CN113957884A - Design and construction method of cast-in-situ bored pile-hot rod combined foundation - Google Patents

Design and construction method of cast-in-situ bored pile-hot rod combined foundation Download PDF

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CN113957884A
CN113957884A CN202111266812.7A CN202111266812A CN113957884A CN 113957884 A CN113957884 A CN 113957884A CN 202111266812 A CN202111266812 A CN 202111266812A CN 113957884 A CN113957884 A CN 113957884A
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cast
situ bored
heat
pile
section
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马红玉
廖荣坤
巴亚东
汪洋海
李亚民
李长征
喻雪
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SIPPR Engineering Group Co Ltd
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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
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

The invention discloses a design and construction method of a cast-in-situ bored pile-hot rod combined foundation, which is suitable for permafrost areas, and comprises the following steps: the construction method comprises the steps of firstly, determining a pile foundation construction drawing of the cast-in-situ bored piles according to main structure loads and ground survey reports of the building/structure, wherein the cast-in-situ bored piles located inside the building/structure are arranged in rows, the tail end of each cast-in-situ bored pile is arranged below the upper limit of frozen soil, calculating the number of hot rods needed in the building/structure according to external environment heat loads, burying the hot rods, and constructing the cast-in-situ bored piles. The invention not only can exert the advantages of high stability and large bearing capacity of the cast-in-situ bored pile, but also can reduce or even eliminate the thermal disturbance of the soil layer around the pile foundation through the strong cooling performance of the hot rod, further enhance the stability of the pile foundation, and is particularly suitable for solving the foundation treatment problem of buildings/structures which have higher requirements on foundation deformation and bearing capacity in permafrost regions.

Description

Design and construction method of cast-in-situ bored pile-hot rod combined foundation
Technical Field
The invention relates to the technical field of foundation treatment in frozen soil areas, in particular to a design and construction method of a cast-in-situ bored pile-hot rod combined foundation.
Background
Recent researches show that the pile foundation has large bearing capacity and good stability, and has small influence on soil around the pile, so that the pile foundation is increasingly applied to the field of foundation treatment of building structures in frozen soil areas in China. The pile foundation comprises a drilled inserted pile, a drilled driven pile, a drilled cast-in-place pile and the like. Among them, the cast-in-situ bored pile is most widely used in frozen soil areas because of its convenience in construction. However, thermal disturbance of the surrounding frozen earth during construction and during use of the cast-in-situ bored pile adversely affects the freezing stability of the frozen earth. The concrete expression is as follows: heat is brought in during the pile hole forming process; the cast-in-place concrete is hydrated to release heat; the good heat-conducting property of the pile body aggravates the heat exchange between the frozen soil around the pile and the atmosphere; in addition, an upward tangential frost heaving force, namely an upward pulling force, is generated on the pile in the process of unfreezing the thawed frozen soil between the piles, and the upward tangential frost heaving force has a large adverse effect on the displacement stability of the pile.
Disclosure of Invention
In order to solve the problems, the invention provides a design and construction method of a cast-in-situ bored pile-hot rod combined foundation capable of reducing or even eliminating pile foundation thermal disturbance, which can specifically adopt the following technical scheme:
the invention relates to a design and construction method of a cast-in-situ bored pile-hot rod combined foundation, which is suitable for a permafrost region, and comprises the following steps:
firstly, determining a pile foundation construction drawing of cast-in-situ bored piles according to the main structure load and a geological survey report of a building/structure, wherein the cast-in-situ bored piles positioned in the building/structure are arranged in a row, and the tail end of each cast-in-situ bored pile is arranged below the upper limit of frozen soil;
and secondly, calculating the number of the heat bars required in the building/structure according to the external environment heat load:
1) calculating the heat transfer capacity of a single hot rod
Figure DEST_PATH_IMAGE001
Wherein h is the length of the heat absorption section of the heat rod, λ is the thermal conductivity determined according to the test, TeIs the formation temperature, TwIs the wall temperature of the tube, qvFor heat flux density, R is the experimentally determined heat bar heat affected zone radius, RwThe outer radius of the base tube of the hot rod;
2) calculating external environment heat load
Figure 123379DEST_PATH_IMAGE002
Wherein W is1The heat absorbed by the permafrost foundation in the normal use state of the building/structure, W2The heat absorbed by the permafrost foundation in the pile forming process of the cast-in-situ bored pile is determined according to the pile foundation construction drawing;
3) calculating the number of hot bars required
Figure DEST_PATH_IMAGE003
；
Thirdly, constructing a hot bar
Embedding the hot rod between the in-line cast-in-situ bored piles according to a pile foundation construction drawing;
fourthly, constructing the cast-in-situ bored pile
And constructing the cast-in-situ bored pile according to the pile foundation construction drawing.
