CN111335670A - Method for constructing foundation pit and newly adding underground structure in situ under existing reserved building - Google Patents

Method for constructing foundation pit and newly adding underground structure in situ under existing reserved building Download PDF

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Publication number
CN111335670A
CN111335670A CN202010191884.9A CN202010191884A CN111335670A CN 111335670 A CN111335670 A CN 111335670A CN 202010191884 A CN202010191884 A CN 202010191884A CN 111335670 A CN111335670 A CN 111335670A
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CN
China
Prior art keywords
bearing
constructing
foundation pit
existing
building
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010191884.9A
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Chinese (zh)
Inventor
贾坚
付斌
朱雁飞
谢小林
沈晓明
翟杰群
潘伟强
杨科
诸颖
郭晓航
高伟
王茂东
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Mingyue Architectural Design Office Co ltd
Architecture Design and Research Institute of Tongji University Group Co Ltd
Shanghai Tunnel Engineering Co Ltd
Original Assignee
Shanghai Mingyue Architectural Design Office Co ltd
Architecture Design and Research Institute of Tongji University Group Co Ltd
Shanghai Tunnel Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Mingyue Architectural Design Office Co ltd, Architecture Design and Research Institute of Tongji University Group Co Ltd, Shanghai Tunnel Engineering Co Ltd filed Critical Shanghai Mingyue Architectural Design Office Co ltd
Priority to CN202010191884.9A priority Critical patent/CN111335670A/en
Publication of CN111335670A publication Critical patent/CN111335670A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/06Separating, lifting, removing of buildings; Making a new sub-structure
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/32Foundations for special purposes
    • E02D27/48Foundations inserted underneath existing buildings or constructions
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/045Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
    • E02D29/05Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
    • E02D29/055Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel

Abstract

The invention relates to a method for constructing a foundation pit in situ below an existing reserved building, which comprises the following steps: constructing a vertical bearing force member into a soil layer around the existing reserved building; constructing a working well at the periphery of the vertical bearing component, and constructing a bearing beam in the working well, wherein the bearing beam is positioned below the existing reserved building; connecting the bearing beam with the vertical bearing force member through a conversion beam, so that a stress system is transmitted to the vertical bearing force member from the bearing beam through the conversion beam; and excavating a peripheral part of a foundation pit downwards in the working well in a layered manner around the existing reserved building, excavating a soil layer below the bearing beam and the conversion beam, and finally forming the foundation pit. The invention can not cause any damage to the existing reserved buildings, and can provide stable support and effective protection; the foundation pit can be directly constructed on a large scale under the reserved building, and the requirement on the area of the operation site is not high.

Description

Method for constructing foundation pit and newly adding underground structure in situ under existing reserved building
Technical Field
The invention relates to the field of building construction, in particular to a method for constructing a foundation pit and a newly added underground structure in situ under an existing reserved building.
Background
Existing reserved buildings (including history reserved buildings, cultural buildings, buildings in the protected landscape areas and other types of buildings which cannot be dismantled) are important carriers of city history, art and culture, so that the urban buildings are more and more valued by urban managers; meanwhile, with the development of cities, underground spaces are also more fully developed. In the development and construction of the underground space of modern cities, the organic combination of the existing reserved building and the newly added underground structure is emphasized, so that the use function of the existing reserved building which is long in the past can be improved by means of the development of the underground space, and the existing reserved building can meet the requirement of the development of the times. How to realize the development and utilization of underground space on the basis of reserving buildings is an increasingly prominent problem in the current urban construction.
There are several main ways to develop underground space under existing buildings in the past:
1. the disassembling method comprises the following steps: and if the existing building is not the reserved building, directly dismantling the original building and then building an underground structure. The method is the same as the construction of a foundation pit on the open ground, the process is mature, and the manufacturing cost is lower. But this method cannot be applied if the existing building belongs to a history reserved building, a cultural relic building, a building of a feature protected area, and other types of existing reserved buildings that cannot be dismantled.
2. A translation method: and if the site conditions allow, translating the existing building to other places, then newly building an underground structure on the open space of the original site of the building, and translating the existing building back to the original site after the newly built underground structure is completed. The method can integrally reserve the original building, but the premise is that enough fields are required to be reserved near the original site of the building for translation operation. If the translation of the existing reserved buildings with four sides tightly attached to a red land line has insufficient empty space or the translation turnover cost of the existing reserved buildings is too high, the method is not applicable.
