CN109667295B - Underground excavation assembly type underpinning structure at lower part of existing building base and construction method thereof - Google Patents
Underground excavation assembly type underpinning structure at lower part of existing building base and construction method thereof Download PDFInfo
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- CN109667295B CN109667295B CN201811403547.0A CN201811403547A CN109667295B CN 109667295 B CN109667295 B CN 109667295B CN 201811403547 A CN201811403547 A CN 201811403547A CN 109667295 B CN109667295 B CN 109667295B
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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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- 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
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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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Abstract
The invention discloses an underground excavation assembled underpinning structure of the lower part of an existing building base, which comprises a rectangular steel pipe and a prefabricated part, wherein shear pin keys are arranged on two opposite side walls of the rectangular steel pipe, which extend along the length direction, pin key grooves matched with the shear pin keys are arranged on the prefabricated part, and the prefabricated part is butted with the rectangular steel pipe through the shear pin keys and the pin key grooves. The rectangular steel pipe is provided with a transverse prestressed pore channel, the prefabricated part is also provided with a longitudinal prestressed pore channel, the transverse prestressed pore channel penetrates through the prefabricated part, a transverse prestressed steel bar penetrates through the transverse prestressed pore channel, a longitudinal prestressed steel bar penetrates through the longitudinal prestressed pore channel, and the prefabricated part is also provided with a grouting pore channel. The invention also discloses a construction method of the underpinning structure, and the method of combining the rectangular steel pipe and the prefabricated part in the assembled underpinning structure can not only avoid on-site wet operation and reduce construction difficulty, but also shorten construction period.
Description
Technical Field
The invention belongs to the technical field of engineering reinforcement and transformation, and particularly relates to a subsurface excavation assembled underpinning structure at the lower part of a foundation of an existing building and a construction method thereof.
Background
The integral displacement technology of buildings, the base shock insulation and reinforcement technology and the like are important components of the reinforcement and reconstruction technology of building structures, and play a very key role in urban reconstruction and construction. Underpinning of upper loads of buildings is a key core technology of the projects, and at present, reinforced concrete underpinning nodes are mostly adopted in related projects at home and abroad to underpin concrete columns.
The construction method adopting the reinforced concrete underpinning node comprises the following steps: the method comprises the steps of firstly removing relevant decoration layers on the bottom layer (or basement) of the building to expose the original structure of the building, then pouring a lower track structure and an upper track beam in the building, constructing reinforced concrete underpinning nodes on structural columns and walls while pouring the upper track beam, cutting the underpinned columns and relevant walls at specified positions after the upper track structure and the lower track structure and the underpinning nodes reach design strength, and finally removing the upper track structure and the lower track structure in the building after the whole building is translated in place to restore the decoration layers in the building.
If the traditional underpinning structure and the translation method are used, the space inside the building is obviously required to be occupied to be used as construction operation space, but the method is obviously not suitable for the project that the bottom surface of the first floor of the existing building is not allowed to be broken, so in order to solve the contradiction, the invention provides the underpinning structure and the underpinning method for the underground excavation of the lower part of the building base.
Disclosure of Invention
The invention provides a subsurface excavation assembled underpinning structure at the lower part of a foundation of an existing building and a construction method thereof, and aims to solve the problem that the daily use of the building is influenced because the internal space of the building needs to be occupied in the existing underpinning technology.
