CN110528549B - Tensile crack resistant UHPC concrete open caisson structure and construction method thereof - Google Patents
Tensile crack resistant UHPC concrete open caisson structure and construction method thereof Download PDFInfo
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- CN110528549B CN110528549B CN201910695439.3A CN201910695439A CN110528549B CN 110528549 B CN110528549 B CN 110528549B CN 201910695439 A CN201910695439 A CN 201910695439A CN 110528549 B CN110528549 B CN 110528549B
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- open caisson
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- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
Abstract
The invention discloses a tensile crack resistant UHPC concrete open caisson structure, which comprises: and the first UHPC concrete layer is positioned in a potential tension fracture area at the bottom of the open caisson. According to the invention, the ultra-high performance concrete is used in the bottom area with larger tensile stress in the sinking process of the open caisson, so that the tensile property of the bottom of the open caisson is greatly enhanced, and the problem that the open caisson is easy to crack in the sinking process is solved.
Description
Technical Field
The invention relates to the field of open caisson structures. More particularly, the invention relates to a tensile crack resistant UHPC concrete open caisson structure and a construction method thereof.
Background
The open caisson foundation is large in embedding depth, strong in integrity and good in stability, and is widely applied to large-span bridge anchorages in recent years. The open caisson construction process includes the steps of firstly, manufacturing an open caisson body on the ground or a pit, namely manufacturing an open caisson component barrel body made of reinforced concrete, after the open caisson barrel body reaches a certain strength, carrying out layered excavation and soil transportation in a shaft, overcoming the frictional resistance between the outer wall of the open caisson and the soil layer by means of the dead weight of the open caisson barrel body along with the gradual reduction of the soil surface in the shaft, and continuously sinking to reach a preset construction design position.
Open caisson foundations are developed in the construction of the Nanjing Changjiang river bridge in the 60 th of the 20 th century; then, an anchorage is arranged at the north of the Yangtze river bridge (the plane size of the open caisson is 69m multiplied by 51m, and the height is 56 m); a north anchor of the four bridges of the Changjiang river of Nanjing (the plane size of the open caisson is 69m multiplied by 58m, the height is 52.8 m); north anchorage of the bridge of the Yangtze river in the parrot continent (the novel open caisson with the circular hole and the circular section has the outer diameter of 66m and the height of 43 m); the north anchorage of the bridge of Changjiang river in Maanshan (open caisson size is 60.2m multiplied by 55.4m, height is 41m) and the like are applied to a plurality of bridge projects.
After the open caisson is developed for many years, the design method and the construction process are gradually mature, but the open caisson has a huge cracking risk in the sinking construction process. Therefore, a novel open caisson structure form and a construction method are needed, so that the open caisson does not crack in the sinking process and has high application value.
Disclosure of Invention
In order to achieve the above objects, the present invention provides a tensile crack resistant UHPC concrete open caisson structure, comprising:
and the first UHPC concrete layer is positioned in a potential tension fracture area at the bottom of the open caisson.
Preferably, the tensile crack resistant UHPC concrete open caisson structure further comprises:
the second UHPC concrete layer is positioned on the surface of the first UHPC concrete layer;
and the third layer of common concrete is positioned on the surface of the second layer of UHPC concrete.
Preferably, the tensile crack resistant UHPC concrete open caisson structure is a common concrete sold in the market.
A construction method of a tensile crack resistant UHPC concrete open caisson structure comprises the following steps:
step one, determining a potential fracture area at the bottom of the open caisson;
and step two, pouring the potential tension crack area by using UHPC concrete.
Preferably, the second step of the construction method of the tensile crack resistant UHPC concrete open caisson structure specifically comprises the following steps:
step 2A, pouring a first UHPC concrete layer with the thickness of 20-30cm in a potential tension crack area;
and step 2B, pouring a second UHPC concrete layer on the surface of the first UHPC concrete layer after the first UHPC concrete layer is initially set.
Preferably, in the second step, after the step 2B, the method for constructing a tensile fracture-resistant UHPC concrete open caisson structure further includes:
and 2C, after the second UHPC concrete layer is initially set, pouring a third common concrete layer on the surface of the second UHPC concrete layer to lengthen the open caisson.
Preferably, the construction method of the tensile crack resistant UHPC concrete open caisson structure comprises the following steps between the step 2A and the step 2B and between the step 2B and the step 2C:
and coating a protective mud layer with the thickness of 2-3cm on the surface of the UHPC concrete at the lower layer.
Preferably, according to the construction method of the tensile crack resistant UHPC concrete open caisson structure, joint reinforcing steel bars are reserved when UHPC concrete is poured.
