CN204825914U - A reinforced concrete roof beam and fish belly sill combined supporting structure for complicated plane foundation ditch - Google Patents
A reinforced concrete roof beam and fish belly sill combined supporting structure for complicated plane foundation ditch Download PDFInfo
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- CN204825914U CN204825914U CN201520524789.0U CN201520524789U CN204825914U CN 204825914 U CN204825914 U CN 204825914U CN 201520524789 U CN201520524789 U CN 201520524789U CN 204825914 U CN204825914 U CN 204825914U
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Abstract
The utility model relates to a reinforced concrete roof beam and fish belly sill combined supporting structure for complicated plane foundation ditch. The beneficial effects of the utility model are that: can be applied to complicated plane foundation ditch, limit, node that wherein out -of -shape, atress are complicated adopt horizontal reinforced concrete bearing structure, and other a safe edge can adopt the fish belly sill strutting arrangement of different spans, and security, reliability can be guaranteed to it, do to make supporting construction easily construct, simultaneously, are favorable to the construction of earthwork excavation and the middle part tower etc. In foundation ditch middle part place. The utility model discloses cancelled fish belly sill steel strand wires ground tackle base, the direct anchoring of steel strand wires is on horizontal reinforced concrete bearing structure. Consequently, bearing structure need not whole synchronous construction, and the reinforced concrete that can be under construction an earlier supporting beam then carries out fish belly sill construction and steel strand stretching locking, is favorable to lower part process segmentation to carry out the flowing water construction.
Description
Technical field
The utility model belongs to building foundation pit bracing or strutting arrangement technical field, is specifically related to a kind of reinforced concrete beam for complex plane foundation ditch and fish belly sill integral supporting structure.
Background technology
Reinforced concrete support structural entity rigidity is large, and security reliability is high, is out of shape little, and cast-in-place node can not produce and loosens and increase body of wall displacement, is applicable to the foundation ditch of various complex plane shape.This structure normability is good, as required, can water build up required by design according to different templates size and style, especially can be used for node and the supporting border of complex contour.The required precision of reinforced concrete support structure construction is lower, and construction corps easily grasps and implements.But reinforced concrete supports the general 8m to 10m of support point spacing, when the supporting length of side is longer, comparatively intensive to strut member, take up room comparatively large, be unfavorable for soil excavation, be especially unfavorable for middle part basement structure construction.
At present, prestressing force fish belly sill supporting and protection structure obtains extensive use further as a kind of novel supporting and protection structure.This structure is by fish belly sill, to support, angle brace, triangle joint component with enclose the component assemblies such as purlin and form.The prestressing force that be added in advance on steel strand is mainly formed support force by fish belly sill, and with earth pressure balance, the pulling force of steel strand is delivered to by fish belly sill bottom girder on the triangle joint component that is adjacent, is finally delivered on angle brace (to support).Connected by high-strength bolt between this structural steel shape, peace tears simple and fast open, recyclable recycling.Repeatedly can apply pre-applied force.Meanwhile, its span can reach more than 60m, and its space is comparatively open, and soil excavation efficiency is higher.But fish belly sill is stressed finally to be born by shape steel diagonal supporting (to support), and the rigidity of type steel support is relatively little, especially relatively on the weak side when span is larger, and cause the horizontal movement of foundation ditch comparatively large, stability is affected.The stressed complexity of support node, rod member requirement on machining accuracy are high.It is connected by shaped steel part bolt or is welded to form, and error easily adds up, and the difficulty of design and construction is comparatively large, and design or construction wrong often easily cause because of column joints deformation and steel structure support additional deformation, and then the horizontal movement causing foundation ditch excessive.
Summary of the invention
In order to solve the problems referred to above that prior art exists, the utility model provides a kind of reinforced concrete beam for complex plane foundation ditch and fish belly sill integral supporting structure.
