CN111172998A - Standardized and extensible fabricated foundation pit inner support system - Google Patents
Standardized and extensible fabricated foundation pit inner support system Download PDFInfo
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- CN111172998A CN111172998A CN202010086473.3A CN202010086473A CN111172998A CN 111172998 A CN111172998 A CN 111172998A CN 202010086473 A CN202010086473 A CN 202010086473A CN 111172998 A CN111172998 A CN 111172998A
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 119
- 239000010959 steel Substances 0.000 claims abstract description 119
- 238000009412 basement excavation Methods 0.000 claims abstract description 10
- 239000004567 concrete Substances 0.000 claims description 17
- 230000003014 reinforcing effect Effects 0.000 claims description 14
- 238000010276 construction Methods 0.000 abstract description 20
- 238000012545 processing Methods 0.000 abstract description 13
- 238000004064 recycling Methods 0.000 abstract 1
- 239000002689 soil Substances 0.000 abstract 1
- 230000000452 restraining effect Effects 0.000 description 17
- 239000011159 matrix material Substances 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000003365 glass fiber Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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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Abstract
The invention provides a standardized and extensible fabricated foundation pit inner support system, which comprises a plurality of support columns; the supporting column consists of one or a plurality of cross-shaped column sections; the cross-shaped column section comprises: the device comprises a pipe body, T-shaped steel, an upper end plate and a lower end plate; the four T-shaped steels are uniformly distributed on the circumferential direction of the pipe body in a cross shape; the T-shaped steel comprises a web plate and a flange; two ends of the web plate are respectively fixedly connected with the flange and the outer wall of the pipe body; a plurality of connecting holes are formed in the flange; the assembled foundation pit inner support system has the advantages of high standardization degree, simplicity and convenience in processing, expandability, strong adaptability, detachable recycling, good stress performance, high strength, high rigidity, steel consumption saving, high support rigidity, large vertical support interval, high soil excavation efficiency, high construction speed and the like, and has a good application prospect in a foundation pit support structure.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a standardized and extensible fabricated foundation pit inner support system.
Background
Along with the development of the urbanization process in China, the development scale of urban underground space is larger and larger, for example, in the Shenzhen front sea area, the development area of the underground space reaches 630 ten thousand square meters, and the excavation depth of a foundation pit reaches 32.5 meters. As the foundation pit engineering has the characteristics of larger and larger excavation scale, deeper and deeper excavation depth, complex and sensitive surrounding environment, complex and complicated underground pipelines and the like, the consequences caused by excessive deformation and damage of the foundation pit are more and more serious, the requirement on the safe construction of the foundation pit is higher and higher, and the foundation pit engineering construction supporting technology faces huge challenges.
The foundation pit engineering is one of important research directions in geotechnical engineering and one of the difficulties in engineering. Because the scale, geological and hydrological conditions and surrounding environment of each project are different, each foundation pit project is a complex system project. In the design of foundation pit engineering, the inner support system is the main content of calculation and analysis of engineers. In China, the common foundation pit supports are reinforced concrete supports (beams or slabs) and section steel supports, and are arranged according to the plane shape of the foundation pit. The concrete support needs a large amount of wet operation on an engineering site, and has the problems of long construction period, difficult quality guarantee, environmental pollution, resource waste, difficult dismantling and the like. The dense steel support has the problems of serious material waste, low excavation efficiency and the like, and can not meet the engineering and social requirements of green and efficient construction in a new period.
The novel reusable and extensible assembled supporting structure is developed, construction conditions are improved, the excavation efficiency is improved, the construction period of earthwork excavation is reduced, the mounting and dismounting period of the supporting structure is reduced, industrialization and assembly of a foundation pit supporting technology are achieved, and the method has important significance for sustainable development and green construction of foundation pit engineering.
Disclosure of Invention
The invention aims to provide a standardized and extensible assembly type foundation pit inner support system to solve the technical problems that a concrete foundation pit support is inconvenient to disassemble, the construction period is long, the expansibility of a circular steel pipe support is poor, the circular steel pipe support is inconvenient to recycle, the bearing capacity of an H-shaped steel support is low and the like in the prior art.
