CN112576056B - Underpinning support system for storey-adding reconstruction of existing building basement and construction method thereof - Google Patents
Underpinning support system for storey-adding reconstruction of existing building basement and construction method thereof Download PDFInfo
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- CN112576056B CN112576056B CN202011416032.1A CN202011416032A CN112576056B CN 112576056 B CN112576056 B CN 112576056B CN 202011416032 A CN202011416032 A CN 202011416032A CN 112576056 B CN112576056 B CN 112576056B
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- 238000009424 underpinning Methods 0.000 title claims abstract description 140
- 238000010276 construction Methods 0.000 title claims description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 143
- 239000010959 steel Substances 0.000 claims abstract description 143
- 230000003068 static effect Effects 0.000 claims abstract description 95
- 238000005553 drilling Methods 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000009412 basement excavation Methods 0.000 claims abstract description 17
- 230000002093 peripheral effect Effects 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims description 14
- 239000002002 slurry Substances 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 9
- 230000003416 augmentation Effects 0.000 claims description 5
- 239000004567 concrete Substances 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000011178 precast concrete Substances 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 claims 1
- 230000002706 hydrostatic effect Effects 0.000 claims 1
- 239000002893 slag Substances 0.000 claims 1
- 238000000034 method Methods 0.000 description 6
- 238000004873 anchoring Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
Classifications
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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
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
-
- 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
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0266—Enlarging
-
- 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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The underpinning support system for the storey-adding reconstruction of the basement of the existing building is characterized by comprising a reinforced original building structure, an original building foundation, an underpinning structure, a bearing platform, a lateral support member, a peripheral water stopping structure for newly-added basement excavation and a supporting structure; the support and exchange structure comprises a static pressure support and exchange pile, a static pressure support and exchange pile matched jack, a drilling steel pipe pile and a drilling steel pipe pile matched jack, wherein the static pressure support and exchange pile matched jack is positioned at the top of the static pressure support and exchange pile; the static pressure underpinning pile and the jack matched with the static pressure underpinning pile positioned at the top of the static pressure underpinning pile are connected with the reinforced original building structure and are used for underpinning the original building structure for the first time; the drilling steel pipe pile and the drilling steel pipe pile matched jack positioned at the top of the drilling steel pipe pile are connected with the downward extending part of the original building structure through the bearing platform and are used for carrying out secondary underpinning on the original building structure; the lateral support members are located between the drilled steel pipe piles or between the drilled steel pipe piles and the peripheral structure for guaranteeing lateral stability of the drilled steel pipe piles.
Description
Technical Field
The invention relates to a construction method, in particular to a underpinning support system for storey adding and reconstruction of an existing building basement and a construction method thereof.
Background
With the acceleration of the development speed of town, land resources are more and more tense, the ground space is under-supplied, and certain areas are not available. The development and utilization of the underground space provide possibility for relieving urban land shortage, improving urban environment and traffic conditions, saving energy, protecting environment and the like.
