CN116497836A - Supporting method for foundation pit in limited space - Google Patents
Supporting method for foundation pit in limited space Download PDFInfo
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- CN116497836A CN116497836A CN202310559007.6A CN202310559007A CN116497836A CN 116497836 A CN116497836 A CN 116497836A CN 202310559007 A CN202310559007 A CN 202310559007A CN 116497836 A CN116497836 A CN 116497836A
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- foundation pit
- support plate
- supporting
- rod
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- 230000008093 supporting effect Effects 0.000 title claims abstract description 148
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000010276 construction Methods 0.000 claims abstract description 38
- 230000007246 mechanism Effects 0.000 claims description 49
- 239000002689 soil Substances 0.000 claims description 37
- 230000003014 reinforcing effect Effects 0.000 claims description 32
- 238000005553 drilling Methods 0.000 claims description 12
- 238000009412 basement excavation Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 10
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 9
- 238000004873 anchoring Methods 0.000 claims description 9
- 230000002787 reinforcement Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000009415 formwork Methods 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000013049 sediment Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000013459 approach Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 39
- 238000003825 pressing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2220/00—Temporary installations or constructions
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/40—Miscellaneous comprising stabilising elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Abstract
The invention discloses a supporting method of a foundation pit in a limited space, wherein a plurality of groups of embedded grooves are dug around the foundation pit, and stable anchor points are formed in the embedded grooves; hoisting the whole main support plate, the auxiliary support plate and the support base into the foundation pit through equipment, and reliably fixing the support base at the bottom of the foundation pit by utilizing a fixed anchor rod, so that the main support plate moves horizontally and approaches to the side wall of the foundation pit to perform preliminary support on a part of the side wall of the foundation pit; and separating the auxiliary support plate from the main support plate, wherein the auxiliary support plate is close to the side wall of the foundation pit, and the main support plate, the auxiliary support plate and the side wall of the foundation pit are close to and abut against to apply acting force so as to support the side wall of the foundation pit. The method can facilitate foundation pit supporting operation in a limited space, meets the requirement of the side wall of the foundation pit on supporting strength in the whole supporting process, effectively reduces the construction difficulty of foundation pit supporting, and has the advantages of good protection effect, high construction efficiency, low cost and the like.
Description
Technical Field
The invention relates to the technical field of foundation pit support, in particular to a method for supporting a foundation pit in a limited space.
Background
Deep foundation pit engineering is involved in all construction projects from ancient times to date. The continuous expansion of cities drives the high-speed development of civil engineering, and high-rise buildings become more and more pets for urban construction. The construction method has the advantages that a large number of underground structure buildings such as underground parking plants, basements, underground subway stations and underground civil air defense projects are gradually raised, deep foundation pit construction projects are also gradually carried into the brilliance, deep foundation pit construction projects must be developed and perfected, the construction method has important significance for guaranteeing the quality and safety of the projects and achieving economy of construction tasks, the deep foundation pit construction is self-evident for the importance of super high-rise buildings and large-scale construction, and the deep foundation pit technology is the basis for survival of the safety operation of the deep foundation pit construction.
The deep foundation pit and the shallow foundation pit are mainly different in depth, when the depth is more than or equal to 5 meters, the deep foundation pit can be classified into the deep foundation pit, in the process of excavating the foundation pit, a temporary template is arranged at the non-excavated part of the south side of the foundation pit, and in order to prevent collapse of soil around the foundation pit and under the condition that the template is not dismantled, the deep foundation pit with the excavation depth of more than 10 meters is required to be excavated, deformation and damage of existing buildings around the foundation pit are prevented, safe construction under the deep foundation pit is ensured, the influence of the deep foundation pit on existing buildings nearby is reduced, and the foundation pit is required to be supported timely and firmly.
Through searching, chinese patent publication number is: a deep foundation pit supporting method based on a limited space is disclosed in the chinese patent CN115387347 a. The supporting method comprises the following steps:
s1, constructing foundation pit supporting piles, excavating pile heads in time, and then binding crown beam steel bars, installing templates and pouring concrete;
s2, anchor rod drilling and grouting construction are carried out, then inter-pile net hanging and concrete spraying construction is carried out, a waist beam and an anchor head structure are installed after the strength of the anchor rod grouting body and the surface layer concrete meet the requirement, and prestress tensioning is carried out;
s3, performing lower earth excavation, anchor rod and pile inter-pile spraying protection;
s4, after the excavation of earthwork in the foundation pit is completed, timely carrying out ramp soil collection; a plurality of excavators are adopted to relay soil upwards at the steps at the ramp, the soil is intensively stacked on one side close to the foundation pit, and the top of the foundation pit is connected with the soil by adopting the excavators;
s5, prefabricating arc-shaped support plates and manufacturing a reinforcing component according to a foundation pit, splicing the arc-shaped support plates together in a deep foundation pit to form a support main body, penetrating first cutting strips of one arc-shaped support plate between adjacent arc-shaped support plates into first slots of the other arc-shaped support plate, reinforcing and waterproofing treatment is firstly carried out on joints formed between the odd-numbered adjacent arc-shaped support plates, and then reinforcing and waterproofing treatment is carried out on joints formed between the even-numbered adjacent arc-shaped support plates;
S6, arranging a plurality of stirring piles aligned with the connecting positions of two adjacent arc-shaped supporting plates in a one-to-one correspondence manner in soil outside the supporting main body, and arranging a back cover on the ground inside the supporting main body.
The above-mentioned patent document is used for supporting the side wall of the foundation pit in the construction process by manufacturing a plurality of arc plates in advance, so that the supporting effect of the side wall of the foundation pit is improved to a certain extent, but still the supporting effect is still to be further improved, and especially when the side wall of the foundation pit is deformed, the supporting strength requirements of different periods in the supporting process are difficult to meet due to lack of adjustment. Meanwhile, as the earthwork excavation of the ultra-deep foundation pit in the limited space is difficult and heavy, especially the slope soil collection is a difficult problem in front of a large number of construction units, the earthwork excavation sequence and method are improper, the efficiency is low, and safety accidents are easy to cause.
In addition, the deep foundation pit support is constructed on site, the time cost is relatively high, the required construction area is relatively large, and micro disturbance is difficult to achieve under the condition of being close to a building and a limited space. Therefore, a foundation pit supporting method based on a limited space is lacking at present.