In order to solve the technical problem, the invention provides a standardized and extensible fabricated foundation pit inner support system, which comprises a plurality of support columns; the adjacent support columns are directly connected or connected through an intermediate connecting piece;
the supporting column consists of one or a plurality of cross-shaped column sections;
the cross-shaped column section comprises: the device comprises a pipe body, T-shaped steel, an upper end plate and a lower end plate;
the four T-shaped steels are uniformly distributed on the circumferential direction of the pipe body in a cross shape;
the T-shaped steel comprises a web plate and a flange; two ends of the web plate are respectively fixedly connected with the flange and the outer wall of the pipe body; a plurality of connecting holes are formed in the flange;
the upper end plate and the lower end plate are respectively arranged at the upper end and the lower end of the cross-shaped column joint and are fixedly connected with the pipe body and the end part of the T-shaped steel; the upper end plate and the lower end plate are provided with bolt holes for fixedly connecting two vertically adjacent cross-shaped column joints;
in two vertically adjacent cross-shaped column joints, a lower end plate at the bottom of an upper cross-shaped column joint positioned above is fixedly connected with an upper end plate of a lower cross-shaped column joint positioned below by using bolts after the lower end plate is attached to the upper end plate.
Wherein, in this application, cross column festival is standardized, expandable steel support unit to thereby can increase and decrease the height of every support column and satisfy the engineering needs according to the degree of depth of foundation ditch. And in the horizontal projection plane, matrix type supporting column combinations can be arranged side by side according to the size of the foundation pit operation surface, geological conditions, supporting strength and rigidity requirements, and a combined section support is formed.
From this, support system in this application assembled foundation ditch has that the standardization level is high, processing is simple and convenient, extensible, strong adaptability, can dismantle reuse, atress performance is good, intensity is high, rigidity is big, the steel consumption is economized, support rigidity is big, vertical braces interval is big, and it is efficient to dig, construction speed a great deal of advantage such as fast, has good application prospect in foundation ditch supporting construction.
The connecting cover plate is provided with a bolt hole; the connecting cover plate covers the joint of the upper cross-shaped column joint and the lower cross-shaped column joint and is fixedly connected with the lower T-shaped steel flange of the lower combined column joint and the upper T-shaped steel flange of the upper combined column joint through bolts.
Further, concrete is poured into the pipe body, and the concrete is selected from concrete with the strength of above C50.
Furthermore, concrete pouring holes are formed in the upper end plate and the lower end plate at corresponding positions of the inner hole of the pipe body; in the horizontal projection plane and the inner hole coverage range of the tube body, exhaust holes are further formed in the upper end plate and the lower end plate.
Preferably, a plurality of the exhaust holes are arranged along the circumferential direction of the concrete pouring hole at intervals. The diameter of the vent hole is not less than 20 mm.
Further, the T-shaped steel is split H-shaped steel which is formed by splitting the hot-rolled or high-frequency welded H-shaped steel along a web folding line; the pipe body is a round steel pipe or a square steel pipe.
Furthermore, a plurality of openings are arranged on a web plate of the T-shaped steel at intervals along the length direction of the cross-shaped column joint to serve as mounting hand holes for mounting internal bolts when the combined cross-section support is formed by splicing.
Furthermore, stiffening steel plates are arranged on flanges or webs of the cross-shaped column joints at intervals along the length direction of the cross-shaped column joints and are used for improving the integrity of the cross-shaped column joint sections.
Furthermore, the support columns are arranged in rows, columns, rectangles or matrix type.
Furthermore, two T-shaped steel flanges on two adjacent support columns are attached to each other and directly and fixedly connected through bolts;
or, two adjacent support columns are arranged at intervals, and two T-shaped steel flanges on the two support columns are connected through an intermediate connecting piece. Generally, the middle connecting piece is fixedly connected with the flange of the T-shaped steel on the outermost side.
Furthermore, two adjacent support columns respectively comprise an outer side flange, and the two outer side flanges are positioned in the same vertical plane; two ends of the middle connecting piece are respectively fixedly connected with the two outer side flanges; the middle connecting piece is a connecting batten or a reinforcing cover plate.