For reinforced concrete beam and the fish belly sill integral supporting structure of complex plane foundation ditch, comprise along the spaced vertical supporting and protection structure of complicated margin of foundation pit, horizontal reinforcement concrete support structure and fish belly sill braced structures, one deck collar tie beam is fixed with at the top of vertical supporting and protection structure, the above-below direction of vertical supporting and protection structure is fixed with the collar tie beam of at least one deck, the horizontal reinforcement concrete support structure how group is fixed together with collar tie beam is provided with at vertical supporting and protection structure clear width, support post is installed with at the interval, bottom of horizontal reinforcement concrete support structure, the fish belly sill braced structures corresponding with it is provided with between at least one adjacent level reinforced concrete support structure, fish belly sill braced structures comprises shaped steel and encloses purlin, bracing or strutting arrangement and steel strand, inside collar tie beam, be fixed with shaped steel enclose purlin, enclose inside purlin at shaped steel and be fixed with bracing or strutting arrangement, steel strand are provided with in the inner side of bracing or strutting arrangement, the two ends of steel strand are separately fixed in the horizontal reinforcement concrete support structure of both sides.
Horizontal reinforcement concrete support structure vertically supporting and protection structure is provided with at least two layers from top to bottom, between at least one adjacent level reinforced concrete support structure, be provided with the fish belly sill braced structures corresponding with its number of plies.
The inner side of collar tie beam is installed with two row's stone bolt from top to bottom, and shaped steel is enclosed purlin and is fixedly mounted on inside collar tie beam by stone bolt and nut.
The horizontal reinforcement concrete support structure of steel strand both sides is respectively equipped with steel strand preformed hole, have steel sleeve at steel strand preformed hole internal fixtion, the two ends of steel strand are each passed through steel sleeve and are fixedly mounted in horizontal reinforcement concrete support structure by porous anchor.
The horizontal reinforcement concrete support structure of steel strand both sides is respectively equipped with steel strand preformed hole, have steel sleeve at steel strand preformed hole internal fixtion, the two ends of steel strand are each passed through steel sleeve and are fixedly mounted in horizontal reinforcement concrete support structure by porous anchor.
Horizontal reinforcement concrete support structure internal fixtion outside steel strand preformed hole has level and vertical and oblique reinforcement arrangement of reinforcement, or/and, be provided with billet between porous anchor and steel sleeve.
Bracing or strutting arrangement comprises shaped steel lower chord, support bar, shaped steel web member and steel strand bearing, the outside that shaped steel lower chord and shaped steel enclose purlin is fixed together, at least three support bars are fixed with at the outside spacers of shaped steel lower chord, and the support bar height in middle part to direction, both sides sequentially reduces, each support bar is installed with steel strand bearing, steel strand are positioned at steel strand bearing, shaped steel web member is fixed with between shaped steel lower chord and support bar, shaped steel column is fixed with between support bar, the shaped steel crossbeam be fixed together with support bar is fixed with between shaped steel column.
Bracing or strutting arrangement comprises shaped steel lower chord, support bar, shaped steel web member and steel strand bearing, the outside that shaped steel lower chord and shaped steel enclose purlin is fixed together, at least three support bars are fixed with at the outside spacers of shaped steel lower chord, and the support bar height in middle part to direction, both sides sequentially reduces, each support bar is installed with steel strand bearing, steel strand are positioned at steel strand bearing, shaped steel web member is fixed with between shaped steel lower chord and support bar, shaped steel column is fixed with between support bar, the shaped steel crossbeam be fixed together with support bar is fixed with between shaped steel column.
Bracing or strutting arrangement comprises shaped steel lower chord, support bar, shaped steel web member and steel strand bearing, the outside that shaped steel lower chord and shaped steel enclose purlin is fixed together, at least three support bars are fixed with at the outside spacers of shaped steel lower chord, and the support bar height in middle part to direction, both sides sequentially reduces, each support bar is installed with steel strand bearing, steel strand are positioned at steel strand bearing, shaped steel web member is fixed with between shaped steel lower chord and support bar, shaped steel column is fixed with between support bar, the shaped steel crossbeam be fixed together with support bar is fixed with between shaped steel column.
