CN112982442A - Construction method for foundation pit deformation caused by insufficient rigidity of supporting system - Google Patents
Construction method for foundation pit deformation caused by insufficient rigidity of supporting system Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
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- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The invention discloses a construction method for foundation pit deformation caused by insufficient rigidity of a supporting system, and relates to the technical field of foundation engineering. The construction sequence of the construction method for foundation pit deformation caused by insufficient rigidity of the support system is that construction is carried out from the corners of the foundation pit, then construction is carried out on the areas between the corners of the foundation pit, and finally construction is carried out on the middle area, so that the foundation pit deformation is controlled to the maximum extent; the construction method for foundation pit deformation caused by insufficient rigidity of the support system solves the problem of foundation pit deformation caused by insufficient rigidity of the support system in a stress state by changing the construction method and the construction sequence, and simultaneously ensures the construction safety, quality and construction period of foundation engineering.
Description
Technical Field
The invention relates to the technical field of foundation engineering, in particular to a construction method for foundation pit deformation caused by insufficient rigidity of an inner support and support system in a soft soil area.
Background
With the high-speed development of urban construction and the development and utilization of underground space, foundation pit engineering is increasing; the foundation pit engineering refers to comprehensive engineering such as foundation pit excavation, precipitation, support, soil body reinforcement and the like in the construction of building foundation engineering or other underground engineering, and the deep foundation pit engineering is called when the excavation depth of the foundation pit is generally more than or equal to 5 m; the foundation pit supporting refers to a pit wall supporting structure and an anchor supporting system which are arranged in the process of foundation pit excavation, has the functions of retaining soil and stopping water, saving construction land, protecting surrounding environment or being used as an external wall structure of an underground space of a building and the like, and mainly comprises steel sheet pile supporting, underground continuous walls, column type cast-in-place pile row pile supporting, inner supporting and anchor rod supporting, soil nailing wall supporting, deep layer stirring cement soil pile supporting and the like.
In the construction process of deep foundation pit excavation, soil bodies inside and outside a foundation pit are changed from an original static soil pressure state to a passive soil pressure state and an original active soil pressure state, the change of a stress state causes a building enclosure to bear load and leads to the deformation of the building enclosure and the soil bodies, any value of the internal force (the internal force of the building enclosure and a wall, the supporting axial force or the anchoring tension force and the like) and the deformation (the uplift of the soil body in the deep foundation pit and the settlement and horizontal displacement of the surrounding soil body) of the building enclosure exceeds an allowable range, the instability and the damage of the foundation pit or the adverse effect on the surrounding environment are caused, the excavation engineering of the deep foundation pit is often in an area with dense buildings, buildings and underground pipelines are arranged around a construction site, the deformation of the soil body caused by the excavation of the foundation pit changes the normal states of the buildings and the underground pipelines to a certain extent, and when the deformation of the soil body is overlarge, the failure; therefore, when a dangerous deformation situation occurs in the excavation process of the foundation pit, the conventional method is a construction method of reinforcing a supporting structure or adopting basin-type excavation to construct an intermediate area firstly and horizontally bracing on a main structure while setting a span, so that the cost is high, the construction period is delayed, a construction method for solving the problem of foundation pit deformation caused by insufficient rigidity of a supporting system is needed, and the construction safety quality and the construction period of foundation engineering are ensured.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a construction method for foundation pit deformation caused by insufficient rigidity of an inner support and support system in a soft soil area, which solves the problem that the foundation pit deformation caused by insufficient rigidity of the support system in a stress state and ensures the construction quality and the construction period of foundation engineering.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a construction method for foundation pit deformation caused by insufficient rigidity of a supporting system comprises the steps of constructing from the corners of the foundation pit, constructing the areas between the corners of the foundation pit, and constructing the middle area, so that the foundation pit deformation is controlled to the maximum extent.
