CN116305499B - Plane layout method and device based on prestress fish belly type steel support system - Google Patents
Plane layout method and device based on prestress fish belly type steel support system Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 70
- 239000010959 steel Substances 0.000 title claims abstract description 70
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- 241000251468 Actinopterygii Species 0.000 title claims description 92
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- 230000015654 memory Effects 0.000 claims description 30
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- 238000004891 communication Methods 0.000 claims description 10
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 abstract description 58
- 238000013461 design Methods 0.000 abstract description 11
- 238000004088 simulation Methods 0.000 description 13
- 238000004458 analytical method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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- 230000009467 reduction Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
Abstract
The invention discloses a plane layout method and a plane layout device based on a prestress fish-bellied steel support system, wherein the method comprises the following steps: acquiring foundation pit size and angle support data, and constructing angle support balance conditions according to the angle support data; determining the opposite bracing arrangement parameters of the foundation pit by utilizing the foundation pit size and the angle brace balance condition; and carrying out plane layout on the foundation pit through the opposite bracing arrangement parameters. The method solves the problem of overlarge planar arrangement displacement of the prestressed fish-web girder supporting system, explores the rule that the horizontal displacement of the foundation pit changes along with the size of the fish-web girder according to the principle that the horizontal displacement in the pit of the plane of the foundation pit is minimized by reasonable arrangement, obtains the relation formula between the optimal specification of the prestressed fish-web girder structure and the size of the foundation pit, and finally can obtain the reasonable size of the fish-web girder structure according to the size of the foundation pit, thereby better performing planar arrangement and structural design and achieving the aim of better controlling the horizontal displacement of the foundation pit.
Description
Technical Field
The invention relates to the technical field of intelligent buildings, in particular to a plane layout method and device based on a prestress fish belly type steel support system.
Background
Along with the continuous utilization of urban and underground space, the construction of high-rise buildings, the construction of large municipal facilities and the development of a large amount of underground space promote the rapid development of foundation pit engineering, related engineering technologies gradually mature, the foundation pit engineering shows the development trend of large, tight, deep, near and the like, the foundation pit engineering gradually shows the characteristics of rapid development, wide distribution area, large foundation pit area, deep depth, complex surrounding environment and the like, more and more large deep foundation pit engineering needs safe, convenient, rapid and economic support technology, and the technical means of the foundation pit engineering are improved and innovated. The prestress fish belly type steel supporting technology is successfully applied to a series of projects nationwide through research and development and experimental study. The technology can realize reliable control of foundation pit deformation, realize recovery and reuse of supporting materials, and achieve the aims of green support, energy conservation and consumption reduction of foundation pit engineering.
However, the prestress fish-bellied steel support system is used as a steel support technology, is relatively late to introduce, start and develop in China, is not perfect in research on theory and application, is excessively dependent on experience of designers in plane layout, and needs finite element simulation assistance, so that difficulty of a construction unit in design and use is high. In practical engineering application, the problem of overlarge foundation pit displacement at the corner support often occurs.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a plane layout method and a plane layout device based on a prestress fish-bellied steel support system, which solve the problem of overlarge foundation pit displacement at a corner brace caused by the prior art.
According to a first aspect, an embodiment of the present invention provides a method for laying a plane based on a prestressed fish-bellied steel support system, including:
acquiring foundation pit size and angle support data, and constructing angle support balance conditions according to the angle support data;
determining a bracing arrangement parameter of the foundation pit by utilizing the foundation pit size and the angle brace balance condition;
and carrying out plane layout on the foundation pit through the opposite bracing arrangement parameters.
According to the plane layout method based on the prestress fish belly type steel support system, the problem that the plane layout displacement of the prestress fish belly type steel support system is overlarge is solved, according to the principle that the horizontal displacement in the pit of the foundation pit plane is minimized by reasonable layout, finite element simulation and finite element analysis are carried out on the foundation pit plane through numerical software, the change condition of the horizontal displacement of the foundation pit is checked and compared, the rule that the horizontal displacement of the foundation pit changes along with the size of the fish belly type steel support system is explored, the relation formula between the optimal specification of the prestress fish belly type steel support system and the size of the foundation pit is obtained, and finally the reasonable size of the fish belly type steel support system can be obtained according to the size of the foundation pit, so that plane layout and structural design are better carried out, and the purpose of controlling the horizontal displacement of the foundation pit is achieved better.
