CN113089678B - Deep foundation pit unearthed ramp under complex surrounding environment and construction method - Google Patents
Deep foundation pit unearthed ramp under complex surrounding environment and construction method Download PDFInfo
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- CN113089678B CN113089678B CN202110400864.2A CN202110400864A CN113089678B CN 113089678 B CN113089678 B CN 113089678B CN 202110400864 A CN202110400864 A CN 202110400864A CN 113089678 B CN113089678 B CN 113089678B
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
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- 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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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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
- E04G27/00—Temporary arrangements for giving access from one level to another for men or vehicles, e.g. steps, ramps
Abstract
The invention provides a deep foundation pit unearthed ramp under a complex surrounding environment and a construction method thereof, wherein the deep foundation pit unearthed ramp under the complex surrounding environment comprises a foundation pit, and a foundation pit external ramp, a foundation pit internal first ramp, a foundation pit internal second ramp and a foundation pit internal third ramp which are connected in sequence, the periphery of the foundation pit is provided with a first enclosure structure, the interior of the foundation pit is vertically provided with a first support, a second support and a third support, a ramp door opening is arranged between the first support and the second support on the side wall of the corner of the foundation pit, the foundation pit external ramp is a side slope soil outlet ramp connected to the bottom of the ramp door opening, the first ramp in the foundation pit is a horizontal ramp without a side slope, which is flush with the second support, the second ramp in the foundation pit is a soil discharging ramp with a side slope, which is connected between the second support and the third support, and the third ramp in the foundation pit is a slope soil outlet ramp connected between the third support and the bottom of the foundation pit. The invention can greatly shorten the construction period and reduce the cost.
Description
Technical Field
The invention belongs to the technical field of foundation pit construction, and particularly relates to a deep foundation pit unearthing ramp under a complex surrounding environment and a construction method.
Background
In recent years, city construction in China is rapidly developed, and in order to meet the requirements of city transformation and development, city rail transit, high-rise building construction and the like, foundation pit engineering gradually has the characteristics of depth, large scale, close to important buildings (structures), pipelines, compact site and the like, namely, excavation depth is deep, large scale, and the deformation control requirement on the foundation pit in the construction process is extremely strict due to the complex surrounding environment.
For a deep foundation pit in a complex surrounding environment (such as near a subway), a supporting form combining pit excavation and an enclosure structure with an inner support is generally adopted, the inner support is usually reinforced concrete or a steel support (a steel pipe support or a profile steel support), and meanwhile, a conventional soil discharging mode is adopted, such as trestle construction, soil slope building and back excavation or vertical transportation of a long-arm excavator and the like. However, when the conditions of narrow foundation pit area, deep excavation depth and the like are met, the traditional unearthing mode (trestle or slope putting) cannot be smoothly implemented due to the shortage of fields, and the restriction factors of long construction period, high construction cost and the like of earthwork engineering are faced; meanwhile, the vertical transportation efficiency of facilities such as a long-arm excavator is reduced along with the increase of the depth of the foundation pit, so that the construction cost is increased, the construction period is prolonged, and good economic benefits are not achieved.
Disclosure of Invention
The invention aims to provide a ramp for excavating a deep foundation pit under a complex surrounding environment, aiming at the defects in the prior art.
Therefore, the above purpose of the invention is realized by the following technical scheme:
the utility model provides a deep foundation ditch unearthed ramp under complicated all ring edge borders, includes the foundation ditch to and the outer ramp of foundation ditch, the first ramp in the foundation ditch, the second ramp in the foundation ditch and the third ramp in the foundation ditch that connect gradually, be equipped with first envelope around the foundation ditch, the inside of foundation ditch is along vertical first support, second support and the third support of being equipped with, the ramp door opening has been seted up between first support and the second support of foundation ditch bight lateral wall, the outer ramp of foundation ditch is for connecting the slope unearthed ramp that has in ramp door opening bottom, first ramp is for supporting the horizontal ramp of no side slope of parallel and level with the second in the foundation ditch, the second ramp is for connecting the slope unearthed ramp that has between second support and third support in the foundation ditch, the third ramp is for connecting the slope unearthed ramp that has between the bottom of third support and foundation ditch in the foundation ditch.
While adopting the above technical solutions, the present invention can also adopt or combine the following technical solutions:
As a preferred technical scheme of the invention: the first support is of a reinforced concrete structure, and the second support and the third support are of a prestressed section steel combined structure.
As a preferred technical scheme of the invention: the first support, the second support and the third support at the corner position of the foundation pit where the ramp door opening is located are all of reinforced concrete structures.
