CN111794543A - Foundation underpinning system and construction method thereof - Google Patents
Foundation underpinning system and construction method thereof Download PDFInfo
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- CN111794543A CN111794543A CN202010481623.0A CN202010481623A CN111794543A CN 111794543 A CN111794543 A CN 111794543A CN 202010481623 A CN202010481623 A CN 202010481623A CN 111794543 A CN111794543 A CN 111794543A
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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
- 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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Abstract
The application provides a foundation underpinning system and a construction method thereof, wherein the construction method of the foundation underpinning system comprises the following steps: installing underpinning piles at the periphery of the existing building; and removing a first floor bottom plate in the existing building, pouring a underpinning structure at the removed first floor bottom plate, paving prestressed tendons and a tensioning pore canal behind the prestressed tendons in the underpinning structure in sections, enabling the prestressed tendons to penetrate through the wall body of the existing building and the preformed hole of the underpinning pile, and realizing temporary anchoring through an adjustable prestressed anchorage device. In the foundation underpinning system and the construction method thereof, a prestressed foundation underpinning structure is adopted, prestressed tendons are arranged in the prestressed foundation underpinning structure in sections, the prestressed tendons are temporarily anchored by an anchorage device capable of adjusting prestress, the magnitude of the prestress can be dynamically adjusted in the foundation construction process, and further the deformation condition of an upper structure is controlled, the foundation underpinning system is not only light and handy, but also adjustable and controllable, the construction period can be shortened, the construction risk is reduced, and the construction cost is saved.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a foundation underpinning system and a construction method thereof.
Background
In the underground space development process of existing buildings and historical protection buildings, foundation underpinning of the buildings is a crucial link. By adopting the foundation underpinning system, the existing buildings and the historical protection buildings can be protected from settlement, and the original appearances of the existing buildings and the historical protection buildings are prevented from being damaged.
However, the construction of foundation underpinning is limited by the clearance inside the existing building, which often results in larger spacing of underpinned piles and larger span of underpinning system. In order to control the upper structure of the existing building and avoid deformation of the existing building in the foundation underpinning process, the traditional reinforced concrete underpinning system needs very high rigidity, so that the underpinning beam is high in height, heavy, difficult to construct and high in material consumption.
Disclosure of Invention
The invention aims to provide a foundation underpinning system and a construction method thereof, and aims to solve the problems of heavy weight, high construction difficulty and high material consumption of the conventional foundation underpinning system.
In order to solve the technical problem, the invention provides a construction method of a foundation underpinning system, which comprises the following steps:
installing underpinning piles at the periphery of an existing building, wherein the bottoms of the underpinning piles are buried underground, the tops of the underpinning piles are higher than the ground, and the tops of the underpinning piles are provided with reserved holes;
slotting in the wall of the existing building according to the position of the prestressed tendon penetrating through the wall and the design elevation and the design thickness of the underpinning structure;
dismantling a first floor bottom plate in the existing building, and erecting a template of a underpinning structure at the dismantled first floor bottom plate;
laying prestressed tendons and post-tensioning pore canals in the templates of the underpinning structure in sections, wherein the prestressed tendons penetrate through the wall of the existing building and the preformed holes of the underpinning piles;
pouring the underpinning structure and carrying out concrete maintenance;
tensioning the prestressed tendons to enable the prestressed tendons to reach a preset prestress, and performing temporary anchoring by using an adjustable prestressed anchorage device; and
and replacing the adjustable prestressed anchorage device with a permanent anchoring device.
Optionally, in the construction method of the foundation underpinning system, a soil taking opening is reserved in a template of the underpinning structure, and before the adjustable prestressed anchorage device is replaced by the permanent anchoring device, after the prestressed tendons are temporarily anchored, the underground structure is constructed by a reverse construction method through the soil taking opening.
Optionally, in the construction method of the foundation underpinning system, during the reverse construction of the underground structure, the prestress of the prestressed tendons is adjusted according to the deformation condition of the superstructure in the existing building.
Optionally, in the construction method of the foundation underpinning system, before the adjustable prestressed anchorage device is replaced with the permanent anchoring device, after the underground structure is constructed by the reverse method, the method further includes: and cleaning the post-tensioning pore channel, and performing pressure grouting.
Optionally, in the construction method of the foundation underpinning system, the method further includes:
erecting a template of a ground ring beam on the outer side of the existing building while erecting the template of the underpinning structure; and
and pouring the ring beam while pouring the underpinning structure.
