CN113356291B - Pile foundation underpinning construction method suitable for tunnel underpass building - Google Patents
Pile foundation underpinning construction method suitable for tunnel underpass building Download PDFInfo
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- CN113356291B CN113356291B CN202110709528.6A CN202110709528A CN113356291B CN 113356291 B CN113356291 B CN 113356291B CN 202110709528 A CN202110709528 A CN 202110709528A CN 113356291 B CN113356291 B CN 113356291B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
A pile foundation underpinning construction method suitable for a tunnel underpass building comprises the following steps of setting a working well and setting a construction platform in the working well; digging out an upper half construction channel; constructing a pile foundation underpinning structure serving as the top of a newly-built tunnel in the upper half construction channel, and constructing two rows of underpinning piles in a 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 the underpinning pile; digging out a lower half construction channel and removing the existing pile foundation; constructing a pile foundation underpinning structure serving as the bottom of the newly-built tunnel, and constructing another part of the pile foundation underpinning structure serving as the two side parts of the newly-built tunnel by taking the underpinning piles as a foundation framework; and performing waterproof and backfilling treatment on the outer side of the newly-built tunnel. The invention is suitable for the situation that the depth of a newly built underground passage exceeds the depth of the existing pile foundation, and solves the problem that the traditional method cannot be normally implemented under the situation.
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 underpass building.
Background
With the development of rail transit industry in recent years, subway rail transit industry is continuously entering the field of view of people. Thanks to the continuous perfection and upgrading of the underground rail transit in China, the life quality of people is greatly improved. Although the construction of the infrastructure in China is perfect at present, the situation of building under-passing is unavoidable in the construction of tunnels in subway sections. The middle and high-rise, high-rise and super high-rise buildings often need to be embedded with deeper pile foundations, so that upper load is effectively transferred to soil layers with stronger bearing capacity, and when subway tunnels are constructed, how to smoothly cut off the pile foundations under the condition of stable integral structures becomes a great difficulty of tunnel construction, and for this, pile foundation underpinning is a feasible method. The pile foundation underpinning means that a new structure is effectively connected with a pile foundation, and the 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 new pile and a new underpinning beam, the underpinned pile is an original bearing platform edge pile foundation, the new pile cap and a pile-holding pile cap, the new pile cap is positioned at the top of the new pile, and the pile-holding pile cap is positioned on the existing pile at the adjacent side of the underpinned pile; the jacking devices are respectively arranged on the newly built pile cap and the pile-holding pile cap; the new underpinning beam is connected with the original bearing platform and is positioned above the new pile. The construction method of pile foundation underpinning utilizes the existing pile and the newly-built pile as a jacking platform to carry out pile foundation underpinning, the existing pile on the adjacent side of the underpinning pile is collected, and the pile-holding pile cap of the existing pile is constructed on the existing pile on the adjacent side; and constructing a new pile, and constructing a new pile cap on the new pile.
Pile foundation underpinning is also a viable method to resolve engineering conflicts when newly built underground projects conflict with superstructure pile foundations. When the upper structure adopts the end bearing piles, the depth of the construction area of the newly built underground engineering is shallower than that of the pile foundation of the upper structure, the newly built engineering can be excavated first, the bearing capacity of the end bearing piles is still maintained at the moment, the upper structure is ensured to be complete, the construction of the support structure and the connection node between the support structure and the pile foundation is ensured to be completed, the pile foundation in the scope of the newly built engineering is cut off, and the pile foundation support process is completed. However, when the construction area of the newly built underground engineering exceeds the depth of the pile foundation of the upper structure, if the excavation of the newly built engineering is still performed, the pile foundation cannot maintain the bearing capacity of the end part, and the underpinning construction process cannot be implemented.
Disclosure of Invention
The technical aim of the invention is to provide a pile foundation underpinning construction method suitable for a tunnel underpass building, so that the pile foundation underpinning construction can be safely and stably realized on the premise of maintaining the normal use of an upper structure when the depth of a newly built underground engineering construction area exceeds the foundation depth of the upper structure pile foundation.
