CN110777803A - Construction method of foundation pit staged structure - Google Patents
Construction method of foundation pit staged structure Download PDFInfo
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- CN110777803A CN110777803A CN201911004096.8A CN201911004096A CN110777803A CN 110777803 A CN110777803 A CN 110777803A CN 201911004096 A CN201911004096 A CN 201911004096A CN 110777803 A CN110777803 A CN 110777803A
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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
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground 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
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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 provides a construction method of a foundation pit staged structure, wherein a row of boundary support piles are constructed in a foundation pit; sequentially constructing a first-stage structure and a second-stage structure on two sides of the row of boundary support piles to enable the first-stage structure and the second-stage structure to temporarily support against the row of boundary support piles, wherein when a floor slab at the top layer of the second-stage structure is constructed, the row of boundary support piles at the floor slab at the top layer of the second-stage structure are cut off, and the floor slab at the top layer of the second-stage structure is connected with the floor slab at the top layer of the first-stage structure to form a fully-closed floor slab; and cutting off a row of boundary support piles at the rest of the floor slabs of the secondary structure layer by layer from top to bottom, and respectively connecting the rest of the floor slabs of the secondary structure layer by layer to the floor slabs of the primary structure along with the cutting off of the boundary support piles to form the fully-closed floor slabs. The invention solves the problem of safe and reliable connection structure of concrete structures constructed in stages before and after the same foundation pit.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method of a foundation pit staged structure.
Background
With the acceleration of urban construction, land resources in central areas of cities are extremely tense, and in the construction process, special and complex peripheral environmental problems such as removal, proximity to subways and the like are more and more involved. In order to ensure that the engineering is carried out smoothly in time, a staged construction method is adopted, and particularly, during staged construction of foundation pits with different depths, higher requirements are put forward on the connection quality of concrete structures constructed in the front and rear stages and the structure safety during butt joint.
Disclosure of Invention
In order to overcome the defects in the prior art, a construction method of a foundation pit staged structure is provided so as to solve the problem that a connection structure of a concrete structure constructed in stages before and after the same foundation pit is safe and reliable.
In order to achieve the purpose, the construction method of the foundation pit staged structure comprises the following steps:
the construction method of the foundation pit staged structure has the advantages that the floor slabs are connected in a closed manner layer by layer from top to bottom to form the integral force transmission system, furthermore, the support piles are used as boundary support structures, and when the floor slabs are connected in a closed manner, parts are cut at intervals to form an effective force transmission system so as to ensure the connection quality of the structure and the safety, reliability and stability of butt joint.
Drawings
Fig. 1 to 4 are schematic step views of a construction method of a foundation pit staged structure according to an embodiment of the present invention.
Fig. 5 is a cross-sectional view taken at a-a in fig. 3.
Fig. 6 is a schematic view of the force transmission belt of the bottom floor of the secondary structure of this embodiment.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Fig. 1 to 4 are schematic step views of a construction method of a foundation pit staged structure according to an embodiment of the present invention, fig. 5 is a cross-sectional view taken at a-a in fig. 3, and fig. 6 is a schematic structural view of a force transmission belt of a floor slab at a bottom layer of a secondary structure according to this embodiment.
Referring to fig. 1 to 5, the invention provides a construction method of a foundation pit staged structure, comprising the following steps:
and S1, constructing a row of boundary support piles 1 in the foundation pit.
S2, constructing a first-stage structure 2 on the first side of the row of boundary support piles 1, and temporarily supporting the first-stage structure 2 against the first side of the row of boundary support piles 1.
And S3, constructing a secondary structure 3 on the second side of the row of boundary support piles 1 from bottom to top, so that the secondary structure 3 temporarily supports against the second side of the row of boundary support piles 1. The primary structure and the secondary structure respectively comprise a plurality of layers of floor slabs. The floor slab of the second-stage structure is arranged opposite to the floor slab of the first-stage structure. When the floor slab at the top layer of the secondary structure is constructed, a row of boundary support piles at the floor slab at the top layer of the secondary structure are cut off, and the floor slab at the top layer of the secondary structure is connected with the floor slab at the top layer of the primary structure immediately to form a fully-closed floor slab.