As a preferred technical scheme of the invention: the foundation pit is characterized in that second enclosure structures in the foundation pit are arranged around the second ramp in the foundation pit, a concrete supporting beam is connected between the tops of the second enclosure structures in the foundation pit, the top of the front section of the second enclosure structure in the foundation pit close to the first ramp in the foundation pit is parallel and level to the second support, the top of the rear section of the second enclosure structure in the foundation pit far away from the first ramp in the foundation pit is parallel and level to the third support, soil is reserved outside the ramp on the two sides of the second ramp in the foundation pit close to the first ramp in the foundation pit, and soil is reserved inside the ramp in the second enclosure structure in the foundation pit.
As a preferred technical scheme of the invention: the foundation pit outer ramp comprises a foundation pit outer first ramp connected to the ramp door opening and a foundation pit outer second ramp connected to the foundation pit outer first ramp, wherein two sides of the foundation pit outer first ramp are provided with foundation pit outer first enclosure structures, two sides of the foundation pit outer second ramp are provided with two rows of foundation pit outer second enclosure structures, and a concrete supporting beam is connected between the tops of the two rows of foundation pit outer second enclosure structures on the same side.
As a preferred technical scheme of the invention: and waterproof curtains are arranged on the periphery of the first enclosure structure and the periphery of the first enclosure structure outside the foundation pit.
As a preferred technical scheme of the invention: the foundation pit external ramp further comprises a foundation pit external third ramp connected with the foundation pit external second ramp, and two sides of the foundation pit external third ramp are respectively provided with a foundation pit external second enclosure structure.
The invention also aims to provide a construction method of the deep foundation pit unearthed ramp under the complex surrounding environment, aiming at the defects in the prior art.
Therefore, the above purpose of the invention is realized by the following technical scheme:
a construction method of a deep foundation pit unearthed ramp under a complex surrounding environment comprises the following steps:
constructing a support upright post in a foundation pit, constructing first enclosure structures around the foundation pit, and constructing first enclosure structures outside the foundation pit on two sides of a first ramp outside the foundation pit; constructing a first support in the foundation pit;
excavating a second layer of soil above a second support in the foundation pit, a ramp door opening and a first layer of soil outside the foundation pit; constructing a second support in the foundation pit; constructing a part of the front section of the second enclosure structure in the foundation pit and a concrete support beam thereof; constructing a slope surface of an external slope of the foundation pit, a slope surface of a first slope in the foundation pit and a slope surface in the front section of a second enclosure structure in a part of the foundation pit;
Step three, excavating a second layer of soil body between a second support and a third support in the foundation pit; constructing a third support in the foundation pit; constructing the front section of the second enclosure structure in the rest part of the foundation pit, a concrete support beam of the second enclosure structure and a ramp surface in the second enclosure structure; constructing a second building enclosure rear section in the foundation pit, a concrete support beam of the second building enclosure rear section and a ramp surface in the second building enclosure rear section;
fourthly, excavating a third layer of soil body between a third support in the foundation pit and the bottom of the foundation pit;
and fifthly, dismantling the slope surface in the second slope in the foundation pit, excavating the slope of the second slope in the foundation pit and reserving soil, excavating a third slope in the foundation pit and constructing a structural bottom plate, and dismantling a third support, a second support and a first support from bottom to top in sequence.
While adopting the technical scheme, the invention can also adopt or combine the following technical schemes:
as a preferred technical scheme of the invention: and when a third layer of soil body is excavated in the fourth step, reserving soil outside the ramps on two sides of the second ramp in the foundation pit close to the first ramp in the foundation pit, and adopting natural slope setting construction for the third ramp in the foundation pit.
As a preferred technical scheme of the invention: in the first step, before constructing the first support, constructing second enclosing structures outside the foundation pit on two sides of a second ramp outside the foundation pit and two sides of a third ramp outside the foundation pit; and constructing a concrete support beam between the tops of the two rows of second building enclosures outside the foundation pit, wherein the second building enclosures are arranged on the same side of the second ramp outside the foundation pit.
Compared with the prior art, the invention has the characteristics and beneficial effects that:
(1) the invention provides an unearthed ramp and a construction method based on actual engineering and aiming at deep foundation pit engineering which is close to important buildings or facilities (such as subways), has small area, deep depth, short construction period and complex surrounding environment. The unearthed ramp comprises a foundation pit, an outer ramp of the foundation pit, a first ramp in the foundation pit, a second ramp in the foundation pit and a third ramp in the foundation pit. A first support, a second support and a third support are arranged in the foundation pit, and the unearthing ramp passes through the side wall of the foundation pit. The slope construction is adopted to the outer ramp of foundation ditch, and first ramp directly lays on the second supports in the foundation ditch, puts the slope construction between second support and third support and forms the second ramp in the foundation ditch, puts the slope construction naturally between third support and foundation ditch bottom and forms the third ramp in the foundation ditch. The integral advantages of the ramp structure are as follows: the construction is convenient, efficient, the time limit for a project is short. Compared with the traditional trestle, the construction of unearthed facilities is convenient, efficient and low in cost. Compared with the traditional slope-releasing, the repeated digging and filling of the slope way is avoided; compare with the perpendicular transportation of traditional long arm excavator, very big improvement unearthed efficiency.