And in the first step, the cast-in-situ bored piles positioned in the building/structure are arranged in a rectangular lattice manner.
And in the third step, the heat bars and the row of the cast-in-situ bored piles are arranged in parallel, and the distance between the row of the cast-in-situ bored piles and the adjacent heat bars is smaller than the radius R of a heat affected zone of the heat bars.
The heat bars comprise a condensation section, a heat insulation section and a heat absorption section which are sequentially connected, during construction, the heat absorption section is obliquely buried below the upper limit of frozen soil on the inner side of the building/structure, the middle part of the heat insulation section is bent in an arc shape, the condensation section is positioned above the ground on the outer side of the building/structure, the arc bending section of the heat insulation section is positioned at the intersection point of the outer boundary of the building/structure and the upper limit of the frozen soil, and the excavation depth of the arc bending section is more than or equal to 2.0 m.
The two ends of the arc-shaped bending section of the heat insulation section are respectively provided with a first straight line section and a second straight line section, the first straight line section and the condensation section are arranged in a collinear way, an included angle between the first straight line section and the horizontal plane is alpha, the second straight line section and the heat absorption section are arranged in a collinear way, an included angle between the second straight line section and the horizontal plane is beta, and alpha is larger than beta.
The alpha is 45 degrees.
The heat absorption section is located at the depth of not less than 1.0-3.0m below the upper limit of the frozen soil.
According to the design and construction method of the cast-in-situ bored pile-hot rod combined foundation, the hot rods are embedded in the frozen soil around the pile, so that the advantages of high stability and large bearing capacity of the cast-in-situ bored pile can be exerted, the thermal disturbance of the soil layer around the pile foundation can be reduced or even eliminated through the strong cooling performance of the hot rods, the stability of the pile foundation is further enhanced, and the design and construction method is particularly suitable for solving the foundation treatment problem of buildings/structures which have high requirements on foundation deformation and bearing capacity in permafrost areas.
Drawings
Fig. 1 is a schematic structural view of a cast-in-situ bored pile-hot bar foundation arrangement according to the present invention.
Fig. 2 is an enlarged view from a-a of fig. 1.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the drawings, and the embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific construction processes are given, but the scope of the present invention is not limited to the following embodiments.
The design and construction method of the cast-in-situ bored pile-hot rod combined foundation is suitable for permafrost construction areas, the hot rods are embedded in frozen soil around the pile, and the thermal disturbance of the pile foundation to the soil around the pile is reduced or even eliminated through the strong cooling performance of the hot rods.
As shown in fig. 1 and 2, the cast-in-situ bored pile-hot rod combined foundation includes a cast-in-situ bored pile 1 and a hot rod 2. The cast-in-situ bored piles 1 located in the building M are arranged in a rectangular lattice mode, and the tail end of each cast-in-situ bored pile 1 is located below the upper limit K of the frozen soil; the hot-rod 2 is arranged in the gap of the row of cast-in-situ bored piles 1 or the row of cast-in-situ bored piles 1. In order to fully ensure the cooling performance of the hot rod 2, the following arrangement principle is followed: each row (column) of the cast-in-situ bored piles 1 needs to be located within the radius R of the heat affected zone of the heat bar 2, namely, the horizontal distance between the heat bar 2 and the axial line of the cast-in-situ bored piles 1 is less than or equal to R (R is the radius of the heat affected zone of the heat bar 2). During actual construction, at least one hot rod 2 is buried at the left side and the right side of each row of cast-in-situ bored piles 1 respectively; on this basis, the number of the heating rods 2 can be increased as appropriate.