The specific technical scheme of the invention is as follows: a pile foundation underpinning construction method suitable for tunnel underpass building comprises the following steps,
step one: setting a working well on the adjacent side of the upper building structure, and setting a construction platform in the working well;
step two: digging an upper half construction channel below the upper building structure, wherein the depth of the upper half construction channel is smaller than that of an existing pile foundation of the upper building structure;
step three: performing construction of a pile foundation underpinning structure serving as the top of a newly-built tunnel in the upper half construction channel, and performing construction of two rows of underpinning piles in a stratum corresponding to the lower half construction channel which is not excavated, wherein the underpinning piles belong to a part of the pile foundation underpinning structure serving as two side parts of the newly-built tunnel;
step four: pouring a underpinning pile extension section for jointing 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 in the upper half construction channel;
step five: continuing to dig out a lower half construction channel corresponding to the upper half construction channel and removing the existing pile foundation positioned in the lower half construction channel;
step six: constructing a pile foundation underpinning structure serving as the bottom of the newly-built tunnel in the whole construction channel, and constructing another part of the pile foundation underpinning structure serving as the two side parts of the newly-built tunnel by taking the underpinning piles as a foundation framework;
step seven: and performing waterproof and backfilling treatment on the outer side of the newly built tunnel in the whole construction channel.
In the third step, the pile foundation underpinning structure as the top of the newly-built tunnel comprises underpinning beams and pouring top plates, wherein the underpinning beams are tunnel top bearing parts connected between existing pile foundations of the upper building structure, and the pouring top plates are tunnel top bearing parts connected between the underpinning beams.
In the third step, the pile foundation underpinning structure serving 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 to the upper half of the 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.
In the sixth step, the pile foundation underpinning structure serving as the bottom of the newly-built tunnel preferably comprises a pouring substrate, and the pouring substrate is connected with the underpinning pile.
In the sixth step, the other part of the pile foundation underpinning structure serving as 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 substrate.
Preferably, 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.
Preferably, in the second and fifth steps, temporary enclosure construction is performed on two sides of the construction channel.
Preferably, in the first and second steps, the top surface of the construction platform is flush with the bottom surface of the upper half construction channel to be excavated.
The construction method is suitable for the situation that the depth of a newly-built tunnel exceeds the depth of an existing pile foundation, and solves the problem that the traditional method cannot be normally implemented under the situation.
Drawings
FIG. 1 is a schematic view of a longitudinal (upper) and a transverse (lower) cross section of the first and second steps according to the embodiment of the present invention;
FIG. 2 is a schematic view of a longitudinal (upper) and transverse (lower) cross section of a third embodiment of the present invention;
FIG. 3 is a schematic view of a longitudinal (upper) and transverse (lower) cross section of a third embodiment of the present invention;
FIG. 4 is a schematic view of a longitudinal (upper) and transverse (lower) cross section of step four according to an embodiment of the present invention;
FIG. 5 is a schematic view of a longitudinal (upper) and transverse (lower) cross section of the fifth embodiment of the present invention;
FIG. 6 is a schematic view of a longitudinal (upper) and transverse (lower) cross section of the step six according to the embodiment of the present invention;
FIG. 7 is a schematic view of a longitudinal (upper) and transverse (lower) cross section of step seven according to an embodiment of the present invention;
the names of the parts corresponding to the numbers in the figure are respectively as follows: 1-upper building structure, 2-working well, 3-construction platform, 4-temporary plugging 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 substrate, 12-pouring side wall, 13-temporary enclosure and 14-plain concrete.
Detailed Description
The invention will be further illustrated by the following examples, taken in conjunction with the accompanying drawings:
an embodiment of a pile foundation underpinning construction method suitable for a tunnel underpass building comprises the following steps,
step one: referring to fig. 1, a working well 2 is arranged on 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, the working wells 2 are respectively arranged on two sides of the basement, one working well 2 is provided with a construction platform 3, each working well 2 is provided with a temporary plugging wall 4 (a through hole is not completely plugged with the working well 2), and the area between the temporary plugging walls 4 on two sides is a construction channel or an area where a new tunnel is formed.