3. Traditional in-situ underpinning: the method adopts a static pressure anchor rod pile to underpin an original building foundation, and then a foundation pit is dug under the static pressure anchor rod pile. The method has the following limitations: because the indoor clearance of the original building is low, the indoor space can only be used for operating small equipment such as a static pressure anchor rod pile, a small excavator and the like, and large equipment needs to be operated outdoors; especially in saturated soft soil areas, when a foundation pit is deep, necessary large-scale equipment for deep foundation pit construction such as underground continuous wall grooving equipment, large-scale steel reinforcement cage hoisting equipment, a long-arm excavator and the like is often needed, the process equipment cannot be constructed in the internal space of an existing building, so that the operation must be carried out on an empty space beside the existing building, meanwhile, a deep foundation pit enclosure structure such as an underground continuous wall and the like must be arranged on the outer side of the existing building, a large-scale excavator, an earth moving vehicle and the like must be arranged outside the existing building room, otherwise, the foundation pit cannot be implemented below the building, and therefore, the method is difficult to solve the problem of insufficient construction operation field when facing a large area of the existing reserved building; in addition, the underpinning method still inevitably damages the original building bottom plate structure.
The above construction methods either remove part of the original building structure for external reinforcement or remove the floor bottom plate for forced underpinning, which can not avoid destroying all or part of the components in the original building and damage to the floor.
Disclosure of Invention
In view of the above, it is necessary to provide a method for constructing a foundation pit in situ under an existing building and newly adding an underground structure, in order to solve the problems that a large work site is required to be reserved around the existing building and a ground floor needs to be damaged when an underground space is developed under the existing building.
A method of constructing a foundation pit in situ below an existing retaining structure, comprising:
constructing a vertical bearing force member into a soil layer around the existing reserved building;
constructing a working well at the periphery of the vertical bearing component, and constructing a bearing beam in the working well, wherein the bearing beam is positioned below the existing reserved building;
connecting the bearing beam with the vertical bearing force member through a conversion beam, so that a stress system is transmitted to the vertical bearing force member from the bearing beam through the conversion beam;
and excavating a peripheral part of a foundation pit downwards in the working well in a layered manner around the existing reserved building, excavating a soil layer below the bearing beam and the conversion beam, and finally forming a complete foundation pit.
The method for constructing the foundation pit in situ under the existing reserved building at least has the following beneficial technical effects:
(1) the bearing beam below the existing reserved building can be used for bearing the load of the existing reserved building, the underpinning beam is used for transmitting the load borne by the bearing beam to the vertical bearing force member, the bearing beam transmits the stress system to the vertical bearing force member through the conversion beam, and finally the vertical bearing force member bears the weight of the whole existing reserved building and transmits the load to the underground. The bearing structure below the existing building is reserved to have enough supporting strength for supporting the building, and the floor of the existing building is not required to be broken for carrying out stress underpinning, so that the floor of the existing building is not damaged; the structure in the original building does not need to be removed, so that the components in the building are not damaged, the existing reserved building is not damaged, and stable support and effective protection can be provided.
(2) After the foundation pit is excavated, a larger construction operation space is provided below the bearing beam and the conversion beam, and a part of large-scale equipment can be arranged below the bearing beam and the conversion beam, so that the foundation pit is constructed on a large scale directly below the reserved building. Because the space below the bearing beam and the conversion beam is large, the operation requirement can be met only by reserving a small-area operation field beside the existing reserved building, the requirement on the field area is not high, and the construction mode is more flexible and convenient.
(3) Compared with a translation method, the existing reserved building does not need to be translated, and compared with a traditional in-situ underpinning method, the existing reserved building does not need to be jacked, so that the existing reserved building does not need to be moved, the construction difficulty and cost are greatly reduced, the construction efficiency is improved, and the method is very suitable for implementing the construction of a large-scale foundation pit and the underground space development under the existing reserved building.
In one embodiment, the vertical bearing component comprises a plurality of vertical bearing columns, and the vertical bearing columns are distributed on two sides of the existing reserved building in the length direction.
In one embodiment, in the step of constructing the vertical bearing members into the soil layer around the existing reserved building, when the existing reserved building is located at the edge of a foundation pit, the arrangement density of the vertical bearing columns close to the side line of the foundation pit is greater than that of the vertical bearing columns far away from the side line of the foundation pit.