Disclosure of Invention
1. Problems to be solved
The invention aims to provide a supporting method for a foundation pit in a limited space, which effectively improves the supporting effect on the foundation pit, is convenient for supporting the foundation pit in the limited space, remarkably reduces the difficulty of the construction operation of the foundation pit and improves the construction efficiency of the foundation pit.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a supporting method of a foundation pit in a limited space comprises the following steps:
firstly, digging a plurality of groups of embedded grooves around a foundation pit, and drilling holes in the embedded grooves through drilling equipment;
secondly, penetrating the anchor rod into the drill hole, and forming a stable anchoring point by pouring concrete;
thirdly, transferring the whole main support plate, the auxiliary support plate and the support seat body into a foundation pit through equipment, and reliably fixing the support seat body at the bottom of the foundation pit by using a fixed anchor rod;
a driving mechanism is started, so that the main support plate horizontally moves and is close to the side wall of the foundation pit, the main support plate performs primary support on a part of the side wall of the foundation pit, and the driving mechanism is stopped, so that the main support plate stops horizontally moving;
fifthly, starting a linkage mechanism to separate the auxiliary support plate from the main support plate so as to realize the unfolding of the auxiliary support plate and enable the auxiliary support plate to be close to the side wall of the foundation pit;
sixthly, continuously starting the driving mechanism to enable the main support plate to continuously move horizontally, enabling the main support plate and the auxiliary support plate to be close to and abut against the side wall of the foundation pit, and further applying acting force to reliably support the side wall of the foundation pit;
And seventh, the anchor rope is fixed on the support seat body, the other end of the anchor rope is connected with the anchor rod, and the construction of the whole support structure is realized by adjusting the tension of the anchor rope.
Furthermore, when the foundation pit is dug, firstly, holes are drilled on the edge of an unrestricted area of the foundation pit, holes are formed to the designed depth, the holes are cleared, the thickness of sediment at the bottom of the holes is not more than one decimeter, a reinforcement cage is poured down, concrete is poured, after the concrete pile is formed, a formwork is supported at the upper end of the concrete pile, and then crown beam construction is carried out.
Further, the first layer of earthwork excavation is carried out on the edge of the concrete pile in the unrestricted area of the foundation pit, the depth of the first layer of earthwork excavation is smaller than 2 meters, then the working face of the first layer of concrete pile is corrected, reinforcing steel meshes are bound between the first layer of concrete piles, reinforcing ribs are implanted, and then high-grade concrete is sprayed to the reinforcing steel meshes through concrete spraying equipment until the whole first layer of concrete retaining wall is formed.
Further, after the curing time of the first layer of concrete retaining wall exceeds seven days, the second layer of slope blocking construction is carried out, the second layer of earthwork is excavated through equipment, and the slope is repaired to the edge soil slope excavated by the second layer of slope repairing equipment, so that the second layer of soil slope forms a slope surface.
Furthermore, the anchor holes are drilled on the second-layer soil slope through the drilling equipment, the reinforcing steel bar meshes are placed on the second-layer soil slope, multiple groups of anchor holes are arranged in an array mode along the length and the width direction of the second-layer soil slope, anchor rods are arranged in the anchor holes, the anchor rods and the reinforcing steel bar meshes are fixedly combined through the fixing device, high-grade concrete is sprayed on the reinforcing steel bar meshes through the concrete spraying equipment until the second-layer soil slope forms an inclined-plane blocking slope.
Still further, reserve the enhancement section on the reinforcing bar net piece of second floor's concrete fender slope in advance, the enhancement section is arranged along the inclined plane incline direction of second floor's soil slope, the enhancement section sets up the multiunit along the inclined plane length direction interval of second floor's soil slope to at the second floor's soil slope ligature steelframe reinforcement cage in advance, the steelframe reinforcement cage is arranged along the length direction of enhancement section, and carries out the formwork in advance around the reinforcing bar reinforcement cage, sprays the concrete of high specification to the die cavity in for form fore-and-aft strengthening rib on the second floor's soil fender slope.
Furthermore, the number of layers of the inclined plane retaining slopes is reasonably planned according to the depth of the foundation pit, a third layer of inclined plane retaining slopes and a fourth layer of inclined plane retaining slopes are formed, a platform is formed between each layer of inclined plane retaining slopes, a reinforced mesh is paved on the platform, concrete is poured to form a supporting plane, a mechanical channel is reserved in the unrestricted area, and mechanical equipment can enter or exit conveniently.
Further, the foundation pit surface in the limited area of the foundation pit is trimmed, then a pile hole is drilled at the bottom of the foundation pit, a reinforcement cage is hoisted in the pile hole, high-standard concrete is poured into the pile hole to form a pile table, and the support seat body is reliably fixed on the pile table of the foundation pit by using a fixing anchor rod so as to stably support the support seat body.
Further, in the third step, the main support plate is connected with a driving mechanism, and the driving mechanism drives the main support plate to horizontally move to abut against or separate from the side wall of the foundation pit;
the main support plate is provided with an auxiliary support plate which is connected with the linkage mechanism;
the outer sides of the main support plate and the auxiliary support plate combined with the foundation pit are integrally arc-shaped, and the circle centers of the outer arc-shaped surfaces of the main support plate and the auxiliary support plate are concentrically arranged; the linkage mechanism drives the auxiliary support plate to rotate around the circle center of the outer arc surface and combine with or separate from the main support plate;
the main support plate is arranged on the support base body, the support base body is arranged at the pit bottom of the foundation pit, the support base body is connected with one end of an anchor rope, and the other end of the anchor rope extends out of the opening of the foundation pit and is connected with an anchor rod outside the foundation pit.
