CN102839675B - Method of long-span pre-stress fish belly sill for foundation pit support - Google Patents
Method of long-span pre-stress fish belly sill for foundation pit support Download PDFInfo
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- CN102839675B CN102839675B CN201210362458.2A CN201210362458A CN102839675B CN 102839675 B CN102839675 B CN 102839675B CN 201210362458 A CN201210362458 A CN 201210362458A CN 102839675 B CN102839675 B CN 102839675B
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Abstract
The invention provides an assembly method of long-span pre-stress fish belly sill. The long-span pre-stress fish belly sill is used for overcoming the defects of low rigidity, small span and insecure connection with opposite support of an encircling purlin of a supporting structure in the present foundation pit support. The encircling purlin has the advantages of high rigidity, long span, control deformation reliability, convenience in construction, reusability, and the like. The purposes of increasing the degree of safety of the foundation pit support, shortening the construction period and lowering the construction cost are achieved.
Description
Technical field
The present invention relates to technical field of civil engineering, particularly pattern foundation pit supporting structure inner supporting structure, particularly the braced structures that utilizes of the receipts of material and the mounting method of this structure.
Background technology
In foundation pit supporting construction, what inner support supporting and protection structure was conventional encloses purlin, mainly contains reinforced concrete fortifield village purlin and shaped steel encloses purlin.In order to reduce in braced structures to support and the quantity of angle brace, increase the construction space of foundation ditch, need to increase the span that it encloses purlin.For this reason, reinforced concrete fortifield village purlin is by increasing section size, and it is then realized by the number of plies of increase formed steel construction that shaped steel encloses purlin, but these methods will increase the consumption of support material greatly.So there is the structural shape of various fringe truss, so both can increase the span of enclosing purlin, its rigidity can have been improved again, as shown in Figure 1.When foundation ditch width is less, what the Eight characters can be adopted to connect support encloses purlin, as shown in Figure 2.
As seen from Figure 1, such encloses purlin structural shape, and its span generally can only reach about 15 ~ 25m, and still difficulty reaches and significantly reduces support and angle brace quantity, increases the object in foundation pit construction space.As seen from Figure 2, what this Eight characters connected support encloses purlin structure, and its span of enclosing purlin can only control at about 5 ~ 10m.Obviously, the rigidity that these two kinds of forms enclose purlin is still smaller, is difficult to the requirement reaching large span.
In order to control the horizontal distortion amount of braced structures, the rigidity of large span being enclosed to purlin all has higher requirements.Being enclosed the way of the sectional dimension of purlin by traditional fringe truss structure or increase, is not all Perfected process.
Compared with reinforced concrete fortifield village purlin, prestress steel encloses purlin and has the features such as recyclable, recycling, easy for installation and construction period be short.Based on the object to environmental protection and energy-saving low-carbon, developing a kind of large-span prestressed steel structure, to enclose purlin be necessary, meets the industrial policy that China is existing completely.
Summary of the invention
Technical problem to be solved by this invention is, the steel overcoming braced structures in existing pattern foundation pit supporting structure encloses that purlin rigidity is low, span is little, and to supportting shortcomings such as being connected inconvenience, adopts prestressing force fish belly sill will be the direction of research and development.
In order to solve the problem, technical scheme of the present invention is such:
A kind of mounting method of large-span prestressed fish belly sill is as follows:
The first step: the lower-cord beam of fish belly sill to be arranged on special bracket and levelling;
Second step: steel is enclosed web member on purlin and lower-cord beam carries out assembled, and connect with high-strength bolt;
3rd step: fulcrum connecting elements and lower-cord beam carry out assembled by the two ends of enclosing purlin at steel, and connect with high-strength bolt;
4th step: install steel strand, be fixed on the fulcrum connecting elements at two ends, steel strand be arranged on the top of web member simultaneously;
5th step: by lower-cord beam and bracing of foundation pit wall connecting;
6th step: apply support reaction to the two ends fulcrum connecting elements of lower-cord beam, applying method uses jack Loading Method;
7th step: to steel strand Shi Hanzhang;
The method that lower-cord beam in 5th step and bracing of foundation pit wall connecting mode are shaped steel force transfer key is connected or by being welded to connect or connecting with pre-embedded bolt;
In 7th step, to steel strand Shi Hanzhang mode be: on the two ends fulcrum connecting elements of steel strand, steel strand tension is loaded, lock with Special ground tackle;
In 7th step, another kind to steel strand Shi Hanzhang mode is: hold out against steel strand to apply active force by the Special jack being arranged on web ends;
After foundation pit supporting project completes, can follow these steps to remove and recycling.
