CN101550693B - Method for reinforcing base with bored pile in the underground structure of high groundwater level - Google Patents

Method for reinforcing base with bored pile in the underground structure of high groundwater level Download PDF

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Publication number
CN101550693B
CN101550693B CN2009103021282A CN200910302128A CN101550693B CN 101550693 B CN101550693 B CN 101550693B CN 2009103021282 A CN2009103021282 A CN 2009103021282A CN 200910302128 A CN200910302128 A CN 200910302128A CN 101550693 B CN101550693 B CN 101550693B
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base plate
hole
steel bushing
place
grouting
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CN101550693A (en
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冯旭
郭志强
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China Civil Engineering Construction Corp
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China Civil Engineering Construction Corp
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Abstract

A method for reinforcing base with bored pile in the underground structure of high groundwater level, the steps of which is as following: 1) removing the concrete on the surface of pile at the structural flask board, 2) drilling grouting borehole along the external circumstance of the aforementioned concrete and inserting the grout pipe into to the strata under the structural flask board, 3) water-stop grouting the strata under the structural flask board to the place of structural flask board, 4) drilling holes, 5) removing the concrete blocks at the hole site, 6) installing water-stop steel sleeve barrel, 7) installing permanent steel casing, and carrying out pile construction. This construction method efficaciously prevents the ground water flowing when the drilling pile passing the underground structural flask board, and accounts for the technical problem that the construction can not be carried out with emission of the ground water flood when the drilling pile penetrating through the underground structure flask board reinforcement base at the high groundwater level place.

