CN110886288B - Construction process of underground continuous wall penetrating through super-thick silt layer - Google Patents
Construction process of underground continuous wall penetrating through super-thick silt layer Download PDFInfo
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- CN110886288B CN110886288B CN201911226913.4A CN201911226913A CN110886288B CN 110886288 B CN110886288 B CN 110886288B CN 201911226913 A CN201911226913 A CN 201911226913A CN 110886288 B CN110886288 B CN 110886288B
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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
- E02D5/20—Bulkheads or similar walls made of prefabricated parts and concrete, including reinforced concrete, in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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Abstract
The invention provides a construction process of an underground continuous wall penetrating through an ultra-thick silt layer, which comprises the following steps: taking the bottom sand out of the unit groove section by using a reverse circulation desanding system, and injecting slurry into the unit groove section; installing a reinforcement cage in the unit groove section, and pouring concrete of the underground continuous wall; before the concrete of the underground continuous wall is poured, a fore shaft pipe is arranged in the groove of the H-shaped steel, the fore shaft pipe comprises a square pipe body and lifting lugs respectively arranged on two sides of the pipe body, and the square pipe body is inserted into an opening on one side of the H-shaped steel; the section of the lifting lug is semicircular; the corner of one side of the fore shaft pipe, which is far away from the lifting lug, adopts a circular arc-shaped chamfer. The invention adopts the arc-shaped chamfer and the semicircular lifting lug at the corner of the square pipe body, thereby avoiding the problems that more concrete is easy to accumulate and adhere at the corner and the bond stress of the concrete is larger.
Description
Technical Field
The invention relates to the field of a diaphragm wall construction process, in particular to a construction process of an underground diaphragm wall penetrating through an ultra-thick silt layer.
Background
At present, the underground continuous wall is a continuous underground wall body with functions of seepage prevention, soil retaining and load bearing, which is formed by digging a narrow and deep groove in the ground by using various trenching machines and by means of the wall protection effect of slurry and pouring appropriate materials in the groove.
Underground diaphragm walls belong to underground concealed engineering, and therefore, a great deal of uncertainty and unknown exists in the construction process, especially in the case of complicated stratum geological conditions, for example, in an engineering field with an ultra-thick silt layer stratum, the underground diaphragm walls are divided into the following parts from top to bottom according to the weathering degree of the stratum: the silt layer, the strong weathering layer and the medium weathering layer are formed, and the thickness of the silt layer is dozens of meters, and the silt layer is loose in structure and good in water permeability, so that the silt layer is easy to generate unfavorable geological phenomena such as sand running and the like under the condition of flowing water, the grooving quality is difficult to control, and the construction quality of the underground diaphragm wall is influenced. The existing construction process of the underground continuous wall penetrating through the ultra-thick silt layer aims at solving the problems that before grooving, three-axis cement-soil mixing piles are constructed on two sides of the underground continuous wall to be constructed, the groove wall is reinforced, and the collapse phenomenon of the silt layer is avoided by combining the arrangement of the guide wall. But in the process, H-shaped steel, a rectangular fore shaft pipe body and the fore shaft pipe fixedly connected to flanges on two sides of the fore shaft pipe body are adopted; the structure adopts the square fore shaft pipe, more concrete is easily accumulated and adhered at the corner of the fore shaft pipe, and the bond stress of the concrete is larger; the lock tube cannot be smoothly and completely ejected out in the jacking process due to the overlong jacking time of the lock tube, so that the grip force of concrete tightly holds the lock tube, and the lock tube is buried.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a construction process of an underground continuous wall penetrating through an ultra-thick silt layer, which solves the problems that the existing construction process of the underground continuous wall penetrating through the ultra-thick silt layer adopts a square locking pipe, more concrete is easily accumulated and adhered at a corner, and the bond stress of the concrete is larger; the overlong jacking time of the fore shaft pipe causes that the fore shaft pipe cannot be smoothly and completely jacked out in the jacking process, so that the grip force of concrete tightly holds the fore shaft pipe, and the fore shaft pipe is buried.
