CN116180757A - Deep foundation pit supporting system - Google Patents
Deep foundation pit supporting system Download PDFInfo
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- CN116180757A CN116180757A CN202310197342.6A CN202310197342A CN116180757A CN 116180757 A CN116180757 A CN 116180757A CN 202310197342 A CN202310197342 A CN 202310197342A CN 116180757 A CN116180757 A CN 116180757A
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- foundation pit
- support
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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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
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Foundations (AREA)
Abstract
The deep foundation pit supporting system aims at the problems that when a basement top plate and the ground are not located on the same horizontal plane, an inner support is required to be arranged in a large area in a foundation pit for reinforcing supporting, the inner support is complex and tedious in mounting and dismounting operation, a large amount of manpower and material resources are consumed, and engineering cost is increased. The foundation pit vertical support is positioned at the bottom of the central part of the second structural beam plate of the basement and fixedly connected with the same, a plurality of inclined throwing supports are arranged between the foundation pit support structure and the central part of the second structural beam plate of the basement at intervals, one end of each inclined throwing support is fixedly connected to the top end of the foundation pit support structure, the other end of each inclined throwing support is fixedly connected to the top of the edge of the central part of the second structural beam plate of the basement, and the foundation pit support structure, the inclined throwing supports, the foundation pit vertical supports and the central part of the second structural beam plate of the basement are mutually connected to form a supporting structure stress system.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering foundation pit support, in particular to a deep foundation pit support system.
Background
In recent years, with the acceleration of the urban process, the development and utilization degree of underground space is continuously increased, the depth of a foundation pit is deeper and deeper, and the construction space of a supporting structure is also more limited. The forward construction method has the advantages of simple operation, high speed, low cost, simple supporting framework, easy mastering of construction period and easy control of engineering quality, but larger damage to surrounding environment; the reverse construction method is to take beams, plates and columns of the underground main body structure as transverse supports of the retaining wall, so that the construction period can be greatly shortened, the earthwork quantity is reduced, the construction safety is improved, but the concrete joint quality of the wall columns in the underground structure is difficult to control.
At present, in the building engineering of forward and reverse synchronous construction, a basement roof is usually used as a first support, each layer of structure is constructed on the ground by adopting forward construction method above the basement roof, each layer of structure is constructed below the basement roof by adopting reverse construction method, however, when the basement roof and the ground are not positioned on the same horizontal plane, the basement roof cannot be used as an enclosure structure to provide support, the deformation of the enclosure structure is increased due to overlong cantilever in the excavation process of a foundation pit, the inner support is required to be arranged in a large area in the foundation pit for reinforcing support, the installation and the disassembly operations of the inner support are complex and complicated, a large amount of manpower and material resources are consumed, and the engineering cost is increased.
Disclosure of Invention
When the top plate of the basement is not positioned on the same horizontal plane with the ground, the inner support is required to be arranged in the foundation pit in a large area for reinforcing support, the inner support is complex and tedious in installation and disassembly operation, a large amount of manpower and material resources are consumed, and the engineering cost is increased. The invention aims to provide a deep foundation pit supporting system.
The technical scheme adopted for solving the technical problems is as follows: a deep foundation pit supporting system comprises a foundation pit support structure, inclined throws, foundation pit vertical supports and a central part of a second structural beam plate of a basement, wherein the plurality of foundation pit vertical supports are positioned at the bottom of the central part of the second structural beam plate of the basement and fixedly connected with the same, a plurality of inclined throws are arranged between the foundation pit support structure and the central part of the second structural beam plate of the basement at intervals, one end of each inclined throws is fixedly connected to the top end of the foundation pit support structure, the other end of each inclined throws is fixedly connected to the top of the edge of the central part of the second structural beam plate of the basement, and the foundation pit support structure, the inclined throws, the foundation pit vertical supports and the central part of the second structural beam plate of the basement are mutually connected to form a supporting structure stress system.
