CN110616714B - Novel enclosure construction method for existing underground structure deepening - Google Patents
Novel enclosure construction method for existing underground structure deepening Download PDFInfo
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- CN110616714B CN110616714B CN201910863272.7A CN201910863272A CN110616714B CN 110616714 B CN110616714 B CN 110616714B CN 201910863272 A CN201910863272 A CN 201910863272A CN 110616714 B CN110616714 B CN 110616714B
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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
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0266—Enlarging
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Abstract
The invention provides a new enclosure construction method for extending an existing underground structure, which is characterized in that an original bottom plate and connecting parts of beam plates of the original structure and the original enclosure are removed from bottom to top in sections, concrete baffles are synchronously heightened from the original bottom plate to the top of a top plate from bottom to top, the concrete baffles are positioned in the original enclosure, the distance between the concrete baffles and the original enclosure is the width of the new enclosure, backfill materials are synchronously backfilled in gaps between the concrete baffles and the original enclosure layer by layer, new wall grooving treatment is carried out on the gaps between the concrete baffles and the original enclosure, a new wall reinforcement cage is placed in the grooves, and concrete pouring construction is carried out on a new underground continuous wall, so that the new enclosure is constructed in the existing underground structure, the influence on the surrounding environment can be reduced, the safety and stability of the existing underground structure and most of the existing underground structure can be ensured, in addition, the beam plates of the original structure and the original structure can be continuously used to the maximum extent, low construction cost and environmental protection.
Description
Technical Field
The invention belongs to the field of underground space construction, and particularly relates to a new enclosure construction method for the extension of an existing underground structure.
Background
With the rapid development of national economy for many years, the urbanization process is deepened continuously, the scale of infrastructure construction of each region is larger and larger, and under the background of large-scale construction, available land resources in cities are limited, particularly existing buildings in downtown areas of the cities are erected, underground structures are complex, and the development and construction of large underground spaces are greatly restricted.
With the rapid development of cities and the increasing shortage of urban land resources, the deep foundation pit supporting engineering of the adjacent existing underground building is more and more. For example, with the increasing population of cities in various centers, ground buildings have been far from meeting the daily demands of residents, and commercial civil and municipal facilities such as malls and subway stations are gradually developed to the deep underground. However, due to factors such as estimated pedestrian flow and capital cost, the space of the building under the initial construction time is often not considered for subsequent use, and the space design is too small to meet the use requirements after many years.
The original supporting structure of the existing underground building is generally fully utilized to comprehensively consider the foundation pit enclosure of the proposed new underground structure, but a plurality of problems are often encountered in the utilization process:
1. the water pressure of underground water is concentrated at the bottom plate, so that water burst is easy to occur;
2. part of the original underground structure becomes a barrier for the construction of a new structure;
3. the construction process is not consistent with the construction process of a common foundation pit, and many construction steps are even opposite in flow and need to be checked again.
Therefore, a new flow process needs to be innovated and proposed to meet the requirements of the subsequent existing building reconstruction construction.
Disclosure of Invention
The invention aims to provide a new enclosure construction method for extending an existing underground structure, which can realize the construction of a new enclosure in the existing underground structure, not only can reduce the influence of the new enclosure construction on the surrounding environment, but also basically does not influence the use function of the existing underground structure in the new enclosure construction process, and the follow-up original enclosure and the original structure beam plate can be continuously used to the maximum extent, so that the construction cost is low, and the method is green and environment-friendly.
