CN107503358A - Modularization foundation ditch steel truss support structure - Google Patents
Modularization foundation ditch steel truss support structure Download PDFInfo
- Publication number
- CN107503358A CN107503358A CN201710832630.9A CN201710832630A CN107503358A CN 107503358 A CN107503358 A CN 107503358A CN 201710832630 A CN201710832630 A CN 201710832630A CN 107503358 A CN107503358 A CN 107503358A
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- foundation ditch
- basic structural
- support structure
- structural unit
- steel truss
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- 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)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Rod-Shaped Construction Members (AREA)
- Foundations (AREA)
Abstract
The invention discloses a kind of modularization foundation ditch steel truss support structure.Modularization foundation ditch steel truss support structure is made up of single or plurality of rows of truss structural, truss structural includes basic structural unit and edge member, truss structural is mainly spliced by basic structural unit, and the basic structural unit positioned at truss structural edges at two ends is connected with edge member；Truss structural is spliced to form by multiple basic structural units along a row, is connected between two neighboring basic structural unit by intermediate connecting node, and the basic structural unit at both ends is connected by end connecting node with edge member after splicing；Basic structural unit is made up of two chord members and a diagonal web member, two chord member parallel arrangements, is connected to form one between two chord members by diagonal web member.The present invention has the loading characteristic that flexural capacity is big, bending rigidity is big, while has the characteristics that basic structure uniform specification, versatile, high recycling rate, is easy to transport and in-site installation.
Description
Technical field
The present invention relates to structural engineering technical field, more particularly to a kind of modularization foundation ditch steel truss support knot
Structure.
Background technology
In Excavation Process, the supporting construction in foundation ditch is important to keeping the stability of foundation ditch to have the function that.Pass
The foundation ditch supporting construction of system uses reinforced concrete structure, and this structure has that speed of application is slow, curing time is long and the later stage needs
The shortcomings of removing unfavorable energy-conserving and environment-protective.By contrast, the steel support structure occurred in recent years, generally with easy for construction, fast
Degree is fast, can apply prestressing force, repeatable the advantages that utilizing, and meets the idea of development of national energy-saving environmental protection.
For foundation ditch supporting construction, there should be good structural behaviour first, to ensure the steady of foundation pit supporting system
It is qualitative, the strict horizontal displacement for controlling foundation pit enclosure wall, the safety and place of protection surrounding built construction thing, road and buried pipe
The stability of netting twine；The area of plane is reduced under the conditions of possible simultaneously, is proposed earth excavation, the basis and underground of building
Accessible construction space as big as possible is created in the construction of room, and what the building machinery for facilitating access for foundation ditch can be freely construct
Operation.Existing foundation pit steel support structure also has the problem of certain, such as steel pipe support technology intensive, the section that horizontal layout be present
The problems such as point poor performance, although the joint behavior of shaped steel combination supporting construction makes moderate progress, the problem of horizontal layout is intensive, is simultaneously
It is not well solved.
Although from the point of view of using life cycle management, bracing members have repeatable utilization, and the steel of waste and old component can return
Receive, for producing new structural member, but due to the diversity of foundation ditch form, it usually needs different structures is customized according to different situations
Part form and specification, and the price of steel is of a relatively high, this make it that the early investment of foundation pit steel support structure is huge, partial component
Utilization rate is low, and this has a strong impact on that it is promoted the use of；For the flat side of foundation ditch, the soil pressure of margin of foundation pit is inwardly formed
The pressure effect of one approaches uniformity distribution, this just proposes very high requirement to the anti-bending strength of the supporting construction in foundation ditch.
Therefore, prior art lacks a kind of versatile, high recycling rate and can provide the foundation ditch supporting construction of good anti-bending strength.
The content of the invention
The functional characteristics of foundation ditch supporting construction and the scope of vehicle transport size are considered, with reference to the stress of steel truss structure
Characteristic, the invention provides a kind of modularization foundation ditch steel truss support structure, and using uniform specification, form is simple, meets vehicle
The basic structural unit of transportation clearance requirement, empty stomach Plane Steel Truss is formed by on-site consolidation, it is excellent using truss structure
Anti-bending strength more, to resist the effect of the soil lateral pressure of margin of foundation pit.Meanwhile truss two can be utilized in work progress
Space between chord member, carry out the operations such as pit earthwork excavation.