Under some established buildings, due to the change of requirements and the incompleteness considered in the planning period, basement construction or reconstruction engineering is often required, or foundation structure reinforcement is required by construction in a narrow space. The underpinning pile technology can be used for replacing the original building foundation to bear the upper building load, so that the integrity of the upper structure can be ensured. The existing pile foundation technology mostly adopts a pile driving mode or a filling pile mode, the pile driving noise is large, the environmental impact is large, and meanwhile, the stability of undisturbed soil can be influenced; the cast-in-place pile is difficult to ensure pile quality, and quality defects of various forms such as necking, mud clamping, pile breaking or excessive thick sediment easily occur, so that the structural integrity and bearing capacity of the pile body are affected, and construction supervision and quality detection with great force are required. Meanwhile, the existing mechanical equipment (such as a crawler-type drilling machine) is oversized and is generally higher than the common floor roof in height, and is difficult to enter a narrow space below a building for construction, so that the requirements of layer increasing and extension below the existing building in the current stage are difficult to meet. In addition, some buildings need to be built and expanded in layers, but during the construction period of the layers, the building above the building still needs to be used normally, and the conventional layer-adding and expanding method is difficult to meet the requirement at present.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a underpinning support system for storey-adding reconstruction of a basement of an existing building and a construction method thereof, and the method can solve the problems that the clearance below the building is insufficient, construction machinery cannot enter and the like; but also can ensure the normal use of the upper building during the construction period of underpinning and adding layers. In order to achieve the above purpose, the embodiment of the present invention adopts the following technical scheme:
The underpinning support system for the storey-adding reconstruction of the existing building basement is characterized by comprising a reinforced original building structure 1, an original building foundation 2, an underpinning structure, a bearing platform 7, a lateral support member 8, a peripheral water stopping structure 9 and a supporting structure 10 for newly-added basement excavation, wherein the underpinning structure comprises a static pressure underpinning pile 3, a static pressure underpinning pile supporting jack 4 positioned at the top of the static pressure underpinning pile, a drilling steel pipe pile 5 and a drilling steel pipe pile supporting jack 6 positioned at the top of the static pressure underpinning pile; the static pressure underpinning pile 3 and the supporting jack 4 of the static pressure underpinning pile positioned at the top of the static pressure underpinning pile are connected with the reinforced original building structure 1 and are used for primary underpinning of the original building structure 1; the drilling steel pipe pile 5 and the drilling steel pipe pile matched jack 6 positioned at the top of the drilling steel pipe pile are connected with the downward extending part of the original building structure 1 through a bearing platform 7 and are used for secondary underpinning of the original building structure 1; the lateral support members 8 are located between the drilled steel pipe piles 5 or between the drilled steel pipe piles 5 and the surrounding structure for ensuring lateral stability of the drilled steel pipe piles 5.
Further, the original building foundation 2 comprises an independent shallow foundation, a raft foundation, a beam slab foundation, a box foundation and a pile foundation.
Further, the static pressure underpinning pile 3 is a steel pile, a steel pipe pile or a precast concrete pile; the static pressure underpinning pile 3 is segmented, counterforces provided by a jack 4 matched with the top static pressure underpinning pile are pressed into the ground, and the segments are connected and fixed through welding or mechanical connection.
Further, the drill steel pipe pile 5 is segmented, the drill steel pipe pile 5 at the lowest end is rotationally implanted into the ground through a spiral drilling machine, drill bits for assisting cutting are arranged on the drill steel pipe pile 5 at the lowest end, the segments are fixedly connected through screw threads, spiral blades are arranged on the outer side of the drill steel pipe pile 5 at the anchoring section, and the pile bearing capacity is enhanced; the inner side and the periphery of the drilled steel pipe pile 5 are reinforced by cement slurry.
Furthermore, the static pressure underpinning pile supporting jack 4 and the drilling steel pipe pile supporting jack 6 are divided into an ordinary jack or a servo control jack, wherein the servo control jack can automatically adjust the oil pressure and the elongation thereof according to the monitored structural deformation condition, so that the supported original building structure 1 is kept stable.
Further, the bearing platform 7 is of a concrete structure or a steel structure; the downward extending part of the original building structure is a permanent structure or a temporary support; the bearing platform 7 firmly connects the underpinning structure with the downward extending part of the original building structure 1.
Furthermore, the lateral supporting member 8 is a section steel or a steel pipe, and the connecting node is fixed by welding or bolting to form a space stabilizing system.
Further, the peripheral water stop structure 9 and the supporting structure 10 for newly added basement excavation comprise underground continuous walls, occluding piles, steel sheet piles, cement soil stirring water stop curtains and rotary spraying water stop curtains.