The first step: the whole prestressing force on release steel strand;
Second step: removal steel encloses the active force on the fulcrum connecting elements of purlin two ends;
3rd step: remove the connection between lower-cord beam and bracing of foundation pit body of wall;
4th step: steel is enclosed purlin overall pulling down from foundation ditch and hang out, or web member is removed from lower-cord beam, resolve into multiple parts and hang out respectively;
5th step; The steel hung out is enclosed purlin to be applied in another pattern foundation pit supporting structure and to install, realize the recycling that this steel encloses purlin.
The steel being made up of a fish belly shape structure shaped steel and steel strand encloses purlin, two ends enclosing purlin at steel arrange two fulcrums, prestressed stretch-draw is carried out to steel strand stressing device, then on steel strand, produce stretching force, steel strand enclose the web member in the middle part of purlin by steel, active force is produced to lower-cord beam, and be delivered on the bracing of foundation pit body of wall that directly contacts with lower-cord beam, thus the excavation slope distortion that can control in Excavation Process, it is all combined by high-strength bolt that this steel encloses each main member in purlin structure, forms a fish belly shape structure.
The steel strand of Shi Hanzhang produce a pressure to the web member that steel encloses on purlin, and transfer the pressure on lower-cord beam, remake for bracing of foundation pit body of wall, thus control the distortion of the foundation ditch in Excavation Process.
Beneficial effect, this steel encloses purlin and has the advantages such as rigidity is large, span large, distortion can control, easy construction, reusing, reaches the reduction of erection time, reduces the object of construction costs.
Accompanying drawing explanation
The present invention is described in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 be in prior art fringe truss formula enclose purlin structural representation.
Fig. 2 be in prior art the Eight characters to support connect enclose purlin structural representation.
Fig. 3 is the structural representation of a kind of large-span prestressed fish belly sill structure of the present invention at its end Shi Hanzhang.
Fig. 4 is the structural representation of a kind of large-span prestressed fish belly sill structure of the present invention Shi Hanzhang on its web member.
Fig. 5 is the lower-cord beam of fish belly sill of the present invention is the schematic diagram of reinforced concrete beam.
Fig. 6 is the support bar another kind of direction schematic diagram of fish belly sill of the present invention.
Detailed description of the invention
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
Referring to Fig. 3, this large-span prestressed fish belly sill structure, comprises a lower-cord beam 1, steel strand 2, web member 3, and steel encloses two strong points 4 of purlin, and Special ground tackle 5 forms.
Its lower-cord beam 1 is assembled by section steel material; Its steel strand 2, are made up of many high-strength underrelaxation steel wires, adopt plastic cement pipe box to rise and fill with grease protection and isolation between every root steel strand;
Its web member 3, assembles wooden font or yi word pattern by section steel material; Its steel encloses the strong point 4 of purlin, is assembled into triangle by section steel material; Its prestressing force load-lock mechanisms, is made up of Special ground tackle 5.
Web member 3 arranges on string beam 1, and the two ends of steel strand 2 connect lower-cord beam 1 two ends, and the middle part of steel strand 2 is supported in fish belly shape by web member 3.What shaped steel and steel strand are assembled into a fish belly shape structure encloses purlin, and to steel strand Shi Hanzhang, to reach increase, this encloses purlin span, increases and encloses purlin rigidity, controls the object of the horizontal distortion of foundation ditch.