Each hot rod 2 (TPAII/a 133-2/37.5-C-GB/27880-2011 type) comprises a condensation section 201, a heat insulation section 202 and a heat absorption section 203 which are connected in sequence, and when the heat-insulation heat-absorption heat-dissipation heat-absorption heat-dissipation heat-absorption heat-dissipation heat-absorption section 203. When embedding, arc bending processing needs to be performed on the heat insulation section 202, and the bent heat insulation section 202 is divided into a first straight line section, an arc bending section and a second straight line section.
During construction, the method comprises the following specific steps:
firstly, determining a pile foundation construction drawing of cast-in-situ bored piles 1 according to a main structure load and a geological survey report of a building M (a civil building in the embodiment), wherein the cast-in-situ bored piles 1 located inside the building M are arranged in a rectangular lattice manner, and the tail end of each cast-in-situ bored pile 1 is arranged at a certain distance below an upper limit K of frozen soil;
second, the number of hot bars 2 required in the building M is calculated according to the external environment heat load
1) Calculating the heat transfer capacity of a single hot rod
Suppose that: the thermal conductivity in the soil below ground D is isotropic and constant and less than that of the thermal bar 2, then the temperature field of the soil can be represented by a cylindrical coordinate form of steady state thermal conductivity:
Figure 202369DEST_PATH_IMAGE004
because the soil is in an isotropic state, the circumferential change can be ignored, namely
Figure DEST_PATH_IMAGE005
Meanwhile, as the heat conduction capability of the soil is far smaller than that of the hot rod 2, the heat conduction of the stratum along the axial direction is negligible, namely
Figure 513265DEST_PATH_IMAGE006
This heat transfer problem reduces to a one-dimensional steady state heat conduction problem.
For the case of an internal heat source, the equation can now be simplified as:
Figure DEST_PATH_IMAGE007
in the formula (I), the compound is shown in the specification,
Figure 817181DEST_PATH_IMAGE008
-heat flow density, W/m2；
Figure DEST_PATH_IMAGE009
-the outer radius of the hot rod substrate tube, m;
Figure 661247DEST_PATH_IMAGE010
-heat affected zone radius, m is determined experimentally;
Figure DEST_PATH_IMAGE011
-thermal conductivity, W/(. K) determined experimentally;
for a single hot bar: when in use
Figure 456945DEST_PATH_IMAGE012
When the temperature of the water is higher than the set temperature,
Figure DEST_PATH_IMAGE013
(wall temperature of the tube);
when in use
Figure 167719DEST_PATH_IMAGE014
When the temperature of the water is higher than the set temperature,
Figure DEST_PATH_IMAGE015
(formation temperature);
the heat transfer capacity is as follows:
Figure 415555DEST_PATH_IMAGE016
wherein h is the length of the heat absorption section of the hot rod, and m;
according to the above formula, the heat transfer capacity of the single hot rod 2 can be calculated.
2) Calculating external environment heat load
Figure DEST_PATH_IMAGE017
，
Wherein, W1-the heat, W, absorbed by the permafrost foundation in normal use of the building;
W2the heat, W, absorbed by the permafrost foundation in the pile forming process of the cast-in-situ bored pile;
3) calculating the number of hot bars required
Figure 665793DEST_PATH_IMAGE018
；
And thirdly, embedding a hot rod 2 according to a pile foundation construction drawing, wherein the hot rod 2 is positioned in the gap of the in-line cast-in-situ bored piles 1 and is arranged in parallel with the in-line cast-in-situ bored piles 1. Each row of cast-in-situ bored piles 1 are required to be positioned within the radius R of the heat affected zone of the adjacent hot rod 2, namely the horizontal distance between the hot rod 2 and the pile axis of the cast-in-situ bored pile 1 is less than or equal to R (R is the radius of the heat affected zone of the hot rod 2). During actual construction, at least one hot rod 2 is buried at the left side and the right side of each row of cast-in-situ bored piles 1 respectively; on the basis, the number of the heating rods 2 can be increased properly, so that the construction convenience and the economical efficiency are both considered.
Specifically, the heat absorbing section 203 of each heat rod 2 is embedded obliquely below the upper limit K of the frozen soil inside the building M (usually, the depth of not less than 1.0 to 3.0M below the upper limit of the frozen soil), and is bent in an arc shape at the middle of the heat insulating section 202, so that the condensing section 201 is positioned above the ground D outside the building M.