Preferably, in the construction method of the anti-tension-cracking UHPC concrete open caisson structure, when concrete is poured in the second step, before ordinary concrete is poured, the UHPC concrete poured in advance is subjected to chiseling treatment, and then steel bar binding and ordinary concrete pouring are performed.
Preferably, in the construction method of the tensile fracture resistant UHPC concrete open caisson structure, the protective slurry is prepared by the following steps:
step 1), taking 80 parts by weight of water, 20 parts by weight of cement and 30 parts by weight of red mud, stirring, mixing, standing, and obtaining a slurry initial body after the raw materials are fully fused and dissolved;
step 2), putting 2 parts by weight of sodium dodecyl benzene sulfonate into 10 parts by weight of saline water with the mass fraction of 4%, uniformly stirring, putting the mixture into a sealed container, putting 8 parts by weight of kaolin into the sealed container, introducing nitrogen into the sealed container until the pressure in the container reaches 0.08MPa, soaking for 24 hours, and carrying out the whole soaking process in an ultrasonic atmosphere; after soaking, washing for 2-3 times, and drying to obtain modified kaolin for later use;
step 3), immersing 10 parts by weight of montmorillonite in 8% by mass of potassium chloride solution, placing the montmorillonite in a sealed container, filling nitrogen into the container until the pressure in the container reaches 0.04MPa, immersing for 12 hours, immersing the montmorillonite in 12% by mass of potassium nitrate solution, placing the montmorillonite in the sealed container, filling nitrogen into the container until the pressure in the container reaches 0.06MPa, and immersing for 24 hours; and the two soaking processes are carried out in an ultrasonic environment to obtain modified montmorillonite for later use;
and 4) mixing the modified kaolin obtained in the step 2), the modified montmorillonite obtained in the step 3) and the slurry initial body obtained in the step 1) to obtain the target product protective slurry.
The invention at least comprises the following beneficial effects:
1. by using Ultra High Performance Concrete (UHPC) in the bottom area with larger tensile stress in the sinking process of the open caisson, the tensile property of the bottom of the open caisson is greatly enhanced, and the problem that the open caisson is easy to crack in the sinking process is solved;
2. the method comprises the following steps between the step 2A and the step 2B and between the step 2B and the step 2C: the protective mud layer with the thickness of 2-3cm is coated on the surface of the UHPC concrete at the lower layer, and the protective mud can improve the bleeding property of the concrete, can improve the strength of the concrete and reduce the self-contraction property of the concrete, because the protective mud adopts the red mud with the internal curing effect, in a high-pressure soaking environment, sodium dodecyl benzene sulfonate enters the space of a kaolin crystal layer, the surface of a sheet layer is modified, the distance between the crystal layers is increased, the interlayer distance of the kaolin is increased, and the modified kaolin is further fused with the red mud, so that the performance of the red mud is greatly enhanced; the whole modification process is carried out under a high-pressure state, so that the sodium dodecyl benzene sulfonate can be accelerated to enter the crystal layer space of the kaolin.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the illustrated embodiments, are only for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Example 1
Step one, after the open caisson structure design is completed, stress calculation is carried out, and a potential tension crack area is determined according to the fact that the tensile stress exceeds the allowable tensile strength of common concrete;
and step two, pouring the potential tension crack area determined in the step one by using UHPC concrete.
In embodiment 1, before the open caisson is poured, structural calculation is performed on the designed open caisson, distribution of tensile stress areas at the bottom of the open caisson under different working conditions and different supporting conditions is calculated, a potential tensile crack area is determined according to the allowable tensile strength of the tensile stress exceeding that of common concrete, and when concrete is poured, the potential tensile crack area is poured by using UHPC concrete. The confirmation method of the potential fracture zone at the bottom of the open caisson comprises the following steps: after the open caisson design is finished, after a sinking scheme is determined, calculating the stress distribution of the open caisson bottom surface under different supporting conditions and different working conditions, wherein the stress distribution generally comprises a high sinking working condition, a full-section supporting working condition and a large bottom supporting working condition every time, determining the potential tension crack area of the open caisson bottom surface under each working condition according to the allowable tension stress, and finally determining the potential tension crack area to contain the potential tension crack areas under all working conditions;
in another technical scheme, when concrete is poured in the second step, before ordinary concrete is poured, chiseling treatment should be performed on the UHPC concrete poured in advance, and then steel bar binding and ordinary concrete pouring should be performed.
In another technical scheme, when the potential fracture zone at the bottom of the open caisson is determined in the first step, structural calculation or a finite element method can be adopted for calculation.