(II) technical scheme
In order to solve the technical problem, the invention provides a construction process of an underground continuous wall penetrating through an ultra-thick silt layer, which comprises the following steps:
1) paying off and slotting along the central line of the underground continuous wall to be constructed;
2) constructing and driving three-axis cement-soil mixing piles on two sides of the underground continuous wall to be constructed to reinforce the wall of the underground continuous wall; constructing a guide wall on the triaxial cement-soil mixing pile;
3) dividing the open groove into a plurality of unit groove sections, drilling holes in the unit groove sections to the strong weathering layer, replacing rotary drilling with a rotary drilling rig to carry out breaking and removing work on the medium weathering layer and the strong weathering layer when the unit groove sections are excavated to the medium weathering layer, and grabbing broken rocks in the medium weathering layer and the strong weathering layer by using the trenching machine;
4) taking the bottom sand out of the unit groove section by using a reverse circulation desanding system, and injecting slurry into the unit groove section;
5) installing a reinforcement cage into the unit groove sections, pouring concrete of the underground continuous walls, and fixedly connecting a baffle plate to the outer sides of the H-shaped steel between the adjacent underground continuous walls, wherein the baffle plate is vertically arranged in the middle of the outer sides of wing plates of the H-shaped steel; before the concrete of the underground continuous wall is poured, a fore shaft pipe is arranged in the groove of the H-shaped steel, the fore shaft pipe comprises a square pipe body and lifting lugs respectively arranged on two sides of the pipe body, and the square pipe body is inserted into an opening on one side of the H-shaped steel; the lifting lug is close to the end part of the H-shaped steel; the section of the lifting lug is semicircular; the corner of one side of the fore shaft pipe, which is far away from the lifting lug, adopts an arc chamfer; the pipe body comprises a pair of parallel reinforced side walls perpendicular to the side faces of the lifting lugs, and a flange reinforced part is arranged on the lower portion of each reinforced side wall and is wider than the top. The invention adopts the arc-shaped chamfer and the semicircular lifting lug at the corner of the square pipe body, thereby avoiding the problems that more concrete is easy to accumulate and adhere at the corner and the bond stress of the concrete is larger; the problem that the locking notch pipe cannot be smoothly and completely ejected in the jacking process due to the fact that the jacking time of the locking notch pipe is too long is avoided. The square pipe body is easy to be simultaneously provided with the flange reinforcing part, so that the lower part of the pipe body pulled out later is reinforced, the deformation of the pipe body in the pulling process is prevented, and the pulling difficulty is increased.
Preferably, the flange reinforcement extends to the top of the pipe body through an outwardly convex arc surface.
Preferably, flange reinforcing portion bottom still is equipped with the water conservancy diversion portion that extends to the outside, water conservancy diversion portion is including being located the outside and inwards sunken first curved surface and being located inboard and outwards convex second curved surface. The flow guide part is arranged, so that semi-solidified concrete is discharged downwards along the flow guide part in the jacking process, the flow velocity of the semi-solidified concrete is higher than that of the outer side of the pipe body, the semi-solidified concrete is compacted by the flow guide part, and air accumulation at the bottom is avoided.
Preferably, the curvature of the first curved surface is smaller than the curvature of the second curved surface. The curvature of the first curved surface is smaller than that of the second curved surface, so that semi-solidified concrete on the outer side of the pipe body can slide along the outer side surface conveniently.
Preferably, the first curved surface is smoothly connected to the flange reinforcing part.
Preferably, a hollow installation cavity is formed in the reinforcing side wall, the installation cavity extends from the flange reinforcing part to the flow guide part, and the width of the installation cavity in the flange reinforcing part is larger than that of the installation cavity in the flow guide part. The installation cavity is arranged, so that the overall weight is reduced, and meanwhile, the width of the installation cavity in the flange reinforcing part is larger than that of the installation cavity in the flow guide part, so that the flow guide part with larger stress is effectively prevented from being deformed under stress.
