CN107503358B - Modularized foundation pit steel truss supporting structure - Google Patents
Modularized foundation pit steel truss supporting structure Download PDFInfo
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- CN107503358B CN107503358B CN201710832630.9A CN201710832630A CN107503358B CN 107503358 B CN107503358 B CN 107503358B CN 201710832630 A CN201710832630 A CN 201710832630A CN 107503358 B CN107503358 B CN 107503358B
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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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C9/00—Special pavings; Pavings for special parts of roads or airfields
- E01C9/08—Temporary pavings
- E01C9/083—Temporary pavings made of metal, e.g. plates, network
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a modularized foundation pit steel truss supporting structure. The modularized foundation pit steel truss support structure is composed of a single row or a plurality of rows of planar truss structures, each planar truss structure comprises basic structural units and edge members, each planar truss structure is formed by splicing the basic structural units, and the basic structural units positioned at the edges of two ends of the planar truss structure are connected with the edge members; the plane truss structure is formed by splicing a plurality of basic structural units along a row, two adjacent basic structural units are connected through a middle connecting node, and the basic structural units at two ends after splicing are connected with an edge member through end connecting nodes; the basic structure unit consists of two chord members and an inclined web member, wherein the two chord members are arranged in parallel, and the two chord members are connected into a whole through the inclined web member. The invention has the characteristics of large bending bearing capacity and bending rigidity, and has the characteristics of unified basic structural specification, strong universality, high recycling rate, easy transportation, field installation and the like.
Description
Technical Field
The invention relates to the technical field of constructional structure engineering, in particular to a modularized foundation pit steel truss supporting structure.
Background
In the foundation pit excavation process, the supporting structure in the foundation pit plays an important role in maintaining the stability of the foundation pit. The traditional foundation pit supporting structure adopts a reinforced concrete structure, and the structure has the defects of low construction speed, long maintenance time, difficult energy conservation, environmental protection and the like, and is required to be dismantled in the later period. In contrast, the steel support structure in recent years has the advantages of convenient construction, high speed, capability of applying prestress, repeated use and the like, and accords with the national development concept of energy conservation and environmental protection.
For the foundation pit supporting structure, the foundation pit supporting structure has good structural performance to ensure the stability of a foundation pit supporting system, strictly control the horizontal displacement of a foundation pit retaining wall and protect the safety of surrounding built buildings and the stability of sites, roads and underground pipeline; meanwhile, the plane area is reduced under the possible condition, so that a barrier-free construction space which is as large as possible is created for the construction of the foundation and the basement of the building and the earthwork excavation, and the construction machine which enters the foundation pit can freely perform construction operation. The existing foundation pit steel support structure also has certain problems, such as dense planar arrangement, poor node performance and the like in the steel pipe support technology, and the problem of dense planar arrangement is not well solved although the node performance of the profile steel combined support structure is improved.
Although the steel support is reusable from the point of view of the service life cycle, and the steel of the waste components can be recycled for producing new components, due to the variety of foundation pit forms, different component forms and specifications are usually required to be customized according to different conditions, and the price of the steel is relatively high, so that the early investment of the foundation pit steel support structure is huge, and the utilization rate of part of the components is low, which seriously affects the popularization and the use of the foundation pit steel support structure; for straight sides of the pit, the earth pressure at the edges of the pit is directed inward to form an approximately evenly distributed pressure effect, which places high demands on the bending resistance of the support structures within the pit. Therefore, the prior art lacks a foundation pit supporting structure which has strong universality, high recycling rate and can provide good bending resistance.
Disclosure of Invention
The invention provides a modularized foundation pit steel truss supporting structure, which takes the functional characteristics of a foundation pit supporting structure and the range of vehicle transportation size into consideration, and combines the stress characteristics of a steel truss structure. Meanwhile, in the construction process, the gap between two chords of the truss can be utilized to perform foundation pit earthwork excavation and other operations.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the steel truss support structure is composed of single-row or multi-row planar truss structures, each planar truss structure comprises basic structural units and edge members, each planar truss structure is formed by splicing the basic structural units, the basic structural units located at the edges of two ends of each planar truss structure are connected with the edge members, and the edge members are connected with other structures of a foundation pit.