Step two: referring to fig. 1, the depth of the table top of the construction platform 3 is taken as the depth of the bottom surface of the upper half construction channel to be excavated, the upper half construction channel is excavated below the upper building structure 1, the depth of the upper half construction channel is smaller than the depth of the existing pile foundation 5 of the upper building structure 1, the existing pile foundation 5 of the basement is exposed after the upper half construction channel is penetrated and excavated, the root of the pile foundation is still buried in the stratum corresponding to the lower half construction channel which is not excavated, care is taken during excavation, protection is taken during excavation, the stability of the bearing rock and soil body at the lower end of the pile foundation is ensured, if underground anchor rods exist, the bearing rock and soil body are cut off, and temporary enclosure 13 is also manufactured at the two sides of the upper half construction channel.
Step three: referring to fig. 3, construction of a pile foundation underpinning structure as a top of a new tunnel is performed in an upper half construction channel, the pile foundation underpinning structure as a top of the new tunnel includes underpinning beams 6 and pouring roof plates 7, the underpinning beams 6 are arranged along a short axis direction of the new tunnel (projection of the new tunnel in a top view) and are connected to a tunnel top bearing part between existing pile foundations 5 of the upper building structure 1; as can be seen from the cross-sectional view of fig. 3, the newly built tunnel of this example has two underpinning beams 6, one of which spans three rows of existing pile foundations 5, and the other underpinning beam 6 spans two rows of existing pile foundations 5; the pouring top plate 7 is a bearing part at the top of the tunnel connected between the underpinning beams 6, and the pouring top plate 7 is a connecting section in a space between the underpinning beams 6 where no existing pile foundation 5 exists; in order to ensure the structural strength and stability, the pile foundation underpinning structure serving as the top of the newly-built tunnel is also fixedly connected 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 load 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 yet excavated, as shown in fig. 2 and 3, the underpinning piles 9 are part of pile foundation underpinning structures serving as two sides of the newly-built tunnel, the pile foundation underpinning structures serving as two sides of the newly-built tunnel comprise the underpinning pile 9 part and the other pouring side wall 10 part in the step six, the underpinning piles 9 are also in a pouring forming mode, are embedded in the stratum corresponding to the lower half construction channel which is not yet excavated in advance, and simultaneously, the underpinning pretreatment such as roughening, bar planting and the like is carried out on the existing pile foundations 5 to be underpinned.
Step four: referring to fig. 4, a underpinning pile extension section 10 for joining the pile foundation underpinning structure as the top of the newly-built tunnel and the underpinning pile 9 is poured between the underpinning pile 9 and the underpinning beam 6 or the pouring roof 7, and the underpinning pile 9 and the underpinning pile extension section 10 are connected; after the underpinning pile extension section 10 is formed, a basic pile foundation underpinning structure system is formed, at this time, the underpinning pile 9, the underpinning beam 6 and the pouring top plate 7 have a certain bearing capacity, the existing pile foundation 5 can be replaced and removed, and at this time, the part of the existing pile foundation 5 exposed in the upper half of the construction channel can be cut off in advance, namely a cut-off section a in advance in fig. 4 can be selected.
Step five: referring to fig. 5, the lower half construction channel corresponding to the upper half construction channel is continuously excavated, the whole construction channel is formed, the depth of the lower half construction channel is smaller than the depth of the underpinning pile 9, namely, the underpinning pile 9 is buried in a stratum deeper than the whole construction channel downwards in the longitudinal direction, and a temporary enclosure 13 of the lower half construction channel is also manufactured; in this step, the existing pile foundation 5 located in the construction channel may be entirely cut off, leaving only the underpinning pile 9. The depth of the lower half of the construction path in this example is also greater than the depth of the existing pile foundation of the upper building structure 1 (the definition of depth relative to this is understood to mean that excavation of the lower half of the construction path may cause the upper building structure 1 to collapse without the underlying load, and that there may be a small number of existing pile foundations still buried in the formation, rather than an absolute total pile foundation depth less than the lower half of the construction path). It should be noted that the construction method is still applicable even when the depth of the lower half construction channel is not more than the depth of the existing pile foundation of the upper building structure 1, but generally only in this case, the conventional method is directly used without performing two excavation of the upper half construction channel and the lower half construction channel.