With reference to the first aspect, in a first implementation manner of the first aspect, the constructing a gusset balance condition according to the gusset data includes: the gusset data comprises a gusset edge length, a short edge support range and a long edge support range of the foundation pit,
setting the angle of the gusset;
and determining balance conditions at two ends of the angle brace according to preset uniform load, angle of the angle brace, length of the edge of the angle brace, short-side supporting range and long-side supporting range.
With reference to the first embodiment of the first aspect, in a second embodiment of the first aspect, the two-end balance condition of the gusset is expressed by the following formula:
（m+a1）*q=（m+b1）*q→a1=b1
wherein q is the preset uniform load, m is the length of the side of the angle brace, a1 is the short side supporting range, and b1 is the long side supporting range.
With reference to the second embodiment of the first aspect, in a third embodiment of the first aspect, the determining the diagonal bracing arrangement parameter of the foundation pit by using the foundation pit size and the gusset balance condition includes: the foundation pit size comprises a long side size of the foundation pit and a short side size of the foundation pit, wherein,
calculating the aspect ratio of the foundation pit according to the long side size of the foundation pit and the short side size of the foundation pit;
constructing a layout relation formula of the size of the fish belly sill and the size of the foundation pit;
and determining the aspect ratio of the foundation pit and the layout relation formula as a diagonal bracing arrangement parameter.
With reference to the third implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the constructing a layout relation formula of a dimension of a fish web beam and a dimension of a foundation pit includes:
analyzing and processing the size of the fish belly sill and the size of the foundation pit, and determining a change formula of the size of the fish belly sill and the size of the foundation pit;
the change formula is described by the following formula:
L=0.0044a 2 +0.4297a
the dimension of the fish web beam is L, and a is the dimension of the foundation pit;
acquiring a critical value of the prestressed fish-web girder of the foundation pit according to the span type and the size of the foundation pit;
and correcting the change formula by using the prestressed fish web girder according to the span type and the critical value of the foundation pit size, and determining the layout relation formula.
With reference to the third implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the layout relation formula is represented by the following formula:
wherein L is the size of the fish web girder, a is the size of the foundation pit, and a 0 Is the critical value of the foundation pit size.
With reference to the third implementation manner of the first aspect, in a sixth implementation manner of the first aspect, the performing planar layout on the foundation pit by using the diagonal bracing arrangement parameter includes:
dividing the foundation pit according to the aspect ratio of the foundation pit and preset requirements, and determining a division result;
and calculating the segmentation result by using the foundation pit size and the layout relation formula to obtain the size of the fish belly sill.
According to the plane layout method based on the prestress fish belly type steel support system, the problem that the plane layout displacement of the prestress fish belly type steel support system is overlarge is solved, according to the principle that the horizontal displacement in the pit of the foundation pit plane is minimized by reasonable layout, finite element simulation and finite element analysis are carried out on the foundation pit plane through numerical software, the change condition of the horizontal displacement of the foundation pit is checked and compared, the rule that the horizontal displacement of the foundation pit changes along with the size of the fish belly type steel support system is explored, the relation formula between the optimal specification of the prestress fish belly type steel support system and the size of the foundation pit is obtained, and finally the reasonable size of the fish belly type steel support system can be obtained according to the size of the foundation pit, so that plane layout and structural design are better carried out, and the purpose of controlling the horizontal displacement of the foundation pit is achieved better.
According to a second aspect, the plane layout device based on the prestress fish belly type steel support system provided by the embodiment of the invention comprises:
the first processing module is used for acquiring the foundation pit size and the angle support data and constructing angle support balance conditions according to the angle support data;
the second processing module is used for determining the opposite bracing arrangement parameters of the foundation pit by utilizing the foundation pit size and the angle brace balance condition;
and the third processing module is used for carrying out plane layout on the foundation pit through the opposite bracing arrangement parameters.
According to the plane layout device based on the prestress fish web type steel support system, the problem that the plane layout displacement of the prestress fish web type steel support system is overlarge is solved, according to the principle that the horizontal displacement in the pit of the foundation pit plane is minimized by reasonable layout, finite element simulation and finite element analysis are carried out on the foundation pit plane through numerical software, the change condition of the horizontal displacement of the foundation pit is checked and compared, the rule that the horizontal displacement of the foundation pit changes along with the size of the fish web type steel support system is explored, the relation formula between the optimal specification of the prestress fish web type steel support system and the size of the foundation pit is obtained, and finally the reasonable size of the fish web type steel support system can be obtained according to the size of the foundation pit, so that the plane layout and the structural design are better carried out, and the purpose of better controlling the horizontal displacement of the foundation pit is achieved.