(2) According to the invention, the second enclosure structure is arranged around the second ramp in the foundation pit, the outside-ramp soil retaining structure is arranged on two sides of the second ramp in the foundation pit close to the first ramp in the foundation pit, and the inside-ramp soil retaining structure is arranged in the foundation pit. The construction method has the advantages that through calculation and analysis and combination of related construction experience, the second support, the third support, the second enclosure structure in the foundation pit, the soil reserved outside the ramp and the soil reserved in the ramp are ingeniously utilized to form an integral structure which is used as the soil discharging ramp inside the foundation pit. Compared with trestle bridges and vertical transfer unearthing, the construction is convenient and fast, and the efficiency is high. Compared with the traditional slope-caving method, the repeated excavation and filling times of the soil slope are reduced, and earthwork at the second support and the third support can be excavated synchronously with earthwork in other areas in the foundation pit, so that the construction period can be greatly shortened.
(3) According to the invention, the first support, the second support and the third support are vertically arranged in the foundation pit, the first support, the second support and the third support at the corner position of the foundation pit where the ramp door opening is positioned are all of reinforced concrete structures, the first supports at the rest positions are all of reinforced concrete structures, and the second support and the third support are all of prestressed profile steel composite structures, so that the deformation of a soil body can be well controlled, and the construction of a composite unearthed facility is facilitated. The construction method combines the surrounding environment and the related construction experience to form a mixed support type of the concrete support and the steel support, can reduce the construction cost and actively control the deformation of the foundation pit well, and particularly comprises the following steps: the surrounding environment is complex, and the first support is generally supported by concrete according to relevant regulations; the second support and the third support adopt a prestress steel combined support matched with a servo system, the construction is rapid and convenient, the cost is low, prestress can be applied according to needs in the construction process, and the purpose of actively controlling the deformation of the foundation pit soil body is achieved. The three supports at the door opening of the ramp all adopt concrete supports, and can be matched with a second support to form a first ramp in the foundation pit for connecting the outer ramp of the foundation pit and the second ramp in the foundation pit.
(4) The foundation pit external ramp comprises a foundation pit external first ramp, a foundation pit external second ramp and a foundation pit external third ramp which are sequentially connected. Two sides of the first ramp outside the foundation pit are provided with first enclosing structures outside the foundation pit; two rows of second enclosure structures outside the foundation pit are arranged on two sides of the second ramp outside the foundation pit, and a concrete support beam is connected between the tops of the two rows of second enclosure structures outside the foundation pit on the same side; and the two sides of the third ramp outside the foundation pit are provided with second enclosure structures outside the foundation pit. The advantages of this approach are: through numerical calculation and combination of related construction experience, first enclosing structures outside the foundation pit are arranged on two sides of the first ramp outside the foundation pit, so that the overall stability of the foundation pit affected by the ramp door opening can be improved; the arrangement of the enclosure structures and the related facilities on the two sides of the second ramp and the third ramp outside the foundation pit is rapid and convenient in construction, and the problem that slopes cannot be placed due to limited sites, complex surrounding environment and the like is solved.
(5) The ramp is newly arranged in the foundation pit, namely the first ramp in the foundation pit and the second ramp in the foundation pit, in the construction process, the earth excavation at the corner position of the foundation pit where the ramp door opening in the foundation pit is located has no hysteresis phenomenon, the earth excavation can be simultaneously excavated with the earth in other areas in the foundation pit according to the construction steps, and the second support and the third support at the corner position where the corresponding ramp door opening is located can be simultaneously constructed with the supports at other positions, so that the construction period is greatly shortened, and the cost is reduced.
Drawings
Fig. 1 is a schematic view of a plane in which a first support is located.
Fig. 2 is an enlarged view of a portion in fig. 1.
Fig. 3 is a schematic view of the plane of the second support.
Fig. 4 is a schematic view of the plane of the third support.
Fig. 5 is a schematic view of the S-S section in fig. 4.
Fig. 6 is a schematic view of the section a-a in fig. 1.
Fig. 7 is a schematic view of the section B-B in fig. 1.
Fig. 8 is a schematic view of the section C-C in fig. 3.
FIG. 9 is a schematic view of section D-D or section E-E in FIG. 1.
Fig. 10 is a schematic view of the section F-F in fig. 1.
