CN113356291A - Pile foundation underpinning construction method suitable for tunnel underpinning building - Google Patents
Pile foundation underpinning construction method suitable for tunnel underpinning building Download PDFInfo
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- CN113356291A CN113356291A CN202110709528.6A CN202110709528A CN113356291A CN 113356291 A CN113356291 A CN 113356291A CN 202110709528 A CN202110709528 A CN 202110709528A CN 113356291 A CN113356291 A CN 113356291A
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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
A pile foundation underpinning construction method suitable for a tunnel underpass building comprises the following steps of arranging a working well and arranging a construction platform in the working well; excavating an upper half construction channel; constructing a pile foundation underpinning structure at the top of the newly-built tunnel in the upper half construction channel, and constructing two rows of underpinning piles in the stratum corresponding to the lower half construction channel which is not excavated; pouring a underpinning pile extension section between a pile foundation underpinning structure serving as the top of the newly-built tunnel and an underpinning pile; excavating a lower half construction channel and removing the existing pile foundation; constructing a pile foundation underpinning structure at the bottom of the newly-built tunnel, and constructing the other part of the pile foundation underpinning structure at two side parts of the newly-built tunnel by taking underpinning piles as a basic framework; and (5) performing waterproofing and backfilling treatment on the outer side of the newly-built tunnel. The method is suitable for the situation that the depth of the newly-built underground passage exceeds the depth of the existing pile foundation, and the problem that the traditional method cannot be normally implemented under the situation is solved.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a pile foundation underpinning construction method suitable for a tunnel underpinning building.
Background
With the development of rail transit industry in recent years, subway rail transit industry is getting into the visual field of people. The quality of life of people is greatly improved due to continuous improvement and upgrading of underground rail transit in China. Although the infrastructure construction of China is relatively perfect at present, the condition of passing through a building under the subway interval tunnel construction cannot be avoided. In the construction of subway tunnels, how to smoothly cut off the pile foundations under the condition of stable integral structure becomes a difficult problem of tunnel construction, and therefore, underpinning of the pile foundations is a feasible method. The pile foundation underpinning means that a new structure is effectively connected with a pile foundation, and an original pile foundation is cut off, so that the load of an upper structure is transferred to the new structure. The construction structure comprises an original bearing platform, an existing pile, a newly-built pile and a newly-built underpinning beam, wherein the underpinned pile is a pile foundation on the edge of the original bearing platform, and further comprises a newly-built pile cap and a pile-embracing type pile cap, the newly-built pile cap is positioned at the top of the newly-built pile, and the pile-embracing type pile cap is positioned on the existing pile on the adjacent side of the underpinned pile; the jacking devices are respectively arranged on the newly-built pile cap and the pile embracing type pile cap; the newly-built underpinning beam is connected with the original bearing platform, and the newly-built underpinning beam is positioned above the newly-built pile. The construction method of pile foundation underpinning utilizes the existing pile and newly-built pile as jacking platforms to underpin the pile foundation, the existing pile on the adjacent side of the underpinned pile is used, and the existing pile embracing pile type pile cap is constructed on the existing pile on the adjacent side; and constructing a newly-built pile, and constructing a newly-built pile cap on the newly-built pile.
When a newly built underground project conflicts with the foundation of the upper structure pile, pile foundation underpinning is also a feasible method for solving the project conflict. When superstructure structure adopted the end-bearing pile, when newly-built underground works construction area degree of depth was shallow in superstructure pile foundation, can carry out newly-built engineering excavation earlier, the end-bearing pile still keeps the bearing capacity this moment, guarantees that superstructure is complete, treats that underpinning structure and pile foundation connected node construction accomplish, cuts off newly-built engineering scope pile foundation, and pile foundation underpins the process and accomplishes. However, when the construction area of the newly built underground construction exceeds the depth of the upper structural pile foundation, if the newly built construction is still excavated, the pile foundation cannot maintain the end bearing capacity, and the underpinning construction process described above cannot be implemented.
Disclosure of Invention
The technical purpose of the invention is to provide a pile foundation underpinning construction method suitable for a tunnel underpass building, so that pile foundation underpinning construction can be safely and stably realized on the premise of maintaining normal use of an upper structure when the condition that the depth of a construction area of a newly-built underground engineering exceeds the depth of a pile foundation of the upper structure is met.