According to a third aspect, an embodiment of the present invention provides an electronic device, including: the device comprises a memory and a processor, wherein the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions so as to execute the plane layout method based on the prestress fish-web type steel support system in the first aspect or any implementation mode of the first aspect.
According to a fourth aspect, an embodiment of the present invention provides a computer readable storage medium storing computer instructions for causing the computer to perform the method for laying out a plane based on a pre-stressed fish-web steel support system according to the first aspect or any one of the embodiments of the first aspect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of planar layout based on a pre-stressed fish-web steel support system in accordance with an embodiment of the invention;
FIG. 2 is a schematic illustration of force balance at a gusset in accordance with a preferred embodiment of the present invention;
FIG. 3 is a first intermediate section layout schematic in accordance with a preferred embodiment of the present invention;
FIG. 4 is a second intermediate section layout schematic in accordance with a preferred embodiment of the present invention;
FIG. 5 is a third intermediate section layout schematic in accordance with a preferred embodiment of the invention;
fig. 6 is a graph of a maximum displacement of a 30m x 30m foundation pit according to a preferred embodiment of the present invention;
FIG. 7 is a graph of optimal gusset right angle side lengths for different foundation pits in accordance with a preferred embodiment of the present invention;
FIG. 8 is an L/a variation graph according to a preferred embodiment of the present invention;
FIG. 9 is a graph of foundation pit displacement at different mid-vector ratios in accordance with a preferred embodiment of the present invention;
FIG. 10 is a layout of the intermediate section at different aspect ratios in accordance with a preferred embodiment of the present invention;
FIG. 11 is a diagram of a foundation pit layout of 30m by 105m size in accordance with a preferred embodiment of the present invention;
fig. 12 is a diagram of a foundation pit layout of 30m x 150m size according to a preferred embodiment of the present invention;
FIG. 13 is a functional block diagram of a planar layout device based on a pre-stressed fish-web steel support system according to an embodiment of the invention;
fig. 14 is a schematic hardware structure of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides a plane layout method based on a prestress fish belly type steel support system, which can be used for electronic equipment such as computers, mobile phones, tablet personal computers and the like. Fig. 1 is a flow chart of a plane layout method based on a prestress fish-web type steel support system, which aims to realize reliable control of foundation pit deformation, recycle and reuse of support materials, achieve the aims of green support and energy conservation and consumption reduction of foundation pit engineering, and solve the problem of overlarge foundation pit displacement at a corner brace. As shown in fig. 1, the process includes the steps of:
s11, acquiring foundation pit size and angle support data, and constructing angle support balance conditions according to the angle support data.
The foundation pit is square under the general condition, and when the included angle between the angle brace and the waist beam is not 45 degrees, the deformation of the two ends of the angle brace is inconsistent.
According to practical needs, the gusset balance condition is constructed by using gusset data, as shown in fig. 2, the support range of the gusset on the short side of the foundation pit is (m+a), the support range on the long side is (m+b), and such a problem occurs in some foundation pit dimensions: the support range of the angle brace on the long side of the foundation pit is different from the support range of the angle brace on the short side of the foundation pit, so that the soil pressure born by the two ends of the angle brace is different, but the forces at the two ends of the same angle brace in the balanced state are the same, and the foundation is that the integral lateral movement occurs at the angle brace of the prestress fish belly beam system. The force balance at the corner brace should be ensured as much as possible when the planar arrangement is performed. It should be noted that, in this embodiment, only the above-mentioned acquisition device and foundation pit data are taken as examples for explanation, and in practical application, the selection may be performed according to practical requirements, and this embodiment is not limited thereto.
S12, determining the opposite bracing arrangement parameters of the foundation pit by using the foundation pit size and the angle brace balance condition.
In the embodiment, the foundation pit plane is simplified, a square foundation pit is used as a layout foundation, the influence of the fish-bellied beam span on the foundation pit is simulated to determine the value of the fish-bellied beam span, and the opposite bracing arrangement parameters of the foundation pit are finally determined by utilizing the foundation pit size and the angle brace balance condition. In the following steps, details will be described, and this embodiment will not be described again.
S13, carrying out plane layout on the foundation pit through the opposite bracing arrangement parameters.