To achieve the above object, the present invention is using following technical scheme：
The steel truss support structure is made up of single or plurality of rows of truss structural, and truss structural includes
Basic structural unit and edge member, truss structural is mainly spliced by basic structural unit, positioned at plane girder
The basic structural unit of structure edges at two ends is connected with edge member, and edge member is connected with the other structures of foundation ditch.
Herein, the other structures of foundation ditch refer to positioned at the steel truss support structure both sides and with the steel truss support knot
Structure be connected, for the steel truss support structure provide perpendicular to margin of foundation pit direction constrain structure, be specifically as follows with it is described
Steel truss support structure it is vertical across the relative edge of foundation ditch two to support structure, perpendicular to the foundation ditch of the steel truss support structure
Be connected side steel truss support structure and positioned at diagonally disposed inclined support structure of foundation ditch corner positions etc..
Described steel truss support structure is spliced to form by multiple basic structural units along a row, two neighboring basic structure
Connected between unit by intermediate connecting node, the basic structural unit at truss structure both ends passes through end connecting node after splicing
Connected with edge member.
Described basic structural unit itself is truss structure.
Described edge member itself is that both ends carry end plate, and centre carries the I-shaped cross-section component of ribbed stiffener.
All parts in the steel truss support structure are made by Steel material.
Described basic structural unit is made up of two chord members and a diagonal web member, two chord member parallel arrangements, two chord members
Between be connected to form one by diagonal web member, two chord members directly use solder design with diagonal web member.
In described basic structural unit, the both ends of two chord members are respectively and fixedly provided with end plate, and end plate is located remotely from diagonal web member
It is concordant on the outside of the edge of a wing of side and chord member, company between multiple rows of truss structure phase platoon is connected and formed with purlin to facilitate
Connect, end plate extends beyond the edge of a wing of chord member in the side close to diagonal web member, and is connected between extension and the edge of a wing of chord member
There is ribbed stiffener.
Multiple rows of truss structural is bolted by multiple single truss structurals, specific adjacent two rows institute
Stating the connection between truss structural is inter-connected via a bolt joint between the edge of a wing of both chord members.
The edge of a wing of the chord member is connected by bolt with the purlin on foundation ditch periphery, and bears its deadweight by setting bracket
Load.
The end plate of both chord members is connected with each other by intermediate connecting node between two adjacent basic structural units, institute
The intermediate connecting node stated is bolt connection node, is bolted between the end plate of two basic structural units.
By end connecting node by the end plate of chord member and edge structure between described basic structural unit and edge member
The edge of a wing of part is connected with each other, and described end connecting node is bolt connection node, the end plate and edge structure of basic structural unit
It is bolted between part.
The steel truss support structure can make supporting construction in foundation ditch, under the effect of margin of foundation pit soil pressure, mainly
Bear the effect of moment of flexure.
Intermediate connecting node between the adjacent basic structural unit of the present invention is according to its bearing capacity and chord member axial carrying
The strong method such as ability determines, ensures the part of end plate by welding ribbed stiffener method in end plate and the chord member weld of chord member
Stability.
The chord member ala lateralis listrium of adjacent row truss structure is connected by bolt between single truss structural, formed
Multiple rows of truss structural.When multiple rows of truss is combined, the length between difference row's truss can also only be existed with identical
Moment of flexure large area uses multiple rows of truss.
The main Transfer of Shear of bolt connection between different row's truss structures in the present invention, the design of connection is according to shearing resistance
Bearing capacity is checked.
The edge member of the present invention can be connected with the other components of foundation ditch.
The physical dimension of the basic structural unit of the present invention, meeting that pit earthwork excavation construction needs and truss held by curved
Under conditions of carrying power, the conveyor width limit value of vehicle should be met.
The steel truss support structure of the present invention has excellent anti-bending strength, and internals is sparse, and structure type is simple, cloth
Put and supporting construction is used as in foundation ditch, the soil lateral pressure effect of resistance margin of foundation pit can be played.