In order to solve the technical problems, the invention provides the following technical scheme:
a new enclosure construction method for the extension of an existing underground structure is used for realizing the construction of a new enclosure in the original enclosure of the existing underground structure, the existing underground structure comprises the original enclosure, an original bottom plate, a top plate and a plurality of original structure floor plates positioned between the original bottom plate and the top plate, and the method comprises the following steps:
firstly, reinforcing a top plate of an existing underground structure;
chiseling the connecting part of the top plate of the existing underground structure and the original enclosure at one side of the existing underground structure, constructing a new crown beam on the top of the original enclosure, and chiseling a lining wall of the original enclosure;
thirdly, removing a part, close to the original enclosure, of the original structure floor at the lowest part in a segmented mode, constructing a concrete baffle on the original bottom plate, wherein the concrete baffle is located in the original enclosure, the distance between the concrete baffle and the original enclosure is the width of the new enclosure, the concrete baffle is tightly attached to the original structure floor at the lowest part, and a gap between the concrete baffle and the original enclosure is filled with plain concrete;
fourthly, arranging a vertical supporting rod between the lowest original structure floor slab and the part to be dismantled on the adjacent original structure floor slab;
step five, dismantling the original structure floor slab adjacent to the original structure floor slab at the lowest part in sections, and heightening the concrete baffle plates to the position above the top elevation of the original structure floor slab adjacent to the original structure floor slab at the lowest part in sections;
step six, backfilling backfill materials between the concrete baffle and the original enclosure to the top elevation of the original structure floor slab adjacent to the lowest original structure floor slab;
seventhly, repeating the third step to the sixth step from bottom to top until the concrete baffle is heightened to the top elevation of the top plate, and backfilling the backfill material between the concrete baffle and the original enclosure to the top elevation of the top plate;
step eight, repeating the step two to the step seven, forming a corresponding concrete baffle on the other side of the existing underground structure, and backfilling backfill materials between the corresponding concrete baffle formed on the other side of the existing underground structure and the original enclosure to the top elevation of the top plate;
step nine, performing new wall grooving treatment on a gap between a concrete baffle on one side of the existing underground structure and the original enclosure;
step ten, putting the new wall reinforcement cage into the groove formed in the step nine;
step eleven, pouring concrete of the new underground continuous wall in the groove;
and step twelve, repeating the step nine to the step eleven, and pouring a new underground continuous wall between the concrete baffle on the other side of the existing underground structure and the original enclosure, so as to realize the construction of the new enclosure in the existing underground structure.
Preferably, in the new enclosure construction method for the extension of the existing underground structure, in the first step, the vertical support frame is adopted to penetrate through each original structure floor slab from the original bottom plate of the existing underground structure and then support the top plate, so that the top plate of the existing underground structure is reinforced.
Preferably, in the new enclosure construction method for the existing underground structure extension, in the first step, whether the top plate needs to be thickened or not and the thickening thickness needs to be increased so as to meet the requirements of underground continuous wall construction mechanical equipment and construction site loads, and the calculation is carried out to determine the loads.
Preferably, in the third step, the length of each section of the part, close to the original enclosure, of the lowest original structure floor slab subjected to sectional dismantling is not more than 15.0m, the width of each section is 1.4-1.6 m, when the sections are dismantled, the part, 40-60 cm away from the original enclosure, of one side of the lowest original structure floor slab is dismantled manually, and reinforcing steel bars are reserved when the sections are dismantled manually, so that the reinforcing steel bars are connected with the reinforcing steel bars of the concrete baffle plates poured subsequently.
Preferably, in the new enclosure construction method for widening the existing underground structure, in the sixth step, the backfilled backfill material is medium coarse sand containing 6-10% by weight of cement powder.
Preferably, in the above new enclosure construction method for widening the existing underground structure, in the seventh step, the backfilled backfill material is medium coarse sand containing 6-10% by weight of cement powder.
Preferably, in the above new enclosure construction method for widening the existing underground structure, in the eighth step, the backfilled backfill material is medium coarse sand containing 6-10% by weight of cement powder.
According to the technical scheme disclosed above, compared with the prior art, the invention has the following beneficial effects:
the invention provides a new enclosure construction method for extending an existing underground structure, which is characterized in that an original bottom plate and connecting parts of beam plates of the original structure and the original enclosure are removed from bottom to top in a segmented manner, a concrete baffle is synchronously heightened from the original bottom plate to the top of a top plate from bottom to top, the concrete baffle is positioned in the original enclosure, the distance between the concrete baffle and the original enclosure is the width of the new enclosure, backfill materials are synchronously backfilled in gaps between the concrete baffle and the original enclosure layer by layer, new wall grooving treatment is carried out on the gaps between the concrete baffle and the original enclosure, a new wall reinforcement cage is placed in the groove, and concrete pouring construction of a new underground continuous wall is carried out, so that the new enclosure is constructed in the existing underground structure, the new enclosure construction can reduce the influence on the surrounding environment, and the safety and stability of the existing underground structure and most of the existing underground structure can be ensured to be used, in addition, the original enclosure and the original structural beam slab can be continuously used to the maximum extent, and the construction cost is low.