In the embodiment, the span and the sagittal ratio of the fish belly sill are calculated by means of the opposite bracing arrangement parameters according to the square size formed after the opposite bracing is divided, and the fish belly sill is rounded. For the case of an ultra-long middle section, the pair support is additionally arranged to separate the fish web beams, so that the deformation of the foundation pit can be ensured, and the concrete treatment is as follows. And finally, finishing plane layout.
According to the plane layout method based on the prestress fish web type steel support system, the problem that the plane layout displacement of the prestress fish web type steel support system is overlarge is solved, according to the principle that the horizontal displacement in the pit of the foundation pit plane is minimized by reasonable layout, finite element simulation and finite element analysis are carried out on the foundation pit plane through numerical software, the change condition of the horizontal displacement of the foundation pit is checked and compared, the rule that the horizontal displacement of the foundation pit changes along with the size of the fish web type steel support system is explored, the relation formula between the optimal specification of the prestress fish web type steel support system and the size of the foundation pit is obtained, and finally the reasonable size of the fish web type steel support system can be obtained according to the size of the foundation pit, so that the plane layout and the structural design are better carried out, and the purpose of better controlling the horizontal displacement of the foundation pit is achieved.
The method solves the key problems of balance of the stress of the angle brace, selection of span of the fish belly beam and high span geometry in plane layout of the prestress fish belly type steel support system, provides a set of rapid plane layout method of the prestress fish belly type steel support system, and is free of engineering experience for designers, can rapidly develop layout design of the flattened surface, maximally avoids unreasonable deformation of the foundation pit at the angle brace, is convenient for design and use of construction units, and facilitates popularization and application of the novel prestress fish belly type steel support system.
In another embodiment, there is also provided a plane layout method based on a prestressed fish-web steel support system, according to another flowchart of the plane layout method based on the prestressed fish-web steel support system of the embodiment of the present invention, the flowchart includes the following steps:
s21, acquiring foundation pit size and angle support data, and constructing angle support balance conditions according to the angle support data.
In this embodiment, the step S21 specifically further includes: the gusset data comprises the length of the gusset edge, the supporting range of the short edge and the supporting range of the long edge of the foundation pit,
s211, setting a corner support angle.
In this embodiment, the angle of the gusset is set, and the foundation pit is generally square, and when the angle between the gusset and the waist beam is not 45 degrees, the deformation phenomenon of the two ends of the gusset is inconsistent. From the viewpoint of ensuring the minimum deformation of the foundation pit, when the angle support is 45 degrees, the deformation of the whole foundation pit angle support is minimum; from the viewpoint of ensuring minimum deformation of the foundation pit, the deformation at the entire foundation pit gusset is minimum when the gusset is 45 degrees.
S212, determining balance conditions of two ends of the angle brace according to preset uniform load, angle of the angle brace, length of the edge of the angle brace, short-side support range and long-side support range.
Let the equipartition load of soil be q, the right angle side length of angle brace be m, consider symmetrical arrangement and the principle of convenient calculation, to propping splayed and propping the length of right angle side also be m, according to the supporting range, the balanced condition in angle brace both ends is:
（m+a1）*q=（m+b1）*q→a1=b1
wherein q is a preset uniform load, m is the length of the side of the angle brace, a1 is the short side supporting range, and b1 is the long side supporting range. I.e. lx=ly, as shown in fig. 2. The requirement for gusset balancing is therefore met by dividing the foundation pit arrangement into squares immediately adjacent the short sides.
S22, determining the opposite bracing arrangement parameters of the foundation pit by using the foundation pit size and the angle brace balance condition.
Referring to step S12 in detail, the description of this embodiment is omitted.
S23, carrying out plane layout on the foundation pit through the opposite bracing arrangement parameters. Referring to step S13 in detail, the description of this embodiment is omitted.
According to the plane layout method based on the prestress fish belly type steel support system, the problem that the plane layout displacement of the prestress fish belly type steel support system is overlarge is solved, according to the principle that the horizontal displacement in the pit of the foundation pit plane is minimized through reasonable layout, finite element simulation and finite element analysis are conducted on the foundation pit plane through numerical software, the change condition of the horizontal displacement of the foundation pit is checked and compared, the rule that the horizontal displacement of the foundation pit changes along with the size of the fish belly type steel support system is explored, the relation formula between the optimal specification of the prestress fish belly type steel support system and the size of the foundation pit is obtained, and finally the reasonable size of the fish belly type steel support system can be obtained according to the size of the foundation pit, so that plane layout and structural design are conducted well, and the purpose of controlling the horizontal displacement of the foundation pit is achieved well.