Bracing or strutting arrangement comprises shaped steel lower chord, support bar, shaped steel web member and steel strand bearing, the outside that shaped steel lower chord and shaped steel enclose purlin is fixed together, at least three support bars are fixed with at the outside spacers of shaped steel lower chord, and the support bar height in middle part to direction, both sides sequentially reduces, each support bar is installed with steel strand bearing, steel strand are positioned at steel strand bearing, shaped steel web member is fixed with between shaped steel lower chord and support bar, shaped steel column is fixed with between support bar, the shaped steel crossbeam be fixed together with support bar is fixed with between shaped steel column.
The beneficial effects of the utility model are: horizontal reinforcement concrete support structure have good integrity, rigidity high, can model good, be easy to the features such as construction, fish belly sill bracing or strutting arrangement has peace and tears simple and fast, recyclable recycling open, repeatedly can apply the features such as pre-applied force.The utility model is effectively in conjunction with the advantage of the two, especially can be applicable to complex plane foundation ditch, wherein the limit of out-of-shape, stressed complexity, node adopt horizontal reinforcement concrete support structure (angle brace, to support), other a safe edge can adopt the fish belly sill bracing or strutting arrangement of different spans, the utility model can ensure safety, reliability, also supporting and protection structure can be made to be easy to construction, meanwhile, to be conducive to the soil excavation in place in the middle part of foundation ditch and the construction of middle part high building.The utility model eliminates steel strand anchorage device base, and steel strand are directly anchored in horizontal reinforcement concrete support structure.Therefore, braced structures is constructed without Integral synchronous, can first construction level reinforced concrete support structure, then carries out fish belly sill construction and steel strand tension locking, is conducive to bottom operation segmentation and carries out cross construction.
Accompanying drawing explanation
Fig. 1 of the present utility modelly overlooks sectional structure schematic diagram.
Fig. 2 is the top view of fish belly sill braced structures.
Fig. 3 to be collar tie beam with shaped steel enclose top view that purlin is connected.
Fig. 4 is the elevation of Fig. 3.
Fig. 5 is the left view of Fig. 3.
Fig. 6 is the top view that steel strand are connected with horizontal reinforcement concrete support structure.
Fig. 7 is the elevation of Fig. 6 when installing steel sleeve.
Coding in figure is respectively: 1 is steel sleeve, and 2 is horizontal reinforcement concrete support structure, and 3 is vertical supporting and protection structure, 4 is collar tie beam, and 5 is support post, and 6 enclose purlin for shaped steel, 7 is steel strand, and 8 is stone bolt, and 9 is steel strand preformed hole, 10 is shaped steel crossbeam, and 11 is porous anchor, and 12 is billet, 13 is shaped steel lower chord, and 14 is support bar, and 15 is shaped steel web member, 16 is steel strand bearing, and 17 is shaped steel column, and 18 for strengthening arrangement of reinforcement.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearly, will be described in detail the technical solution of the utility model below.Obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belong to the scope that the utility model is protected.
As shown in Fig. 1 to 7, the utility model provides a kind of reinforced concrete beam for complex plane foundation ditch and fish belly sill integral supporting structure, comprises along the spaced vertical supporting and protection structure 3 of complicated margin of foundation pit, horizontal reinforcement concrete support structure 2 and fish belly sill braced structures, the above-below direction of vertical supporting and protection structure 3 is fixed with the collar tie beam 4 of at least one deck, the horizontal reinforcement concrete support structure 2 how group is fixed together with collar tie beam 4 is provided with at vertical supporting and protection structure 3 clear width, support post 5 is installed with at the interval, bottom of horizontal reinforcement concrete support structure 2, the fish belly sill braced structures corresponding with it is provided with between at least one adjacent level reinforced concrete support structure 2, fish belly sill braced structures comprises shaped steel and encloses purlin 6, bracing or strutting arrangement and steel strand 7, inside collar tie beam 4, be fixed with shaped steel enclose purlin 6, enclose inside purlin 6 at shaped steel and be fixed with bracing or strutting arrangement, steel strand 7 are provided with in the inner side of bracing or strutting arrangement, the two ends of steel strand 7 are separately fixed in the horizontal reinforcement concrete support structure 2 of both sides.Horizontal reinforcement concrete support structure 2 is existing known technology, and it can adopt the reinforced concrete beam of at least one deck to be formed by connecting.Horizontal reinforcement concrete support structure 2 have good integrity, rigidity high, can model good, be easy to the features such as construction, fish belly sill bracing or strutting arrangement has peace and tears simple and fast, recyclable recycling open, repeatedly can apply the features such as pre-applied force.The utility model is effectively in conjunction with the advantage of the two, especially can be applicable to complex plane foundation ditch, wherein the limit of out-of-shape, stressed complexity, node adopt horizontal reinforcement concrete support structure 2 (angle brace, to support), other a safe edge can adopt the fish belly sill bracing or strutting arrangement of different spans, this braced structures can ensure safety, reliability, also supporting and protection structure can be made to be easy to construction, meanwhile, to be conducive to the construction of the soil excavation in the middle part of foundation ditch etc.Have good integrity, rigidity high, can model good, be easy to the features such as construction, fish belly sill braced structures has peace and tears simple and fast, recyclable recycling open, repeatedly can apply the features such as pre-applied force.
