CN104196017A - Method for preventing lava zone hole punching/drilling cast-in-place pile mud leakage and hole collapse - Google Patents
Method for preventing lava zone hole punching/drilling cast-in-place pile mud leakage and hole collapse Download PDFInfo
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- CN104196017A CN104196017A CN201410403798.4A CN201410403798A CN104196017A CN 104196017 A CN104196017 A CN 104196017A CN 201410403798 A CN201410403798 A CN 201410403798A CN 104196017 A CN104196017 A CN 104196017A
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Abstract
The invention discloses a method for preventing lava zone hole punching/drilling cast-in-place pile mud leakage and hole collapse and relates to a construction technology with a soil-cement mixing column and a mud protecting wall combined. Leading drill information, the soil-cement mixing column and a hole punching/drilling cast-in-place pile are included. The method comprises the steps that a. according to the leading drill information, which columns need to use the soil-cement mixing column is judged first; b. the material using quantity of the soil-cement mixing column is designed; c. soil-cement mixing column construction is carried out; and d. after the soil-cement mixing column has certain intensity, hole punching/drilling cast-in-place pile construction is carried out. Accordingly, the difficulty of hole punching/drilling cast-in-place pile construction is lowered, time is saved, and construction efficiency is greatly improved.
Description
Technical field
The present invention relates to the method for preventing and treating of lava area punching/bored pile spillage, collapse hole, a kind of method of preventing and treating lava area punching/bored pile spillage, collapse hole is provided, be applicable to the regional punching/bored pile spillage of lava, region that collapse hole is serious.
Background technology
China's lava area is widely distributed, a lot of regional solution cavities are numerous, solution cavity be mainly by limestone (rock that calcium carbonate content is more) under the effect of water, acidic materials, microorganism etc. gradually by etch, form empty phenomenon, therefore there is the place of limestone substantially to have solution cavity.In lava area, carry out pile foundation construction is a difficult problem for puzzlement engineering circles always, especially single-column single pile, the situation that bearing capacity of single pile is larger, often produces spillage, collapse hole phenomenon, sometimes even produce large-area earth subsidence, jeopardize the safety of constructor and plant equipment.
Cement mixing method is a kind of common method of strengthening soft foundation, by spray into cement or cement paste in soil, makes cement, soil, water three produce complicated physics chemical action, finally forms the solid with some strength.Cement mixing method is widely used in fields such as ground stabilization, pattern foundation pit supporting structures, has advantages of cheap, easy construction.
The high level in lava area or heavy construction, the axle power of single post is all very large, and generally all over 5000KN, the optimal stake of engineering pile type is punching/bored pile.When construction punching/bored pile, spillage, collapse hole are universal phenomena.If cement mixing method is arranged in around engineering pile hole, both can play the effect in soldier pile hole, can make again hole soil around be frozen into cement-soil, strengthen the stability of self, certainly will be able to stop the generation of spillage, collapse hole.
Summary of the invention
The object of this invention is to provide a kind of spillage while solving construction punching/bored pile, the method for collapse hole problem, to reduce the difficulty of construction of punching/bored pile, accelerate the duration, save comprehensive cost.
Above-mentioned purpose of the present invention is achieved through the following technical solutions:
A method of preventing and treating lava area punching/bored pile spillage, collapse hole, comprises the following steps:
Step 1, according to following parts by weight configuration cement paste,
Raw material weight mark
373 kilograms of undisturbed soils
Cement 45-56 kilogram
Early strength admixture 0.45-0.56 kilogram
Water 22.5-25 kilogram
Step 2, dig mortar hole near on construction ground, according to the good cement paste of the proportional arrangement in step 1, Mixing Machine is in place, leveling;
Step 3, according to bearing capacity of single pile, calculate reinforcement depth, mixing pile machine drilling rod is stirred in advance and sinks down into reinforcement depth;
Step 4, the 1st limit water-spray type slurry, limit is stirred and to be promoted to the predetermined slurry face that stops, and wherein cement paste arrives mixer mouth spray from mortar hole through feed pipe for mortar by mortar pump, when cement grout arrives after mouth spray, should whitewash and stir 30 seconds-40 seconds; Again stir and sink down into the design reinforcement degree of depth;
Step 5, the 2nd limit water-spray type slurry, the predetermined slurry face that stops that is promoted to is stirred on limit;
Step 6, close Mixing Machine, stake machine is moved to next position, cement mixing method is circular array around in punching/bored pile hole, and along the mutual interlock of circumference.
In step 2 as above, configuring cement paste comprises the following steps:
Step 2.1, the cement paste configuration of selecting several different cement mixing contents, make test specimen;
After step 2.2,7-14 days, carry out test specimen to carry out without the restrict water supply compressive strength test of earth of side;
Step 2.3, choose and meet without the restrict water supply cement paste configuration of the minimum cement mixing content that the compressive strength of earth requires of side.