Further, the auxiliary support plate comprises a first auxiliary support plate and a second auxiliary support plate, and the first auxiliary support plate is provided with a containing opening for containing the main support plate; the second auxiliary supporting guard plate is connected with the first auxiliary supporting guard plate in a sliding manner;
The driving mechanism comprises a connecting push head arranged on the inner side of the main support plate, the connecting push head drives a screw rod to be connected, the driving screw rod is meshed with a driving nut, and the driving nut is rotatably arranged on the support frame and driven by the power unit to rotate;
the linkage mechanism comprises a first connecting rod arranged on the inner side of the first auxiliary supporting plate, one end of the first connecting rod is hinged with the inner side plate of the first auxiliary supporting plate, the other end of the first connecting rod is hinged with a second connecting rod, and hinge shafts at two ends of the first connecting rod are vertical; the inner side of the second auxiliary support guard plate is hinged with one end of a first support rod, the other end of the first support rod is hinged with a second support rod, the hinge shafts at the two ends of the first support rod are vertical, and the rod ends of the second connecting rod and the second support rod are respectively hinged with the support rod;
the second connecting rod and the second bracket rod are coaxially arranged with the hinged end of the supporting rod, and the lower end of the supporting rod is connected with the supporting seat body;
two toggle rods are vertically arranged in the area between the second connecting rod and the inner side of the second bracket rod, the two toggle rods are arranged at one end of the driving arm, and the other end of the driving arm is connected with a piston rod of the driving oil cylinder; the rod bodies of the two poking rods are respectively abutted against or separated from the inner side walls of the second connecting rod and the second bracket rod,
The driving arm is further provided with two driving deflector rods which are vertically arranged, the two driving deflector rods are arranged in the area between the outer sides of the second connecting rod and the second bracket rod, and the driving deflector rod body is respectively abutted against or separated from the outer side walls of the second connecting rod and the second bracket rod.
Compared with the prior art, the invention has the following technical effects:
according to the invention, the whole flow of the supporting method is optimally designed, and particularly, the side wall of the foundation pit is supported by the main supporting plate and the auxiliary supporting plate which are manufactured by hoisting in advance, so that the requirement of the side wall of the foundation pit on supporting strength in the whole supporting process is met, and meanwhile, the defects of poor supporting effect, complicated construction, high cost and low efficiency of the existing foundation pit with limited space are effectively overcome by adopting the supporting method.
When support construction is carried out, the main support plate and the auxiliary support plate can be directly hoisted into the foundation pit through equipment, the main support plate and the auxiliary support plate are connected through the driving mechanism and the linkage mechanism, after the main support plate and the auxiliary support plate are hoisted into the foundation pit, the main support plate and the auxiliary support plate are in a cage-closing state, the copy plate and the main support plate are separated through the linkage mechanism, so that the support area of the inner wall of the foundation pit is remarkably increased, the main support plate is driven to be close to the inner wall of the foundation pit through the driving mechanism, the supporting against the inner wall of the foundation pit is realized, and the reliability of the foundation pit support can be ensured.
Drawings
FIG. 1 is a front view of a construction process slope of an unrestricted area;
FIG. 2 is a top view of a construction process slope of an unrestricted area;
FIG. 3 is a top view of a foundation pit support structure system in a confined space;
FIG. 4 is a plan view schematically illustrating the use of the foundation pit wall in a confined area within a foundation pit with the foundation pit support structure system (i.e., main support plate, auxiliary support plate, and support base) in a confined space;
FIG. 5 is a plan view of the structure of the anchor bracket, anchor line and anchor bar mated;
FIG. 6 is a schematic structural diagram of a foundation pit supporting structural system in a confined space;
FIG. 7 is a schematic cross-sectional view of a foundation pit support structure system in a confined space at a first view angle;
FIG. 8 is a schematic cross-sectional view of a foundation pit support structure system in a confined space at a second view angle;
FIG. 9 is a schematic view of the structure of the support base;
FIG. 10 is a schematic view of the primary and secondary support plates in a first view of the drive mechanism in cooperation with each other;
FIG. 11 is a schematic view of the structure of the main support plate, the secondary support plate, and the drive mechanism in a second view of the cooperation;
FIG. 12 is a top view of the primary and secondary support plates mated with the drive mechanism;
FIG. 13 is a schematic view of a structure of a first view of a support adjustment plate;
FIG. 14 is a schematic view of a structure of a second view of the support adjustment plate;
FIG. 15 is a schematic view showing the configuration of the first sub-support plate, the second sub-support plate and the interlocking mechanism in cooperation with each other;
FIG. 16 is a schematic plan view of the first secondary support plate, the second secondary support plate and the linkage mechanism engaged with each other.
In the figure:
100. a main support plate; 120. a first insert wedge;
200. an auxiliary support guard board; 210. a first secondary support plate; 21a, a first opening; 21b, a first extension tube; 211. a receiving opening; 212. a sliding rail; 220. a second secondary support plate; 22a, a second opening; 22b, a second extension tube; 221. sliding support plates; 230. a first link; 240. a second link; 250. a first bracket bar; 260. a second bracket rod; 270. a support rod; 280. a toggle rod; 290. a driving arm; 291. a driving oil cylinder; 292. driving the deflector rod;
300. supporting the seat body; 310. a first base; 320. a second seat body; 330. a first support ram; 340. a second support post rod; 350. a first support trough plate; 360. a second support trough plate; 370. a ball; 380. a second insert wedge; 390. fixing the anchor rod;
400. an anchor rope; 410. an anchor bracket; 420. a pressing roller; 430. an anchor screw; 440. anchoring the screw tube;
500. A bolt; 510. connecting a push head; 511. a connecting frame plate; 512. the connecting support arm; 513. supporting the catheter; 514. a support spring; 515. a support pin; 5151. supporting the balls; 520. driving a screw rod; 530. a drive nut; 531. a drive gear; 532. a power gear; 533. a hydraulic motor; 540. a support frame;
600. supporting an adjusting plate; 610. adjusting the track; 620. an adjusting wheel; 630. an adjustment arm; 640. and (5) adjusting the oil cylinder.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that numerous specific details are set forth in the following description in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than as described herein, and therefore the present invention is not limited to the specific embodiments of the present disclosure.
It should be noted that, in the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Meanwhile, in the description of the present invention, unless explicitly specified and limited otherwise, terms such as "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
Furthermore, it should be understood that the dimensions of the various elements shown in the figures are not drawn to actual scale, e.g., the thickness or width of some layers may be exaggerated relative to other layers for ease of description.