As required, horizontal reinforcement concrete support structure 2 vertically supporting and protection structure 3 is provided with at least two layers from top to bottom, between at least one adjacent level reinforced concrete support structure 2, be provided with the fish belly sill braced structures corresponding with its number of plies.When foundation ditch is darker, needs to arrange multiple-layer horizontal reinforced concrete support structure 2 and fish belly sill braced structures, can support strength be increased like this.
As shown in accompanying drawing 3 to 6, for the ease of installation and removal, the inner side of collar tie beam 4 is installed with two row's stone bolt 8 from top to bottom, and shaped steel is enclosed purlin 6 and is fixedly mounted on inside collar tie beam 4 by stone bolt 8 and nut.
As shown in Figure 5, for the ease of installation and removal, the horizontal reinforcement concrete support structure 2 of steel strand 7 both sides is respectively equipped with steel strand preformed hole 9, have steel sleeve 1 at steel strand preformed hole 9 internal fixtion, the two ends of steel strand 7 are each passed through steel sleeve 1 and are fixedly mounted in horizontal reinforcement concrete support structure 2 by porous anchor 11.
As shown in Figure 7, horizontal reinforcement concrete support structure 2 internal fixtion outside steel strand preformed hole 9 has level and vertical and oblique reinforcement arrangement of reinforcement 18.The intensity of steel strand preformed hole 9 place horizontal reinforcement concrete support structure 2 can be increased like this.
As shown in Figure 5, in order to increase stability, between porous anchor 11 and steel sleeve 1, be provided with billet 12.
As shown in Figure 2, bracing or strutting arrangement comprises shaped steel lower chord 13, support bar 14, shaped steel web member 15 and steel strand bearing 16, the outside that shaped steel lower chord 13 and shaped steel enclose purlin 6 is fixed together, at least three support bars 14 are fixed with at the outside spacers of shaped steel lower chord 13, and the support bar 14 in middle part to direction, both sides highly sequentially reduces, each support bar 14 is installed with steel strand bearing 16, steel strand 7 are positioned at steel strand bearing 16, shaped steel web member 15 is fixed with between shaped steel lower chord 13 and support bar 14, shaped steel column 17 is fixed with between support bar 14, the shaped steel crossbeam 10 be fixed together with support bar 14 is fixed with between shaped steel column 17.Conventional fish belly sill braced structures two ends arrange steel strand anchorage device base, and it is welded by shaped steel and steel plate combination, and volume is large, requirement on machining accuracy is high.The utility model eliminates steel strand anchorage device base, and steel strand 7 are directly anchored in horizontal reinforcement concrete support structure 2.Therefore, braced structures is constructed without Integral synchronous, can first construction level reinforced concrete support structure 2, then carries out fish belly sill construction and steel strand 7 tensioning fixation, is conducive to bottom operation segmentation and carries out cross construction.Braced structures also can adopt the steel work fish belly sill of the patent No. for adopting in 201320454220.2.
The above; be only detailed description of the invention of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; change can be expected easily or replace, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should described be as the criterion with the protection domain of claim.