In one embodiment, a plurality of the carrier beams are arranged in parallel, and a plurality of the vertical carrier columns located on the same side are connected to each of the carrier beams through one of the transfer beams.
In one embodiment, the vertical load-bearing column includes one of a cast-in-place pile, a bite pile, an underground continuous wall, a construction method pile, a steel pipe pile, and a precast pile.
In one embodiment, the load beam is perpendicular to the transfer beam.
In one embodiment, the working well comprises two well bodies which are respectively arranged at two sides of the existing reserved building.
In one embodiment, the constructing a load beam in the working well comprises: and constructing the bearing beam from the well body on one side to the well body on the other side, or respectively constructing the bearing beam from the two well bodies in an opposite direction.
In one embodiment, the load beam comprises a steel pipe, a steel section or a reinforced concrete prefabricated member.
In one embodiment, the interior of the load beam is pre-filled with concrete or placed with steel bars or inserted steel bars.
In one embodiment, the transfer beam comprises a cast in place concrete beam.
The invention provides a method for adding an underground structure below an existing reserved building, which comprises the method for constructing a foundation pit in situ below the existing reserved building; and constructing an underground structure in the formed foundation pit.
The method for newly adding the underground structure below the existing reserved building at least has the following beneficial technical effects:
(1) the bearing structure below the existing building is reserved to have enough supporting strength for supporting the building, and the floor of the existing building is not required to be broken for carrying out stress underpinning, so that the floor of the existing building is not damaged; the structure in the original building does not need to be removed, so that the components in the building are not damaged, the existing reserved building is not damaged, and stable support and effective protection can be provided.
(2) A larger construction operation space is provided below the bearing beam and the conversion beam, so that the operation requirement can be met only by reserving a small-area operation field beside the existing reserved building, the requirement on the field area is not high, and the construction of a newly-added underground structure is more flexible and convenient. Because the existing reserved building does not need to be translated or jacked, the existing reserved building does not need to be moved any more, the construction difficulty and the cost are greatly reduced, the construction efficiency is improved,
in one embodiment, the underground structure is formed by a cover and dig forward or reverse method.
Drawings
FIG. 1 is a schematic diagram of a method for constructing a foundation pit in situ under an existing reserved building according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view A-A of the step of constructing vertical load bearing members into the soil layer of the method of FIG. 1;
FIG. 3 is a cross-sectional view A-A of the method of FIG. 1 during a step of constructing a worksite and a load beam in the worksite;
FIG. 4 is a cross-sectional view A-A of the method of FIG. 1 illustrating the step of connecting the load beam to the vertical load bearing member via the transfer beam;
FIG. 5 is a sectional view A-A of the method of FIG. 1 during a step of excavating a pit down around the existing retaining structure in a tiered manner;
FIG. 6 is a schematic diagram of a method for constructing a foundation pit in situ under an existing reserved building according to a second embodiment of the present invention;
fig. 7 is a cross-sectional view B-B of the method of fig. 6 excavating a pit down in the first well body to form a foundation pit.
In fig. 1-5, 10, existing retaining structure, 20, pit, 21, perimeter, 22, pit edge,
100. vertical load bearing members, 110, vertical load bearing columns,
210. a first well body, 220, a second well body,
300. the load-bearing beam is provided with a load-bearing beam,
400. the beam is converted into a beam body,
500. the large-scale equipment is a piece of equipment,
in fig. 6-7, 10', existing retaining structure, 20', foundation pit, 21', perimeter portion, 22', foundation pit border line,
100', vertical load bearing members, 110', vertical load bearing columns,
210', a first well body, 220', a second well body,
300 'of the load-bearing beam, 300',
400' of the first and second beams, a transfer beam,
500', large scale plant.
Detailed Description
The invention will be further explained with reference to the drawings.
