CN115162364B - Foundation pit support steel enclosing purlin, support structure and mounting and dismounting method thereof - Google Patents
Foundation pit support steel enclosing purlin, support structure and mounting and dismounting method thereof Download PDFInfo
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- CN115162364B CN115162364B CN202211087621.9A CN202211087621A CN115162364B CN 115162364 B CN115162364 B CN 115162364B CN 202211087621 A CN202211087621 A CN 202211087621A CN 115162364 B CN115162364 B CN 115162364B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
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Abstract
The invention relates to the technical field of buildings, in particular to a foundation pit support steel purlin, a foundation pit support system and an installation and disassembly method thereof. The foundation pit supporting steel purlin comprises two steel components which are vertically arranged at intervals; the side interval of steel member sets up a plurality of lacing plates, has alleviateed the steel and has enclosed the purlin dead weight, reduces the cost, has solved current steel and has enclosed the purlin and be difficult to retrieve, the great problem of weight. Meanwhile, the standardized production of the purlin system is realized by arranging the standard section and the non-standard section of the steel purlin. The steel purlin is connected with a support pile through the way of basket bolts implanting double rows of steel bars, improves the vertical supporting mode of adopting the bracket in the traditional structure, and the maximum degree is saved the time limit for a project when guaranteeing the security. A corner adjustable device is arranged between an inclined support and a steel support in a foundation pit supporting system to adjust the angle between the enclosing purlin and the steel support, and the problem that the supporting corner in the existing steel support system structure is not adjustable is solved.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a foundation pit supporting steel enclosing purlin, a supporting structure and an installation and disassembly method thereof.
Background
Steel among the traditional supporting construction of foundation ditch encloses the purlin and is H shaped steel structure, and its bearing capacity and stability are lower. The stable bearing capacity can be effectively improved by adopting the box-type steel purlin surrounding form, but the web plate is continuous, the self weight is large, and the manufacturing cost is high. Meanwhile, the traditional steel enclosing purlin splicing mode is welding connection, and the problems that welding residual stress is difficult to recover and the construction period and the engineering cost are obviously increased and the whole carbon emission of the engineering is high exist. In addition, the existing steel enclosing purlin system does not achieve standardized factory prefabrication and field assembly construction, and the reason is that the standardized enclosing purlin is not coordinated with the shape and the size of a foundation pit.
The vertical support form of current steel purlin mainly has three kinds: the first one is for enclosing the purlin below setting up the bracket at the steel (like authorized notice No. CN 215715348U "a steel encloses the connection structure of purlin and fender pile", this processing mode need in the actual operation excavate 2-3 meters in advance in steel encloses purlin department, after having installed the bracket with the steel again enclose the purlin hoist and mount to the bracket on, the site operation flow is more loaded down with trivial details, the operation of being not convenient for, the time limit for a project is longer. The second mode is that a lifting lug is arranged above the steel enclosing purlin and is connected with a turnbuckle telescopic device (such as an authorized bulletin No. CN 215715362U connection device for the steel enclosing purlin), but the tightness degree of the turnbuckle directly influences the levelness of the enclosing purlin after the soil below is excavated, so that the turnbuckle is difficult to adjust, the bearing capacity of the turnbuckle is limited, and the safety is poor; the third is that fasteners are directly connected with steel sheet piles on the side surfaces of the purlins (such as an authorized bulletin No. CN 216194797U Steel purlin connecting device), but the connecting mode has lower shearing resistance and tensile bearing capacity and poorer safety. In addition, current vertical bracing mode mainly encloses the purlin to H shaped steel, and it is less to the higher box shaped steel of bearing capacity and stability enclose the purlin concern, and this box shaped steel encloses purlin weight simultaneously and is great relatively, and is less with fender pile connection space, and current H shaped steel encloses that the purlin supports and can't direct application in box shaped steel with the connected form and encloses the purlin.
Traditional steel encloses the corner of being connected of purlin and steel shotcrete fixed, can't adjust, and foundation ditch plane shape is various, adopts the steel shotcrete system of fixed corner to be applicable to all foundation ditches, and the universality is relatively poor.
Finally, the existing efficient and reliable system dismounting method for the steel purlin is less, and the traditional mounting mode of cutting and welding obviously increases the construction period.
Disclosure of Invention
The invention aims to provide a foundation pit support steel enclosing purlin, a foundation pit support system and an installation and disassembly method thereof, and aims to solve the technical problems in the prior art.
