CN108316670B - Steel pipe underpinning construction method under existing building foundation - Google Patents
Steel pipe underpinning construction method under existing building foundation Download PDFInfo
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- CN108316670B CN108316670B CN201810137988.4A CN201810137988A CN108316670B CN 108316670 B CN108316670 B CN 108316670B CN 201810137988 A CN201810137988 A CN 201810137988A CN 108316670 B CN108316670 B CN 108316670B
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- underpinning
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/06—Separating, lifting, removing of buildings; Making a new sub-structure
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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
- E02D27/48—Foundations inserted underneath existing buildings or constructions
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a steel pipe underpinning construction method under the foundation of an existing building, wherein a drilling machine punches a double-wall drill rod through foundation soil to the other side of the building on a working surface at one side of a building to be underpinned, and removes an inner drill rod; taking down the drill bit of the outer wall pipe, and locking the steel pipe with the same diameter as the outer wall pipe to be underpinned into the soil body with the connector and the outer wall pipe of the drilling machine; the drilling machine pulls back the outer wall pipe to drive the underpinning steel pipes to be dragged together, and simultaneously the outer wall pipe is disassembled section by section on the working side of the drilling machine until the underpinning steel pipes are completely dragged into the preset foundation soil; finishing underpinning steel pipe construction one by one in sequence; and a steel reinforcement cage can be arranged in the underpinning steel pipe, and cement mortar or cement mortar can be poured to increase the rigidity of the underpinning steel pipe. The construction method and the process are simple, the disturbance on the construction of the foundation soil of the building is very small, the risk of hole collapse is avoided, underpinning construction can be performed in a short distance under the foundation of the building, operation can be performed in a narrow construction space, and construction which cannot be realized by the traditional construction method is met.
Description
Technical Field
The invention relates to a steel pipe underpinning construction method under the foundation of an existing building foundation, belonging to the field of foundation reinforcement of the existing building foundation.
Background
Along with the rapid development of national economy in China, the urban construction scale and underground space development are continuously expanded, and in recent years, foundation underpinning and reinforcing projects for existing buildings, particularly existing old houses and historical relic buildings needing protection are increasingly increased.
In most cases, existing old houses and historical relic buildings have the characteristics of long construction age, fragile structural form and the like, and when underpinning construction is carried out under the foundation, great disturbance cannot be generated on foundation soil and upper structures, and foundation soil collapse cannot be caused. For some special stratum conditions and construction operation conditions, for example, the foundation soil is sandy gravel, silt, soft soil, filling soil and the like, underground water is abundant, underpinning construction is performed at a short distance under the foundation, the construction space operation is narrow, and the traditional pipe shed construction method is difficult to apply, so that a new construction method is needed to realize the steel pipe underpinning construction under the certain special stratum conditions and the construction operation conditions.
Disclosure of Invention
The invention aims to provide a steel pipe underpinning construction method under the existing building foundation, which has the advantages of convenience in operation, low manufacturing cost, safety, reliability, high quality and the like, so that the large disturbance of the construction on the foundation soil and the upper structure is avoided, the foundation soil collapse and the building are subjected to large settlement and even cracking, the limitation of the operation space is overcome, the construction progress is accelerated, the construction quality is finally ensured, the construction cost is reduced, and the maximum benefit is created.
In order to achieve the aim, the invention provides a steel pipe underpinning construction method under the existing building foundation, which comprises the following steps:
firstly, excavating two sides of a building to be underpinned to a designed elevation below a foundation, leveling the field, and ensuring that a drilling machine can normally walk and work;
driving the drilling machine into a working site on one side of the building, namely a working side, horizontally drilling a double-wall drill rod of the drilling machine into foundation soil below the foundation of the building to be underpinned, penetrating the double-wall drill rod into a working surface on the other side of the building to be underpinned, and removing an inner drill rod of the drilling machine;
taking down the drill bit of the outer wall pipe of the drilling machine, and locking the underpinned steel pipe to be underpinned into the soil body with the outer wall pipe of the drilling machine by adopting a connector;
and fourthly, starting the drilling machine, pulling back the outer wall pipe of the drilling machine, dragging the underpinning steel pipes together, entering foundation soil under the foundation of the building to be underpinned, rotating and vibrating the outer wall pipe of the drilling machine to pull back when the resistance of the foundation soil is large, and unloading the outer wall pipe section by section on the working side of the drilling machine until the underpinning steel pipes are completely dragged into the preset foundation soil.
And fifthly, arranging a reinforcement cage in the underpinning steel pipe, and pouring cement paste or cement mortar to increase the rigidity of the underpinning steel pipe.
And step six, repeating the step one to the step five, finishing the construction of the underpinning steel pipes one by one in sequence, forming the underpinning steel pipes which are tightly connected into a row in the foundation soil under the foundation of the underpinning building, fixing the two ends of the underpinning steel pipes on the underpinning beams at the two sides of the underpinning building, fixing the underpinning beams on the vertical underpinning columns or piles, supporting the underpinning building, and ensuring the stability of the underpinning building.
