CN109113070B - Building foundation pit internal and external support structure and construction method - Google Patents
Building foundation pit internal and external support structure and construction method Download PDFInfo
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- CN109113070B CN109113070B CN201810973638.1A CN201810973638A CN109113070B CN 109113070 B CN109113070 B CN 109113070B CN 201810973638 A CN201810973638 A CN 201810973638A CN 109113070 B CN109113070 B CN 109113070B
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- rod
- foundation pit
- support frame
- anchor
- 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
- Foundations (AREA)
Abstract
The invention provides an internal and external support structure of a building foundation pit, which comprises a plurality of anchor rods, wherein one ends of the anchor rods are fixed in a rock-soil body, and the other ends of the anchor rods are fixed on an H-shaped support frame; the anchor rods are divided into two rows, and the two rows of anchor rods and the rock-soil body are arranged in an isosceles triangle; the upper part and the middle part of the H-shaped support frame are respectively fixedly connected with a supporting pile arranged on a rock-soil body through an upper pressure rod and a lower pressure rod; the H-shaped support frame is also connected with the support pile through a support rod; it has solved the excavation supporting construction of present stage and can not repeatedly dismantle the utilization, has wasted resource utilization to a certain extent, is unfavorable for construction cost's saving problem, and its structure is built fast, construction period is short, and effective protection device reduces the stock quantity, saves raw and other materials and reduces engineering cost.
Description
Technical Field
The invention relates to the field of foundation pit support, in particular to an internal and external support structure of a building foundation pit and a construction method.
Background
When the building foundation pit is constructed, in order to ensure the construction safety and prevent the occurrence of collapse accidents, support measures must be taken for the excavated building foundation pit. The design and construction of the building foundation pit support comprehensively consider the unique requirements of engineering geology and hydrogeology conditions, the type of the foundation pit, the excavation depth of the foundation pit, dewatering and drainage conditions and the surrounding environment on the side wall of the foundation pit, the factors of the surrounding load of the foundation pit, the service life of the support structure and the like, and the design and the elaborate construction are needed to be reasonably carried out. At present, the internal support structure of deep foundation pits at home and abroad generally adopts two structural forms: in the support of a building foundation pit, the support is generally divided into an anchor rod, an anchor-pull type support structure and a support structure which is arranged in the foundation pit and is composed of reinforced concrete or steel components.
The anchor rods are usually connected at one end to a supporting structural member and anchored at the other end in a stable ground body. The pull rod piece is often limited in use because the anchor rod extends into the rock-soil body far, and influences and damages houses, roads and various municipal pipelines in the influence range to different degrees;
the inner support is a supporting and blocking type structure which mainly comprises a soil retaining member and the inner support; as the foundation pit is deeply and greatly developed, the inner support structure is complex in type, the support members and the connection requirements thereof are high, the manufacturing cost is high, the construction period is long, and the construction is complex. A number of difficulties are created in the design and construction of the inner support.
Although these two kinds of bearing structure can both play certain supporting role, can not repeatedly dismantle the utilization, wasted resource utilization to a certain extent, be unfavorable for construction cost's saving.
Disclosure of Invention
The invention provides an internal and external supporting structure of a building foundation pit, which solves the problems that the supporting structure of the foundation pit at the present stage can not be repeatedly disassembled and utilized, the resource utilization rate is wasted to a certain extent, and the saving of the construction cost is not facilitated; in addition, the anchor pulling type retaining structure and the supporting type retaining structure are combined to form a combined supporting structure system, the combined supporting structure system is suitable for deeper foundation pit engineering, the elastic supporting points of the retaining structure are increased, the axial tension of the anchor rod and the axial pressure value of the inner support are improved, and the foundation pit engineering quality and the foundation pit use safety are effectively guaranteed.
The technical scheme adopted by the invention for solving the technical problems is as follows: the inner and outer supporting structure of the building foundation pit comprises a plurality of anchor rods, wherein one ends of the anchor rods are fixed in a rock body, and the other ends of the anchor rods are fixed on an H-shaped supporting frame; the anchor rods are divided into two rows, and the two rows of anchor rods and the rock-soil body are arranged in an isosceles triangle; the upper part and the middle part of the H-shaped support frame are respectively fixedly connected with a supporting pile arranged on a rock-soil body through an upper pressure rod and a lower pressure rod; the upper part and the middle part of the support pile are respectively provided with a crown beam and a waist beam; the upper pressure rod and the lower pressure rod are respectively fixedly connected with the crown beam and the waist beam; the H-shaped support frame is also connected with the support pile through a support rod.