Wherein the arc-shaped bending section of the heat insulation section 202 is positioned at the intersection point of the outer boundary of the building M and the upper limit K of the frozen soil, and the excavation depth of the intersection point is more than or equal to 2.0 meters; the two ends of the arc-shaped bending section of the heat insulation section 202 are respectively a first straight line section and a second straight line section, the first straight line section is arranged in a collinear way with the condensation section 201, and has an included angle alpha (alpha is usually 45 degrees) with the horizontal plane, the second straight line section is arranged in a collinear way with the heat absorption section 203, and has an included angle beta with the horizontal plane, and alpha is larger than beta.
The inclination angle of the heat absorption section of the heat rod
Figure DEST_PATH_IMAGE019
Wherein the content of the first and second substances,
Figure 981194DEST_PATH_IMAGE020
the lowest point of the hot bar is buried by a depth m relative to the upper limit of the frozen soil;
Figure DEST_PATH_IMAGE021
relative to the upper limit of the frozen soil, the highest point burial depth m of the hot rod;
according to technical specification for the heat bar foundation in permafrost region DB 63/T1489-216, it can be known that the heat absorption section 203 of the heat bar 2 should be buried at a depth of not less than 1.0-3.0M below the upper limit K of permafrost, and the lowest point of the heat bar 2 is generally located below the central axis of the building M. Since the length H of the heat absorption section 203 of the heat rod 2 is not changed, the values of H1 and H2 can be determined according to actual conditions, and the inclination angle β of the heat absorption section 203 of the heat rod 2 can be calculated. And then rechecking whether the excavation depth of the arc bending section of the heat insulation section 202 is more than or equal to 2.0M (only aiming at the civil building foundation) and whether the arc bending section of the heat insulation section 202 is positioned at the intersection point of the building M and the upper limit K of the frozen soil, and if the excavation depth of the arc bending section of the heat insulation section 202 is not more than or equal to 2.0M, readjusting the embedding depth or the inclination angle of the hot rod 2.
And fourthly, after the hot rod is embedded, constructing the cast-in-situ bored pile 1 according to a pile foundation construction drawing, reducing and even eliminating the thermal disturbance of the pile foundation to the soil around the pile through the cooling function of the hot rod 2, and further enhancing the stability of the pile foundation.
It should be noted that in the description of the present invention, terms of orientation or positional relationship such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Claims (7)

1. A design and construction method of a cast-in-situ bored pile-hot rod combined foundation is characterized by comprising the following steps: the combined foundation is suitable for permafrost areas, and the construction method comprises the following steps:
firstly, determining a pile foundation construction drawing of cast-in-situ bored piles according to the main structure load and a geological survey report of a building/structure, wherein the cast-in-situ bored piles positioned in the building/structure are arranged in a row, and the tail end of each cast-in-situ bored pile is arranged below the upper limit of frozen soil;
and secondly, calculating the number of the heat bars required in the building/structure according to the external environment heat load:
1) calculating the heat transfer capacity of a single hot rod
Figure DEST_PATH_IMAGE002
Wherein h is the length of the heat absorption section of the heat rod, λ is the thermal conductivity determined according to the test, TeIs the formation temperature, TwIs the wall temperature of the tube, qvFor heat flux density, R is the experimentally determined heat bar heat affected zone radius, RwThe outer radius of the base tube of the hot rod;
2) calculating external environment heat load
Figure DEST_PATH_IMAGE004
Wherein W is1For the permafrost foundation suction under the normal use state of the building/structureHeat of absorption, W2The heat absorbed by the permafrost foundation in the pile forming process of the cast-in-situ bored pile is determined according to the pile foundation construction drawing;
3) calculating the number of hot bars required
Figure DEST_PATH_IMAGE006
；
Thirdly, constructing a hot bar
Embedding the hot rod between the in-line cast-in-situ bored piles according to a pile foundation construction drawing;
fourthly, constructing the cast-in-situ bored pile
And constructing the cast-in-situ bored pile according to the pile foundation construction drawing.
2. The method for designing and constructing a cast-in-situ bored pile-hot rod combined foundation according to claim 1, wherein: and in the first step, the cast-in-situ bored piles positioned in the building/structure are arranged in a rectangular lattice manner.
