CN111997042A - Construction method of water-stop curtain between plastic concrete piles - Google Patents
Construction method of water-stop curtain between plastic concrete piles Download PDFInfo
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- CN111997042A CN111997042A CN202010761605.8A CN202010761605A CN111997042A CN 111997042 A CN111997042 A CN 111997042A CN 202010761605 A CN202010761605 A CN 202010761605A CN 111997042 A CN111997042 A CN 111997042A
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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
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
-
- 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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a construction method of a waterproof curtain between plastic concrete piles. The construction method comprises the following steps: 1) leveling the field, measuring and setting out, and determining the pile position of the support pile; 2) a drilling machine is in place, and is drilled to form a hole, and the soil is cleared in an idle running mode after the designed depth is reached; 3) pouring plastic concrete to form a column; 4) sealing and protecting the pile top, and moving the drilling machine to the next pile position for construction; wherein, the plastic concrete is stirred on site, and the components of the plastic concrete comprise clay and/or bentonite. The construction method has the advantages of good seepage-proofing effect, low construction cost and the like.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a construction method of a waterproof curtain between plastic concrete piles.
Background
With the increase of the utilization of underground space, the underground buildings of cities are gradually deepened, which brings certain difficulty to foundation pit supporting. Although the theory and construction of the retaining and supporting structure are mature at present, the most important is the foundation pit water stopping form. The traditional water stopping forms are mostly cement piles, water stopping materials are mostly cement, concrete and the like, and the construction is complex and the cost is high.
Disclosure of Invention
The invention aims to provide a construction method of a waterproof curtain among plastic concrete piles, which has the advantages of good seepage-proofing effect, low construction cost and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a construction method of a waterproof curtain among plastic concrete piles comprises the following steps:
1) leveling the field, measuring and setting out, and determining the pile position of the support pile;
2) a drilling machine is in place, and is drilled to form a hole, and the soil is cleared in an idle running mode after the designed depth is reached;
3) pouring plastic concrete to form a column;
4) sealing and protecting the pile top, and moving the drilling machine to the next pile position for construction;
wherein, the plastic concrete is stirred on site, and the components of the plastic concrete comprise clay and/or bentonite.
In the above technical scheme:
the components of the plastic concrete generally contain cement, sand, stone, clay or bentonite, and the proportion of the components needs to be adjusted according to the actual condition of the material, the field environment and the engineering requirements. The application provides a preferable example, namely the plastic concrete comprises the following components in parts by weight: 90-150 parts of cement, 400-600 parts of medium coarse sand, 500-650 parts of broken stone and/or pebble, 90-150 parts of clay and/or bentonite and 20-50 parts of fly ash.
Wherein the cement is composite portland cement with the strength grade of 32.5; the mud content of the medium coarse sand is less than or equal to 3 wt%, and the mud block content is less than or equal to 1 wt%; the particle size of the broken stone or pebble is 5-40 mm, the content of needle and sheet particles is less than or equal to 10 wt%, the content of mud is less than or equal to 1 wt%, and the content of mud blocks is less than or equal to 0.5 wt%.
The charging sequence of the plastic concrete during on-site stirring is as follows: (1) macadam and/or pebble → (2) cement → (3) medium coarse sand → (4) clay and/or bentonite, and fly ash → (5) water. Wherein the water-cement ratio is 0.4-0.6.
The process of pouring the plastic concrete comprises the following steps:
pre-lifting the drill rod for 0.2-0.3 m before pouring, then pouring plastic concrete and lifting the drill rod at the same time, wherein the concrete conveying speed is 50-70 m3And h, lifting the drill bit after the drill bit is empty for 5-10 s, and ensuring that the drill bit is 0.1m in the central tube in the lifting process of the drill rod3And (3) after the plastic concrete is poured to the designed elevation, continuously conveying the concrete for 8-20 s, and stopping pouring after 500mm of over-pouring is ensured so as to ensure the quality of the pile head.
When the field is leveled, the ground slope of the construction field is ensured to be less than 1%.