Optionally, in the construction method of the foundation underpinning system, before the underpinning structure is poured, after the prestressed tendons and the post-tensioned pore canals are laid in the formwork of the underpinning structure in sections, the method further includes: and (4) performing concrete pouring at the grooving position of the wall body of the existing building.
Optionally, in the construction method of the foundation underpinning system, the method further includes: and before installing underpinning piles on the periphery of the existing building, constructing a foundation pit enclosure system.
Correspondingly, the invention also provides a basic underpinning system, which comprises the following components: underpinning piles and underpinning structures;
the underpinning pile is arranged on the periphery of an existing building, the bottom of the underpinning pile is buried underground, the top of the underpinning pile is higher than the ground, and a preformed hole is formed in the top of the underpinning pile;
the underpinning structure is arranged inside the existing building and is connected with the wall body of the existing building into a whole instead of a first floor bottom plate of the existing building;
the underpinning structure is provided with prestressed tendons and post-tensioning channels thereof in sections, the prestressed tendons penetrate through the wall of the existing building and the preformed hole of the underpinning pile, the anchoring end of the prestressed tendons is provided with an adjustable prestressed anchorage device, and the prestressed tendons pass through the adjustable prestressed anchorage device to realize temporary anchoring.
Optionally, in the foundation underpinning system, the underpinning piles are installed at the periphery and inside of the existing building, the anchoring ends of the prestressed tendons are located at the tops of the underpinning piles, and the prestress of the prestressed tendons can be adjusted in both directions or in one direction.
Optionally, in the foundation underpinning system, the foundation underpinning system further includes a ground ring beam, and the ground ring beam is arranged outside the existing building and surrounds the outer wall of the existing building.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention adopts a prestressed foundation underpinning structure, can reduce the height and the thickness of the underpinning beam, leads a foundation underpinning system to be lighter, and simultaneously increases the clear height of an underground space;
2. the prestressed tendons are embedded in the prestressed foundation underpinning structure in sections, the prestressed tendons are utilized to apply prestress, so that the rigidity of the foundation underpinning system of the existing building is higher, and meanwhile, the underpinning structure can be arched according to the design requirement by controlling the prestress, so that the deformation of the upper structure is effectively counteracted and controlled. Meanwhile, the number of underpinned piles can be reduced, and the clear span of the underground space is increased;
3. the invention adopts the anchorage device capable of adjusting the prestress to temporarily anchor the prestressed tendon, and can dynamically adjust the bidirectional prestress of each section in the foundation construction process so as to accurately control the deformation of the upper structure;
4. the construction method of the foundation underpinning system provided by the invention does not need a large underpinning beam, also omits the construction of a wall clamping beam and a wall penetrating beam, and has short construction period and low cost.
Drawings
FIG. 1 is a schematic diagram of a basic underpinning architecture in accordance with an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A' of FIG. 1;
fig. 3 is a cross-sectional view taken along line B-B' of fig. 1.
Detailed Description
The foundation underpinning system and the construction method thereof proposed by the present invention will be further described in detail with reference to the accompanying drawings and specific examples.
Please refer to fig. 1 to fig. 3, which are schematic structural diagrams of a basic underpinning system according to an embodiment of the present invention. As shown in fig. 1 to 3, the construction method of the foundation underpinning system includes:
step S1, installing underpinning piles 1 on the periphery of an existing building, wherein the bottoms of the underpinning piles 1 are buried underground, the tops of the underpinning piles 1 are higher than the ground, and the tops of the underpinning piles 1 are provided with reserved holes (the numbers in the drawing are not shown);
step S2, slotting in the wall of the existing building according to the position of the prestressed tendon passing through the wall and the design elevation and the design thickness of the underpinning structure 3;
step S3, dismantling a first floor bottom plate in the existing building, and erecting a template of the underpinning structure 3 at the dismantled first floor bottom plate;
step S4, laying prestressed tendons and post-tensioned pore canals (not shown in the figure) in the form of the underpinning structure 3 in sections, wherein the prestressed tendons pass through the wall of the existing building and the preformed holes of the underpinning pile 1;
step S5, pouring the underpinning structure 3 and performing concrete maintenance;
step S6, stretching the prestressed tendons to enable the prestressed tendons to reach the preset prestress, and performing temporary anchoring by using an adjustable prestressed anchorage device 5;
and step S7, replacing the adjustable prestressed anchorage device 5 with a permanent anchoring device.
Specifically, firstly, the construction of a foundation pit enclosure system is carried out, and the underpinning piles 1 are installed on the periphery of the existing building. As shown in fig. 2 and 3, the bottom of the underpinning pile 1 is buried in the ground, the top of the underpinning pile 1 is higher than the ground, and the elevation of the ground is 0.00. The top of the underpinning pile 1 is provided with a preformed hole (the mark is not shown in the figure) which is used for penetrating a prestressed tendon.