Claims (10)
1., for reinforced concrete beam and the fish belly sill integral supporting structure of complex plane foundation ditch, it is characterized in that comprising along the spaced vertical supporting and protection structure of complicated margin of foundation pit, horizontal reinforcement concrete support structure and fish belly sill braced structures, one deck collar tie beam is fixed with at the top of vertical supporting and protection structure, the above-below direction of vertical supporting and protection structure is fixed with the collar tie beam of at least one deck, the horizontal reinforcement concrete support structure how group is fixed together with collar tie beam is provided with at vertical supporting and protection structure clear width, support post is installed with at the interval, bottom of horizontal reinforcement concrete support structure, the fish belly sill braced structures corresponding with it is provided with between at least one adjacent level reinforced concrete support structure, fish belly sill braced structures comprises shaped steel and encloses purlin, bracing or strutting arrangement and steel strand, inside collar tie beam, be fixed with shaped steel enclose purlin, enclose inside purlin at shaped steel and be fixed with bracing or strutting arrangement, steel strand are provided with in the inner side of bracing or strutting arrangement, the two ends of steel strand are separately fixed in the horizontal reinforcement concrete support structure of both sides.
2. the reinforced concrete beam for complex plane foundation ditch according to claim 1 and fish belly sill integral supporting structure, it is characterized in that horizontal reinforcement concrete support structure vertically supporting and protection structure be provided with at least two layers from top to bottom, between at least one adjacent level reinforced concrete support structure, be provided with the fish belly sill braced structures corresponding with its number of plies.
3. the reinforced concrete beam for complex plane foundation ditch according to claim 1 and 2 and fish belly sill integral supporting structure, it is characterized in that the inner side of collar tie beam is installed with two row's stone bolt from top to bottom, shaped steel is enclosed purlin and is fixedly mounted on inside collar tie beam by stone bolt and nut.
4. the reinforced concrete beam for complex plane foundation ditch according to claim 1 and 2 and fish belly sill integral supporting structure, the horizontal reinforcement concrete support structure that it is characterized in that steel strand both sides is respectively equipped with steel strand preformed hole, have steel sleeve at steel strand preformed hole internal fixtion, the two ends of steel strand are each passed through steel sleeve and are fixedly mounted in horizontal reinforcement concrete support structure by porous anchor.
5. the reinforced concrete beam for complex plane foundation ditch according to claim 3 and fish belly sill integral supporting structure, the horizontal reinforcement concrete support structure that it is characterized in that steel strand both sides is respectively equipped with steel strand preformed hole, have steel sleeve at steel strand preformed hole internal fixtion, the two ends of steel strand are each passed through steel sleeve and are fixedly mounted in horizontal reinforcement concrete support structure by porous anchor.
6. the reinforced concrete beam for complex plane foundation ditch according to claim 4 and fish belly sill integral supporting structure, it is characterized in that the horizontal reinforcement concrete support structure internal fixtion outside steel strand preformed hole has level and vertical and oblique reinforcement arrangement of reinforcement, or/and, be provided with billet between porous anchor and steel sleeve.
7. the reinforced concrete beam for complex plane foundation ditch according to claim 1 and 2 and fish belly sill integral supporting structure, it is characterized in that bracing or strutting arrangement comprises shaped steel lower chord, support bar, shaped steel web member and steel strand bearing, the outside that shaped steel lower chord and shaped steel enclose purlin is fixed together, at least three support bars are fixed with at the outside spacers of shaped steel lower chord, and the support bar height in middle part to direction, both sides sequentially reduces, each support bar is installed with steel strand bearing, steel strand are positioned at steel strand bearing, shaped steel web member is fixed with between shaped steel lower chord and support bar, shaped steel column is fixed with between support bar, the shaped steel crossbeam be fixed together with support bar is fixed with between shaped steel column.