The deep foundation pit supporting system comprises a foundation pit supporting structure, inclined throws, foundation pit vertical supports and a central part of a second structural beam slab of a basement, wherein the plurality of foundation pit vertical supports are positioned at the bottom of the central part of the second structural beam slab of the basement and fixedly connected with the same, and the plurality of inclined throws are arranged at intervals and fixedly connected between the foundation pit supporting structure and the central part of the second structural beam slab of the basement, so that the foundation pit supporting structure, the inclined throws, the foundation pit vertical supports and the central part of the second structural beam slab of the basement are mutually connected to form a supporting structure stress system, and the deep foundation pit supporting system has at least the following beneficial effects:
1. because the middle part of the beam slab of the second channel structure of the basement is poured in advance, and the inclined throwing support is additionally arranged between the foundation pit support structure and the beam slab of the second channel structure of the basement, the foundation pit support structure, the inclined throwing support, the vertical support of the foundation pit and part of the main body structure are mutually connected to form a complete supporting structure stress system so as to resist the peripheral water and soil pressure, construction load and the like, the supporting framework in the foundation pit is simplified, the construction efficiency is improved, the construction period is shortened, the adverse factors of long construction period, environmental pollution and the like caused by the erection and the dismantling of the horizontal support in the conventional forward construction are avoided, in addition, the construction cost is effectively saved, and the green construction is realized;
2. the second structural beam plate of the basement is used as the first horizontal support of the reverse construction method, namely, the forward and reverse combined up and down synchronous construction is carried out under the ground, so that the number of layers of the reverse construction is reduced, the construction difficulty is reduced, the time for waiting for the structural beam plate to reach the design strength is shortened, the construction efficiency is accelerated, and the engineering cost is reduced;
3. in order to meet the requirement of the vertical bearing capacity of one column and one pile, the cross section size of the lattice pile is often larger than that of the basement structural pile, so that the structural pile cannot be wrapped by the structural pile.
Preferably, the foundation pit enclosure structure comprises an underground diaphragm wall, triaxial cement mixing piles, large-diameter high-pressure jet grouting piles, concrete guide walls and a capping beam, wherein the triaxial cement mixing piles are respectively arranged on two sides of a groove section where the underground diaphragm wall is located, the large-diameter high-pressure jet grouting piles are arranged at joints of the underground diaphragm wall, the L-shaped integral casting type concrete guide wall is arranged at the top of the outside triaxial cement mixing piles, one end of each concrete guide wall is arranged at the inner side of each triaxial cement mixing pile, the other end of each concrete guide wall is arranged at the top of each triaxial cement mixing pile, the capping beam is arranged at the top of the underground diaphragm wall, and reserved main ribs are arranged on the capping beam.
Preferably, the concrete support is fixedly connected to the joint between the top of the edge of the central part of the beam slab of the second channel of the basement and the structural column of the basement, the steel support is riveted on the side surface of the top beam, one end of the inclined throwing support is welded on the steel support, and the other end of the inclined throwing support is riveted on the concrete support through an anchor plate.
Preferably, the foundation pit vertical support comprises upright posts and lattice piles vertically connected to the tops of the upright posts, and the tops of the lattice piles are connected to the bottom of the central part of the second structural beam plate of the basement.
Preferably, a reserved main rib is arranged at the end part of the central part of the second channel structure beam plate of the basement.
Drawings
FIG. 1 is a schematic illustration of sequential excavation of a center island region of an embodiment of a deep foundation pit support system of the present invention;
FIG. 2 is a schematic illustration of a deep foundation pit support system of the present invention with diagonal bracing between a first structural beam panel and a top roof beam of a basement.
Fig. 3 is a schematic diagram of forward and reverse synchronous construction in an embodiment of the deep foundation pit supporting system of the present invention.
The labels in the figures are as follows:
a column pile 1; lattice piles 2; a concrete panel 3; a dowel bar 4; anchor bars 5; a diaphragm wall 11; a triaxial cement-soil mixing pile 12; high pressure jet grouting piles 14; a concrete guide wall 15; a capping beam 16; reserving a main rib 17; a basement first structural beam plate 21; a second structural beam plate 22 of the basement; a structural column 25; a concrete support 26; a steel support 27; and a diagonal slinging support 28.
Detailed Description
The invention is described in further detail below with reference to the drawings and the specific examples. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. For convenience of description, the "upper" and "lower" described below are consistent with the upper and lower directions of the drawings, but this should not be construed as a limitation of the technical scheme of the present invention.
In this embodiment, the basement roof (i.e. the basement first structural beam plate 21) is located above the leveling floor, and the deep foundation pit supporting system of the present invention is described below with reference to fig. 1 to 3, which comprises: the foundation pit support structure, the inclined throwing support 28, the foundation pit vertical support and the central part of the second channel structure beam plate 22 are fixedly connected, the plurality of foundation pit vertical supports are positioned at the bottom of the central part of the second channel structure beam plate 22 and fixedly connected with the same, the plurality of inclined throwing support 28 are arranged between the foundation pit support structure and the central part of the second channel structure beam plate 22 at intervals, one end of the inclined throwing support 28 is fixedly connected to the top end of the foundation pit support structure, the other end of the inclined throwing support 28 is fixedly connected to the top of the edge of the central part of the second channel structure beam plate 22, and the foundation pit support structure, the inclined throwing support 28, the foundation pit vertical support and the central part of the second channel structure beam plate 22 are mutually connected to form a supporting structure stress system.