Further, the method comprises the following steps:
a) The original building structure 1 is reinforced, so that the bottom layer structure has enough bearing capacity to provide downward pressure for the underpinning pile;
b) Entering from the side surface of the bottom of the original building, and partially digging out a space which meets the construction of the static pressure underpinning pile 3 below the bottom plate of the original building;
c) Constructing a static pressure underpinning pile 3 below an original building, segmenting the static pressure underpinning pile 3, wherein the length of each segment is 1-2 m, applying downward pressure through a static pressure underpinning pile matched jack 4 between the top of the static pressure underpinning pile 3 and the structure of the original building, and pressing the static pressure underpinning pile 3 into a foundation;
d) When the distance between the top of the static pressure underpinning pile 3 and the bottom of the jack 4 matched with the static pressure underpinning pile is larger than that of one section of static pressure underpinning pile 3, connecting the new section of static pressure underpinning pile 3 to the top of the lower section of static pressure underpinning pile 3, and connecting and fixing the sections through welding or mechanical connection;
e) Repeating the step d) until the design requirement of the bearing capacity of the static pressure underpinning pile 3 is met or the bearing capacity limit value of the original building structure 1 is reached, locking the jack 4 matched with the upper static pressure underpinning pile, and adding a protection cover to prevent the lateral sliding of the jack;
f) The part which is reinforced by the static pressure underpinning pile is excavated under the original building, so that the construction clearance requirement of the drilling steel pipe pile drilling machine is met;
g) The method comprises the steps of driving the drilled steel pipe piles 5 into a foundation in sections through a rotary drilling machine, connecting the sections of steel pipe piles through screw threads, and discharging dregs in the drilled steel pipe piles 5 through circulating water;
h) After the drilling steel pipe pile 5 is constructed in place, a grouting pipe is inserted into the steel pipe, cement slurry is injected into the steel pipe, and the slurry in the steel pipe is displaced and discharged; after the steel pipe is filled with cement paste, the top of the drilled steel pipe pile 5 is sealed, cement paste is continuously injected under pressure, overflows from the bottom of the steel pipe, returns to the ground along the outer side of the steel pipe, and wraps and covers the outer part of the drilled steel pipe pile 5;
i) Constructing a pile top bearing platform 7, firmly connecting the bearing platform 7 with the original building structure 1 or an extension part thereof, arranging a drilling steel pipe pile matched jack 6 between the lower part of the bearing platform 7 and the top of the drilling steel pipe pile 5, supporting the bearing platform 7 through the drilling steel pipe pile matched jack 6, and transferring the original building load to the drilling steel pipe pile 5 through the static pressure underpinning pile 3;
j) After the peripheral supporting structure of the foundation pit is completed and underground water is controlled through a waterproof curtain or precipitation, earth excavation is further carried out until the elevation of the bottom plate is designed; removing the static pressure underpinning pile 3 along with excavation, and simultaneously arranging lateral supporting members 8 to ensure the compression stability of the drilled steel pipe pile 5;
k) After the excavation is completed, constructing a basement structure upwards from a bottom plate of the newly constructed basement, and connecting the basement structure with the original building structure 1; the drilled steel pipe pile 5 is firmly connected with the newly built basement bottom plate;
And l) removing the jack 6 matched with the drilled steel pipe pile after the newly built basement structure is connected with the original building structure, and removing the redundant drilled steel pipe pile 5 to complete the storey adding reconstruction of the basement of the existing building.
Compared with the prior art, the underpinning support system for the storey addition transformation of the existing building basement and the construction method thereof have the following advantages:
The underpinning support system for the storey-adding reconstruction of the existing building basement and the construction method thereof are characterized by comprising a reinforced original building structure 1, an original building foundation 2, an underpinning structure, a bearing platform 7, a lateral support member 8, a peripheral water stop structure 9 and a support structure 10 for newly increasing the excavation of the basement, wherein the underpinning structure comprises a static pressure underpinning pile 3, a static pressure underpinning pile matched jack 4 positioned at the top of the static pressure underpinning pile, a drilling steel pipe pile 5 and a drilling steel pipe pile matched jack 6 positioned at the top of the static pressure underpinning pile; the static pressure underpinning pile 3 and the supporting jack 4 of the static pressure underpinning pile positioned at the top of the static pressure underpinning pile are connected with the reinforced original building structure 1 and are used for primary underpinning of the original building structure 1; the drilling steel pipe pile 5 and the drilling steel pipe pile matched jack 6 positioned at the top of the drilling steel pipe pile are connected with the downward extending part of the original building structure 1 through a bearing platform 7 and are used for secondary underpinning of the original building structure 1; the lateral support members 8 are located between the drilled steel pipe piles 5 or between the drilled steel pipe piles 5 and the surrounding structure for ensuring lateral stability of the drilled steel pipe piles 5.
