CN110424411A - A kind of irregular foundation pit assembled steel support device and its construction and application method - Google Patents

A kind of irregular foundation pit assembled steel support device and its construction and application method Download PDF

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Publication number
CN110424411A
CN110424411A CN201910792464.3A CN201910792464A CN110424411A CN 110424411 A CN110424411 A CN 110424411A CN 201910792464 A CN201910792464 A CN 201910792464A CN 110424411 A CN110424411 A CN 110424411A
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China
Prior art keywords
steel
support
foundation pit
assembled
construction
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CN201910792464.3A
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Chinese (zh)
Inventor
赵升峰
陈祉阳
黄莹
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Nanjing Surveying And Mapping Investigation And Research Institute Ltd By Share Ltd
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Nanjing Surveying And Mapping Investigation And Research Institute Ltd By Share Ltd
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Priority to CN201910792464.3A priority Critical patent/CN110424411A/en
Publication of CN110424411A publication Critical patent/CN110424411A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits

Abstract

The invention discloses a kind of irregular foundation pit assembled steel support device and its construction and application method, the irregular foundation pit refers to foundation pit sideline in irregular polygon shape;The reinforced concrete frame structure uses armored concrete rood beam and armoured concrete slab in length and breadth, forms the biggish support construction of closed rigidity;The irregular foundation pit seals rectangular regular foundation pit by reinforced concrete girder slab frame structure;The assembled steel support uses H profile steel or steel pipe;Steel angle brace and steel are arranged to support in the regular foundation pit that the bracing members are formed;The steel connects into whole steel support structure by H profile steel lateral ties bar to support;The steel angle brace connects into whole bracing members by the oblique connection bar of H profile steel;The vertically arranged steel column of bracing members;The bracing members are linked together by steel triangle gridding part and support pile crown beam or purlin.The entire duration of a project of the embodiment of the present invention is short, and construction site is spacious, and transport of materials and stacking are convenient, better assures that construction efficiency and safety, while achieving the purpose that saving construction cost.