The other structures of the foundation pit refer to structures which are positioned at two sides of the steel truss supporting structure and connected with the steel truss supporting structure, and provide constraint vertical to the edge direction of the foundation pit for the steel truss supporting structure, and specifically can be a diagonal bracing structure which is vertical to the steel truss supporting structure and spans two opposite sides of the foundation pit, a steel truss supporting structure vertical to the connected edges of the foundation pit of the steel truss supporting structure, diagonal bracing structures which are obliquely arranged at the corner positions of the foundation pit, and the like.
The steel truss support structure is formed by splicing a plurality of basic structural units along a row, two adjacent basic structural units are connected through a middle connecting node, and the basic structural units at two ends of the spliced truss structure are connected with edge members through end connecting nodes.
The basic structural unit is a truss structure.
The edge member is an I-shaped section member with end plates at two ends and stiffening ribs in the middle.
All components in the steel truss support structure are made of steel materials.
The basic structural unit consists of two chord members and an inclined web member, wherein the two chord members are arranged in parallel, the two chord members are connected into a whole through the inclined web member, and the two chord members are directly connected with the inclined web member through welding seams.
In the basic structural unit, two ends of each chord member are respectively fixed with an end plate, the end plates are positioned on one side far away from the diagonal web members and are flush with the outer sides of the flanges of the chord members, so that the end plates are conveniently connected with the surrounding purlins and connected between the connected rows when forming a multi-row truss structure, one side close to the diagonal web members extends beyond the flanges of the chord members, and stiffening ribs are connected between the flanges of the chord members at the extending sections.
The multi-row planar truss structure is formed by connecting a plurality of single-row planar truss structures through bolts, and specifically, the connection between two adjacent rows of planar truss structures is formed by connecting flanges of chords of the two rows of planar truss structures through bolts.
The flanges of the chord members are connected with the surrounding purlin around the foundation pit through bolts, and the self-weight load of the chord members is born through arranging brackets.
The end plates of the two chords are connected with each other through an intermediate connecting node between two adjacent basic structural units, the intermediate connecting node is a bolt connecting node, and the end plates of the two basic structural units are connected through bolts.
The end plates of the chords and the flanges of the edge members are connected with each other through end connection nodes, the end connection nodes are bolt connection nodes, and the end plates of the basic structural units and the edge members are connected through bolts.
The steel truss support structure can be used as a support structure in a foundation pit, and mainly bears the action of bending moment under the action of soil pressure at the edge of the foundation pit.
The intermediate connection nodes between adjacent basic structural units are determined according to the equal-strength method of the bearing capacity and the chord axial bearing capacity, and the local stability of the end plate is ensured at the welding position of the end plate and the chord of the chord by a stiffening rib welding method.
The chord member outer side flange plates of the adjacent rows of truss structures are connected through bolts between the single-row planar truss structures to form a multi-row planar truss structure. When multiple rows of trusses are combined, the lengths of the trusses in different rows can be the same, and the multiple rows of trusses can be adopted only in the areas with large bending moment.
The bolt connection among different rows of truss structures mainly transmits shearing force, and the design of the connection is checked according to the shearing bearing capacity.
The edge members of the present invention may be connected to other members of the foundation pit.
The geometric dimension of the basic structural unit of the invention meets the transportation width limit value of the vehicle under the condition of meeting the foundation pit earthwork excavation construction requirement and the truss bending bearing capacity.
The steel truss support structure has excellent bending resistance, sparse internal components and simple structural form, is arranged in a foundation pit as a support structure, and can play a role in resisting lateral soil pressure at the edge of the foundation pit.
The invention is mainly assembled by a plurality of completely same basic structural units and is respectively connected with edge members at two side edge positions to form a steel truss structure, thereby realizing modularization and having the advantages of strong universality, high recycling rate and the like. And the truss structure is utilized to resist the action of the side pressure of soil at the edge of the foundation pit by utilizing the good bending bearing capacity and bending rigidity of the truss structure.