In order to solve the technical problem, the foundation pit supporting steel purlin provided by the invention comprises two steel members which are vertically arranged at intervals; the side of steel member is along its length direction interval in proper order and the level set up a plurality of lacing plates.
Further, the gusset plate is bolted to the steel member.
Further, the upper end of the gusset plate is higher than the steel member above; rib planting holes are formed in the parts, protruding out of the steel member, of the batten plates; the steel member upper surface is provided with the otic placode, be equipped with the lewis hole on the otic placode.
Further, the invention also provides a foundation pit supporting system which comprises a steel support, an inclined support, a supporting pile, a movable head and the foundation pit supporting steel purlin; the foundation pit supporting steel purlin is connected with the supporting piles; the end part of the steel support is provided with the movable head; the movable head is connected with the foundation pit supporting steel purlin through the inclined support.
Furthermore, the foundation pit supporting system also comprises a corner adjustable device for adjusting the angle between the inclined support and the steel support; the corner adjustable device is a pad beam; and the two end surfaces of the pad beam are respectively parallel to and fixed with the end surface of the inclined support and the end surface of the movable head.
Furthermore, the foundation pit supporting system also comprises a corner adjustable device for adjusting the angle between the inclined support and the steel support; the corner adjustable device is of a universal spherical hinge structure; the universal spherical hinge structure comprises a spherical hinge seat and a universal ball rotatably arranged on the spherical hinge seat; the spherical hinge seat is fixed with the adjustable head; the inclined support is fixed with the universal ball.
Further, the foundation pit supporting system also comprises a straight reinforcing steel bar and a bent reinforcing steel bar; the straight steel bars and the bent steel bars are all mantle fiber steel bars; the straight-line steel bars are horizontally arranged; one end of the linear steel bar is fixed with the supporting pile in a bar planting mode, and the other end of the linear steel bar penetrates through a bar planting hole in the foundation pit supporting steel purlin and is fixed with the foundation pit supporting steel purlin through a nut; one end of the bent steel bar is fixed with the supporting pile through a steel bar planting mode, and the other end of the bent steel bar is fixed with the foundation pit supporting steel purlin through a turnbuckle bolt.
Furthermore, a plurality of foundation pit support steel purlins are provided, and a splicing cover plate is arranged between every two adjacent foundation pit support steel purlins; the steel member with the concatenation apron passes through the bolt fastening.
Further, the invention also provides an installation method of the foundation pit supporting system, which comprises the following steps:
pouring the support piles in underground soil;
digging an underground soil body to a preset depth and tamping to keep the underground soil body flat;
positioning and placing the foundation pit supporting steel enclosing purlin at the corner, and then installing the rest foundation pit supporting steel enclosing purlins and the inclined support along the branch direction of the foundation pit supporting steel enclosing purlin at the corner;
covering an isolation film on one side of the foundation pit support steel purlin close to the support piles, and then pouring early-strength concrete between the foundation pit support steel purlin and the support piles;
and a corner adjustable device, a movable joint and a steel support are sequentially arranged.
Further, the invention also provides a method for disassembling the foundation pit supporting system, which comprises the following steps:
each section of steel support is hung by a cable;
then the loose head is unloaded to loose the support;
removing the connecting bolts of the steel support and the movable head;
and (4) dismantling the corner adjustable device, the inclined support and the foundation pit support steel purlin.
By adopting the technical scheme, the invention has the following beneficial effects:
according to the foundation pit supporting steel enclosing purlin provided by the invention, a box type form is adopted on the traditional H-shaped steel enclosing purlin form, so that the stable bearing capacity of the enclosing purlin is improved; the steel enclosing purlin is arranged on the side surface of the steel member at intervals by the batten plates, so that the dead weight of the steel enclosing purlin is reduced, and the manufacturing cost is reduced; simultaneously, the batten plate encloses the purlin with the steel and steel encloses the connection between the purlin and adopts bolted connection for steel encloses purlin system recovery rate higher, and the carbon emission is low. The efficient installation of the steel purlin is realized by implanting double rows of steel bars on the supporting piles and matching with the turnbuckle and the thread structure, and the safety is high. The change of the corner between the steel purlin and the steel support is realized through the corner adjustable device, and the adaptability of the whole steel support system is improved. Finally, a high-efficiency and reliable systematic steel support and steel purlin dismounting and mounting method is provided, so that the construction period is further saved, and the construction cost is reduced.