Example 1
The foundation pit supporting structure of the present invention will be described in detail with reference to fig. 1 to 16:
referring to fig. 1 and 2, a method for supporting a foundation pit in a limited space includes the following steps:
firstly, digging a plurality of groups of embedded grooves around a foundation pit, and drilling holes in the embedded grooves through drilling equipment;
Secondly, penetrating the anchor rod 500 into the drill hole, and forming a stable anchoring point by pouring concrete;
thirdly, hoisting the whole main support plate 100, the auxiliary support plate 200 and the support base 300 into a foundation pit through equipment, and reliably fixing the support base 300 at the bottom of the foundation pit by using a fixed anchor rod 390;
fourthly, starting a driving mechanism to enable the main support plate 100 to horizontally move and approach to the side wall of the foundation pit, enabling the main support plate 100 to initially support a part of the side wall of the foundation pit, stopping the driving mechanism, and enabling the main support plate 100 to stop horizontally moving;
fifthly, starting a linkage mechanism to separate the auxiliary support guard plate 200 from the main support guard plate 100 so as to realize the unfolding of the auxiliary support guard plate 200 and enable the auxiliary support guard plate 200 to be close to the side wall of the foundation pit;
sixthly, continuously starting the driving mechanism to enable the main support plate 100 to continuously move horizontally, enabling the main support plate 100 and the auxiliary support plate 200 to be close to and abut against the side wall of the foundation pit, and further applying acting force to reliably support the side wall of the foundation pit;
seventh, the anchor rope 400 is fixed on the supporting seat body 300, and the other end of the anchor rope 400 is connected with the anchor rod 500, and the construction of the whole supporting structure is realized by adjusting the tension of the anchor rope 400.
Referring to fig. 1 and 2, when the foundation pit is excavated, firstly, holes are drilled at the edge of an unrestricted area of the foundation pit, holes are formed to a designed depth, the holes are cleared, the thickness of sediment at the bottom of the holes is not more than one decimeter, a reinforcement cage is poured down, concrete is poured, after the concrete pile a is formed, a formwork is supported at the upper end of the concrete pile a, and then a crown beam B is constructed.
And (3) carrying out first-layer earth excavation on the edges of the concrete piles A in the unrestricted area of the foundation pit, wherein the depth of the first-layer earth excavation is less than 2 meters, correcting the working surface of the first-layer concrete piles A, binding reinforcing steel meshes a between the first-layer concrete piles A, implanting reinforcing ribs, and spraying high-grade concrete to the reinforcing steel meshes through concrete spraying equipment until the whole first-layer concrete retaining wall C is formed.
After the curing time of the first layer of concrete retaining wall exceeds seven days, the second layer of slope blocking construction is carried out, the second layer of earthwork is excavated through equipment, and the edge soil slope excavated by the second layer of slope repairing equipment is used for repairing the slope, so that the second layer of soil slope forms a slope surface.
Through drilling equipment, establish anchor eye on the second floor soil slope, place reinforcing bar net piece b on the second floor soil slope, the anchor eye is along the length and the width direction array arrangement multiunit of second floor soil slope, set up stock D in the anchor eye, through the fixer, implement the fixed combination to stock D and reinforcing bar net piece b, spray high-grade concrete on the reinforcing bar net piece b through the concrete spraying equipment, until the second time soil slope forms a slope and keeps off slope D.
Reinforcing segments are reserved on a reinforcing mesh b of the second-layer concrete retaining slope in advance, the reinforcing segments are arranged along the inclined plane inclined direction of the second-layer soil slope, multiple groups of reinforcing segments are arranged at intervals along the length direction of the inclined plane of the second-layer soil slope, steel frame reinforcing cages are bound on the second-layer soil slope in advance, the steel frame reinforcing cages are arranged along the length direction of the reinforcing segments, a formwork is supported on the periphery of the reinforcing mesh b in advance, and high-specification concrete is sprayed into a die cavity, so that longitudinal reinforcing ribs E are formed on the second-layer soil retaining slope.
According to the depth of the foundation pit, the number of layers of inclined plane retaining slopes is reasonably planned to form a third layer of inclined plane retaining slope and a fourth layer of inclined plane retaining slope, a platform is formed between each layer of inclined plane retaining slopes, a reinforced mesh is paved on the platform, concrete is poured to form a supporting plane F, a mechanical channel is reserved in the unrestricted area, and mechanical equipment can enter or exit conveniently.
And finishing the foundation pit surface in the limited area of the foundation pit, drilling a pile hole at the bottom of the foundation pit, hoisting a reinforcement cage in the pile hole, pouring high-standard concrete into the pile hole to form a pile table, and reliably fixing the support base 300 on the pile table of the foundation pit by using a fixed anchor rod 390 so as to stably support the support base 300.
The limited area of the foundation pit is mainly limited by mountain bodies, buildings and water source areas, so that when the foundation pit of the limited area is supported, construction cannot be carried out according to the foundation pit support of the non-limited area.
The structure and connection of the main support plate 100, the sub support plate 200 and the support base 300 according to the present invention will be described in detail as follows:
as shown in fig. 3-4, in this embodiment, a schematic structural diagram of a self-stabilizing foundation pit supporting structure is provided when the self-stabilizing foundation pit supporting structure is integrally folded, unfolded and supported on the side wall of the foundation pit, the supporting structure of this embodiment includes a main supporting plate 100 and a sub supporting plate 200, the main supporting plate 100 is connected with a driving mechanism, the driving mechanism drives the main supporting plate 100 to horizontally move and to abut against or separate from the side wall of the foundation pit, the main supporting plate 100 is provided with the sub supporting plate 200, the sub supporting plate 200 is connected with a linkage mechanism, the linkage mechanism drives the sub supporting plate 200 to combine with or separate from the main supporting plate 100, when the sub supporting plate 200 is in a combined state with the main supporting plate 100, the sub supporting plate 200 and the main supporting plate 100 form a whole plate, when the sub supporting plate 200 is in a separated state with the main supporting plate 100, and the sub supporting plate 200 and the main supporting plate 100 are respectively used to abut against the side wall of the foundation pit.
When the foundation pit supporting in the limited space is implemented, the main supporting plate 100 and the auxiliary supporting plate 200 are hoisted into the foundation pit through equipment, the main supporting plate 100 and the auxiliary supporting plate 200 are connected through a driving mechanism and a linkage mechanism, after the main supporting plate 100 and the auxiliary supporting plate 200 are hoisted into the foundation pit, the main supporting plate 100 and the auxiliary supporting plate 200 are in a folded state, the auxiliary supporting plate 200 and the main supporting plate 100 are separated through the linkage mechanism, so that the supporting area of the inner wall of the foundation pit is remarkably increased, the main supporting plate 100 is driven to approach the inner wall of the foundation pit through the driving mechanism, the supporting of the inner wall of the foundation pit is realized, the reliability of the supporting of the foundation pit can be further ensured, the supporting system can facilitate the supporting operation of the foundation pit in the limited space, the construction difficulty of the foundation pit construction operation is reduced, the construction efficiency of the foundation pit is improved, the subsequent supporting and the operations such as disassembling are convenient.
