CN117328470A - Deep foundation pit basement cover excavation sequential construction method and structure thereof - Google Patents
Deep foundation pit basement cover excavation sequential construction method and structure thereof Download PDFInfo
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- CN117328470A CN117328470A CN202311337349.XA CN202311337349A CN117328470A CN 117328470 A CN117328470 A CN 117328470A CN 202311337349 A CN202311337349 A CN 202311337349A CN 117328470 A CN117328470 A CN 117328470A
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- 238000010276 construction Methods 0.000 title claims abstract description 79
- 238000009412 basement excavation Methods 0.000 title claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 33
- 239000010959 steel Substances 0.000 claims abstract description 33
- 239000004567 concrete Substances 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims description 19
- 238000005266 casting Methods 0.000 claims description 18
- 239000002689 soil Substances 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
- 230000000295 complement effect Effects 0.000 claims description 2
- 239000011150 reinforced concrete Substances 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 66
- 238000009415 formwork Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/0007—Base structures; Cellars
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Abstract
The invention discloses a deep foundation pit basement cover excavation sequential construction method and a structure thereof, wherein the deep foundation pit basement cover excavation sequential construction method comprises a supporting structure, a basement side wall and a floor slab, and the bottom of the floor slab is also provided with a girder which is used for supporting the floor slab; a reserved space is arranged between the edge of the floor slab and the supporting structure, and the reserved space is used for entering a basement for next-layer construction; an auxiliary beam is further arranged in the reserved space between the floor slab and the supporting structure, and the edge of the auxiliary beam is connected with the steel pipe concrete piles of the floor slab and the supporting structure. Only the floor slab structure of the main structure is completed, the basement side wall and the bottom plate are sequentially subjected to forward construction after the foundation pit is seen at the bottom, the supporting structure adopts the floor slab structure of the building main body, and the floor slab of the basement structure is used for replacing the supporting structure, so that the construction period and the cost for installing and detaching the traditional reinforced concrete inner support of the foundation pit are saved. Can effectively solve the problem of water seepage of the side wall of the basement, cancel the internal support, reduce the construction waste at the same time, and is favorable for environmental protection.
Description
Technical Field
The invention relates to a deep foundation pit basement construction technology, in particular to a deep foundation pit basement cover excavation sequential construction method and a deep foundation pit basement cover excavation sequential construction structure.
Background
With the development of urban construction, the urban land area is reduced year by year, the development of underground space shows a small and deep trend, the conventional method of the multi-layer basement support structure is to support the structure by using piles, and more projects cannot adopt anchor cables to carry out transverse drawknot due to the influence of surrounding environment, so that an internal support scheme becomes a preferred scheme more and more.
When the inner support is selected for construction, firstly, the support pile, the upright pile and the pile foundation are constructed, the first reinforced concrete inner support is constructed, then the earthwork is excavated below the second reinforced concrete support, the second reinforced concrete support is constructed, and the earthwork and the support are sequentially and alternately carried out until the foundation pit bottom. And then constructing a basement: floor-N layer wall post roof, N-1 layer wall post roof.
The scheme adopts the internal support, the support beam has long installation and disassembly period, complex working procedures and difficult disassembly and transportation of waste materials; the area of the foundation pit is small, the cost is high, the later dismantling is very inconvenient, and the construction period is influenced; and the supporting structure has long exposure time, the deformation of the periphery of the foundation pit is larger, the surrounding environment is not protected, and the fund time cost is high. Sometimes, although the reverse construction method is adopted, for years, as the reverse construction method is used for constructing the basement layer by layer from top to bottom, cracks tend to occur at the joint surface, the waterproof effect of the side wall of the basement is poor, the water leakage phenomenon of the side wall of the basement occurs, and the construction requirement cannot be met.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a deep foundation pit basement cover excavation sequential construction method and a structure thereof, wherein the deep foundation pit basement cover excavation sequential construction method adopts a floor slab as a support to excavate and construct a basement foundation pit sequentially.