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 front view of a foundation pit support steel purlin provided by an embodiment of the invention;
FIG. 2 is a side view of the foundation pit supporting steel purlin of FIG. 1;
FIG. 3 is a schematic diagram of a steel purlin splice provided in an embodiment of the present invention;
fig. 4 is a schematic view of a foundation pit supporting system provided by an embodiment of the invention;
fig. 5 is a schematic diagram of connection between a rotation angle adjustable device (a pad beam) and an inclined support provided by an embodiment of the present invention.
Fig. 6 is a schematic connection diagram of a rotation angle adjustable device (universal spherical hinge structure) and an inclined support provided by an embodiment of the present invention;
fig. 7 is a schematic structural diagram of connection between a support pile and a steel purlin provided in an embodiment of the present invention;
fig. 8 is another schematic structural diagram of connection of a support pile and a steel purlin provided by the embodiment of the invention.
Reference numerals:
1-a steel member; 2-batten plate; 3-a bolt;
4-planting tendon holes; 5, splicing the cover plate; 6, supporting the steel enclosing purlin by the foundation pit;
7-an inclined support; 8-a bolster; 9-activating head;
10-steel support 11-turnbuckle; 12-a spherical hinge base;
13-supporting piles; 14-a universal ball; 15-straight steel bars;
16-bending the steel bar; 17-hanging holes; 18-ear plate.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1 and 2, the foundation pit supporting steel purlin 6 provided by the embodiment comprises two steel members 1 which are vertically arranged at intervals; the side surface of the steel member 1 is provided with a plurality of gusset plates 2 at intervals in the longitudinal direction thereof in order and horizontally. According to the invention, the plurality of batten plates 2 are arranged at intervals on the side surface of the steel member 1, so that the self weight of the steel purlin is reduced, and the manufacturing cost is reduced. In underground engineering, the steel purlin mainly bears bending moment and shearing force, and the bending stability of the steel purlin can be improved by the lattice type construction mode.
In addition to the above embodiment, the gusset plate 2 is further bolted 3 to the steel member 1. The bolt 3 connection can guarantee the intensity and the rigidity of the connection part, and is convenient to disassemble and assemble.
Preferably, the steel member 1 is an H-shaped steel. The batten plate 2 and the flange of the H-shaped steel are both provided with screw holes, and the bolt 3 penetrates through the screw holes in the batten plate 2 and the screw holes in the H-shaped steel simultaneously to enable the batten plate and the H-shaped steel to be firmly connected. The upper and lower H-shaped steels are spaced by 200mm in width so as to facilitate the screwing of the bolts 3.
Preferably, the upper end of the gusset plate 2 is higher than the upper steel member 1; the position of the batten plate 2 protruding out of the steel member 1 is provided with a bar planting hole 4, the upper surface of the steel member 1 is provided with an ear plate 18, and the ear plate 18 is provided with a hanging hole 17. The fender pile 13 is connected through the reinforcing bar realization with steel member 1, and bar planting hole 4 is convenient for on-spot bar planting, and this bar planting mode can provide sufficient operating space for constructor, and does not enclose 3 production position conflicts of connecting bolt between the purlin with the steel, convenient construction. Preferably, the gusset plate 2 extends about 120mm outside the steel member 1.
For a typical engineering example, the standard value of the lateral soil pressure of the foundation pit is 300kN/m, and the design values of the maximum bending moment and the shear force applied to the steel purlin are 2658 kN · m and 1833 kN respectively. Checking the shearing resistance and the bending resistance stability of the steel enclosing purlin according to the relevant specifications of the steel structure to obtain H-shaped steel with the model number of HN 700 multiplied by 300 multiplied by 13 multiplied by 24; for the batten plate 2, in order to ensure that the batten plate has enough linear rigidity (namely the linear rigidity of the batten plate 2 is 6 times of the linear rigidity of the H-shaped steel surface), 350 mm by 20mm steel plates are adopted and arranged at intervals of 425 mm; the H-shaped steel and the batten plate 2 adopt an equal-strength connection mode, 6M 30 high-strength bolts are adopted for the H-shaped steel beam with the HN 700 multiplied by 300 multiplied by 13 multiplied by 24 model for friction type connection, and the model and the number of the high-strength bolts can be adjusted according to different H-shaped steel models and sizes of the batten plate 2.