Description

A kind of irregular foundation pit assembled steel support device and its construction and application method
Technical field
The present invention relates to underground space development midfield foundation pit, there are the foundation pit supporting project fields of irregular area, specifically For a kind of assembled steel support device and its construction and application method applied to Underground Space Excavation irregular foundation pit support engineering.
Background technique
With the development of urban construction, usable land is fewer and fewer in urban district, and construction site condition is also worse and worse.Underground The hair in space is opened, and needs to carry out in the place of irregular, therefore there are problems that irregular foundation pit excavation complex-shaped. Irregular foundation pit stress is complicated, and inner support setting is difficult, especially the application of assembled steel support, is restricted, because of steel branch It is horizontal to support, balance and stress simple to support force request.Therefore, it is necessary to one kind to be arranged assembled steel support in irregular foundation pit Method solve the above problems.
The patent document of Publication No. CN101666095A discloses a kind of irregular foundation pit construction method, it is characterized in that Arched girder is arranged in such a way that grit branch withstands on arched girder in inner support inside irregular foundation pit, and rood beam is arranged in arched girder Reinforce lateral stiffness.The inventive structure form is succinct, and clear by power path, project cost is low, easy for construction, and supporting construction becomes Shape is small.But still have the following disadvantages: that (1) inner support of the present invention is adopted all using beams of concrete, for large-area deep foundation pit, coagulation Native large area concrete inner support speed of application is slow, and curing time is long, causes the duration of a project too long;(2) it is taken in foundation pit big Mass concrete inner support, the later period removes difficulty, while will cause dust pollution and a large amount of concrete debris, pollutes environment. (3) inner support can not reuse, uneconomical.
The patent document of Publication No. CN104790408A discloses a kind of irregular foundation pit construction method, it is characterized in that foundation pit Capping beam uses Two bors d's oeuveres channel steel, and support pile takes three axes agitating pile interpolation fashioned iron mode, and anchor pole, anchor pole insertion are arranged on the outside of foundation pit Margin of foundation pit foundation soil length is 14 ~ 20m, and this method avoid inner support is arranged inside foundation pit.But still deposit following disadvantage: (1) The present invention uses the form of anchor pole earth-retaining, is bound to so that anchor pole surmounts land red-line, leaves the barrier that can not be extracted to outer ground is cheated Hinder, seriously affects the construction of successive projects;(2) for soft soils such as mud and Muddy Bottoms, using suspension roof support, because of anchor pole side Resistance is too small, causes foundation pit deformation excessive, influences the safety of foundation pit environment.
Summary of the invention
In order to solve above-mentioned the deficiencies in the prior art, irregular foundation pit is subjected to rule the present invention provides a kind of Change processing, so that the entire duration of a project is short, construction site is spacious, and transport of materials and stacking are convenient, better assures that construction effect Rate and safety, while achieving the purpose that a kind of irregular foundation pit assembled steel support device and its construction application side of saving construction cost Method.
The object of the present invention is achieved like this:
A kind of irregular foundation pit assembled steel support device, including for not advised with what is handled using reinforced concrete frame structure Then regional processing structure, and the foundation pit assembled steel support being arranged in irregular area processing structure;
The irregular area processing structure is reinforced concrete frame structure, and the reinforced concrete frame structure uses steel Reinforced concrete rood beam and armoured concrete slab 2 in length and breadth, form the biggish support construction of closed rigidity;The reinforced concrete Rood beam includes that reinforced concrete girder slab frame 1 and reinforced concrete girder slab frame 1 are attached fixed formation to soil in length and breadth Irregular foundation pit is then sealed rectangular regular foundation pit by structure;
The foundation pit assembled steel support includes assembled steel to support structure and assembled steel gusset form;
Described matches formula steel to support structure, is arranged in foundation pit middle position, including steel column 8, the assembled connecting with steel column 8 Steel contacts bar 4 to support, and the assembled steel fixes support connection bar 4 and assembled steel to support;