And seventhly, carrying out earth excavation of the underground space under the underpinning structure and construction of the underground structure.
In a preferable construction method, in the step two, the double-wall drill pipe is used for drilling, the circulating liquid is input by the inner drill pipe, and slag is discharged between the inner drill pipe and the outer wall pipe.
In a preferred construction method, the diameter of the steel pipe to be replaced into the foundation soil in the third step must be smaller than or equal to the diameter of the outer wall pipe of the drilling machine, so that the fourth step can be carried out smoothly.
In a preferable construction method, the connector in the third step is in threaded connection with the outer wall pipe of the drilling machine, and is in pin joint, welding or threaded connection with the underpinning steel pipe.
In a preferred construction method, the underpinned steel pipe in the fourth step is a complete steel pipe meeting the underpinning length, or short steel pipes are adopted to be welded to the underpinning length section by section.
In a preferable construction method, the fifth step is to determine whether the underpinned steel pipe needs to be internally provided with a steel reinforcement cage or be filled with cement mortar or not according to the underpinning design requirements so as to increase the rigidity of the underpinned steel pipe.
In a preferable construction method, in the sixth step, the joist is a reinforced concrete beam or a section steel beam, the side-by-side underpinning steel pipes are fixed, and the joist is fixed on the vertical underpinning column or pile to support the building to be underpinned, so as to ensure the stability of the building to be underpinned.
The construction method and the process are simple, the disturbance on the construction of the foundation soil of the building is very small, the risk of hole collapse is avoided, underpinning construction can be performed in a short distance under the foundation of the building, operation can be performed in a narrow construction space, and construction which cannot be realized by the traditional construction method is met.
Drawings
FIG. 1 is a flow chart of the present invention.
FIG. 2 is a schematic cross-sectional view of the construction of underpinning steel pipes.
FIG. 3 is a schematic cross-sectional view of the underpinning process.
Detailed Description
The present invention is further illustrated by the following specific examples.
As shown in the attached figure 1, the invention discloses a steel pipe underpinning construction method for the foundation of an existing building foundation, which comprises the following steps: excavating two sides of the building to a designed elevation below the foundation, and leveling the field; the drilling machine drives into a working site (working side) on one side of the building, drills the double-wall drill rod into foundation soil under the foundation of the building according to a design angle, and punches through the working surface on the other side of the building, and removes the inner drill rod part; taking down the drill bit of the outer wall pipe, and locking the underpinned steel pipe to be underpinned into the soil body with the outer wall pipe by adopting a connector; starting a drilling machine, pulling back the outer wall pipe, dragging the underpinning steel pipes together, and entering foundation soil, wherein when the foundation soil resistance is large, the outer wall pipe can be rotated and vibrated to pull back, and the outer wall pipe is unloaded section by section on the working side of the drilling machine until the underpinning steel pipes are completely dragged into the preset foundation soil; a steel reinforcement cage can be arranged in the underpinning steel pipe, and cement mortar or cement mortar can be poured to increase the rigidity of the underpinning steel pipe with equal diameter. As shown in fig. 2.
The construction of the underpinning steel pipes is completed sequentially one by one, so that underpinning steel pipes which are tightly connected into a row are formed in foundation soil under a building foundation, two ends of each underpinning steel pipe are fixed on the supporting beams on two sides of the building, the supporting beams are fixed on the vertical underpinning columns (piles) to support the building, and the stability of the building is ensured; and carrying out earth excavation and underground structure construction of underground space under the underpinning structure. As shown in fig. 3.
The diameter of the underpinning steel pipe must be equal to or less than the diameter of the outer wall pipe of the drilling machine. The connector is in threaded connection with the outer wall pipe of the drilling machine, can be in pin joint, welding or threaded connection with the underpinning steel pipe, and is convenient to detach. The underpinning steel pipe is a complete steel pipe which meets the underpinning length, short steel pipes can be adopted to be welded to the underpinning length section by section, and the wall thickness needs to meet the underpinning load requirement. When the double-wall drill rod drills, circulating liquid is input by the inner drill rod, and slag is discharged between the inner drill rod and the outer wall pipe. And determining whether the underpinned steel pipe needs to be internally provided with a steel reinforcement cage or be filled with cement mortar or not according to the underpinning design requirement.
The foregoing is an exemplary embodiment of the present invention, and the practice of the present invention is not limited thereto.