Fig. 11 is a schematic view of the section G-G in fig. 1.
FIG. 12 is a schematic view of the H-H section of FIG. 1.
FIG. 13 is a schematic view of the section K-K in FIG. 4.
Fig. 14 is a schematic view of the section M-M in fig. 4.
FIG. 15 is a schematic construction diagram of step two.
Fig. 16 is a construction diagram of step three.
FIG. 17 is a schematic view of the section K-K in FIG. 16.
Fig. 18 is a schematic view of the section M-M in fig. 16.
Fig. 19 is a construction diagram of step four.
FIG. 20 is a schematic view of the section K-K in FIG. 19.
Fig. 21 is a schematic view of the section M-M in fig. 19.
In the figure: 1-foundation pit, 2-foundation pit external ramp, 21-foundation pit external first ramp, 22-foundation pit external second ramp, 23-foundation pit external third ramp, 3-foundation pit internal first ramp, 4-foundation pit internal second ramp, 5-foundation pit internal third ramp, 6-first support, 7-second support, 8-third support, 9-first enclosure structure, 10-waterproof curtain, 11-foundation pit internal second enclosure structure, 111-foundation pit internal second enclosure structure front section, 112-foundation pit internal second enclosure structure rear section, 12-ramp external soil retention, 13-ramp internal soil retention, 14-support beam, 15-support column, 16-second layer soil body, 17-first layer soil body, 18-foundation pit external first enclosure structure, 19-foundation pit external second enclosure structure, 20-third layer soil body.
Detailed Description
The present invention will be further described in order to make the technical means, innovative features, objects and effects of the invention apparent.
The embodiments described herein are specific embodiments of the present invention, and are intended to be illustrative and exemplary of the concepts of the present invention and should not be construed as limiting the scope of the embodiments of the present invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other embodiments that are obvious based on the disclosure of the claims and the specification herein, including those that employ any obvious substitutions and modifications to the embodiments described herein.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-14, the deep foundation pit unearthing ramp under the complex surrounding environment comprises a foundation pit 1, and an outer foundation pit ramp 2, an inner foundation pit first ramp 3, an inner foundation pit second ramp 4 and an inner foundation pit third ramp 5 which are connected in sequence. A first enclosure structure 9 is arranged around the foundation pit 1, and a crown beam is arranged at the top of the first enclosure structure 9. Due to the fact that a higher water level exists outside the field, the waterproof curtain 10 is arranged on the periphery of the first enclosure structure 9. The inside of foundation ditch 1 is along vertical first support 6 that is equipped with, second support 7 and third support 8, the ramp door opening has been seted up between the first support 6 of 1 bight lateral wall of foundation ditch and the second support 7, foundation ditch outer ramp 2 is for connecting the slope soil discharging ramp that has in ramp door opening bottom, first ramp 3 is for supporting 7 parallel and level's no slope horizontal ramp with the second in the foundation ditch, second ramp 4 is for connecting the slope soil discharging ramp that has between second support 7 and third support 8 in the foundation ditch, third ramp 5 is for connecting the slope soil discharging ramp that has between the bottom of third support 8 and foundation ditch 1 in the foundation ditch.
The first support 6 is of reinforced concrete construction due to the proximity of the important building. In order to reduce the cost and better control the deformation of the soil body, the second support 7 and the third support 8 are of a prestressed section steel combined structure. In order to facilitate the construction of the composite unearthed facility, the first support 6, the second support 7 and the third support 8 at the corner position of the foundation pit 1 where the ramp door opening is located are all of reinforced concrete structures. The first support 6 is arranged on the inner side of the crown beam, the inner side of the first enclosure structure 9 is further provided with two enclosing purlins, and the second support 7 and the third support 8 are respectively connected to the inner sides of the enclosing purlins.
The periphery of the second slope 4 in the foundation pit is provided with a second enclosure structure 11 in the foundation pit, the top of the second enclosure structure 11 in the foundation pit is provided with a crown beam, a concrete supporting beam 14 is connected between the crown beams at the top of the second enclosure structure 11 in the foundation pit, the top of the front section 111 of the second enclosure structure in the foundation pit close to the first slope 3 in the foundation pit is flush with the second support 7, the top of the rear section 112 of the second enclosure structure in the foundation pit far away from the first slope 3 in the foundation pit is flush with the third support 8, the two sides of the second slope 4 in the foundation pit close to the first slope 3 in the foundation pit are provided with slope outer soil retention 12, and the second enclosure structure 11 in the foundation pit is internally provided with slope inner soil retention 13.
