CN102286980A - Steel truss foundation pit supporting structure - Google Patents

Steel truss foundation pit supporting structure Download PDF

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Publication number
CN102286980A
CN102286980A CN2011101928112A CN201110192811A CN102286980A CN 102286980 A CN102286980 A CN 102286980A CN 2011101928112 A CN2011101928112 A CN 2011101928112A CN 201110192811 A CN201110192811 A CN 201110192811A CN 102286980 A CN102286980 A CN 102286980A
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truss
steel
steel truss
supporting
foundation pit
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CN2011101928112A
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CN102286980B (en
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简洪钰
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FJUT CONSTRUCTION DESIGN INSTITUTE
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FJUT CONSTRUCTION DESIGN INSTITUTE
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Abstract

The invention discloses a steel truss foundation pit supporting structure, which comprises a plurality of steel truss guard posts, wherein every two adjacent steel truss guard posts are connected with each other through a breast board between the piles to form a supporting piling wall; each steel truss guard post is a square space truss; each square space truss comprises four steel pipes; on two opposite side faces formed by the four steel pipes, a truss is formed by fixed web members welded on the steel pipes; detachable web members are distributed on the other two opposite side faces; and truss nodes on the two earth-retaining side faces of the truss formed by the fixed web members are connected with load conversion plates through bolts. In the invention, pile sinking and pulling construction can be performed according to the characteristic that a middle-high frequency vibration hammer can be used for hoisting a sunk pile and a pulled pile, so that the construction is flexible and mechanical; the steel truss guard piles and guard supporting members can be combined optionally according to the stress requirement, and relevant members can be processed into standard members, so that the assembling flexibility is achieved; and all members can be recycled, so that the national strategy requirements of environmental protection and energy conservation are met.