The assembled steel is H profile steel or steel pipe to support connection bar 4;
Four corners of foundation pit, including steel column are arranged in the assembled steel gusset form, are connected and fixed with steel column Assembled steel angle brace H profile steel lateral ties bar 6, and the assembly being connected and fixed with assembled steel angle brace H profile steel lateral ties bar 6 Formula steel angle brace 5;The both ends of the assembled steel angle brace 5 are provided with steel triangle gridding part 7;The steel triangle gridding part 7 by Multiple equilateral triangle grids 701 form;Bracing members are linked together by steel triangle gridding part and support pile crown beam or purlin;
The steel column 8 is rectangular to be welded using 4 additional steel batten plates 801 of L140 L160 equal leg angle 802 Lattice column, bottom are provided with stand column pile 803;
The assembled steel holds up case 401 to the lower end setting box of support connection bar 4, is connected by high-strength bolt;Described Box holds up the side of case 401 and steel column uses while welding, using no less than 4 high-strength bolts connections;
A kind of application construction method of the irregular foundation pit assembled steel support device, comprising the following steps:
Step 1: carrying out section partition according to the sideline of base pit engineering, the form of each section of support pile and water-seal pile is determined, then Carry out the construction of support pile and water-seal pile;
Step 2: finishing to support pile and sealing pile driving construction, reinforced concrete is arranged according to the size of foundation pit irregular area area The position of native Vierendeel girder 1 and span, and armoured concrete slab 2 is arranged according to the requirement of later period trestle preloading;
Step 3: construct steel column 8 and stand column pile 803, wherein stand column pile uses after rc-frame-beam position determines Cast-in-situ bored pile, stake is long to be determined according to load, and steel column uses 4 additional steel batten plates 801 of L140 L160 equal leg angle 802 The rectangular lattice column being welded;
Step 4: finishing to steel column construction, according to design requirement, assembled steel Construction of Supporting is carried out;Assembled is carried out first Construction of the steel to support connection bar 4;Steel holds up case 401 to support H profile steel lateral ties bar lower end setting box;Box holds up the one of case While side and steel column are using welding, connected using high-strength bolt;Box holds up case upper end and passes through with H profile steel lateral ties bar While welding, connected using high-strength bolt;
Step 5: then carrying out erection of the assembled steel to support 3 to the end of steel is to the construction of support H profile steel lateral ties bar, carrying out Splicing installation wherein every two H profile steels pass through solder design to the splicing of support, while being respectively set in H profile steel web two sides and adding Strong steel plate 301 will reinforce steel plate by high-strength bolt 302 and connect with H profile steel;Steel is lateral with H profile steel by welding to support lower end While contacting bar connection, connected using high-strength bolt;
Step 6: carrying out assembled angle brace 5 and assembled steel after assembled steel constructs to support and H profile steel lateral ties bar Angle brace H profile steel lateral ties bar 6 is constructed;Wherein construction method and assembled steel are to the construction party supportted with H profile steel lateral ties bar Method is consistent;
Step 7: the connection with crown beam or purlin is carried out after formula steel to be assembled is to support and assembled steel angle brace erection construction, Wherein the two is connect by steel triangle gridding part 7 with crown beam and purlin;Steel is to support and steel angle brace by welding and reinforcing steel plate Mode connect with steel triangle gridding part;The steel triangle gridding part other end is connect by pre-embedded steel slab with crown beam and purlin;
Step 8: earth excavation and precipitation of base pit engineering etc. are consistent with traditional foundation ditch construction method;Subsequent all inner supports Construction method is identical as first layer inner support method.