Furthermore, the reinforcing cover plate comprises a steel plate and angle steels, wherein the angle steels are arranged at intervals along the width direction of the steel plate and are used for improving the out-of-plane rigidity of the steel plate and preventing the steel plate from locally buckling along the out-of-plane direction; two adjacent support columns respectively comprise an outer side flange, and the two outer side flanges are positioned in the same vertical plane; the two ends of the steel plate are respectively fixedly connected with the two outer side flanges.
Furthermore, the connecting batten strips and the horizontal plane form an angle of 45 degrees, and the adjacent connecting batten strips form an included angle of 90 degrees with each other; the connecting batten is a steel plate or an angle steel.
The support columns are directly or indirectly fixedly connected to form integral work together, so that the strength and rigidity of the combined section support system can be improved.
Further, the intermediate connecting piece is a constraint support piece; two ends of the constraint support are respectively and fixedly connected with the outer side flanges of the two adjacent support columns;
the restraint support comprises an outer restraint sleeve, an inner core, a restraint ring and a restraint rod which are all arranged in the outer restraint sleeve;
the restraint rod and the inner core are arranged along the length direction of the outer restraint sleeve, and the restraint ring is fixed with the outer restraint sleeve and sleeved outside the inner core and the restraint rod so as to fix the inner core and the restraint rod.
Further, the inner core is in a strip plate shape; the two sides of the inner core are provided with the restraint rods; or, the inner core is a long strip with a cross-shaped section, and the four cross-shaped intervals are provided with the restraint rods.
Further, the restraint ring comprises a plurality of annular restraint reinforcing steel bars sleeved outside the inner core and the restraint rods; and the annular constraint steel bars are sequentially arranged at intervals along the length direction of the constraint rod.
Further, the restraint ring is an annular restraint reinforcing steel bar spirally wound outside the inner core. Wherein, the annular restraint reinforcing bar is preferably smooth round reinforcing bar.
Further, the restraint rods are steel rods; and the steel bar is welded and fixed with the plain round steel bar.
Further, an anti-friction layer is arranged between the restraint rod and the inner core so as to reduce the frictional resistance between the restraint rod and the inner core.
Furthermore, the outer constraint sleeve is made of mortar, and a reinforcing structure is arranged in the outer constraint sleeve; the reinforcing structure is a steel wire mesh or a glass fiber mesh; the steel wire mesh or the glass fiber mesh is arranged along the circumferential direction of the outer constraint sleeve.
Furthermore, the two ends of the inner core are respectively provided with a connecting end extending out of the outer restraining sleeve; the width of the connecting end is larger than the width of the inner core in the outer constraint sleeve (the middle width of the inner core); the connecting end is provided with a mounting hole. The constraint support piece is connected with the steel beam and the column body through the mounting hole in the connecting end.
The buckling restrained brace, the restraint rod and the restraint ring restrain buckling of the inner core and limit local buckling of the inner core, so that the performance of the core plate can be fully exerted, meanwhile, only the restraint ring is sleeved outside the inner core and the restraint rod to fix during processing, the requirement is low, and special factory processing is not needed during the operation, so that the processing is simple and convenient, and the operation is easy. The restraint rods are steel rods, the inner cores are steel cores, the restraint rings are made of round optical steel bars which are common materials, and therefore cost is low and economical efficiency is good. The outer constraint sleeve is made of mortar, so that the buckling restrained brace is prevented from being corroded, and the outer constraint sleeve is free of maintenance in the service life.
By adopting the technical scheme, the invention has the following beneficial effects:
the standardized and extensible fabricated foundation pit inner support system provided by the invention has the following performance advantages:
1) high standardization degree, simple processing, low production cost and automatic production. This patent is standardized, expandable assembled foundation ditch inner support system adopts T shaped steel and the circular steel tube welding of small cross section cold-formed that hot rolling H shaped steel or high frequency welding H shaped steel subdivision formed to form, and processing is simple, low in production cost, and standardization level is high.
2) The combined support is expandable, strong in adaptability, can be expanded horizontally, vertically or bidirectionally, can be provided with a reinforced cover plate, and can flexibly adjust the section strength and rigidity of the combined support.
3) The detachable and reusable node connecting structure has the advantages of convenience in node connection and reliable performance. This patent standardized, extensible assembled foundation ditch inner support system passes through bolted connection, and the nodal connection is convenient, the dependable performance, and it is convenient to dismantle, repeatedly usable.