In another embodiment, a plane layout method based on a prestressed fish-web steel support system is further provided, and the plane layout method based on the prestressed fish-web steel support system according to the embodiment of the invention includes the following steps:
s31, acquiring foundation pit size and angle support data, and constructing angle support balance conditions according to the angle support data.
Referring to step S21 in detail, the present embodiment is not described in detail.
S32, determining the opposite bracing arrangement parameters of the foundation pit by using the foundation pit size and the angle brace balance condition.
In this embodiment, the step S32 specifically further includes: the dimensions of the foundation pit include the long side dimensions of the foundation pit and the short side dimensions of the foundation pit, wherein,
s321, calculating the aspect ratio of the foundation pit according to the long side size of the foundation pit and the short side size of the foundation pit.
In this embodiment, the aspect ratio of the foundation pit is calculated in each case. Considering special cases, for example, when the length-width ratio of the foundation pit is 2, a pair of supports can be arranged in the middle of the foundation pit, so that the foundation pit is arranged in two square parts, and a first middle section layout schematic diagram is shown in fig. 3; when the aspect ratio of the foundation pit is 3, two pairs of supports are arranged, so that the foundation pit is divided into three square parts, the stress balance of the angle braces is ensured, and the like.
However, when the aspect ratio cannot be rounded, the arrangement of the foundation pit plane is still further discussed. The principle of placement is first determined: in the long-strip foundation pit, according to the length-width ratio of the foundation pit, arranging two ends of the foundation pit into square parts as much as possible, and carrying out classified discussion on the arrangement of the middle part: when 2<b/a <3, two square parts are arranged at two ends of the foundation pit, and the length of the middle part is insufficient for arranging the fish belly beams (the length is about <21 m), the steel supports are arranged for longitudinal and transverse support, and the second middle section arrangement schematic diagram is shown in figure 4; when the length of the middle part is large enough (length is more than 21 m), a fish belly beam component is further arranged, and a third middle section layout schematic diagram is shown in fig. 5.
S322, constructing a layout relation formula of the size of the fish belly sill and the size of the foundation pit.
Specifically, the step S322 further includes:
(1) Analyzing and processing the size of the fish belly sill and the size of the foundation pit, and determining a change formula of the size of the fish belly sill and the size of the foundation pit; the formula is changed by the following formula: l=0.0044a2+0.4297a
Wherein, the dimension of the L-shaped fish web beam, a is the dimension of the foundation pit;
in practical application, the horizontal force acting on the waist beam is considered according to uniform load. It can be obtained that under the condition that the side length a of the foundation pit is unchanged, the span L of the fish-bellied beam can be changed by changing the position x of the angle brace, when x is increased, the load born by the angle brace part is increased, so that the maximum displacement of the angle brace part is increased, the maximum displacement of the fish-bellied beam part is reduced, when the displacement of the angle brace part and the angle brace part is reduced, the whole displacement reaches the minimum, and the condition of the minimum displacement is utilized to determine the span L of the fish-bellied beam.
Analysis of the simulation results shows that under the same foundation pit, the larger the size of the fish web girder is, the larger the maximum displacement in the interval is, and accordingly the maximum displacement of the angle support part is reduced, and when the displacement of the two parts is equal, the length of the fish web girder which enables the displacement of the foundation pit to be minimum is obtained. As shown in fig. 6, the maximum displacement of the web beam and the gusset portion of the foundation pit at different gusset right angle side lengths x is 30m by 30m, and it can be seen that the abscissa of the intersection point is about 6.4m, that is, the web beam length L is about 30-6.4 by 2=17.2 m.
Then, by adopting the same method, a series of fish web beam sizes minimizing the foundation pit displacement under the foundation pit size are obtained through finite element simulation and analysis, and as shown in fig. 7, l=a-2 x (m). It can be seen that as the pit size increases, x increases, but at a relatively low rate, so x/a decreases as the pit size increases, and correspondingly the L/a, i.e., the ratio of the length of the fish web beam to the length of the pit edge increases as the pit size increases. According to the obtained data, an L/a change chart shown in fig. 8 is arranged, L/a=0.0044a+ 0.4297 is obtained, and a relation formula of the size of the fish belly sill and the size of the foundation pit is obtained: l=0.0044a2+0.4297a.