Positive beneficial effect: the present invention is solved irregular deep basal pit and is asked using the existing setting difficulty of assembled steel support Topic realizes the purpose of base pit engineering construction quickly, environmentally friendly;Deep basal pit region irregular for every side is small-scale to take steel Tendon concrete frame structure can not only make assembled steel support setting area formation rule rectangle, and frame concrete Region can be used as small-sized trestle and use, i.e., stackable construction utensil etc.;After reinforced concrete frame structure deburring, formation Horizontal direction assembled steel support construction is set in regular Foundation Pit, not only saves support cost, but also facilitate high building pit earthwork It excavates, saves the duration;After reinforced concrete frame structure deburring, supporting construction corner stress concentration or office are avoided Region deformation prominent phenomenon in portion's reduces Excavation Process Supporting Structure deformation, and the regular foundation pit formed ensure that supporting The uniformity of malformation;It is supported by large area in foundation pit using assembled steel, later period dismountable reuse has reached section The requirement of energy environmental protection and green construction, can use in urban district;It is irregular that the present invention not only solves foundation pit sideline, assembled steel The difficult problem of support setting, and provide a kind of construction of large-area deep foundation pit method.This method is simple and easy, process conversion It is connected simple and reliable, the flowing of construction personnel can be reduced to the maximum extent, effectively improve working efficiency, there is essence outstanding Property feature and marked improvement.
Detailed description of the invention
Fig. 1 is a kind of irregular foundation pit assembled steel support applications method floor map of the present invention;
Fig. 2 is concrete frame beam sectional schematic diagram;
Fig. 3 is that assembled steel supports connection schematic diagram;
Fig. 4 is that H profile steel lateral ties bar and assembled steel support connection schematic diagram;
Fig. 5 is steel lattice column schematic diagram;
Fig. 6 is steel triangle gridding part cross-sectional view.
In figure are as follows: rc-frame-beam 1, armoured concrete slab 2, assembled steel are to support 3, assembled steel to support H-type Steel lateral ties bar 4, assembled steel angle brace 5, assembled steel angle brace H profile steel lateral ties bar 6, steel triangle gridding part 7, steel column 8。
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention is described further:
As shown in figures 1 to 6, a kind of irregular foundation pit assembled steel support device, including it is used for and uses reinforced concrete frame knot The irregular area processing structure of structure processing, and the foundation pit assembled steel support being arranged in irregular area processing structure;
The irregular area processing structure is reinforced concrete frame structure, and the reinforced concrete frame structure uses steel Reinforced concrete rood beam and armoured concrete slab 2 in length and breadth, form the biggish support construction of closed rigidity;The reinforced concrete Rood beam includes that reinforced concrete girder slab frame 1 and reinforced concrete girder slab frame 1 are attached fixed formation to soil in length and breadth Irregular foundation pit is then sealed rectangular regular foundation pit by structure;
The foundation pit assembled steel support includes assembled steel to support structure and assembled steel gusset form;
Described matches formula steel to support structure, is arranged in foundation pit middle position, including steel column 8, the assembled connecting with steel column 8 Steel contacts bar 4 to support, and the assembled steel fixes support connection bar 4 and assembled steel to support;
The assembled steel is H profile steel or steel pipe to support connection bar 4;
Four corners of foundation pit, including steel column are arranged in the assembled steel gusset form, are connected and fixed with steel column Assembled steel angle brace H profile steel lateral ties bar 6, and the assembly being connected and fixed with assembled steel angle brace H profile steel lateral ties bar 6 Formula steel angle brace 5;The both ends of the assembled steel angle brace 5 are provided with steel triangle gridding part 7;The steel triangle gridding part 7 by Multiple equilateral triangle grids 701 form;Bracing members are linked together by steel triangle gridding part and support pile crown beam or purlin;
The steel column 8 is rectangular to be welded using 4 additional steel batten plates 801 of L140 L160 equal leg angle 802 Lattice column, bottom are provided with stand column pile 803;
The assembled steel holds up case 401 to the lower end setting box of support connection bar 4, is connected by high-strength bolt;Described Box holds up the side of case 401 and steel column uses while welding, using no less than 4 high-strength bolts connections.
Embodiment
By taking the G20 project of certain city as an example, which belongs to large-area deep foundation pit, and basement outer edge irregular is formed Irregular deep basal pit.In order to meet the requirement of environmental protection and duration, deep basal pit inner support region of disorder uses reinforced concrete frame, The form for taking assembled steel to support after processing, the Specific construction step of the foundation pit are as follows:
Firstly, according to the sideline of base pit engineering carry out section partition, determine the form of each section of support pile and water-seal pile, then into The construction of row support pile and water-seal pile.It is finished to support pile and sealing pile driving construction, according to the size of foundation pit irregular area area Position and the span of rc-frame-beam 1 are set, it is ensured that the spacing of rc-frame-beam be not more than 9.0m, and according to Armoured concrete slab 2 is arranged in the requirement of later period trestle preloading, it is ensured that its thickness is not less than 250mm.To rc-frame-beam After position determines, construct steel column 8 and stand column pile 803, wherein stand column pile uses cast-in-situ bored pile, and stake diameter is not less than 800mm, stake Side long to be determined according to load, that steel column uses 4 additional steel batten plates 801 of L140 L160 equal leg angle 802 to be welded Shape lattice column.
It is finished to steel column construction, according to design requirement, carries out assembled steel Construction of Supporting.Assembled steel pair is carried out first Support the construction of H profile steel lateral ties bar 4.Steel holds up case 401 to support H profile steel lateral ties bar lower end setting box.Box is held up 3 blocks of steel plates of case use -400 × 400 × 20 are welded, and box holds up the side of case and steel column uses while welding, Using no less than 4 28 high-strength bolts connections.While box picking-up case upper end and H profile steel lateral ties bar pass through welding, adopt With no less than 2 28 high-strength bolts connections.
To the end of steel is to the construction of support H profile steel lateral ties bar, erection of the assembled steel to support 3 is then carried out, steel is to support Using the fashioned iron of H350 × 350, length uses this 3 kinds of moduluses of 9m, 1m and 2m, splicing installation is carried out, wherein every two H profile steels are to support Splicing by solder design, while one piece -700 × 300 × 20 of reinforcement steel plate 301 is respectively set in H profile steel web two sides, By 28 high-strength bolt 302, steel plate will be reinforced and connect with H profile steel.Steel passes through welding and H profile steel lateral ties to support lower end While bar connects, using no less than 2 28 high-strength bolts connections.
After assembled steel constructs to support and H profile steel lateral ties bar, carries out assembled angle brace 5 and H profile steel angle brace is horizontal It constructs to connection bar 6.Wherein construction method is consistent with the construction method of H profile steel lateral ties bar to supportting with assembled steel.
After formula steel to be assembled is to support and assembled steel angle brace erection construction, the connection with crown beam or purlin is carried out, It is both middle to be connect by steel triangle part 7 with crown beam and purlin.Steel is to support and steel angle brace by way of welding and reinforcing steel plate It is connect with steel triangle part.The steel triangle part other end is connect by pre-embedded steel slab with crown beam and purlin.
Earth excavation and precipitation of base pit engineering etc. are consistent with traditional foundation ditch construction method;The construction of subsequent all inner supports Method is identical as first layer inner support method.
The present invention solves irregular deep basal pit and difficult problem is arranged using assembled steel support is existing, realizes foundation pit The purpose of engineering construction quickly, environmentally friendly;Deep basal pit region irregular for every side is small-scale to take reinforced concrete frame Structure, can not only make assembled steel support setting area formation rule rectangle, and frame concrete region can be used as it is small Type trestle uses, i.e., stackable construction utensil etc.;After reinforced concrete frame structure deburring, in the regular Foundation Pit of formation Horizontal direction assembled steel support construction is set, not only saves support cost, but also high building pit earthwork is facilitated to excavate, saves work Phase;After reinforced concrete frame structure deburring, avoids supporting construction corner stress concentration or regional area deformation is prominent Out the phenomenon that, reduces Excavation Process Supporting Structure deformation, and the regular foundation pit formed ensure that the equal of Supporting Structure deformation Even property;It is supported by large area in foundation pit using assembled steel, later period dismountable reuse has reached energy conservation and environmental protection and green The requirement of construction can use in urban district;It is irregular that the present invention not only solves foundation pit sideline, and assembled steel support setting is difficult The problem of, and provide a kind of construction of large-area deep foundation pit method.This method is simple and easy, and process conversion linking simply may be used It leans on, the flowing of construction personnel can be reduced to the maximum extent, effectively improve working efficiency, there are substantive distinguishing features outstanding and show Write progress.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.