The auxiliary supporting guard plates 200 and the main supporting guard plates 100 can be correspondingly combined according to the size of the foundation pit, the auxiliary supporting guard plates 200 and the main supporting guard plates 100 are hoisted below the foundation pit through hoisting equipment, and can be assembled on site and then effectively supported.
When the equipment is hoisted below the foundation pit, the main support plate 100 and the auxiliary support plate 200 are unfolded or folded according to actual use conditions and used according to the conditions of the foundation pit, the combined tightness of the main support plate 100, the auxiliary support plate 200 and the inner wall of the foundation pit is adjusted according to the conditions of the foundation pit, and then the supporting conditions of the foundation pit can be adjusted.
As a preferable solution of this embodiment, the outer sides of the main support plate 100 and the auxiliary support plate 200 combined with the foundation pit are in arc plate shape, and the centers of the arc surfaces of the outer sides of the main support plate 100 and the auxiliary support plate 200 are concentrically arranged.
When the linkage mechanism expands the auxiliary support plate 200 and the main support plate 100, the auxiliary support plate 200 expands around the circle to increase the combined area with the inner wall of the foundation pit, so as to reliably support the foundation pit, and the auxiliary support plate 200 and the main support plate 100 are fully distributed around the foundation pit according to the actual use condition, so as to complete the support of the inner wall of the foundation pit; when the foundation pit is disassembled after construction, the auxiliary support plate 200 and the main support plate 100 are folded through the linkage mechanism, and the auxiliary support plate 200, the main support plate 100 and the inner wall of the foundation pit are far away from each other through the starting driving mechanism, so that the support is disassembled and assembled conveniently.
Specifically, when the driving of the sub-support plate 200 is performed, the interlocking mechanism drives the sub-support plate 200 to rotate around the center of the outer arc surface and to be combined with or separated from the main support plate 100.
The main support plate 100 is arranged on the support base 300, the support base 300 is arranged at the pit bottom of the foundation pit, the support base 300 is connected with one end of an anchor rope 400, and the anchor rope 400 extends out of the opening of the foundation pit and is connected with an anchor rod 500 outside the foundation pit.
In combination with fig. 4 and 5, in order to ensure the reliability of supporting the deep foundation pit, the supporting seat body 300 is placed at the bottom of the foundation pit through hoisting equipment, the supporting seat body 300 is connected through the anchor rope 400, and the anchor rope 400 extends out of the opening of the foundation pit, so that one end of the anchor rope 400 is fixedly connected with the anchor rod 500 on the outer side, the anchoring of the main support plate 100 is completed, the auxiliary support plate 200 is abutted against the inner wall of the foundation pit with the main support plate 100, the upper end, the lower end and the side face of the supporting seat body 300 are reliably connected with the foundation pit, when the problem of collapse and the like of the foundation pit occurs, the effective bearing of a collapse point of the foundation pit can be effectively implemented through the upper and lower connection and the blocking of the side face, and the safety of foundation pit construction is ensured.
More preferably, as shown in fig. 3 and 6, the secondary support plate 200 includes a first secondary support plate 210 and a second secondary support plate 220, the first secondary support plate 210 is provided with a receiving opening 211 for receiving the main support plate 100, an inner side plate surface of two side plates of the receiving opening 211 is provided with a sliding rail 212, the second secondary support plate 220 is provided with a sliding support plate 221, and the sliding support plate 221 is slidably disposed on the sliding rail 212.
To perform the unfolding and folding of the auxiliary support plate 200 and the main support plate 100, the main support plate 100 is installed in the receiving opening 211 on the first auxiliary support plate 210, and the second auxiliary support plate 220 is slidably disposed on the sliding rail 212 through the sliding support plate 221, when the auxiliary support plate 200 and the main support plate 100 are unfolded or folded, the sliding support plate 221 slides on the sliding rail 212, so as to facilitate the unfolding and folding of the auxiliary support plate 200 and the main support plate 100.
Preferably, as shown in fig. 3 and 10, when the main support plate 100 is driven horizontally, the main support plate 100 is made to approach or separate from the inner wall of the foundation pit, the driving mechanism comprises a connecting push head 510 arranged on the inner side of the main support plate 100, the connecting push head 510 is connected with a driving screw rod 520, the driving screw rod 520 is horizontally arranged and matched with a driving nut 530, the driving nut 530 is rotatably arranged on a support frame 540, and a power unit is used for driving the driving nut 530 to rotate.
By starting the power unit, the driving nut 530 is rotated, so that the translational driving of the driving screw 520 is realized, and the horizontal driving of the main support plate 100 is further realized, so that the approach or the separation of the inner wall of the foundation pit is realized.
When driving the driving screw 520, one end of the driving nut 530 is mounted at one end of the turntable of the thrust bearing, the driving nut 530 is mounted on the driving gear 531, the driving gear 531 is meshed with the power gear 532, the power gear 532 is connected to an output shaft of the hydraulic motor 533, and the hydraulic motor 533 and the thrust bearing are mounted on the support frame 540.
When the driving nut 530 is rotatably supported, the driving nut 530 is supported by the thrust bearing, and the hydraulic motor 533 is started to drive the driving gear 531 by linking the rotation of the power gear 532, so that the driving screw 520 is driven, the driving screw 520 is in a horizontally moving state, and the main support plate 100 is driven or finely adjusted.
More specifically, as shown in fig. 3, 7 and 12, in order to implement the connection between the driving screw 520 and the main support plate 100, the connection pusher 510 includes a connection frame plate 511, the inner side of the main support plate 100 is hinged to one end of the connection arm 512, two connection arms 512 are provided, and the two connection arms 512 are integrally arranged in a splayed shape, the other end of the connection arm 512 is hinged to the connection frame plate 511, the hinge shafts at the two ends of the connection arm 512 are vertically arranged, a support conduit 513 is provided on the connection frame plate 511, the support conduit 513 is horizontally and vertically arranged with the inner side of the main support plate 100, a support spring 514 is provided in the support conduit 513, a support pin 515 is provided in the support spring 514, the support pin 515 is slidably arranged in the support conduit 513, two ends of the support spring 514 are respectively abutted against one end of the support pin 515 and one end of the support conduit 513, one end of the support pin 515 extending out of the support conduit 513 is provided with a support ball 5151, and the support ball 5151 is abutted against the inner side of the main support plate 100.