8. the reinforced concrete beam for complex plane foundation ditch according to claim 3 and fish belly sill integral supporting structure, it is characterized in that bracing or strutting arrangement comprises shaped steel lower chord, support bar, shaped steel web member and steel strand bearing, the outside that shaped steel lower chord and shaped steel enclose purlin is fixed together, at least three support bars are fixed with at the outside spacers of shaped steel lower chord, and the support bar height in middle part to direction, both sides sequentially reduces, each support bar is installed with steel strand bearing, steel strand are positioned at steel strand bearing, shaped steel web member is fixed with between shaped steel lower chord and support bar, shaped steel column is fixed with between support bar, the shaped steel crossbeam be fixed together with support bar is fixed with between shaped steel column.
9. the reinforced concrete beam for complex plane foundation ditch according to claim 6 and fish belly sill integral supporting structure, it is characterized in that bracing or strutting arrangement comprises shaped steel lower chord, support bar, shaped steel web member and steel strand bearing, the outside that shaped steel lower chord and shaped steel enclose purlin is fixed together, at least three support bars are fixed with at the outside spacers of shaped steel lower chord, and the support bar height in middle part to direction, both sides sequentially reduces, each support bar is installed with steel strand bearing, steel strand are positioned at steel strand bearing, shaped steel web member is fixed with between shaped steel lower chord and support bar, shaped steel column is fixed with between support bar, the shaped steel crossbeam be fixed together with support bar is fixed with between shaped steel column.
10. the reinforced concrete beam for complex plane foundation ditch according to claim 6 and fish belly sill integral supporting structure, it is characterized in that bracing or strutting arrangement comprises shaped steel lower chord, support bar, shaped steel web member and steel strand bearing, the outside that shaped steel lower chord and shaped steel enclose purlin is fixed together, at least three support bars are fixed with at the outside spacers of shaped steel lower chord, and the support bar height in middle part to direction, both sides sequentially reduces, each support bar is installed with steel strand bearing, steel strand are positioned at steel strand bearing, shaped steel web member is fixed with between shaped steel lower chord and support bar, shaped steel column is fixed with between support bar, the shaped steel crossbeam be fixed together with support bar is fixed with between shaped steel column.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520524789.0U CN204825914U (en) | 2015-07-17 | 2015-07-17 | A reinforced concrete roof beam and fish belly sill combined supporting structure for complicated plane foundation ditch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520524789.0U CN204825914U (en) | 2015-07-17 | 2015-07-17 | A reinforced concrete roof beam and fish belly sill combined supporting structure for complicated plane foundation ditch |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109972631A (en) * | 2019-04-08 | 2019-07-05 | 桂林理工大学 | A kind of facade inner support is applied to the supporting construction of foundation pit |
| CN110424411A (en) * | 2019-08-27 | 2019-11-08 | 南京市测绘勘察研究院股份有限公司 | A kind of irregular foundation pit assembled steel support device and its construction and application method |
| CN113914325A (en) * | 2021-10-26 | 2022-01-11 | 江苏东合南岩土科技股份有限公司 | Horizontal support system and construction method thereof |
| CN116305499A (en) * | 2023-05-18 | 2023-06-23 | 中国矿业大学(北京) | Plane layout method and device based on prestress fish belly type steel support system |
-
2015
- 2015-07-17 CN CN201520524789.0U patent/CN204825914U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109972631A (en) * | 2019-04-08 | 2019-07-05 | 桂林理工大学 | A kind of facade inner support is applied to the supporting construction of foundation pit |
| CN110424411A (en) * | 2019-08-27 | 2019-11-08 | 南京市测绘勘察研究院股份有限公司 | A kind of irregular foundation pit assembled steel support device and its construction and application method |
| CN113914325A (en) * | 2021-10-26 | 2022-01-11 | 江苏东合南岩土科技股份有限公司 | Horizontal support system and construction method thereof |
| CN113914325B (en) * | 2021-10-26 | 2023-01-31 | 江苏东合南岩土科技股份有限公司 | Horizontal support system and construction method thereof |
| CN116305499A (en) * | 2023-05-18 | 2023-06-23 | 中国矿业大学(北京) | Plane layout method and device based on prestress fish belly type steel support system |
| CN116305499B (en) * | 2023-05-18 | 2023-07-21 | 中国矿业大学(北京) | Plane layout method and device based on prestress fish belly type steel support system |
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