Description

Use the job practices of drilled pile underpinning in the existing underground structure of phreatic high
Technical field
The present invention relates to a kind of reinforced construction method of building foundation, the job practices that particularly a kind of groundwater level region is reinforced the basis.
Background technology
Be higher than existing underground structure base plate in groundwater table, need penetrate the underground structure base plate and beat drilled pile, under the situation that the basis is reinforced, usually it is no longer suitable that the job practices that permanent steel casing creeps into is again beaten by used elder generation, because as long as underground structure base plate one is destroyed, underground water will be poured into underground structure along the space between permanent steel casing and the base plate, not only influences works in the normal use of construction period, and can cause difficulty to construction.
Summary of the invention
The invention provides the job practices of using the drilled pile underpinning in the existing underground structure of a kind of phreatic high, solve when groundwater level region penetrates underground structure jacking of floor basis with drilled pile the technical problem that underground water is gushed out and can't be constructed.
The technical solution adopted for the present invention to solve the technical problems is:
With the job practices of drilled pile underpinning, it is characterized in that construction sequence is as follows in the existing underground structure of this phreatic high:
Step 1 cuts the top layer concrete that the structure base plate is positioned at place, stake position, cuts the diameter of concrete circle diameter greater than the sealing steel bushing that will penetrate, and the top reinforcement of structure base plate is cut off, and forms a job platform;
Step 2 is installed grout pipe, cuts concrete periphery and bores grout hole along above-mentioned, penetrates grout pipe, and pipe is deep in the stratum of structure floor below;
Step 3, sealing grouting is in the milk to the stratum of structure floor below, and stratum grouting part is carried out shutoff to structure base plate place to the hole in the stratum;
Step 4, put circumference and bore aperture along circumference on the described job platform of step 1, the diameter of unwrapping wire is greater than the permanent steel casing diameter that will penetrate, and less than the diameter of sealing steel bushing, along circumference the structure base plate is drilled, stay the concrete block at place, position, hole;
Step 5 removes the concrete block that the position, hole is located, and makes the hole that can penetrate permanent steel casing;
Step 6 is installed the sealing steel bushing on job platform, after the lifting sealing steel bushing and structure base plate are fixed.
Step 7 is installed permanent steel casing, water filling in advance in the sealing steel bushing, and balance drills the groundwater pressure of gushing out behind the structure base plate, with boring stake machinery permanent steel casing is penetrated in the stratum in the sealing steel bushing, carries out the drilled pile construction operation.
The quantity of grout hole is 2-4 in the described step 2.
Sealing grouting in the described step 3 can be carried out in two steps, be in the milk to the structure base plate earlier with the grouting material, to the structure floor below carry out shutoff than macroscopic void, in grouting is expected, add water glass then, continue grouting, less space in the plugging structure floor below boring scope.
Grouting material in the described step 3 can be cement paste and white clay mixture.
In the described step 4, hole continuously to structure base plate bottom surface along circumference, stay the concrete block at place, position, hole with concrete drilling machine.
In the described step 5, at the concrete block top at place, position, hole suspension hook is installed, and the concrete block at place, position, hole is hung the structure base plate, suspension hook is fixed with the concrete block at setscrew and iron plate and place, position, hole.
Sealing steel bushing bottom in the described step 6 has installed waterstop, at sealing steel bushing outer wall place's weldable steel support and concreting, sealing steel bushing and structure base plate is fixed, and irritates non-shrinkage mud around the sealing steel bushing bottom and makes waterproof sealing.
The present invention at the place, stake position of underground structure backplate surface, cuts the top layer concrete of the interior certain depth of sealing steel bushing scope hereinafter described earlier, cuts off the base plate reinforcing bar; Bore grout hole, grout pipe is installed, to the following soil layer grouting of base plate, can make the following impervious layer that forms in the certain limit of base plate by grout pipe; Remove the concrete block at the permanent steel casing of drilled pile position range endoporus position place then, thus the time form impervious layer under the base plate by grouting, so underground water can not pour in fast from this base plate hole; At place, stake position the sealing steel bushing of diameter greater than permanent steel casing diameter is installed again, carried out the waterproof of sealing steel bushing bottom, like this, the underground water that pours in just is limited in the sealing steel bushing.Water filling in advance in the sealing steel bushing drills groundwater pressure behind the soil layer of grouting below the base plate with balance; At last, just can carry out bore operation with boring the permanent steel casing of stake machinery drive.
Beneficial effect of the present invention is as follows: this job practices does not influence the normal use of underground structure in construction period, simple to operate, with low cost, when having stoped drilled pile effectively by the underground structure base plate, phreatic pouring in, solved when groundwater level region penetrates underground structure jacking of floor basis with drilled pile the technical problem that underground water is gushed out and can't be constructed.Be higher than in groundwater table under the situation of existing underground structure base plate, this job practices neither influences the use of underground structure, can not damage underground structure again, can be widely used in the strengthening construction of existing underground building structures such as storehouse, groundwater level region ground.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the schematic diagram of construction sequence 1.
Fig. 2 is the schematic diagram of construction sequence 2,3.
Fig. 3 is the schematic diagram of construction sequence 4,5.
Fig. 4 is the structural representation of A A section among Fig. 3.
Fig. 5 is the schematic diagram of construction sequence 6.
Fig. 6 is the schematic diagram of construction sequence 7.
Reference numeral: 1-structure base plate, 2-stratum, 3-cut concrete block, 11-suspension hook, 12-waterstop, the 13-non-shrinkage mud at concrete, 4-top reinforcement, 5-grout hole, 6-stratum grouting part, the permanent steel casing of 7-, 8-sealing steel bushing, 9-aperture, place, position, 10-hole.
The specific embodiment
Embodiment is referring to Fig. 1-shown in Figure 6, and job practices of the present invention can have the following steps:
Referring to shown in Figure 1, step 1, cut structure base plate 1 and be positioned at the top layer concrete that diameter 1200mm scope is located in the stake position, the thickness that cuts concrete 3 can be 200mm, expose the base plate top reinforcement, cut the diameter of the circle diameter of concrete 3, and the top reinforcement 4 of structure base plate is cut off, form a job platform greater than the sealing steel bushing 8 that will penetrate.
Referring to shown in Figure 2, step 2 is installed grout pipe, bores 3 grout holes 5 that are 120 ° of distributions along the above-mentioned periphery that cuts concrete 3, penetrates grout pipe, and pipe is deep in the stratum 2 of the about 1m of structure floor below; The outer circumference diameter that cuts concrete 3 can be 1200mm, and the diameter of grout hole 5 is 75mm, and the diameter of grout pipe is 38mm.
Referring to shown in Figure 2, step 3, sealing grouting is in the milk to the stratum of structure floor below, and stratum grouting part 6 is carried out shutoff to structure base plate place to the hole in the stratum.Elder generation cement grouting and white clay mixture in 3 grout pipes, interior in a big way big hole under the structure base plate is carried out shutoff, in cement paste and white clay mixture, add water glass then, continue grouting by 3 grout pipes, little space in the boring scope under the plugging structure base plate is to guarantee the leakproofness of shutoff in the boring scope.Mud jacking intensity can be 15bar.
Referring to Fig. 3, shown in Figure 4, step 4, at the circumference of putting Φ 700mm on the described job platform of step 1 and the aperture 9 that bores 24 Φ 100mm along circumference at the bottom of the take-through plate.The diameter of unwrapping wire is greater than permanent steel casing 7 diameters that will penetrate, and less than the diameter of sealing steel bushing 8, along circumference the structure base plate drilled, and stays the concrete block 10 at place, position, hole.
Referring to Fig. 3, shown in Figure 4, step 5 removes the concrete block 10 that the position, hole is located, and makes the hole that can penetrate permanent steel casing 7; In the concrete slab of Φ 700mm, suspension hook is installed, is fixed with setscrew and iron plate.The concrete block of with loop wheel machine the position, hole being located on operation platform 10 hangs the structure base plate.
Referring to shown in Figure 5, step 6, the sealing steel bushing 8 of diameter of phi 1000 is installed on job platform, installed the Φ 1000mm sealing steel bushing of waterstop to the surface that removes the thick concrete of 200mm zone from operation platform lifting bottom, punch place and Φ 1000mm sealing steel bushing gap welded reinforcement support and concreting with fixing sealing steel bushing at the upper strata floor, irritate non-shrinkage mud all around at sealing steel bushing lowermost end then.Sealing steel bushing 8 is fixing with structure base plate 1.
Referring to shown in Figure 6, step 7, the permanent steel casing 7 of diameter of phi 610mm is installed, water filling in advance in sealing steel bushing 8, balance drills the groundwater pressure of gushing out behind the structure base plate, finish the sealing operation after, in sealing steel bushing 8, penetrate permanent steel casing 7 in the stratum 2 with boring stake machinery, carry out the drilled pile construction operation, the drilled pile construction operation is identical with existing operation.