The outer ramp 2 of foundation ditch is including connecting in the outer first ramp 21 of foundation ditch of ramp door opening and connecting in the outer second ramp 22 of foundation ditch of the outer first ramp 21 of foundation ditch, and the both sides of the outer first ramp 21 of foundation ditch all are equipped with the outer first envelope 18 of foundation ditch, and the top of the outer first envelope 18 of foundation ditch is equipped with the crown beam, and the outer first envelope 18's of foundation ditch periphery is equipped with waterproof curtain 10. And the first enclosure structures 18 outside the foundation pit in the direction perpendicular to the ramp are also arranged between the first enclosure structures 18 outside the foundation pit and on the two sides of the first ramp 21 outside the foundation pit. Two rows of second enclosure structures 19 outside the foundation pit are arranged on two sides of the second ramp 22 outside the foundation pit, top beams are arranged at the tops of the second enclosure structures 19 outside the foundation pit, and concrete supporting beams 14 are connected between the top beams of the second enclosure structures 19 outside the two rows of foundation pits on the same side. The foundation pit external ramp 2 further comprises a foundation pit external third ramp 23 connected to the foundation pit external second ramp 22, the two sides of the foundation pit external third ramp 23 are respectively provided with a foundation pit external second enclosure structure 19, and the top of the foundation pit external second enclosure structure 19 is provided with a crown beam.
The invention provides a construction method of an unearthed ramp of a narrow deep foundation pit, which has strong applicability and is close to an important building or facility such as a subway and under complex environments such as a narrow and small area, deep depth, short construction period and complex surrounding environments. Before the construction, investigation is carried out, a preliminary design scheme is provided, feasibility of implementation of analysis schemes such as numerical simulation and structural calculation is carried out, and a final design scheme is determined by repeated adjustment. And determining that the first support 6, the second support 7 and the third support 8 at the corner position of the foundation pit 1 where the ramp door opening is located are all of reinforced concrete structures. The first supports 6 at the rest positions are of a reinforced concrete structure, and the second supports 7 and the third supports 8 are of a prestressed section steel combined structure. The construction method specifically comprises the following steps:
Step one, as shown in fig. 1, a support column 15 is constructed inside a foundation pit 1, a first enclosure structure 9 and a waterproof curtain 10 are constructed around the foundation pit 1, an outer first enclosure structure 18 and a waterproof curtain 10 are constructed on two sides of a first ramp 21 outside the foundation pit, and an outer second enclosure structure 19 is constructed on two sides of a second ramp 22 outside the foundation pit and two sides of a third ramp 23 outside the foundation pit; constructing a concrete support beam 14 between the tops of two rows of second building enclosures 19 outside the foundation pit and on the same side of the second ramp 22 outside the foundation pit; constructing a crown beam at the top of the first enclosure structure 9 and the first enclosure structure 18 outside the foundation pit; constructing a first support 6 in the foundation pit 1; and constructing a concrete support beam 14 between the tops of the second building envelopes 19 outside the two rows of foundation pits at the same side.
Step two, as shown in fig. 15, excavating a first layer of soil body 17 above the second support 7 in the foundation pit 1, above the ramp door opening and outside the foundation pit 1; constructing a surrounding purlin on the inner side of the first enclosure structure 9, and constructing a second support 7 on the inner side of the surrounding purlin; constructing a part of the front section 111 of the second enclosure structure in the foundation pit and a crown beam and a concrete support beam 14 at the top of the front section 111; and constructing the slope surface of the outer slope 2 of the foundation pit, the slope surface of the first slope 3 in the foundation pit and the slope surface in the front section 111 of the second enclosure structure in a part of the foundation pit, wherein the slope surfaces are reinforced concrete plates.
Step three, as shown in fig. 16-18, excavating a second layer of soil body 16 between a second support 7 and a third support 8 in the foundation pit 1; constructing a surrounding purlin on the inner side of the first enclosure structure 9, and constructing a third support 8 on the inner side of the surrounding purlin; constructing a second building envelope front section 111 in the rest part of the foundation pit, a top beam at the top of the second building envelope front section, a concrete support beam 14 and an internal ramp surface; and constructing a second building envelope rear section 112 in the foundation pit, a crown beam at the top of the second building envelope rear section, a concrete support beam 14 and an internal ramp surface.
And fourthly, as shown in figures 19 to 21, excavating a third layer of soil body 20 between the third support 8 in the foundation pit 1 and the bottom of the foundation pit 1. When a third layer of soil body 20 is excavated, the soil 12 outside the ramp is reserved on two sides of the second ramp 4 in the foundation pit close to the first ramp 3 in the foundation pit, and the third ramp 5 in the foundation pit adopts natural slope-laying construction.