Specifically, the primary structure 2 and the secondary structure 3 comprise a multi-layer floor slab. The floor of the secondary structure 3 corresponds to the floor of the primary structure in position. The first stage structure is a three-layer underground structure, the second stage structure is a two-layer underground structure, and the first stage structure and the second stage structure correspond to each layer from top to bottom. In this embodiment, the primary structure includes a top floor 21, two middle floors 22, and a bottom floor 23. The secondary structure comprises a top floor 31, a middle floor 32 and a bottom floor 23.
Step S3 includes:
s31: and embedding a mixing pile 4 in the foundation on the second side of the row of boundary support piles 1.
S32: and constructing a second-stage structure 3 on the mixing piles on the second sides of the row of boundary support piles 1 from bottom to top, so that the second-stage structure 3 temporarily supports against the second sides of the row of boundary support piles 1. The mixing piles are supported on the bottom of the floor 33 of the bottom layer of the secondary structure 3.
Specifically, step S32 includes:
s321, constructing a plurality of inner supports from top to bottom between the inner wall of the foundation pit and the second side of the row of boundary support piles 1.
S322, detaching the inner support 5 in each channel from bottom to top, and constructing each floor slab at the position of the inner support 5 in each channel.
In this embodiment, the first-stage foundation pit adopts a cast-in-place pile as a surrounding structure, and the first-stage structure adopts an i-beam to transmit force to prop on the first side of the boundary supporting pile. The first-stage structure comprises an underground three-layer structure, namely a negative three-layer structure, a negative two-layer structure and a negative one-layer structure. C15 plain concrete is backfilled at the junction of the outer wall of the underground three-layer (negative three-layer) and the boundary support piles. The end part of the outer wall of one side of the floor slab 22 (corresponding to the position of the floor slab 33 at the bottom of the second-stage structure) close to the boundary support pile of the first-stage structure is thickened, the thickness and the reinforcing bars are equal to the floor slab 33 at the bottom of the second-stage structure, and the water stop steel plate 9 is embedded in the thickened end part. The second stage foundation pit comprises two inner supports 5. When the floor slab 33 of the bottom layer of the second-stage structure is constructed, the water stop steel plate is buried, a force transmission belt is arranged between the floor slab 33 of the bottom layer of the second-stage structure and the boundary support pile 1, the force transmission belt carries out reliable supporting and force transmission, and the node structure of the force transmission belt refers to fig. 6.
The second-phase structure comprises a second underground layer, namely a second negative layer and a first negative layer. And taking a row of boundary support piles 1 as a boundary, excavating earthwork of a second-stage foundation pit in a layering manner, and supporting 5 along with construction along with excavation. After the first inner support and the second inner support are constructed, a cushion layer, a waterproof and waterproof protective layer and a floor slab 33 at the bottom layer of a second-stage structure are constructed. After the floor slab 33 on the bottom layer is constructed, the force transmission belt is constructed in time, the force transmission belt is supported on the second side of the boundary support pile 1, and the force transmission belt reaches the state that the support bar is detached to detach the second support.
S323, after the second inner support is removed, constructing a negative second-layer structure of the second-stage structure, a negative first-layer floor slab and an I-shaped steel force transmission belt, wherein the I-shaped steel force transmission belt is supported on the second side of the boundary support pile in the same way. And (3) completing construction of the I-shaped steel force transmission belt of the floor slab with the first floor layer, and removing the first inner support after the supporting strip piece is replaced.
And S324, after the first inner support is removed, constructing a negative layer structure and a top floor of a second-stage structure.
Specifically, when the floor slab 31 at the top layer of the secondary structure is constructed, the row of boundary support piles 1 at the floor slab 31 at the top layer of the secondary structure is cut off, and the floor slab 31 at the top layer of the secondary structure is connected to the floor slab 21 at the top layer of the primary structure to form a fully-closed floor slab.