As abovely without side, restrict water supply and when the compressive strength of earth requires to be the 28 day length of time, reach 1.8Mpa.
In step 6 as above, the engineering time interval of adjacent studs is no more than 12 hours.
When cement mixing method as above adopts 500mm stake diameter, the center distance of two cement mixing methods is not more than 400mm; When cement mixing method adopts 600mm stake diameter, the center distance of two cement mixing methods is not more than 500mm; The beeline of cement mixing method inner edge and punching/bored pile outer rim is not less than 100mm.
The length of cement mixing method as above is not less than 10m, is no more than 20m.
The present invention compares with existing construction method, has the following advantages:
1, due to the cement mixing method of having constructed, the possibility of spillage, collapse hole is greatly reduced, greatly reduce the difficulty of construction of punching/bored pile;
2, avoid large area collapse hole, reduced the security risk of constructor and machinery;
3, reduce the actual duration of consuming.
Accompanying drawing explanation
Fig. 1 is pile layout plan view of the present invention;
Fig. 2 is pile layout sectional drawing of the present invention;
Fig. 3 is the geologic column of the embodiment of the present invention 1;
In figure: 1-punching/bored pile, 2-cement mixing method, the beeline of D1-cement mixing method inner edge and punching/bored pile outer rim; D2-punching/bored pile diameter; The diameter of D3-cement mixing method; The ultimate range of two cement mixing method interlocks of D4-.
The specific embodiment
Below in conjunction with example, technical scheme of the present invention is further described.
Embodiment 1:
A method of preventing and treating lava area punching/bored pile spillage, collapse hole, comprises the following steps:
The solution cavity of step 1, the selected cement mixing method of need to constructing.According to leading brill data preliminary judgement need to construct cement mixing method stake hole.All there is larger solution cavity in the stake position that easily causes spillage collapse hole, and solution cavity soil property is around poor, during punching/drilled pile construction, there are larger impact and vibration, when breaking through solution cavity, the solution cavity earth fall is around subside into solution cavity, and the soil body on top is not enough to keep the stable of stake hole, has just produced collapse hole or spillage phenomenon, the serious surface collapse that even causes, threatens constructor and mechanical safety.According to leading brill survey data, prospecting department can point out the size of solution cavity and distribute, and generally judges that solution cavity diameter surpasses 1 meter or collapse hole this hole cement mixing method of should constructing while boring in advance.
Step 2, design cement mixing method material usage, because cement mixing method only plays temporary lining effect, so it is not high to life requirement, than common cement mixing method, can mix early strength admixture, the effect of early strength admixture is to make cement-soil rapid solidification, to reach the object of accelerating construction progress; Early strength admixture can be bought in market (early strength admixture as efficient in tripartite confrontation board); Cement mixing method adopts the portland cement of 32.5Mpa or 42.5Mpa intensity, and what require the 28 day length of time is not less than without the restrict water supply compressive strength standard value of earth of side the compressive strength that 1.8Mpa(is roughly equivalent to 6 layers of solid brick masonry bottom).The volume of cement in soil, water/binder ratio early strong agent content need to be joined through examination, are below the scopes of volume.
Raw material weight mark is with reference to manufacturer
373 kilograms of undisturbed soils/
The new cement of cement 45-56 kilogram China
Early strength admixture 0.45-0.56 kilogram of Hunan pioneer's building materials Co., Ltd
Water 22.5-25 kilogram tap water
Examination timing water, cement, the weight ratio of early strength admixture can be constant, the volume of cement in undisturbed soil can be by 12.5%(weight ratio), 13.5%(weight ratio), 15%(weight ratio) dividing 3 groups tests, get 3 test specimens for every group, carry out after 7 days-14 days without the restrict water supply compressive strength test of earth of side, draw after result of the test, according to the clause explanation of < < building lot treatment technology standard > > 7.3.3 bar, the soil cement intensity in the 14 day length of time is equivalent to 0.62 ~ 0.80 times of 28 days age strengths, therefore in practical operation, can select the compressive strength standard value of 1.8Mpa can reach 1.44Mpa when the 14 day length of time.Employing can reach without side restricts water supply the minimum volume of compressive strength standard value 1.8Mpa of earth for formal construction.As 12.5%(weight ratio), 13.5%(weight ratio), 15%(weight ratio) all can meet the requirement of 1.8Mpa, get 12.5%(weight ratio).