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Those of ordinary skill in the art will recognize that variations and modifications of the various embodiments described herein can be made without departing from the scope of the invention, which is defined by the appended claims. Moreover, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 5, in a first embodiment of the present invention, there is provided a method for constructing a foundation pit in situ under an existing reserved building, including:
(1) constructing a vertical bearing force member 100 into a soil layer around the existing reserved building 10;
(2) constructing a working well at the periphery of the vertical bearing member 100, and constructing a bearing beam 300 in the working well, wherein the bearing beam 300 is positioned below the existing reserved building 10;
(3) connecting the load-bearing beam 300 with the vertical load-bearing member 100 through the transfer beam 400, so that a stress system is transmitted from the load-bearing beam 300 to the vertical load-bearing member 100 through the transfer beam 400;
(4) the peripheral portion 21 of the foundation pit 20 is excavated downward in the working well in layers around the existing remaining construction 10, and the soil layer is excavated under the carrier beams 300 and the transfer beams 400, thereby finally forming the complete foundation pit 20.
In this embodiment, the carrier beam 300 under the existing reserved building 10 can be used to carry the load of the existing reserved building 10, the underpinning beam is used to transmit the load borne by the carrier beam 300 to the vertical load-bearing member 100, the stress system is transmitted from the carrier beam 300 to the vertical load-bearing member 100 through the transfer beam 400, and finally the vertical load-bearing member 100 carries the weight of the existing reserved building 10 as a whole and transmits the load to the ground. The bearing structure below the existing building 10 is reserved to have enough supporting strength for supporting the building, and the floor of the existing building is not required to be broken for carrying out stress underpinning, so that the floor of the existing building is not damaged; there is no need to remove the structure from the original building so that the elements in the building are not damaged, and thus there is no damage to the existing remaining building 10 and stable support and effective protection can be provided.
After the foundation pit 20 is excavated, a large construction work space is provided below the carrier beam 300 and the transfer beam 400, and a part of large equipment 500 can be arranged below the carrier beam 300 and the transfer beam 400, so that the foundation pit 20 can be constructed on a large scale directly below the reserved building 10. Because the space below the carrier beam 300 and the transfer beam 400 is large, the operation requirement can be met only by reserving a small-area operation field beside the existing reserved building 10, the requirement on the operation field is not high, and the construction mode is more flexible and convenient.
Compared with a translation method, the existing reserved building 10 does not need to be translated, and compared with a traditional in-situ underpinning method, the existing reserved building 10 does not need to be jacked, so that the existing reserved building 10 does not need to be moved, the construction difficulty and cost are greatly reduced, the construction efficiency is also improved, and the method is very suitable for construction and underground space development of a large-scale foundation pit 20 implemented below the existing reserved building 10.
Referring to fig. 1 and 2, in this embodiment, the vertical load-bearing member 100 in step (1) specifically includes a plurality of vertical load-bearing columns 110, and is distributed on both sides of the existing retaining building 10 in the length direction. The vertical load-bearing columns 110 distributed on both sides of the existing reserved building 10 in the length direction can uniformly bear the overall weight of the existing reserved building 10, so that the existing reserved building 10 is supported comprehensively and stably, and the safety of the existing reserved building 10 during construction is guaranteed.
Specifically, the vertical bearing column 110 is used as a vertical member for bearing the load of the existing reserved building 10, and may be in the structural forms of a cast-in-place pile, an occlusive pile, an underground continuous wall, a pile in an operating method, a steel pipe pile, a precast pile and the like, and all have high strength and support performance, and can stably support and support the existing reserved building 10. Of course, the vertical load post 110 may also take other configurations, and is not limited herein.
In the invention, a sufficient distance needs to be ensured between the adjacent vertical bearing columns 110 to meet the requirement that the large-scale equipment 500 freely passes through the two vertical bearing columns 110 during the foundation pit construction operation in the subsequent step (4).
In the first embodiment, with continued reference to fig. 1, a plurality of load beams 300 are arranged side by side, and a plurality of vertical load-bearing columns 110 located on the same side are connected to each load-bearing beam 300 through a transfer beam 400. In this embodiment, the two transfer beams 400 are adopted to connect the carrier beam 300 and each vertical carrier post 110, and the structure forms a whole, so that the deformation is not easy to occur, and the stability is better.
As a preference, the load beam 300 is perpendicular to the transfer beam 400. The integral shape of the cross-connected load beam 300 and the transfer beam 400 is stable, and the load bearing capacity is stronger; the arrangement is standard, and the construction operation is convenient.
Referring to fig. 1 and 3, the working well of step (2) includes two well bodies respectively disposed at both sides of the existing retaining structure 10. Specifically, the two side wells are respectively the first well 210 and the second well 220, the two wells can be synchronously constructed and simultaneously excavated to form the peripheral part 21 of the foundation pit 20, so as to improve the construction efficiency, and compared with the single side arrangement, the occupation area of each side well in the double side arrangement can be further reduced, thereby further reducing the requirements for the operation site.