Preferably, a blade perpendicular to the inner side wall is arranged on the inner side wall of the reinforced side wall; the blade bottom end is installed the reinforcement, reinforcement one end is stretched into fixed connection and is consolidated the lateral wall in the installation cavity, the cutting edge of blade is towards the outside. The blade is arranged, so that semi-solidified concrete can be conveniently cut through the blade in the jacking and pulling process, concrete turbulence is reduced, and pulling of the fore shaft pipe is facilitated; meanwhile, the reinforcing member which extends into the mounting cavity and is fixedly connected with the reinforcing side wall is arranged, so that the width and depth of the blade are improved, the blade is prevented from deforming, the structural strength of the mounting cavity is reinforced by the reinforcing member, and the mounting cavity is effectively prevented from deforming under stress.
Preferably, the cutting edge of blade includes first cutting portion and second cutting portion, first cutting portion is by the bottom arc of upwards extending, the second cutting portion is for extending to the arc line of consolidating the lateral wall bottom by the top downwardly, and the arc line curvature of first cutting portion is less than the arc line curvature of second cutting portion. Because the bottom stress of the reinforced side wall is greater than the top stress, the camber line curvature of the first edge part is smaller than that of the second edge part, so that the firmness of the second edge part is higher than that of the first edge part, and the integral structural strength is improved.
(III) advantageous effects
The invention provides a construction process of an underground continuous wall penetrating through an ultra-thick silt layer, which has the following advantages:
1. the invention adopts the arc-shaped chamfer and the semicircular lifting lug at the corner of the square pipe body, thereby avoiding the problems that more concrete is easy to accumulate and adhere at the corner and the bond stress of the concrete is larger; the problem that the locking notch pipe cannot be smoothly and completely ejected in the jacking process due to the fact that the jacking time of the locking notch pipe is too long is avoided. The square pipe body is easy to be simultaneously provided with the flange reinforcing part, so that the lower part of the pipe body pulled out later is reinforced, the deformation of the pipe body in the pulling process is prevented, and the pulling difficulty is increased.
Drawings
FIG. 1 is an assembly view of a fore shaft pipe of examples 1 and 2 of the construction process of an underground diaphragm wall penetrating an ultra-thick silt layer according to the present invention;
fig. 2 is a sectional view of a reinforced sidewall of example 2 of the construction process of an underground diaphragm wall penetrating an ultra-thick silt layer according to the present invention.
1. The device comprises a pipe body, 2, lifting lugs, 3, a reinforcing side wall, 4, a flange reinforcing part, 5, a flow guide part, 6, a first curved surface, 7, a second curved surface, 8, a blade, 9, a reinforcing part, 10, a first edge part, 11, a second edge part, 12, a mounting cavity, 100, H-shaped steel, 200, a baffle, 300 and a locking pipe.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; may be mechanically coupled, directly coupled, or indirectly coupled through an intermediary. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in figure 1, the invention discloses a construction process of an underground continuous wall penetrating through an ultra-thick silt layer, which comprises the following steps:
1) paying off and slotting along the central line of the underground continuous wall to be constructed;
2) constructing and driving three-axis cement-soil mixing piles on two sides of the underground continuous wall to be constructed to reinforce the wall of the underground continuous wall;
3) constructing a guide wall on the triaxial cement-soil mixing pile;
4) dividing the slotting in the first step into a plurality of unit slot sections, drilling holes into the strong weathering layer in the unit slot sections, replacing rotary drilling with a rotary drilling rig to carry out the breaking and removing work of the middle weathering layer and the strong weathering layer when the slot forming machine excavates the middle weathering layer, and then grabbing broken rocks in the middle weathering layer and the strong weathering layer by using the slot forming machine;
5) a reverse circulation desanding system is utilized to bring the sand body at the bottom out of the unit groove section, slurry is injected into the unit groove section, during construction, a drilling machine of the reverse circulation desanding system extends into the silt layer, the sand body at the bottom of the silt layer is extracted, the slurry is replaced, the broken rock of the sand body in the unit groove section is replaced by the slurry, the specific gravity of the slurry is 1.18-1.20, the viscosity is 30-21 s, and the sand content is less than 1%;
6) installing a reinforcement cage into the unit groove sections, pouring concrete of the underground continuous walls, and fixedly connecting a baffle 200 to the outer sides of the H-shaped steel 100 between the adjacent underground continuous walls, wherein the baffle is vertically arranged in the middle of the outer sides of the wing plates of the H-shaped steel; before the concrete of the underground continuous wall is poured, a fore shaft pipe 300 is arranged in the groove of the H-shaped steel.