3. The method for designing and constructing a cast-in-situ bored pile-hot rod combined foundation according to claim 1, wherein: and in the third step, the heat bars and the row of the cast-in-situ bored piles are arranged in parallel, and the distance between the row of the cast-in-situ bored piles and the adjacent heat bars is smaller than the radius R of a heat affected zone of the heat bars.
4. The method for designing and constructing a cast-in-situ bored pile-hot rod combined foundation according to claim 1, wherein: the heat bars comprise a condensation section, a heat insulation section and a heat absorption section which are sequentially connected, during construction, the heat absorption section is obliquely buried below the upper limit of frozen soil on the inner side of the building/structure, the middle part of the heat insulation section is bent in an arc shape, the condensation section is positioned above the ground on the outer side of the building/structure, the arc bending section of the heat insulation section is positioned at the intersection point of the outer boundary of the building/structure and the upper limit of the frozen soil, and the excavation depth of the arc bending section is more than or equal to 2.0 m.
5. The method for designing and constructing a cast-in-situ bored pile-hot rod combined foundation according to claim 4, wherein: the two ends of the arc-shaped bending section of the heat insulation section are respectively provided with a first straight line section and a second straight line section, the first straight line section and the condensation section are arranged in a collinear way, an included angle between the first straight line section and the horizontal plane is alpha, the second straight line section and the heat absorption section are arranged in a collinear way, an included angle between the second straight line section and the horizontal plane is beta, and alpha is larger than beta.
6. The method for designing and constructing a cast-in-situ bored pile-hot rod combined foundation according to claim 5, wherein: the alpha is 45 degrees.
7. The method for designing and constructing a cast-in-situ bored pile-hot rod combined foundation according to claim 4, wherein: the heat absorption section is located at the depth of not less than 1.0-3.0m below the upper limit of the frozen soil.
CN202111266812.7A 2021-10-28 2021-10-28 Design and construction method of cast-in-situ bored pile-hot rod combined foundation Withdrawn CN113957884A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102817380A (en) * 2012-02-20 2012-12-12 中国科学院寒区旱区环境与工程研究所 Measure for enhancing electric transmission line tower footing frozen soil foundation stability
CN103114600A (en) * 2013-03-04 2013-05-22 中铁西北科学研究院有限公司 Method for conducting active thermal protection on tunnel shallow buried section in permafrost region using hot bar cluster
CN105113489A (en) * 2015-08-20 2015-12-02 中国科学院寒区旱区环境与工程研究所 Method of reducing concrete hydration heat of cast-in-place pile in permafrost region
CN108457655A (en) * 2018-02-01 2018-08-28 绍兴文理学院 The method for reducing Tunnel Construction in Permafrost Regions phase country rock freeze thawing circle range with hot pin
CN110185055A (en) * 2019-05-30 2019-08-30 中交第一公路勘察设计研究院有限公司 Integrated hot pin piling strtucture and its construction method
CN111910621A (en) * 2019-05-10 2020-11-10 中国科学院寒区旱区环境与工程研究所 Structure for cooling frozen soil by combining cast-in-place bored concrete pile in perennial frozen soil area with heat pipe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102817380A (en) * 2012-02-20 2012-12-12 中国科学院寒区旱区环境与工程研究所 Measure for enhancing electric transmission line tower footing frozen soil foundation stability
CN103114600A (en) * 2013-03-04 2013-05-22 中铁西北科学研究院有限公司 Method for conducting active thermal protection on tunnel shallow buried section in permafrost region using hot bar cluster
CN105113489A (en) * 2015-08-20 2015-12-02 中国科学院寒区旱区环境与工程研究所 Method of reducing concrete hydration heat of cast-in-place pile in permafrost region
CN108457655A (en) * 2018-02-01 2018-08-28 绍兴文理学院 The method for reducing Tunnel Construction in Permafrost Regions phase country rock freeze thawing circle range with hot pin
CN111910621A (en) * 2019-05-10 2020-11-10 中国科学院寒区旱区环境与工程研究所 Structure for cooling frozen soil by combining cast-in-place bored concrete pile in perennial frozen soil area with heat pipe
CN110185055A (en) * 2019-05-30 2019-08-30 中交第一公路勘察设计研究院有限公司 Integrated hot pin piling strtucture and its construction method

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