CN116516976A - Support column underpinning system for complex deep foundation pit support and construction method - Google Patents
Support column underpinning system for complex deep foundation pit support and construction method Download PDFInfo
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- CN116516976A CN116516976A CN202310282321.4A CN202310282321A CN116516976A CN 116516976 A CN116516976 A CN 116516976A CN 202310282321 A CN202310282321 A CN 202310282321A CN 116516976 A CN116516976 A CN 116516976A
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- 238000009424 underpinning Methods 0.000 title claims abstract description 76
- 238000010276 construction Methods 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 203
- 239000010959 steel Substances 0.000 claims abstract description 203
- 238000012545 processing Methods 0.000 claims abstract description 9
- 230000008093 supporting effect Effects 0.000 claims description 28
- 239000002689 soil Substances 0.000 claims description 19
- 238000003466 welding Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 210000005069 ears Anatomy 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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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
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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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
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
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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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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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
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Foundations (AREA)
Abstract
The invention relates to a support column underpinning system for a complex deep foundation pit support and a construction method, which comprises the following steps: according to the position of the stand column to be underpinned, the steel pipe passes through the steel sleeve on the connecting ring plate to be arranged at the design position; processing a plurality of sections of underpinning upright posts; the inverted-V-shaped anchor ear is oppositely pulled and clamped on two sides of each support; mounting a underpinning upright post; and removing the stand column to be underpinned. The beneficial effects of the invention are as follows: the construction speed is high, and the construction efficiency is improved by being assembled on site; the underpinning upright post among the supports replaces the upright post to be underpinned, the bottom foundation of the underpinning upright post is fixed by inserting steel pipes and connecting ring plates, the top structure of the steel pipes is welded into a whole through steel bars, concrete is poured, and finally, post grouting construction of the steel pipes is carried out to improve the bearing capacity of the foundation; the underpinning upright post and the support adopt a quick connecting structure of the U-shaped anchor ear, so that the construction efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of underground engineering, and particularly relates to a complex deep foundation pit supporting stand column underpinning system and a construction method.
Background
Along with the development of economy and the progress of society, the construction level of the construction engineering in China is continuously improved, the difficulty of foundation construction of related engineering is also increased, and in order to ensure smooth construction of complex deep foundation pits, a supporting structure is usually adopted in the foundation pits, and a ground continuous wall and supporting support are generally adopted in the complex deep foundation pit supporting mode. In engineering construction, in order to shorten the construction period and reduce the construction cost, sometimes when the structural drawing of the main body of a building is not completely determined, a foundation pit supporting project of a complex deep foundation pit is constructed in advance, and after the complex deep foundation pit is excavated in place, structural pile foundations or beam columns of a main body of an engineering project can be adjusted for various reasons, so that the constructed supporting columns and piles collide with the main pile foundations or beam columns. Therefore, it is important to solve the problem of the collision of the column with the main body.
In summary, aiming at the underpinning construction of the supporting upright post in the foundation pit, it is important to seek a complicated deep foundation pit supporting upright post underpinning system with reliable quality, simple operation and high safety and a construction method thereof.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a complex deep foundation pit supporting and supporting column underpinning system and a construction method.
This kind of complicated deep basal pit support stand underpinning system includes: the device comprises a ground connecting wall, a support, a U-shaped anchor ear, a underpinning upright post, an upright post, a connecting annular plate, steel bars, steel pipes and soil body;
the plurality of supports are horizontally arranged between the ground continuous walls, the bottom ends of the upright posts extend into soil, and the upright posts comprise upright posts to be underpinned; the underpinning upright post comprises a plurality of sections, one section is arranged between two adjacent supports, a steel pipe is arranged in the soil body, grouting holes are formed in the steel pipe, and grouting bodies are poured in the soil body outside the grouting holes; a connecting ring plate is arranged at the top end of the steel pipe, and a section of the underpinning upright post is also arranged between the support with the lowest elevation and the connecting ring plate; the connecting ring plate is provided with a concrete grouting port;
two inverted-U-shaped anchor clamps are symmetrically clamped on each support, inverted-U-shaped steel column bases are arranged at two ends of the underpinning column section arranged between the supports, inverted-U-shaped steel column bases are arranged at the top end of the underpinning column section arranged between the supports and the connecting annular plate, and expanded inverted-U-shaped steel column bases are arranged at the bottom end of the underpinning column section; the U-shaped steel column base is connected with two U-shaped hoops on the support, and the enlarged U-shaped steel column base is connected with the connecting annular plate.