Preferably, the construction method of the inner and outer support structures of the building foundation pit comprises the following steps:
the method comprises the following steps: leveling the field and paying off and arranging points: positioning and paying off according to design requirements, and determining the positions of the support piles and the anchor rods and the side line of the foundation pit;
secondly, calculating and determining an inclination angle α of the anchor rod, and firstly performing punching construction according to the construction sequence of the anchor rod;
step three: manufacturing and installing a rod body: manufacturing an anchor rod body according to design requirements, and inserting the rod body and grouting in time after hole forming;
step four: calculating and determining the lengths of the upper pressure rod and the lower pressure rod according to the inclination angle of the anchor rod and the requirements of the H-shaped support frame, and manufacturing the upper pressure rod, the lower pressure rod and the support rod;
step five: excavating an upper foundation pit and ensuring the construction and installation position of the H-shaped support frame according to the position of the H-shaped support frame in the foundation pit;
step six: welding and fixing the H-shaped support frame and the crown beam and the waist beam of the support pile by using an upper pressure rod and a lower pressure rod in sequence;
step seven: locking the anchor rod on the H-shaped support frame;
step eight: the H-shaped support frame and the support pile are welded firmly by the support rod;
step nine: and finishing the construction of the inner and outer combined support of the building foundation pit.
The invention provides an internal and external support structure of a building foundation pit, which has the advantages of quick structure building and short construction period, and because anchor rods and rock-soil bodies are not vertically inserted, the range of the anchor rods disturbing soil layers is reduced, the pressure of rock bodies on the anchor rods is also reduced, and the building combination of upper and lower rows of anchor rods and an H-shaped support frame achieves the supporting and supporting effects between the anchor rods and a supporting pile, so that a device is effectively protected, the use amount of the anchor rods is reduced, raw materials are saved, and the construction cost is reduced; in addition, the anchor pulling type retaining structure and the supporting type retaining structure are combined to form a combined supporting structure system, the combined supporting structure system is suitable for deeper foundation pit engineering, the elastic supporting points of the retaining structure are increased, the axial tension of the anchor rod and the axial pressure value of the inner support are improved, and the foundation pit engineering quality and the foundation pit use safety are effectively guaranteed.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Description of reference numerals: 1-rock-soil mass, 2-crown beam, 3-upper pressure bar, 4-H-shaped support frame, 5-anchor rod, 6-support pile, 7-waist beam, 8-lower pressure bar and 9-support bar.
Detailed Description
An embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the embodiment.
As shown in fig. 1, an embodiment of the present invention provides an internal and external support structure of a building foundation pit, including a plurality of anchor rods 5, wherein one end of each of the plurality of anchor rods 5 is fixed in a rock-soil body 1, and the other end is fixed on an H-shaped support frame 4; the anchor rods 5 are divided into two rows, and the two rows of anchor rods 5 and the rock-soil body 1 are arranged in an isosceles triangle; the upper part and the middle part of the H-shaped support frame 4 are respectively fixedly connected with a support pile 6 arranged on the rock-soil body 1 through an upper pressure rod 3 and a lower pressure rod 8; the upper part and the middle part of the support pile 6 are respectively provided with a crown beam 2 and a waist beam 7; the upper pressure lever 3 and the lower pressure lever 8 are respectively fixedly connected with the crown beam 2 and the waist beam 7; the H-shaped support frame 4 is also connected with a support pile 6 through a support rod 9.
Preferably, the construction method of the inner and outer support structures of the building foundation pit comprises the following steps:
the method comprises the following steps: leveling the field and paying off and arranging points: positioning and paying off according to design requirements, and determining the positions of the support piles 6 and the anchor rods 5 and the side line of the foundation pit;
secondly, calculating and determining an inclination angle α of the anchor rod 5, and firstly performing punching construction according to the construction sequence of the anchor rod 5;
step three: manufacturing and installing a rod body: manufacturing a rod body of the anchor rod 5 according to design requirements, and inserting the rod body and grouting in time after hole forming;
step four: calculating and determining the lengths of the upper pressure rod 3 and the lower pressure rod 8 according to the inclination angle of the anchor rod 5 and the requirements of the H-shaped support frame 4, and manufacturing the upper pressure rod 3, the lower pressure rod 8 and the support rod 9;
step five: excavating an upper foundation pit and ensuring the construction and installation position of the H-shaped support frame 4 according to the position of the H-shaped support frame 4 in the foundation pit;
step six: welding and fixing the H-shaped support frame 4 and the crown beam 2 and the waist beam 7 of the support pile 6 by using an upper pressure rod 3 and a lower pressure rod 8 in sequence;
step seven: locking the anchor rod 5 on the H-shaped support frame 4;
step eight: the H-shaped support frame 4 and the support piles 6 are firmly welded by the support rods 9;
step nine: and finishing the construction of the inner and outer combined support of the building foundation pit.
The structure is built quickly, the construction period is short, and the anchor rods and the rock-soil body are not inserted vertically, so that the range of the anchor rods disturbing the soil layer is reduced, the pressure of the rock body on the anchor rods is reduced, the upper and lower rows of anchor rods are combined with the H-shaped support frame in a building way, the supporting and supporting effects on supporting piles are achieved, the device is effectively protected, the using amount of the anchor rods is reduced, raw materials are saved, and the construction cost is reduced; in addition, the anchor pulling type retaining structure and the supporting type retaining structure are combined to form a combined supporting structure system, the combined supporting structure system is suitable for deeper foundation pit engineering, the elastic supporting points of the retaining structure are increased, the axial tension of the anchor rod and the axial pressure value of the inner support are improved, and the foundation pit engineering quality and the foundation pit use safety are effectively guaranteed.