The wall body of the existing building comprises an outer wall 11 and an inner wall 12, and the underpinning piles 1 arranged on the periphery of the existing building keep a certain distance from the outer wall 11.
In this embodiment, the underpinning piles 1 are installed on the periphery of the existing building, and the underpinning piles 1 are also installed inside the existing building. Inside an existing building, underpinning piles 1 are typically placed on opposite sides of the inner wall 12 and spaced from the inner wall 12.
Preferably, the underpinning piles 1 are vertically arranged and uniformly distributed, and the underpinning piles 1 in the existing building are opposite to the underpinning piles 1 on the periphery of the existing building.
In step S2, a groove is opened in the wall of the existing building according to the position of the tendon passing through the wall and the design elevation and the design thickness of the underpinning structure 3. The purpose of slotting is on the one hand to let the prestressing tendons pass through the wall body, and on the other hand to let the reliable connection form wholly between the wall body that the underpinning structure 3 of follow-up pouring and existing building remain. For this purpose, the grooving needs to consider the position of the prestressed tendon passing through the wall body and the design elevation and the design thickness of the underpinning structure.
In step S3, the first floor (also called B0) of the existing building is removed to replace the first floor with the underpinning structure 3. And cleaning and leveling the site after the dismantling is finished, and then erecting the template of the underpinning structure 3 at the dismantled bottom plate. In consideration of the subsequent underground structure reverse construction, soil taking openings (not shown) are reserved in the templates of the underpinning structure 3, and the underground structure reverse construction can be performed through the soil taking openings after the underpinning structure 3 is poured.
In order to improve the overall space rigidity of the house and increase the integrity of the building, when erecting the formwork of the underpinning structure 3, the formwork of the ground girth 2 is erected outside the existing building, and the formwork of the ground girth 2 surrounds the outer wall 11 of the existing building and is positioned below the ground.
In step S4, a prestressed tendon and a post-tensioning pore channel are embedded in the formwork of the underpinning structure 3 in sections according to the design requirements, and the prestressed tendon passes through the wall of the existing building and the preformed hole of the underpinning pile 1.
In step S5, the ring beam 2 and the underpinning structure 3 are poured, and concrete is cured to a designed strength, and then the formwork is removed. The ring beam 2 is of a closed structure after being poured, plays a role of a waist hoop on a building, the underpinning structure 3 replaces a first floor bottom plate in the existing building, and a soil taking opening is reserved in the underpinning structure 3. Prior to casting the underpinning structure 3, concrete is required to be cast into the open channels of the outer wall 11 and the inner wall 12 of the existing building. In this way, the underpinning structure 3 can be formed through and securely connected to the existing building wall.
In step S6, the tendon is tensioned, the prestressing force is slowly applied until the tendon reaches the set prestressing force, and temporary anchoring is performed using the adjustable prestressed anchorage 5. Thereby, a self-supporting underpinning structure is formed.
And after the temporary anchoring is finished, performing the reverse construction of the underground structure through the soil taking opening reserved in the underpinning structure 3. In the construction process, the size of the prestress can be adjusted according to the structural deformation condition of the upper part of the existing building. As shown in fig. 2 and 3, the prestress of the tendon corresponding to each adjustable prestressed anchorage 5 can be adjusted by each adjustable prestressed anchorage.
And after the underground structure is constructed by the reverse construction method, cleaning the post-tensioning hole channel of the prestressed tendon, performing pressure grouting, and maintaining to the designed strength.
And finally, replacing all the adjustable prestressed anchors 5 on the anchoring ends with permanent anchoring devices to finish construction.
Correspondingly, the application also provides a basic underpinning system. Referring to fig. 1 to fig. 3, the basic underpinning system 10 includes: underpinning piles 1 and underpinning structures 3; the underpinning pile 1 is installed on the periphery of an existing building, the bottom of the underpinning pile 1 is buried underground, the top of the underpinning pile 1 is higher than the ground, and a preformed hole is formed in the top of the underpinning pile 1; the underpinning structure 3 is arranged inside the existing building and is connected with the wall body of the existing building into a whole instead of a first floor bottom plate of the existing building; prestressed tendons and post-tensioning pore canals thereof are paved in the underpinning structure 3 in sections, the prestressed tendons pass through the wall body of the existing building and the preformed hole of the underpinning pile 1, an adjustable prestressed anchorage device 5 is installed at the anchoring end of the prestressed tendons, and the prestressed tendons pass through the adjustable prestressed anchorage device 5 to realize temporary anchoring.