Drawings
Fig. 1 is a schematic structural diagram of a step one of a new enclosure construction method for an existing underground structure extension according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a new envelope construction method for an existing underground structure extension according to a second step of the present invention.
Fig. 3 is a schematic structural diagram of a new envelope construction method for an existing underground structure extension according to an embodiment of the present invention in step three.
Fig. 4 is a structural diagram of a new envelope construction method for an existing underground structure extension according to an embodiment of the present invention in step four.
Fig. 5 is a schematic structural diagram of a fifth step of the new enclosure construction method for the existing underground structure extension according to the embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a new envelope construction method for an existing underground structure deepening in step six according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a seventh step of the new enclosure construction method for the existing underground structure extension according to the embodiment of the present invention.
Fig. 8 is a structural schematic diagram of a new envelope construction method for an existing underground structure deepening in step eight according to an embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a ninth step of the new enclosure construction method for the existing underground structure extension according to the embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a new envelope construction method for an existing underground structure deepening in step ten according to an embodiment of the present invention.
Fig. 11 is a schematic structural diagram of eleven steps of a new enclosure construction method for an existing underground structure extension according to an embodiment of the present invention.
Fig. 12 is a schematic structural diagram of a twelfth step of the new enclosure construction method for the existing underground structure extension according to the embodiment of the present invention.
In the figure: 1-original enclosure, 2-original bottom plate, 3-top plate, 4-original structure floor slab, 5-vertical support frame, 6-new crown beam, 7-concrete baffle, 8-plain concrete, 9-vertical support rod, 10-backfill, 11-groove, 12-reinforcement cage and 13-new enclosure.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. The technical contents and features of the present invention will be described in detail below with reference to the embodiments illustrated in the accompanying drawings. It is further noted that the drawings are in greatly simplified form and are not to precise scale, merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. For convenience of description, the directions of "up" and "down" described below are the same as the directions of "up" and "down" in the drawings, but this is not a limitation of the technical solution of the present invention.
Referring to fig. 1 to 12, the present embodiment discloses a new enclosure construction method for an existing underground structure, which is used to implement the construction of a new enclosure 13 (i.e., a new underground continuous wall) in an original enclosure 1 (i.e., an old underground continuous wall) of an existing underground structure, so as to implement the vertical building of the existing underground structure, where the existing underground structure includes the original enclosure 1, an original bottom plate 2, a top plate 3, and a plurality of original structure floor slabs 4 located between the original bottom plate 2 and the top plate 3, and includes:
step one, as illustrated in fig. 1, a roof 3 of an existing underground structure is reinforced.
In order to meet the load of the underground continuous wall construction mechanical equipment and the construction site, whether the top plate 3 needs to be thickened or not and the thickness needs to be thickened can be determined through calculation.
Preferably, in the new enclosure construction method for the extension of the existing underground structure, in the first step, the vertical support frame 5 is adopted to support the top plate 3 after penetrating through each original structure floor slab 4 from the original bottom plate 2 of the existing underground structure, so that the reinforcement of the top plate 3 of the existing underground structure is realized. In this embodiment, the vertical support frame 5 is a rectangular frame body assembled by a steel pipe with a diameter of 609 mm.
And secondly, chiseling the connecting part of the top plate 3 of the existing underground structure and the original enclosure 1 at one side of the existing underground structure, constructing a new crown beam 6 on the top of the original enclosure 1, and chiseling the lining wall of the original enclosure 1 so as to prepare for the construction of a new underground continuous wall, as shown in fig. 2.
And step three, as shown in fig. 3, removing the part, close to the original enclosure 1, of the original structure floor 4 at the lowest part in sections, constructing a concrete baffle 7 on the original bottom plate 2, wherein the concrete baffle 7 is positioned in the original enclosure 1, the distance between the concrete baffle 7 and the original enclosure 1 is the width of a new enclosure 13, the concrete baffle 7 is tightly attached to the original structure floor 4 at the lowest part, and a gap between the concrete baffle 7 and the original enclosure 1 is filled with plain concrete 8.
In order to ensure the stability of the existing underground structure, preferably, in the above new enclosure construction method for the existing underground structure, in the third step, the length of each section of the part, close to the original enclosure 1, of the lowermost original structure floor 4 which is dismantled in sections is not more than 15.0m, the width of each section is 1.4-1.6 m, and when the sections are dismantled, the part, which is 140-60 cm away from the original enclosure, of one side of the lowermost original structure floor 4 is dismantled manually, and when the sections are dismantled manually, the steel bars are reserved, so that the steel bars are connected with the steel bars of the concrete baffle 7 which is poured subsequently.