Another object of the present invention is to provide a construction method for foundation pit deformation caused by insufficient rigidity of an internal support system in a soft soil area, which comprises the following steps:
step 1, treating corner parts of foundation pit
Excavating construction from the corner of the foundation pit by utilizing the characteristics of dense support beams, high support rigidity and small deformation at the corner of the inner support, pouring basic raft plates on four corners of the foundation pit after the corner of the foundation pit is excavated to the bottom, backfilling the basic raft plates and the edges of the foundation pit with concrete to form supports, and continuously constructing the-2F basement structure in the area;
step 2, longitudinal treatment between corners of the foundation pit
After foundation raft plates are poured at the corners of the foundation pits and concrete is backfilled to form supports, two-span construction is longitudinally dug between the corners of the two foundation pits, the two-span foundation raft plates are poured, the foundation raft plates and the foundation pit edge fertilizer grooves are also backfilled with concrete to form supports, and the-2F basement structure in the area is continuously constructed;
step 3, transverse processing between two foundation pit corners
After foundation raft plates are poured at the corners of the foundation pits and concrete is backfilled to form supports, two-span construction is transversely dug between the corners of the two foundation pits, the two-span foundation raft plates are poured, the foundation raft plates and the sides of the foundation pits are also backfilled with concrete to form supports, and the-2F basement structure in the area is continuously constructed;
step 4, treating the middle body part of the foundation pit
Excavating and constructing the middle part of the foundation pit after the transverse and longitudinal construction treatment of the corner part of the foundation pit and the corner part of the foundation pit is finished, pouring a basic raft plate at the middle part, and continuously constructing a-2F basement structure in the area;
step 5, replacing supports after basement construction is finished to a bottom plate of a negative layer
When the basement is integrally constructed to the bottom plate with the first floor, concrete or soil stones are backfilled at the positions of the shear wall and the fertilizer groove at the edge of the foundation pit, the support plates are arranged at the bottom plate with the first floor, the inner support supporting beams are dismantled, the basement is constructed according to normal procedures, the fertilizer groove of the foundation pit is backfilled, and the construction of the upper main structure is completed.
Furthermore, when the support is replaced in the step 5, the support is detached firstly through the corner supports, then the diagonal supports and the circular ring supports are detached, and finally the main diagonal support in the middle is detached.
The invention has the beneficial effects that:
according to the construction method for foundation pit deformation caused by insufficient rigidity of the inner support and support system in the soft soil area, the construction sequence is that the construction is carried out from the corners of the foundation pit, then the construction is carried out on the areas between the corners of the foundation pit, and finally the construction is carried out on the middle area, so that the foundation pit deformation is controlled to the utmost extent;
according to the construction method for foundation pit deformation caused by insufficient rigidity of the inner support and support system in the soft soil area, the characteristics that support beams at inner support corners are dense, the rigidity of the support beams is high, and the deformation is small are utilized, the construction is firstly carried out from the corners of the foundation pit, the foundation raft is poured, the backfilling fertilizer grooves form the supports, the foundation raft and the support beams form a space frame structure, and the deformation of the foundation pit in the area is limited, so that the deformation length of the sides of the foundation pit is greatly shortened, namely the length of the foundation pit is shortened, the space effect of the deformation of the foundation pit is reduced, and; constructing a side-by-side two-span foundation raft between two angular points, backfilling the fertilizer grooves to form supports, effectively controlling the deformation of the whole foundation pit, constructing the foundation raft in the middle area to form a whole, constructing the basement, disassembling and replacing the supports, and forming a new force transmission system at the periphery of the basement;
the construction method for foundation pit deformation caused by insufficient rigidity of the support system solves the problem of foundation pit deformation caused by insufficient rigidity of the support system in a stress state by changing the construction method and the construction sequence, and simultaneously ensures the construction quality and the construction period of foundation engineering.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a construction method for foundation pit deformation caused by insufficient rigidity of a supporting system according to an embodiment of the invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A construction method for foundation pit deformation caused by insufficient rigidity of an inner support supporting system in a soft soil area comprises the following steps of constructing from the corners of the foundation pit, constructing the areas between the corners of the foundation pit, and constructing the middle area, so that the foundation pit deformation is controlled to the maximum extent.
Example 2
As shown in fig. 1, a construction method for foundation pit deformation caused by insufficient rigidity of an internal support and support system in a soft soil area comprises the following steps:
step 1, treating corner parts of foundation pit
Excavating construction from the corner of the foundation pit by utilizing the characteristics of dense support beams, high support rigidity and small deformation at the corner of the inner support, pouring basic raft plates on four corners of the foundation pit after the corner of the foundation pit is excavated to the bottom, backfilling the basic raft plates and the edges of the foundation pit with concrete to form supports, and continuously constructing the-2F basement structure in the area;
step 2, longitudinal treatment between corners of the foundation pit
After foundation raft plates are poured at the corners of the foundation pits and concrete is backfilled to form supports, two-span construction is longitudinally dug between the corners of the two foundation pits, the two-span foundation raft plates are poured, the foundation raft plates and the foundation pit edge fertilizer grooves are also backfilled with concrete to form supports, and the-2F basement structure in the area is continuously constructed;
step 3, transverse processing between two foundation pit corners
After foundation raft plates are poured at the corners of the foundation pits and concrete is backfilled to form supports, two-span construction is transversely dug between the corners of the two foundation pits, the two-span foundation raft plates are poured, the foundation raft plates and the sides of the foundation pits are also backfilled with concrete to form supports, and the-2F basement structure in the area is continuously constructed;
step 4, treating the middle body part of the foundation pit
Excavating and constructing the middle part of the foundation pit after the transverse and longitudinal construction treatment of the corner part of the foundation pit and the corner part of the foundation pit is finished, pouring a basic raft plate at the middle part, and continuously constructing a-2F basement structure in the area;
step 5, replacing supports after basement construction is finished to a bottom plate of a negative layer
When the basement is integrally constructed to the bottom plate with the first floor, concrete or soil stones are backfilled at the positions of the shear wall and the fertilizer groove at the edge of the foundation pit, the support plates are arranged at the bottom plate with the first floor, the inner support supporting beams are dismantled, the basement is constructed according to normal procedures, the fertilizer groove of the foundation pit is backfilled, and the construction of the upper main structure is completed.