(2) Acquiring a critical value of a prestressed fish web girder of a foundation pit according to a span type and a foundation pit size; in the embodiment, when the foundation pit is smaller in size, the span of the fish belly sill is smaller, the influence of the change of the sagittal comparison displacement is not great, and 1/6 of the simulation result can be recommended; and when the foundation pit size and the span of the fish web girder are larger, the influence of the sagittal ratio on the displacement of the foundation pit is increased, and the sagittal ratio is recommended to be 1/5. Therefore, the critical value of the pit size can be 38m.
(3) And correcting the change formula by utilizing the prestressed fish web girder according to the span type and the critical value of the foundation pit size, and determining the layout relation formula.
In practical application, the change formula is further modified. According to the technical regulations of prestressed fish-bellied foundation pit steel support, the prestressed fish-bellied beams can be divided into FS type, FA type, SS type and FA type fish-bellied beams with the sagittal ratio of 1/6-1/9, and SS type fish-bellied beams with the sagittal ratio of 1/4-1/7 according to the span. In the simulation of the previous step, the span of the fish belly beam is 17-29 m, and the span ratio of 0.2 is uniformly adopted, so that the foundation pit size a and the span L of the fish belly beam are kept unchanged, the span ratio of the fish belly beam is changed, the structure is analyzed, and the influence of the span ratio on the structural displacement is obtained, as shown in fig. 9.
Therefore, the small-size foundation pit with the sagittal-span ratio of 0.2 in the previous step is continuously corrected, the sagittal span is changed into 1/6, finite element simulation and analysis are carried out again, the formula is corrected, and finally, the layout relation formula is obtained:
wherein L is the size of the fish web girder, a is the size of the foundation pit, and a 0 Is a critical value for the pit size.
S33, carrying out plane layout on the foundation pit through the opposite bracing arrangement parameters.
Referring to step S23 in detail, the present embodiment is not described in detail.
According to the plane layout method based on the prestress fish belly type steel support system, the problem that the plane layout displacement of the prestress fish belly type steel support system is overlarge is solved, according to the principle that the horizontal displacement in the pit of the foundation pit plane is minimized through reasonable layout, finite element simulation and finite element analysis are conducted on the foundation pit plane through numerical software, the change condition of the horizontal displacement of the foundation pit is checked and compared, the rule that the horizontal displacement of the foundation pit changes along with the size of the fish belly type steel support system is explored, the relation formula between the optimal specification of the prestress fish belly type steel support system and the size of the foundation pit is obtained, and finally the reasonable size of the fish belly type steel support system can be obtained according to the size of the foundation pit, so that plane layout and structural design are conducted well, and the purpose of controlling the horizontal displacement of the foundation pit is achieved well.
In another embodiment, a plane layout method based on a prestressed fish-web steel support system is further provided, and the plane layout method based on the prestressed fish-web steel support system according to the embodiment of the invention includes the following steps:
s41, acquiring foundation pit size and angle support data, and constructing angle support balance conditions according to the angle support data.
Referring to step S31 in detail, the description of this embodiment is omitted.
S42, determining the opposite bracing arrangement parameters of the foundation pit by using the foundation pit size and the angle brace balance condition.
Referring to step S32 in detail, the present embodiment is not described in detail.
S43, carrying out plane layout on the foundation pit through the opposite bracing arrangement parameters.
Specifically, the step S43 further includes the steps of:
s431, dividing the foundation pit according to the aspect ratio of the foundation pit and the preset requirement, and determining a division result; in this embodiment, after calculating the aspect ratio of the foundation pit, the foundation pit is divided according to preset requirements as shown in fig. 10, and the division result is determined.
S432, calculating a segmentation result by using the foundation pit size and the layout relation formula to obtain the size of the fish belly sill. According to the square size formed after the split of the split support, the span and the sagittal-span ratio of the fish web girder are calculated by means of a layout relation formula, and are rounded. For the case of an ultra-long middle section, the pair support is additionally arranged to separate the fish web beams, so that the deformation of the foundation pit can be ensured, and the concrete treatment is as follows.
In practical application, the present application will be described in detail by the following examples:
taking a foundation pit with a size of 30m by 105m as an example, calculating b/a to be 3.5, firstly arranging two square parts at two ends of the foundation pit, wherein the length of the part of the fish web beam is determined by substituting the short side size a of the foundation pit into a formula, substituting a=30 into the formula to obtain L1=15m, then x1=7.5m, the length of the middle part of the foundation pit is 45m, substituting into the formula to obtain L2=28m, and then x2=8.5m, and arranging the fish web beam as shown in fig. 11.