The technical scheme adopted for solving the technical problems is as follows: the deep foundation pit basement cover excavation sequential construction method comprises the following steps:
step one: constructing a supporting structure and an engineering pile;
step two: excavating earthwork of a first layer of foundation pit;
step three: hoisting a first layer of main beams, casting corresponding support waist beams, extending the main beams to the support waist beams, and casting an added auxiliary beam according to the support design;
step four: excavating the earthwork of the second layer foundation pit, hoisting a second layer main beam and an auxiliary beam at the bottom of the first layer floor, and pouring the second layer floor;
step five: continuing to excavate and support according to the excavation modes of the first layer and the second layer until the designed elevation is excavated;
step six: constructing a bearing platform and a bottom plate of the basement side wall, and connecting the positions with post-pouring belts by adopting profile steel;
step seven: performing layered construction casting on the basement side wall, and simultaneously, performing complementary casting on the reserved peripheral floor slab, wherein the reserved peripheral floor slab and the basement side wall are formed by one-step casting;
step eight: and finishing the waterproof construction and the later backfilling of the basement side wall.
As an improvement of the technical scheme, when the floor slab is laid in the third step, the fourth step and the fifth step, the floor slab is only poured to the position of the basement side wall of the building, the girder steel bars extend to the basement side wall of the foundation pit, and the steel bars are reserved on the girder and the auxiliary girder.
As a further improvement of the technical scheme, the reserved steel bars are basement side wall steel bars and floor steel bars, hanging bars are also arranged on the main beams and the auxiliary beams, and the hanging bars are used for hanging and fixing templates when the next floor of floor template is installed.
As an improvement of the technical scheme, in the third, fourth and fifth steps, when the first layer of main beam is constructed, the main beams of the residual layer are hung at the bottom of the first layer of main beam, when the second layer of main beam is constructed, the main beams of the residual layer are hung at the bottom of the second layer of main beam, and the construction and the hanging of the residual floor slab are sequentially carried out according to the hanging modes of the first layer and the second layer.
As a further improvement of the technical scheme, in the third, fourth and fifth steps, when the girder floor slab is laid, a soil outlet hole for entering the next layer and discharging soil for excavating the next layer is reserved.
As an improvement of the technical scheme, the lower part of the middle upright post in the first step is an original designed concrete pile, and the upper part is a concrete-filled steel tube concrete column covered with concrete.
As an improvement of the technical scheme, after the underground one-layer structure is completed, the overground structure and the underground foundation pit and earth construction are synchronously carried out.
As a further improvement of the technical scheme, in the seventh step, the basement side wall is formed by layered casting from the bottommost part to the upper layer of the foundation pit in the construction process, and the outer wall reinforcing steel bars are connected with the reserved bars at the intersections of the main beams, the auxiliary beams and the auxiliary beams which extend outwards in the casting process.
The deep foundation pit basement cover excavation sequential construction structure comprises a supporting structure, a basement side wall and a floor slab, wherein the bottom of the floor slab is also provided with a main beam, and the main beam is used for supporting the floor slab; the main beam is arranged in the range of the supporting structure, a reserved space is arranged between the edge of the floor slab and the supporting structure, and the reserved space is used for entering the next layer of construction of the basement; an auxiliary beam is further arranged in the reserved space between the floor slab and the supporting structure, and the edge of the auxiliary beam is connected with the steel pipe concrete piles of the floor slab and the supporting structure.
As an improvement of the above technical solution, the auxiliary beams include an edge auxiliary beam and a supporting auxiliary beam, the edge auxiliary beam is disposed around the floor slab and connected with the floor slab, and the supporting auxiliary beam is disposed between the edge auxiliary beam and the supporting structure and connected with the edge auxiliary beam and the supporting structure.
The beneficial effects are that: the supporting structure of the cover excavation forward construction method adopts the floor structure of the building main body, and the floor slab, the main beam and the auxiliary beam of the basement structure replace the supporting structure, so that the method is combined into a whole, and the construction period and the cost for installing and detaching the support in the reinforced concrete of the traditional foundation pit are saved. The construction method only completes the floor slab structure of the main structure, and the basement side wall and the bottom plate are sequentially and forward constructed after the foundation pit is at the bottom, so that the problem of water seepage of the basement side wall can be effectively solved, and meanwhile, in order to better solve the effective connection between the basement side wall and the floor slab, the later stage of the floor slab except the side span auxiliary beam is synchronously poured with the basement side wall. The inner support is canceled, and meanwhile, the construction waste is reduced, so that the environment protection is facilitated. Meanwhile, the water seepage phenomenon caused by poor construction joint gaps and waterproof effects of the traditional reverse construction method basement side wall due to reverse concrete pouring is also overcome.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic flow chart of the present invention;
fig. 2 is a schematic structural view of the present invention.