And 5, when the support is replaced in the step 5, the support is detached firstly, then the diagonal support and the circular ring support are detached, and finally the middle main diagonal support is detached.
Example 3
The Jinhui financial center project is invested, developed and constructed by Yunnan city investment industry limited company, wherein foundation pit supporting engineering is undertaken by my department. The area of a foundation pit of the proposed project is about 26861.1 square meters, the perimeter is 651m, and the excavation depth is 4.2 m-9.9 m. The foundation pit supporting adopts a single row of supporting piles (phi 600, phi 800 and phi 1000mm) and 1 reinforced concrete inner support (ring support 1150 x 800mm and support 700 x 700mm) enclosing structure;
in the process of earth excavation after the construction of the inner support is completed, obvious downward deflection deformation (overlarge column distance and midspan deflection deformation) of the support beam in the middle of the inner support is found, and conference negotiation processing schemes are held by each participating unit under the condition, and after the conference negotiation processing schemes are confirmed together with the original design unit, a reinforcing scheme is adopted for a support system.
The specific operation is as follows:
firstly, utilizing the characteristics of dense supporting beams at the corner of an inner supporting point, large supporting rigidity and small deformation, excavating and constructing from the corner of a foundation pit, pouring a basic raft plate on the four corners of the foundation pit after the corner of the foundation pit is excavated to the bottom, backfilling and tamping the basic raft plate and the edge of the foundation pit with concrete to form a support, constructing from the corner of the foundation pit, pouring the basic raft plate, backfilling a fertilizer tank to form a support, forming the basic raft plate and the supporting beams into a space frame structure, and limiting the deformation of the foundation pit in the area, so that the length of the deformation of the edge of the foundation pit is greatly shortened, which is equivalent to the shortening of the length of the foundation pit, the space effect of the deformation;
secondly, after foundation raft plates are poured at the corners of the foundation pits and concrete is backfilled to form supports, longitudinal excavation construction is carried out between the two corners of the foundation pits, the foundation raft plates are poured, and the foundation raft plates and the sides of the foundation pits are also backfilled by the concrete to form the supports;
then, after foundation raft plates are poured at the corners of the foundation pits and concrete is backfilled to form supports, transversely excavating and constructing between the corners of the two foundation pits, pouring the foundation raft plates, and backfilling the concrete on the foundation raft plates and the sides of the foundation pits to form the supports; the side-by-side two-span basic raft between two angular points and the back-filled fertilizer groove form a support, so that the deformation of the whole foundation pit is effectively controlled,
after the transverse and longitudinal construction treatment of the corner parts of the foundation pit and the corner parts of the foundation pit is completed, the middle part of the foundation pit is excavated and constructed, a foundation raft plate at the middle part is poured, finally, the foundation raft plate at the middle construction area forms a whole, a basement is constructed, supports are disassembled and replaced, and a force transmission system is formed at the periphery of the basement.
According to the construction method for foundation pit deformation caused by insufficient rigidity of the inner support and support system in the soft soil area, disclosed by the invention, the problem of foundation pit deformation caused by insufficient rigidity of the support system in a stress state is solved by changing the construction method and the construction sequence, and meanwhile, the construction quality and the construction period of foundation engineering are ensured.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (4)
1. A construction method for foundation pit deformation caused by insufficient rigidity of a supporting system is characterized by comprising the following steps: the construction sequence is that the construction is carried out from the corners of the foundation pit, then the construction is carried out on the areas between the corners of the foundation pit, and finally the construction is carried out on the middle area, so that the deformation of the foundation pit is controlled to the utmost extent.