Description

Steel truss formula foundation pit supporting construction
[technical field]
The present invention relates to the provisional pattern foundation pit supporting structure in industry and the civilian construction field, be specially adapted to solve the pattern foundation pit supporting structure problem that mudflow sand may occur flowing.
[background technology]
When under the soil layer condition, excavating underground thing construction space one foundation ditch, its sidewall is very easy to collapse in the hole, the necessary interim ruggedized construction of construction just can guarantee foundation ditch and underground thing construction safety and the foundation ditch safety of existing building all around in order to retaining support.
The deep foundation pit support engineering is a kind of special engineering structure, and it has complexity, changeability and provisional characteristics.At present, the supporting and protection structure pattern of China mainly contains barricade and support (native anchor) two parts.Support form is divided into a reinforcement type supporting and retaining type supporting two a big class.
One, props up at present commonly used steel sheet pile supporting, bored pile barricade, diaphragm wall supporting are arranged, the supporting several patterns such as row of piles supporting in having of retaining type supporting, and in these support systems, often be aided with the sealing antiseepage, support technical measures such as drawing anchor, precipitation draining, shoveling unloading, make supporting scheme reach the effect of retaining soil, sealing.
1, steel sheet pile supporting
The steel sheet pile supporting is applicable to the foundation ditch of 5m~10m because speed of application is fast, reusable.But Larsen formula (U) type that adopts and I-shaped shaped steel are also spread the support form that blocks water with agitation pile at present, its support stiffness is less, often needs multiple tracks to support, and has a strong impact on the soil excavation of foundation ditch, the big sealing of foundation pit deformation is not ideal enough, and the excavation of foundation pit duration is long.
2, bored pile barricade
Dust head Φ 600mm~Φ 1000mm makes the campshed barricade, top concreting Guan Liang, and it has characteristics such as rigidity is big, bending resistance is strong, distortion is less relatively.Because leave the gap of 100mm~300mm between the stake, the dash weak effect need be used in combination with deep mixing cement pile.
3, diaphragm wall
Diaphragm wall is as one of main supporting and protection structure of deep foundation ditch, and usual thickness is 500mm~800mm.Diaphragm wall integrates retaining soil, intercepts water, anti-blend stressed.Be a kind of effectively pattern foundation pit supporting structure mode, but need special-purpose machines and tools equipment, the mechanization degree height, the cost height, its employing should combine the back with inner liner and use as the works exterior wall, can reduce the cost of supporting and protection structure.
Two, reinforcement type supporting
Deep-cement agitation pile or rotary churning pile etc. are adopted in the reinforcement type supporting more, not only can keep off soil but also can form water seal curtain, have been used for 7m with interior dark pattern foundation pit supporting structure at present, and it is applicable to soft foundation.But construction quality is difficult to control, and stagnant water effect is not ideal enough, and foundation pit deformation is bigger.
Existing support construction worker method patent is: " LXK worker's method " cantilevered cement-soil reinforcement supporting and protection structure (patent No.: ZL95117076.7), but its worker's method remains the combination of some worker's methods in the past, have some problems of above supporting type equally, effect is unsatisfactory.The tall ancestor of Shanghai Tunnel Engineering Railway Transportation Design Institute is clear, turn round and look at and hear and He Chunning has proposed the supporting method (patent No. ZL 03231835.9) that steel pipe pile solid matter structure adds the joggle waterproof, its method only is the change of connection and support material, and its structure stress there is no substantial change.Also need adopt the cement mixing pile sealing though its steel are also recyclable, the ratio of rigidity of opposing horizontal force is relatively poor, therefore more horizontal support need be set, and material therefor also is easy to distortion, restricted application.
In sum, all the other all must waste a large amount of resources except that the steel sheet pile supporting with regard to present existing foundation pit supporting construction form, according to the computational analysis of relevant works, a medium two-layer basement foundation ditch support engineering will be wasted more than the steel 100t concrete 2000m at least in the coastal area 3More than, waste surprising.The most economic at present steel sheet pile is the good measures of preventing water of neither one also, and owing to be subjected to the restriction of shaped steel size and construction equipment, this support form needs the multiple tracks horizontal support, and foundation pit deformation is big, and operation is more, and hidden dangers in project is many.Base pit engineering is an engineering that risk is bigger, owing to up to the present also do not have a kind of desirable foundation pit supporting construction form, therefore engineering accident often occurs, causes urban pipe network to destroy and the cracking of adjacent structure and differential settlement etc.
In view of this, the inventor is many at prior art waste of material, operation, the defective further investigation of difficult quality control, long construction period, and this case generation is just arranged.
[summary of the invention]