1. A support structure; 2. a main beam; 3. an auxiliary beam; 4. a floor slab; 5. a basement side wall; 6. and reserving a space.
Detailed Description
The conception, specific structure, and technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention. In addition, all the coupling/connection relationships referred to in the patent are not direct connection of the single-finger members, but rather, it means that a better coupling structure can be formed by adding or subtracting coupling aids depending on the specific implementation. The technical features in the invention can be interactively combined on the premise of no contradiction and conflict.
Referring to fig. 2, a deep foundation pit basement cover excavation sequential construction structure comprises a supporting structure 1, a basement side wall 5 and a floor slab 4, wherein the supporting structure 1 mainly comprises steel pipe concrete piles penetrating into the ground, and a plurality of concrete (underground continuous wall) piles enclose a basement construction foundation. Floor 4 is arranged between layers of the multi-layer basement structure, and main beams 2 and auxiliary beams 3 are further arranged at the bottom of the floor 4. The main beams 2 and the auxiliary beams 3 extend to the range of the supporting structure 1, a reserved space 6 is arranged between the edge of the floor slab 4 and the supporting structure 1, and the reserved space 6 is used for entering the next layer of construction of the basement. The synchronous setting of girder 2 and floor 4 is in the floor 4 under the condition of not being connected with basement side wall 5, supporting construction 1, and girder 2 can be used to the support of floor 4, and does not influence the construction of reserving next floor basement in the airborne.
In order to ensure the stability of the supporting structure 1 and the effective connection of the basement side wall 5 and the floor 4 in the construction process, an auxiliary beam 3 is further arranged in a reserved space 6 between the floor 4 and the supporting structure 1, and the edge of the auxiliary beam 3 is connected with the floor 4 and the steel pipe concrete piles of the supporting structure 1. The auxiliary beams 3 arranged between the edges of the floor slabs 4 and the supporting structure 1 strengthen the supporting force between the floor slabs 4 and the supporting structure 1, and enhance the stability of the floor slabs 4. And the auxiliary beam 3 comprises an edge auxiliary beam 3 and a supporting auxiliary beam 3, wherein the edge auxiliary beam 3 is arranged around the floor slab 4 and is connected with the floor slab 4, and the auxiliary beam 3 which is connected with the floor slab 4 around the edge of the floor slab 4 is connected with the floor slab 4 more firmly. The support auxiliary beam 3 is arranged between the edge auxiliary beam 3 and the support structure 1 and is connected with the two. The supporting auxiliary beams 3 are provided with a plurality of auxiliary beams 3, and the auxiliary beams 3 are respectively arranged at positions between two adjacent main beams 2. In the reserved space 6 between the edge of the floor slab 4 and the supporting structure 1, the gap between the main beams 2 is mainly used for the construction of the structure of the next layer of basement, so that in order to ensure the smoothness of the construction of the structure of the next layer of basement, gaps which are arranged between the main beams 2 in the reserved space 6 and are enough for the construction of the structure of the next layer of basement are reserved, and meanwhile, the auxiliary beams 3 are uniformly arranged, so that the stability of the supporting force of the auxiliary beams 3 to the floor slab 4 in the reserved space 6 is ensured, and the stability and reliability of the wall after the floor slab 4 is connected with the basement side wall 5 can be ensured.
Referring to fig. 1, a deep foundation pit basement cover excavation sequential construction method adopting the construction structure comprises the following steps:
step one: constructing a supporting structure 1 and engineering piles to finish the supporting of a foundation, wherein the supporting structure is a supporting pile or a continuous wall; the engineering pile is a middle upright post, the lower part of the middle upright post is an original designed concrete pile, the original designed concrete pile is similar to the existing concrete pile in structure, the upper part of the middle upright post is a concrete-filled steel tube concrete column wrapped with concrete, concrete with corresponding labels can be poured into a steel tube of the steel tube concrete pile, and the steel tube is inserted into the concrete pile to a certain depth, so that the bearing capacity requirement of upper load is met.