When used to actuate the main support plate 100 such that the main support plate 100 abuts against the interior wall of the foundation pit, the support balls 5151 abut against the interior side of the main support plate 100 and compress the support springs 514 until the connecting arms 512 press the entire main support plate 100, thereby achieving reliable abutment of the main support plate 100 against the interior wall of the foundation pit and ensuring reliability of foundation pit support, as shown in fig. 7 and 8.
In order to realize reliable linkage between the first auxiliary support plate 210 and the second auxiliary support plate 220 in the auxiliary support plate 200 and the main support plate 100, the linkage mechanism comprises a first connecting rod 230 arranged on the inner side of the first auxiliary support plate 210, one end of the first connecting rod 230 is hinged with the inner side plate of the first auxiliary support plate 210, the other end of the first connecting rod 230 is hinged with a second connecting rod 240, the hinge shafts on the two ends of the first connecting rod 230 are vertical, the inner side of the second auxiliary support plate 220 is hinged with one end of a first support rod 250, the other end of the first support rod 250 is hinged with a second support rod 260, the hinge shafts on the two ends of the first support rod 250 are vertical, and the rod ends of the second connecting rod 240 and the second support rod 260 are respectively hinged with a support rod 270.
The above-mentioned sub-support plate 200 is connected with the first sub-support plate 210 and the second sub-support plate 220, when the driving mechanism drives the main support plate 100 to move horizontally, the first sub-support plate 210 and the second sub-support plate 220 link the first link 230 and the first support rod 250 to move, the first link 230 and the first support rod 250 link the second link 240 and the second support rod 260 to move, so as to realize the unfolding of the sub-support plate 200 and the first sub-support plate 210 and the second sub-support plate 220, and to realize the approaching to the inner wall of the foundation pit, when the support is completed or needs to be adjusted, the driving mechanism is used to make the main support plate 100 move away from the foundation pit, link the first link 230 and the first support rod 250 to rotate, and to present a folding state with the second link 240 and the second support rod 260, so as to implement the driving of the links.
More specifically, to achieve the unfolding and the storage of the first and second sub-supporting plates 210 and 220, the second link 240 and the second supporting rod 260 are coaxially arranged with the hinge ends of the supporting rods 270, and the lower ends of the supporting rods 270 are connected with the supporting base 300.
As shown in fig. 15 and 16, in order to implement the unfolding and folding of the first sub-support plate 210 and the second sub-support plate 220 and the main support plate 100, two toggle rods 280 are vertically disposed in the region between the inner sides of the second link 240 and the second support rod 260, the two toggle rods 280 are respectively disposed at one end of the driving arm 290, one end of the driving arm 290 is connected with a piston rod of the driving cylinder 291, the piston rod of the driving cylinder 291 is horizontally disposed, the rod bodies of the two toggle rods 280 are respectively abutted against or separated from the inner side walls of the second link 240 and the second support rod 260, when the driving cylinder 291 drives the two toggle rods 280 to approach the cylinder body, the included angle between the second link 240 and the second support rod 260 is in a state of being increased, and when the driving cylinder 291 drives the two toggle rods 280 to be away from the cylinder body, the included angle between the second link 240 and the second support rod 260 is in a state of being decreased.
When the unfolding operation of the first and second subsidiary support plates 210 and 220 and the main support plate 100 is performed, the driving cylinder 291 drives the two toggle rods 280 to approach the cylinder body, so that the included angle between the second connecting rod 240 and the second support rod 260 is in a larger state, and further, the first and second subsidiary support plates 210 and 220 and the main support plate 100 are in a unfolded state, and when the folding operation of the first and second subsidiary support plates 210 and 220 and the main support plate 100 is performed, the driving cylinder 291 drives the two toggle rods 280 to depart from the cylinder body, so that the included angle between the second connecting rod 240 and the second support rod 260 is in a smaller state, and further, the first and second subsidiary support plates 210 and 220 and the main support plate 100 are in a folded state.
More preferably, when the first auxiliary support plate 210, the second auxiliary support plate 220 and the main support plate 100 are folded, two driving levers 292 are further disposed on the driving arm 290, the two driving levers 292 are vertically disposed, the two driving levers 292 are disposed in a region between the outer sides of the second connecting rod 240 and the second support plate 260, the two driving levers 292 respectively abut against or separate from the outer side walls of the second connecting rod 240 and the second support plate 260, and when the driving cylinder 291 drives the two driving levers 292 to be away from the cylinder body, the included angle between the second connecting rod 240 and the second support plate 260 is in a reduced state, so that the first auxiliary support plate 210, the second auxiliary support plate 220 and the main support plate 100 are in a folded state.
Preferably, in order to drive the driving arm 290, one end of the driving arm 290 is hinged to the driving slider 293, the hinge shaft of the driving arm 290 is vertically arranged, a stop lever 294 is extended on the driving slider 293, and the stop lever 294 is vertically arranged and the rod body is abutted against or separated from the outer side of the driving arm 290.
When the first sub-support plate 210 and the second sub-support plate 220 are folded with the main support plate 100, the stop rod 294 is vertically arranged and the rod body is abutted against the outer side of the driving arm 290, so that the included angle between the second connecting rod 240 and the second support rod 260 can be linked to be in a reduced state, and the folding of the first sub-support plate 210 and the second sub-support plate 220 with the main support plate 100 is ensured.
More preferably, in order to implement further support adjustment on the foundation pit wall, the flexibility of the support structure is improved, one side of the first auxiliary support plate 210 is hinged with a support adjustment plate 600, the hinge shaft of the support adjustment plate 600 is vertically arranged, and a support angle adjustment unit is arranged on the first auxiliary support plate 210 and is used for adjusting an included angle between the support adjustment plate 600 and the first auxiliary support plate 210.
Referring to fig. 6 and fig. 13-14, in order to implement the adjustment of the angle of the support adjustment plate 600, the upper end and the lower end of the support adjustment plate 600 are respectively provided with an adjustment rail 610, the support angle adjustment unit includes an adjustment wheel 620 disposed in the adjustment rail 610, the wheel core of the adjustment wheel 620 is vertically disposed, the adjustment wheel 620 is rotatably disposed at one end of an adjustment arm 630, the other end of the adjustment arm 630 is rotatably disposed on the first sub-support plate 210, the rotation axis of the adjustment arm 630 is vertical, the middle section of the adjustment arm 630 is hinged to the piston rod of the adjustment cylinder 640, and the piston rod of the adjustment cylinder 640 is horizontally disposed.