Example 2
As shown in fig. 1 and 2, the invention also discloses a fore shaft pipe, which comprises a square pipe body 1 and lifting lugs 2 respectively arranged at two sides of the pipe body, wherein the square pipe body is inserted into an opening at one side of the H-shaped steel; the lifting lug is close to the end part of the H-shaped steel; the section of the lifting lug is semicircular; the corner of one side of the fore shaft pipe, which is far away from the lifting lug, adopts an arc chamfer; the pipe body comprises a pair of parallel reinforced side walls 3 perpendicular to the side faces of the lifting lugs, and a flange reinforced part 4 is arranged at the lower part of each reinforced side wall and has a width larger than that of the top. The flange reinforcing part extends to the top of the pipe body through the convex cambered surface. The flange reinforcing portion bottom still is equipped with the water conservancy diversion portion 5 that extends to the outside, water conservancy diversion portion is including being located the outside and inwards sunken first curved surface 6 and being located inboard and outwards convex second curved surface 7.
The curvature of the first curved surface is smaller than that of the second curved surface. The curvature of the first curved surface is smaller than that of the second curved surface, so that semi-solidified concrete on the outer side of the pipe body can slide along the outer side surface conveniently. The first curved surface is smoothly connected with the flange reinforcing part.
The reinforcing side wall is internally provided with a hollow mounting cavity 12, the mounting cavity extends from the flange reinforcing part to the flow guide part, and the width of the mounting cavity in the flange reinforcing part is larger than that of the mounting cavity in the flow guide part. The inner side wall of the reinforced side wall is provided with a blade 8 vertical to the inner side wall; the reinforcing member 9 is installed to the blade bottom, reinforcing member one end is stretched into fixed connection and is consolidated the lateral wall in the installation cavity, the cutting edge of blade is towards the outside. The cutting edge of blade includes first cutting portion 10 and second cutting portion 11, first cutting portion is by the bottom arc line of upwards extending, the second cutting portion is for being extended to the pitch arc of consolidating the lateral wall bottom by the top downwardly extending, and the pitch arc camber of first cutting portion is less than the pitch arc camber of second cutting portion.
When this embodiment was implemented, be convenient for at the in-process of top-pulling, its velocity of flow of half solidified concrete along water conservancy diversion portion discharge downwards is higher than the body outside, and then by the compaction of water conservancy diversion portion, has avoided the bottom to gather the air. The semi-solidified concrete is cut through the blade in the jacking and pulling process, so that the turbulence of the concrete is reduced, and the pulling-out of the fore shaft pipe is facilitated.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode and the like of each component can be changed, and all equivalent changes and improvements made on the basis of the technical scheme of the present invention should not be excluded from the protection scope of the present invention.