The process of measuring the pay-off line comprises the following steps:
1) after the axis angular points of the building are retested without errors, permanent identification is made and embedded;
2) measuring out each axis by using an axis angular point and a corner point to form an axis control network, and making an axis pile;
3) measuring and placing each pile position by using a coordinate and axis control net;
4) and (4) introducing elevation points, burying permanent elevation points after the field is inspected to be qualified, and marking and protecting.
The invention has the beneficial effects that:
1) the invention relates to a novel waterproof curtain construction process which is formed by replacing partial cement and coarse aggregate in common concrete with clay and bentonite on the basis of pore-forming cast-in-place pile construction. Because the limit strain of the plastic concrete under the unconfined condition is more than 1 percent, is several times or even dozens of times larger than that of the common concrete, and can have a stress-strain curve which is very similar to that of a peripheral soil layer, when the plastic concrete is applied to water stopping of a foundation pit, even if the periphery of the foundation pit deforms a little, the plastic concrete can generate similar stress strain with the peripheral soil layer, and a pile body actually bears a little load, so that the plastic concrete pile is used as a water stopping curtain, and the phenomenon that the water stopping curtain is damaged due to the deformation of the foundation pit can be well overcome.
2) The plastic concrete has lower permeability coefficient (generally n is multiplied by 10)－7～n×10－9cm/s), and the clay and bentonite in the plastic concrete have certain diffusion effect, even if slight deformation cracks occur in the process that the plastic concrete and the surrounding soil layer are simultaneously strained, the clay in the water-stopping curtain can heal the fine cracks, the water-stopping effect is improved, and the construction requirements of seepage prevention and water stopping of various scales can be met;
3) the invention adopts the pile jumping construction, and when the early strength of the pile body plastic concrete reaches the design requirement, the hole forming construction of the secant pile can be carried out; therefore, the mixing proportion of the plastic concrete can be adjusted according to the construction sequence and the arrangement of the construction period, the early strength of the plastic concrete is controlled, and the purpose of saving the construction period is achieved
Drawings
FIG. 1 is a block flow diagram of a preferred embodiment of the present invention.
Detailed Description
The present invention will now be described with reference to the accompanying drawings, wherein the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
Referring to fig. 1, the method for constructing the waterproof curtain between the plastic concrete piles according to the embodiment includes the following steps:
1. preparation for construction
Before construction, the ground is laid, leveled and rolled by a bulldozer according to the ground level, so that the foundation has enough bearing capacity, the driving requirement of the pile driver is met, and the ground gradient is less than 1%.
2. Measuring line
2.1, after the axis angular points of the building are retested without errors, permanent identification is made and embedded;
2.2 measuring each axis by using the axis angular points and the corner points to form an axis control network and making an axis pile;
2.3, measuring and placing the pile position of each supporting pile by using the coordinate and axis control net;
2.4, introducing elevation points, burying permanent elevation points after the site is checked to be qualified, and marking and protecting.
3. Drill in place
Firstly, flattening and compacting the field are well done, so that the left support plate and the right support plate of the main machine are positioned on the same horizontal plane, the construction direction of the power head is parallel to the direction of the support plates, the power head can not be perpendicular to the support plates, and the front, back, left and right levels of the machine body are well adjusted before drilling. The drilling machine is positioned by using a self-walking moving system, and the alignment error of a drill bit and a pile position is less than 2 mm.
4. Forming and cleaning holes
The pressure irrigation drilling machine is in place and kept flat and stable, and a scale is arranged on the rack or the drill rod so as to control and record the hole depth. And (3) putting a drill rod down to enable the drill bit to be aligned with the pile site, adjusting the verticality of the drill rod, starting a drilling machine to drill, idle-running and clearing soil after the designed depth is reached, and not lifting the drill before pouring.