Step four, as shown in fig. 4, a vertical support rod 9 is arranged between the lowest original structural floor slab 4 and the part to be removed of the adjacent original structural floor slab 4. In this embodiment, the vertical support rod 9 is a steel tube of 600 mm.
And fifthly, as shown in fig. 5, removing the original structural floor slab 4 adjacent to the original structural floor slab 4 at the lowest part in sections, and adding the concrete baffle 7 to the position above the top elevation of the original structural floor slab 4 adjacent to the original structural floor slab 4 at the lowest part in sections.
Sixthly, as shown in fig. 6, backfill materials 10 are backfilled between the concrete baffle 7 and the original enclosure 1 to the top elevation of the original structure floor 4 adjacent to the original structure floor 4 at the lowest position. The backfill material is backfilled, and the concrete baffle 7 and the original enclosure 1 are connected through the backfill material, so that the transmission of horizontal force is ensured, and the safety of an underground structure is ensured.
Seventhly, as shown in fig. 7, repeating the third step to the sixth step from bottom to top until the concrete baffle 7 is heightened to the top elevation of the top plate 3, and backfilling backfill materials 10 between the concrete baffle 7 and the original enclosure 1 to the top elevation of the top plate 3.
Step eight, as shown in fig. 8, repeating the step two to the step seven, forming a corresponding concrete baffle 7 on the other side of the existing underground structure, and backfilling backfill 10 between the corresponding concrete baffle 7 formed on the other side of the existing underground structure and the original enclosure 1 to the top elevation of the top plate 3.
Step nine, as shown in fig. 9, a new wall grooving 11 treatment is performed on the gap between the concrete baffle 7 on one side of the existing underground structure and the original enclosure 1.
Step ten, as shown in fig. 10, the new wall reinforcement cage 12 is lowered into the groove 11 formed in the step nine.
Eleventh, as shown in fig. 11, the new underground continuous wall in the groove 11, that is, the new enclosure 13, is concreted.
Step twelve, as shown in fig. 12, repeating the step nine to the step eleven, and pouring a new underground continuous wall between the concrete baffle 7 on the other side of the existing underground structure and the original enclosure 1, thereby realizing the construction of a new enclosure 13 in the existing underground structure.
Preferably, in the new enclosure construction method for widening the existing underground structure, in the sixth step to the eighth step, the backfilled backfill material 10 is medium coarse sand containing 6-10% by weight of cement powder. The purpose of backfilling medium coarse sand containing 6-10% by weight of cement powder is adopted, on one hand, the purpose of connecting the concrete baffle 7 with the original enclosure 1 is achieved, the transmission of horizontal force is ensured, and the safety of an underground structure is ensured; on the other hand, 6 ~ 10% weight ratio cement powder's effect is the bonding effect between the coarse sand in strengthening for the coarse sand wholeness is stronger, thereby further improves backfill horizontal biography power effect and whole structure stability at the work progress.