Taking a foundation pit with the length of 30m x 150m as an example, two square parts are arranged at two ends of the foundation pit at present, the span of the fish-bellied beam is determined to be L1=15m according to a short side, a pair of supports is arranged at the middle part of the foundation pit, the foundation pit is divided into two parts with the length of 30m x 45m, the dimension of the fish-bellied beam is determined to be L2=28m according to a substitution formula of the length of a long side (45 m), and the arrangement is shown in fig. 12.
The present embodiment provides a planar layout device based on a pre-stressed fish-web steel support system, as used below, the term "module" may be a combination of software and/or hardware that performs a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
The invention discloses a plane layout device based on a prestress fish belly type steel support system, which is shown in fig. 13 and comprises:
the first processing module 01 is used for acquiring the foundation pit size and the angle support data and constructing angle support balance conditions according to the angle support data;
a second processing module 02, configured to determine a diagonal bracing arrangement parameter of the foundation pit by using the foundation pit size and the gusset balance condition;
and the third processing module 03 is used for carrying out plane layout on the foundation pit through the pair support arrangement parameters.
According to the plane layout device based on the prestress fish belly type steel support system, the problem that the plane layout displacement of the prestress fish belly type steel support system is overlarge is solved, according to the principle that the horizontal displacement in the pit of the foundation pit plane is minimized by reasonable layout, finite element simulation and finite element analysis are carried out on the foundation pit plane through numerical software, the change condition of the horizontal displacement of the foundation pit is checked and compared, the rule that the horizontal displacement of the foundation pit changes along with the size of the fish belly type steel support system is explored, the relation formula between the optimal specification of the prestress fish belly type steel support system and the size of the foundation pit is obtained, and finally the reasonable size of the fish belly type steel support system can be obtained according to the size of the foundation pit, so that plane layout and structural design are better carried out, and the purpose of controlling the horizontal displacement of the foundation pit is achieved better.
An embodiment of the present invention further provides an electronic device, referring to fig. 14, fig. 14 is a schematic structural diagram of an electronic device provided in an alternative embodiment of the present invention, and as shown in fig. 14, the electronic device may include: at least one processor 601, such as a CPU (Central Processing Unit ), at least one communication interface 603, a memory 604, at least one communication bus 602. Wherein the communication bus 602 is used to enable connected communications between these components. The communication interface 603 may include a Display screen (Display), a Keyboard (Keyboard), and the selectable communication interface 603 may further include a standard wired interface, and a wireless interface. The memory 604 may be a high-speed RAM memory (Random Access Memory, volatile random access memory) or a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 604 may also optionally be at least one storage device located remotely from the processor 601. Where the processor 601 may store an application program in the memory 604 in the apparatus described in connection with fig. 14, and the processor 601 invokes the program code stored in the memory 604 for performing any of the method steps described above.
The communication bus 602 may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus, among others. The communication bus 602 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 14, but not only one bus or one type of bus.
Wherein the memory 604 may comprise volatile memory (english) such as random-access memory (RAM); the memory may also include a nonvolatile memory (english: non-volatile memory), such as a flash memory (english: flash memory), a hard disk (english: hard disk drive, abbreviated as HDD) or a solid state disk (english: solid-state drive, abbreviated as SSD); memory 604 may also include a combination of the types of memory described above.
The processor 601 may be a central processor (English: central processing unit, abbreviated: CPU), a network processor (English: network processor, abbreviated: NP) or a combination of CPU and NP.
The processor 601 may further comprise a hardware chip, among other things. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof (English: programmable logic device). The PLD may be a complex programmable logic device (English: complex programmable logic device, abbreviated: CPLD), a field programmable gate array (English: field-programmable gate array, abbreviated: FPGA), a general-purpose array logic (English: generic array logic, abbreviated: GAL), or any combination thereof.
Optionally, the memory 604 is also used for storing program instructions. The processor 601 may invoke program instructions to implement a planar layout method based on a pre-stressed fish-web steel support system as shown in the embodiments of the present application.