Step two: excavating earthwork of a first layer of foundation pit, and excavating the foundation pit layer by layer according to the sequence from top to bottom;
step three: hoisting a first layer of main beams 2 and auxiliary beams 3, pouring a first layer of main beam floor 4, pouring corresponding support waist beams, extending the main beams 2 to the support waist beams, adding the auxiliary beams 3 according to the support design, and reserving basement side wall steel bars and floor steel bars at all beams at the position where the floor is not poured; and a certain number of hanging bars are distributed on the main beam 2 and the auxiliary beam 3, so that the formwork can be lifted and fixed when the next floor slab 4 is installed, the formwork can adopt an aluminum mould, and the upper layer of the formwork can slide to the position of the next layer of the formwork when the upper layer of the formwork is removed. Because the common practice needs to be firstly made into the floor slab and then excavated in the next layer, in order to reserve the excavated space, the edge is not connected with the basement side wall 5 during pouring of the floor slab, and the construction space is reserved. Meanwhile, in order to ensure the stability of the floor slab 4 which is not connected with the basement side wall 5, an auxiliary beam 3 which is connected with the edge of the floor slab and drives is also arranged in the range between the floor slab 4 and the supporting structure 1, the diameter of the auxiliary beam 3 is smaller than that of the main beam 2, and the auxiliary beam 3 is inserted in the gap of the main beam 2, so that the stability of the floor slab is ensured, and the construction gap between the floor slab and the basement side wall 5 is reserved;
step four: and excavating the earthwork of the second layer of foundation pit, wherein after the integral structure of the underground first layer is completed, the overground structure can be synchronously carried out with the construction of the second layer of foundation pit and the earthwork. Hanging ribs are reserved at the bottoms of the first layer main beams 2 and the auxiliary beams 3 and used for hanging templates of the second layer auxiliary beams 3, so that sinking deformation of the second layer floor 4 during pouring is reduced;
step five: continuing to excavate and support according to the excavation modes of the first layer and the second layer until the designed elevation is excavated;
step six: constructing a bearing platform and a bottom plate of the basement side wall 5, connecting the position with the post-pouring zone by adopting profile steel, and completing cast-in-situ of the bearing platform and the bottom plate of the basement at the bottom of a foundation pit, and constructing an upper structure above the ground by constructing the bottom plate;
step seven: the basement side wall 5 can be formed by layered casting from the bottommost part to the upper layer of the foundation pit during construction, so that the concrete casting at the joint is pressure casting, and the outer wall reinforcing steel bars are connected with the reserved bars at the intersections of the main beam, the auxiliary beam and the auxiliary beam which extend outwards. Simultaneously, the reserved peripheral floor slabs are complemented and cast with the side wall of the basement at one time;
step eight: and finishing the waterproof construction and the later backfilling of the basement side wall.
When the floor slab 4 is paved, the main beam 2 and the auxiliary beam 3 are hoisted firstly, and the floor slab is convenient to level by adopting a hoisting mode. When digging the foundation pit, because of the diversification of the underground structure layer, different terrains are easy to exist, and when leveling and floor laying are carried out on the dug plane, the floor is easy to be influenced by the terrains or foundation pit deformation, so that the floor is difficult to be in a standard horizontal plane. The hoisting mode is adopted to level on the hoisting structure arranged on the ground, so that the leveling of the ground and the hoisting structure is easier and more accurate compared with the foundation pit just excavated.
During hoisting, the mechanical properties of the main beam 2 and the auxiliary beam 3 floor slab need to be considered during main body structural design, so that the bearing capacity of the floor slab is ensured to completely meet the requirements of support and later use. And when the main beam 2 and the auxiliary beam 3 are hoisted, both ends of the beams are directly connected to the side edges of the excavated foundation pit. And after the main beam 2 and the auxiliary beam 3 are lifted, pouring the floor slab 4, wherein the floor slab 4 is only poured to the position of the auxiliary beam of the basement side wall 5 of the building, and extends to the main beam 2 and the auxiliary beam 3 of the basement side wall 5 of the foundation pit and the longitudinal auxiliary beam to reserve the reinforcing steel bars of the basement side wall 5 and the reinforcing steel bars of the floor slab 4.
The reserved steel bars are basement side wall 5 steel bars and floor slab steel bars, the reserved basement side wall 5 steel bars and floor slab steel bars are convenient to connect with the basement side wall 5 after the panel casting is completed, the integration of the whole structure is guaranteed, and the waterproof performance of the structure is improved.