When using steel supports as the support structure for the foundation pit, for straight sections between two bracing structures across opposite sides of the foundation pit, between a bracing and a gusset, between two gussets, and between a bracing or gusset and the vertical foundation pit edge, existing structures often employ purlins directly, prestressed arches and prestressed fish bellies to bear the effect of the earth pressure at the foundation pit edge (perpendicular to the foundation pit edge). The support structure in this position is mainly subjected to bending moments under the influence of the earth pressure. Because the purlin itself has poor buckling resistance, the span of the straight edges must be small enough when the purlin is used directly. The prestress arch structure has a complex structural form, has a large correlation with specific parameters (such as span, sagittal height and the like), and is closely related with a connecting structure at the arch springing, so that the prestress arch structure has low universality and needs to design and manufacture corresponding structures according to different conditions. The prestress fish belly type structure resists the action of soil pressure at the edge of a foundation pit through stretching the upper chord steel rope and pushing force of the steel rope to the inner column of the fish belly, and although the higher bending bearing capacity can be theoretically obtained by adopting the high-strength steel rope, the bending rigidity of the whole structure is smaller because the deformation of the fish belly type structure has large correlation with the rigidity of the steel rope axis and the section of the prestress steel rope is smaller in general, so that the applicable span is limited, the steel rope stretching requirement is higher, and the construction is complex. The steel truss is an excellent bending structure, utilizes the couple formed by axial loads of the chords to resist bending moment, and simultaneously utilizes the axial stress of the diagonal web members to resist shearing force, has the characteristics of high bending rigidity, high bending bearing capacity and the like, and is widely applied to various bending structures. However, in order to obtain excellent bending resistance, the truss structure is generally large in cross-sectional size, which causes great trouble in transportation and installation of the foundation pit steel support structure requiring recycling. The structure adopts a modularized mode, considers the width limitation of the transport vehicle, and utilizes identical basic structural units and a small number of edge members to form a truss structure through on-site bolting and assembling. Therefore, the method solves the problems of transportation and installation, can utilize the excellent bending performance of the truss structure, can adjust the arrangement number and arrangement of the trusses according to the actual span and the soil pressure, has the characteristics of strong universality, high recycling rate and the like, and can greatly reduce the early-stage fund investment of the foundation pit steel support structure.
Compared with the prior art, the invention has the beneficial effects that:
1) The basic structural units are adopted for splicing and assembling to form the truss structure with large bending bearing capacity and bending rigidity, and the effect of soil pressure at the edge of the foundation pit can be effectively resisted.
2) The basic structural unit has simple form and uniform specification, can avoid the diversity of component forms and specifications, has strong universality and high recycling rate, can greatly reduce a large amount of early investment of the steel supporting structure, and effectively reduces the cost;
3) The internal barrier-free space of the formed truss structure is large, which is beneficial to excavation construction and other construction operations of foundation pit earthwork;
4) The size of the basic structural unit meets the transportation width of a transportation vehicle, so that the transportation efficiency can be effectively improved, and the logistics cost is reduced;
5) The single-row or multi-row truss structure can be formed, different foundation pit bearing requirements and span requirements are met, the single-row or multi-row truss structure can be assembled flexibly according to the soil pressure of the foundation pit and the span of the truss, and the applicability is strong.
In summary, the invention has the stress characteristics of large bending bearing capacity and large bending rigidity, and simultaneously has the characteristics of uniform basic structural specification, simple form, easy transportation, field installation and the like.
Drawings
Fig. 1 is a schematic plan view of a modular foundation pit steel truss support structure (single row) of the present invention.
Fig. 2 is a schematic plan view of a modular foundation pit steel truss support structure (two rows) of the present invention.
Fig. 3 is a plan view of the basic structural unit.
Fig. 4 is a top view of the basic structural unit.
Fig. 5 is a side view of the basic structural unit.
Fig. 6 is a plan view of the edge member.
Fig. 7 is a side view of an edge member.
Fig. 8 is an assembled schematic view of the modular foundation pit steel truss support structure of the present invention.
Figure 9 is a schematic view of the installation of the structure of the present invention into a foundation pit.
In the figure: the basic structural unit 1, the edge members 2, the intermediate connection nodes 3, the end connection nodes 4, the bolts 5, the chords 6, the end plates 61, the stiffening ribs 62, and the diagonal web members 7.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1, the invention comprises a single-row or multi-row planar truss structure, the planar truss structure comprises basic structural units 1 and edge members 2, the planar truss structure is mainly formed by splicing the basic structural units 1, the basic structural units positioned at the edges of the two ends of the planar truss structure are connected with the edge members 2, and the edge members 2 are connected with a foundation pit supporting structure.