The first auxiliary supporting plate 210, the second auxiliary supporting plate 220 and the main supporting plate 100 are respectively provided with a detachable maintenance baffle at the upper ends thereof, so as to facilitate the lifting and the disassembly.
More preferably, the support base 300 includes a first base 310 and a second base 320, the lower end of the support rod 270 is fixed on the first base 310, the second base 320 and the first base 310 form a sliding fit in a horizontal direction, and the lower ends of the first sub-support plate 210 and the second sub-support plate 220 are matched with the second base 320.
Referring to fig. 9, the second base 320 and the first base 310 form a sliding fit in a horizontal direction, and the lower ends of the first auxiliary support plate 210 and the second auxiliary support plate 220 are matched with the second base 320, so that when the side walls of the foundation pit of the first auxiliary support plate 210 and the second auxiliary support plate 220 are close to each other, the first auxiliary support plate 210 and the second auxiliary support plate 220 can be reliably supported when being translated;
as shown in fig. 11, a first supporting rod 330 is disposed at the lower end of the hinge shaft between the first auxiliary supporting plate 210 and the supporting adjustment plate 600, a second supporting rod 340 is disposed at the lower end of the second auxiliary supporting plate 220, a first supporting groove plate 350 and a second supporting groove plate 360 are disposed on the second seat 320, the lower end of the first supporting rod 330 is combined with the first supporting groove plate 350, and the lower end of the second supporting rod 340 is combined with the second supporting groove plate 360.
As shown in fig. 9, in order to support the first and second sub-support plates 210 and 220, balls 370 are disposed on the sides and lower ends of the first and second support rods 330 and 340, the first and second support plates 350 and 360 are integrally in a strip shape, the balls 370 abut against the bottoms and walls of the grooves of the first and second support plates 350 and 360, and one ends of the first and second support plates 350 and 360 are hinged to the second base 320 and the hinge shaft is vertically disposed.
As shown in fig. 4, in order to reliably combine the first auxiliary supporting plate 210, the second auxiliary supporting plate 220 and the main supporting plate 100 with the inner wall of the foundation pit to form a stable and reliable stress structure for use in cooperation with the anchoring of the anchor rods 500 and the anchor ropes 400, so as to ensure reliable supporting of the foundation pit, a second inserting wedge block 380 is disposed on one side of the first supporting groove plate 350 and one side of the second supporting groove plate 360, a first inserting wedge block 120 is disposed on the outer side of the main supporting plate 100 in an array manner, and fixing anchor rods 390 which form an inserting fit with the bottom of the foundation pit are disposed around the first seat body 310.
Preferably, the supporting frame 540 on the supporting seat 300 is provided with an anchoring bracket 410, one end of the anchoring bracket 410 is hinged to the upper end of the supporting frame 540, one end of the Mao Sheng is connected with one end of the anchoring bracket 410, and the other end of the anchor rope 400 is vertically downward and connected with the anchor rod 500.
As shown in fig. 4, in order to connect the anchor rope 400 and the anchor rod 500, the anchor bracket 410 is provided with a pressing roller 420, the center of the pressing roller 420 is horizontal, the pressing roller 420 abuts against the upper end of the support frame 540, the anchor rope 400 includes two groups of anchor rope sections, one ends of the two groups of anchor rope sections are respectively connected with the anchor bracket 410 and the anchor rod 500, the other ends of the two groups of anchor rope sections are respectively connected with the anchor screw 430, and the two groups of anchor screw 430 are respectively matched with the pipe openings at two ends of the anchor screw 440.
The above embodiments are only for illustrating the technical method of the present invention and not for limiting the same, and it should be understood by those skilled in the art that the technical method of the present invention may be modified or substituted without departing from the spirit and scope of the technical method of the present invention.
Claims (10)
1. A supporting method of a foundation pit in a limited space is characterized by comprising the following steps: the method comprises the following steps:
firstly, digging a plurality of groups of embedded grooves around a foundation pit, and drilling holes in the embedded grooves through drilling equipment;
secondly, penetrating the anchor rod (500) into the drill hole, and forming a stable anchoring point by pouring concrete;
Thirdly, transferring the whole main support plate (100), the auxiliary support plate (200) and the support base body (300) into a foundation pit through equipment, and reliably fixing the support base body (300) at the bottom of the foundation pit by using a fixing anchor rod (390);
a fourth step of starting a driving mechanism to enable the main support plate (100) to horizontally move and to be close to the side wall of the foundation pit, enabling the main support plate (100) to initially support a part of the side wall of the foundation pit, stopping the driving mechanism, and enabling the main support plate (100) to stop horizontally moving;
fifthly, starting a linkage mechanism to separate the auxiliary support plate (200) from the main support plate (100) so as to realize the unfolding of the auxiliary support plate (200) and enable the auxiliary support plate (200) to be close to the side wall of the foundation pit;
sixthly, continuously starting the driving mechanism to enable the main support plate (100) to continuously move horizontally, enabling the main support plate (100) and the auxiliary support plate (200) to be close to and abut against the side wall of the foundation pit, and further applying acting force to reliably support the side wall of the foundation pit;
and seventh, fixing the anchor rope (400) on the support seat body (300), connecting the other end of the anchor rope (400) with the anchor rod (500), and realizing the construction of the whole support structure by adjusting the tension of the anchor rope (400).
2. The method for supporting a foundation pit in a confined space according to claim 1, wherein: when the foundation pit is dug, firstly, holes are drilled on the edge of an unrestricted area of the foundation pit, holes are formed to the design depth, the holes are cleared, the thickness of sediment at the bottom of the holes is not more than one decimeter, a reinforcement cage is poured down, concrete is poured, after the concrete pile is formed, a formwork is supported at the upper end of the concrete pile, and then crown beam construction is carried out.
3. The method for supporting a foundation pit in a confined space according to claim 2, wherein: and (3) carrying out first-layer earth excavation on the edges of the concrete piles in the unrestricted area of the foundation pit, wherein the depth of the first-layer earth excavation is less than 2 meters, correcting the working surface of the first-layer concrete piles, binding reinforcing steel meshes between the first-layer concrete piles, implanting reinforcing ribs, and spraying high-grade concrete to the reinforcing steel meshes through concrete spraying equipment until the whole first-layer concrete retaining wall is formed.
4. A method of supporting a foundation pit in a confined space as claimed in claim 3, wherein: after the curing time of the first layer of concrete retaining wall exceeds seven days, carrying out second layer of slope blocking construction, excavating a second layer of earthwork through equipment, and carrying out slope repairing on edge soil slopes excavated by the second layer of slope repairing equipment so that the second layer of soil slopes form slope faces.