As preferable: the center of the connecting ring plate is provided with a concrete grouting opening, and the connecting ring plate is provided with a steel sleeve and a threaded rod around the concrete grouting opening; the top of the steel pipe is provided with a thread section, and the bottom of the steel pipe is provided with a tip plug; the steel pipes are divided into three groups, namely a first group of steel pipes, a second group of steel pipes and a third group of steel pipes, and grouting holes of each group of steel pipes are different in height; each group of steel pipes comprises two identical steel pipes, the two steel pipes in each group of steel pipes are symmetrically inserted below the connecting ring plate through steel sleeves, and a plurality of steel bars are welded on the top structure of the steel pipes.
As preferable: the two U-shaped anchor clamps fixed on the same support are connected through a counter-pulling screw rod, and a channel steel base is arranged on each U-shaped anchor clamp; the U-shaped steel column base is connected with a channel steel base on the U-shaped anchor ear through a high-strength bolt, and a steel backing plate is further arranged on the inner wall of the lower surface of the U-shaped anchor ear connecting support; the enlarged U-shaped steel column base comprises an ear plate, a threaded rod is arranged on the connecting ring plate, and the threaded rod is fixedly connected with the ear plate of the enlarged U-shaped steel column base.
As preferable: the size of the U-shaped steel column base is matched with that of the underpinning column, and the inner wall space of the U-shaped steel column base is larger than the length of the counter-pulling screw rod; the size of the expanded U-shaped steel column base is matched with the connecting ring plate, and the inner wall interval of the expanded U-shaped steel column base is larger than the distance between the steel sleeves.
As preferable: the several hoops and the connecting ring plates connected to each support are located on the same vertical axis, and the segments of the underpinning upright are arranged on the same vertical axis.
The construction method of the complex deep foundation pit supporting and supporting upright post underpinning system comprises the following steps:
step one, stand column positioning is carried out: according to the position of the stand column to be underpinned, a connecting ring plate is arranged, a steel pipe penetrates through a steel sleeve on the connecting ring plate to be arranged at a designed position, and soil around the steel pipe is excavated; welding the steel pipe and the connecting ring plate into a whole through the steel bar; pouring concrete through the concrete grouting openings of the connecting annular plates; finally, sequentially performing post grouting construction on the first group of steel pipes, the second group of steel pipes and the third group of steel pipes to form a grouting body;
step three, stand column processing is carried out: processing a plurality of sections of underpinning upright posts, wherein the bottom end of the underpinning upright post connected with the connecting annular plate is provided with an enlarged U-shaped steel column base, the top end of the underpinning upright post is provided with a U-shaped steel column base, and the two ends of the rest underpinning upright posts are provided with U-shaped steel column bases;
step four, installing a U-shaped anchor ear: the inverted-V-shaped anchor ear is oppositely pulled and clamped on two sides of each support;
step five, mounting a underpinning upright post: and (3) installing the underpinning upright post, wherein the U-shaped steel column foot is fixedly connected with the U-shaped anchor ear, and the enlarged U-shaped steel column foot is fixedly connected with the connecting annular plate.
Step six, dismantling the stand column to be underpinned: and removing the stand column to be underpinned.
Preferably, in the first step: the depth of soil around the excavated steel pipe is 0.8 m-1.1 m.
Preferably, in the fourth step: the steel backing plate is arranged on the inner wall of the lower surface of the connection support of the U-shaped anchor ear, and the U-shaped anchor ear is oppositely pulled and clamped on two sides of each support and then is oppositely pulled and fixed through the oppositely pulled screw rod.
The beneficial effects of the invention are as follows:
1) The complex deep foundation pit supporting and supporting column underpinning system is characterized in that the steel anchor ear, the steel column and the like are prefabricated and processed in factories, the construction speed is high, the steel anchor ear, the steel column and the like are assembled on site, and the construction efficiency is improved.
2) According to the complex deep foundation pit supporting stand column underpinning system, stand columns to be underpinned are replaced by underpinned stand columns among all the supporting columns, the bottom foundation of each underpinned stand column is fixedly inserted through steel pipes and connecting ring plates, the top structures of the steel pipes are welded into a whole through steel bars, concrete is poured, and finally the bearing capacity of the foundation is improved through post grouting construction of the steel pipes.