Step 3, construction cement mixing method.1) dig mortar hole near on construction ground, the proportioning definite by step 2 configures cement paste; Mixing Machine is in place, leveling; 2) bearing capacity of single cement-soil mixed pile characteristic value just can play a gear effect between 100KN ~ 120KN, bearing capacity of single pile calculates by the formula 7.1.5-3 of < < building lot treatment technology standard > >, also need to check by formula 7.3.3, calculate reinforcement depth, mixing pile machine drilling rod is stirred in advance and sinks down into the design reinforcement degree of depth; 3) the 1st limit water-spray type slurry, limit is stirred and to be promoted to the predetermined slurry face that stops, and wherein cement paste arrives mixer mouth spray from mortar hole through feed pipe for mortar by mortar pump, when cement grout arrives after mouth spray, should whitewash and stir 30 seconds-40 seconds; 4) again stir and sink down into the design reinforcement degree of depth; 5) the 2nd limit water-spray type slurry, the predetermined slurry face that stops that is promoted to is stirred on limit; 6) close Mixing Machine, stake machine is moved to next position.7) due to the mutual interlock of cement mixing method, the engineering time interval of adjacent studs should not surpass 12 hours, otherwise can cause pile difficulty.
For certain punching/bored pile hole, the cement mixing method of first constructing, after cement mixing method reaches design strength (being the requirement of 28 days 1.8Mpa in step 2), the punching/bored pile of could constructing.
Cement mixing method is circular array around in punching/bored pile hole, and along the mutual interlock of circumference, when cement mixing method adopts 500mm stake diameter, the center distance of two cement mixing methods is not more than 400mm, when cement mixing method adopts 600mm stake diameter, the center distance of two cement mixing methods is not more than 500mm.Its main purpose is intercept underground water and prevent that the hole periphery silt from pouring in, and improves engineering pile quality.
The beeline of cement mixing method inner edge and punching/bored pile outer rim is not less than 100mm, to facilitate the construction of punching/bored pile.
Due to the restriction of piling machinery, the length of cement mixing method is not less than 10m, is no more than 20m, otherwise difficult quality guarantee.
After above scheme implementation, when punching/bored pile construction is during to solution cavity, there will not be silt to pour in solution cavity and cause collapse hole, personnel and mechanical safety guarantee are improved greatly.
Embodiment 2:
A method of preventing and treating lava area punching/bored pile spillage, collapse hole, comprises the following steps:
The solution cavity of step 1, the selected cement mixing method of need to constructing.According to leading brill data preliminary judgement need to construct cement mixing method stake hole.As shown in Figure 3, in leading brill log sheet, in the scope of 25.20 ~ 30.20m, there is the solution cavity that 5m is high, the cement mixing method so need to construct in this hole, stake hole numbering and the position of the cement mixing method of need to constructing are recorded and make a mark at the scene.
Step 2, design cement mixing method material usage.Cement mixing method adopts the Portland cement of 42.5Mpa intensity, require the 28 day length of time without side restrict water supply the compressive strength standard value of earth be not less than 1.8Mpa, water/binder ratio early strong agent content need to join through examination.
The weight ratio of examination timing cement, early strength admixture, water is fixed as 1:0.01:0.5, the volume of cement in undisturbed soil can be by 12.5%(weight ratio), 13.5%(weight ratio), 15%(weight ratio) dividing 3 groups tests, get 3 test specimens for every group, carry out after 14 days without the restrict water supply compressive strength test of earth of side.13.5%(weight ratio in the present embodiment), 15%(weight ratio) all can meet the requirement of 1.8Mpa, therefore get cement mixing content, be 13.5%(weight ratio).
Step 3, construction cement mixing method.1) dig mortar hole near on construction ground, the proportioning definite by step 2 configures cement paste; Mixing Machine is in place, leveling; 2) bearing capacity of single cement-soil mixed pile characteristic value is calculated by the formula 7.1.5-3 of < < building lot treatment technology standard > >, the bearing capacity of single pile that calculates the present embodiment is 110KN, its reinforcement depth is 12 meters, and mixing pile machine drilling rod is stirred in advance and sinks down into 12 meters of the design reinforcement degree of depth; 3) the 1st limit water-spray type slurry, limit is stirred and to be promoted to the predetermined slurry face that stops, and wherein cement paste arrives mixer mouth spray from mortar hole through feed pipe for mortar by mortar pump, when cement grout arrives after mouth spray, should whitewash and stir 30 seconds; 4) again stir and sink down into the design reinforcement degree of depth; 5) the 2nd limit water-spray type slurry, the predetermined slurry face that stops that is promoted to is stirred on limit; 6) close Mixing Machine, stake machine is moved to next position.7) due to the mutual interlock of cement mixing method, the engineering time interval of adjacent studs should not surpass 12 hours, otherwise can cause pile difficulty.
For certain punching/bored pile hole, the cement mixing method of first constructing, after cement mixing method reaches design strength, the Punching Borehole Cast-in-place Concrete Pile of could constructing.The present embodiment detected soil cement intensity after 14 days, met the demands, follow-up just construction Punching Borehole Cast-in-place Concrete Pile.
