CN102296632A - Manufacturing method of PCC (Cast-in-Place Concrete Large-Diameter Pipe Pile) underground storage well in soft soil region - Google Patents
Manufacturing method of PCC (Cast-in-Place Concrete Large-Diameter Pipe Pile) underground storage well in soft soil region Download PDFInfo
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- CN102296632A CN102296632A CN2011101652140A CN201110165214A CN102296632A CN 102296632 A CN102296632 A CN 102296632A CN 2011101652140 A CN2011101652140 A CN 2011101652140A CN 201110165214 A CN201110165214 A CN 201110165214A CN 102296632 A CN102296632 A CN 102296632A
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Abstract
The invention discloses a manufacturing method of a (Cast-in-Place Concrete Large-Diameter Pipe Pile) underground storage well in a soft soil region, which comprises the following technical steps of: constructing a PCC; curing concrete; dewatering a construction site; digging pile core soil; gouging for removing partial pile bottom concrete so that a 20-30cm reinforcing steel bar is exposed from the pile head to be used as a connecting reinforcing steel bar or punching the pile wall, and exposing a reinforcement cage; putting a bottom plate reinforcing steel bar and connecting with a pile end connecting reinforcing steel bar or connecting with a pile wall reinforcement cage; pouring a concrete bottom plate for back sealing; manufacturing a pile head cover plate; and earthing on a cover plate to form the underground storage well. The storage well has a depth of 10-30m, an internal diameter of 1.5-4m, and a maximum capacity of reaching 370cm<3>. The movable cover plate is adopted in the storage well and can be fixed with the pile head together, and a conveying pipeline can be arranged according to the demands. The manufacturing method has the advantages of matured technology, safety, economy, convenience for quality inspection, high construction efficiency and strong engineering practical applicability, and effective solving of the problem of the construction of the underground storage well in the soft soil region.
Description
Technical field
The invention belongs to the civil construction project technical field, particularly a kind of soft clay area PCC stake subsurface storage well preparation method.
Background technology
The storage well is the primary structure form of subterranean reservoir, can store goods and materials such as oil, natural gas, food, fertilizer.Than laying on the ground, subterranean reservoir has following advantage: the one, and safety and environmental protection can effectively prevent thunderbolt, the attack of terrorism and earthquake etc., helps the strategic security of country.Simultaneously, the subterranean reservoir accident rate is low, and in a single day deposit has an accident on the ground, pollutes very big.The 2nd, save the soil.It only is 1/10th of storehouse, ground that the ground installation of subterranean reservoir takes up an area of, and has saved floor space greatly, and this is very favourable for the national conditions that China has a large population and a few land.The energy, material etc. are stored in underground, can tackle influences such as the energy under the extreme condition (war, terror, earthquake etc.), material interruption.The subterranean reservoir of strengthening the energy, material is one of important measures of safeguarding national security.
Build the storage well in soft clay area and exist a complicated technology difficult problem.If will store well build on the soft foundation, then need soft foundation is carried out consolidation process, the bearing capacity and the sedimentation of ground storage well can be met design requirement, and the expense that ground is handled is very high, this way is uneconomical, and takies ground space.If will store well build the underground of soft foundation in, when building the subsurface storage well, need excavate foundation soil, but weak soil has characteristics such as high-compressibility, low-intensity, hole wall is difficult for supporting during excavation, very easily forms the hole of collapsing, so soft clay area will be excavated very difficulty of deep-well.
Before the present invention; the cast-in-situ concrete large-diameter tubular pile (abbreviates the PCC stake as; patent No. ZL02112538.4 and ZL01273182.X) adopt mode of vibration with steel internal and external double-layer cavity structure under the flap valve shoe protection of closure; sink to the ground projected depth; in this structural cavities, evenly inject concrete by the concrete current divider; this cavity structure is transferred in vibration then; the flap valve shoe separates when this cavity structure is transferred to automatically; concrete injects cavity structure to be transferred in the cannelure of back formation, forms cast-in-place concrete thin-walled pile tube.The PCC stake obtains bigger bearing capacity with less concrete amount, is the superior stake type of a kind of economical rationality, cost performance therefore.
The advantage of PCC stake is to be suitable for the ground stabilization processing of soft clay area, and work progress is clear, pile quality is reliable.Because PCC stake diameter is bigger, can obtain bigger internal cavity space by excavation stake core soil, for research and development storage well provides condition.But PCC stake stake core bottom remains soil layer behind the excavation stake core, does not therefore possess sealing, needs further to transform.