The present invention is mainly assembled by some identical basic structural units, and both sides of the edge position respectively with side
Edge component is connected to form steel truss structure, realizes modularization, has the advantages that versatile, high recycling rate.And profit
The effect of margin of foundation pit earth lateral pressure is resisted with the good flexural capacity of truss structure, bending rigidity.
When using supporting construction of the bracing members as foundation ditch, for be positioned across foundation ditch opposite side two transverse brace structures it
Between, between stull and angle brace, between two angle braces and positioned at stull or angle brace and the margin of foundation pit of vertical direction it
Between flat segments for, existing structure often directly using purlin, using prestressing force domes and prestressing force fish-bellied type knot
Structure bears the effect of the soil pressure of margin of foundation pit (perpendicular to margin of foundation pit).In the presence of soil pressure, the branch of this position
Support structure is primarily subjected to the effect of moment of flexure.Because the anti-bending strength of purlin in itself is poor, thus it is straight when directly using purlin
The span on side must be sufficiently small.And prestressing force domes are because structure type is complex, its form and design parameter (such as across
Degree, rise etc.) correlation is big and closely related with the attachment structure at arch springing, therefore versatility is not strong, it is necessary to for difference
Situation design and make corresponding to structure.Prestressing force fish-bellied type structure is winded up cable wire by tensioning, by cable wire in fish belly
The thrust of column resists the effect of margin of foundation pit soil pressure, although higher due to that in theory can be obtained using strand spiral rope
Bending bearing capacity, but the deformation due to fish-bellied type structure and cable wire axis stiffness relevance are big, and generally in advance should
Power cable wire section it is smaller, therefore the bending rigidity of total is smaller, so its applicable span is relatively limited, and cable wire
Tensioning requires higher, and construction is complex.Steel truss is a kind of outstanding by kinking structure, is formed using the xial feed of chord member
Couple resist torque, while using the axially loaded resistance shearing of diagonal web member, there is bending rigidity is big, flexural capacity is high etc.
Feature, it is widely used in all kinds of structures by kinking.But in order to obtain excellent anti-bending strength, the usual section of truss structure
Size is larger, and this brings very big trouble to the transport and installation of the foundation pit steel support structure for needing to reuse.The present invention
Structure use modular mode, consider the width limitation of haulage vehicle, utilize identical basic structural unit and few
Edge member is measured, it is assembled by the bolt connection at scene, form truss structure.So both solve transport and installation question, again
The excellent flexural property of truss structure can be utilized, while truss can be adjusted according to the span of reality and the size of soil pressure
Row and arrangement, there is versatile, high recycling rate, the early stage of foundation pit steel support structure can be greatly reduced
Fund input.
The present invention has the advantage that compared with prior art：
1) splicing assembling, the composition truss knot that flexural capacity is big, bending rigidity is big are carried out using basic structural unit
Structure, the effect of margin of foundation pit soil pressure can be effective against.
2) basic structural unit form is simple, uniform specification, can avoid the diversity of component form and specification, versatility
By force, high recycling rate, a large amount of early investments of steel support structure can be greatly reduced, effectively reduce cost；
3) clear space inside the truss structure that composition is formed is big, is advantageous to the excavation construction of pit earthwork and other
Constructing operation；
4) size of basic structural unit meets transport vehicle transports width, can effectively improve conevying efficiency, reduces thing
Flow cost；
5) single or multiple rows of truss structure can be formed, meets different foundation ditch bearing requirements and span requirement, can root
Single or multiple rows of truss structure, strong applicability are formed according to the size of foundation ditch soil pressure and the span flexible assembling of truss.
For synthesis, the present invention has the loading characteristic that flexural capacity is big, bending rigidity is big, while has basic knot
Structure uniform specification, form are simple, are easy to the features such as transport and in-site installation.
Brief description of the drawings
Fig. 1 is the floor map of the modularization foundation ditch steel truss support structure (single) of the present invention.
Fig. 2 is the floor map of the modularization foundation ditch steel truss support structure (two rows) of the present invention.
Fig. 3 is the plan of basic structural unit.
Fig. 4 is the top view of basic structural unit.
Fig. 5 is the side view of basic structural unit.
Fig. 6 is the plan of edge member.
Fig. 7 is the side view of edge member.
Fig. 8 is the assembled schematic diagram of the modularization foundation ditch steel truss support structure of the present invention.