The invention has the advantages that the invention can provide a underpinning support system for the storey-adding reconstruction of the basement of the existing building and a construction method thereof, and small construction equipment is adopted in the construction, so that underpinning construction can be carried out in the underground space with insufficient clearance, and the problems that the underground space has insufficient clearance and the conventional method cannot be used for construction are solved; and the construction can be carried out, the normal use of the building above the building can be ensured, the construction is safe, and the influence on the environment is small.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a front view of a underpinning support system for use in the added floor reconstruction of an existing building basement in accordance with an embodiment of the present invention;
fig. 2 is an elevation view of a pile top structure of a drilled steel pipe pile for a underpinning support system for floor augmentation reconstruction of an existing building basement according to an embodiment of the present invention.
1. An original building structure; 2. an original building foundation; 3. static pressure underpinning pile; 4. a jack matched with the static pressure underpinning pile; 5. drilling a steel pipe pile; 6. jack matched with the drilling steel pipe pile; 7. bearing platform; 8. a lateral support member; 9. a water stopping structure; 10. a support structure; 11. a steel backing plate; 12. concrete anchors.
Detailed Description
In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
1-2, A underpinning support system for storey-adding reconstruction of an existing building basement is characterized by comprising a reinforced original building structure 1, an original building foundation 2, an underpinning structure, a bearing platform 7, lateral support members 8, a peripheral water stop structure 9 and a supporting structure 10 for newly increasing basement excavation, wherein the underpinning structure comprises a static pressure underpinning pile 3, a static pressure underpinning pile matched jack 4 positioned at the top of the static pressure underpinning pile, a drilling steel pipe pile 5 and a drilling steel pipe pile matched jack 6 positioned at the top of the static pressure underpinning pile; the support system is used for storey-adding reconstruction underpinning when the basement space is not enough and construction machinery cannot enter, the static pressure underpinning pile 3 and the static pressure underpinning pile matched jack 4 positioned at the top of the static pressure underpinning pile are connected with the reinforced original building structure 1 and are used for underpinning the original building structure 1 for the first time; the drilling steel pipe pile 5 and the drilling steel pipe pile matched jack 6 positioned at the top of the drilling steel pipe pile are connected with the downward extending part of the original building structure 1 through a bearing platform 7 and are used for secondary underpinning of the original building structure 1; the lateral support members 8 are located between the drilled steel pipe piles 5 or between the drilled steel pipe piles 5 and the surrounding structure for ensuring lateral stability of the drilled steel pipe piles 5.
Further, the original building foundation 2 comprises an independent shallow foundation, a raft foundation, a beam slab foundation, a box foundation and a pile foundation.
Further, the static pressure underpinning pile 3 is a steel pile, a steel pipe pile or a precast concrete pile; the static pressure underpinning pile 3 is segmented, counterforces provided by a jack 4 matched with the top static pressure underpinning pile are pressed into the ground, and the segments are connected and fixed through welding or mechanical connection.
Further, the drill steel pipe pile 5 is segmented, the drill steel pipe pile 5 at the lowest end is rotationally implanted into the ground through a spiral drilling machine, drill bits for assisting cutting are arranged on the drill steel pipe pile 5 at the lowest end, the segments are fixedly connected through screw threads, spiral blades are arranged on the outer side of the drill steel pipe pile 5 at the anchoring section, and the pile bearing capacity is enhanced; the inner side and the periphery of the drilled steel pipe pile 5 are reinforced by cement slurry; wherein, set up drilling steel-pipe pile supporting jack 6 and steel backing plate 11 between drilling steel-pipe pile 5 and the bottom plate bottom of former building structure 1, steel backing plate 11 is located the top of drilling steel-pipe pile supporting jack 6 to link to each other with concrete anchor 12 on it.
