CN102839675A - Long-span pre-stress fish belly sill for foundation pit support and mounting method thereof - Google Patents
Long-span pre-stress fish belly sill for foundation pit support and mounting method thereof Download PDFInfo
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- CN102839675A CN102839675A CN2012103624582A CN201210362458A CN102839675A CN 102839675 A CN102839675 A CN 102839675A CN 2012103624582 A CN2012103624582 A CN 2012103624582A CN 201210362458 A CN201210362458 A CN 201210362458A CN 102839675 A CN102839675 A CN 102839675A
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Abstract
The invention provides a 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, the particularly braced structures of the receipts of material utilization and the mounting method of this structure.
Background technology
In foundation pit supporting construction, interior support supporting and protection structure is commonly used encloses purlin, mainly contains reinforced concrete fortifield village purlin and shaped steel and encloses purlin.In order to reduce the quantity in the braced structures to support and angle brace, increase the construction space of foundation ditch, need to increase it and enclose the span of purlin.For this reason, reinforced concrete fortifield village purlin is through the increasing section size, and it then is to realize through the number of plies that increases formed steel construction that shaped steel encloses purlin, but these methods will increase the consumption of support material greatly.So the structural shape of various fringe trusses occurred, so both can increase the span of enclosing purlin, can improve its rigidity again, as shown in Figure 1.When the foundation ditch width hour, can adopt the Eight characters to enclose purlin to what support connected, as shown in Figure 2.
Can find out by Fig. 1, such purlin structural shape that encloses, its span generally can only reach about 15 ~ 25m, and still difficulty reaches and reduces significantly support and angle brace quantity, the purpose in increase foundation pit construction space.Can be found out that by Fig. 2 this Eight characters encloses the purlin structure to what support connected, its span of enclosing purlin can only be controlled at about 5 ~ 10m.Obviously, the rigidity that these two kinds of forms are enclosed purlin is still smaller, is difficult to reach the requirement of large span.
In order to control the horizontal distortion amount of braced structures, the rigidity of large span being enclosed purlin all has higher requirements.The way of the sectional dimension of enclosing purlin through traditional fringe truss structure or increase all is not a Perfected process.
Compare with reinforced concrete fortifield village purlin, prestress steel encloses purlin and has characteristics such as recyclable, recycling, easy for installation and construction period be short.Based on the purpose to environmental protection and energy-saving low-carbon, developing a kind of large-span prestressed steel work, to enclose purlin be necessary, meets the existing industrial policy of China fully.
Summary of the invention
Technical problem to be solved by this invention is, the steel that overcomes braced structures in the existing pattern foundation pit supporting structure encloses that purlin rigidity is low, span is little, and support is connected shortcoming such as inconvenience, and adopting the prestressing force fish belly sill will be the direction of researching and developing.
In order to address the above problem, technical scheme of the present invention is such:
A kind of pattern foundation pit supporting structure is used large-span prestressed fish belly sill, it is characterized in that, comprises lower edge beam, web member and the flexible muscle of the prestressing force that winds up; The web member lower end is fixed on the lower edge beam, and the upper end contacts with the flexible muscle slidingtype of the prestressing force that winds up, and the two ends of the flexible muscle of prestressing force are separately fixed on the two ends of lower edge beam, form a fish belly shape structure; The lower edge beam is a reinforced concrete beam; Two ends of lower edge beam are provided with the flexible muscle of prestressing force are applied prestressed ground tackle, or the web member upper end has the flexible muscle of prestressing force is applied prestressed stretching device.
Web member is many, and many web members are uneven in length or equate or part equates.
Said muscle is many steel strand, and steel strand are made up of many high-strength low loose steel wires.
The smooth contact between steel strand and the web member.
The material of lower edge beam and web member is a shaped steel, connects through bolt connection or welding between the shaped steel.
The lower edge beam is the steel reinforced concrete compound beam, is connected through bolt between shaped steel and the concrete.
Two ends at this fish belly sill need be provided with support bar.
In the lower edge beam outside bearing need be set, these bearings are respectively shaped steel or concrete force transfer key or pre-embedded bolt, and are bearing on the space enclosing structure.
The vertical space enclosing structure that is connected with large-span prestressed fish belly sill is to insert a kind of in the shaped steel in castinplace pile, underground connection wall, the agitation pile.
Web member is that single straight-bar, many straight-bars or Eight characters strut combine.
Be separate between the many web members or link together with tie rod.