The invention relates to a deep foundation pit supporting system, which comprises a foundation pit support structure, inclined slings 28, foundation pit vertical supports and a central part of a second-channel structure beam plate 22 of a basement, wherein a plurality of foundation pit vertical supports are positioned at the bottom of the central part of the second-channel structure beam plate 22 of the basement and fixedly connected with the same, and a plurality of inclined slings 28 are arranged at intervals and fixedly connected between the foundation pit support structure and the central part of the second-channel structure beam plate 22 of the basement, so that the foundation pit support structure, the inclined slings 28, the foundation pit vertical supports and the central part of the second-channel structure beam plate 22 of the basement are mutually connected to form a supporting structure stress system, and the deep foundation pit supporting system has at least the following beneficial effects:
1. because the center part of the second-path structural beam slab 22 of the basement is poured in advance, and the diagonal bracing 28 is additionally arranged between the foundation pit support structure and the second-path structural beam slab 22 of the basement, the foundation pit support structure, the diagonal bracing 28, the vertical support of the foundation pit and part of the main body structure are mutually connected to form a complete supporting structure stress system so as to resist the peripheral water and soil pressure, construction load and the like, the supporting framework in the foundation pit is simplified, the construction efficiency is improved, the construction period is shortened, the adverse factors of long construction period, environmental pollution and the like caused by the erection and the dismantling of horizontal supports in the conventional forward construction are avoided, in addition, the engineering cost is effectively saved, and the green construction is realized;
2. because the second structural beam plate 22 of the basement is used as the first horizontal support of the reverse construction method, namely, the forward and reverse combined up and down synchronous construction is carried out under the ground, the number of layers of the reverse construction is reduced, the construction difficulty is reduced, the time for waiting for the structural beam plate to reach the design strength is shortened, the construction efficiency is accelerated, and the engineering cost is reduced;
3. in order to meet the requirement of the vertical bearing capacity of one column and one pile, the cross section size of the lattice pile 2 is often larger than that of the basement structural column 25, so that the structural column 25 cannot wrap the lattice pile 2.
As shown in fig. 2, the foundation pit enclosure structure of the present embodiment includes an underground diaphragm wall 11, a triaxial cement mixing pile 12, a large-diameter high-pressure jet grouting pile 14, a concrete guide wall 15 and a capping beam 16, wherein the triaxial cement mixing pile 12 is disposed on two sides of a groove section where the underground diaphragm wall 11 is located for reinforcing the groove wall so as to ensure the safety of the underground diaphragm wall 11 in forming the groove, the RJP large-diameter high-pressure jet grouting pile 14 is disposed at a joint of the underground diaphragm wall 11 for sealing water, the L-shaped integrally cast concrete guide wall 15 is disposed at the top of the triaxial cement mixing pile 12 on the outer side, one end of the concrete guide wall 15 is disposed inside the triaxial cement mixing pile 12, the other end of the concrete guide wall 15 is disposed at the top of the triaxial cement mixing pile 12, the capping beam 16 is disposed at the top of the underground diaphragm wall 11, and the capping beam 16 is provided with a reserved main rib 17 so as to be connected with a main rib of an outer wall of a basement for later construction.
With continued reference to fig. 1, a layer of soil body under the foundation pit is excavated in a manner that the width of a slope-placing platform is more than or equal to 3m, the slope-placing gradient is not more than 1:1.5, a C20 concrete panel 3 with the thickness of 80mm is paved on the slope, a 6.5@200x200 reinforcing steel bar net (not shown in the figure) is arranged in the concrete panel 3, and phi 48 multiplied by 3.5 anchor bars 5 and phi 20 dowel bars 4 are arranged in the concrete panel 3 for slope protection.
In this embodiment, the foundation pit vertical support includes a column pile 1 and a lattice pile 2 vertically connected to the top of the column pile 1, where the top end of the lattice pile 2 is connected to the bottom of the central portion of the second channel structural beam slab 22 of the basement.
As shown in fig. 2, the concrete support 26 is fixedly connected to the junction between the top of the central portion edge of the second structural beam plate 22 of the basement and the structural column 25, the steel support 27 is riveted to the side of the top beam 16, one end of the diagonal cast support 28 is welded to the steel support 27, and the other end is riveted to the concrete support 26 through an anchor plate.
And a main rib 17 is reserved at the end construction joint of the central part of the second structural beam slab 22 of the basement, so that the second structural beam slab is conveniently connected with the main structural rib of the second structural beam slab of the peripheral area of the later construction.
And a construction operation space with the construction joint distance of more than or equal to 1m from the slope bottom is reserved on the second-channel structural beam plate 22 of the basement.