Specifically, the foundation underpinning system 10 further comprises a ground ring beam 2, and the ground ring beam 2 is arranged on the outer side of the existing building and surrounds the outer wall 11 of the existing building. The underpinning structure 3 is positioned at a first floor (B0 board) and is connected with the wall body of the existing building into a whole, and the underpinning structure can be used as a B0 board of a permanent structure of a basement.
The underpinning structure 3 is provided with prestressed tendons and post-tensioning channels in sections, and the prestressed tendons can perform tensioning operation in the post-tensioning channels. As shown in fig. 2 and 3, the tendon includes a first prestressed tendon 41, a second prestressed tendon 42 and a third prestressed tendon 43. Wherein, the first section of prestressed tendon 41 passes through the preformed hole of one underpinning pile 1, the inner wall 12 and the outer wall 11 of the existing building and the preformed hole of the other underpinning pile 1 in sequence. The second tendon 42 passes through the prepared hole of one underpinning pile 1, the outer wall 11 of the existing building and the prepared hole of the other underpinning pile 1 in sequence. The third segment of prestressed tendons 43 sequentially pass through a prepared hole of one underpinning pile 1, the inner wall 12 and the outer wall 11 of the existing building and a prepared hole of another underpinning pile 1 if meeting the inner wall 12, and sequentially pass through a prepared hole of one underpinning pile 1, the outer wall 11 of the existing building and a prepared hole of another underpinning pile 1 if not meeting the inner wall 12.
In this embodiment, the tendon is arranged in a longitudinal and transverse direction, the transverse tendon is one section, and the longitudinal tendon is divided into two sections. In other embodiments, the prestressed tendons may also be arranged unidirectionally, and the specific sections of the prestressed tendons are determined according to design requirements.
In this embodiment, the underpinning piles 1 are installed at the periphery and inside of the existing building. In other embodiments, the underpinning pile 1 may be installed only on the periphery of the existing building if the span of the existing building is small, and the underpinning pile may not be arranged inside the existing building. With continued reference to fig. 2 and fig. 3, a plurality of anchoring ends of the tendon (i.e., two ends of the first segment of the tendon 41, two ends of the second segment of the tendon 42, and two ends of the third segment of the tendon 43) are all located at the top of the underpinning pile 1, adjustable prestressed anchors 5 are installed at the anchoring ends, and the tendon (including the first segment of the tendon 41, the second segment of the tendon 42, and the third segment of the tendon 43) is temporarily anchored by the adjustable prestressed anchors 5.
In this embodiment, the adjusting prestressed anchorage devices 5 are installed at both ends of the same prestressed tendon, the prestressed tendon can adjust the prestress in two directions, and the underpinning structure 3 is a two-way prestressed foundation underpinning structure. In other embodiments, the same tendon may be installed with the prestress adjusting anchor 5 at only one end, the tendon adjusts the prestress only in one direction, and the underpinning structure 3 is a one-way prestress foundation underpinning structure.
The foundation underpinning system that this embodiment provided adopts prestressing force foundation underpinning structure, can reduce the height of underpinning the roof beam and the thickness of basement roof plate for the foundation underpins the system more lightly, increases the clear height in underground space simultaneously. The prestressed tendons are embedded in the prestressed foundation underpinning structure in sections, the rigidity of a foundation underpinning system of the existing building can be increased by applying the prestress through the prestressed tendons, and the underpinning structure can be arched according to the design requirement by controlling the prestress so as to effectively counteract and control the deformation of the upper structure. Meanwhile, the number of underpinned piles can be reduced, and the clear span of the underground space is increased. In addition, the prestressed tendons are arranged in sections, and are temporarily anchored by using an anchorage device capable of adjusting the prestress, so that the size of the bidirectional prestress of each section can be dynamically adjusted in the foundation construction process, and the deformation of the upper structure can be accurately controlled.
Compared with the traditional existing building foundation underpinning system, the foundation underpinning system provided by the embodiment does not need a large underpinning beam, the construction of clamping a wall beam and penetrating the wall beam is also omitted, the construction period can be shortened, the construction risk is reduced, and the construction cost is saved. The method is particularly suitable for the existing buildings or historical buildings with fewer layers and lighter weight. More importantly, the basic underpinning system provided by the embodiment is adjustable and controllable, and can strictly control the deformation conditions of the existing buildings or historical buildings. The construction of the foundation underpinning system can be combined with the construction of the underground space by a reverse construction method.