Claims (7)

  1. In the existing underground structure of phreatic high with the job practices of drilled pile underpinning, it is characterized in that construction sequence is as follows:
    Step 1 cuts the top layer concrete that structure base plate (1) is positioned at place, stake position, cuts the diameter of the circle diameter of concrete (3) greater than the sealing steel bushing (8) that will penetrate, and the top reinforcement (4) of structure base plate is cut off, and forms a job platform;
    Step 2 is installed grout pipe, bores grout hole (5) along the above-mentioned periphery that cuts concrete (3), penetrates grout pipe, and pipe is deep in the stratum (2) of structure floor below;
    Step 3, sealing grouting is in the milk to the stratum of structure floor below, and stratum grouting part (6) is carried out shutoff to structure base plate place to the hole in the stratum;
    Step 4, on the described job platform of step 1, put circumference and bore aperture (9) along circumference, the diameter of unwrapping wire is greater than permanent steel casing (7) diameter that will penetrate, and less than the diameter of sealing steel bushing (8), along circumference the structure base plate is drilled, stay the concrete block (10) at place, position, hole;
    Step 5 removes the concrete block (10) that the position, hole is located, and makes the hole that can penetrate permanent steel casing (7);
    Step 6 is installed sealing steel bushing (8) on job platform, after the lifting that sealing steel bushing (8) and structure base plate (1) is fixing;
    Step 7, permanent steel casing (7) is installed, water filling in advance in the sealing steel bushing, balance drills the groundwater pressure of gushing out behind the structure base plate, with boring stake machinery permanent steel casing (7) is penetrated in the stratum (2) in sealing steel bushing (8), carry out the drilled pile construction operation.
  2. 2. with the job practices of drilled pile underpinning, it is characterized in that in the existing underground structure of phreatic high according to claim 1: the quantity of grout hole in the described step 2 (5) is 2-4.
  3. 3. use the job practices of drilled pile underpinning in the existing underground structure of phreatic high according to claim 1, it is characterized in that: the sealing grouting in the described step 3 is carried out in two steps, be in the milk to the structure base plate with the grouting material earlier, the structure floor below carried out shutoff than macroscopic void, in the grouting material, add water glass then, continue grouting, less space in the plugging structure floor below boring scope.
  4. 4. with the job practices of drilled pile underpinning, it is characterized in that: the grouting material in the described step 3 is cement paste and white clay mixture in the existing underground structure of phreatic high according to claim 3.
  5. 5. use the job practices of drilled pile underpinning in the existing underground structure of phreatic high according to claim 1, it is characterized in that: in the described step 4, bore aperture (9) continuously to structure base plate bottom surface with concrete drilling machine along circumference, stay the concrete block (10) at place, position, hole.
  6. 6. use the job practices of drilled pile underpinning in the existing underground structure of phreatic high according to claim 1, it is characterized in that: in the described step 5, suspension hook (11) is installed at concrete block top at place, position, hole, and the concrete block at position, hole place hung the structure base plate, suspension hook (11) is fixed with the concrete block (10) at place, position, hole with setscrew and iron plate.
  7. 7. use the job practices of drilled pile underpinning in the existing underground structure of phreatic high according to claim 1, it is characterized in that: sealing steel bushing (8) bottom in the described step 6 has installed waterstop (12), at sealing steel bushing outer wall place's weldable steel support and concreting, make sealing steel bushing (8) and structure base plate (1) fixing, irritate non-shrinkage mud (13) around the sealing steel bushing bottom and make waterproof sealing.
CN2009103021282A 2009-05-06 2009-05-06 Method for reinforcing base with bored pile in the underground structure of high groundwater level Active CN101550693B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN101550693B true CN101550693B (en) 2010-12-08

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101787718B (en) * 2010-02-10 2011-08-17 上海智平基础工程有限公司 Casing construction method for reinforcing underground building and structure foundation
CN106245625A (en) * 2016-07-28 2016-12-21 中国建筑第六工程局有限公司 Pass through the bored pile construction method of existing Large Underground space structure
CN106284435B (en) * 2016-09-06 2018-03-13 中铁二十四局集团南昌铁路工程有限公司 A kind of method for preventing Metro station excavation bedding CS central stand column pile from floating
CN108755779B (en) * 2018-05-04 2020-06-05 中科院广州化灌工程有限公司 Pile pressing and water stopping construction process of pressure-bearing basement anchor rod static pressure pile
CN111719554A (en) * 2020-03-21 2020-09-29 东莞市大乘建筑工程技术有限公司 Static pressure anchor rod pile foundation reinforcing structure and construction process thereof

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