Summary of the invention
The objective of the invention is to based on PCC stake technology,, provide a kind of soft clay area PCC stake subsurface storage well preparation method by transformation to PCC stake pile body.
A kind of soft clay area PCC stake of the present invention subsurface storage well preparation method adopts following technical step to realize:
The first step: in place construction PCC stake;
Second step: PCC pile body concrete curing: make the pile body concrete curing reach the intensity of next step construction safety;
The 3rd step: at the bottom of construction plant groundwater table elevation is higher than PCC stake stake during elevation, and when higher, a circle well-points dewatering is set around storage well construction place near the stake core soil permeability at the stake end;
Elevation at the bottom of construction plant groundwater table elevation is higher than PCC stake stake, and when hanging down near the stake core soil permeability at the stake end, do not excavate at the bottom of the stake during excavation stake core soil, the end a 1 ~ 1.5m stops excavation in distance, the stake core soil layer of hypotonicity plays sealing function, prevents that underground water from entering tube chamber;
During elevation, directly excavation stake core soil is to the following 30 ~ 50cm of stake end absolute altitude at the bottom of construction plant groundwater table elevation is lower than PCC stake stake;
The 4th step: excavation stake core soil:
The 5th step: in the time of at the bottom of stake core soil excavates stake, cut part stake base concrete, make stake hold the steel bar end that exposes 20 ~ 30cm, as connecting reinforcement; In the time of at the bottom of stake core soil does not excavate stake, will store the bottom pile lining with instruments such as electric impact drills and punch the formation hole, expose the reinforcing bar of PCC stake pile body;
The 6th step: transfer the base plate reinforcing bar, and be connected, or be connected with PCC stake pile body reinforcing cage in the pile lining hole with stake end connecting reinforcement;
The 7th step: the concreting base plate carries out back cover, carries out the underplate concrete maintenance, and security intensity to be reached can stop precipitation;
The 8th step: make the pile crown cover plate: cover plate can adopt exposed according to requirement of engineering, directly exposes the face of land; Or the employing flush type, imbed underground certain depth, cover plate is installed back soil layer backfill, forms the subsurface storage well.
Advantage of the present invention and effect are:
(1) PCC stake technology maturation is transformed the back with the PCC stake and is formed the storage well, do not have the difficulty on the construction technology, and PCC stake pile-forming speed is fast, can carry out large-area construction, builds a collection of soft clay area storage well simultaneously;
(2) have the part soil compaction effect during PCC pile driving construction, can make stake week soil compacted, increase pile side friction, so the PCC stake has very big bearing capacity, can not cause the sedimentation of well body behind the storage well storing because of the increase of weight;
(3) in PCC stake stake core when excavation soil, can adopt water under high pressure to dash, and extracts out with slush pump after making a core soil form mud again, avoided hand excavation's danger, and the efficiency of construction height;
(4) the PCC stake that construction earlier is good penetrates soft layer, plays support action after stake core soil takes out, and has effectively prevented the hole of collapsing.No longer need prefabricated casing, PCC pile driving construction speed is fast, has saved the time;
(5) PCC stake pile body diameter is big, can be directly when supporting capacity height, pore-forming are checked the workman be transferred to the hole by lifting rope at the bottom of, at the bottom of the hole, check hole quality, the clear hole slagging-off of the stake end thoroughly, clean, easily guarantee the concrete pouring quality.
(6) after the concrete setting, be subjected to the effect of uniform soil pressure around the pile body, the pile body concrete all is in pressured state, and concrete crushing strength is very high, therefore construction period and operating period safety are all very high, can not damage and lose because of the hole of collapsing.
The technology of the present invention maturation, safety, economy, quality examination is easy, efficiency of construction is high, and formed subsurface storage well bearing capacity height, good airproof performance, volume are big, efficiently solves the construction problem of soft clay area subsurface storage well, and engineering practicability is strong.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.Protection scope of the present invention is not exceeded with the specific embodiment, but is limited by claim.
Description of drawings
Fig. 1 structural representation of the present invention;
Fig. 2 base plate reinforcing bar of the present invention connection diagram;
Fig. 3 cover plate of the present invention schematic diagram that bassets;
Fig. 4 reserve part stake of the present invention core soil schematic diagram.