A kind of large-span prestressed fish belly sill mounting method is following:
The first step: be installed on the special carriage string beam of fish belly sill and levelling;
Second step: the web member and the string beam that will enclose on the purlin carry out assembly unit, and connect with high-strength bolt;
The 3rd step: at the two ends of enclosing purlin fulcrum connecting elements and string beam are carried out assembly unit, and connect with high-strength bolt;
The 4th step: steel strand are installed, are fixed on the fulcrum connecting elements at two ends, simultaneously steel strand are installed in the top of web member;
The 5th step: the string beam is connected with the bracing of foundation pit body of wall;
The 6th step: the two ends fulcrum connecting elements to the string beam applies support reaction, and applying method is to use the jack Loading Method;
The 7th step: steel strand are applied prestressing force;
String beam and bracing of foundation pit body of wall connected mode in the 5th step is that the method for shaped steel force transfer key is connected or through being welded to connect or connecting with pre-embedded bolt;
In the 7th step, steel strand are applied the prestressing force mode be: on the fulcrum connecting elements of the two ends of steel strand, steel strand tension is loaded, lock with Special ground tackle;
In the 7th step, another kind applies the prestressing force mode to steel strand and is: hold out against steel strand to apply active force through the special-purpose jack that is installed in web ends;
After foundation pit supporting project is accomplished, can follow these steps to accomplish and remove and recycling.
The first step: discharge the whole prestressing force on the steel strand;
Second step: removal encloses the active force on the fulcrum connecting elements of purlin two ends;
The 3rd step: remove being connected between string beam and the bracing of foundation pit wall;
The 4th step: steel is enclosed purlin overall pulling down from foundation ditch hang out, or the web member member is removed from the string beam, resolve into a plurality of parts and hang out respectively;
The 5th step; The steel that hangs out is enclosed purlin be applied to install in another pattern foundation pit supporting structure, realize that this encloses the recycling of purlin.
The purlin that encloses of forming a fish belly shape structure by shaped steel and steel strand; At two ends that enclose purlin two fulcrums are set, steel strand are carried out prestressed stretch-draw with stressing device, then on steel strand, produce stretching force; Steel strand can be through enclosing the web member member at purlin middle part; The lower edge beam is produced active force, and be delivered on the bracing of foundation pit wall that directly contacts with the lower edge beam, thereby can control the excavation slope distortion in the Excavation Process; This encloses, and each main member all is to combine through high-strength bolt in the purlin structure, forms a fish belly shape structure.
Apply prestressed steel strand the web member that encloses on the purlin is produced a pressure, and transfer the pressure on the lower edge beam, remake and be used for the bracing of foundation pit wall, thereby controlled the distortion of the foundation ditch in the Excavation Process.
Beneficial effect, this encloses purlin and has that rigidity is big, span is big, distortion can control, easy construction, recyclable advantage such as multiplexing, has reached the reduction of erection time, has reduced the purpose of construction costs.
Description of drawings
Specify the present invention below in conjunction with the accompanying drawing and the specific embodiment;
Fig. 1 encloses the purlin structural representation for fringe truss formula in the prior art.
Fig. 2 encloses the purlin structural representation for the Eight characters in the prior art to what support connected.
Fig. 3 applies prestressed structural representation for a kind of large-span prestressed fish belly sill structure of the present invention in its end.
Fig. 4 applies prestressed structural representation for a kind of large-span prestressed fish belly sill structure of the present invention on its web member.
Fig. 5 is the sketch map of reinforced concrete beam for the lower edge beam of fish belly sill of the present invention.
Fig. 6 is the another kind of direction sketch map of the support bar of fish belly sill of the present invention.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with concrete diagram, further set forth the present invention.
Referring to Fig. 3, this large-span prestressed fish belly sill structure comprises a lower edge beam 1, steel strand 2, and web member 3 encloses two strong points 4 of purlin, and Special ground tackle 5 is formed.
Its lower edge beam 1 is assembled by the shaped steel material; Its steel strand 2 are made up of many high-strength underrelaxation steel wires, adopt the plastic cement pipe box to play and irritate grease protection and isolation between the every steel strand;
Its web member 3 assembles wooden font or yi word pattern by the shaped steel material; The strong point 4 that it encloses purlin is assembled into triangle by the shaped steel material; Its prestressing force load-lock mechanisms is made up of Special ground tackle 5.
The material of lower edge beam 1 and web member 3 is high-strength shaped steel, is connected with bolt through welding between the shaped steel.At these two ends of enclosing purlin the strong point 4 need be set.The strong point 4 connects support bar 41, is used to apply support force.