Claims (6)
1. A steel pipe underpinning construction method under the existing building foundation is characterized in that: the method comprises the following steps:
firstly, excavating two sides of a building to be underpinned to a designed elevation below a foundation, leveling the field, and ensuring that a drilling machine can normally walk and work;
driving the drilling machine into a working site on one side of the building, namely a working side, horizontally drilling a double-wall drill rod of the drilling machine into foundation soil below the foundation of the building to be underpinned, penetrating the double-wall drill rod into a working surface on the other side of the building to be underpinned, and removing an inner drill rod of the drilling machine;
taking down the drill bit of the outer wall pipe of the drilling machine, and locking the underpinned steel pipe to be underpinned into the soil body with the outer wall pipe of the drilling machine by adopting a connector;
fourthly, starting the drilling machine, pulling back the outer wall pipe of the drilling machine, dragging the underpinning steel pipes together, entering foundation soil under the foundation of the building to be underpinned, rotating and vibrating the outer wall pipe of the drilling machine to pull back when the resistance of the foundation soil is large, and unloading the outer wall pipe section by section on the working side of the drilling machine until the underpinning steel pipes are completely dragged into the preset foundation soil;
step five, arranging a reinforcement cage in the underpinning steel pipe, and pouring cement paste or cement mortar to increase the rigidity of the underpinning steel pipe;
step six, repeating the step one to the step five, completing the construction of the underpinning steel pipes one by one in sequence, forming the underpinning steel pipes which are tightly connected into a row in the foundation soil under the foundation of the underpinning building, fixing the two ends of the underpinning steel pipes on the underpinning beams at the two sides of the underpinning building, fixing the underpinning beams on the vertical underpinning columns or piles, supporting the underpinning building, and ensuring the stability of the underpinning building;
seventhly, carrying out earth excavation and underground structure construction of an underground space under the underpinning structure;
in the sixth step, the joists are reinforced concrete beams or section steel beams, the parallel underpinning steel pipes are fixed, and the joists are fixed on the vertical underpinning columns or piles to support the building to be underpinned, so that the stability of the building to be underpinned is ensured.
2. The underpinning construction method for the steel pipe under the foundation of the existing building foundation as claimed in claim 1, which is characterized in that: and in the second step, the double-wall drill rod is used for drilling, the circulating liquid is input by adopting the inner drill rod, and slag is discharged between the inner drill rod and the outer wall pipe.
3. The underpinning construction method for the steel pipe under the foundation of the existing building foundation as claimed in claim 1, which is characterized in that: in the third step, the diameter of the steel pipe to be replaced into the foundation soil must be less than or equal to the diameter of the outer wall pipe of the drilling machine, so that the smooth operation of the fourth step can be ensured.
4. The underpinning construction method for the steel pipe under the foundation of the existing building foundation as claimed in claim 1, which is characterized in that: and the connector in the third step is in threaded connection with the outer wall pipe of the drilling machine and is in pin joint, welding or threaded connection with the underpinning steel pipe.
5. The underpinning construction method for the steel pipe under the foundation of the existing building foundation as claimed in claim 1, which is characterized in that: in the fourth step, the underpinning steel pipe is a complete steel pipe meeting the underpinning length, or short steel pipes are adopted to be welded to the underpinning length section by section.
6. The underpinning construction method for the steel pipe under the foundation of the existing building foundation as claimed in claim 1, which is characterized in that: and step five, determining whether the underpinned steel pipe needs to be internally provided with a steel reinforcement cage and filled with cement mortar or cement mortar according to underpinning design requirements so as to increase the rigidity of the underpinned steel pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810137988.4A CN108316670B (en) | 2018-02-10 | 2018-02-10 | Steel pipe underpinning construction method under existing building foundation |
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| CN201810137988.4A CN108316670B (en) | 2018-02-10 | 2018-02-10 | Steel pipe underpinning construction method under existing building foundation |
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| CN108316670A CN108316670A (en) | 2018-07-24 |
| CN108316670B true CN108316670B (en) | 2020-01-10 |
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| CN111456080A (en) * | 2020-03-12 | 2020-07-28 | 浙江大学城市学院 | Steel pipe underpinning construction method under existing building foundation |
| CN111335670A (en) * | 2020-03-18 | 2020-06-26 | 同济大学建筑设计研究院(集团)有限公司 | Method for constructing foundation pit and newly adding underground structure in situ under existing reserved building |
| CN113294010A (en) * | 2021-06-09 | 2021-08-24 | 广州市鲁班建筑科技集团股份有限公司 | Structure for separating bottom of ancient coffin chamber and construction method thereof |
| CN113323011B (en) * | 2021-06-30 | 2022-12-27 | 武汉武建机械施工有限公司 | Novel underpinning construction method for steel pipe under existing building foundation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101956466A (en) * | 2010-09-13 | 2011-01-26 | 董兰田 | Technical method for finishing vertical lifting in integral translation process of building |
| CN102127974B (en) * | 2011-04-18 | 2012-08-29 | 上海现代建筑设计(集团)有限公司 | Design and construction method of additional cellar under existing building |
| CN203856227U (en) * | 2014-03-21 | 2014-10-01 | 上海建工四建集团有限公司 | In-situ underground spatial structure of existing building |
| CN207739298U (en) * | 2017-10-13 | 2018-08-17 | 建研地基基础工程有限责任公司 | A kind of existing construction foundation basis steel pipe underpinning construction device |
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