The construction method of the deep foundation pit supporting system comprises the following specific steps:
s1: as shown in fig. 1, constructing a foundation pit enclosure structure, wherein vertical column piles 1 and lattice piles 2 (i.e. one column and one pile) which are vertically connected are adopted as vertical supports in a foundation pit, a layer of soil body in the ground is divided into a central island area and a peripheral area enclosed outside the central island area, the central island area is constructed in advance by adopting forward construction, a dot-dash line marking area in fig. 1 is a central island area, the soil body in the central island area is excavated to the position below the elevation of a second structural beam slab 22 of the basement, the central part of the second structural beam slab 22 of the basement is poured, as shown in fig. 2, part of the lattice piles 2 which influence the construction of the second structural beam slab 22 and the structural columns 25 of the basement, namely part of the lattice piles 2 which are filled by dotted line frame lines and oblique lines in fig. 2, is cut off, so that the top of the lattice piles 2 are positioned at the bottom of the second structural beam slab 22 of the basement;
s2: as shown in fig. 2, a plurality of diagonal throws 28 are arranged at intervals between the top beam 16 and the central part of the second structural beam plate 22 of the basement, and part of lattice piles 2 influencing the arrangement of the diagonal throws 28 are cut off;
s3: as shown in fig. 3, the soil slope is reserved in the peripheral area of the foundation pit, the second-channel structural beam slab 22 of the basement is continuously poured and constructed, after the second-channel structural beam slab 22 of the basement reaches the strength required by design, the diagonal cast support 28 is removed, the first-layer structure and the upper-layer structures of the first-layer structure are constructed by adopting a forward method, soil below the second-channel structural beam slab 22 of the basement is synchronously excavated, and the underground structures such as the second-layer structure, the third-layer structure and the like are sequentially constructed by adopting a reverse method.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure are intended to fall within the scope of the claims.
Claims (5)
1. The deep foundation pit supporting system is characterized in that: the foundation pit vertical support is positioned at the bottom of the central part of the second structural beam plate of the basement and fixedly connected with the same, a plurality of inclined throwing supports are arranged between the foundation pit support structure and the central part of the second structural beam plate of the basement at intervals, one end of each inclined throwing support is fixedly connected to the top end of the foundation pit support structure, the other end of each inclined throwing support is fixedly connected to the top of the edge of the central part of the second structural beam plate of the basement, and the foundation pit support structure, the inclined throwing supports, the foundation pit vertical supports and the central part of the second structural beam plate of the basement are mutually connected to form a supporting structure stress system.
2. The deep foundation pit support system of claim 1, wherein: the foundation pit enclosure structure comprises an underground continuous wall, triaxial cement mixing piles, large-diameter high-pressure jet grouting piles, concrete guide walls and a top beam, wherein the triaxial cement mixing piles are respectively arranged on two sides of a groove section where the underground continuous wall is located, the large-diameter high-pressure jet grouting piles are arranged at joints of the underground continuous wall, the L-shaped integral casting type concrete guide walls are arranged at the tops of the triaxial cement mixing piles on the outer side, one end of each concrete guide wall is arranged on the inner side of each triaxial cement mixing pile, the other end of each concrete guide wall is arranged at the tops of the triaxial cement mixing piles, the top beam is arranged at the tops of the underground continuous wall, and reserved main ribs are arranged on the top beam.
3. The deep foundation pit support system of claim 2, wherein: the concrete support is fixedly connected to the joint between the top of the edge of the central part of the beam slab of the second channel of the basement and the structural column of the basement, the steel support is riveted on the side surface of the top beam, one end of the inclined throwing support is welded on the steel support, and the other end of the inclined throwing support is riveted on the concrete support through an anchor plate.
4. The deep foundation pit support system of claim 1, wherein: the foundation pit vertical support comprises upright posts and lattice piles vertically connected to the tops of the upright posts, and the tops of the lattice piles are connected to the bottom of the central part of the second structural beam plate of the basement.
5. The deep foundation pit support system of claim 1, wherein: and a reserved main rib is arranged at the end part of the central part of the beam slab of the second channel structure of the basement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310197342.6A CN116180757A (en) | 2023-03-02 | 2023-03-02 | Deep foundation pit supporting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310197342.6A CN116180757A (en) | 2023-03-02 | 2023-03-02 | Deep foundation pit supporting system |
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| CN116180757A true CN116180757A (en) | 2023-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310197342.6A Pending CN116180757A (en) | 2023-03-02 | 2023-03-02 | Deep foundation pit supporting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118128061A (en) * | 2024-05-06 | 2024-06-04 | 北京城建集团有限责任公司 | Super-high reverse-acting layer inclined support system and construction method thereof |
-
2023
- 2023-03-02 CN CN202310197342.6A patent/CN116180757A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118128061A (en) * | 2024-05-06 | 2024-06-04 | 北京城建集团有限责任公司 | Super-high reverse-acting layer inclined support system and construction method thereof |
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