The specific technical scheme of the invention is as follows: a pile foundation underpinning construction method suitable for a tunnel underpinning building comprises the following steps,
the method comprises the following steps: arranging a working well on the adjacent side of the upper building structure, and arranging a construction platform in the working well;
step two: excavating an upper half construction channel below the upper building structure, wherein the depth of the upper half construction channel is less than that of an existing pile foundation of the upper building structure;
step three: constructing a pile foundation underpinning structure at the top of the newly-built tunnel in the upper half construction channel, and constructing two rows of underpinning piles in the stratum corresponding to the lower half construction channel which is not excavated, wherein the underpinning piles belong to one part of the pile foundation underpinning structure at two side parts of the newly-built tunnel;
step four: pouring a underpinning pile extension section for connecting the underpinning pile and the underpinning pile between the pile foundation underpinning structure serving as the top of the newly-built tunnel and the underpinning pile, and cutting off the part of the existing pile foundation exposed out of the upper half construction channel;
step five: continuously excavating a lower half construction channel corresponding to the upper half construction channel and removing the existing pile foundation in the lower half construction channel;
step six: constructing a pile foundation underpinning structure at the bottom of the newly-built tunnel and constructing the other part of the pile foundation underpinning structure at two side parts of the newly-built tunnel by taking the underpinning pile as a basic framework in the whole construction channel;
step seven: and performing waterproofing and backfilling treatment on the outer side of the newly-built tunnel in the whole construction channel.
Preferably, in the third step, the underpinning structure of the pile foundation at the top of the newly-built tunnel comprises underpinning cross beams and a pouring top plate, the underpinning cross beams are the bearing parts at the top of the tunnel connected between the existing pile foundations of the upper building structure, and the pouring top plate is the bearing part at the top of the tunnel connected between the underpinning cross beams.
Preferably, in the third step, the pile foundation underpinning structure used as the top of the newly-built tunnel is connected and fixed with the working well.
Preferably, in the fourth step, a portion of the existing pile foundation exposed in the upper half construction channel is cut off in advance.
Preferably, in the fifth step, the depth of the lower half construction channel is smaller than the depth of the underpinning pile.
Preferably, in the sixth step, the underpinning structure of the pile foundation at the bottom of the newly-built tunnel comprises a casting base, and the casting base is connected with the underpinning pile.
Preferably, in the sixth step, the other part of the underpinning structure of the pile foundation at the two side parts of the newly-built tunnel comprises pouring side walls, and the pouring side walls are connected with the underpinning piles and the pouring base.
Preferably, the casting side wall is a longitudinal wall body which wraps the underpinning piles, or the casting side wall is a longitudinal wall body which is connected between the underpinning piles.
Preferably, in the second step and the fifth step, temporary enclosure construction is carried out on two sides of the construction channel.
Preferably, in the first step and the second step, the table top of the construction platform is flush with the bottom surface of the upper half construction channel to be excavated.
The technical advantages of the invention lie in that the construction method is suitable for the situation that the depth of the newly-built tunnel exceeds the depth of the existing pile foundation, and overcomes the problem that the traditional method can not be normally implemented under the situation, the scheme is divided into two excavation processes of the first half construction channel and the second half construction channel, after the first half construction channel is excavated, the engineering of the pile foundation underpinning structure and underpinning piles (namely, the engineering of the pile foundation underpinning structure at the top of the newly-built tunnel and the underpinning piles at the two side parts of the newly-built tunnel) is firstly constructed, then the first half construction channel and the second half construction channel are jointed to form a basic underpinning system, the bearing transition of the upper building structure is realized, then the second half construction channel is excavated and the pile foundation underpinning structure at the bottom of the newly-built tunnel and the other part of the pile foundation underpinning structure at the two side parts of the newly-built tunnel are constructed, the integral pile foundation underpinning structure is formed after the existing pile foundation is removed, the whole underpinning process is convenient and rapid, and the structure bearing is stable, is worth popularizing in the field.