In the lower edge beam outside bearing need be set, these bearings are respectively shaped steel or concrete force transfer key or pre-embedded bolt, and are bearing on the space enclosing structure.Its space enclosing structure is bored pile, underground connection wall, and reinforced concrete beam, the stake of SMW worker's method are wherein a kind of.During support, in the outside of lower edge beam 1 effect soil pressure (shown in the arrow), and the support force on the strong point 4 is used for the balance soil pressure.
Be separate between the many web members 3 or link together with tie rod 31.
Referring to Fig. 4, jack 6 is installed on the web member of middle part, an end of jack 6 withstands on the steel strand 2 and to steel strand 2 and applies prestressing force, locks the position of jack 6 then, keeps its pressure.Jack 6 is hydraulic jack or jackscrew.At 5 need of steel strand 2 two ends Special ground tackles steel strand are locked so accordingly, and need not herein the steel strand tractive to be applied prestressing force.All the other are with the purlin structure of enclosing shown in Figure 3.
Referring to Fig. 5, the lower edge beam is a reinforced concrete beam 11.In some foundation ditch, in order to increase the support effect of braced structures, the lower edge beam is set to reinforced concrete beam 11, and this beam can directly replace with the concrete Guan Liang that has built, its good rigidity, and stability is good.All the other are with Fig. 3 or the purlin that encloses shown in Figure 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 the lower edge beam.
Concrete mounting method is following:
The first step: this lower edge beam 1 that encloses purlin is installed on the special shelf bracket and levelling;
Second step: the web member 3 that will enclose on the purlin carries out assembly unit with lower edge beam 1, and connects with high-strength bolt;
The 3rd step: at the two ends of enclosing purlin fulcrum connecting elements 4 and lower edge beam 1 are carried out assembly unit, and connect with high-strength bolt;
The 4th step: steel strand 2 are installed, are fixed on the fulcrum member 4 fulcrum members 4 at two ends, simultaneously steel strand 2 are installed in the top of web member member 3, like Fig. 3 and shown in Figure 4;
The 5th step: lower edge beam 1 is connected with the bracing of foundation pit body of wall, and a kind of is to adopt the method for shaped steel force transfer key to connect, through being welded to connect; A kind of is to connect with pre-embedded bolt, tights a bolt;
The 6th step: two fulcrum members 4 to enclosing purlin apply support reaction, and applying method is to use the jack Loading Method;
The 7th step: apply prestressing force, a kind of method is as shown in Figure 3, the end two on steel strand 2 stretch-draw are loaded on the fulcrum connecting elements 4, produce stretching force; Another kind method is to apply active force through the 6 pairs of steel strand 2 of special-purpose jack that are installed in web member member 3 ends, makes steel strand produce stretching force.
Through above-mentioned steps and mounting method, can form a large span fish belly sill structure, its span can reach more than the 64m.
After foundation pit supporting project is accomplished, can follow these steps to accomplish and remove and recycling.
The first step: discharge the whole prestressing force on the steel strand 2;
Second step: the active force on two fulcrum members 4 of removal;
The 3rd step: remove being connected between lower edge beam 1 and the bracing of foundation pit wall;
The 4th step: steel is enclosed purlin overall pulling down from foundation ditch hang out, also can web member member 3 be removed from lower edge beam 1, resolve into a plurality of parts and hang out respectively;
The 5th step; The steel that hangs out is enclosed purlin be applied to install in another pattern foundation pit supporting structure, realize that this encloses the recycling of purlin.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; The present invention does not receive the restriction of above-mentioned instance; That describes in above-mentioned instance and the manual just explains principle of the present invention; The present invention also has various changes and modifications under the prerequisite that does not break away from spirit and scope of the invention, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.
Claims (16)
1. a pattern foundation pit supporting structure is used large-span prestressed fish belly sill, it is characterized in that, comprises lower edge beam, web member and the flexible muscle of the prestressing force that winds up; The web member lower end is fixed on the lower edge beam, and the upper end contacts with the flexible muscle slidingtype of the prestressing force that winds up, and the two ends of the flexible muscle of prestressing force are separately fixed on the two ends of lower edge beam, form a fish belly shape structure; The lower edge beam is a reinforced concrete beam; Two ends of lower edge beam are provided with the flexible muscle of prestressing force are applied prestressed ground tackle, or the web member upper end has the flexible muscle of prestressing force is applied prestressed stretching device.
2. a kind of large-span prestressed fish belly sill according to claim 1 is characterized in that web member is many, and many web members are uneven in length or equate or part equates.