When the panel of the first layer is poured, the next layer of the closed foundation pit can be covered and dug, and as the cover and dug method adopts the integral pouring of the surface layer floor and then the downward earth digging construction when the basement is constructed, the noise in the construction is greatly reduced due to the obstruction of the surface layer floor, thereby avoiding the delay of construction period due to the noise problem in the night construction.
The common foundation treatment adopts an open excavation means, and a large amount of building dust is generated, so that the image of the city is influenced; the cover-excavation forward construction method is adopted, and because the construction operation is under the closed ground surface, dust emission can be reduced to the greatest extent, and the environmental protection performance of the construction is improved.
Of course, in order to enable excavation of the lower foundation pit and laying of the lower floor 4 when the girder 2 floor 4 is laid, a soil outlet hole is reserved for entering the next floor and discharging soil for the next excavation. And when carrying out first layer girder 2 construction, in order to guarantee the levelness that bottom girder 2 and auxiliary girder 3 were installed, can hoist and mount in the bottom of first layer girder 2 at the girder 2 of the first layer of surplus layer 2 after upper layer girder 2 and auxiliary girder 3 hoist and mount are accomplished. And when the second-layer main beam 2 is constructed, the main beam 2 of the residual layer is hoisted at the bottom of the second-layer main beam 2, and the construction and hoisting of the residual floor slab are sequentially carried out according to the hoisting modes of the first layer and the second layer. Therefore, the panels of the rest floors can be lifted and leveled, and the first-layer panels which are lifted horizontally can be used as the standard when leveling, so that the lifting is convenient, and the levelness of the panels of the rest floors can be ensured.
The engineering pile is a steel pipe concrete column with concrete covered outside, the steel pipe concrete column structure is used for replacing the upright pile, and meanwhile, the engineering pile also serves as a main body structure column, so that the problem that the inner support is independently arranged and detached after construction is completed is further avoided. After the bottom plate of the basement side wall 5 is finished, the basement side wall 5 is sequentially cast from bottom to top in a layering manner according to a normal sequential process, and then the outer waterproof and the basement side wall 5 fertilizer groove backfilling are constructed, so that the integrity of the basement side wall 5 is ensured, and the waterproof performance of the whole structure in use is ensured.
In some municipal works or deep foundation pit works with high protection requirements, the site is often tense, and the periphery of the foundation pit is closely adjacent to important buildings or underground structures or pipelines. The underground diaphragm wall of the basement side wall 5 can be tightly attached to the planned red line under the condition of meeting the arrangement of outdoor pipelines or structures by adopting the cover excavation forward construction method, and even the underground diaphragm wall constructed by stepping on the planned red line can be used as a permanent outer wall of the basement. Thereby achieving the purpose of utilizing the underground space to the maximum extent and expanding the building area of the basement.
After the underground one-layer structure is completed, the overground structure and the underground foundation pit and earthwork construction are synchronously carried out. The cover-excavation forward construction method can realize the closure of the floor slab in a short period, so that the construction site can be used freely, and the orderly implementation of the project which cannot be implemented by the conventional process is achieved. Because the cover-digging forward method adopts the surface layer support and the bottom construction operation method, the method is very useful in urban traffic civil engineering, and can carry out the road underground operation under the condition that the ground road continues to be in traffic, thereby avoiding the loss caused by traffic jam detouring.
The cover excavation forward method is adopted, the floor layer floor 4 structure is finished firstly, and the structure can be used for internal support. Since the lateral stiffness of the structure itself is infinite and the compression set value is almost zero with respect to the set requirements of the fender post. Therefore, the lateral deformation of the support pile can be fundamentally solved, so that the problems of pavement subsidence, foundation subsidence and the like caused by overlarge deformation values are avoided in the surrounding environment, the safety of surrounding buildings is ensured, and the influence on adjacent buildings, roads and underground pipelines is greatly reduced.
While the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope of the present invention as defined in the appended claims.