The invention also provides a foundation pit supporting system which comprises a steel support 10, an inclined support 7, a supporting pile 13, a flexible joint 9 and the foundation pit supporting steel purlin 6; the foundation pit supporting steel surrounding purlin 6 is connected with a supporting pile 13; the end part of the steel support 10 is provided with a loose head 9, and the loose head 9 is connected with the foundation pit supporting steel purlin 6 through an inclined support 7. The steel enclosing purlin system is composed of standard section enclosing purlins with fixed sizes and non-standard section enclosing purlins adjusted according to the shape and the size of an actual foundation pit, and therefore the adaptability of the system is improved.
As shown in fig. 3, on the basis of the above embodiment, further, a plurality of foundation pit support steel purlins 6 are provided, and a splicing cover plate 5 is provided between two adjacent foundation pit support steel purlins 6; the steel member 1 and the splice cover plate 5 are fixed by bolts 3. The steel member 1 and the splicing cover plate 5 are provided with the bolts 3, the steel enclosing purlins are spliced in an equal strength mode by adopting high-strength bolts 3 (M24-M30) with large nominal diameters in a friction type connection mode, and the joint connection parts are enabled to have enough rigidity while the bending resistance, shearing resistance and tensile strength of the joint connection parts are equivalent to those of the parts which are not spliced, so that the deformation of the foundation pit is limited to the maximum degree.
As shown in fig. 4, the invention further provides a foundation pit supporting system, which comprises a steel support 10, an inclined support 7, a supporting pile 13, a flexible joint 9 and the foundation pit supporting steel purlin 6; the foundation pit supporting steel surrounding purlin 6 is connected with the supporting piles 13; the end part of the steel support 10 is provided with a flexible head 9; the activating head 9 is connected with the foundation pit supporting steel surrounding purlin 6 through the inclined support 7.
On the basis of the above embodiment, further, the foundation pit supporting system further includes a corner adjustable device, and the corner adjustability of the device can be realized by three ways:
1) And (3) customizing a pad beam 8 according to the arrangement of the supporting system (shown in figure 5), wherein two end surfaces of the pad beam 8 are respectively parallel to and fixed with the end surface of the inclined support 7 and the end surface of the adjustable head 9. The angle between the inclined support 7 and the adjustable head 9 is changed by changing the inclination angle of the end surface of the pad beam 8, so that the angle between the inclined support 7 and the steel support 10 is changed. Wherein the pad beam 8 is constructed similar to the inclined bracket 7 to facilitate the support of the axial force transmission, wherein the positions of the steel members and the stiffening ribs in the pad beam 8 at the connection with the inclined bracket 7 are the same as the positions of the steel plates and the stiffening ribs in the inclined bracket 7 (as shown in fig. 5). The two sides of the pad beam 8 are connected with the inclined support 7/the movable head 9 by adopting high-strength bolt friction type connection. The connecting side of the pad beam 8 and the steel support 10 mainly bears the axial force transmitted by the support, and the shearing force borne by the bolt at the connecting part is caused by self weight; the connecting side of the pad beam 8 and the inclined support 7 needs to consider the transverse shearing force when the axial force is transmitted and supported besides the axial force. Preferably, for a typical engineering example, the design value of the supporting axial force is 5500 kN, the required bearing shearing force at the connecting node of the pad beam 8 and the inclined support 7 is 1375 kN, trial calculation is carried out according to the requirement, 15M 27 high-strength bolts are required to be arranged for friction type connection, and therefore 24M 27 high-strength bolts are arranged at the connecting position in the engineering example according to related construction and safety requirements.
2) A universal ball joint structure (shown in fig. 6) is adopted, and comprises a ball joint seat 12 and a universal ball 14 rotatably arranged on the ball joint seat 12; the spherical hinge seat 12 is fixed with the adjustable head 9; the inclined support 7 is fixed with a universal ball 14. The rotation of the tilting support 7 relative to the swivel head 9 is achieved by the rotation of the universal ball 14 on the ball joint 12, so that the angle between the tilting support 7 and the steel support 10 is adjusted.
3) A spherical rubber bearing.
The corner adjustable device is arranged between the inclined support 7 and the steel support 10, so that the change of the corner between the inclined support 7 and the steel support can be realized, the device is suitable for all foundation pits, and the universality is high.