Technical problem to be solved by this invention is to provide the steel truss formula foundation pit supporting construction of a kind of environmental protection joint source, easy construction, and this supporting and protection structure makes fender post and go along with sb. to guard him the standardization and the assemblingization of supporting member, and reusable.
The present invention solves the problems of the technologies described above by the following technical solutions:
Steel truss formula foundation pit supporting construction comprises a plurality of steel truss formula fender posts, is connected to form the supporting piling wall by breast boards between stake between every adjacent two steel truss formula fender posts; The described steel truss formula fender post space truss that is square, this square space truss comprises four steel pipes, and two relative sides that these four steel pipes form form truss by the fixedly web member that is welded on the steel pipe, and other two relative sides are distributed with detachable web member; Be connected with the load change-over panel by bolt on the panel point of two native sides of retaining of the truss that described fixedly web member forms.
Any two node location places of described steel truss formula fender post middle top can connect a space plane truss as Guan Liang or enclose purlin.
Described steel truss formula fender post is positioned at foundation ditch bottommost place and also connects shoe.
The invention has the advantages that: the characteristics of utilizing the medium-high frequency vibrating hammer can suspend pile sinking and pile pulling in midair are sunk pile pulling construction, and it is flexible therefore to construct; Medium-high frequency vibration is dissipated fast little to the vibration effect of peripheral construction of structures, can construct in the intensive city of building; Steel truss formula fender post and go along with sb. to guard him supporting member and can make up arbitrarily according to force request, relevant member can be processed into standard component, and assembling is flexibly; Recyclable recycling behind all member workers meets the strategic requirement in national environmental protection joint source.
[description of drawings]
The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is steel truss formula fender post of the present invention is connected to form support wall by breast boards between stake a vertical view.
Fig. 2 is the steel truss formula fender post foundation pit supporting construction of the present invention side sectional view parallel with body of wall.
Fig. 3 is the structural profile schematic diagram of steel truss formula fender post excavation of foundation pit back wall one side of the present invention.
Fig. 4 be in the steel truss formula fender post of the present invention the load change-over panel with the stake between breast boards be connected vertical view.
[specific embodiment]
As shown in Figure 1, steel truss formula foundation pit supporting construction comprises a plurality of steel truss formula fender posts 10, is connected to form the supporting piling wall by breast boards between stake 20 between every adjacent two steel truss formula fender posts 10; Steel truss formula fender post 10 space truss that is square, this square space truss comprises four steel pipes 11, two relative sides (near the foundation ditch body of wall) that these four steel pipes 11 form are distributed with fixedly boom 12, and other two relative sides are distributed with detachable web member 13; Being distributed with fixedly, the side of boom 12 (near the foundation ditch body of wall) is connected with load change-over panel 14 by bolt.
As shown in Figure 2, steel truss formula fender post 10 is near the structural representation of foundation ditch body of wall one side.Horizontal from top to bottom, the tilting interval of the fixedly boom 12 that distributes on it is provided with.As shown in Figure 3, the detachable web member 13 of all the other two sides distributions also is that horizontal from top to bottom, tilting interval is provided with.Detachable web member 13 is connected on the steel pipe 11 by bolt, can dismantle.The adjustable length of detachable web member 13 can be regulated the thickness of support wall according to the length of regulating detachable web member 13 like this.Steel truss formula fender post 10 by the foundation ditch side can with is connected a space plane truss 40 as the Guan Liang of the space enclosing structure of foundation ditch or enclose purlin and resist the ability of horizontal movement to increase the truss stake.
Steel truss formula fender post 10 can be realized spreading by flange, and need be than higher support wall the time, steel truss formula fender post can a plurality ofly be arranged from top to bottom, between connect by flange.
The bottommost of steel truss formula fender post 10 connects a shoe 30 by bolt.The connecting elements influence that deforms was reused when the square space truss was met obstruction when shoe 30 being set can avoiding piling construction, and the penetration capacity in the time of can strengthening pile sinking simultaneously also alleviates soil compaction effect.
As shown in Figure 4, load change-over panel 14 is connected with hold-down nut on being fixed on fixing truss 12 nodes by bolt, it mainly acts on is retaining soil, sealing, also play simultaneously and convert main passive soil compressive stress to act on the point load on the node effect by area load, to satisfy each rod member of truss is the force request of two power bars, and this also is the key point that truss can be used as foundation pit supporting pile.The member that load change-over panel 14 can adopt steel plate to be welded and also can to adopt steel and other light materials to combine, but its function must guarantee to realize keeping off the requirement of soil, sealing and load conversion.