And S4, cutting off a row of boundary support piles at the rest floor slabs of the secondary structure layer by layer from top to bottom, and connecting the rest floor slabs of the secondary structure to the floor slabs of the primary structure layer by layer simultaneously along with the cutting off of the boundary support piles to form the fully-closed floor slabs.
Specifically, the multi-layer floor slab of the secondary structure includes a top floor slab, a middle floor slab and a bottom floor slab, and the step S4 includes:
and S41, cutting off a row of boundary support piles at the floor slab of the middle layer of the second-stage structure layer by layer from top to bottom, wherein when the row of boundary support piles at the floor slab of each middle layer of the second-stage structure is cut off, the row of boundary support piles are cut off for multiple times, after the boundary support piles are cut off each time, the floor slab of the second-stage structure where the boundary support piles are cut off is connected with the floor slab of the first-stage structure to form a partially connected floor slab, and until the row of boundary support piles at the floor slab of the middle layer of the first layer of the second-stage structure is completely cut off, the floor slab of the middle layer of the second-stage structure is connected with the floor slab of the first-stage structure to form a fully-closed floor slab.
Further, the step of "dividing a row of boundary piles a plurality of times" in the step S41 includes dividing a row of boundary piles twice. As a preferred embodiment, the boundary support piles are cut off for the first time, so that every two boundary support piles are cut off in sequence; and cutting off the rest boundary support piles for the second time.
Specifically, step S41 includes:
and S411, cutting off a plurality of boundary support piles 1 above the middle-layer floor slab at intervals by adopting the method of cutting off a row of boundary support piles for multiple times from top to bottom layer by layer, and connecting the middle-layer floor slab 32 of the secondary structure 3 to the middle-layer floor slab 22 of the primary structure 2 at the cutting off positions of the boundary support piles 1 to form a part of connecting floor slabs B.
The boundary support piles are cut at intervals, floor slabs at corresponding connection positions are constructed at the interval cutting positions, the floor slabs of the first-stage structure are connected with the floor slabs of the second-stage structure at intervals (parts), an integral force transmission system is formed, and the cutting sequence of the boundary support piles is shown in figure 5.
Specifically, referring to fig. 3 and 4, the method of the space division includes: and cutting off two boundary supporting piles 1 above the floor slab at the bottom layer every two boundary supporting piles 1.
And S412, cutting off the rest boundary support piles 1 at the floor slab of the middle layer of the secondary structure 3, and connecting the floor slab 32 of the middle layer of the secondary structure 3 to the floor slab 22 of the middle layer of the primary structure 2 at the cutting off positions of the boundary support piles 1 to form a fully-closed floor slab of the middle layer.
And S42, cutting off a row of boundary support piles at the floor slab at the bottom layer of the secondary structure at one time, and connecting the floor slab at the bottom layer of the secondary structure to the floor slab of the primary structure to form a fully-closed floor slab.
And cutting off a row of boundary support piles 1 at the bottom floor of the secondary structure, and connecting the bottom floor 33 of the secondary structure 3 to the floor of the primary structure 2 at the cutting off positions of the boundary support piles 1 to form a bottom totally-enclosed floor.
After the boundary support piles are completely cut off, the floor slab 33 of the bottom layer of the second-stage structure and the floor slab 22 of the underground three-layer of the first-stage structure are connected (connected) to form a whole, and meanwhile, the first-stage structure is connected with the waterproof layer of the bottom plate of the second-stage structure. Specifically, after all the boundary support piles are cut off, a post-cast strip is formed between the floor slab 33 of the bottom layer of the secondary structure and the floor slab 22 of the underground three layers of the primary structure in a pouring mode, and the post-cast strip is formed.