The planar truss structure is formed by splicing a plurality of basic structural units 1 along a row, two adjacent basic structural units 1 are connected through an intermediate connecting node 3, and the basic structural units 1 at two ends after splicing are connected with edge members 2 through end connecting nodes 4.
As shown in fig. 3 to 5, the basic structural unit 1 is composed of two chords 6 and a diagonal web member 7, the two chords 6 are arranged in parallel, the two chords 6 are connected to form a whole through the diagonal web member 7, and two ends of the diagonal web member 7 are connected to flanges of the chords 6 through welding.
In the basic structural unit 1, two ends of two chords 6 are fixed with end plates 61, one side, far away from the diagonal web member 7, of each end plate 61 is flush with the flanges of the chords 6 so as to be convenient to connect with the surrounding purlins and connect with a plurality of rows of truss structures, one side, close to the diagonal web member 7, of each end plate 61 extends beyond the flanges of the chords 6, stiffening ribs 62 are connected between the extending sections and the flanges of the chords 6, and therefore bending moment can be transmitted when the inner sides of the chords are pulled under the action of soil pressure, and the effect of rigid connection is basically achieved.
As shown in fig. 6 and 7, in the specific implementation, bolt holes are formed in the end plates 61 at both ends of the chord member 6, bolt holes are also formed in the outer flange of each chord member 6, and bolt holes are formed in the flanges of the edge member 2.
As shown in fig. 2, the multiple rows of planar truss structures are connected by bolts through a plurality of single-row planar truss structures, specifically, the connection between two adjacent rows of planar truss structures is that the flanges of two chords 6 are connected with each other through bolts 5, and finally, the planar truss structure is built as shown in fig. 8.
The end plates 61 of the two chords are connected with each other through the intermediate connection node 3 between two adjacent basic structural units 1, and the end plates 61 of the two basic structural units 1 are connected with each other through bolts, so that the two chords in the plurality of basic structural units 1 are respectively connected with each other in a straight line arrangement. In particular, two connected end plates 61 are bolted between the intermediate sections of the chord upper and lower flange extents, and also between the extension sections of the two connected end plates 61 extending beyond the chord, such that the intermediate connection node 3 forms a single-sided overhanging end plate node.
The end plate 61 of the chord member and the edge member 2 are connected with each other through the end connection node 4 between the basic structural unit 1 and the edge member 2, the end connection node 4 is a bolt connection node, and the end plate 61 of the basic structural unit 1 and the edge member 2 are connected through bolts. In particular, the end plates 61 are bolted between the flanges of the edge member 2 and the intermediate section of the chord at the top and bottom flanges thereof, and also between the flanges of the edge member 2 and the extension of the end plates 61 extending beyond the chord, such that the intermediate connection node 3 forms an asymmetric bolting node.
Therefore, the invention utilizes the good bending bearing capacity and bending rigidity of the truss structure to resist the side pressure of soil at the edge of the foundation pit.
After the structure is built and connected to the foundation pit, the flanges of the chord members 6 are connected with the surrounding purlins around the foundation pit through bolts, and the brackets are used for bearing the dead weight of the supporting structure.
The basic structure unit form of the basic module is uniform, so that a large amount of early investment can be saved; the basic unit is of a planar structure, and the size meets the requirement of the automobile transportation width, so that the logistics cost is saved; the formed truss structure has large barrier-free space, and is convenient for construction operations such as foundation pit earthwork excavation and the like; the single-row or multi-row truss structure can be flexibly assembled according to the soil pressure of the foundation pit and the span of the truss, and the applicability is strong.
Examples of the invention
The sections of the basic unit chords and the web rods are H400x400x13x21, the steel is Q345 (design strength is 295 MPa), the total length of the basic unit chords is 2400mm, the distance between the central lines of the two chords is 3000mm, namely the size of the outer frame of the basic unit structure is 2400mm wide and 3400mm high, the soil pressure at the edge of a foundation pit is 150kN/m, and the steel truss support of the foundation pit is calculated according to a simply supported beam.
Table 1 calculation results
The calculation result shows that the invention has large bending bearing capacity and bending rigidity, effectively resists the action of soil pressure at the edge of the foundation pit, meets different foundation pit bearing requirements and span requirements, can flexibly assemble and form a single-row or multi-row truss structure according to the size of the soil pressure of the foundation pit and the span of the truss, and has remarkable technical effects.