3) According to the invention, the underpinning upright post and the support adopt a quick connection structure of the U-shaped anchor ear, so that the construction efficiency is improved.
Drawings
FIG. 1 is a schematic cross-sectional view of a complex deep foundation pit support column underpinning architecture;
FIG. 2 is a schematic cross-sectional view of a foundation connection portion of a underpinning column;
FIG. 3 is a schematic plan view of a connecting ring plate;
FIG. 4 is a schematic view of a three-dimensional bulk sample of a connecting ring plate;
FIG. 5 is a schematic view of a steel pipe bulk sample;
FIG. 6 is a schematic plan view of a steel pipe arrangement;
FIG. 7 is a schematic view of a cross section of a tee anchor and support;
FIG. 8 is a schematic view of a tee anchor and support fixture elevation;
FIG. 9 is a schematic diagram of a underpinning column layout;
FIG. 10 is a schematic diagram of a large sample of underpinning column foundation connection segments;
FIG. 11 is a schematic plan view of a bracket column and a section steel column foot;
fig. 12 is a flow chart of the construction process of the present invention.
In the figure: the concrete grouting device comprises a ground connecting wall 1, a support 2, a stand column 3 to be underpinned, a U-shaped anchor ear 4, an underpinned stand column 5, a stand column 6, a threaded rod 7, a connecting ring plate 8, a reinforcing steel bar 9, a grouting body 10, a steel pipe 11, a soil body 12, an ear plate 13, a grouting hole 14, a concrete grouting opening 15, a steel sleeve 16, a threaded section 17, a first group of steel pipes 18, a second group of steel pipes 19, a third group of steel pipes 20, a high-strength bolt 21, a U-shaped steel column base 22, a channel steel base 23, a steel base plate 24, a counter-pulling screw 25 and an enlarged U-shaped steel column base 26.
Detailed Description
The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present invention without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Example 1
As an embodiment, as shown in fig. 1 to 11, a complex deep foundation pit supporting support column underpinning system includes: the wall comprises a ground connecting wall 1, a support 2, a U-shaped anchor ear 4, a underpinning upright post 5, an upright post 6, a connecting annular plate 8, reinforcing steel bars 9, a steel pipe 11 and a soil body 12;
as shown in fig. 1 and 2, a plurality of supports 2 are horizontally arranged between the ground continuous walls 1, the bottom ends of the upright posts 6 extend into soil 12, and the upright posts 6 comprise upright posts 3 to be underpinned; the underpinning upright post 5 comprises a plurality of segments, one segment is arranged between two adjacent supports 2, a steel pipe 11 is arranged in a soil body 12, grouting holes 14 are formed in the steel pipe 11, grouting bodies 10 are poured in the soil body outside the grouting holes 14, and the bearing capacity of the foundation of the underpinning upright post 5 is improved; the top end of the steel pipe 11 is provided with a connecting annular plate 8, and a section of the underpinning upright post 5 is also arranged between the support 2 with the lowest elevation and the connecting annular plate 8.
As shown in fig. 3 to 6, a concrete grouting opening 15 is arranged in the center of the connecting ring plate 8, and a steel sleeve 16 and a threaded rod 7 are arranged on the connecting ring plate 8 around the concrete grouting opening 15; the top of the steel pipe 11 is provided with a thread section 17, and the bottom is provided with a tip plug 16; the steel pipes 11 are divided into three groups, namely a first group of steel pipes 18, a second group of steel pipes 19 and a third group of steel pipes 20, and the grouting holes 14 of each group of steel pipes 11 are different in height, so that grouting bodies 10 are formed in soil bodies 12 at different heights; each group of steel pipes 11 comprises two identical steel pipes 11, the two steel pipes 11 in each group of steel pipes 11 are symmetrically inserted below the connecting ring plate 8 through the steel sleeve 16, a plurality of steel bars 9 are welded on the top structure of the steel pipes 11, so that the steel pipes 11, the steel sleeve 16 and the connecting ring plate 8 are welded into a whole, and the supporting force of the foundation of the underpinning upright post 5 is improved.