The construction method of the foundation pit staged structure comprises the steps of sealing and connecting floor slabs layer by layer from top to bottom to form an integral force transmission system, further adopting the support piles as boundary support structures, and cutting off parts at intervals when the floor slabs are connected in a sealed mode to form an effective force transmission system to ensure the connection quality and the butt joint stability of the structure.
In view of the foundation pit structure forms of different depths, staged connection construction provides higher requirements for the connection quality of concrete structures and the structure safety during butt joint. Under the condition that the surrounding environment of the foundation pit is complex, particularly the outer side of the foundation pit with the secondary structure is only 2 meters close to the subway and is a water-rich soft soil area, the geological condition is hydrologically complex, and the important construction difficulty is to effectively connect the primary and secondary structure construction safely and effectively and ensure that the deformation of the foundation pit is in an allowable range.
During construction of the first-stage structure, the boundary support pile at the joint of the first-stage structure and the second-stage structure is also in force transmission with the embedded I-shaped steel (force transmission belt), and force is transmitted to the boundary support pile. During the construction of the second-stage structure, the force transmission section steel is embedded in the top plate in the same way. When the boundary supporting pile is cut off for the first time, chiseling is convenient to remove at the top of the boundary supporting pile, construction is fast and timely, the top floor of the underground layer is connected, the top floor is closed in time with the totally-closed floor of the top layer, the problem that rainwater is poured into a basement in a rainy period is solved, and the structure is effectively connected and guaranteed to be stable. When the basement floor height is higher, when cutting off the boundary support pile at the floor in the middle layer, the time consumption is long, the floor forms a cantilever and cannot be connected in time to transfer force, the structure is easy to be unstable, and the safety of a foundation pit is indirectly influenced.
Therefore, the boundary support piles are cut off layer by layer in the vertical direction, the boundary support piles are cut off for multiple times at intervals in the horizontal direction, and the floor slab with the first-stage structure and the floor slab with the second-stage structure are connected into a whole (partially connected floor slab) at any time along with the cutting off. The boundary support piles are cut off periodically at vertical layers and horizontal intervals and connected with the structure to be in stress adaptive deformation, secondary connection is stable, large tensile stress cannot be generated on the floor slab, small deformation is adapted, and cracks are not generated in the floor slab connection.
When the underground second floor of the first-stage structure is connected with the floor slab of the bottom of the second-stage structure, the node is complex and special, and when the first-stage structure is constructed, C15 plain concrete is poured to be in close contact with the boundary support pile so as to transfer force reliably. Meanwhile, the water stop steel plate is embedded in the structure, the water stop steel plate is also embedded in the bottom floor slab of the secondary structure, and the poured concrete is improved by one strength level and is micro-expansive concrete, so that the connection reliability is ensured, and water leakage is avoided. The structure is safe and reliable, the hidden danger of water leakage is avoided, the foundation pit is stable, and the surrounding environment is not influenced. The construction is safely and effectively guaranteed.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the invention is to be defined by the scope of the appended claims.
Claims (6)
1. A construction method of a foundation pit staged structure is characterized by comprising the following steps:
constructing a row of boundary support piles in the foundation pit;
constructing a first-stage structure on the first side of the row of the boundary support piles, wherein the first-stage structure temporarily supports against the first side of the row of the boundary support piles;
constructing a second-stage structure from bottom to top on the second sides of the row of boundary support piles, wherein the second-stage structure is temporarily supported against the second sides of the row of boundary support piles, the first-stage structure and the second-stage structure respectively comprise a plurality of layers of floor slabs, and the floor slabs of the second-stage structure are arranged opposite to the floor slabs of the first-stage structure, wherein when the floor slabs of the top layer of the second-stage structure are constructed, the row of boundary support piles at the floor slabs of the top layer of the second-stage structure are cut off, and the floor slabs of the top layer of the second-stage structure are connected to the floor slabs of the top layer of the first-stage structure to form a fully-closed floor slab;
and cutting off the one row of boundary support piles at the rest of the floor slabs of the secondary structure layer by layer from top to bottom, and respectively connecting the rest of the floor slabs of the secondary structure layer by layer to the floor slab of the primary structure along with the cutting off of the boundary support piles to form a fully-closed floor slab.