Among the figure: 1 is the PCC stake, and 2 is reinforcing cage, and 3 is base plate, and 4 is bearing stratum, and 5 is the weak soil layer, and 6 is cover plate, and 7 is the base plate reinforcing bar, and 8 for pricking silk, and 9 is connecting reinforcement, and 10 is earthing, and 11 is bottom stake core soil.
The specific embodiment
As Fig. 1 ~ shown in Figure 4, a kind of soft clay area PCC stake subsurface storage well preparation method, concrete steps are:
(1) PCC stake pile-forming machine perching is with flapper pile tip align piles position.
(2) the auxiliary vibration sinking tube of static pressure.Can stake be molded into the ground certain depth by machinery deadweight at the beginning, to be subjected to resistance bigger when the stake mould, sinks at need, opens vibration head, adopts the mode of vibration sinking tube that the stake mould is squeezed into the ground projected depth.
(3) remove vibration head, again vibration head is connected a mould top after transferring reinforcing cage.
(4) concrete perfusion, the vibration pipe-drawing pile.For guaranteeing stake top and its underpart concrete strength, the pipe-pulling speed in soft layer is preferably (0.6～0.8) m/min; In loose or close slightly sand layer, be preferably (1.0～1.2) m/min; At soft or hard place alternately, pipe-pulling speed should not be greater than 1.0m/min, and stops pulling out in this position and stay the 10s that shakes.
(5) concrete curing.Must make the pile body concrete curing reach certain intensity and just can enter next step to guarantee construction safety.
(6) construction plant precipitation.At the bottom of being higher than PCC stake stake, construction plant groundwater table elevation during elevation, a circle well-points dewatering is set around storage well construction place, otherwise, directly enter step (7).
(7) excavation stake core soil.Can adopt manual type excavation, also can adopt high pressure water washing stake core soil to form mud after, extract a core soil with slush pump.Stake core soil cutting depth should be below absolute altitude at the bottom of the stake 30 ~ 50cm.
(8) cut part stake base concrete, make stake hold the steel bar end that exposes 20 ~ 30cm, as connecting reinforcement.
(9) transfer the base plate reinforcing bar, and be connected with stake end connecting reinforcement.
(10) the concreting base plate carries out back cover, carries out the underplate concrete maintenance, waits to reach certain intensity and can stop precipitation.
(11) make the pile crown cover plate.Cover plate can adopt exposed according to requirement of engineering, directly exposes the face of land; Or the employing flush type, imbed underground certain depth.
(12) if adopt the flush type cover plate, cover plate is installed back soil layer backfill, forms the subsurface storage well.
The pile sinking degree of depth 10 ~ 30m of described PCC stake, interior diameter 1.5 ~ 4m, the storage well volume of formation can reach 20 ~ 370m
3
Soft layer is passed in described PCC stake, with soil layer preferably as bearing stratum.
In the described step (2), when the stake mould runs into hard interbedded layer, can keep away stake by heavy model slurry device and be lubricated.
The vibration head that described step (2) adopts can be the high frequency hydraulic vibration driver.
The cover plate of described step (11) can adopt movable according to requirement of engineering, also can be fixed together with pile crown.Can be the steel cover plate, also can be the steel concrete cover plate.
Described storage well end face cover plate absolute altitude can be lower than ground, covers with soil on the cover plate, is convenient to insulation.Cover plate can be provided with a hole as required, will store well by pipeline and be communicated to outside the well, so that the reserve of conveyance conduit the inside, as oil etc.
Following technical step also can be adopted in described step (6) ~ (9):
(6) at the bottom of construction plant groundwater table elevation is higher than PCC stake stake during elevation, and when higher, a circle well-points dewatering is set around storage well construction place near the stake core soil permeability at the stake end.
Elevation at the bottom of construction plant groundwater table elevation is higher than PCC stake stake, and when hanging down near the stake core soil permeability at the stake end, do not excavate at the bottom of the stake during excavation stake core soil, the end a 1 ~ 1.5m stops excavation in distance, the stake core soil layer of hypotonicity plays sealing function, prevents that underground water from entering tube chamber.
During elevation, directly excavation stake core soil is to the following 30 ~ 50cm of stake end absolute altitude at the bottom of construction plant groundwater table elevation is lower than PCC stake stake.
(7) excavation stake core soil.Can adopt manual type excavation, also can adopt high pressure water washing stake core soil to form mud after, extract a core soil with slush pump.