As shown in fig. 7 and 8, two horizontal hoops 4 are symmetrically clamped on each support 2, the clamping width of each horizontal hoop 4 is 3 cm-5 cm higher than the height of each support 2, the horizontal hoops 4 are guaranteed to be rapidly clamped on the supports 2, the inner wall of the lower surface of each horizontal hoop 4 connected with the supports 2 is also provided with a steel backing plate 24, each horizontal hoop 4 and the connecting ring plate 8 connected with each support 2 are positioned on the same vertical axis, and a plurality of sections of the underpinning upright posts 5 are arranged on the same vertical axis to form a vertical supporting effect capable of replacing the upright post 3 to be underpinned.
As shown in fig. 9 and 11, both ends of the segment of the underpinning upright 5 arranged between the supports 2 are respectively provided with a U-shaped steel column base 22, the top end of the segment of the underpinning upright 5 arranged between the supports 2 and the connecting annular plate 8 is provided with a U-shaped steel column base 22, and the bottom end is provided with an enlarged U-shaped steel column base 26; the U-shaped steel column base 22 is connected with two U-shaped hoops 4 on the support 2, and the enlarged U-shaped steel column base 26 is connected with the connecting ring plate 8.
As shown in fig. 2 and 7, two horizontal anchor ears 4 fixed on the same support 2 are connected through a counter-pulling screw 25, and a channel steel base 23 is arranged on each horizontal anchor ear 4; the U-shaped steel column base 22 is connected with a channel steel base 23 on the U-shaped anchor ear 4 through a high-strength bolt 21; the enlarged U-shaped steel column base 26 comprises an ear plate 13, a threaded rod 7 is arranged on the connecting ring plate 8, and the threaded rod 7 is fixedly connected with the ear plate 13 of the enlarged U-shaped steel column base 26.
The size of the U-shaped steel column base 22 is matched with that of the underpinning upright column 5, and the inner wall space of the U-shaped steel column base 22 is larger than the length of the opposite-pulling screw rod 25; the enlarged size of the steel column feet 26 matches with the connecting ring plate 8, and the inner wall spacing of the enlarged steel column feet 26 is larger than the distance between the steel sleeves 16.
Example two
As another embodiment, as shown in fig. 12, the method for performing the underpinning of the complex deep foundation pit supporting column according to the complex deep foundation pit supporting column underpinning system proposed in the first embodiment includes the following steps:
step one, stand column positioning is carried out: and according to the position of the stand column 3 to be underpinned, paying-off and positioning of the foundation and the support 2 of the underpinned stand column 5 are carried out.
Step two, underpinning pile foundation construction: the foundation of the underpinning upright post 5 is fixedly inserted between the steel pipe 11 and the connecting ring plate 8, the top structure of the steel pipe 11 is welded into a whole through the steel bar 9, concrete is poured, and finally grouting construction is carried out after the steel pipe 11, so that the bearing capacity of the foundation is improved;
the method comprises the following steps: 6 steel sleeves 16 and 4 threaded rods 7 are arranged on the connecting ring plate 8, and the steel sleeves 16 and the threaded rods 7 are uniformly arranged on the connecting ring plate 8; a concrete grouting port 15 is arranged in the middle of the connecting annular plate 8; the steel pipes 11 are divided into 3 groups, namely a first group of steel pipes 18, a second group of steel pipes 19 and a third group of steel pipes 20, wherein each group comprises two steel pipes 11, grouting holes 14 with different heights are formed in the steel pipes 11 in different groups, grouting holes 14 with the same height are formed in the same group of steel pipes 11, a threaded section 17 is formed in the top of each steel pipe 11, and a tip plug 16 is arranged at the bottom of each steel pipe; two steel pipes 11 in the first group of steel pipes 18, the second group of steel pipes 19 and the third group of steel pipes 20 are respectively symmetrically inserted into the steel sleeve 16;
the steel pipe 11 is symmetrically arranged to a designed position by a vibrating hydraulic pile driver, and the depth of soil 12 around the steel pipe 11 is excavated to be 0.8 m-1.1 m; adjusting the elevation and the position of the connecting ring plate 8; the steel pipe 11, the steel sleeve 16 and the connecting ring plate 8 are welded into a whole through the steel bar 9; the steel bar 9 is welded to complete formwork supporting, concrete is poured through the concrete grouting openings 15 of the connecting ring plates 8, and maintenance is carried out; and finally, connecting the grouting machine with a threaded section 17 arranged at the top of the steel pipe 11, and performing post grouting construction, wherein the post grouting construction is sequentially performed on a first group of steel pipes 18, a second group of steel pipes 19 and a third group of steel pipes 20, so as to form three groups of grouting bodies 10 with different depths.