The construction method for the new enclosure of the existing underground structure is provided by the embodiment, the original bottom plate and the connecting part of each beam plate of the original structure and the original enclosure are removed in a subsection manner from bottom to top, the height of the top plate is synchronously increased from bottom to top from the original bottom plate, the concrete baffle is positioned in the original enclosure, the distance between the concrete baffle and the original enclosure is the width of the new enclosure, backfill is synchronously filled in a gap between the concrete baffle and the original enclosure layer by layer, new wall grooving treatment is carried out on the gap between the concrete baffle and the original enclosure, a new wall reinforcement cage is placed in the groove, new underground continuous concrete wall pouring construction is carried out, new construction in the existing underground structure is realized, the influence on the surrounding environment can be reduced, the safety and stability of the existing underground structure and most of use functions can be ensured, in addition, the beam plates of the original structure and the original structure of the invention can be continuously used to the maximum extent, low construction cost and environmental protection.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (5)
1. The utility model provides a new enclosure construction method that existing underground structure extends for realize the construction of new enclosure in the former enclosure of existing underground structure includes former enclosure, former bottom plate, roof and is located a plurality of former structure floor between former bottom plate and the roof, its characterized in that includes:
firstly, reinforcing a top plate of an existing underground structure;
chiseling the connecting part of the top plate of the existing underground structure and the original enclosure at one side of the existing underground structure, constructing a new crown beam on the top of the original enclosure, and chiseling a lining wall of the original enclosure;
thirdly, removing a part, close to the original enclosure, of the original structure floor at the lowest part in a segmented mode, constructing a concrete baffle on the original bottom plate, wherein the concrete baffle is located in the original enclosure, the distance between the concrete baffle and the original enclosure is the width of the new enclosure, the concrete baffle is tightly attached to the original structure floor at the lowest part, and a gap between the concrete baffle and the original enclosure is filled with plain concrete;
fourthly, arranging a vertical supporting rod between the lowest original structure floor slab and the part to be dismantled on the adjacent original structure floor slab;
step five, dismantling the original structure floor slab adjacent to the original structure floor slab at the lowest part in sections, and heightening the concrete baffle plates to the position above the top elevation of the original structure floor slab adjacent to the original structure floor slab at the lowest part in sections;
step six, backfilling backfill materials between the concrete baffle and the original enclosure to the top elevation of the original structure floor slab adjacent to the lowest original structure floor slab;
step seven, constructing according to the method from the step three to the step six from the bottom up until the concrete baffle is heightened to the top elevation of the top plate, and backfilling the backfill material between the concrete baffle and the original enclosure to the top elevation of the top plate;
step eight, repeating the step two to the step seven, forming a corresponding concrete baffle on the other side of the existing underground structure, and backfilling backfill materials between the corresponding concrete baffle formed on the other side of the existing underground structure and the original enclosure to the top elevation of the top plate;
step nine, performing new wall grooving treatment on a gap between a concrete baffle on one side of the existing underground structure and the original enclosure;
step ten, putting the new wall reinforcement cage into the groove formed in the step nine;
step eleven, pouring concrete of the new underground continuous wall in the groove;
and step twelve, repeating the step nine to the step eleven, and pouring a new underground continuous wall between the concrete baffle on the other side of the existing underground structure and the original enclosure, so as to realize the construction of the new enclosure in the existing underground structure.
2. A new enclosure construction method for an existing underground structure extension according to claim 1, wherein in the first step, the top plate is supported by vertical support frames after penetrating through the original structural floor slabs from the original bottom plate of the existing underground structure, so as to reinforce the top plate of the existing underground structure.
3. The method for constructing a new enclosure of an existing underground structure extension of claim 1, wherein in the first step, whether the top plate and the thickness are required to be thickened to satisfy the mechanical equipment and construction site load of the underground continuous wall construction is determined by calculation.
4. A new enclosure construction method for an existing underground structure extension according to claim 1, wherein in the third step, the length of each section of the part of the lowest original structure floor slab which is removed in sections and is close to the original enclosure is not more than 15.0m, the width of each section is 1.4-1.6 m, and when the sections are removed in sections, the part of one side of the lowest original structure floor slab, which is 40-60 cm away from the original enclosure, is removed manually, and reinforcing steel bars are reserved when the sections are removed manually, so that the reinforcing steel bars are connected with the reinforcing steel bars of the concrete baffle which is poured subsequently.
5. A new enclosure construction method for an existing underground structure extension as claimed in claim 1, wherein in the sixth step, the backfill material is medium coarse sand containing 6-10% by weight of cement powder.
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| JP2016028184A (en) * | 2015-09-15 | 2016-02-25 | 大成建設株式会社 | Underground skeleton of new building utilizing existing building |
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| JP2004263467A (en) * | 2003-03-03 | 2004-09-24 | Shimizu Corp | Reconstruction method using existing underground skeleton |
| EP2236677A2 (en) * | 2009-03-31 | 2010-10-06 | AS Amhold | Method for creating a building under an architectural monument |
| CN103195085A (en) * | 2013-04-02 | 2013-07-10 | 东南大学 | Downward story-adding basement and construction method thereof |
| CN103469817A (en) * | 2013-09-30 | 2013-12-25 | 中铁一局集团有限公司 | Existing subway station main structure broadening construction method |
| CN104088296A (en) * | 2014-06-24 | 2014-10-08 | 上海市城市建设设计研究总院 | Soft soil area basement layer adding construction method |
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