Fig. 9 builds the scheme of installation in foundation ditch for structure of the present invention.
In figure：Basic structural unit 1, edge member 2, intermediate connecting node 3, end connecting node 4, bolt 5, chord member 6,
End plate 61, ribbed stiffener 62, diagonal web member 7.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
As shown in figure 1, the present invention includes single or plurality of rows of truss structural, truss structural includes basic knot
Structure unit 1 and edge member 2, truss structural is mainly spliced by basic structural unit 1, positioned at truss structural
The basic structural unit of edges at two ends is connected with edge member 2, and edge member 2 is connected with foundation ditch supporting construction.
Truss structural is spliced to form by multiple basic structural units 1 along a row, two neighboring basic structural unit 1 it
Between connected by intermediate connecting node 3, the basic structural unit 1 at both ends passes through end connecting node 4 and edge member 2 after splicing
Connection.
As in Figure 3-5, basic structural unit 1 is made up of two diagonal web members 7 of chord member 6 and one, two 6 parallel cloth of chord member
Put, be connected to form one between two chord members 6 by diagonal web member 7, the both ends of diagonal web member 7 are connected by welding to the edge of a wing of chord member 6
On.
In basic structural unit 1, the both ends of two chord members 6 are respectively and fixedly provided with end plate 61, and diagonal web member 7 is located remotely from end plate 61
Side it is concordant with the edge of a wing of chord member 6, be connected with facilitating with purlin and the connection of multiple rows of truss structure, positioned at close on end plate 61
The side of diagonal web member 7 extends beyond the edge of a wing of chord member 6, and ribbed stiffener 62 is connected between extension and the edge of a wing of chord member 6,
So under soil pressure effect, moment of flexure can be transmitted during tension on the inside of chord member, basically reaches rigidly connected effect.
As shown in Figure 6 and Figure 7, in specific implementation, open up bolt hole on the end plate 61 at the both ends of chord member 6, each chord member 6 it is outer
Also bolt hole is opened up on side wing edge, bolt hole is opened up on the edge of a wing of edge member 2.
As shown in Fig. 2 multiple rows of truss structural is bolted by multiple single truss structurals, specifically
Connection between truss structural described in adjacent two row is to be connected with each other between the edge of a wing of both chord members 6 by bolt 5, most
After build as shown in Figure 8.
The phase of end plate 61 of both chord members is interconnected by intermediate connecting node 3 between two adjacent basic structural units 1
Connect, be bolted between the end plate 61 of two basic structural units 1 so that two strings in multiple basic structural units 1
Bar each connects with straight line.In specific implementation, the centre of two pieces of lower flange scopes on chord member of end plate 61 being connected
It is connected between section, and extends in two pieces of end plates being connected 61 and also to be connected with bolt between the extension outside chord member
Connect so that intermediate connecting node 3 forms unilateral extended end-plate connections.
By end connecting node 4 by the end plate 61 and edge member of chord member between basic structural unit 1 and edge member 2
2 are connected with each other, and end connecting node 4 is bolt connection node, lead between the end plate 61 and edge member 2 of basic structural unit 1
Cross bolt connection.In specific implementation, end plate 61 is located on chord member to be used between the interlude of lower flange scope and the edge of a wing of edge member 2
Bolt connection, and end plate 61 extends and is also connected between the extension outside chord member and the edge of a wing of edge member 2 so that in
Between connecting node 3 form asymmetric bolt connection node.
As can be seen here, the present invention resists margin of foundation pit using the good flexural capacity of truss structure, bending rigidity
The effect of earth lateral pressure.
Structure of the present invention to be built after being connected to foundation ditch, the edge of a wing of chord member 6 is connected by bolt with the purlin on foundation ditch periphery,
And the deadweight of supporting construction is born using bracket.
Basic structural unit unity of form wherein as basic module, can save substantial amounts of early investment；Elementary cell
For planar structure, and size meets the requirement of Automobile Transportation width, is advantageous to save logistics cost；Inside the truss structure of formation
Clear space it is big, be easy to pit earthwork excavate etc. construction operation；Can be according to the size of foundation ditch soil pressure and the span of truss
Flexible assembling forms single or multiple rows of truss structure, strong applicability.