Step three, stand column processing is carried out: and processing a plurality of sections of underpinning upright posts 5, wherein the underpinning upright posts 5 are steel upright posts, an enlarged U-shaped steel column base 26 is arranged at the bottom end of the underpinning upright posts 5 connected with the connecting ring plate 8, a U-shaped steel column base 22 is arranged at the top end, and the two ends of the rest underpinning upright posts 5 are provided with the U-shaped steel column bases 22.
Fourthly, processing and installing the U-shaped anchor ear: the U-shaped anchor ear 4 is formed by processing a thick steel plate, and a channel steel base 23 is arranged on each half U-shaped anchor ear 4; the height of the U-shaped anchor ear 4 is 3 cm-5 cm higher than that of the support 2, the U-shaped anchor ear 4 can be fast clamped on the support 2, the U-shaped anchor ears 4 are mutually fixed through opposite-pull screws 25, and a steel backing plate 24 is arranged at the lower part of the U-shaped anchor ear 4.
Step five, mounting a underpinning upright post: the underpinning upright post 5 is installed, and the U-shaped steel column base 22 is fixedly connected with the channel steel base 23 on the U-shaped anchor ear 4 through the high-strength bolt 21; the enlarged U-shaped steel column base 26 is connected with the threaded rod 7 on the connecting ring plate 8 through a high-strength bolt.
Step six, dismantling the stand column to be underpinned: after the underpinning upright post 5 is installed, the upright post 3 to be underpinned is dismantled.
Claims (8)
1. A complicated deep basal pit support stand underpinning system, its characterized in that includes: the ground connecting wall (1), the support (2), the U-shaped anchor ear (4), the underpinning upright post (5), the upright post (6), the connecting annular plate (8), the steel bar (9), the steel pipe (11) and the soil body (12);
the plurality of supports (2) are horizontally arranged between the ground continuous walls (1), the bottom ends of the stand columns (6) extend into soil bodies (12), and the stand columns (6) comprise stand columns (3) to be underpinned; the underpinning upright post (5) comprises a plurality of sections, one section is arranged between two adjacent supports (2), a steel pipe (11) is arranged in a soil body (12), grouting holes (14) are formed in the steel pipe (11), and grouting bodies (10) are poured in the soil body outside the grouting holes (14); a connecting annular plate (8) is arranged at the top end of the steel pipe (11), and a section of the underpinning upright post (5) is also arranged between the support (2) with the lowest elevation and the connecting annular plate (8); a concrete grouting opening (15) is arranged on the connecting annular plate (8);
two U-shaped anchor clamps (4) are symmetrically clamped on each support (2), two U-shaped steel column bases (22) are respectively arranged at two ends of a section of the underpinning column (5) arranged between the supports (2), the U-shaped steel column bases (22) are arranged at the top ends of the sections of the underpinning column (5) arranged between the supports (2) and the connecting annular plate (8), and an enlarged U-shaped steel column base (26) is arranged at the bottom ends of the sections of the underpinning column (5); the U-shaped steel column base (22) is connected with two U-shaped anchor clamps (4) on the support (2), and the enlarged U-shaped steel column base (26) is connected with the connecting annular plate (8).
2. The complex deep foundation pit support stand underpinning system of claim 1, wherein: a concrete grouting opening (15) is arranged in the center of the connecting annular plate (8), and a steel sleeve (16) and a threaded rod (7) are arranged on the connecting annular plate (8) around the concrete grouting opening (15); the top of the steel pipe (11) is provided with a thread section (17), and the bottom is provided with a tip plug (16); the steel pipes (11) are divided into three groups, namely a first group of steel pipes (18), a second group of steel pipes (19) and a third group of steel pipes (20), and grouting holes (14) of each group of steel pipes (11) are different in height; each group of steel pipes (11) comprises two identical steel pipes (11), the two steel pipes (11) in each group of steel pipes (11) are symmetrically inserted below the connecting annular plate (8) through the steel sleeve (16), and a plurality of steel bars (9) are welded on the top structure of the steel pipes (11).