4) Good stress performance, high strength, large rigidity and less steel consumption. The circular steel tube concrete is located near the neutralizing shaft and mainly bears axial pressure, the advantages of high bearing capacity and high rigidity of the circular steel tube concrete under pressure can be fully exerted, the subdivision H-shaped steel is mainly bent far away from the neutralizing shaft, and the advantages of the two sectional materials are fully exerted. The round steel pipe concrete has strong constraint effect and can further save the steel consumption by combining with the high-strength concrete.
5) The support rigidity is big, and vertical support interval is big, and it is efficient to dig, and the construction speed is fast. The large space between the supports can be formed, the construction condition is improved, the excavation efficiency is greatly improved, the construction period of earthwork excavation is reduced, the installation and dismantling period of the support structure is reduced, and the deformation of the foundation pit can be effectively controlled through the support axial force servo system.
To sum up, this patent of standardized, extensible assembled foundation ditch inner support system that this patent provided has that the standardization level is high, processing is simple and convenient, extensible, strong adaptability, can dismantle reuse, the atress performance is good, intensity is high, rigidity is big, with the steel volume economize, support rigidity is big, vertical support interval is big, dig a great deal of advantage such as efficient, construction speed is fast, has good application prospect in the foundation ditch supporting construction.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of a support pillar structure provided in embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of the cruciform strut shown in FIG. 1;
FIG. 3 is a cross-sectional view CC of FIG. 1;
FIG. 4 is a view showing a connection relationship between a pipe body and T-section steel;
FIG. 5 is a view showing the layout of stiffening steel plates;
FIG. 6 is a schematic view showing support columns arranged in rows in embodiment 1 of the present invention;
FIG. 7 is a schematic view showing arrangement of support columns in rows in embodiment 1 of the present invention;
FIG. 8 is a schematic view showing a rectangular arrangement of support columns in embodiment 1 of the present invention;
FIG. 9 is a schematic diagram of the arrangement of the supporting pillars in a matrix form in embodiment 1 of the present invention;
fig. 10 is a schematic view of connection between support columns by lacing bars in embodiment 1 of the present invention;
FIG. 11 is a top view of FIG. 10;
FIG. 12 is a schematic view showing the connection between the support columns by the reinforcing cover plate in example 1 of the present invention; FIG. 13 is a schematic view showing the layout of the constraining supports in example 2;
FIG. 14 is a cross-sectional view AA in FIG. 13;
FIG. 15 is a side view of a cruciform inner core;
fig. 16 is a cross-sectional view of FF in fig. 14.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be further explained with reference to specific embodiments.
Example 1
As shown in fig. 1-2, the present embodiment provides a standardized and expandable fabricated foundation pit support system, which includes a plurality of support columns 100; the adjacent supporting columns 100 are directly connected or connected through an intermediate connecting piece;
the support column 100 is composed of one or several cross-shaped column joints 110;
the cross-shaped joint 110 includes: a pipe body 120, a T-bar 130, an upper end plate 150, and a lower end plate 140;
the four T-shaped steels 130 are uniformly distributed on the circumferential direction of the pipe body 120 in a cross shape;
the T-section 130 includes a web 131 and a flange 132; two ends of the web 131 are respectively fixedly connected with the flange 132 and the outer wall of the tube body 120; the flange 132 is provided with a plurality of coupling holes.
The upper end plate 150 and the lower end plate 140 are respectively arranged at the upper end and the lower end of the cross-shaped column joint 110 and are fixedly connected with the end parts of the pipe body 120 and the T-shaped steel 130; the upper end plate 150 and the lower end plate 140 are provided with bolt holes for fixedly connecting two vertically adjacent cross-shaped column joints 110;
in two vertically adjacent cross-shaped column joints 110, a lower end plate 140 at the bottom of an upper cross-shaped column joint 110a located above and an upper end plate 150 of a lower cross-shaped column joint 110b located below are attached to each other and then fixedly connected by bolts.
Wherein, in this application, cross column festival 110 is standardized, expandable steel support unit to thereby can increase and decrease the height of every support column 100 and satisfy the engineering needs according to the degree of depth of foundation ditch. And in the horizontal projection plane, the matrix type support columns 100 can be arranged side by side according to the size of the foundation pit operation surface, geological conditions, support strength and rigidity requirements, namely a combined section support is formed.