Claims (9)

1. a kind of irregular foundation pit assembled steel support device, it is characterised in that: including being used for and using reinforced concrete frame The irregular area processing structure of pattern handling, and the foundation pit assembled steel branch being arranged in irregular area processing structure Support.
2. a kind of irregular foundation pit assembled steel support device according to claim 1, it is characterised in that: described does not advise Then regional processing structure is reinforced concrete frame structure, and the reinforced concrete frame structure is using armored concrete in length and breadth ten Word beam and armoured concrete slab form the biggish support construction of closed rigidity;Armored concrete rood beam packet in length and breadth It includes reinforced concrete girder slab frame and reinforced concrete girder slab frame is attached the fixed structure formed for irregular foundation pit Then seal rectangular regular foundation pit.
3. a kind of irregular foundation pit assembled steel support device according to claim 1, it is characterised in that: the foundation pit Assembled steel support includes assembled steel to support structure and assembled steel gusset form.
4. a kind of irregular foundation pit assembled steel support device according to claim 3, it is characterised in that: described matches formula Support structure is arranged in foundation pit middle position, including steel column, the assembled steel connecting with steel column contacts bar to support, institute in steel The assembled steel stated fixes support connection bar and assembled steel to support.
5. a kind of irregular foundation pit assembled steel support device according to claim 4, it is characterised in that: the assembled Steel is H profile steel or steel pipe to support connection bar.
6. a kind of irregular foundation pit assembled steel support device according to claim 3, it is characterised in that: the assembly Four corners of foundation pit, including steel column are arranged in formula steel gusset form, the assembled steel angle brace H-type being connected and fixed with steel column Steel lateral ties bar, and the assembled steel angle brace being connected and fixed with assembled steel angle brace H profile steel lateral ties bar;The dress Both ends with formula steel angle brace are provided with steel triangle gridding part;The steel triangle gridding part is made of multiple equilateral triangle grids; Bracing members are linked together by steel triangle gridding part and support pile crown beam or purlin.
7. a kind of irregular foundation pit assembled steel support device according to claim 4, it is characterised in that: the steel is vertical Column is the rectangular lattice column being welded using the additional steel batten plate of 4 L140 L160 equal leg angles, and bottom is provided with column Stake.
8. a kind of irregular foundation pit assembled steel support device according to claim 7, it is characterised in that: the assembly Formula steel holds up case to the lower end setting box of support connection bar, is connected by high-strength bolt;The box hold up the side of case with While steel column is using welding, using no less than 4 high-strength bolt connections.
9. a kind of application construction method of irregular foundation pit assembled steel support device as described in claim 1 and, feature It is, comprising the following steps:
Step 1: carrying out section partition according to the sideline of base pit engineering, the form of each section of support pile and water-seal pile is determined, then Carry out the construction of support pile and water-seal pile;
Step 2: finishing to support pile and sealing pile driving construction, reinforced concrete is arranged according to the size of foundation pit irregular area area The position of native Vierendeel girder and span, and armoured concrete slab is arranged according to the requirement of later period trestle preloading;
Step 3: construct steel column and stand column pile, wherein stand column pile is using drilling after rc-frame-beam position determines Bored concrete pile, stake is long to be determined according to load, what steel column was welded using the additional steel batten plate of 4 L140 L160 equal leg angles Rectangular lattice column;
Step 4: finishing to steel column construction, according to design requirement, assembled steel Construction of Supporting is carried out;Assembled is carried out first Construction of the steel to support connection bar;Steel holds up case to support H profile steel lateral ties bar lower end setting box;Box hold up case side with While steel column is using welding, connected using high-strength bolt;Box holds up case upper end and H profile steel lateral ties bar passes through welding While, it is connected using high-strength bolt;
Step 5: then carrying out erection of the assembled steel to support to the end of steel is to the construction of support H profile steel lateral ties bar, carrying out Splicing installation wherein every two H profile steels pass through solder design to the splicing of support, while being respectively set in H profile steel web two sides and adding Strong steel plate will reinforce steel plate by high-strength bolt and connect with H profile steel;Steel passes through welding and H profile steel lateral ties bar to support lower end While connection, connected using high-strength bolt;
Step 6: carrying out assembled angle brace and assembled steel angle after assembled steel constructs to support and H profile steel lateral ties bar Support the construction of H profile steel lateral ties bar;Wherein construction method and assembled steel are to the construction method one supportted with H profile steel lateral ties bar It causes;
Step 7: the connection with crown beam or purlin is carried out after formula steel to be assembled is to support and assembled steel angle brace erection construction, Wherein the two is connect by steel triangle gridding part with crown beam and purlin;Steel is to support and steel angle brace by welding and reinforcing steel plate Mode is connect with steel triangle gridding part;The steel triangle gridding part other end is connect by pre-embedded steel slab with crown beam and purlin;
Step 8: earth excavation and precipitation of base pit engineering etc. are consistent with traditional foundation ditch construction method;Subsequent all inner supports Construction method is identical as first layer inner support method.
CN201910792464.3A 2019-08-27 2019-08-27 A kind of irregular foundation pit assembled steel support device and its construction and application method Pending CN110424411A (en)

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CN201910792464.3A CN110424411A (en) 2019-08-27 2019-08-27 A kind of irregular foundation pit assembled steel support device and its construction and application method

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Application Number Priority Date Filing Date Title
CN201910792464.3A CN110424411A (en) 2019-08-27 2019-08-27 A kind of irregular foundation pit assembled steel support device and its construction and application method

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112681331A (en) * 2020-12-03 2021-04-20 中国建筑第八工程局有限公司 Steel support and steel trestle integrated structure and construction method thereof
CN113136873A (en) * 2021-04-16 2021-07-20 南通大学 Out-pit diagonal-pulling type supporting structure system and construction method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112681331A (en) * 2020-12-03 2021-04-20 中国建筑第八工程局有限公司 Steel support and steel trestle integrated structure and construction method thereof
CN113136873A (en) * 2021-04-16 2021-07-20 南通大学 Out-pit diagonal-pulling type supporting structure system and construction method thereof

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