Steel strand 2 are many, and steel strand 2 are made up of the reinforcing bar of many high-strength low relaxation.Smooth contact between steel strand 2 and web member 3, many steel strand 2 hierarchal arrangement.Steel strand 2 both ends are provided with Special ground tackle 5, adopt stretching method to steel strand Shi Hanzhang and are locked in special ground tackle, keeping its prestressing force.
The material of lower-cord beam 1 and web member 3 is high-strength shaped steel, is connected between shaped steel by welding with bolt.Need to arrange the strong point 4 at the two ends that this encloses purlin.The strong point 4 connects support bar 41, for applying support force.
Need to arrange bearing outside lower-cord beam, these bearings are respectively shaped steel or concrete force transfer key or pre-embedded bolt, and are bearing in space enclosing structure.Its space enclosing structure is bored pile, underground connection wall, and reinforced concrete beam, the stake of SMW engineering method are wherein a kind of.During support, in the outside of lower-cord beam 1 effect soil pressure (shown in arrow), and the support force on the strong point 4 is used for balancing earth pressure power.
Web member 3 combines for single straight-bar, many bars straight-bar or Eight characters strut.
Between many web members 3 be separate or with contact bar 31 link together.
Referring to Fig. 4, middle part web member is installed jack 6, one end of jack 6 to withstand on steel strand 2 and to steel strand 2 Shi Hanzhang, then locks the position of jack 6, keep its pressure.Jack 6 is hydraulic jack or jackscrew.Only steel strand need to be locked at steel strand 2 two ends Special ground tackle 5 so accordingly, and without the need to herein to steel strand tractive Shi Hanzhang.All the other are with enclosing purlin structure shown in Fig. 3.
Referring to Fig. 5, lower-cord beam is reinforced concrete beam 11.In some foundation ditch, in order to increase the support effect of braced structures, lower-cord beam is set to reinforced concrete beam 11, this beam can directly replace with the concrete Guan Liang built, its good rigidity, good stability.All the other are with enclosing purlin shown in Fig. 3 or Fig. 4.
Referring to Fig. 6, the direction of support bar 41 is the oblique connection strong point, also can be the vertical direction vertical with lower-cord beam.
Concrete mounting method is as follows:
The first step: the lower-cord beam 1 that this steel encloses purlin to be arranged on special shelf bracket and levelling;
Second step: the web member 3 enclosed by steel on purlin carries out assembled with lower-cord beam 1, and connects with high-strength bolt;
3rd step: fulcrum connecting elements 4 and lower-cord beam 1 carry out assembled by the two ends of enclosing purlin at steel, and connect with high-strength bolt;
4th step: install steel strand 2, be fixed on fulcrum member 4 fulcrum member 4 at two ends, steel strand 2 be arranged on the top of web member 3, as shown in Figure 3 and Figure 4 simultaneously;
5th step: by lower-cord beam 1 and bracing of foundation pit wall connecting, a kind of is adopt the method for shaped steel force transfer key to connect, by being welded to connect; One connects with pre-embedded bolt, tights a bolt;
6th step: two fulcrum member 4 steel being enclosed to purlin apply support reaction, and applying method uses jack Loading Method;
7th step: Shi Hanzhang, a kind of method as shown in Figure 3, on two of end, fulcrum connecting elements 4 loads steel strand 2 stretch-draw, produces stretching force; Another kind method is that the Special jack 6 pairs of steel strand 2 by being arranged on web member 3 end apply active force, makes steel strand produce stretching force.
By above-mentioned steps and mounting method, can form a large span fish belly sill structure, its span can reach more than 64m.
After foundation pit supporting project completes, can follow these steps to remove and recycling.
The first step: the whole prestressing force on release steel strand 2;
Second step: the active force on removal two fulcrum member 4;
3rd step: remove the connection between lower-cord beam 1 and bracing of foundation pit body of wall;
4th step: steel is enclosed purlin overall pulling down from foundation ditch and hang out, also can remove web member 3 from lower-cord beam 1, resolve into multiple parts and hang out respectively;
5th step; The steel hung out is enclosed purlin to be applied in another pattern foundation pit supporting structure and to install, realize the recycling that this steel encloses purlin.