Step six: referring to fig. 6, the construction of the pile foundation underpinning structure serving as the bottom of the newly-built tunnel is performed at the bottom of the whole construction channel, and the construction of the other part of the pile foundation underpinning structure serving as the two side parts of the newly-built tunnel is performed by taking underpinning piles 9 as basic frameworks; the pile foundation underpinning structure used as the bottom of the newly-built tunnel comprises a pouring substrate 11, wherein the pouring substrate 11 can be poured and formed firstly, and the pouring substrate 11 is connected with the underpinning pile 9; the other part of the pile foundation underpinning structure used as two sides of the newly-built tunnel comprises pouring side walls 12, the pouring side walls 12 can be formed by pouring after pouring the substrate 11, the pouring side walls 12 are connected with the underpinning piles 9 and the pouring substrate 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 which are connected between the underpinning piles 9, so that the newly-built tunnel is basically formed, a hollow box structure is formed by the underpinning cross beam 6 at the top, the pouring top plate 7, the underpinning piles 9 at the two sides, the pouring side walls 12 and the pouring substrate 11 at the bottom, and the temporary plugging wall 4 is also detachable.
Step seven: referring to fig. 7, the outside of the new tunnel is waterproofed and backfilled in the entire construction tunnel, the outside of the new tunnel is waterproofed, and the temporary enclosure 13, the upper building structure 1, and the space area between the new tunnel are backfilled with 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 by way of example only and are not limiting. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the present invention may be modified or practiced without departing from the principles.
Claims (5)
1. A pile foundation underpinning construction method suitable for a tunnel underpass building is characterized in that: comprises the steps of,
step one: setting a working well on the adjacent side of the upper building structure, and setting a construction platform in the working well;
step two: digging an upper half construction channel below the upper building structure, wherein the depth of the upper half construction channel is smaller than that of an existing pile foundation of the upper building structure;
step three: performing construction of a pile foundation underpinning structure serving as the top of a newly-built tunnel in the upper half construction channel, and performing construction of two rows of underpinning piles in a stratum corresponding to the lower half construction channel which is not excavated, wherein the underpinning piles belong to a part of the pile foundation underpinning structure serving as two side parts of the newly-built tunnel;
step four: pouring a underpinning pile extension section for jointing the pile foundation underpinning structure serving as the top of the newly-built tunnel with the underpinning pile, wherein the underpinning pile is connected with the underpinning beam or the pouring top plate through the underpinning pile extension section;
step five: continuing to dig out a lower half construction channel corresponding to the upper half construction channel and cutting off the existing pile foundation positioned in the lower half construction channel;
step six: constructing a pile foundation underpinning structure serving as the bottom of the newly-built tunnel at the bottom of the whole construction channel, and constructing another part serving as the pile foundation underpinning structure at the two sides of the newly-built tunnel by taking underpinning piles as basic frameworks;
step seven: performing waterproof and backfilling treatment on the outer side of the newly built underground passage in the whole construction passage;
the pile foundation underpinning structure used as the top of the newly-built tunnel comprises an underpinning beam and a pouring top plate, wherein the underpinning beam is a tunnel top bearing part connected between existing pile foundations of the upper building structure, the pouring top plate is a tunnel top bearing part connected between the underpinning beams, the pile foundation underpinning structure used as the top of the newly-built tunnel is also fixedly connected with a working well, and a pouring forming mode is adopted, so that two ends of the structure extend out of a pouring connecting section to be fixedly connected with the side wall of the working well, and bearing is shared;
in the sixth step, the pile foundation underpinning structure serving as the bottom of the newly-built tunnel comprises a pouring substrate, wherein the pouring substrate is connected with the underpinning pile;
in the sixth step, the other part of the pile foundation underpinning structure serving as 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 the pouring substrate;
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.
2. The pile foundation underpinning construction method for tunnel underpass building according to claim 1, wherein: and step four, cutting off the part of the existing pile foundation exposed in the upper half construction channel in advance.
3. The pile foundation underpinning construction method for tunnel underpass building according to claim 1, wherein: and step five, the depth of the lower half construction channel is smaller than the depth of the underpinning pile.
4. The pile foundation underpinning construction method for tunnel underpass building according to claim 1, wherein: and step two and step five, carrying out temporary enclosure construction on two sides of the construction channel.
5. The pile foundation underpinning construction method for tunnel underpass building according to claim 1, wherein: in the first and second steps, the top surface of the construction platform is flush with the bottom surface of the upper half construction channel to be excavated.
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| JP2917328B2 (en) * | 1989-11-17 | 1999-07-12 | 戸田建設株式会社 | How to build a new building that can operate existing structures |
| 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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