The technical problem to be solved by the invention is realized by the following technical scheme:
a subsurface excavation assembled underpinning structure for the lower part of an existing building base comprises a rectangular steel pipe and prefabricated parts, wherein the rectangular steel pipe is positioned under an original foundation on the lower side of the building base, the length direction of the rectangular steel pipe is consistent with that of the original foundation, and two opposite side walls, extending along the length direction, of the rectangular steel pipe are provided with shear pin keys;
the prefabricated part is provided with a pin key groove matched with the shear pin key, and the prefabricated part is butted with the rectangular steel pipe through the shear pin key and the pin key groove;
the rectangular steel pipe is internally provided with a transverse prestressed duct, the transverse prestressed duct penetrates through prefabricated parts on two sides of the rectangular steel pipe, the prefabricated parts are also provided with longitudinal prestressed ducts, the transverse prestressed duct is vertical to the longitudinal prestressed duct, transverse prestressed reinforcements penetrate through the transverse prestressed duct, longitudinal prestressed reinforcements penetrate through the longitudinal prestressed duct, and the prefabricated parts are also provided with grouting ducts;
the rectangular steel pipe is provided with a movable rolling shaft, and an upper joist is mounted on the movable rolling shaft.
Further, the shear pin key is of an outward convex structure; or the shear pin key is of a retractable foot type structure.
Further, the transverse prestressed duct comprises a first layer of transverse prestressed duct and a second layer of transverse prestressed duct which are at different heights.
Further, the wall thickness of the rectangular steel pipe is 10mm or more, the height of the rectangular steel pipe is 1.5m or more, and the width of the rectangular steel pipe is 0.8m or more.
Furthermore, four edges of the rectangular steel pipe are provided with triangular stiffening ribs, and the distance between every two adjacent triangular stiffening ribs is 300 mm.
A construction method based on the underground excavation assembly type underpinning structure at the lower part of the existing building base comprises the following steps:
s1: determining the burial depth of the underpinning structure and determining the construction position on a plane according to the axis position of the original foundation, the size of the foundation beam and the weight of the upper building;
s2: excavating a pilot tunnel for placing a rectangular steel pipe and construction equipment outside the building boundary;
s3: firstly, mounting a PVC pipe at a reserved hole of a rectangular steel pipe, then pressing the rectangular steel pipe into the lower part of the original foundation, and then removing soil inside the rectangular steel pipe after the rectangular steel pipe is in place until the rectangular steel pipe penetrates through the whole foundation;
s4: plugging one end of the rectangular steel pipe, pouring concrete in the rectangular steel pipe, and pouring the concrete from inside to outside by using a guide pipe;
s5: processing the prefabricated part;
s6: recording the length range of a section of prefabricated part as an operation unit, and excavating first operation units on two sides of a rectangular steel pipe;
s7: installing the shear pin key and the prefabricated part in place;
s8: inserting transverse prestressed reinforcements in transverse prestressed ducts of the prefabricated parts and the rectangular steel pipes, and tensioning the transverse prestressed reinforcements;
s9: excavating the next construction unit and installing a prefabricated part;
s10: performing base grouting through a grouting pore channel of the prefabricated part until the prefabricated part is full and compact;
s11: after all prefabricated parts are assembled in place, the longitudinal prestressed reinforcements are inserted and tensioned through the longitudinal prestressed pore channels.
The invention has the beneficial effects that:
according to the invention, the rectangular steel pipe and the prefabricated part are arranged at the lower part of the building base to form a combined foundation, so that the effect of enhancing the bearing performance of the translation track is achieved. The method of combining the rectangular steel pipe and the prefabricated part in the assembled underpinning structure can not only avoid on-site wet operation and reduce construction difficulty, but also shorten construction period. This pin-connected panel underpins structure is under construction in the convenient outside of building, need not to occupy the indoor space to avoid developing the construction at building one deck (or basement), reduce additional economic losses such as the inside business that stops of building, first floor facility relocation, later stage ground resume. In addition, the assembly component can be disassembled and reused after the building is transformed, and has certain economical efficiency.
Drawings
FIG. 1 is a schematic diagram of the operation of the underpinning structure of the present invention;
FIG. 2 is a schematic view of the connection of rectangular steel pipes with outwardly protruding shear pin keys according to the present invention;
FIG. 3 is a schematic view of the connection between the rectangular steel pipe and the retractable shear pin key according to the present invention.