More than show and describe general principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not by the restriction of above-mentioned example; what describe in above-mentioned example and manual just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. the mounting method of a large-span prestressed fish belly sill is as follows:
The first step: the lower-cord beam of fish belly sill to be arranged on special bracket and levelling;
Second step: steel is enclosed web member on purlin and lower-cord beam carries out assembled, and connect with high-strength bolt;
3rd step: fulcrum connecting elements and lower-cord beam carry out assembled by the two ends of enclosing purlin at steel, and connect with high-strength bolt;
4th step: install steel strand, be fixed on the fulcrum connecting elements at two ends, steel strand be arranged on the top of web member simultaneously;
5th step: by lower-cord beam and bracing of foundation pit wall connecting;
6th step: apply support reaction to the two ends fulcrum connecting elements of lower-cord beam, applying method uses jack Loading Method;
7th step: to steel strand Shi Hanzhang;
Described fish belly sill, comprises lower-cord beam, web member and steel strand; Web member lower end is fixed on lower-cord beam, and upper end contacts with steel strand slidingtype, and the two ends of steel strand are separately fixed on the two ends of lower-cord beam, forms a fish belly shape structure; Lower-cord beam is reinforced concrete beam; Two ends of lower-cord beam are provided with the ground tackle to steel strand Shi Hanzhang, or web member upper end has the stretching device to steel strand Shi Hanzhang.
2. the mounting method of a kind of large-span prestressed fish belly sill according to claim 1, is characterized in that, the method that the lower-cord beam in the 5th step and bracing of foundation pit wall connecting mode are shaped steel force transfer key is connected or by being welded to connect or connecting with pre-embedded bolt.
3. the mounting method of a kind of large-span prestressed fish belly sill according to claim 1, it is characterized in that, in 7th step, to steel strand Shi Hanzhang mode be: on the two ends fulcrum connecting elements of steel strand, steel strand tension is loaded, lock with Special ground tackle.
4. the mounting method of a kind of large-span prestressed fish belly sill according to claim 1, it is characterized in that, in 7th step, another kind to steel strand Shi Hanzhang mode is: hold out against steel strand to apply active force by the Special jack being arranged on web ends.
5. the mounting method of a kind of large-span prestressed fish belly sill according to claim 1, is characterized in that, after foundation pit supporting project completes, can follow these steps to remove and recycling,
The first step: the whole prestressing force on release steel strand;
Second step: removal steel encloses the active force on the fulcrum connecting elements of purlin two ends;
3rd step: remove the connection between lower-cord beam and bracing of foundation pit body of wall;
4th step: steel is enclosed purlin overall pulling down from foundation ditch and hang out, or web member is removed from lower-cord beam, resolve into multiple parts and hang out respectively;
5th step; The steel hung out is enclosed purlin to be applied in another pattern foundation pit supporting structure and to install, realize the recycling that this steel encloses purlin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210362458.2A CN102839675B (en) | 2012-09-25 | 2012-09-25 | Method of long-span pre-stress fish belly sill for foundation pit support |
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| CN201210362458.2A CN102839675B (en) | 2012-09-25 | 2012-09-25 | Method of long-span pre-stress fish belly sill for foundation pit support |
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| CN102839675A CN102839675A (en) | 2012-12-26 |
| CN102839675B true CN102839675B (en) | 2014-12-24 |
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| CN108560562A (en) * | 2018-05-24 | 2018-09-21 | 东南大学 | A kind of stay length adjustable deep foundation pit support prestressing force fish belly sill |
| CN112709155A (en) * | 2021-01-21 | 2021-04-27 | 上海城建市政工程（集团）有限公司 | Fish belly type suspension cable combined support and construction method thereof |
| CN114737594A (en) * | 2022-05-06 | 2022-07-12 | 江苏海洋大学 | Large-span unbonded prestressed tendon's fish belly formula foundation beam |
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