From this, support system in this application assembled foundation ditch has that the standardization level is high, processing is simple and convenient, extensible, strong adaptability, can dismantle reuse, atress performance is good, intensity is high, rigidity is big, the steel consumption is economized, support rigidity is big, vertical braces interval is big, and it is efficient to dig, construction speed a great deal of advantage such as fast, has good application prospect in foundation ditch supporting construction.
The embodiment also comprises a connecting cover plate 160, wherein a bolt hole is formed in the connecting cover plate; the connecting cover plate covers the joint of the upper cross-shaped column joint 110 and the lower cross-shaped column joint 110 and is fixedly connected with the flange 132 of the lower T-shaped steel 130 of the lower combined column joint and the flange 132 of the upper T-shaped steel 130 of the upper combined column joint through bolts. Concrete 170 is poured into the pipe body 120, and the concrete is selected from concrete with the strength of above C50.
Wherein, the upper end plate 150 and the lower end plate 140 are preferably provided with concrete pouring holes (not shown) at corresponding positions of the inner holes of the tube body 120; the upper end plate 150 and the lower end plate 140 are also provided with air vents (not shown) in the horizontal projection plane and within the coverage of the inner bore of the tube body 120. Preferably, the plurality of exhaust holes are arranged along the circumferential direction of the concrete pouring hole at intervals. The diameter of the vent hole is not less than 20 mm.
The T-shaped steel 130 is split H-shaped steel which is formed by splitting the H-shaped steel along a folding line of a web 131 through hot rolling or high-frequency welding; the pipe body 120 is a circular steel pipe or a square steel pipe. The web 131 of the T-section 130 is provided with a plurality of openings 133 (e.g., trapezoidal notches) spaced along the length of the cross joint 110 to serve as mounting hand holes for mounting internal bolts when the cross joint supports are formed by splicing.
Referring to fig. 5, stiffening steel plates 180 are provided on the flanges 132 or the webs 131 of the cross joint 110 at intervals in the length direction of the cross joint 110, for improving the integrity of the cross section of the cross joint 110.
The number and the arrangement form of the support columns are arranged according to the specific support requirements of the foundation pit. As shown in fig. 6, a plurality of supporting columns 100 are arranged in rows (transversely), and flanges 132 of two T-shaped steels 130 on two adjacent supporting columns 100 are abutted and directly fixed and connected by bolts; alternatively, as shown in fig. 7, a plurality of supporting columns 100 are arranged in a row (longitudinally), and two flanges 132 of the T-section steel 130 on two adjacent supporting columns 100 are abutted and directly fixed and connected by bolts. As shown in fig. 8, a plurality of support columns 100 are connected end to end in a rectangular (square) shape, and flanges 132 of two T-shaped steels 130 on two adjacent support columns 100 are attached and directly fixed by bolts. As shown in fig. 9, a plurality of support columns 100 are regularly arranged in a matrix manner, and two flanges 132 of the T-section steel 130 on two adjacent support columns 100 are abutted and directly and fixedly connected by bolts.
As shown in fig. 10, two adjacent support columns 100 can also be arranged at intervals, for example, the support columns are arranged in a matrix, and the support columns in two adjacent columns or rows are arranged at intervals. The flanges 132 of the two T-section steels 130 on the two support columns 100 arranged at intervals are connected through an intermediate connecting piece. Typically, the intermediate connecting member is fixedly connected to the flange 132 of the outermost T-section 130. Specifically, two adjacent support columns 100 respectively include an outer flange 132a, and the two outer flanges 132a are located in the same vertical plane; two ends of the middle connecting piece are respectively fixedly connected with the two outer side flanges 132 a; wherein, the middle connecting piece is a connecting lacing bar 210. As shown in fig. 11, the connecting batten 210 is arranged at an angle of 45 degrees with the horizontal plane, and two adjacent connecting battens form an included angle of 90 degrees; and the connecting batten is a steel plate or an angle steel.