Description of reference numerals:
1-rectangular steel pipe, 2-prefabricated part, 3-original foundation, 4-transverse prestressed duct, 5-upper joist, 6-shear pin key, 7-longitudinal prestressed duct, 8-grouting duct and 9-mobile roller.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
As shown in fig. 1 to 3, the existing underground excavation assembly type underpinning structure for the lower part of the building base comprises a rectangular steel pipe 1 and prefabricated components 2, wherein the rectangular steel pipe 1 is positioned at a certain depth under an original foundation 3 on the lower side of the building base. The rectangular steel pipe 1 is provided with a movable rolling shaft 9, and the movable rolling shaft 9 is provided with an upper joist 5. The space size of the rectangular steel pipe 1 is required to meet the requirement of workers for internal construction operation, the wall thickness of the rectangular steel pipe 1 is more than 10mm, the height of the rectangular steel pipe 1 is more than 1.5m, and the width of the rectangular steel pipe 1 is more than 0.8 m. Four corners of the rectangular steel pipe 1 are provided with triangular stiffening ribs for enhancing the stability of the rectangular steel pipe, and the distance between the adjacent triangular stiffening ribs is 300 mm. The length direction of the rectangular steel pipe 1 is consistent with that of the original foundation 3, and shear pin keys 6 are welded on two opposite side walls of the rectangular steel pipe 1 extending along the length direction and used for bearing shear force on a connecting interface of the rectangular steel pipe 1 and the prefabricated part 2. The shear pin key 6 has an outward convex structure; or the shear pin key 6 is of a retractable foot type structure. The prefabricated part 2 is provided with a pin key groove matched with the shear pin key 6, and the prefabricated part 2 is butted with the rectangular steel pipe 1 through the shear pin key 6 and the pin key groove.
A transverse prestressed duct 4 is arranged in the rectangular steel pipe 1, the transverse prestressed duct 4 penetrates through the prefabricated parts 2 on two sides of the rectangular steel pipe 1, a longitudinal prestressed duct 7 is further arranged on the prefabricated parts 2, and the transverse prestressed duct 4 is perpendicular to the longitudinal prestressed duct. The distance between the adjacent transverse prestressed ducts 4 is 500mm, and the distance between the adjacent longitudinal prestressed ducts 7 is also 500 mm. The transverse prestressed reinforcement penetrates through the transverse prestressed pore passage 4, the longitudinal prestressed reinforcement penetrates through the longitudinal prestressed pore passage 7, and the prefabricated part 2 and the rectangular steel pipe 1 are connected into a whole through the penetration of the transverse prestressed reinforcement and the longitudinal prestressed reinforcement. The prefabricated component 2 is also provided with a grouting hole 8, and the diameter of the grouting hole 8 is 30-60 mm. After the prefabricated part 2 is installed in place, grouting is performed through the grouting hole 8, and the reliable connection of the whole underpinning structure and the foundation soil is realized. The transverse prestressed duct 4 comprises a first layer of transverse prestressed duct and a second layer of transverse prestressed duct which are at different heights, and the first layer of transverse prestressed duct and the second layer of transverse prestressed duct are at different horizontal planes.