5. The method for supporting a foundation pit in a confined space according to claim 4, wherein: through drilling equipment, establish the anchor eye on the second floor soil slope, place the reinforcing bar net piece on the second floor soil slope, the anchor eye is along the length and the width direction array arrangement multiunit of second floor soil slope, set up stock (500) in the anchor eye, through the fixer, implement the fixed combination to stock (500) and reinforcing bar net piece, spray high-grade concrete on the reinforcing bar net piece through concrete spraying equipment, until the second time soil slope forms an inclined plane and keeps off the slope.
6. The method for supporting a foundation pit in a limited space according to claim 5, wherein: the reinforcing mesh of the second-layer concrete retaining slope is reserved with reinforcing sections in advance, the reinforcing sections are arranged along the inclined plane inclined direction of the second-layer soil slope, multiple groups of reinforcing sections are arranged along the inclined plane length direction of the second-layer soil slope at intervals, steel frame reinforcing cages are bound on the second-layer soil slope in advance, the steel frame reinforcing cages are arranged along the length direction of the reinforcing sections, forms are supported on the periphery of the reinforcing cages in advance, and high-specification concrete is sprayed into the die cavity, so that longitudinal reinforcing ribs are formed on the second-layer soil retaining slope.
7. The method for supporting a foundation pit in a confined space according to claim 6, wherein: according to the depth of the foundation pit, the number of layers of inclined plane retaining slopes is reasonably planned to form a third layer of inclined plane retaining slopes and a fourth layer of inclined plane retaining slopes, a platform is formed between each layer of inclined plane retaining slopes, a reinforced mesh is paved on the platform, concrete is poured to form a supporting plane, and a mechanical channel is reserved in the unrestricted area, so that mechanical equipment can enter or exit conveniently.
8. The method for supporting a foundation pit in a confined space according to claim 7, wherein: and finishing the foundation pit surface in the limited area of the foundation pit, drilling a pile hole at the bottom of the foundation pit, hoisting a reinforcement cage in the pile hole, pouring high-standard concrete into the pile hole to form a pile table, and reliably fixing the support seat body (300) on the pile table of the foundation pit by utilizing a fixed anchor rod (390) so as to stably support the support seat body (300).
9. A method of supporting a foundation pit in a confined space according to any one of claims 1 to 8, wherein: in the third step, the main support plate (100) is connected with a driving mechanism, and the driving mechanism drives the main support plate (100) to horizontally move to the side wall of the foundation pit to be abutted or separated;
An auxiliary support plate (200) is arranged on the main support plate (100), and the auxiliary support plate (200) is connected with the linkage mechanism;
the outer sides of the main support plate (100) and the auxiliary support plate (200) combined with the foundation pit are integrally arc-shaped, and the circle centers of the outer arc-shaped surfaces of the main support plate (100) and the auxiliary support plate (200) are concentrically arranged; the linkage mechanism drives the auxiliary support plate (200) to rotate around the circle center of the outer arc surface and be combined with or separated from the main support plate (100);
the main support plate (100) is arranged on the support base body (300), the support base body (300) is arranged at the pit bottom of the foundation pit, the support base body (300) is connected with one end of an anchor rope (400), and the other end of the anchor rope (400) extends out of an opening of the foundation pit and is connected with an anchor rod (500) outside the foundation pit.
10. The method for supporting a foundation pit in a confined space according to claim 9, wherein: the auxiliary supporting plate (200) comprises a first auxiliary supporting plate (210) and a second auxiliary supporting plate (220), and an accommodating opening (211) for accommodating the main supporting plate (100) is formed in the first auxiliary supporting plate (210); the second auxiliary supporting guard plate (220) is connected with the first auxiliary supporting guard plate (210) in a sliding manner;
the driving mechanism comprises a connecting push head (510) arranged on the inner side of the main support plate (100), the connecting push head (510) drives a screw rod (520) to be connected, the driving screw rod (520) is meshed with a driving nut (530), and the driving nut (530) is rotatably arranged on a support frame (540) and driven to rotate by a power unit;
The linkage mechanism comprises a first connecting rod (230) arranged on the inner side of the first auxiliary supporting plate (210), one end of the first connecting rod (230) is hinged with the inner side plate of the first auxiliary supporting plate (210), the other end of the first connecting rod (230) is hinged with a second connecting rod (240), and the hinged shafts at the two ends of the first connecting rod (230) are vertical; the inner side of the second auxiliary support plate (220) is hinged with one end of a first support rod (250), the other end of the first support rod (250) is hinged with a second support rod (260), the hinge shafts at the two ends of the first support rod (250) are vertical, and the rod ends of the second connecting rod (240) and the second support rod (260) are respectively hinged with a support rod (270);
the second connecting rod (240) and the second bracket rod (260) are coaxially arranged with the hinged end of the supporting rod (270), and the lower end of the supporting rod (270) is connected with the supporting seat body (300);
two poking rods (280) are vertically arranged in the area between the second connecting rod (240) and the inner side of the second bracket rod (260), the two poking rods (280) are arranged at one end of a driving arm (290), and the other end of the driving arm (290) is connected with a piston rod of a driving oil cylinder (291); the rod bodies of the two poking rods (280) are respectively abutted against or separated from the inner side walls of the second connecting rod (240) and the second bracket rod (260),
The driving arm (290) is further provided with two driving deflector rods (292), the two driving deflector rods (292) are vertically arranged, the two driving deflector rods (292) are arranged in the area between the outer sides of the second connecting rod (240) and the second support rod (260), and the rod bodies of the driving deflector rods (292) are respectively abutted against or separated from the outer side walls of the second connecting rod (240) and the second support rod (260).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310559007.6A CN116497836A (en) | 2023-05-16 | 2023-05-16 | Supporting method for foundation pit in limited space |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310559007.6A CN116497836A (en) | 2023-05-16 | 2023-05-16 | Supporting method for foundation pit in limited space |
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| Publication Number | Publication Date |
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| CN116497836A true CN116497836A (en) | 2023-07-28 |
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| CN202310559007.6A Pending CN116497836A (en) | 2023-05-16 | 2023-05-16 | Supporting method for foundation pit in limited space |
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| Country | Link |
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| CN (1) | CN116497836A (en) |
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2023
- 2023-05-16 CN CN202310559007.6A patent/CN116497836A/en active Pending
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