Drawings
FIG. 1 is a schematic cross-sectional view of a first step and a second step of the present invention;
FIG. 2 is a schematic cross-sectional view of a third step according to the present invention;
FIG. 3 is a schematic cross-sectional view of a third step according to the present invention;
FIG. 4 is a schematic cross-sectional view of the fourth step according to the present invention, wherein the cross-sectional view is vertical (upper view) and horizontal (lower view);
FIG. 5 is a schematic cross-sectional view of step five according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a sixth step according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of step seven according to the present invention, showing the vertical (upper view) and horizontal (lower view);
the names of the parts corresponding to the numbers in the figure are respectively: 1-upper building structure, 2-working well, 3-construction platform, 4-temporary blocking wall, 5-existing pile foundation, a-pre-cut section, 6-underpinning beam, 7-pouring top plate, 8-pouring connecting section, 9-underpinning pile, 10-underpinning pile extension section, 11-pouring base, 12-pouring side wall, 13-temporary enclosure and 14-plain concrete.
Detailed Description
The invention will be further illustrated by means of specific embodiments in the following description with reference to the accompanying drawings:
an embodiment of a pile foundation underpinning construction method suitable for a tunnel underpinning building comprises the following steps,
the method comprises the following steps: referring to fig. 1, a working well 2 is arranged at the adjacent side of an upper building structure 1, and a construction platform 3 is arranged in the working well 2; the upper building structure 1 in this example is a basement, one working well 2 is arranged on each of two sides of the basement, a construction platform 3 is arranged in one working well 2, each working well 2 is provided with a temporary blocking wall 4 (not completely blocking the area, and leaving a through opening between the working well 2), and the area between the two temporary blocking walls 4 is a construction channel or the area where a new tunnel is located.
Step two: according to the figure 1, the depth of the table top of the construction platform 3 is used as the depth of the bottom surface of an upper half construction channel to be excavated, an upper half construction channel is excavated below an upper building structure 1, the depth of the upper half construction channel is smaller than that of an existing pile foundation 5 of the upper building structure 1, after the upper half construction channel is completely excavated, the existing pile foundation 5 of a basement is exposed, the root of the pile foundation at the moment is still buried in a stratum corresponding to the lower half construction channel which is not excavated, protection is paid attention during excavation, stability of an end bearing rock-soil body at the lower part of the pile foundation is guaranteed, an underground anchor rod is cut off if the underground anchor rod exists, and temporary enclosures 13 are arranged on two sides of the upper half construction channel.
Step three: referring first to fig. 3, in the upper half of the construction path, the pile-foundation underpinning structure as the top of the newly-built tunnel is constructed, which includes underpinning beams 6 and a cast-in roof 7, the underpinning beams 6 being tunnel-top bearing portions disposed along the short-axis direction of the newly-built tunnel (the projection of the newly-built tunnel in a top view) and connected between the existing pile foundations 5 of the upper building structure 1; as can be appreciated from the cross-sectional view of figure 3, there are two new tunnels in this example, with one of the underpinning beams 6 spanning three existing pilings 5 in a row and the other underpinning beam 6 spanning two existing pilings 5 in a row; the pouring top plate 7 is a bearing part at the top of the tunnel connected between the underpinning cross beams 6, and the pouring top plate 7 is a connecting section in a space between the underpinning cross beams 6 where no pile foundation 5 exists; in order to ensure the structural strength and stability, the pile foundation underpinning structure used as the top of the newly-built tunnel is also connected and fixed with the working well 2, and a pouring forming mode is adopted, so that two ends of the structure extend out of a pouring connecting section 8 to be fixedly connected with the side wall of the working well 2, and the bearing is shared.
In addition, two rows of underpinning piles 9 are constructed in the stratum corresponding to the lower half construction channel which is not excavated, as shown in fig. 2 and fig. 3, the underpinning piles 9 belong to a part of a pile foundation underpinning structure which is used as two side parts of the newly-built tunnel, the pile foundation underpinning structure which is used as the two side parts of the newly-built tunnel comprises the underpinning pile 9 part and the other pouring side wall 10 part in the step six, the underpinning piles 9 are also formed in a pouring mode, are embedded in the stratum corresponding to the lower half construction channel which is not excavated in advance, and underpinning pretreatment such as roughening, rib planting and the like is carried out on the existing pile foundation 5 to be underpinned at the same time.