Furthermore, the static pressure underpinning pile supporting jack 4 and the drilling steel pipe pile supporting jack 6 are divided into an ordinary jack or a servo control jack, wherein the servo control jack can automatically adjust the oil pressure and the elongation thereof according to the monitored structural deformation condition, so that the supported original building structure 1 is kept stable.
Further, the bearing platform 7 is of a concrete structure or a steel structure; the downward extending part of the original building structure is a permanent structure or a temporary support; the bearing platform 7 firmly connects the underpinning structure with the downward extending part of the original building structure 1.
Furthermore, the lateral supporting member 8 is a section steel or a steel pipe, and the connecting node is fixed by welding or bolting to form a space stabilizing system.
Further, the peripheral water stop structure 9 and the supporting structure 10 for newly added basement excavation comprise underground continuous walls, occluding piles, steel sheet piles, cement soil stirring water stop curtains and rotary spraying water stop curtains.
Further, the method comprises the following steps:
a) The original building structure 1 is reinforced, so that the bottom layer structure has enough bearing capacity to provide downward pressure for the underpinning pile;
b) Entering from the side surface of the bottom of the original building, and partially digging out a space which meets the construction of the static pressure underpinning pile 3 below the bottom plate of the original building;
c) Constructing a static pressure underpinning pile 3 below an original building, segmenting the static pressure underpinning pile 3, wherein the length of each segment is 1-2 m, applying downward pressure through a static pressure underpinning pile matched jack 4 between the top of the static pressure underpinning pile 3 and the structure of the original building, and pressing the static pressure underpinning pile 3 into a foundation;
d) When the distance between the top of the static pressure underpinning pile 3 and the bottom of the jack 4 matched with the static pressure underpinning pile is larger than that of one section of static pressure underpinning pile 3, connecting the new section of static pressure underpinning pile 3 to the top of the lower section of static pressure underpinning pile 3, and connecting and fixing the sections through welding or mechanical connection;
e) Repeating the step d) until the design requirement of the bearing capacity of the static pressure underpinning pile 3 is met or the bearing capacity limit value of the original building structure 1 is reached, locking the jack 4 matched with the upper static pressure underpinning pile, and adding a protection cover to prevent the lateral sliding of the jack;
f) The part which is reinforced by the static pressure underpinning pile is excavated under the original building, so that the construction clearance requirement of the drilling steel pipe pile drilling machine is met;
g) The method comprises the steps of driving the drilled steel pipe piles 5 into a foundation in sections through a rotary drilling machine, connecting the sections of steel pipe piles through screw threads, and discharging dregs in the drilled steel pipe piles 5 through circulating water;
h) After the drilling steel pipe pile 5 is constructed in place, a grouting pipe is inserted into the steel pipe, cement slurry is injected into the steel pipe, and the slurry in the steel pipe is displaced and discharged; after the steel pipe is filled with cement paste, the top of the drilled steel pipe pile 5 is sealed, cement paste is continuously injected under pressure, overflows from the bottom of the steel pipe, returns to the ground along the outer side of the steel pipe, and wraps and covers the outer part of the drilled steel pipe pile 5;
i) Constructing a pile top bearing platform 7, firmly connecting the bearing platform 7 with the original building structure 1 or an extension part thereof, arranging a drilling steel pipe pile matched jack 6 between the lower part of the bearing platform 7 and the top of the drilling steel pipe pile 5, supporting the bearing platform 7 through the drilling steel pipe pile matched jack 6, and transferring the original building load to the drilling steel pipe pile 5 through the static pressure underpinning pile 3;
j) After the peripheral supporting structure of the foundation pit is completed and underground water is controlled through a waterproof curtain or precipitation, earth excavation is further carried out until the elevation of the bottom plate is designed; removing the static pressure underpinning pile 3 along with excavation, and simultaneously arranging lateral supporting members 8 to ensure the compression stability of the drilled steel pipe pile 5;
k) After the excavation is completed, constructing a basement structure upwards from a bottom plate of the newly constructed basement, and connecting the basement structure with the original building structure 1; the drilled steel pipe pile 5 is firmly connected with the newly built basement bottom plate;
And l) removing the jack 6 matched with the drilled steel pipe pile after the newly built basement structure is connected with the original building structure, and removing the redundant drilled steel pipe pile 5 to complete the storey adding reconstruction of the basement of the existing building.