5. In-situ mixing of plastic concrete
5.1 the plastic concrete comprises the following components in parts by weight: 120 parts of cement, 560 parts of medium coarse sand, 600 parts of broken stone, 120 parts of clay and 30 parts of fly ash. Wherein the cement is composite portland cement with the strength grade of 32.5; the mud content of the medium coarse sand is less than or equal to 3 wt%, and the mud block content is less than or equal to 1 wt%; the particle size of the broken stone is 5-40 mm, the content of needle and sheet particles is less than or equal to 10 wt%, the content of mud is less than or equal to 1 wt%, and the content of mud blocks is less than or equal to 0.5 wt%.
5.2 the charging sequence when the plastic concrete is stirred is as follows: (1) macadam → (2) cement → (3) medium coarse sand → (4) clay and fly ash → (5) water. Wherein the water-cement ratio is 0.5.
6. Pouring plastic concrete
Pre-lifting the drill rod for 0.2-0.3 m before pouring, then pouring plastic concrete and lifting the drill rod at the same time, wherein the concrete conveying speed is 60m3And h, lifting the drill bit after the drill bit is empty for 5-10 s, and ensuring that the drill bit is 0.1m in the central tube in the lifting process of the drill rod3And (3) after the plastic concrete is poured to the designed elevation, continuously conveying the concrete for 8-20 s, and stopping pouring after 500mm of over-pouring is ensured.
7. Drill shifting
Cleaning the hole opening, and sealing and protecting the pile top. And putting down a pile position according to the construction sequence, and moving the pile machine to construct the next pile.
Benefit analysis of the present embodiment
1. Social benefits
1.1, adopting plastic concrete construction, being applicable to different stratums, directly forming holes and pouring, avoiding the delay of construction period caused by the problems of hole forming, hole collapse and the like;
1.2 compared with the traditional concrete cast-in-place pile, the super-fluid plastic concrete cast-in-place construction is adopted, the construction is simple and convenient, and the pile forming quality can be ensured;
1.3, in the construction process, the early strength of the plastic concrete can be controlled by adjusting the mixing proportion of the plastic concrete, so that the effects of optimizing the hole forming construction sequence and preventing the hole forming of the secant pile from deflecting are achieved, the construction period can be reasonably arranged, and the hole forming quality can be ensured;
1.4 the plastic concrete has less cement content, the pile body material is similar to the soil body, and the environmental pollution of the soil layer is reduced.
2. Economic benefits
2.1 because the plastic concrete has low deformation modulus and large ultimate strain, and the clay is added, the cement consumption is greatly reduced, and the cost is saved;
2.2 part of materials in the plastic concrete can be obtained from local resources (clay/drilling slag is recycled), and part of material cost is saved.
Claims (7)
1. The construction method of the waterproof curtain among the plastic concrete piles is characterized by comprising the following steps:
1) leveling the field, measuring and setting out, and determining the pile position of the support pile;
2) a drilling machine is in place, and is drilled to form a hole, and the soil is cleared in an idle running mode after the designed depth is reached;
3) pouring plastic concrete to form a column;
4) sealing and protecting the pile top, and moving the drilling machine to the next pile position for construction;
wherein, the plastic concrete is stirred on site, and the components of the plastic concrete comprise clay and/or bentonite.
2. The plastic concrete inter-pile waterproof curtain construction method as claimed in claim 1, wherein the plastic concrete comprises the following components in parts by weight:
90-150 parts of cement, 400-600 parts of medium coarse sand, 500-650 parts of broken stone and/or pebble, 90-150 parts of clay and/or bentonite and 20-50 parts of fly ash.
3. The plastic concrete inter-pile waterproof curtain construction method as claimed in claim 2, wherein:
the cement is composite portland cement with the strength grade of 32.5;
the mud content of the medium coarse sand is less than or equal to 3 wt%, and the mud block content is less than or equal to 1 wt%;
the particle size of the broken stone or pebble is 5-40 mm, the content of needle and sheet particles is less than or equal to 10 wt%, the content of mud is less than or equal to 1 wt%, and the content of mud blocks is less than or equal to 0.5 wt%.