Claims (1)
1. A construction process of an underground continuous wall penetrating through an ultra-thick silt layer is characterized by comprising the following steps:
1) paying off and slotting along the central line of the underground continuous wall to be constructed;
2) constructing and driving three-axis cement-soil mixing piles on two sides of the underground continuous wall to be constructed to reinforce the wall of the underground continuous wall; constructing a guide wall on the triaxial cement-soil mixing pile;
3) dividing the open groove into a plurality of unit groove sections, drilling holes into the strongly weathered layer in the unit groove sections, when the holes are excavated to the strongly weathered layer, replacing rotary drilling for breaking and removing the moderately weathered layer and the strongly weathered layer, and then using a trenching machine to grab broken rocks in the moderately weathered layer and the strongly weathered layer;
4) taking the bottom sand out of the unit groove section by using a reverse circulation desanding system, and injecting slurry into the unit groove section;
5) installing a reinforcement cage into the unit groove sections, pouring concrete of the underground continuous walls, and fixedly connecting a baffle plate to the outer sides of the H-shaped steel between the adjacent underground continuous walls, wherein the baffle plate is vertically arranged in the middle of the outer sides of wing plates of the H-shaped steel; before the concrete of the underground continuous wall is poured, a fore shaft pipe is arranged in the groove of the H-shaped steel, the fore shaft pipe comprises a square pipe body and lifting lugs respectively arranged on two sides of the pipe body, and the pipe body is inserted into an opening on one side of the H-shaped steel; the lifting lug is close to the end part of the H-shaped steel; the section of the lifting lug is semicircular; the corner of one side of the fore shaft pipe, which is far away from the lifting lug, adopts a circular arc chamfer; the pipe body comprises a pair of parallel reinforced side walls vertical to the side surfaces of the lifting lugs, the lower part of each reinforced side wall is provided with a flange reinforced part, and the width of the flange reinforced part is greater than that of the top; the bottom end of the flange reinforcing part is also provided with a flow guide part extending outwards, and the flow guide part comprises a first curved surface which is positioned on the outer side and is concave inwards and a second curved surface which is positioned on the inner side and is convex outwards; the curvature of the first curved surface is smaller than that of the second curved surface; the first curved surface is smoothly connected with the flange reinforcing part; a hollow installation cavity is arranged in the reinforced side wall, the installation cavity extends from the flange reinforcing part to the flow guide part, and the width of the installation cavity in the flange reinforcing part is larger than that of the installation cavity in the flow guide part; a blade perpendicular to the inner side wall is arranged on the inner side wall of the reinforced side wall; the bottom short end of the blade is provided with a reinforcing piece, one end of the reinforcing piece extends into the mounting cavity to be fixedly connected with a reinforcing side wall, and the cutting edge of the blade faces outwards; the cutting edge of the blade comprises a first cutting part and a second cutting part, an arc line extends upwards from the bottom of the first cutting part, the second cutting part is an arc line extending downwards from the top to the bottom of the reinforced side wall, and the curvature of the arc line of the first cutting part is smaller than that of the arc line of the second cutting part; the flange reinforcing part extends to the top of the pipe body through the convex cambered surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911226913.4A CN110886288B (en) | 2019-12-04 | 2019-12-04 | Construction process of underground continuous wall penetrating through super-thick silt layer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911226913.4A CN110886288B (en) | 2019-12-04 | 2019-12-04 | Construction process of underground continuous wall penetrating through super-thick silt layer |
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| CN110886288A CN110886288A (en) | 2020-03-17 |
| CN110886288B true CN110886288B (en) | 2021-05-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09158174A (en) * | 1995-12-13 | 1997-06-17 | Dainippon Doboku Kk | Water stopping mechanism and method between case bodies of underground continuous wall |
| CN104612179B (en) * | 2014-12-31 | 2017-03-29 | 上海市机械施工集团有限公司 | Through the construction method of the diaphram wall of super thick silty sand ground |
| CN105971118B (en) * | 2016-06-12 | 2017-11-03 | 长安大学 | Rectangle steel tubing string and the unilateral bolt connection node of H profile steel beam inner sleeve cartridge type |
| CN206887938U (en) * | 2017-04-08 | 2018-01-16 | 中铁上海工程局集团第五工程有限公司 | A kind of pipe pipe combined type fore shaft steel-pipe pile |
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Inventor after: Li Xueling Inventor after: Yu Yangun Inventor after: Qiu Zhihao Inventor after: Ye Zhengbing Inventor after: Wan Mingming Inventor before: Wan Mingming |
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Effective date of registration: 20210415 Address after: 550000 No.30 Duyun Road, Guiyang National High tech Industrial Development Zone, Guiyang City, Guizhou Province Applicant after: Tonghao Construction Group No.1 Engineering Co.,Ltd. Address before: 330000 No.13 Fanshen village, Wufeng village, Jiangxiang Town, Nanchang County, Nanchang City, Jiangxi Province Applicant before: Wan Mingming |
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