And fifthly, dismantling the slope surface in the second slope 4 in the foundation pit, excavating the remaining soil 12 outside the slope of the second slope 4 in the foundation pit, excavating the third slope 5 in the foundation pit, constructing a structural bottom plate, and dismantling the third support 8, the second support 7 and the first support 6 from bottom to top in sequence.
Specifically, taking a certain project as an example, the first enclosure structure 9 and the first enclosure structure 18 outside the foundation pit are cast-in-situ bored piles with phi 1000@1200, and the elevation of the pile bottom is controlled by one time of excavation depth entering the bottom of the foundation pit. Constructing a phi 850@600 triaxial cement mixing pile outside the cast-in-situ bored pile, and controlling the pile bottom elevation to enter the bottom of the foundation pit by 4 m. The second enclosure structure 11 in the foundation pit and the second enclosure structure 19 outside the foundation pit are Larsen steel sheet piles. The section H-H adopts a 1:1 natural slope, and the excavation depth is 0-1.5 m. The section G-G, F-F, E-E adopts a 1:7 slope. And the Larsen steel sheet pile cantilever at the lower part of the section G-G has the pile length of 9 m. The excavation depth of the section G-G is 1.5-3.0 m. The excavation depth of the section F-F is 3-4.6m, the double rows of Larsen steel sheet pile cantilevers are arranged, and the pile length is 9 m. The excavation depth of the section E-E is 4.6-5.1m, the cantilever of the bored pile has the same pile length as the section A-A and the section B-B. The excavation depth of the section D-D is 5.1m, the cantilever of the bored pile is drilled, and the length of the pile is the same as the section A-A and the section B-B. And the excavation depth of the section C-C is that the second support in the section A-A/B-B reaches the bottom of the foundation pit. The pile length of the bored pile in the section a-A, B-B is 2 times the excavation depth. The length of the Larsen steel sheet pile in the section K-K/M-M is 15M. In addition, the enclosure structure, the support mode, the unearthing mode and the like can be adjusted according to actual conditions, and an optimal earthwork construction strategy is achieved. For example, the first enclosure structure 9 and the first enclosure structure 18 outside the foundation pit can be the diaphragm wall, and the second enclosure structure 11 inside the foundation pit and the second enclosure structure 19 outside the foundation pit can be cast-in-situ piles. And the section F-F, G-G cancels the second enclosure structure 19 outside the foundation pit and changes the second enclosure structure into a slope.
If the construction site allows, the elevation of the first building enclosure 9 at the ramp door opening is reduced to the plane where the third support 8 is located, and the unearthing step is adjusted, and the method specifically comprises the following steps:
step one, the same as the step one.
Secondly, excavating a first layer of soil body 17 above the second support 7 in the foundation pit 1, above the ramp door opening and outside the foundation pit 1; constructing a surrounding purlin on the inner side of a first enclosing structure 9 except for a ramp door opening, and constructing a second support 7 on the inner side of the surrounding purlin; the slope surface of the foundation pit external slope 2 of the construction part is a reinforced concrete slab.
Step three, excavating a second layer of soil 16 between a second support 7 and a third support 8 in the foundation pit 1; constructing a surrounding purlin on the inner side of the first enclosure structure 9, and constructing a third support 8 on the inner side of the surrounding purlin; constructing the ramp surface of the residual foundation pit external ramp 2; and constructing a second enclosure structure 11 and a slope surface thereof in the foundation pit.
And fourthly, excavating a third layer of soil body 20 between the third support 8 in the foundation pit 1 and the bottom of the foundation pit 1. And simultaneously constructing a third ramp 5 in the foundation pit.
And fifthly, dismantling the third ramp 5 in the foundation pit and the second ramp 4 in the foundation pit, constructing the structural bottom plate, and dismantling the supports in sequence to perform upward operation.
The above examples are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. The utility model provides a deep basal pit unearthed ramp under complicated all ring edge borders which characterized in that: including foundation ditch (1) to and the foundation ditch external ramp (2) that connect gradually, first ramp (3) in the foundation ditch, second ramp (4) in the foundation ditch and third ramp (5) in the foundation ditch, be equipped with first envelope (9) around foundation ditch (1), the inside of foundation ditch (1) is along vertical first support (6), second support (7) and third support (8) of being equipped with, ramp door opening has been seted up between first support (6) and the second support (7) of foundation ditch (1) bight lateral wall, foundation ditch external ramp (2) is for connecting the slope soil discharging ramp that has in ramp door opening bottom, first ramp (3) are for the no slope horizontal ramp with second support (7) parallel and level in the foundation ditch, second ramp (4) are for connecting the slope soil discharging ramp that has between second support (7) and third support (8) in the foundation ditch, third ramp (5) are for connecting the bottom that supports (8) and foundation ditch (1) in the foundation ditch The space between the two slope-type soil outlet slopes.