As shown in fig. 7 and fig. 8, on the basis of the above embodiment, further, the steel bar further comprises a straight steel bar 15 and a bent steel bar 16; the straight steel bars 15 and the bent steel bars 16 are all mantle fiber steel bars; the straight reinforcing steel bars 15 are horizontally arranged; one end of the linear steel bar 15 is fixed with the support pile 13 in a steel bar planting mode, and the other end of the linear steel bar penetrates through the steel bar planting hole 4 in the foundation pit support steel purlin 6 and is fixed with the foundation pit support steel purlin 6 through a nut; one end of the bent reinforcing steel bar 16 is fixed with the supporting pile 13 in a bar planting mode, and the other end of the bent reinforcing steel bar is fixed with the foundation pit supporting steel surrounding purlin 6 through the turnbuckle 11. In this embodiment, the retaining pile 13 and the foundation pit retaining steel purlin 6 are fixed to the threaded structure by implanting double rows of steel bars (straight steel bars and bent steel bars) in cooperation with turn bolts (fig. 7 and 8). Specifically, the end parts of the lower row of steel bars (the linear steel bars 15) are threaded, one ends of the threaded steel bars penetrate through the bar embedding holes 4 in the purlin enclosing batten plates 2 and are fixed by matching with nuts, and the other ends of the threaded steel bars are embedded into the supporting piles 13. Meanwhile, the upper row of reinforcing steel bars (bent reinforcing steel bars 16) are connected with the purlin surrounding lug plate 18 by the turn buckle 11 with one end connected with the reinforcing steel bar lifting rope and the other end provided with the U-shaped lock catch, and then the turn buckle 11 is screwed down, so that the connection reliability is improved; the tightness degree of the turn buckle 11 is adjustable, so that the supporting piles are stressed uniformly. The connection mode is reliable and convenient for later-period dismantling and recycling.
In conclusion, the foundation pit supporting system provided by the invention optimizes the connection mode on the basis of the traditional welded box-type steel purlin, and forms a novel lattice-type steel purlin member by splicing the batten plates 2 and the H-type steel through full bolts. Then based on this novel steel encloses the research and development that the purlin carries out key connected node structure, finally provides a complete assembly lattice formula steel and encloses purlin system (excavation supporting system). The system comprehensively cancels field welding operation, improves the recovery utilization rate, reduces the construction cost, reduces the carbon emission and saves the construction period. In order to facilitate the practical engineering application of the invention, deep mechanical analysis is needed according to the relevant data of typical engineering cases, and the standard section size and the key connecting node structure of the common lattice type steel purlin are determined.
The invention also provides an installation method of the foundation pit supporting system, which comprises the following steps:
digging a soil body to a preset elevation and tamping the soil body to keep the soil body flat, then positioning the foundation pit supporting steel enclosing purlin 6 at the corner, and then installing the residual foundation pit supporting steel enclosing purlin 6 and an inclined support 7 along the branch direction of the foundation pit supporting steel enclosing purlin 6 at the corner; covering an isolation film on one side of the foundation pit supporting steel purlin 6 close to the support piles 13, and then pouring early-strength concrete between the foundation pit supporting steel purlin 6 and the support piles 13 so that lateral soil pressure can be effectively transmitted to a supporting system and the construction period is saved; and a corner adjustable device, a movable head 9 and a steel support 10 are sequentially arranged.
The invention also provides a method for disassembling the foundation pit supporting system, which comprises the following steps:
each section of steel support 10 is suspended by cables, and then the adjustable head 9 is unloaded to loose the support; dismantling the connecting bolts of the steel support 10 and the adjustable head 9 and hoisting the connecting bolts out of the site; and (4) dismantling the corner adjustable device, the inclined support 7 and the foundation pit support steel enclosing purlin 6. Because the steel encloses between the purlin and the concrete of filling in with the barrier film separation, cohering power between the two is little, makes the steel enclose purlin system directly demolish convenient construction.