Step four: referring to fig. 4, a underpinning pile extension section 10 for connecting the underpinning pile 9 and the underpinning pile underpinning structure serving as the top of the newly-built tunnel is poured between the underpinning pile 9 and the underpinning cross beam 6, and the underpinning pile 9 is connected with the underpinning cross beam 6 or the pouring top plate 7 through the underpinning pile extension section 10; when the underpinning pile extension section 10 is formed, a basic pile foundation underpinning structure system is formed, at the moment, the underpinning pile 9, the underpinning cross beam 6 and the pouring top plate 7 have certain bearing capacity, the existing pile foundation 5 can be replaced and removed, and at the moment, the part of the existing pile foundation 5 exposed in the upper half construction channel can be selected to be cut in advance, namely the pre-cut section a in fig. 4.
Step five: continuing to dig a lower half construction channel corresponding to the upper half construction channel, forming the whole construction channel, wherein the depth of the lower half construction channel is less than that of the underpinning pile 9, namely the underpinning pile 9 is longitudinally and downwards embedded into a stratum deeper than the whole construction channel, and additionally, a temporary enclosure 13 of the lower half construction channel is also made; in this step, the existing pile foundations 5 located in the construction channel may be cut off entirely, leaving only the underpinning pile 9. The depth of the lower half of the construction channel is also greater than the depth of the existing pilings of the superstructure 1 (the relative definition of depth is to be understood here as meaning that excavation of the lower half of the construction channel will cause the superstructure 1 to lose its intended basic load and collapse, and that there may be some few if any existing pilings still buried in the ground, not all of the pilings having a smaller depth than the lower half of the construction channel). It is worth mentioning that the construction method is still applicable to the case that the depth of the lower half construction channel does not exceed the depth of the existing pile foundation of the upper building structure 1, and only under the condition, the traditional method can be directly used without performing twice excavation of the upper half construction channel and the lower half construction channel.
Step six: referring to fig. 6, the bottom of the whole construction channel is constructed as the pile foundation underpinning structure at the bottom of the newly-built tunnel, and the underpinning pile 9 is used as the basic framework to be constructed as the other part of the pile foundation underpinning structure at the two side parts of the newly-built tunnel; the pile foundation underpinning structure used as the bottom of the newly-built tunnel comprises a pouring base 11, which can be poured and formed firstly, and the pouring base 11 is connected with the underpinning pile 9; the other part of the pile foundation underpinning structure at the two side parts of the newly-built tunnel comprises pouring side walls 12 which can be formed by pouring after pouring a base 11, wherein the pouring side walls 12 are connected with the underpinning piles 9 and the pouring base 11, specifically, the pouring side walls 12 are longitudinal walls which wrap the underpinning piles 9, or the pouring side walls 12 are longitudinal walls connected between the underpinning piles 9, so that the newly-built tunnel is basically formed, a hollow box body structure is formed by the underpinning cross beams 6 and the pouring top plates 7 at the top part, the underpinning piles 9 and the pouring side walls 12 at the two side parts, and the pouring base 11 at the bottom part, and the temporary plugging wall 4 can also be removed.
Step seven: referring to fig. 7, the outer side of the newly-built tunnel is subjected to waterproofing and backfilling treatment in the whole construction channel, the outer surface of the newly-built tunnel is subjected to waterproofing treatment, and the temporary enclosure 13, the upper building structure 1 and the interval area among the newly-built tunnel are backfilled by plain concrete 14.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments, and any variations or modifications may be made to the embodiments of the present invention without departing from the principles.
Claims (10)
1. A pile foundation underpinning construction method suitable for a tunnel underpinning building is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
the method comprises the following steps: arranging a working well on the adjacent side of the upper building structure, and arranging a construction platform in the working well;
step two: excavating an upper half construction channel below the upper building structure, wherein the depth of the upper half construction channel is less than that of an existing pile foundation of the upper building structure;
step three: constructing a pile foundation underpinning structure at the top of the newly-built tunnel in the upper half construction channel, and constructing two rows of underpinning piles in the stratum corresponding to the lower half construction channel which is not excavated, wherein the underpinning piles belong to one part of the pile foundation underpinning structure at two side parts of the newly-built tunnel;
step four: pouring a underpinning pile extension section for connecting a pile foundation underpinning structure and an underpinning pile serving as the top of the newly-built tunnel between the underpinning pile and the underpinning structure;
step five: continuously excavating a lower half construction channel corresponding to the upper half construction channel and cutting off the existing pile foundation in the lower half construction channel;
step six: constructing a pile foundation underpinning structure at the bottom of the newly-built tunnel at the bottom of the whole construction channel, and constructing another part of the pile foundation underpinning structure at two side parts of the newly-built tunnel by taking underpinning piles as a basic framework;
step seven: and performing waterproofing and backfilling treatment on the outer side of the newly-built underground passage in the whole construction passage.