Steel truss is finished the space truss that is connected back formation with load change-over panel 14 and shoe 30, as shown in Figure 2, this truss top is connected by the clamper of dismountable clamper junction plate 50 with hydraulic vibration driver or other pile vibrosinking equipment, the truss stake is drowned into the degree of depth of designing requirement by vibration, can at first carry out the piling construction of test pile during construction, so that in time obtain the earth pressue at rest of a soil layer, and analyze the stressing conditions of truss with this, and then adjust design, realize information-based design and construction.
Breast boards 20 is connected with the notch of load change-over panel 14 both sides by the snap close tenon of its both sides between stake, snap close tenon structure of the present invention is not limited to form drawn among the figure, cloudy fore shaft can use the tubing in arbitrary shape cross sections such as round steel pipe or rectangular steel tube, the sun fore shaft also can use the section bar of arbitrary form, such as: angle steel, steel pipe or T-steel etc.Breast boards 20 can adopt steel plate to add vertical stiffeners to be welded, also can to adopt the truss of adjustable width and light material to combine between stake, also can conveniently vibrate and sinks in the soil as long as can accomplish to keep off native sealing.Breast boards 20 should be treated to be inserted into design elevation by the notch that vibrates along its load change-over panel both sides after the construction of square space truss sunk pile is finished between stake, can insert at active region and also can insert, as keep off native sealing and need also can all insert breast boards at main passive area at passive area.
The present invention determines the specification and the length of each member by designing unit according to the place geological conditions and the excavation of foundation pit degree of depth in practice, and required member statistics back is dispatched into the job site by factory process.Operation is as follows during construction:
According to the position → on-site consolidation truss stake of designing requirement excavation gathering sill and the accurately square truss stake in location and with the load change-over panel, clamper junction plate and stake footwear and truss stake are connected to form integral body → vibration and sink to truss stake → vibration and sink to breast boards between stake → according to designing requirement truss-like support Guan Liang → excavation is installed to cheat between the interior soil body → basement bottom board construction → outer wall of basement construction → external wall waterproof construction → exterior wall and the fender post backfill construction → vibration and extract between stake breast boards → vibration and extract truss stake → the remove load plate in the truss stake, the stake footwear, web member etc. → the entrucking that removably connects is cut to, and begins the construction of next pattern foundation pit supporting structure.
The needed main equipment of pattern foundation pit supporting structure of the present invention is vibrating hammer and large tonnage crawler type band car, and all the other are small-sized construction equipment, and are easy and simple to handle, and quick construction is disturbed less, applied widely to surrounding enviroment.
Strain gauge can be embedded on the node of solid truss and load change-over panel, can also supporting analysis software, can dynamically demonstrate the stress of stake, and pinpointing the problems in time makes amendment remedies, and avoids potential potential safety hazard, the safety reliability height.
Recurrence by a large amount of engineering practices and test result can obtain more rational soil compressive stress and calculates computation model and provide reliable theory and practice foundation for the modification of regional local regulation with analyzing.
The pattern foundation pit supporting structure form that the present invention implemented is mainly based on steel, though one-time investment more greatly but all recyclable repeated use, its construction consumptive material is except the power that construction is consumed the time, basically can not stay material underground, do not stay any rubbish yet, this be support in diaphragm wall supporting, reinforced concrete pile add supporting can't compare.Adopt SMW worker's method also can't be by comparison.Therefore, this is the rising industry that can obtain the low-carbon environment-friendly that government vigorously supports, and investment repayment is high also to promote the well-being of mankind.
The above only is a preferable enforcement use-case of the present invention, is not to be used to limit protection model figure of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. steel truss formula foundation pit supporting construction is characterized in that: comprise a plurality of steel truss formula fender posts, be connected to form the supporting piling wall by breast boards between stake between every adjacent two steel truss formula fender posts; The described steel truss formula fender post space truss that is square, this square space truss comprises four steel pipes, and two relative sides that these four steel pipes form form truss by the fixedly web member that is welded on the steel pipe, and other two relative sides are distributed with detachable web member; Be connected with the load change-over panel by bolt on the panel point of two native sides of retaining of the truss that described fixedly web member forms.
2. steel truss formula foundation pit supporting construction as claimed in claim 1 is characterized in that: any two node location places of described steel truss formula fender post middle top can connect a space plane truss as Guan Liang or enclose purlin.
3. steel truss formula foundation pit supporting construction as claimed in claim 1 is characterized in that: described steel truss formula fender post is positioned at foundation ditch bottommost place and also connects shoe.
CN 201110192811 2011-07-11 2011-07-11 Steel truss foundation pit supporting structure Active CN102286980B (en)