3. a kind of large-span prestressed fish belly sill according to claim 1 is characterized in that said muscle is many steel strand, and steel strand are made up of many high-strength low loose steel wires.
4. a kind of large-span prestressed fish belly sill according to claim 3 is characterized in that, the smooth contact between steel strand and the web member.
5. a kind of large-span prestressed fish belly sill according to claim 1 is characterized in that the material of lower edge beam and web member is a shaped steel, connects through bolt connection or welding between the shaped steel.
6. a kind of large-span prestressed fish belly sill according to claim 3 is characterized in that the lower edge beam is the steel reinforced concrete compound beam, is connected through bolt between shaped steel and the concrete.
7. a kind of large-span prestressed fish belly sill according to claim 2 is characterized in that, at the two ends of this fish belly sill support bar need be set.
8. a kind of large-span prestressed fish belly sill according to claim 1 is characterized in that, in the lower edge beam outside bearing need be set, and these bearings are respectively shaped steel or concrete force transfer key or pre-embedded bolt, and are bearing on the space enclosing structure.
9. a kind of large-span prestressed fish belly sill according to claim 1 is characterized in that, the vertical space enclosing structure that is connected with large-span prestressed fish belly sill is to insert a kind of in the shaped steel in castinplace pile, underground connection wall, the agitation pile.
10. a kind of large-span prestressed fish belly sill according to claim 2 is characterized in that, web member is that single straight-bar, many straight-bars or Eight characters strut combine.
11. a kind of large-span prestressed fish belly sill according to claim 2 is characterized in that, is separate between the many web members or links together with tie rod.
12. a large-span prestressed fish belly sill mounting method is following:
The first step: be installed on the special carriage string beam of fish belly sill and levelling;
Second step: the web member and the string beam that will enclose on the purlin carry out assembly unit, and connect with high-strength bolt;
The 3rd step: at the two ends of enclosing purlin fulcrum connecting elements and string beam are carried out assembly unit, and connect with high-strength bolt;
The 4th step: steel strand are installed, are fixed on the fulcrum connecting elements at two ends, simultaneously steel strand are installed in the top of web member;
The 5th step: the string beam is connected with the bracing of foundation pit body of wall;
The 6th step: the two ends fulcrum connecting elements to the string beam applies support reaction, and applying method is to use the jack Loading Method;
The 7th step: steel strand are applied prestressing force.
13. a kind of large-span prestressed fish belly sill mounting method according to claim 12 is characterized in that, string beam and the bracing of foundation pit body of wall connected mode in the 5th step is that the method for shaped steel force transfer key is connected or through being welded to connect or connecting with pre-embedded bolt.
14. a kind of large-span prestressed fish belly sill mounting method according to claim 12; It is characterized in that; In the 7th step, steel strand are applied the prestressing force mode be: on the fulcrum connecting elements of the two ends of steel strand, steel strand tension is loaded, lock with Special ground tackle.
15. a kind of large-span prestressed fish belly sill mounting method according to claim 12; It is characterized in that; In the 7th step, another kind applies the prestressing force mode to steel strand and is: hold out against steel strand to apply active force through the special-purpose jack that is installed in web ends.
16. a kind of large-span prestressed fish belly sill mounting method according to claim 12 is characterized in that, after foundation pit supporting project is accomplished, can follow these steps to accomplish and remove and recycling.
The first step: discharge the whole prestressing force on the steel strand;
Second step: removal encloses the active force on the fulcrum connecting elements of purlin two ends;
The 3rd step: remove being connected between string beam and the bracing of foundation pit wall;
The 4th step: steel is enclosed purlin overall pulling down from foundation ditch hang out, or the web member member is removed from the string beam, resolve into a plurality of parts and hang out respectively;
The 5th step; The steel that hangs out is enclosed purlin be applied to install in another pattern foundation pit supporting structure, realize that this encloses the recycling of purlin.