2. The deep foundation pit unearthing ramp under the complex surrounding environment of claim 1, wherein: the first support (6) is of a reinforced concrete structure, and the second support (7) and the third support (8) are of a prestress section steel combined structure.
3. The deep foundation pit unearthing ramp under complex surrounding environment of claim 1, characterized in that: the first support (6), the second support (7) and the third support (8) at the corner of the foundation pit (1) where the ramp door opening is located are all of reinforced concrete structures.
4. The deep foundation pit unearthing ramp under complex surrounding environment of claim 1, characterized in that: the foundation pit is characterized in that a second enclosure structure (11) in the foundation pit is arranged around a second ramp (4) in the foundation pit, a concrete supporting beam (14) is connected between the top of the second enclosure structure (11) in the foundation pit, the top of the front section (111) of the second enclosure structure in the foundation pit close to a first ramp (3) in the foundation pit is parallel and level with a second support (7), the top of the rear section (112) of the second enclosure structure in the foundation pit close to the first ramp (3) in the foundation pit is parallel and level with a third support (8), the two sides of the second ramp (4) in the foundation pit close to the first ramp (3) in the foundation pit are provided with a ramp outer soil retaining (12), and the second enclosure structure (11) in the foundation pit is internally provided with a ramp inner soil retaining (13).
5. The deep foundation pit unearthing ramp under complex surrounding environment of claim 1, characterized in that: the foundation pit outer ramp (2) is including connecting in the outer first ramp (21) of foundation pit of ramp door opening and connecting in the outer second ramp (22) of foundation pit of the outer first ramp (21) of foundation pit, the both sides of the outer first ramp (21) of foundation pit all are equipped with outer first envelope (18) of foundation pit, the both sides of the outer second ramp (22) of foundation pit all are equipped with outer second envelope (19) of two rows of foundation pits, are connected with concrete supporting beam (14) between the top of the outer second envelope (19) of two rows of foundation pits of homonymy.
6. The deep foundation pit unearthing ramp under complex surrounding environment of claim 5, characterized in that: and a waterproof curtain (10) is arranged on the periphery of the first enclosure structure (9) and the periphery of the first enclosure structure (18) outside the foundation pit.
7. The deep foundation pit unearthing ramp under complex surrounding environment of claim 6, characterized in that: the foundation pit outer ramp (2) further comprises an outer foundation pit third ramp (23) connected to the outer foundation pit second ramp (22), and outer foundation pit second enclosure structures (19) are arranged on two sides of the outer foundation pit third ramp (23).
8. A construction method of a deep foundation pit unearthed ramp under a complex surrounding environment is characterized by comprising the following steps: the method is used for constructing a deep foundation pit unearthed ramp under a complex peripheral environment, the deep foundation pit unearthed ramp under the complex peripheral environment comprises a foundation pit (1), an outer foundation pit ramp (2), an inner foundation pit first ramp (3), an inner foundation pit second ramp (4) and an inner foundation pit third ramp (5) which are sequentially connected, a first enclosure structure (9) is arranged around the foundation pit (1), a first support (6), a second support (7) and a third support (8) are vertically arranged inside the foundation pit (1), a ramp door opening is formed between the first support (6) and the second support (7) of the corner side wall of the foundation pit (1), the outer foundation pit ramp (2) is a slope unearthed ramp connected to the bottom of the ramp door opening, the inner foundation pit first ramp (3) is a non-edge-slope level which is parallel and level with the second support (7), and the inner foundation pit second ramp (4) is a slope level which is connected between the second support (7) and the third support (8) The third ramp (5) in the foundation pit is a slope soil-discharging ramp connected between the third support (8) and the bottom of the foundation pit (1);
The first support (6) is of a reinforced concrete structure, and the second support (7) and the third support (8) are of a prestressed section steel combined structure;
a first support (6), a second support (7) and a third support (8) at the corner position of a foundation pit (1) where a ramp door opening is located are all of a reinforced concrete structure;
a second enclosure structure (11) in the foundation pit is arranged around the second ramp (4) in the foundation pit, a concrete support beam (14) is connected between the tops of the second enclosure structures (11) in the foundation pit, the top of the front section (111) of the second enclosure structure in the foundation pit, which is close to the first ramp (3) in the foundation pit, is flush with the second support (7), the top of the rear section (112) of the second enclosure structure in the foundation pit, which is far away from the first ramp (3) in the foundation pit, is flush with the third support (8), the two sides of the second ramp (4) in the foundation pit, which are close to the first ramp (3) in the foundation pit, are provided with ramp external soil retaining (12), and the second enclosure structure (11) in the foundation pit is internally provided with ramp internal soil retaining (13);