Claims (7)
1. The underpinning support system for the storey-adding reconstruction of the existing building basement is characterized by comprising a reinforced original building structure, an original building foundation, an underpinning structure, a bearing platform, a lateral support member, a peripheral water stop structure for newly-added basement excavation and a supporting structure, wherein the underpinning structure comprises a static pressure underpinning pile, a static pressure underpinning pile matched jack positioned at the top of the static pressure underpinning pile, a drilling steel pipe pile and a drilling steel pipe pile matched jack positioned at the top of the static pressure underpinning pile; the static pressure underpinning pile and the supporting jack of the static pressure underpinning pile positioned at the top of the static pressure underpinning pile are connected with the reinforced original building structure and are used for underpinning the original building structure for the first time; the drilling steel pipe pile and the drilling steel pipe pile matched jack positioned at the top of the drilling steel pipe pile are connected with the downward extending part of the original building structure through the bearing platform and are used for carrying out secondary underpinning on the original building structure; the lateral supporting members are positioned between the drilled steel pipe piles or between the drilled steel pipe piles and the peripheral structure and are used for guaranteeing the lateral stability of the drilled steel pipe piles; the static pressure underpinning pile is a steel pile, a steel pipe pile or a precast concrete pile; the static pressure underpinning pile segments are pressed into the ground by counter force provided by a jack matched with the top static pressure underpinning pile, and the segments are connected and fixed through welding or mechanical connection; the drill steel pipe pile sections are rotationally implanted into the ground through a spiral drilling machine, the drill bit for assisting cutting is arranged at the lowest end of the drill steel pipe pile, the sections are fixedly connected through screw threads, and spiral blades are arranged at the outer sides of the anchor section drill steel pipe piles and used for enhancing pile bearing capacity; inside of drilled steel pipe pile the perimeter is reinforced by cement slurry.
2. The underpinning support system for floor augmentation and reconstruction of an existing building basement of claim 1, wherein the original building foundation form comprises an independent shallow foundation, raft foundation, beam slab foundation, box foundation or pile foundation.
3. The underpinning support system for floor adding reconstruction of the existing building basement according to claim 1, wherein the hydrostatic underpinning pile supporting jack and the drilling steel pipe pile supporting jack are divided into a common jack or a servo control jack, wherein the servo control jack can automatically adjust the oil pressure and the elongation thereof according to the monitored structural deformation condition, so that the supported original building structure is kept stable.
4. The underpinning support system for floor augmentation and reconstruction of an existing building basement according to claim 1, wherein the bearing platform is a concrete structure or a steel structure; the downward extending part of the original building structure is a permanent structure or a temporary support; the bearing platform firmly connects the underpinning structure with the downward extending part of the original building structure.
5. The underpinning support system for floor augmentation and reconstruction of an existing building basement according to claim 1, wherein the lateral support members are steel sections or pipes, and the connection nodes are fixed by welding or bolting to form a space stabilizing system.
6. The underpinning support system for floor augmentation and reconstruction of an existing building basement according to claim 1, wherein the peripheral water stop structure and the support structure for newly-added basement excavation comprise a diaphragm wall, a snap pile, a steel sheet pile, a cement-soil stirring water stop curtain or a rotary spraying water stop curtain.