In summary, in the foundation underpinning system and the construction method thereof provided by the invention, the prestressed foundation underpinning structure is adopted, the prestressed tendons are arranged in the prestressed foundation underpinning structure in sections, the prestressed tendons are temporarily anchored by the anchorage device capable of adjusting the prestress, and the magnitude of the prestress can be dynamically adjusted in the foundation construction process, so that the deformation condition of the upper structure is strictly controlled, the foundation underpinning system is lighter and has adjustability, the construction period can be shortened, the construction risk is reduced, and the construction cost is saved.
The foregoing is a more detailed description of the present application in connection with specific preferred embodiments and it is not intended that the present application be limited to these specific details. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A construction method of a foundation underpinning system is characterized by comprising the following steps:
installing underpinning piles at the periphery of an existing building, wherein the bottoms of the underpinning piles are buried underground, the tops of the underpinning piles are higher than the ground, and the tops of the underpinning piles are provided with reserved holes;
slotting in the wall of the existing building according to the position of the prestressed tendon penetrating through the wall and the design elevation and the design thickness of the underpinning structure;
dismantling a first floor bottom plate in the existing building, and erecting a template of a underpinning structure at the dismantled first floor bottom plate;
laying prestressed tendons and post-tensioning pore canals in the templates of the underpinning structure in sections, wherein the prestressed tendons penetrate through the wall of the existing building and the preformed holes of the underpinning piles;
pouring the underpinning structure and carrying out concrete maintenance;
tensioning the prestressed tendons to enable the prestressed tendons to reach a preset prestress, and performing temporary anchoring by using an adjustable prestressed anchorage device; and
and replacing the adjustable prestressed anchorage device with a permanent anchoring device.
2. The method of constructing a foundation underpinning system as claimed in claim 1, wherein a soil-taking opening is reserved in a formwork of the underpinning structure, and a reverse construction method of an underground structure is performed through the soil-taking opening after the tendon is temporarily anchored before the adjustable prestressed anchorage device is replaced with a permanent anchoring device.
3. The method of constructing a foundation underpinning system as claimed in claim 2, wherein the prestressing of said tendons is adjusted according to the deformation of the superstructure in said existing building during the reverse construction of said underground structure.
4. The method of constructing a foundation underpinning system as claimed in claim 2, wherein before the step of replacing the adjustable prestressed anchorage with the permanent anchoring means, after the step of constructing the underground structure by reverse method, the method further comprises: and cleaning the post-tensioning pore channel, and performing pressure grouting.
5. The method of constructing a foundation underpinning system as recited in claim 1, further comprising:
erecting a template of a ground ring beam on the outer side of the existing building while erecting the template of the underpinning structure; and
and pouring the ring beam while pouring the underpinning structure.
6. The method of constructing a foundation underpinning system as defined in claim 1, wherein before the underpinning structure is poured, after the prestressed tendons and the post-tensioned tunnels are laid in the formworks of the underpinning structure in sections, the method further comprises: and (4) performing concrete pouring at the grooving position of the wall body of the existing building.
7. The method of constructing a foundation underpinning system as recited in claim 1, further comprising: and before installing underpinning piles on the periphery of the existing building, constructing a foundation pit enclosure system.
8. A foundation underpinning system comprising: underpinning piles and underpinning structures;
the underpinning pile is arranged on the periphery of an existing building, the bottom of the underpinning pile is buried underground, the top of the underpinning pile is higher than the ground, and a preformed hole is formed in the top of the underpinning pile;
the underpinning structure is arranged inside the existing building and is connected with the wall body of the existing building into a whole instead of a first floor bottom plate of the existing building;
the underpinning structure is provided with prestressed tendons and post-tensioning channels thereof in sections, the prestressed tendons penetrate through the wall of the existing building and the preformed hole of the underpinning pile, the anchoring end of the prestressed tendons is provided with an adjustable prestressed anchorage device, and the prestressed tendons pass through the adjustable prestressed anchorage device to realize temporary anchoring.
9. A foundation underpinning system as claimed in claim 8 wherein said underpinning piles are installed in and around the perimeter of said existing building and said tendons are anchored at their top ends, the prestressing of said tendons being adjustable either bi-directionally or uni-directionally.
10. The foundation underpinning system of claim 8 further comprising a ground ring beam disposed outside of and surrounding an exterior wall of said existing building.
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| CN202010481623.0A CN111794543A (en) | 2020-06-01 | 2020-06-01 | Foundation underpinning system and construction method thereof |
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| CN202010481623.0A CN111794543A (en) | 2020-06-01 | 2020-06-01 | Foundation underpinning system and construction method thereof |
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Application publication date: 20201020 |