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CN102286980B CN102286980B (en) 2013-04-17

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102434717A (en) * 2011-12-16 2012-05-02 中国建筑第八工程局有限公司 Construction method of joist steel pipe-jacking work pit
CN102535478A (en) * 2011-12-30 2012-07-04 北京工业大学 Enclosing purlin comprising square steel pipe and light concrete for supporting foundation pit
CN103669370A (en) * 2013-12-24 2014-03-26 福州市规划设计研究院 Recoverable combined groove excavation foundation fit supporting device and construction method
CN103741685A (en) * 2014-01-24 2014-04-23 王立明 Prestressed concrete steel tube and corresponding prestressed concrete steel tube supporting structure
CN105696603A (en) * 2016-04-11 2016-06-22 中铁建大桥工程局集团第四工程有限公司 Truss supporting and steel sheet pile supporting device and method for deep excavation of trenches
CN106677163A (en) * 2016-11-14 2017-05-17 王立明 Pipe hoop truss fender pile and auxiliary construction equipment thereof

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Publication number Priority date Publication date Assignee Title
CN1751157A (en) * 2003-02-14 2006-03-22 韩万烨 Prestressed scaffolding system
CN2835351Y (en) * 2005-10-14 2006-11-08 浙江中成建工集团有限公司 Horizontal supporting structure for reinforced concrete loop truss in deep foundation pit
CN101255697A (en) * 2008-04-10 2008-09-03 王平 Deep building pit trussed-beam inner support integral application pre-stress method
KR20110047506A (en) * 2009-10-30 2011-05-09 (주)동명기술공단종합건축사사무소 Non-Strut Retaining Wall Construction Method, and Non-Strut Retaining Retaining Wall Structure
CN202157328U (en) * 2011-07-11 2012-03-07 福建工大建筑设计院 Steel truss type foundation pit supporting structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1751157A (en) * 2003-02-14 2006-03-22 韩万烨 Prestressed scaffolding system
CN2835351Y (en) * 2005-10-14 2006-11-08 浙江中成建工集团有限公司 Horizontal supporting structure for reinforced concrete loop truss in deep foundation pit
CN101255697A (en) * 2008-04-10 2008-09-03 王平 Deep building pit trussed-beam inner support integral application pre-stress method
KR20110047506A (en) * 2009-10-30 2011-05-09 (주)동명기술공단종합건축사사무소 Non-Strut Retaining Wall Construction Method, and Non-Strut Retaining Retaining Wall Structure
CN202157328U (en) * 2011-07-11 2012-03-07 福建工大建筑设计院 Steel truss type foundation pit supporting structure

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102434717A (en) * 2011-12-16 2012-05-02 中国建筑第八工程局有限公司 Construction method of joist steel pipe-jacking work pit
CN102535478A (en) * 2011-12-30 2012-07-04 北京工业大学 Enclosing purlin comprising square steel pipe and light concrete for supporting foundation pit
CN102535478B (en) * 2011-12-30 2014-07-16 北京工业大学 Enclosing purlin comprising square steel pipe and light concrete for supporting foundation pit
CN103669370A (en) * 2013-12-24 2014-03-26 福州市规划设计研究院 Recoverable combined groove excavation foundation fit supporting device and construction method
CN103741685A (en) * 2014-01-24 2014-04-23 王立明 Prestressed concrete steel tube and corresponding prestressed concrete steel tube supporting structure
CN103741685B (en) * 2014-01-24 2015-12-09 王立明 Comprise the pre-stressed steel pipe concrete truss support structure of pre-stressed steel pipe concrete
CN105696603A (en) * 2016-04-11 2016-06-22 中铁建大桥工程局集团第四工程有限公司 Truss supporting and steel sheet pile supporting device and method for deep excavation of trenches
CN106677163A (en) * 2016-11-14 2017-05-17 王立明 Pipe hoop truss fender pile and auxiliary construction equipment thereof
CN106677163B (en) * 2016-11-14 2019-11-08 王立明 Pipe collar girder fender post and its attached construction equipment

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