the foundation pit external ramp (2) comprises a foundation pit external first ramp (21) connected to the ramp door opening and a foundation pit external second ramp (22) connected to the foundation pit external first ramp (21), wherein two sides of the foundation pit external first ramp (21) are respectively provided with a foundation pit external first enclosure structure (18), two sides of the foundation pit external second ramp (22) are respectively provided with two rows of foundation pit external second enclosure structures (19), and a concrete supporting beam (14) is connected between the tops of the two rows of foundation pit external second enclosure structures (19) on the same side;
A waterproof curtain (10) is arranged on the periphery of the first enclosure structure (9) and the periphery of the first enclosure structure (18) outside the foundation pit;
the foundation pit outer ramp (2) further comprises a foundation pit outer third ramp (23) connected to the foundation pit outer second ramp (22), and two sides of the foundation pit outer third ramp (23) are provided with foundation pit outer second enclosure structures (19);
the method comprises the following steps:
the method comprises the following steps that firstly, a support upright post (15) is constructed inside a foundation pit (1), a first enclosure structure (9) is constructed around the foundation pit (1), an outer foundation pit ramp (2) comprises an outer foundation pit first ramp (21) connected to a ramp door opening and an outer foundation pit second ramp (22) connected to the outer foundation pit first ramp (21), and outer foundation pit first enclosure structures (18) are constructed on two sides of the outer foundation pit first ramp (21); constructing a first support (6) in the foundation pit (1);
secondly, excavating a first layer of soil body (17) above a second support (7) in the foundation pit (1), at a ramp door opening and outside the foundation pit (1); constructing a second support (7) in the foundation pit (1); constructing a part of the front section (111) of the second enclosure structure in the foundation pit and a concrete support beam (14) thereof close to the first ramp (3) in the foundation pit; constructing the slope surfaces of an outer slope (2) of the foundation pit and a first slope (3) in the foundation pit and a part of the slope surface in the front section (111) of a second enclosure structure in the foundation pit;
Step three, excavating a second layer of soil body (16) between a second support (7) and a third support (8) in the foundation pit (1); constructing a third support (8) in the foundation pit (1); constructing the front section (111) of the second enclosure structure in the foundation pit of the rest part, a concrete support beam (14) of the second enclosure structure and a slope surface in the second enclosure structure; constructing a second building enclosure rear section (112) in the foundation pit, a concrete support beam (14) of the second building enclosure rear section and a slope surface inside the second building enclosure rear section;
fourthly, excavating a third layer of soil body (20) between a third support (8) in the foundation pit (1) and the bottom of the foundation pit (1);
and fifthly, dismantling the slope surface in the second slope (4) in the foundation pit, excavating the slope of the second slope (4) in the foundation pit and reserving soil (12), excavating the third slope (5) in the foundation pit, constructing a structural bottom plate, and dismantling a third support (8), a second support (7) and a first support (6) from bottom to top in sequence.
9. The construction method of the deep foundation pit unearthing ramp under the complex surrounding environment according to claim 8, characterized in that: and when a third layer of soil body (20) is excavated in the fourth step, the soil (12) reserved outside the ramp is reserved on two sides of the second ramp (4) in the foundation pit close to the first ramp (3) in the foundation pit, and the third ramp (5) in the foundation pit is constructed by natural slope laying.
10. The construction method of the deep foundation pit unearthed ramp under the complex surrounding environment according to claim 8, characterized in that: in the first step, before constructing the first support (6), constructing second enclosing structures (19) outside the foundation pit on two sides of a second ramp (22) outside the foundation pit and two sides of a third ramp (23) outside the foundation pit; and a concrete support beam (14) is constructed between the tops of two rows of second building enclosures (19) outside the foundation pit and on the same side of the second ramp (22) outside the foundation pit.
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| CN113914327A (en) * | 2021-11-08 | 2022-01-11 | 浙江乔兴建设集团有限公司 | Construction method for foundation pit enclosure and earth excavation |
| CN115354666A (en) * | 2022-08-24 | 2022-11-18 | 中建八局浙江建设有限公司 | Rapid construction method for concrete side truss-steel sheet pile combined deep foundation pit unearthed ramp |
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| KR20090094971A (en) * | 2008-03-04 | 2009-09-09 | 깨뱉시스템주식회사 | Under ground top-down method |
| CN105926673B (en) * | 2016-05-25 | 2019-05-21 | 上海建工一建集团有限公司 | A method of car ramp and floor structure synchronous construction in inverse work |
| CN109295983A (en) * | 2018-08-07 | 2019-02-01 | 中铁上海工程局集团有限公司 | Deep foundation pit earthwork digging construction method under a kind of large diameter circle truss support environment |
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