2. The construction method of a foundation pit staged structure according to claim 1, wherein the step of removing the row of boundary piles from top to bottom layer by layer at the rest of the floor slabs of the secondary structure, and connecting the rest of the floor slabs of the secondary structure to the floor slabs of the primary structure layer by layer along with the removal of the boundary piles to form a totally enclosed floor slab comprises:
cutting off a row of boundary support piles at the floor slab of the middle layer of the secondary structure layer by layer from top to bottom, wherein when the row of boundary support piles at the floor slab of each layer of the middle layer of the secondary structure is cut off, the row of boundary support piles are cut off for multiple times, and after the boundary support piles are cut off each time, the floor slab of the secondary structure where the boundary support piles are cut off is connected with the floor slab of the primary structure to form a partially connected floor slab, until the row of boundary support piles at the floor slab of the middle layer of the one layer of the secondary structure is completely cut off, the floor slab of the middle layer of the secondary structure is connected with the floor slab of the primary structure to form a fully closed floor slab;
and cutting off one row of boundary support piles at the floor slab of the bottom layer of the secondary structure at one time, and connecting the floor slab of the bottom layer of the secondary structure to the floor slab of the primary structure to form a fully-closed floor slab.
3. The method of constructing a staged foundation pit structure as claimed in claim 2, wherein said step of removing a row of said boundary piles a plurality of times comprises removing a row of said boundary piles a second time.
4. The construction method of a foundation pit staged structure according to claim 3, wherein the step of removing one row of the boundary piles twice comprises:
cutting off the boundary support piles for the first time so as to sequentially cut off every two boundary support piles;
and cutting off the rest boundary support piles for the second time.
5. The method of constructing a staging structure for a foundation pit according to claim 1, wherein a mixing pile is embedded on a second side of the array of boundary piles before the step of constructing a secondary structure on the second side of the array of boundary piles from bottom to top, the mixing pile being supported on a bottom of the floor slab at a bottom of the secondary structure.
6. The method for constructing a staged foundation pit structure as claimed in claim 1, wherein the step of constructing the secondary structure from bottom to top on the second side of the row of boundary piles comprises:
constructing a plurality of inner supports between the inner wall of the foundation pit and the second side of the row of boundary support piles from top to bottom;
and (4) dismantling each inner support from bottom to top, and constructing each floor at each inner support.
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| CN201911004096.8A CN110777803A (en) | 2019-10-22 | 2019-10-22 | Construction method of foundation pit staged structure |
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| CN201911004096.8A CN110777803A (en) | 2019-10-22 | 2019-10-22 | Construction method of foundation pit staged structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111945743A (en) * | 2020-08-15 | 2020-11-17 | 中铁十一局集团第一工程有限公司 | Multi-layer unbalanced foundation pit supporting method suitable for staged excavation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012655A (en) * | 2006-12-30 | 2007-08-08 | 上海市城市建设设计研究院 | Construction method of carrying out underground space rigid connection by stages |
| CN104099944A (en) * | 2014-07-24 | 2014-10-15 | 武汉市汉阳市政建设集团公司 | Construction method for connecting subway station and long-span accessory structure |
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2019
- 2019-10-22 CN CN201911004096.8A patent/CN110777803A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012655A (en) * | 2006-12-30 | 2007-08-08 | 上海市城市建设设计研究院 | Construction method of carrying out underground space rigid connection by stages |
| CN104099944A (en) * | 2014-07-24 | 2014-10-15 | 武汉市汉阳市政建设集团公司 | Construction method for connecting subway station and long-span accessory structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111945743A (en) * | 2020-08-15 | 2020-11-17 | 中铁十一局集团第一工程有限公司 | Multi-layer unbalanced foundation pit supporting method suitable for staged excavation |
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