(8) in the time of at the bottom of stake core soil excavates stake, cut part stake base concrete, make stake hold the steel bar end that exposes 20 ~ 30cm, as connecting reinforcement.In the time of at the bottom of stake core soil does not excavate stake, will store the bottom pile lining with instruments such as electric impact drills and punch the formation hole, expose the reinforcing bar of PCC stake pile body.
(9) transfer the base plate reinforcing bar, and be connected, or be connected with PCC stake pile body reinforcing bar in the pile lining hole with stake end connecting reinforcement.
During site operation, smooth place if weak soil layer 5 directly is exposed to the face of land, then needs weak soil layer 5 surface are handled earlier, can lay the bed course of 30 ~ 50cm in the above, marches into the arena with convenient construction machinery.PCC stake stake machine is moved on to the stake position, open hoist engine, make on the frame and lift, PCC stake stake mould is pushed down into the ground certain depth in the effect of frame deadweight.Still less than projected depth, then open vibrating hammer as if the degree of depth that is pushed down in the deadweight effect, a mould is sunk under the effect of deadweight and vibration force simultaneously, stop up to reaching projected depth.If run into the pan soil interlayer in the immersed tube process, can adopt the lubricated stake pipe of heavy model slurry device pulping, reduce sidewall resistance, make a mould penetrate hard interbedded layer smoothly.General PCC stake stake mould need be punched weak soil layer 5, reaches character bearing stratum 4 preferably.Treat that a mould sinks to projected depth, remove vibration head, transfer reinforcing cage 2, at the bottom of reinforcing cage 2 lower ends are directly transferred to, and then vibration head is connected a mould top by the annular housing between the internal and external casing.Concrete perfusion, vibration pipe-drawing forms PCC stake 1.In order to guarantee pile quality, the job mix concrete slump is preferably 8cm～12cm, and as adopting commercial concrete, slump is preferably 8cm～12cm during non-pumping, and the slump is preferably 16cm～20cm during pumping.Carry out concrete curing.Must make the pile body concrete curing reach certain intensity and just can enter next step to guarantee construction safety.The back excavation stake core around the maintenance but long two week of the maintenance back excavation stake cores during less than 10m of general stake, stake are grown up when 10m.Carry out construction plant precipitation before the excavation stake core soil, infiltrate the stake core to prevent underground water.When bottom stake core soil 11 permeability own are lower, in the time of can playing good waterproof effect, can keep 1 ~ 1.5m stake core soil and not excavate, need not carry out precipitation.During elevation, precipitation does not directly excavate a core soil at the bottom of construction plant groundwater table elevation is lower than PCC stake stake.Stake core soil can adopt the manual type excavation, also can adopt high pressure water washing stake core soil to form mud after, extract a core soil with slush pump.All during excavation stake cores soil, the following 30 ~ 50cm of absolute altitude at the bottom of a stake core soil cutting depth should reach mainly is in order to guarantee that base plate 3 has certain thickness.When whole excavation stake cores are native, cut part stake base concrete, make stake hold the steel bar end that exposes 20 ~ 30cm, as connecting reinforcement 9.During part excavation stake core soil, punch at pile lining, expose the reinforcing cage 2 of PCC stake 1 inside with instruments such as electric impact drills.Transfer base plate reinforcing bar 7, and be connected (as shown in Figure 2) with stake end connecting reinforcement 9, more satisfactory method of attachment is exactly to the crooked nearly level of stake in-core portion with the connecting reinforcement 9 of reinforcing cage 2 ends, with pricking silk 8 reinforcing cage 2 and base plate reinforcing bar 7 are in the same place by connecting reinforcement 9 colligations then, the purpose of doing like this is to help bottom slab stress, perhaps is connected (as shown in Figure 4) with the reinforcing cage 2 that pile lining exposes.Concreting base plate 3 carries out back cover then.Base plate 3 build with maintenance processes in, if adopted well-points dewatering, then to continue precipitation and finish up to maintenance, with prevent base plate 3 concrete reach intensity before groundwater effect cause its cracking in base plate 3 bottoms.Make the pile crown cover plate at last,, then fill earthing 10, form the subsurface storage well at the cover plate end face if cover plate is a flush type.Subsurface storage well depth 10 ~ 30m that the present invention forms, interior diameter 1.5 ~ 4m, the storage well volume maximum of formation can reach 370m
3
Claims (6)
1. soft clay area PCC stake subsurface storage well preparation method comprises following technical step:
The first step: in place construction PCC stake;
Second step: PCC pile body concrete curing: make the pile body concrete curing reach the intensity of next step construction safety;
The 3rd step: at the bottom of construction plant groundwater table elevation is higher than PCC stake stake during elevation, and when higher, a circle well-points dewatering is set around storage well construction place near the stake core soil permeability at the stake end;
Elevation at the bottom of construction plant groundwater table elevation is higher than PCC stake stake, and when hanging down near the stake core soil permeability at the stake end, do not excavate at the bottom of the stake during excavation stake core soil, the end a 1 ~ 1.5m stops excavation in distance, the stake core soil layer of hypotonicity plays sealing function, prevents that underground water from entering tube chamber;
During elevation, directly excavation stake core soil is to the following 30 ~ 50cm of stake end absolute altitude at the bottom of construction plant groundwater table elevation is lower than PCC stake stake;
The 4th step: excavation stake core soil:
The 5th step: in the time of at the bottom of stake core soil excavates stake, cut part stake base concrete, make stake hold the steel bar end that exposes 20 ~ 30cm, as connecting reinforcement; In the time of at the bottom of stake core soil does not excavate stake, will store the bottom pile lining with instruments such as electric impact drills and punch the formation hole, expose the reinforcing bar of PCC stake pile body;
The 6th step: transfer the base plate reinforcing bar, and be connected, or be connected with PCC stake pile body reinforcing cage in the pile lining hole with stake end connecting reinforcement;
The 7th step: the concreting base plate carries out back cover, carries out the underplate concrete maintenance, and security intensity to be reached can stop precipitation;
The 8th step: make the pile crown cover plate: cover plate can adopt exposed according to requirement of engineering, directly exposes the face of land; Or the employing flush type, imbed underground certain depth, cover plate is installed back soil layer backfill, forms the subsurface storage well.
2. a kind of soft clay area PCC stake subsurface storage well preparation method according to claim 1 is characterized in that the pile sinking degree of depth 10 ~ 30m of PCC stake, interior diameter 1.5 ~ 4m, and the storage well volume of formation is 20 ~ 370m
3
3. a kind of soft clay area PCC stake subsurface storage well preparation method according to claim 1 is characterized in that cover plate fixedlys connected with pile crown or be movably connected.
4. a kind of soft clay area PCC stake subsurface storage well preparation method according to claim 1 is characterized in that cover plate steel cover plate or steel concrete cover plate.
5. a kind of soft clay area PCC stake subsurface storage well preparation method according to claim 1 is characterized in that storing well end face cover plate absolute altitude and is lower than ground, covers with soil on the cover plate, is convenient to insulation.
6. a kind of soft clay area PCC stake subsurface storage well preparation method according to claim 1 is characterized in that cover plate is provided with a hole, will store well by pipeline and be communicated to outside the well.
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| CN 201110165214 CN102296632B (en) | 2011-06-20 | 2011-06-20 | Manufacturing method of PCC (Cast-in-Place Concrete Large-Diameter Pipe Pile) underground storage well in soft soil region |
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| CN 201110165214 CN102296632B (en) | 2011-06-20 | 2011-06-20 | Manufacturing method of PCC (Cast-in-Place Concrete Large-Diameter Pipe Pile) underground storage well in soft soil region |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD301665A7 (en) * | 1985-10-15 | 1993-05-27 | Bauakademie Ddr | METHOD FOR CONSTRUCTING CIRCULAR FOAM |
| CN1367296A (en) * | 2002-01-14 | 2002-09-04 | 河海大学 | Soft foundation composite ground base construction method for field pouring pipe pile with large diameter |
| CN2515246Y (en) * | 2001-12-31 | 2002-10-09 | 河海大学 | Double pipe mould forming large diameter field pouring tubular pile machine used for soft ground |
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2011
- 2011-06-20 CN CN 201110165214 patent/CN102296632B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD301665A7 (en) * | 1985-10-15 | 1993-05-27 | Bauakademie Ddr | METHOD FOR CONSTRUCTING CIRCULAR FOAM |
| CN2515246Y (en) * | 2001-12-31 | 2002-10-09 | 河海大学 | Double pipe mould forming large diameter field pouring tubular pile machine used for soft ground |
| CN1367296A (en) * | 2002-01-14 | 2002-09-04 | 河海大学 | Soft foundation composite ground base construction method for field pouring pipe pile with large diameter |
Non-Patent Citations (1)
| Title |
|---|
| 肖明德: "适用于小城镇建设的扩底式灰土井桩", 《建筑技术开发》 * |
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