As shown in fig. 12, the intermediate connecting member is a reinforcing cover plate 220, which includes a steel plate 221 and angle steels 222, the angle steels are arranged at intervals along the width direction of the steel plate, and are used for improving the out-of-plane rigidity of the steel plate and preventing the steel plate from locally buckling along the out-of-plane direction; two adjacent support columns 100 respectively comprise an outer side flange 132a, and the two outer side flanges 132a are positioned in the same vertical plane; the two ends 221 of the steel plate are fixedly connected with the two outer flanges 132 respectively.
The plurality of supporting columns 100 are directly or indirectly fixedly connected to form an integral joint work, so that the strength and the rigidity of the combined section supporting system can be improved.
This patent that this patent provided supports system in standardized, extensible assembled foundation ditch has that the standardization level is high, processing is simple and convenient, extensible, strong adaptability, can dismantle reuse, atress performance is good, intensity is high, rigidity is big, economize with the steel volume, support rigidity is big, vertical support interval is big, and it is efficient to dig, and construction speed is a great deal of advantages such as fast has good application prospect in the foundation ditch supporting construction.
Example 2
This embodiment is substantially the same as embodiment 1 except that:
the middle connecting member is a constraint support member, and as shown in fig. 13, two ends of the constraint support member 60 are respectively and fixedly connected with the outer side flanges of two adjacent supporting columns 100.
As shown in FIG. 14, the constraining support 60 comprises an outer constraining sheath 61, and an inner core 62, a constraining ring 63, and a constraining rod 64 all disposed within the outer constraining sheath.
The restraining rod 64 and the inner core 62 are both arranged along the length direction of the outer restraining sleeve, and the restraining ring 63 is fixed with the outer restraining sleeve and sleeved outside the inner core 62 and the restraining rod 64 so as to fix the inner core 62 and the restraining rod 64.
As shown in fig. 14, the core 62 has a long strip plate shape; both sides of the inner core 62 are provided with restraining rods 64; alternatively, as shown in fig. 15, the inner core 62 is a long strip with a cross-shaped cross section, and the four cross-shaped intervals are provided with the restraint rods 64.
Wherein, the restraint ring 63 comprises a plurality of annular restraint steel bars sleeved outside the inner core 62 and the restraint rods 64; the plurality of annular restraining bars are sequentially arranged at intervals along the length direction of the restraining bar 64. In addition, the restraining ring 63 may also be an annular restraining bar that is helically wound around the inner core 62. Wherein, annular restraint reinforcing bar is preferred plain round reinforcing bar. The restraining bar 64 is preferably a steel bar; and the steel bar is welded and fixed with the plain round steel bar. An anti-friction layer is disposed between the restraining bar 64 and the inner core 62 to reduce the frictional resistance between the restraining bar 64 and the inner core 62.
As shown in fig. 16, the outer restraining sleeve 61 includes a mortar layer 61a, and a reinforcing structure is provided in the mortar layer 61 a; the reinforcing structure is a steel wire mesh 61b (or glass fiber net); the steel wire mesh is arranged along the circumferential direction of the outer constraint casing.
As shown in fig. 13, both ends of the inner core 62 are respectively provided with a connection end 65 extending out of the outer restraining sleeve; the width of the connecting end is greater than the width of the inner core 62 of the outer constraining sheath (the middle width of the inner core 62); the connecting end is provided with a mounting hole. The constraint support piece is connected with the steel beam and the column body through the mounting hole in the connecting end respectively.
The buckling restrained brace, the restraint rod 64 and the restraint ring 63 restrain the buckling of the inner core 62 and limit the local buckling of the inner core 62, so that the performance of the core plate can be fully exerted, meanwhile, the restraint ring 63 only needs to be sleeved outside the inner core 62 and the restraint rod 64 for fixing during processing, the requirement is low, and the operation does not need special factory processing, so that the processing is simple and convenient, and the operation is easy. The restraint rods 64 are steel rods, the inner core 62 is steel core, the restraint rings 63 are made of smooth steel bars which are common materials, and therefore cost is low and economical efficiency is good. The outer constraint sleeve is made of mortar, so that the buckling restrained brace is prevented from being corroded, and the outer constraint sleeve is free of maintenance in the service life.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A standardized and expandable fabricated foundation pit inner support system is characterized by comprising a plurality of support columns; the adjacent support columns are directly connected or connected through an intermediate connecting piece;
the supporting column consists of one or a plurality of cross-shaped column sections;
the cross-shaped column section comprises: the device comprises a pipe body, T-shaped steel, an upper end plate and a lower end plate;
the four T-shaped steels are uniformly distributed on the circumferential direction of the pipe body in a cross shape;
the T-shaped steel comprises a web plate and a flange; two ends of the web plate are respectively fixedly connected with the flange and the outer wall of the pipe body; a plurality of connecting holes are formed in the flange;
the upper end plate and the lower end plate are respectively arranged at the upper end and the lower end of the cross-shaped column joint and are fixedly connected with the pipe body and the end part of the T-shaped steel; the upper end plate and the lower end plate are provided with bolt holes for fixedly connecting two vertically adjacent cross-shaped column joints;
in two vertically adjacent cross-shaped column joints, a lower end plate at the bottom of an upper cross-shaped column joint positioned above is fixedly connected with an upper end plate of a lower cross-shaped column joint positioned below by using bolts after the lower end plate is attached to the upper end plate.