2. The underpinning construction method of pile foundation suitable for the building under tunnel according to claim 1, characterized by comprising the following steps: in the third step, the underpinning structure used as the pile foundation at the top of the newly-built tunnel comprises underpinning cross beams and a pouring top plate, the underpinning cross beams are the bearing parts at the top of the tunnel connected between the existing pile foundations of the upper building structure, and the pouring top plate is the bearing parts at the top of the tunnel connected between the underpinning cross beams.
3. The underpinning construction method of pile foundation suitable for the building under tunnel according to claim 1, characterized by comprising the following steps: and in the third step, the pile foundation underpinning structure serving as the top of the newly-built tunnel is fixedly connected with the working well.
4. The underpinning construction method of pile foundation suitable for the building under tunnel according to claim 1, characterized by comprising the following steps: in the fourth step, the part of the existing pile foundation exposed in the upper half construction channel is cut off in advance.
5. The underpinning construction method of pile foundation suitable for the building under tunnel according to claim 1, characterized by comprising the following steps: and fifthly, the depth of the lower half construction channel is smaller than that of the underpinned pile.
6. The underpinning construction method of pile foundation suitable for the building under tunnel according to claim 1, characterized by comprising the following steps: and step six, the underpinning structure serving as the pile foundation at the bottom of the newly-built tunnel comprises a pouring base, and the pouring base is connected with the underpinning pile.
7. The underpinning construction method of pile foundation suitable for the building under tunnel according to claim 1, characterized by comprising the following steps: and step six, the other part of the underpinning structure of the pile foundation at the two side parts of the newly-built tunnel comprises a pouring side wall, and the pouring side wall is connected with the underpinning pile and a pouring base.
8. The underpinning construction method of pile foundation suitable for the building under tunnel according to claim 7, characterized by comprising the following steps: the pouring side wall is a longitudinal wall body which wraps the underpinning piles, or the pouring side wall is a longitudinal wall body which is connected between the underpinning piles.
9. The underpinning construction method of pile foundation suitable for the building under tunnel according to claim 1, characterized by comprising the following steps: and in the second step and the fifth step, temporary enclosure construction is carried out on two sides of the construction channel.
10. The underpinning construction method of pile foundation suitable for the building under tunnel according to claim 1, characterized by comprising the following steps: in the first step and the second step, the table top of the construction platform is flush with the bottom surface of the upper half construction channel to be excavated.
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| CN202110709528.6A CN113356291B (en) | 2021-06-25 | 2021-06-25 | Pile foundation underpinning construction method suitable for tunnel underpass building |
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| CN202110709528.6A CN113356291B (en) | 2021-06-25 | 2021-06-25 | Pile foundation underpinning construction method suitable for tunnel underpass building |
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| CN113356291A true CN113356291A (en) | 2021-09-07 |
| CN113356291B CN113356291B (en) | 2023-05-12 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03158574A (en) * | 1989-11-17 | 1991-07-08 | Toda Constr Co Ltd | Construction of new building capable of operating existing structure |
| CN110905014A (en) * | 2019-12-10 | 2020-03-24 | 中建八局第二建设有限公司 | Construction structure and construction method for underpinning pile foundation |
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2021
- 2021-06-25 CN CN202110709528.6A patent/CN113356291B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03158574A (en) * | 1989-11-17 | 1991-07-08 | Toda Constr Co Ltd | Construction of new building capable of operating existing structure |
| CN110905014A (en) * | 2019-12-10 | 2020-03-24 | 中建八局第二建设有限公司 | Construction structure and construction method for underpinning pile foundation |
Non-Patent Citations (1)
| Title |
|---|
| 李少波: "厦门地铁3号线车站下穿商业街桩基托换优化设计", 《福建建筑》 * |
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