CN102286980B - Steel truss foundation pit supporting structure - Google Patents

Steel truss foundation pit supporting structure Download PDF

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Publication number
CN102286980B
CN102286980B CN 201110192811 CN201110192811A CN102286980B CN 102286980 B CN102286980 B CN 102286980B CN 201110192811 CN201110192811 CN 201110192811 CN 201110192811 A CN201110192811 A CN 201110192811A CN 102286980 B CN102286980 B CN 102286980B
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truss
steel
supporting
steel truss
foundation pit
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CN102286980A (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 foundation pit supporting structure
[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 Foundation Support 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.
Deep Foundation Pit Supporting Project 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 reinforcement type supporting and gear type supporting two a large class.
One, prop up the supporting of gear type at present commonly used steel sheet pile supporting, bored pile barricade, diaphragm wall supporting are arranged, with several patterns such as inner support row of piles supportings, and in these support systems, often be aided with the sealing antiseepage, support and draw the technical measures such as anchor, dewatering and drainage, shoveling unloading, make supporting scheme reach the effect of gear 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 at present and I-shaped shaped steel also spread the support form that blocks water with agitation pile, its support stiffness is less, often needs multiple tracks to support, and has a strong impact on the soil excavation of foundation ditch, the larger 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, the characteristics such as rigidity is large, bending resistance is strong, distortion less that it has.Because leave the gap of 100mm~300mm between the stake, the dash weak effect need to 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 gear 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, mechanization degree is high, and cost is high, and its employing should be combined with inner liner rear as the use of works exterior wall, can reduce the cost of supporting and protection structure.
Two, reinforcement type supporting
Deep cement-mixed 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 at present 7m with interior dark pattern foundation pit supporting structure, 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 larger.
Existing support construction engineering method patent is: " LXK engineering method " cantilevered reinforced cement soil supporting and protection structure (patent No.: ZL95117076.7), but its engineering method remains the in the past combination of some engineering methods, have equally some problems of above supporting type, 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.Although its steel are also recyclable but also need adopt the cement mixing pile sealing, the ratio of rigidity of opposing horizontal force is relatively poor, therefore more horizontal support need to 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 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 pit supporting engineering will be wasted more than the steel 100t concrete 2000m at least in the coastal area 3More than, waste surprising.Present the most economic steel sheet pile is the good measures of preventing water of neither one also, and owing to be subjected to the restriction of steel section size and construction equipment, this support form needs the multiple tracks horizontal support, and foundation pit deformation is large, and operation is more, and hidden dangers in project is many.Base pit engineering is an engineering that risk is larger, 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 for 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 foundation pit supporting structure of a kind of environmental protection joint source, easy construction, and this supporting and protection structure is so that fender post and go along with sb. to guard him 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 foundation pit supporting structure comprises a plurality of steel truss type fender posts, is connected to form the supporting piling wall by breast boards between stake between every adjacent two steel truss type fender posts; The described steel truss type 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 bolted the load change-over panel on the panel point of two native sides of gear of the truss that described fixedly web member forms.
Any two node location places of described steel truss type fender post middle top can connect a space plane truss as Guan Liang or enclose purlin.
Described steel truss type 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; The steel truss type fender post and go along with sb. to guard him supporting member can be according to the force request any combination, relevant member can be processed into standard component, assembling flexibly; Recyclable recycling behind all member workers meets the strategic requirement that national environmental protection saves the 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 type fender post of the present invention is connected to form support wall by breast boards between stake top view.
Fig. 2 is the steel truss type 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 type fender post excavation of foundation pit back wall one side of the present invention.
Fig. 4 be in the steel truss type fender post of the present invention the load change-over panel with the stake between breast boards be connected top view.
[specific embodiment]
As shown in Figure 1, steel truss foundation pit supporting structure comprises a plurality of steel truss type fender posts 10, is connected to form the supporting piling wall by breast boards between stake 20 between every adjacent two steel truss type fender posts 10; Steel truss type 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) has been bolted load change-over panel 14.
As shown in Figure 2, steel truss type fender post 10 is near the structural representation of foundation ditch body of wall one side.The fixedly boom 12 that distributes on it from top to bottom horizontal, tilting interval arranges.As shown in Figure 3, the detachable web member 13 of all the other two sides distributions also is that horizontal, tilting interval arranges from top to bottom.Detachable web member 13 is bolted on steel pipe 11, can dismantle.The length of detachable web member 13 is adjustable, can regulate the thickness of support wall according to the length of regulating detachable web member 13 like this.Steel truss type 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 encloses purlin is resisted horizontal movement to increase the truss stake ability.
Steel truss type fender post 10 can be realized spreading by flange, and when the higher support wall of needs, the steel truss type fender post can a plurality ofly be arranged from top to bottom, between connect by flange.
The bottommost of steel truss type fender post 10 is bolted a shoe 30.The connecting elements impact 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, its Main Function is gear soil, sealing, also play simultaneously and converted 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 as the force request of two power bars, this also is the key point that truss can be used as foundation pit supporting pile.Load change-over panel 14 can adopt Plate Welding to form the member that also can 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 rear 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, in order in time obtain the earth pressue at rest of a soil layer, and analyze the stressing conditions of truss with this, and then adjusted 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 of the Tension Members with Arbitrary Shape 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 make things convenient for during vibration dip buries as long as can accomplish to keep off native sealing.Breast boards 20 should be inserted into design elevation by the notch that vibrates along its load change-over panel both sides between stake after the construction of square space truss sunk pile is finished, can insert at active region and also can insert at passive area, as keep off native sealing and need to also can all insert breast boards at main passive area.
The present invention by specification and the length of designing unit according to Geological condition and each member of excavation of foundation pit Depth determination, will be dispatched into the job site by factory process after the required member statistics in practice.Operation is as follows during construction:
According to the position of designing requirement excavation gathering sill and the accurately square truss stake in location → on-site consolidation truss stake 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 Formwork Support for External 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 and construct → vibrate and extract between stake breast boards → vibration and extract truss stake → the remove Loading 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, all right supporting analysis software, and capable of dynamic demonstrates the stress of stake, and pinpointing the problems in time makes amendment remedies, and avoids potential potential safety hazard, and safety reliability is high.
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 implements is mainly take steel as main, although one-time investment is recyclable reusing more greatly but all, the power that its construction consumptive material consumed except when construction, basically can not stay material underground, also do not stay any rubbish, this is that diaphragm wall supporting, reinforced concrete pile add the inner support supporting and can't compare.Adopt the SMW engineering 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 better enforcement use-case of the present invention, is not be used to limiting protection model figure of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. steel truss foundation pit supporting structure is characterized in that: comprise a plurality of steel truss type fender posts, be connected to form the supporting piling wall by breast boards between stake between every adjacent two steel truss type fender posts; The described steel truss type 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 bolted the load change-over panel on the panel point of two native sides of gear of the truss that described fixedly web member forms.
2. steel truss foundation pit supporting structure as claimed in claim 1, it is characterized in that: any two node location places of described steel truss type fender post middle top connect a space plane truss as Guan Liang or enclose purlin.
3. steel truss foundation pit supporting structure as claimed in claim 1, it is characterized in that: described steel truss type 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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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102434717B (en) * 2011-12-16 2013-06-19 中国建筑第八工程局有限公司 Construction method of joist steel pipe-jacking work 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
CN103669370B (en) * 2013-12-24 2015-05-13 福州市规划设计研究院 Recoverable combined groove excavation foundation fit supporting device and construction method
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
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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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

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