3. The complex deep foundation pit support stand underpinning system of claim 1, wherein: two U-shaped anchor clamps (4) fixed on the same support (2) are connected through a counter-pulling screw (25), and a channel steel base (23) is arranged on each U-shaped anchor clamp (4); the U-shaped steel column base (22) is connected with a channel steel base (23) on the U-shaped anchor ear (4) through a high-strength bolt (21), and a steel backing plate (24) is further arranged on the inner wall of the lower surface of the U-shaped anchor ear (4) connected with the support (2); the enlarged U-shaped steel column base (26) comprises an ear plate (13), a threaded rod (7) is arranged on the connecting ring plate (8), and the threaded rod (7) is fixedly connected with the ear plate (13) of the enlarged U-shaped steel column base (26).
4. A complex deep foundation pit support stand underpinning system as claimed in claim 3, wherein: the size of the U-shaped steel column base (22) is matched with that of the underpinning upright column (5), and the inner wall space of the U-shaped steel column base (22) is larger than the length of the opposite-pulling screw rod (25); the size of the enlarged U-shaped steel column base (26) is matched with the connecting annular plate (8), and the inner wall spacing of the enlarged U-shaped steel column base (26) is larger than the distance between the steel sleeves (16).
5. The complex deep foundation pit support stand underpinning system of claim 1, wherein: the several-shaped hoops (4) and the connecting ring plates (8) which are connected on each support (2) are positioned on the same vertical axis, and the several sections of the underpinning upright posts (5) are arranged on the same vertical axis.
6. The construction method of the complex deep foundation pit supporting and supporting column underpinning system as claimed in any one of claims 1 to 5, comprising the following steps:
step one, stand column positioning is carried out: according to the position of the upright post (3) to be underpinned, a connecting annular plate (8) is arranged, a steel pipe (11) passes through a steel sleeve (16) on the connecting annular plate (8) to be arranged at a design position, and soil bodies (12) around the steel pipe (11) are excavated; welding the steel pipe (11) and the connecting ring plate (8) into a whole through the steel bar (9); pouring concrete through a concrete grouting opening (15) of the connecting annular plate (8); finally, sequentially performing post grouting construction on the first group of steel pipes (18), the second group of steel pipes (19) and the third group of steel pipes (20) to form a grouting body (10);
step three, stand column processing is carried out: processing a plurality of sections of underpinning upright posts (5), arranging expanded U-shaped steel column bases (26) at the bottom ends of the underpinning upright posts (5) connected with the connecting ring plates (8), arranging U-shaped steel column bases (22) at the top ends, and arranging U-shaped steel column bases (22) at the two ends of the rest underpinning upright posts (5);
step four, installing a U-shaped anchor ear: the counter-pulling clamping of the U-shaped anchor clamps (4) is carried out on the two sides of each support (2);
step five, mounting a underpinning upright post: the support and exchange upright post (5) is arranged, the U-shaped steel column foot (22) is fixedly connected with the U-shaped anchor ear (4), and the enlarged U-shaped steel column foot (26) is fixedly connected with the connecting annular plate (8).
Step six, dismantling the stand column to be underpinned: and dismantling the stand column (3) to be replaced.
7. The construction method of the complex deep foundation pit supporting and supporting column underpinning system according to claim 6, wherein in the first step: the depth of soil (12) around the excavated steel pipe (11) is 0.8 m-1.1 m.
8. The construction method of the complex deep foundation pit supporting and supporting column underpinning system according to claim 6, wherein in the fourth step: the steel backing plates (24) are arranged on the inner walls of the lower surfaces of the connection supports (2) of the U-shaped anchor clamps (4), and the U-shaped anchor clamps (4) are oppositely pulled and fixed on the two sides of each support (2) through opposite pulling screws (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310282321.4A CN116516976A (en) | 2023-03-21 | 2023-03-21 | Support column underpinning system for complex deep foundation pit support and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310282321.4A CN116516976A (en) | 2023-03-21 | 2023-03-21 | Support column underpinning system for complex deep foundation pit support and construction method |
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| Publication Number | Publication Date |
|---|---|
| CN116516976A true CN116516976A (en) | 2023-08-01 |
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| CN202310282321.4A Pending CN116516976A (en) | 2023-03-21 | 2023-03-21 | Support column underpinning system for complex deep foundation pit support and construction method |
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| Country | Link |
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| CN (1) | CN116516976A (en) |
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