As shown in fig. 3, in step (2) of the first embodiment, a load beam 300 is constructed from the first well 210 to the second well 220. In other embodiments, the load-bearing beam 300 can be oppositely constructed from two well bodies, and the construction method is flexible and is not limited herein.
The load-bearing beam 300 used in the first embodiment may be a steel pipe, a section steel or a reinforced concrete prefabricated member. In order to further improve the bearing capacity, the interior of the load-bearing beam 300 may be pre-filled with concrete or placed with steel bars, and steel bars may be directly inserted into the load-bearing beam 300, and these structures disposed inside the load-bearing beam 300 may enhance the rigidity and bending resistance of the load-bearing beam 300, thereby improving the bearing capacity and ensuring the construction safety.
When the carrier bar 300 has a water stopping requirement, the water stopping function can be realized by adopting the modes of soil body reinforcement, water stopping structure arrangement, freezing method and the like. When the load-bearing capacity of the load-bearing beam 300 is required to be high, the load-bearing beam 300 can be stacked in multiple rows to improve the load-bearing capacity.
As shown in fig. 4, the transfer beam 400 in step (3) includes a cast-in-place concrete beam. The cast-in-place concrete beam has a large bearing capacity, and after the cast-in-place concrete beam is solidified to reach a pre-designed strength, the vertical stress underpinning of the existing reserved building 10 is completed, and at the moment, large equipment 500 is operated on the periphery and below the existing reserved building 10 along a foundation pit side line 22 to excavate the foundation pit 20 according to design requirements, as shown in fig. 5.
After the foundation pit 20 is formed, a subterranean space is simultaneously excavated downward in the first and second well bodies 210 and 220. In some embodiments, the underground structure is formed using a cover and dig forward or reverse approach. The cover-excavation method refers to that after the foundation pit 20 is excavated to the base, the underground structure is constructed from the lowest surface of the foundation pit 20 to the surface of the base. The reverse construction method is to excavate the main body of the foundation pit 20 and construct the underground structure, i.e., one layer of construction is excavated until the construction of the lowest layer of the underground structure is completed.
Of course, in other embodiments, the underground structure is formed using an undercut or other method, and is not limited thereto.
In a second embodiment, which provides an alternative method of constructing a foundation pit in situ beneath an existing retaining structure, existing retaining structure 10 'is positioned at the edge of foundation pit 20', as shown in fig. 6. The specific construction operation method of the second embodiment is basically the same as the steps (1) to (4) of the first embodiment, and the difference is that: in the step (1), the vertical bearing capacity member 100 'is constructed into the soil layer around the existing reserved building 10', the arrangement density of the vertical bearing columns 110 'close to one side of the foundation pit side line 22' is greater than that of the vertical bearing columns 110 'far away from the foundation pit side line 22', because the existing reserved building 10 of the first embodiment is positioned inside the foundation pit 20, and the vertical bearing capacity member 100 is designed mainly by considering the load transmitted by the existing reserved building 10 at the upper part and the foundation thereof; when the existing reserved building 10 'is located at the edge of the foundation pit 20', the vertical bearing force member 100 'also needs to be used as a foundation pit enclosure structure to provide strength support for the foundation pit 20', so that the vertical bearing force member should be designed and considered as the foundation pit enclosure structure to bear water and soil loads, the arrangement density of the vertical bearing columns 110 'close to the edge of the foundation pit is high, and the existing reserved building 10' and the surrounding water and soil loads can be supported at the same time.
In addition, since the existing reserved building 10' is close to the edge of the foundation pit 20', the floor area of the second well body 220' is small, so that the bearing beam 300' can be constructed in the first well body 210' only in the step (2); and as shown in fig. 7, in the step (4), when the foundation pit 20' is excavated, the large equipment 500' can only excavate the peripheral portion 21' of the foundation pit 20' downward in the first well body 210', and excavate a soil layer under the carrier beam 300' and the transfer beam 400', to finally form a complete foundation pit.