2. The fabricated foundation pit support system of claim 1, further comprising a connection cover plate, wherein the connection cover plate is provided with bolt holes; the connecting cover plate covers the joint of the upper cross-shaped column joint and the lower cross-shaped column joint and is fixedly connected with the lower T-shaped steel flange of the lower combined column joint and the upper T-shaped steel flange of the upper combined column joint through bolts.
3. The fabricated foundation pit support system of claim 1, wherein concrete is poured into the tube.
4. The fabricated foundation pit support system of claim 1, wherein the upper end plate and the lower end plate are provided with concrete pouring holes at corresponding positions of the inner hole of the pipe body; in the horizontal projection plane and the inner hole coverage range of the tube body, exhaust holes are further formed in the upper end plate and the lower end plate.
5. The fabricated foundation pit inner support system according to claim 1, wherein the T-shaped steel is split H-shaped steel, and the split H-shaped steel is formed by splitting hot-rolled or high-frequency welded H-shaped steel along a web folding line; the pipe body is a round steel pipe or a square steel pipe;
and a plurality of openings are formed in the web plate of the T-shaped steel at intervals along the length direction of the cross-shaped column joint.
6. The fabricated foundation pit internal support system according to claim 1, wherein stiffening steel plates are arranged on the flanges or webs of the cross-shaped column joints at intervals along the length direction of the cross-shaped column joints, and are used for improving the integrity of the cross-shaped column joints.
7. The fabricated excavation internal support system of claim 1, wherein the plurality of support columns are arranged in rows, columns, rectangles, or matrices.
8. The fabricated foundation pit inner support system as claimed in claim 1, wherein two T-shaped steel flanges on two adjacent support columns are abutted and directly and fixedly connected by bolts;
or, two adjacent support columns are arranged at intervals, and two T-shaped steel flanges on the two support columns are connected through an intermediate connecting piece.
9. The fabricated foundation pit support system of claim 1, wherein each of two adjacent support columns includes an outer flange, and the two outer flanges are located in a same vertical plane; two ends of the middle connecting piece are respectively fixedly connected with the two outer side flanges; the middle connecting piece is a connecting batten or a reinforcing cover plate.
10. The fabricated foundation pit support system of claim 9, wherein the reinforcing cover plate comprises steel plates and angle steels, the angle steels are arranged at intervals along the width direction of the steel plates and are used for improving the out-of-plane rigidity of the steel plates and preventing the steel plates from partially buckling along the out-of-plane direction; two adjacent support columns respectively comprise an outer side flange, and the two outer side flanges are positioned in the same vertical plane; the two ends of the steel plate are respectively fixedly connected with the two outer side flanges.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010086473.3A CN111172998A (en) | 2020-02-11 | 2020-02-11 | Standardized and extensible fabricated foundation pit inner support system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010086473.3A CN111172998A (en) | 2020-02-11 | 2020-02-11 | Standardized and extensible fabricated foundation pit inner support system |
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| CN111172998A true CN111172998A (en) | 2020-05-19 |
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| CN202010086473.3A Pending CN111172998A (en) | 2020-02-11 | 2020-02-11 | Standardized and extensible fabricated foundation pit inner support system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111764401A (en) * | 2020-07-10 | 2020-10-13 | 王冰璇 | Full-assembly combined plate support |
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