The above disclosure is only for the specific embodiment of the present invention, but the embodiment of the present invention is not limited thereto, and any variations that can be made by those skilled in the art should fall within the scope of the present invention.
Claims (2)
1. The inner and outer supporting structure of the building foundation pit comprises a plurality of anchor rods (5), and is characterized in that one ends of the anchor rods (5) are fixed in a rock-soil body (1), and the other ends of the anchor rods are fixed on an H-shaped supporting frame (4); the anchor rods (5) are divided into two rows, and the two rows of anchor rods (5) and the rock-soil body (1) are arranged in an isosceles triangle; the upper part and the middle part of the H-shaped support frame (4) are respectively fixedly connected with a support pile (6) arranged on the rock-soil body (1) through an upper pressure rod (3) and a lower pressure rod (8); the upper part and the middle part of the support pile (6) are respectively provided with a crown beam (2) and a waist beam (7); the upper pressure lever (3) and the lower pressure lever (8) are respectively fixedly connected with the crown beam (2) and the waist beam (7); the H-shaped support frame (4) is also connected with the support piles (6) through support rods (9).
2. The construction method for the internal and external support structures of the building foundation pit according to claim 1, characterized by comprising the following steps:
the method comprises the following steps: leveling the field and paying off and arranging points: positioning and paying off are carried out according to design requirements, and the positions of the support piles (6) and the anchor rods (5) and the side line of the foundation pit are determined;
secondly, calculating and determining an inclination angle α of the anchor rod (5), and punching according to the construction sequence of the anchor rod (5);
step three: manufacturing and installing a rod body: manufacturing a rod body of the anchor rod (5) according to design requirements, and inserting the rod body and grouting in time after hole forming;
step four: calculating and determining the lengths of the upper pressure lever (3) and the lower pressure lever (8) according to the inclination angle of the anchor rod (5) and the requirements of the H-shaped support frame (4), and manufacturing the upper pressure lever (3), the lower pressure lever (8) and the support rod (9);
step five: excavating an upper foundation pit according to the position of the H-shaped support frame (4) in the foundation pit and ensuring the construction and installation position of the H-shaped support frame (4);
step six: an upper pressure lever (3) and a lower pressure lever (8) are used for welding and fixing the H-shaped support frame (4) and the crown beam (2) and the waist beam (7) of the support pile (6) in sequence;
step seven: locking the anchor rod (5) on the H-shaped support frame (4);
step eight: the H-shaped support frame (4) and the support piles (6) are welded firmly by the support rods (9);
step nine: and finishing the construction of the inner and outer combined support of the building foundation pit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810973638.1A CN109113070B (en) | 2018-08-24 | 2018-08-24 | Building foundation pit internal and external support structure and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810973638.1A CN109113070B (en) | 2018-08-24 | 2018-08-24 | Building foundation pit internal and external support structure and construction method |
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| Publication Number | Publication Date |
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| CN109113070A CN109113070A (en) | 2019-01-01 |
| CN109113070B true CN109113070B (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810973638.1A Expired - Fee Related CN109113070B (en) | 2018-08-24 | 2018-08-24 | Building foundation pit internal and external support structure and construction method |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3505213B2 (en) * | 1994-03-15 | 2004-03-08 | 戸田建設株式会社 | Construction method of diagonally cut beam |
| CN101255697B (en) * | 2008-04-10 | 2010-07-28 | 王平 | Deep building pit trussed-beam inner support integral application pre-stress method |
| CN203034464U (en) * | 2012-12-17 | 2013-07-03 | 广东省基础工程公司 | Truss type foundation pit supporting structure |
| CN103452121A (en) * | 2013-08-26 | 2013-12-18 | 中冶集团武汉勘察研究院有限公司 | Long pile and short pile combined single-row pile and horizontal internal support pile supporting structure and construction method thereof |
| CN105862878B (en) * | 2016-05-30 | 2018-01-09 | 建研地基基础工程有限责任公司 | A kind of support system of deep basal pit |
| CN106245657B (en) * | 2016-08-25 | 2018-12-18 | 安徽省城建设计研究总院股份有限公司 | A kind of purlin anchor support construction for pattern foundation pit supporting structure |
| CN107476316B (en) * | 2017-09-20 | 2022-12-13 | 中恒建设集团有限公司 | Building foundation pit internal and external support structure and construction method |
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Effective date of registration: 20211112 Address after: 471000 Wangcheng Park, University Science Park, Luoyang Institute of technology, No. 90, Wangcheng Avenue, Luolong District, Luoyang City, Henan Province fs504 Patentee after: Henan mengsen Construction Engineering Service Co.,Ltd. Address before: 471000 No. 90, Wangcheng Avenue, Luolong District, Luoyang City, Henan Province Patentee before: LUOYANG INSTITUTE OF SCIENCE AND TECHNOLOGY |
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Granted publication date: 20200428 |