Claims (6)
1. A modularization foundation ditch steel truss bearing structure, its characterized in that: the steel truss support structure is composed of single-row or multi-row planar truss structures, each planar truss structure comprises basic structural units (1) and edge members (2), each planar truss structure is formed by splicing the basic structural units (1), and the basic structural units positioned at the edges of the two ends of each planar truss structure are connected with the edge members (2);
the basic structural unit (1) consists of two chords (6) and an inclined web member (7), the two chords (6) are arranged in parallel, and the two chords (6) are connected into a whole through the inclined web member (7);
in the basic structural unit (1), end plates (61) are fixed at two ends of two chords (6), one side, far away from a diagonal web member (7), of each end plate (61) is flush with a flange of the chord member (6), one side, close to the diagonal web member (7), of each end plate (61) extends out of the flange of the chord member (6), and stiffening ribs (62) are connected between the flanges of the chord members (6) at the extending sections;
the flanges of the chord members (6) are connected with the surrounding purlins around the foundation pit through bolts, and dead weight loads are born through the arrangement of brackets.
2. The modular foundation pit steel truss support structure of claim 1, wherein: the planar truss structure is formed by splicing a plurality of basic structural units (1) along a row, two adjacent basic structural units (1) are connected through an intermediate connecting node (3), and the basic structural units (1) at two ends of the planar truss structure after splicing are connected with edge members (2) through end connecting nodes (4).
3. The modular foundation pit steel truss support structure of claim 1, wherein:
the connection between two adjacent rows of the planar truss structures is achieved through the fact that flanges of chords (6) of the two rows of the planar truss structures are connected with each other through bolts (5).
4. The modular foundation pit steel truss support structure of claim 1, wherein:
the end plates (61) of the two chords are connected with each other through an intermediate connection node (3) between two adjacent basic structural units (1), the intermediate connection node (3) is a bolt connection node, and the end plates (61) of the two basic structural units (1) are connected with each other through bolts.
5. The modular foundation pit steel truss support structure of claim 1, wherein:
the end plate (61) and the edge member (2) of the chord member are connected with each other through the end connection node (4), the end connection node (4) is a bolt connection node, and the end plate (61) and the edge member (2) of the basic structure unit (1) are connected through bolts.
6. Use of a modular foundation pit steel truss support structure according to any one of claims 1 to 5, wherein: the steel truss support structure is used as a support structure in the foundation pit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710832630.9A CN107503358B (en) | 2017-09-15 | 2017-09-15 | Modularized foundation pit steel truss supporting structure |
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| CN201710832630.9A CN107503358B (en) | 2017-09-15 | 2017-09-15 | Modularized foundation pit steel truss supporting structure |
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| CN110143526A (en) * | 2018-02-11 | 2019-08-20 | 中交路桥建设有限公司 | A kind of applicable different main push-towing rope centers away from deck unit erection gantry |
| CN113358470B (en) * | 2021-06-04 | 2022-09-13 | 山东理工大学 | Out-of-plane stable single steel truss test model |
| CN113529744A (en) * | 2021-08-24 | 2021-10-22 | 南通大学 | Large-span truss-like bearing structure outside pit of excavation supporting |
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| KR101078047B1 (en) * | 2008-02-01 | 2011-10-28 | (주)써포텍 | Precast concrete truss support structure and construction method thereof |
| CN103628673B (en) * | 2013-11-15 | 2015-11-11 | 华汇建设集团有限公司 | A kind of floor aluminum alloy pattern plate splicing formwork erecting structure system |
| CN205604259U (en) * | 2016-04-21 | 2016-09-28 | 东通岩土科技（杭州）有限公司 | A combination shaped steel supporting beam of truss -like |
| CN206128080U (en) * | 2016-09-09 | 2017-04-26 | 中建三局集团有限公司 | A support system for subway foundation pit |
| CN107034899A (en) * | 2017-06-07 | 2017-08-11 | 南京鼎卓岩土技术有限公司 | Assembled large-span truss structure and foundation pit support system |
| CN207512747U (en) * | 2017-09-15 | 2018-06-19 | 浙江大学 | A kind of modularization foundation pit steel truss support structure |
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