Claims (10)
1. A deep foundation pit basement cover excavation sequential construction method is characterized by comprising the following steps of: the method comprises the following steps:
step one: constructing a supporting structure and an engineering pile;
step two: excavating earthwork of a first layer of foundation pit;
step three: hoisting a first layer of main beams, casting corresponding support waist beams, extending the main beams to the support waist beams, and casting an added auxiliary beam according to the support design;
step four: excavating the earthwork of the second layer foundation pit, hoisting a second layer main beam and an auxiliary beam at the bottom of the first layer floor, and pouring the second layer floor;
step five: continuing to excavate and support according to the excavation modes of the first layer and the second layer until the designed elevation is excavated;
step six: constructing a bearing platform and a bottom plate of the basement side wall, and connecting the positions with post-pouring belts by adopting profile steel;
step seven: performing layered construction casting on the basement side wall, and simultaneously, performing complementary casting on the reserved peripheral floor slab, wherein the reserved peripheral floor slab and the basement side wall are formed by one-step casting;
step eight: and finishing the waterproof construction and the later backfilling of the basement side wall.
2. The deep foundation pit basement cover excavation forward construction method according to claim 1, wherein the method comprises the following steps: and in the third, fourth and fifth steps, when the floor slab is paved, the floor slab is only poured to the position of the side wall of the basement of the building, the girder steel bars extend to the side wall of the basement of the foundation pit, and steel bars are reserved on the girder and the auxiliary girder.
3. The deep foundation pit basement cover excavation forward construction method according to claim 2, wherein the method comprises the following steps: the reserved steel bars are basement side wall steel bars and floor steel bars, hanging bars are also arranged on the main beams and the auxiliary beams, and the hanging bars are used for hanging and fixing templates when the next floor of floor template is installed.
4. The deep foundation pit basement cover excavation forward construction method according to claim 2, wherein the method comprises the following steps: and in the third, fourth and fifth steps, when the first layer of main girder is constructed, the main girders of the residual layer are hung at the bottom of the first layer of main girder, and when the second layer of main girder is constructed, the main girders of the residual layer are hung at the bottom of the second layer of main girder, and the construction and the hanging of the residual floor are sequentially carried out according to the hanging modes of the first layer and the second layer.
5. The deep foundation pit basement cover excavation forward construction method according to claim 1, wherein the method comprises the following steps: and in the third, fourth and fifth steps, when the girder floor slab is paved, a soil outlet hole which enters the next layer and discharges soil for excavating the next layer is reserved.
6. The deep foundation pit basement cover excavation forward construction method according to claim 1, wherein the method comprises the following steps: the lower part of the middle upright post in the first step is an original designed concrete pile, and the upper part of the middle upright post is a concrete-filled steel tube concrete column covered with concrete.
7. The deep foundation pit basement cover excavation forward construction method according to claim 1, wherein the method comprises the following steps: after the underground one-layer structure is completed, the overground structure and the underground foundation pit and earthwork construction are synchronously carried out.
8. The deep foundation pit basement cover excavation forward construction method according to claim 1, wherein the method comprises the following steps: and in the seventh step, the basement side wall is formed by layered casting from the bottommost part to the upper layer of the foundation pit, and the outer wall reinforcing steel bars are connected with the reserved ribs at the intersections of the main beams, the auxiliary beams and the auxiliary beams which extend outwards during casting.
9. The utility model provides a deep basal pit basement lid digs in same direction as construction structure which characterized in that: the floor comprises a supporting structure, a basement side wall and a floor slab, wherein the bottom of the floor slab is also provided with a main beam which is used for supporting the floor slab; the main beam is arranged in the range of the supporting structure, a reserved space is arranged between the edge of the floor slab and the supporting structure, and the reserved space is used for entering the next layer of construction of the basement; an auxiliary beam is further arranged in the reserved space between the floor slab and the supporting structure, and the edge of the auxiliary beam is connected with the steel pipe concrete piles of the floor slab and the supporting structure.
10. The deep foundation pit basement cover excavation forward construction structure of claim 9, wherein: the auxiliary beams comprise edge auxiliary beams and supporting auxiliary beams, wherein the edge auxiliary beams are arranged around the floor and connected with the floor, and the supporting auxiliary beams are arranged between the edge auxiliary beams and the supporting structure and connected with the edge auxiliary beams and the supporting structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311337349.XA CN117328470A (en) | 2023-10-16 | 2023-10-16 | Deep foundation pit basement cover excavation sequential construction method and structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311337349.XA CN117328470A (en) | 2023-10-16 | 2023-10-16 | Deep foundation pit basement cover excavation sequential construction method and structure thereof |
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