7. The underpinning construction method for the storey-adding reconstruction of the basement of the existing building is characterized by comprising the following steps of:
a) The original building structure is reinforced, so that the bottom layer structure has enough bearing capacity to provide downward pressure for the underpinning pile;
b) Entering from the side surface of the bottom of the original building, and partially excavating a space meeting the construction of the static pressure underpinning pile below the bottom plate of the original building;
c) Constructing static pressure underpinning piles below the original building, segmenting the static pressure underpinning piles, wherein the length of each segment is 1-2 m, applying downward pressure through a jack matched with the static pressure underpinning pile between the top of the static pressure underpinning pile and the structure of the original building, and pressing the static pressure underpinning pile into a foundation;
d) When the distance between the top of the static pressure underpinning pile and the bottom of the jack matched with the static pressure underpinning pile is larger than that of one section of static pressure underpinning pile, connecting the new section of static pressure underpinning pile to the top of the lower static pressure underpinning pile, and connecting and fixing the sections through welding or mechanical connection;
e) Repeating the step d) until the design requirement of the bearing capacity of the static pressure underpinning pile is met or the bearing capacity limit value of the original building structure is reached, locking an upper jack, and adding a protection cover to prevent the upper jack from sliding sideways;
f) The part which is reinforced by the static pressure underpinning pile is excavated under the original building, so that the construction clearance requirement of the drilling steel pipe pile drilling machine is met;
g) Driving the drilled steel pipe piles into the foundation in sections by a rotary drilling machine, connecting the sections of the drilled steel pipe piles by screw threads, and discharging slag soil in the drilled steel pipe piles by circulating water;
h) After the drilling steel pipe pile is constructed in place, a grouting pipe is inserted into the steel pipe, cement slurry is injected into the steel pipe, and the slurry in the steel pipe is displaced and discharged; after the steel pipe is filled with cement paste, the top of the drilled steel pipe pile is sealed, cement paste is continuously injected under pressure, overflows from the bottom of the steel pipe, returns to the ground along the outer side of the steel pipe, and wraps the outer part of the drilled steel pipe pile;
i) Constructing a pile top bearing platform, firmly connecting the bearing platform with an original building structure or an extension part thereof, arranging a drilling steel pipe pile matched jack between the lower part of the bearing platform and the drilling steel pipe pile top, supporting the bearing platform through the drilling steel pipe pile matched jack, and transferring the original building load to the drilling steel pipe pile through a static pressure underpinning pile;
j) After the peripheral supporting structure of the foundation pit is completed and underground water is controlled through a waterproof curtain or precipitation, earth excavation is further carried out until the elevation of the bottom plate is designed; removing the static pressure underpinning pile along with excavation, and simultaneously arranging lateral supporting members to ensure the compression stability of the drilled steel pipe pile;
k) After the excavation is completed, constructing a basement structure upwards from a bottom plate of the newly constructed basement, and connecting the basement structure with the bottom structure of the original building; the drilled steel pipe pile is firmly connected with the newly built basement bottom plate;
and l) removing the jack matched with the drilled steel pipe pile after the newly built basement structure is connected with the original building structure, and removing redundant drilled steel pipe piles to complete the storey adding transformation of the existing building basement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011416032.1A CN112576056B (en) | 2020-12-07 | 2020-12-07 | Underpinning support system for storey-adding reconstruction of existing building basement and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011416032.1A CN112576056B (en) | 2020-12-07 | 2020-12-07 | Underpinning support system for storey-adding reconstruction of existing building basement and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN112576056A CN112576056A (en) | 2021-03-30 |
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| CN113235970B (en) * | 2021-06-09 | 2022-07-29 | 广州市鲁班建筑科技集团股份有限公司 | Structure for separating periphery 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 |
| CN113863705B (en) * | 2021-09-14 | 2023-03-31 | 建研地基基础工程有限责任公司 | Method for underpinning and reinforcing existing building based on static pressure jet grouting steel pipe pile and application device |
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| CN101397852B (en) * | 2007-09-26 | 2010-05-19 | 上海市第二建筑有限公司 | Construction method for increasing to build multi-storey basement to original building |
| CN103321244B (en) * | 2013-03-27 | 2015-09-09 | 江苏苏南建筑技术发展有限公司 | Sand foundation existing building sets up the construction method of basement |
| CN103437567B (en) * | 2013-08-30 | 2015-06-10 | 山东建筑大学 | Method for supporting existing building underground added storey through original pile foundations |
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