a upper section has certain initial setting strength, interval time is pressed 1h control in the slip casting of each section.When grouting pressure exceedes maximum grouting pressure or serosity reaches the 70% of predetermined value, pumping pressure is more than 4.0MPa, and stops slip casting when holding lotus 3min.
By to the detection of pile side friction after Y type stake slip casting around pile, its performance rises to the twice of the Y type stake pile side friction of non-grouting and reinforcing.
The above-mentioned description to embodiment is to be understood that for the ease of those skilled in the art and apply the present invention.These embodiments obviously easily can be made various amendment by person skilled in the art, and General Principle described herein is applied in other embodiments without through performing creative labour.Therefore, the invention is not restricted to embodiment here, those skilled in the art's announcement according to the present invention, the improvement made without departing from scope and amendment all should within protection scope of the present invention.
Claims (10)
1. a grouting pipeline device, it is characterized in that: described grouting pipeline device includes the some hoop Grouting Pipe (2) and longitudinal direction Grouting Pipe (1) that are arranged on different section, each bar longitudinal direction Grouting Pipe is all axially disposed, the opening (11) of longitudinal Grouting Pipe (1) is exposed to stake top, and between each bar longitudinal direction Grouting Pipe (1), uniform intervals is arranged.
2. grouting pipeline device according to claim 1, it is characterised in that: consistent with the diameter of hoop Grouting Pipe (2) by the axis projection determined diameter of a circle of point of each longitudinal Grouting Pipe.
3. grouting pipeline device according to claim 1, it is characterized in that: the orientation of each bar longitudinal direction Grouting Pipe (1) is each perpendicular to each hoop Grouting Pipe (2), and each bar longitudinal direction Grouting Pipe (1) is all connected with each hoop Grouting Pipe (2)；Preferably, between the two can by one-body molded connection, it is also possible to connected by arc connector transition.
4. the Y type shaped pile of to be prefabricated with in claims 1 to 3 arbitrary described grouting pipeline device, it is characterised in that:
Stake predetermined buried depth place, side arranges annular Grouting Pipe, and arranges injected hole (3) at antiarch curved surface；Slurry casting machine (4) is positioned at cement paste around pile hole (3) place, is fixed on by slurry casting machine (4) in annular Grouting Pipe (2) simultaneously；Each longitudinal grouting pipe is tangent with antiarch curved surface, and forms the inscribed circle of respective diameters, and ring pipe connects with longitudinal grouting pipe, in order to grouting serous fluid flows to ring duct by longitudinal duct from ground, arrives predetermined buried depth place.
5. Y type shaped pile according to claim 4, it is characterised in that:
Longitudinal grouting pipe position is the midpoint of antiarch curve；Preferably, described long stake longitudinal direction grouting pipe adopts the standard black iron pipe of internal diameter 25mm, and ultra-long pile longitudinal direction grouting pipe adopts the black pipe of internal diameter 30mm；Annular Grouting Pipe adopts compound high pressure hose；Preferably, described slurry casting machine is check valve-type structure.
6. Y type shaped pile according to claim 4, it is characterised in that: slip casting section spacing is determined according to Practical Project geological conditions according to prefabricated slip casting section and section spacing: the soil layer of features as poor geologic condition, and slip casting section interval takes relatively small value；Otherwise, take relatively large value.
7. Y type shaped pile according to claim 4, it is characterised in that: each slip casting section arranges an injected hole along stake week in antiarch center of surface, and each slip casting section includes three injected holes；Preferably, the design grouting amount of each slip casting section is 0.4～0.6t, and stake footpath is more big, and selected grouting amount is more big.
8. the grouting method of the Y type shaped pile of the prefabricated grouting pipeline device described in claim 4, it is characterised in that:
When pile side friction deficiency being detected, utilizing the method opening plug slip casting, floor height pressure grouting peripherally, thus reinforcing Pile side soil, improving the resistance to compression resistance to plucking side friction of Y type shaped pile.
9. the grouting method of the Y type shaped pile of prefabricated grouting pipeline device according to claim 8, it is characterised in that: the proportioning of grouting serous fluid and material choose for the purpose of smooth slip casting, using slip casting time and serum viscosity as Con trolling index；Preferably, grouting serous fluid selects 42.5R Portland cement, and slurry water gray scale 0.6～0.7, the grouting pressure of slip casting point controls at 2.2～2.4MPa.
10. the grouting method of the Y type shaped pile of prefabricated grouting pipeline device according to claim 8, it is characterized in that: adopt grouting amount and grouting pressure dual control method, after grouting pressure meets and exceeds default maximum grouting pressure, stop mortar depositing construction movable, dynamic monitoring should be coordinated simultaneously, periphery existing building is carried out displacement monitoring, when displacement exceedes its safety value, it should stop slip casting activity immediately.
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| CN201610297071.1A CN105804072A (en) | 2016-05-06 | 2016-05-06 | Slip casting pipe device, Y-shaped abnormal-shape pile with device in prefabricated manner and slip casting method of device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610297071.1A CN105804072A (en) | 2016-05-06 | 2016-05-06 | Slip casting pipe device, Y-shaped abnormal-shape pile with device in prefabricated manner and slip casting method of device |
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| CN105804072A true CN105804072A (en) | 2016-07-27 |
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| CN201610297071.1A Pending CN105804072A (en) | 2016-05-06 | 2016-05-06 | Slip casting pipe device, Y-shaped abnormal-shape pile with device in prefabricated manner and slip casting method of device |
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| CN107794925A (en) * | 2017-10-31 | 2018-03-13 | 浙江大学城市学院 | The grouting behind shaft or drift lining cast-in-situ concrete thin-wall and construction method of a kind of reserved grouting pipeline |
| CN111074882A (en) * | 2019-12-16 | 2020-04-28 | 温州中领建设有限公司 | Multiple three-dimensional cast-in-place pile structure and method for casting pile body |
| CN111945703A (en) * | 2020-08-19 | 2020-11-17 | 福建省燕城建设工程有限公司 | Drainage structure for foundation stabilization and drainage method thereof |
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| CN111945703A (en) * | 2020-08-19 | 2020-11-17 | 福建省燕城建设工程有限公司 | Drainage structure for foundation stabilization and drainage method thereof |
| CN111945703B (en) * | 2020-08-19 | 2021-10-19 | 福建省燕城建设工程有限公司 | Drainage structure for foundation stabilization and drainage method thereof |
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