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 (6)
1. A foundation pit supporting system is characterized by comprising a steel support, an inclined support, a supporting pile, a movable head and a foundation pit supporting steel purlin; the foundation pit supporting steel enclosing purlin is connected with the supporting pile; the end part of the steel support is provided with the flexible head; the movable head is connected with the foundation pit supporting steel purlin through the inclined support;
the foundation pit support steel purlin comprises two steel components which are vertically arranged at intervals; the side surface of the steel member is sequentially provided with a plurality of batten plates at intervals along the length direction and horizontally, and the upper ends of the batten plates are higher than the steel member above; rib planting holes are formed in the parts, protruding out of the steel member, of the batten plates;
the steel bar bending machine also comprises a linear steel bar and a bending steel bar;
the straight steel bars and the bent steel bars are all mantle fiber steel bars; the straight-line steel bars are horizontally arranged; one end of the linear steel bar is fixed with the supporting pile in a bar planting mode, and the other end of the linear steel bar penetrates through a bar planting hole in the foundation pit supporting steel purlin and is fixed with the foundation pit supporting steel purlin through a nut;
one end of the bent steel bar is fixed with the supporting pile in a bar planting mode, and the other end of the bent steel bar is connected with the purlin surrounding lug plate through a turnbuckle; one end of the turn buckle is connected with the steel bar lifting rope, and the other end of the turn buckle is a U-shaped lock catch;
covering an isolation film on one side of the foundation pit support steel enclosing purlin close to the support piles, and then pouring early-strength concrete between the foundation pit support steel enclosing purlin and the support piles.
2. The excavation supporting system of claim 1, further comprising a corner adjustable device for adjusting an angle between the angled support and the steel support;
the corner adjustable device is a pad beam; and the two end surfaces of the pad beam are respectively parallel to and fixed with the end surface of the inclined support and the end surface of the movable head.
3. The excavation supporting system of claim 1, further comprising a corner adjustable device for adjusting an angle between the angled support and the steel support;
the corner adjustable device is of a universal spherical hinge structure; the universal spherical hinge structure comprises a spherical hinge seat and a universal ball rotatably arranged on the spherical hinge seat;
the spherical hinge seat is fixed with the adjustable head; the inclined support is fixed with the universal ball.
4. The foundation pit supporting system according to claim 1, wherein the foundation pit supporting steel purlins are multiple, and a splicing cover plate is arranged between every two adjacent foundation pit supporting steel purlins; the steel member with the concatenation apron passes through the bolt fastening.
5. A method of installing an excavation supporting system as claimed in any one of claims 1 to 4, including the steps of:
pouring the support piles in underground soil;
digging an underground soil body to a preset depth and tamping to keep the underground soil body flat;
positioning and placing the foundation pit supporting steel enclosing purlin at the corner, and then installing the rest foundation pit supporting steel enclosing purlins and the inclined support along the branch direction of the foundation pit supporting steel enclosing purlin at the corner;
covering an isolation film on one side of the foundation pit support steel purlin close to the support piles, and then pouring early-strength concrete between the foundation pit support steel purlin and the support piles;
and a corner adjustable device, a movable joint and a steel support are sequentially arranged.
6. A method of disassembling an excavation supporting system as claimed in any one of claims 1 to 4, including the steps of:
each section of steel support is hung by a cable;
then the loose head is unloaded to loose the support;
removing the connecting bolts of the steel support and the movable head;
and (4) dismantling the corner adjustable device, the inclined support and the foundation pit support steel purlin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211087621.9A CN115162364B (en) | 2022-09-07 | 2022-09-07 | Foundation pit support steel enclosing purlin, support structure and mounting and dismounting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211087621.9A CN115162364B (en) | 2022-09-07 | 2022-09-07 | Foundation pit support steel enclosing purlin, support structure and mounting and dismounting method thereof |
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| CN115162364A CN115162364A (en) | 2022-10-11 |
| CN115162364B true CN115162364B (en) | 2022-12-09 |
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| JPH053351U (en) * | 1991-06-27 | 1993-01-19 | 株式会社大林組 | Bonding structure of steel materials for uprising |
| CN103352470B (en) * | 2013-07-29 | 2015-04-15 | 北京住总集团有限责任公司 | Foundation pit supporting structure and construction method thereof |
| CN209308066U (en) * | 2018-09-04 | 2019-08-27 | 中国十九冶集团有限公司 | A kind of pipe gallery foundation pit supporting construction |
| CN110374113B (en) * | 2019-07-26 | 2021-04-09 | 中建隧道建设有限公司 | Quick support changing method and movable joint suitable for steel pipe support foundation pit |
| CN213653467U (en) * | 2020-08-31 | 2021-07-09 | 中铁第四勘察设计院集团有限公司 | Assembled foundation ditch steel bearing structure |
| CN215715355U (en) * | 2021-06-02 | 2022-02-01 | 北京市政路桥股份有限公司 | Deep foundation pit supporting structure |
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2022
- 2022-09-07 CN CN202211087621.9A patent/CN115162364B/en active Active
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