The embodiment of the invention also provides a non-transitory computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the plane layout method based on the prestress fish-web type steel support system in any method embodiment. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (7)
1. A plane layout method based on a prestress fish belly type steel support system is characterized by comprising the following steps:
acquiring foundation pit size and angle support data, and constructing angle support balance conditions according to the angle support data;
said constructing a gusset balance condition from said gusset data, comprising: the gusset data comprises a gusset edge length, a short edge support range and a long edge support range of the foundation pit,
setting a corner support angle;
determining balance conditions at two ends of the angle brace according to preset uniform load, angle of the angle brace, length of the edge of the angle brace, short side supporting range and long side supporting range;
the balance condition at both ends of the gusset is expressed by the following formula:
（m+a1）*q=（m+b1）*q→a1=b1
wherein q is the preset uniform load, m is the length of the corner support edge, a1 is the short side supporting range, and b1 is the long side supporting range;
determining a bracing arrangement parameter of the foundation pit by utilizing the foundation pit size and the angle brace balance condition;
the determining the bracing arrangement parameters of the foundation pit by using the foundation pit size and the angle brace balance condition comprises the following steps: the foundation pit size comprises a long side size of the foundation pit and a short side size of the foundation pit, wherein,
calculating the aspect ratio of the foundation pit according to the long side size of the foundation pit and the short side size of the foundation pit;
constructing a layout relation formula of the size of the fish belly sill and the size of the foundation pit;
determining the aspect ratio of the foundation pit and the layout relation formula as a diagonal bracing arrangement parameter;
and carrying out plane layout on the foundation pit through the opposite bracing arrangement parameters.
2. The method of claim 1, wherein constructing the layout relation formula of the dimensions of the fish belly sill and the dimensions of the foundation pit comprises:
analyzing and processing the size of the fish belly sill and the size of the foundation pit, and determining a change formula of the size of the fish belly sill and the size of the foundation pit;
the change formula is described by the following formula:
L=0.0044a 2 +0.4297a
the dimension of the fish web beam is L, and a is the dimension of the foundation pit;
acquiring a critical value of the prestressed fish-web girder of the foundation pit according to the span type and the size of the foundation pit;
and correcting the change formula by using the prestressed fish web girder according to the span type and the critical value of the foundation pit size, and determining the layout relation formula.
3. The method of claim 1, wherein the layout method is further optimized taking into account the influence of the sagittal ratio, the layout relationship formula being expressed by the following formula:
wherein L is the size of the fish web girder, a is the size of the foundation pit, and a 0 Is the critical value of the foundation pit size.
4. A method according to claim 3, wherein said planarly laying said foundation pit by said bracing arrangement parameters comprises:
dividing the foundation pit according to the aspect ratio of the foundation pit and preset requirements, and determining a division result;
and calculating the segmentation result by using the foundation pit size and the layout relation formula to obtain the size of the fish belly sill.
5. A planar layout device based on a prestressed fish-web type steel support system, which is characterized by comprising:
the first processing module is used for acquiring the foundation pit size and the angle support data and constructing angle support balance conditions according to the angle support data; said constructing a gusset balance condition from said gusset data, comprising: the angle support data comprise the length of the angle support edge, the short side support range and the long side support range of the foundation pit, and angle support angles are set; determining balance conditions at two ends of the angle brace according to preset uniform load, angle of the angle brace, length of the edge of the angle brace, short side supporting range and long side supporting range; the balance condition at both ends of the gusset is expressed by the following formula:
（m+a1）*q=（m+b1）*q→a1=b1
wherein q is the preset uniform load, m is the length of the corner support edge, a1 is the short side supporting range, and b1 is the long side supporting range;
the second processing module is used for determining the opposite bracing arrangement parameters of the foundation pit by utilizing the foundation pit size and the angle brace balance condition; the determining the bracing arrangement parameters of the foundation pit by using the foundation pit size and the angle brace balance condition comprises the following steps: the foundation pit size comprises a long side size of the foundation pit and a short side size of the foundation pit, wherein the aspect ratio of the foundation pit is calculated according to the long side size of the foundation pit and the short side size of the foundation pit; constructing a layout relation formula of the size of the fish belly sill and the size of the foundation pit; determining the aspect ratio of the foundation pit and the layout relation formula as a diagonal bracing arrangement parameter;
and the third processing module is used for carrying out plane layout on the foundation pit through the opposite bracing arrangement parameters.
6. An electronic device, comprising:
the device comprises a memory and a processor, wherein the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions, so that the plane layout method based on the prestress fish-web type steel support system is executed by the processor.
7. A computer readable storage medium, characterized in that it stores computer instructions for causing a computer to perform the method for laying out a plane based on a pre-stressed fish-web steel support system according to any one of claims 1-4.
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