A construction method based on the underground excavation assembly type underpinning structure at the lower part of the existing building base comprises the following steps:
s1: according to the axial line position, the size of a foundation beam and the weight of an upper building of a building foundation, the number and the size of the rectangular steel pipe 1 and the prefabricated parts 2 are designed, the burial depth of the underpinning structure is determined, and the construction position on a plane is determined, specifically, the rectangular steel pipe 1 is made of steel members, and the prefabricated parts 2 are made of concrete through pouring;
s2: excavating a pilot pit for placing the rectangular steel pipe 1 and construction equipment outside a building boundary, wherein the range of the pilot pit is not smaller than the size of a section of the rectangular steel pipe 1 and the construction equipment, and related supporting and drainage measures are required to be provided inside the pilot pit;
s3: firstly, mounting PVC pipes at the positions of reserved holes of rectangular steel pipes 1, then pressing the rectangular steel pipes 1 into the lower part of an original foundation 3, reserving 0.5-0.8 m before each section of rectangular steel pipe 1 is pressed into the soil, taking out the soil in the rectangular steel pipes 1 after the rectangular steel pipes are in place, firmly welding the rectangular steel pipes 1 with the next section of rectangular steel pipe, pressing the rest pipe bodies into the soil, and taking out the soil in the rectangular steel pipes 1 after the rectangular steel pipes are in place until the rectangular steel pipes 1 penetrate through the whole foundation;
s4: one end of the rectangular steel pipe 1 is plugged, concrete is poured into the rectangular steel pipe 1, the concrete inside the rectangular steel pipe 1 is self-compacting concrete, the concrete is poured by using a guide pipe, and the pouring operation is performed from inside to outside and is finished at one time;
s5: processing the prefabricated part 2 in a factory;
s6: recording the length range of a section of prefabricated part as an operation unit, excavating first operation units on two sides of the rectangular steel pipe 1, wherein the excavation range is larger than the occupied space of the prefabricated part;
s7: installing the shear pin keys 6 and the prefabricated parts 2 in place;
s8: inserting transverse prestressed reinforcements into the prefabricated part 2 and the transverse prestressed pore channels 4 of the rectangular steel pipe 1, and tensioning the transverse prestressed reinforcements;
s9: excavating the next construction unit, and installing the prefabricated part 2 and inserting and tensioning the transverse prestressed steel bars according to the step S8;
s10: performing base grouting through the grouting pore channel 8 of the prefabricated part 2 until the prefabricated part is full and compact;
s11: after all prefabricated parts are assembled in place, the longitudinal prestressed reinforcements are inserted and tensioned through the longitudinal prestressed pore channels 7.
According to the underground excavation assembled underpinning structure and the underpinning method for the existing building base, the rectangular steel pipe 1 and the prefabricated part 2 are arranged at the lower part of the existing building base, and the shear pin keys 6, the pin key grooves, the transverse prestressed steel bars and the longitudinal prestressed steel bars are arranged to be tightly connected, so that the effect of effectively supporting the upper load of the building base is achieved. By using the underpinning structure and the construction method, after the building is transformed, the assembled components can be disassembled and reused, and in addition, the underpinning structure is constructed outside the building boundary without occupying indoor space, so that the construction is avoided in one floor (or basement) of the building, the additional economic losses such as stopping business inside the building, moving first-floor facilities, recovering later-stage ground and the like are reduced, and the underpinning structure and the construction method have obvious practical value and outstanding technical advantages for the transformation projects of commercial buildings, houses, schools and the like.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The utility model provides an existing building basement lower part secretly digs pin-connected panel underpinning structure which characterized in that: the steel tube structure comprises a rectangular steel tube (1) and prefabricated parts (2), wherein the rectangular steel tube (1) is positioned under an original foundation (3) on the lower side of a building base, the length direction of the rectangular steel tube (1) is consistent with that of the original foundation (3), and two opposite side walls, extending along the length direction, of the rectangular steel tube (1) are provided with shear pin keys (6);
a pin key groove matched with the shear pin key (6) is arranged on the prefabricated part (2), and the prefabricated part (2) is butted with the rectangular steel pipe (1) through the shear pin key (6) and the pin key groove;
a transverse prestressed duct (4) is formed in the rectangular steel pipe (1), the transverse prestressed duct (4) penetrates through prefabricated parts (2) on two sides of the rectangular steel pipe (1), a longitudinal prestressed duct (7) is further formed in each prefabricated part (2), the transverse prestressed duct (4) is perpendicular to the longitudinal prestressed duct (7), transverse prestressed reinforcements penetrate through the transverse prestressed duct (4), longitudinal prestressed reinforcements penetrate through the longitudinal prestressed duct (7), and grouting ducts (8) are further formed in the prefabricated parts (2);
a movable rolling shaft (9) is arranged on the rectangular steel pipe (1), and an upper joist (5) is mounted on the movable rolling shaft (9);
the shear pin key (6) is of an outward convex structure.