An underground structure may be constructed in the formed foundation pit 20 'with the vertical load bearing columns 110' located within the foundation pit 20 'serving to support the existing retaining structure 10', the vertical load bearing columns 110 'near the edge of the foundation pit 20' providing support to both the existing retaining structure 10 'and the foundation pit 20'.
The above description is intended to be illustrative of the present invention and not to limit the scope of the invention, which is defined by the claims appended hereto.
Those skilled in the art will appreciate that various features of the above-described embodiments may be omitted, added, or combined in any way, and for the sake of brevity, all possible combinations of features of the above-described embodiments will not be described, however, so long as there is no contradiction between these combinations of features, and simple variations and structural variations which are adaptive and functional to the prior art, which can occur to those skilled in the art, should be considered within the scope of this description.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that while the present invention has been shown and described with reference to various embodiments, it will be understood by those skilled in the art that various changes and modifications in form and detail may be made without departing from the spirit of the invention and these are within the scope of the invention as defined by the appended claims. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (13)

1. A method for constructing a foundation pit in situ below an existing reserved building is characterized by comprising the following steps:
constructing a vertical bearing force member into a soil layer around the existing reserved building;
constructing a working well at the periphery of the vertical bearing component, and constructing a bearing beam in the working well, wherein the bearing beam is positioned below the existing reserved building;
connecting the bearing beam with the vertical bearing force member through a conversion beam, so that a stress system is transmitted to the vertical bearing force member from the bearing beam through the conversion beam;
and excavating a peripheral part of a foundation pit downwards in the working well in a layered manner around the existing reserved building, excavating a soil layer below the bearing beam and the conversion beam, and finally forming a complete foundation pit.
2. The method of constructing a foundation pit in situ below an existing retaining structure as claimed in claim 1, wherein said vertical load bearing members comprise a plurality of vertical load bearing columns distributed on both sides of the existing retaining structure in the length direction.
3. The method of in situ constructing a foundation ditch under an existing retaining structure of claim 2, wherein in the step of constructing vertical load bearing members into the soil layer around the existing retaining structure, when the existing retaining structure is located at the edge of the foundation ditch, the arrangement density of the vertical load bearing columns near the side line of the foundation ditch is greater than the arrangement density of the vertical load bearing columns far away from the side line of the foundation ditch.
4. The method of constructing a foundation pit in situ under an existing retaining structure as claimed in claim 2, wherein a plurality of said carrier beams are juxtaposed and a plurality of said vertical carrier columns on the same side are connected to each of said carrier beams by one of said transfer beams.
5. The method of constructing a foundation pit in situ below an existing retaining structure of claim 2, wherein the vertical load-bearing column comprises one of a cast-in-place pile, an occlusive pile, an underground continuous wall, a construction method pile, a steel pipe pile, and a precast pile.
6. The method of constructing a foundation pit in situ under an existing retaining structure of claim 1, wherein the load beam is perpendicular to the transfer beam.
7. The method of constructing a foundation pit in situ below an existing retaining structure of claim 1, wherein the working well comprises two well bodies respectively disposed on both sides of the existing retaining structure.
8. The method of constructing a foundation pit in situ under an existing retaining structure of claim 7, wherein constructing a load beam in the workstring comprises: and constructing the bearing beam from the well body on one side to the well body on the other side, or respectively constructing the bearing beam from the two well bodies in an opposite direction.
9. The method of constructing a foundation pit in situ under an existing retaining structure of claim 1, wherein the carrier beam comprises steel pipe, steel section or reinforced concrete precast element.
10. The method for constructing a foundation pit in situ under an existing retaining structure as claimed in claim 1, wherein the interior of the load beam is pre-filled with concrete or placed with steel bars or inserted with steel sections.
11. The method of constructing a foundation pit in situ below an existing retaining structure of claim 1, wherein the transfer beam comprises a cast-in-place concrete beam.
12. A method of adding a new underground structure to the underside of an existing retaining structure, comprising the method of constructing a foundation pit in situ beneath an existing retaining structure as claimed in any one of claims 1 to 11; and
and building an underground structure in the formed foundation pit.
13. A method of retrofitting an underground structure below an existing retaining building according to claim 12 wherein the underground structure is formed using either a cover and dig forward or reverse approach.
CN202010191884.9A 2020-03-18 2020-03-18 Method for constructing foundation pit and newly adding underground structure in situ under existing reserved building Pending CN111335670A (en)

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* Cited by examiner, † Cited by third party
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