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| CN103015434A (en) * | 2012-12-31 | 2013-04-03 | 上海强劲地基工程股份有限公司 | High-stiffness monolithic prestress assembly type foundation pit bracing inner-supporting system |
| CN103161169A (en) * | 2013-03-13 | 2013-06-19 | 上海强劲地基工程股份有限公司 | Prestressed girder for foundation pit supporting |
| CN103696429A (en) * | 2013-12-03 | 2014-04-02 | 中铁十三局集团第三工程有限公司 | Concrete support and fish-belly sill combined supporting system of special-shaped foundation pit and construction method |
| CN103981874A (en) * | 2014-05-28 | 2014-08-13 | 德清鑫德机械有限公司 | Prestressed supporting structure for long rectangular foundation pit |
| CN105672380A (en) * | 2016-04-01 | 2016-06-15 | 浙江大学 | Test device and method for simulating installation of inner support in process of pit excavation |
| CN105908754A (en) * | 2016-05-20 | 2016-08-31 | 东通岩土科技（杭州）有限公司 | Crescent beam supporting system of building foundation pit |
| CN106013170A (en) * | 2016-05-20 | 2016-10-12 | 东通岩土科技（杭州）有限公司 | Prestress steel member crescent beam ejecting device |
| CN106284367A (en) * | 2015-05-29 | 2017-01-04 | 上海城地建设股份有限公司 | A kind of foundation pit supporting construction using scalable prestress steel to support |
| CN106930296A (en) * | 2017-04-01 | 2017-07-07 | 中交第三航务工程局有限公司宁波分公司 | A kind of construction method of internal support of foundation pit |
| CN106958248A (en) * | 2017-04-01 | 2017-07-18 | 中交第三航务工程局有限公司宁波分公司 | The construction method of pattern foundation pit supporting structure |
| CN106958249A (en) * | 2017-04-01 | 2017-07-18 | 中交第三航务工程局有限公司宁波分公司 | The installation of prestressing force fish belly sill tool-type combination inner support and method for dismounting |
| 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 |
| CN108560564A (en) * | 2018-05-24 | 2018-09-21 | 东南大学 | A kind of band tilts the deep foundation pit support prestressing force fish belly sill of strut |
| CN108560563A (en) * | 2018-05-24 | 2018-09-21 | 东南大学 | A kind of deep foundation pit support prestressing force fish belly sill that drag-line can be locked |
| CN108677964A (en) * | 2018-05-24 | 2018-10-19 | 东南大学 | A kind of prestressing force fish belly sill of the deep foundation pit support with anti-rotation rope |
| 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 |
| CN116873757A (en) * | 2023-09-04 | 2023-10-13 | 中国船舶集团国际工程有限公司 | Fish-bellied crane girder |
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| CN103015434A (en) * | 2012-12-31 | 2013-04-03 | 上海强劲地基工程股份有限公司 | High-stiffness monolithic prestress assembly type foundation pit bracing inner-supporting system |
| CN103161169A (en) * | 2013-03-13 | 2013-06-19 | 上海强劲地基工程股份有限公司 | Prestressed girder for foundation pit supporting |
| CN103161169B (en) * | 2013-03-13 | 2015-06-17 | 上海强劲地基工程股份有限公司 | Prestressed girder for foundation pit supporting |
| CN103696429A (en) * | 2013-12-03 | 2014-04-02 | 中铁十三局集团第三工程有限公司 | Concrete support and fish-belly sill combined supporting system of special-shaped foundation pit and construction method |
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| CN103981874A (en) * | 2014-05-28 | 2014-08-13 | 德清鑫德机械有限公司 | Prestressed supporting structure for long rectangular foundation pit |
| CN103981874B (en) * | 2014-05-28 | 2016-01-06 | 德清鑫德机械有限公司 | A kind of prestressing force supporting and protection structure for elongated rectangular shape foundation ditch |
| CN106284367A (en) * | 2015-05-29 | 2017-01-04 | 上海城地建设股份有限公司 | A kind of foundation pit supporting construction using scalable prestress steel to support |
| CN105672380A (en) * | 2016-04-01 | 2016-06-15 | 浙江大学 | Test device and method for simulating installation of inner support in process of pit excavation |
| CN106013170B (en) * | 2016-05-20 | 2018-03-09 | 东通岩土科技（杭州）有限公司 | Prestress steel component crescent moon beam holding device |
| CN106013170A (en) * | 2016-05-20 | 2016-10-12 | 东通岩土科技（杭州）有限公司 | Prestress steel member crescent beam ejecting device |
| CN105908754A (en) * | 2016-05-20 | 2016-08-31 | 东通岩土科技（杭州）有限公司 | Crescent beam supporting system of building foundation pit |
| CN106930296A (en) * | 2017-04-01 | 2017-07-07 | 中交第三航务工程局有限公司宁波分公司 | A kind of construction method of internal support of foundation pit |
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| CN106958248A (en) * | 2017-04-01 | 2017-07-18 | 中交第三航务工程局有限公司宁波分公司 | The construction method of pattern foundation pit supporting structure |
| 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 |
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| 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 |
| CN116873757A (en) * | 2023-09-04 | 2023-10-13 | 中国船舶集团国际工程有限公司 | Fish-bellied crane girder |
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