2. The construction method for the deformation of the foundation pit caused by the insufficient rigidity of the internal support and support system in the soft soil area according to claim 1 is characterized by comprising the following steps of:
step 1, treating corner parts of foundation pit
Excavating construction from the corner of the foundation pit by utilizing the characteristics of dense support beams, high support rigidity and small deformation at the corner of the inner support, pouring basic raft plates on four corners of the foundation pit after the corner of the foundation pit is excavated to the bottom, backfilling the basic raft plates and the edges of the foundation pit with concrete to form supports, and continuously constructing the-2F basement structure in the area;
step 2, longitudinal treatment between corners of the foundation pit
After foundation raft plates are poured at the corners of the foundation pits and concrete is backfilled to form supports, two-span construction is longitudinally dug between the corners of the two foundation pits, the two-span foundation raft plates are poured, the foundation raft plates and the foundation pit edge fertilizer grooves are also backfilled with concrete to form supports, and the-2F basement structure in the area is continuously constructed;
step 3, transverse processing between two foundation pit corners
After foundation raft plates are poured at the corners of the foundation pits and concrete is backfilled to form supports, two-span construction is transversely dug between the corners of the two foundation pits, the two-span foundation raft plates are poured, the foundation raft plates and the sides of the foundation pits are also backfilled with concrete to form supports, and the-2F basement structure in the area is continuously constructed;
step 4, treating the middle body part of the foundation pit
Excavating and constructing the middle part of the foundation pit after the transverse and longitudinal construction treatment of the corner part of the foundation pit and the corner part of the foundation pit is finished, pouring a basic raft plate at the middle part, and continuously constructing a-2F basement structure in the area;
step 5, replacing supports after basement construction is finished to a bottom plate of a negative layer
When the basement is integrally constructed to the bottom plate with the first floor, concrete or soil stones are backfilled at the positions of the shear wall and the fertilizer groove at the edge of the foundation pit, the support plates are arranged at the bottom plate with the first floor, the inner support supporting beams are dismantled, the basement is constructed according to normal procedures, the fertilizer groove of the foundation pit is backfilled, and the construction of the upper main structure is completed.
3. The construction method for foundation pit deformation caused by insufficient rigidity of the internal support and support system in the soft soil area according to claim 2, is characterized in that: and 5, when the support is replaced in the step 5, the support is detached firstly, then the diagonal support and the circular ring support are detached, and finally the middle main diagonal support is detached.
4. The application of the construction method for foundation pit deformation caused by insufficient rigidity of the supporting and protecting system according to claim 1 in construction when the foundation pit deformation is large due to insufficient rigidity of the supporting and protecting system in a soft soil area.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114277830A (en) * | 2022-01-21 | 2022-04-05 | 中国建筑第八工程局有限公司 | Construction process of raft foundation of oversized equipment |
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| CN202989933U (en) * | 2012-12-11 | 2013-06-12 | 同济大学建筑设计研究院(集团)有限公司 | Structure for controlling deformation of cylindrical foundation pit subjected to open excavation and sequential construction in soft soil area |
| CN103541364A (en) * | 2013-10-10 | 2014-01-29 | 上海申元岩土工程有限公司 | Design and construction method of large area foundation pit deformation control with roundabout method |
| CN104631465A (en) * | 2014-12-15 | 2015-05-20 | 上海市基础工程集团有限公司 | Deep foundation pit excavation construction method adopted under pebble bed red sandstone geological condition |
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2021
- 2021-03-22 CN CN202110303913.0A patent/CN112982442A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102979102A (en) * | 2012-12-11 | 2013-03-20 | 同济大学建筑设计研究院(集团)有限公司 | Open-excavation sequential-operation deformation-control design method for deep and large circular foundation ditch in soft soil areas |
| CN202989933U (en) * | 2012-12-11 | 2013-06-12 | 同济大学建筑设计研究院(集团)有限公司 | Structure for controlling deformation of cylindrical foundation pit subjected to open excavation and sequential construction in soft soil area |
| CN103541364A (en) * | 2013-10-10 | 2014-01-29 | 上海申元岩土工程有限公司 | Design and construction method of large area foundation pit deformation control with roundabout method |
| CN104631465A (en) * | 2014-12-15 | 2015-05-20 | 上海市基础工程集团有限公司 | Deep foundation pit excavation construction method adopted under pebble bed red sandstone geological condition |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114277830A (en) * | 2022-01-21 | 2022-04-05 | 中国建筑第八工程局有限公司 | Construction process of raft foundation of oversized equipment |
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