In another technical scheme, when the UHPC concrete is poured in the step two, pouring is carried out in the potential tensile crack area obtained through calculation.
In another technical scheme, when concrete is poured in the second step, UHPC concrete is poured in each open caisson, and joint reinforcing steel bars are reserved.
In another technical scheme, when concrete is poured in the second step, before ordinary concrete is poured, chiseling treatment should be performed on the UHPC concrete poured in advance, and then steel bar binding and ordinary concrete pouring should be performed.
Example 2
A construction method of a tensile crack resistant UHPC concrete open caisson structure comprises the following steps:
step one, determining a potential fracture area at the bottom of the open caisson; the confirmation method of the potential fracture zone at the bottom of the open caisson comprises the following steps: after the open caisson design is finished, after a sinking scheme is determined, calculating the stress distribution of the open caisson bottom surface under different supporting conditions and different working conditions, wherein the stress distribution generally comprises a high sinking working condition, a full-section supporting working condition and a large bottom supporting working condition every time, determining the potential tension crack area of the open caisson bottom surface under each working condition according to the allowable tension stress, and finally determining the potential tension crack area to contain the potential tension crack areas under all working conditions;
and step two, pouring the potential tension crack area by using UHPC concrete.
Preferably, the second step of the construction method of the tensile crack resistant UHPC concrete open caisson structure specifically comprises the following steps:
step 2A, pouring a first UHPC concrete layer with the thickness of 20-30cm in a potential tension crack area;
and step 2B, after the first layer of UHPC concrete is initially set, pouring a second layer of UHPC concrete on the surface of the first layer of UHPC concrete until the top of the potential spalling area.
In another technical solution, in the second step, after step 2B, the method for constructing a tensile fracture resistant UHPC concrete open caisson structure further includes:
and 2C, after the second layer of UHPC concrete is finally set, pouring common concrete on the surface of the second layer of UHPC concrete to lengthen the open caisson.
In another technical scheme, the construction method of the tensile crack resistant UHPC concrete open caisson structure comprises the following steps between the step 2A and the step 2B and between the step 2B and the step 2C:
and coating a protective mud layer with the thickness of 2-3cm on the surface of the UHPC concrete at the lower layer.
In another technical scheme, according to the construction method of the tensile crack resistant UHPC concrete open caisson structure, joint reinforcing steel bars are reserved when UHPC concrete is poured.
In another technical scheme, in the construction method of the anti-tensile-cracking UHPC concrete open caisson structure, when concrete is poured in the second step, before ordinary concrete is poured, the UHPC concrete poured in advance is subjected to chiseling treatment, and then steel bar binding and ordinary concrete pouring are carried out.
In another technical scheme, in the construction method of the tensile crack resistant UHPC concrete open caisson structure, the protective slurry is prepared by the following steps:
step 1), taking 80 parts by weight of water, 20 parts by weight of cement and 30 parts by weight of red mud, stirring, mixing, standing, and obtaining a slurry initial body after the raw materials are fully fused and dissolved;
step 2), putting 2 parts by weight of sodium dodecyl benzene sulfonate into 10 parts by weight of saline water with the mass fraction of 4%, uniformly stirring, putting the mixture into a sealed container, putting 8 parts by weight of kaolin into the sealed container, introducing nitrogen into the sealed container until the pressure in the container reaches 0.08MPa, soaking for 24 hours, and carrying out the whole soaking process in an ultrasonic atmosphere; after soaking, washing for 2-3 times, and drying to obtain modified kaolin for later use;
step 3), immersing 10 parts by weight of montmorillonite in 8% by mass of potassium chloride solution, placing the montmorillonite in a sealed container, filling nitrogen into the container until the pressure in the container reaches 0.04MPa, immersing for 12 hours, immersing the montmorillonite in 12% by mass of potassium nitrate solution, placing the montmorillonite in the sealed container, filling nitrogen into the container until the pressure in the container reaches 0.06MPa, and immersing for 24 hours; and the two soaking processes are carried out in an ultrasonic environment to obtain modified montmorillonite for later use;
and 4) mixing the modified kaolin obtained in the step 2), the modified montmorillonite obtained in the step 3) and the slurry initial body obtained in the step 1) to obtain the target product protective slurry.