The example of the present invention
It is H400x400x13x21 to take the section of elementary cell chord member and web member, and steel are Q345 (design strengths
295MPa), the overall length of elementary cell chord member is that the distance between 2400mm, the center line of two chord members is 3000mm, i.e. elementary cell
The housing size of structure is wide 2400mm, and high 3400mm, the soil pressure of margin of foundation pit is 150kN/m, and foundation ditch steel truss support is pressed
Calculated according to simply supported beam.
The result of calculation of table 1
From result of calculation, flexural capacity of the present invention is big, bending rigidity is big, is effective against margin of foundation pit soil pressure
Effect, meet different foundation ditch bearing requirements and span requirement, can be according to the size of foundation ditch soil pressure and the spirit of the span of truss
Assembling living forms single or multiple rows of truss structure, has prominent significant technique effect.
Claims (9)
- A kind of 1. modularization foundation ditch steel truss support structure, it is characterised in that：The steel truss support structure be by single or Plurality of rows of truss structural is formed, and truss structural includes basic structural unit (1) and edge member (2), plane girder Structure mainly be spliced by basic structural unit (1), positioned at truss structural edges at two ends basic structural unit with Edge member (2) connects.
- A kind of 2. modularization foundation ditch steel truss support structure according to claim 1, it is characterised in that：Described plane purlin Frame structure is spliced to form by multiple basic structural units (1) along a row, passes through centre between two neighboring basic structural unit (1) Connecting node (3) connects, after splicing the basic structural unit (1) at truss structural both ends by end connecting node (4) and Edge member (2) connects.
- A kind of 3. modularization foundation ditch steel truss support structure according to claim 1 or 2, it is characterised in that：Described base This construction unit (1) is made up of two chord members (6) and a diagonal web member (7), two chord members (6) parallel arrangement, two chord members (6) it Between be connected to form one by diagonal web member (7).
- A kind of 4. modularization foundation ditch steel truss support structure according to claim 3, it is characterised in that：In described basic structural unit (1), the both ends of two chord members (6) are respectively and fixedly provided with end plate (61), and end plate is located on (61) Side away from diagonal web member (7) is concordant with the edge of a wing of chord member (6), is located on end plate (61) and extends close to the side of diagonal web member (7) Go out the edge of a wing of chord member (6), and ribbed stiffener (62) is connected between extension and the edge of a wing of chord member (6).
- A kind of 5. modularization foundation ditch steel truss support structure according to claim 3, it is characterised in that：Connection between truss structural described in adjacent two row is by bolt (5) phase between both chord member (6) edges of a wing Connect.
- A kind of 6. modularization foundation ditch steel truss support structure according to claim 3, it is characterised in that：The edge of a wing of the chord member (6) is connected by bolt with the purlin on foundation ditch periphery, and is born by setting bracket from heavy burden Carry.
- A kind of 7. modularization foundation ditch steel truss support structure according to claim 3, it is characterised in that：It is by intermediate connecting node (3) that the end plate (61) of both chord members is mutual between two adjacent basic structural units (1) Connection, described intermediate connecting node (3) are bolt connection node, between the end plate (61) of two basic structural units (1) It is bolted.
- A kind of 8. modularization foundation ditch steel truss support structure according to claim 3, it is characterised in that：By end connecting node (4) by the end plate (61) of chord member between described basic structural unit (1) and edge member (2) It is connected with each other with edge member (2), described end connecting node (4) is bolt connection node, the end of basic structural unit (1) It is bolted between plate (61) and edge member (2).
- A kind of 9. application of any described modularization foundation ditch steel truss support structures of claim 1-8, it is characterised in that：It is described Steel truss support structure makees supporting construction in foundation ditch.
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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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710832630.9A CN107503358B (en) | 2017-09-15 | 2017-09-15 | Modularized foundation pit steel truss supporting structure |
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| CN107503358A true CN107503358A (en) | 2017-12-22 |
| CN107503358B CN107503358B (en) | 2023-08-01 |
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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 |
| CN113358470A (en) * | 2021-06-04 | 2021-09-07 | 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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| 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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| 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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| Publication number | Publication date |
|---|---|
| CN107503358B (en) | 2023-08-01 |
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