4. The plastic concrete inter-pile waterproof curtain construction method as claimed in claim 2 or 3, wherein the charging sequence of the plastic concrete during on-site stirring is as follows:
(1) crushed stones and/or pebbles; (2) cement; (3) medium coarse sand; (4) clay and/or bentonite, and fly ash; (5) water; wherein the water-cement ratio is 0.4-0.6.
5. The construction method of the waterproof curtain between the plastic concrete piles as claimed in claim 1, wherein the process of pouring the plastic concrete is as follows:
pre-lifting the drill rod for 0.2-0.3 m before pouring, then pouring plastic concrete and lifting the drill rod at the same time, wherein the concrete conveying speed is 50-70 m3And h, lifting the drill bit after the drill bit is empty for 5-10 s, and ensuring that the drill bit is 0.1m in the central tube in the lifting process of the drill rod3And (3) after the plastic concrete is poured to the designed elevation, continuously conveying the concrete for 8-20 s, and stopping pouring after 500mm of over-pouring is ensured.
6. The plastic concrete inter-pile waterproof curtain construction method as claimed in claim 1, wherein: when the field is leveled, the ground slope of the construction field is ensured to be less than 1%.
7. The plastic concrete inter-pile waterproof curtain construction method as claimed in claim 1, wherein the process of measuring and setting out is as follows:
1) after the axis angular points of the building are retested without errors, permanent identification is made and embedded;
2) measuring out each axis by using an axis angular point and a corner point to form an axis control network, and making an axis pile;
3) measuring and placing each pile position by using a coordinate and axis control net;
4) and (4) introducing elevation points, burying permanent elevation points after the field is inspected to be qualified, and marking and protecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010761605.8A CN111997042A (en) | 2020-07-31 | 2020-07-31 | Construction method of water-stop curtain between plastic concrete piles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010761605.8A CN111997042A (en) | 2020-07-31 | 2020-07-31 | Construction method of water-stop curtain between plastic concrete piles |
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| CN111997042A true CN111997042A (en) | 2020-11-27 |
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| CN202010761605.8A Pending CN111997042A (en) | 2020-07-31 | 2020-07-31 | Construction method of water-stop curtain between plastic concrete piles |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628267A (en) * | 2012-04-20 | 2012-08-08 | 吴传清 | Casing-less, long-spiral concrete secant pile construction method |
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| CN109083178A (en) * | 2018-07-24 | 2018-12-25 | 中交航局第三工程有限公司 | It is a kind of element interlocking pile at cut-pff wall water-stop curtain construction method |
| WO2020062340A1 (en) * | 2018-09-28 | 2020-04-02 | 北京高能时代环境技术股份有限公司 | Complex diaphragm wall for environmental protection of landfill in soft soil area, and construction method therefor |
| CN110963760A (en) * | 2019-12-16 | 2020-04-07 | 中建西部建设湖南有限公司 | Plastic concrete for seaport cofferdam engineering diaphragm wall and preparation method thereof |
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2020
- 2020-07-31 CN CN202010761605.8A patent/CN111997042A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628267A (en) * | 2012-04-20 | 2012-08-08 | 吴传清 | Casing-less, long-spiral concrete secant pile construction method |
| CN105887890A (en) * | 2016-04-14 | 2016-08-24 | 广州市鲁班建筑集团股份有限公司 | Plastic pile, construction method of plastic pile and foundation pit supporting watertight seal structure |
| CN109083178A (en) * | 2018-07-24 | 2018-12-25 | 中交航局第三工程有限公司 | It is a kind of element interlocking pile at cut-pff wall water-stop curtain construction method |
| WO2020062340A1 (en) * | 2018-09-28 | 2020-04-02 | 北京高能时代环境技术股份有限公司 | Complex diaphragm wall for environmental protection of landfill in soft soil area, and construction method therefor |
| CN110963760A (en) * | 2019-12-16 | 2020-04-07 | 中建西部建设湖南有限公司 | Plastic concrete for seaport cofferdam engineering diaphragm wall and preparation method thereof |
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| 《市政公用建造师一本通》编委会: "《市政公用建造师一本通》", 31 December 2006 * |
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Application publication date: 20201127 |