The construction method of the embodiment 1 greatly reduces the cracking probability of the bottom of the open caisson, and the construction method of the embodiment 2 completely prevents the bottom of the open caisson from cracking.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (3)
1. A construction method of a tensile crack resistant UHPC concrete open caisson structure is characterized by comprising the following steps:
step one, determining a potential fracture area at the bottom of the open caisson;
step two, pouring the potential tension crack area by using UHPC concrete;
the second step specifically comprises the following steps:
step 2A, pouring a first UHPC concrete layer with the thickness of 20-30cm in a potential tension crack area;
step 2B, after the first UHPC concrete layer is initially set, pouring a second UHPC concrete layer on the surface of the first UHPC concrete layer to the top of the potential spalling area;
in the second step, after the step 2B, the method further includes:
step 2C, after the second UHPC concrete layer is initially set, pouring a common concrete layer on the surface of the second UHPC concrete layer, and lengthening the open caisson; the common concrete is commercially available common concrete;
between step 2A and step 2B, between step 2B and step 2C, the following steps are included:
coating a protective mud layer with the thickness of 2-3cm on the surface of the UHPC concrete on the lower layer;
the protective slurry is prepared by the following steps:
step 1), taking 80 parts by weight of water, 20 parts by weight of cement and 30 parts by weight of red mud, stirring, mixing, standing, and obtaining a slurry initial body after the raw materials are fully fused and dissolved;
step 2), putting 2 parts by weight of sodium dodecyl benzene sulfonate into 10 parts by weight of saline water with the mass fraction of 4%, uniformly stirring, putting the mixture into a sealed container, putting 8 parts by weight of kaolin into the sealed container, introducing nitrogen into the sealed container until the pressure in the container reaches 0.08MPa, soaking for 24 hours, and carrying out the whole soaking process in an ultrasonic atmosphere; after soaking, washing for 2-3 times, and drying to obtain modified kaolin for later use;
step 3), immersing 10 parts by weight of montmorillonite in 8% by mass of potassium chloride solution, placing the montmorillonite in a sealed container, filling nitrogen into the container until the pressure in the container reaches 0.04MPa, immersing for 12 hours, immersing the montmorillonite in 12% by mass of potassium nitrate solution, placing the montmorillonite in the sealed container, filling nitrogen into the container until the pressure in the container reaches 0.06MPa, and immersing for 24 hours; and the two soaking processes are carried out in an ultrasonic environment to obtain modified montmorillonite for later use;
and 4) mixing the modified kaolin obtained in the step 2), the modified montmorillonite obtained in the step 3) and the slurry initial body obtained in the step 1) to obtain the target product protective slurry.
2. The construction method of the tension crack resistant UHPC concrete open caisson structure of claim 1, wherein joint reinforcing steel bars should be reserved when pouring the UHPC concrete.
3. The construction method of the tensile crack resistant UHPC concrete open caisson structure of claim 1, wherein when the concrete is poured in the second step, before the ordinary concrete is poured, the UHPC concrete poured in advance is subjected to roughening treatment, and then steel bar binding and ordinary concrete pouring are carried out.
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| JP4652009B2 (en) * | 2004-09-30 | 2011-03-16 | 株式会社建設技術研究所 | Structure |
| CN108612122A (en) * | 2018-06-05 | 2018-10-02 | 西南交通大学 | A kind of super plane size well foundation structure and its construction method |
| CN109181660A (en) * | 2018-08-30 | 2019-01-11 | 中交二航局第二工程有限公司 | Borehole wall-protection mud and its preparing process and site construction technology |
| CN109853602A (en) * | 2019-03-04 | 2019-06-07 | 中交第二航务工程局有限公司 | A kind of steel caisson and construction method of blade foot filling UHPC material |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4652009B2 (en) * | 2004-09-30 | 2011-03-16 | 株式会社建設技術研究所 | Structure |
| CN108612122A (en) * | 2018-06-05 | 2018-10-02 | 西南交通大学 | A kind of super plane size well foundation structure and its construction method |
| CN109181660A (en) * | 2018-08-30 | 2019-01-11 | 中交二航局第二工程有限公司 | Borehole wall-protection mud and its preparing process and site construction technology |
| CN109853602A (en) * | 2019-03-04 | 2019-06-07 | 中交第二航务工程局有限公司 | A kind of steel caisson and construction method of blade foot filling UHPC material |
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Effective date of registration: 20220223 Address after: 430048 No. 11 Jinyinhu Road, Dongxihu District, Wuhan City, Hubei Province Patentee after: CCCC SECOND HARBOR ENGINEERING Co.,Ltd. Patentee after: CCCC Wuhan harbor engineering design and Research Institute Co., Ltd Address before: 430048 No. 11 Jinyinhu Road, Dongxihu District, Wuhan City, Hubei Province Patentee before: CCCC SECOND HARBOR ENGINEERING Co.,Ltd. |