Cement mixing method is circular array around in Punching Borehole Cast-in-place Concrete Pile hole, and along the mutual interlock of circumference, the present embodiment adopts 500mm stake diameter, the center distance 400mm of two cement mixing methods, middle coincidence 100, has effectively prevented that stake hole periphery silt from pouring in, and guaranteed engineering pile quality.
In the present embodiment, the beeline of cement mixing method inner edge and punching/bored pile outer rim is 150mm, to facilitate the construction of Punching Borehole Cast-in-place Concrete Pile.
After above scheme implementation, when concrete pouring of punched hole piles arrives solution cavity, there is not collapse hole phenomenon, greatly improved constructor and mechanical level of security.
Claims (6)
1. a method of preventing and treating lava area punching/bored pile spillage, collapse hole, is characterized in that, comprises the following steps:
Step 1, according to following parts by weight configuration cement paste,
Raw material weight mark
373 kilograms of undisturbed soils
Cement 45-56 kilogram
Early strength admixture 0.45-0.56 kilogram
Water 22.5-25 kilogram
Step 2, dig mortar hole near on construction ground, according to the good cement paste of the proportional arrangement in step 1, Mixing Machine is in place, leveling;
Step 3, according to bearing capacity of single pile, calculate reinforcement depth, mixing pile machine drilling rod is stirred in advance and sinks down into reinforcement depth;
Step 4, the 1st limit water-spray type slurry, limit is stirred and to be promoted to the predetermined slurry face that stops, and wherein cement paste arrives mixer mouth spray from mortar hole through feed pipe for mortar by mortar pump, when cement grout arrives after mouth spray, should whitewash and stir 30 seconds-40 seconds; Again stir and sink down into the design reinforcement degree of depth;
Step 5, the 2nd limit water-spray type slurry, the predetermined slurry face that stops that is promoted to is stirred on limit;
Step 6, close Mixing Machine, stake machine is moved to next position, cement mixing method is circular array around in punching/bored pile hole, and along the mutual interlock of circumference.
2. a kind of method of preventing and treating lava area punching/bored pile spillage, collapse hole according to claim 1, is characterized in that, configures cement paste and comprise the following steps in described step 2:
Step 2.1, the cement paste configuration of selecting several different cement mixing contents, make test specimen;
After step 2.2,7-14 days, carry out test specimen to carry out without the restrict water supply compressive strength test of earth of side;
Step 2.3, choose and meet without the restrict water supply cement paste configuration of the minimum cement mixing content that the compressive strength of earth requires of side.
3. a kind of method of preventing and treating lava area punching/bored pile spillage, collapse hole according to claim 2, is characterized in that, described without side, restrict water supply and when the compressive strength requirement of earth is the 28 day length of time, reaches 1.8Mpa.
4. a kind of method of preventing and treating lava area punching/bored pile spillage, collapse hole according to claim 3, is characterized in that, in described step 6, the engineering time interval of adjacent studs is no more than 12 hours.
5. a kind of method of preventing and treating lava area punching/bored pile spillage, collapse hole according to claim 4, is characterized in that, when described cement mixing method adopts 500mm stake diameter, the center distance of two cement mixing methods is not more than 400mm; When cement mixing method adopts 600mm stake diameter, the center distance of two cement mixing methods is not more than 500mm; The beeline of cement mixing method inner edge and punching/bored pile outer rim is not less than 100mm.
6. a kind of method of preventing and treating lava area punching/bored pile spillage, collapse hole according to claim 5, is characterized in that, the length of described cement mixing method is not less than 10m, is no more than 20m.
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| CN111485549A (en) * | 2020-04-30 | 2020-08-04 | 广西路建工程集团有限公司 | Rotary drilling and buried drilling treatment method |
| CN112609690A (en) * | 2020-12-09 | 2021-04-06 | 中铁二十局集团第六工程有限公司 | Construction method of rotary drilling cast-in-place pile in sea-filling geological complex area |
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| CN108301403A (en) * | 2018-01-04 | 2018-07-20 | 中国建筑第八工程局有限公司 | Subway drilling cast-in-place pile construction method |
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| CN112609690A (en) * | 2020-12-09 | 2021-04-06 | 中铁二十局集团第六工程有限公司 | Construction method of rotary drilling cast-in-place pile in sea-filling geological complex area |
| CN113322936A (en) * | 2021-06-25 | 2021-08-31 | 中建三局第三建设工程有限责任公司 | Soil body reinforcing construction method and construction auxiliary device for thick sand layer karst area |
| CN113322936B (en) * | 2021-06-25 | 2022-06-14 | 中建三局第三建设工程有限责任公司 | Soil body reinforcing construction method and construction auxiliary device for thick sand layer karst area |
| CN114351774A (en) * | 2021-12-31 | 2022-04-15 | 安徽省交通规划设计研究总院股份有限公司 | Method for predicting and processing collapsed hole of cast-in-place pile |
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