2. The underpinning structure of the underground excavation assembly type of the existing building basement as claimed in claim 1, characterized in that: the transverse prestressed duct (4) comprises a first layer of transverse prestressed duct and a second layer of transverse prestressed duct which are at different heights.
3. The underpinning structure of the underground excavation assembly type of the existing building basement as claimed in claim 1, characterized in that: the wall thickness of the rectangular steel pipe (1) is more than 10mm, the height of the rectangular steel pipe (1) is more than 1.5m, and the width of the rectangular steel pipe (1) is more than 0.8 m.
4. The underpinning structure of the underground excavation assembly type of the existing building basement as claimed in claim 1, characterized in that: four corners of the rectangular steel pipe (1) are provided with triangular stiffening ribs, and the distance between the triangular stiffening ribs is 300 mm.
5. A construction method of an existing building foundation lower undercut pin-connected panel underpinning structure based on any one of claims 1 to 4, characterized by comprising the following steps: the method comprises the following steps:
s1: determining the burial depth of the underpinning structure and determining the construction position on a plane according to the axis position of the original foundation (3), the size of the foundation beam and the weight of the upper building;
s2: excavating a pilot tunnel for placing a rectangular steel pipe (1) and construction equipment outside a building boundary;
s3: firstly, mounting a PVC pipe at a preformed hole position of a rectangular steel pipe (1), then pressing the rectangular steel pipe (1) into the lower part of an original foundation (3), taking out internal soil after the rectangular steel pipe (1) is in place until the rectangular steel pipe (1) penetrates through the whole foundation;
s4: plugging one end of the rectangular steel pipe (1), pouring concrete in the rectangular steel pipe (1), and pouring the concrete from inside to outside by using a guide pipe;
s5: processing the prefabricated part (2);
s6: recording the length range of a section of prefabricated part as an operation unit, and excavating first operation units on two sides of a rectangular steel pipe (1);
s7: installing the shear pin key (6) and the prefabricated part (2) in place;
s8: transverse prestressed reinforcements are inserted into the transverse prestressed channels (4) of the prefabricated part (2) and the rectangular steel pipe (1) and are tensioned;
s9: excavating the next construction unit and installing a prefabricated part (2);
s10: performing base grouting through a grouting pore channel (8) of the prefabricated part (2) until the prefabricated part is full and compact;
s11: after all prefabricated parts are assembled in place, the longitudinal prestressed reinforcements are inserted and tensioned through the longitudinal prestressed pore channels (7).
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| CN201811403547.0A CN109667295B (en) | 2018-11-23 | 2018-11-23 | Underground excavation assembly type underpinning structure at lower part of existing building base and construction method thereof |
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| CN201811403547.0A CN109667295B (en) | 2018-11-23 | 2018-11-23 | Underground excavation assembly type underpinning structure at lower part of existing building base and construction method thereof |
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| CN109667295B true CN109667295B (en) | 2020-11-10 |
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| CN111794543A (en) * | 2020-06-01 | 2020-10-20 | 上海建工二建集团有限公司 | Foundation underpinning system and construction method thereof |
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| CN101054803A (en) * | 2007-05-15 | 2007-10-17 | 河北省建筑科学研究院 | Method for ancient architecture base integral support and change |
| KR100886922B1 (en) * | 2008-07-15 | 2009-03-09 | 박순주 | Footing reinforcing or structure recovering method |
| CN103075024A (en) * | 2012-11-09 | 2013-05-01 | 河南省建设集团有限公司 | Space truss underpinning structure with combination of steel and prestressed concrete and construction method thereof |
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