CN103374916A - Pre-pressure steel arch foundation pit supporting structure - Google Patents
Pre-pressure steel arch foundation pit supporting structure Download PDFInfo
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- CN103374916A CN103374916A CN201310335655XA CN201310335655A CN103374916A CN 103374916 A CN103374916 A CN 103374916A CN 201310335655X A CN201310335655X A CN 201310335655XA CN 201310335655 A CN201310335655 A CN 201310335655A CN 103374916 A CN103374916 A CN 103374916A
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- precompression
- foundation pit
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Abstract
The invention discloses a pre-pressure steel arch foundation pit supporting structure which comprises an outer chord member with a bearing frame fixedly connected at each of two ends. Multiple vertical web members and inclined web members are fixedly mounted at the bottom of the outer chord member, multiple inner chord members are sequentially and fixedly connected and fixedly connected with the other ends of the vertical web members and the inclined web members, reinforcing ribs are mounted at the joints, the vertical web members are fixedly connected with a broken-line-achy pre-pressure arch, the pre-pressure arch is fixedly connected with vertical supporting uprights, and a jack is mounted at one end of the pre-pressure arch. Through the jack, pressure is generated in the pre-pressure arch and reversely pushes the outer side of a steel truss composed of the outer chord member, the vertical web members, the inclined web members and the inner chord members to enable the steel truss to reversely deform to offset an internal force generated by the steel truss under the action of pressure of outer-side soil so as to cause almost zero deformation or only small deformation of a foundation pit wall, so that stability of surrounding building places is guaranteed. The pre-pressure steel arch foundation pit supporting structure has the advantages of good stability, demountability, convenience for transporting and reusability.
Description
Technical fieldThe present invention relates to the building foundation engineering technical field, relate in particular to a kind of precompression steel arch foundation pit supporting construction (Prestressed Arched Structures is called for short PAS).
Background technologyAlong with the development of urbanization, highrise building is more and more, and is more and more stronger to the underground demand in space of wanting.Multiple material handling method of deep foundation pit becomes a fast-developing field.Base hole supporting technology has determined speed and the cost of basis and basement construction.The demand of reality is: Base hole supporting technology not only will be protected the stable of the safety of existing building on every side and place, road; also wanting simultaneously can be that large as far as possible accessible construction space is created in the basis of proposed building and the construction of basement, and the building machinery of being convenient to enter foundation ditch can carry out construction operation freely.
Precompression steel arch foundation pit supporting construction is foundation ditch and deep foundation pit support effective technology, and the precompression arch makes foundation pit walls inside inclination not occur so that foundation pit walls produces reverse distortion, protects the stable of Adjacent Buildings basis and road, place.It is applicable to shallow foundation hole and deep foundation ditch, is applicable to various foundation soils, the pattern foundation pit supporting structure of especially various clay foundations.
The purpose of precompression arch is set, by applying precompression, so that the special steel truss produces the distortion towards the foundation pit walls direction, the power that precompression produces in each member of special steel truss, be applied to the internal force that the soil pressure on the special steel truss produces with foundation pit walls, cancel out each other, reduced like this internal force of each rod member of special steel truss, so that the applicable span of steel truss increases, greatly increased the area of clear area in the foundation ditch.
Other support technologies, for example campshed, underground concrete diaphragm wall, the applicable degree of depth is limited, and cost is high, and speed is slow, reverse construction, not only speed is slow, and the space that can offer building machinery is also very little.Therefore in the urgent need to new steel work technology.
For so that above-mentioned and the matching used lateral resistant member of steel work are born vertical load as small as possible, often require these members total be installed to top, most vertical load all put in place be delivered on the pillar after, turn back again to install these lateral resistant member.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of precompression steel arch foundation pit supporting construction is provided.
The objective of the invention is to be achieved through the following technical solutions: a kind of precompression steel arch foundation pit supporting construction, it comprises outer chord member, perpendicular web member, diagonal web member, interior chord member, the first pressure-bearing bracket, precompression arch, the second pressure-bearing bracket, vertical support column and heavy frame etc.; The two ends of outer chord member respectively are fixedly connected with a heavy frame, and the bottom of outer chord member fixedly mounts a plurality of perpendicular web members and diagonal web member; A plurality of interior chord members are fixedly connected sequentially, and are the broken line arch, and are fixedly connected with the other end of all perpendicular web members and diagonal web member, and stiffening rib is installed in the junction.Perpendicular web member is fixedly connected with the precompression arch that is the broken line arch by perpendicular web member end plate; The precompression arch is fixedly connected with the vertical supporting column by the vertical support upright post connecting plate; One end of precompression arch is fixedly connected with the first pressure-bearing bracket, and the first pressure-bearing bracket is installed on the heavy frame of outer chord member one side.The other end of precompression arch is installed jack, and jack up and down position is installed the overlap joint lintel.The other end of jack is fixedly connected with the second pressure-bearing bracket, and the second pressure-bearing bracket is installed on the heavy frame of outer chord member opposite side.
The beneficial effect that the present invention compared with prior art has:
1, because adopt special steel truss with bolts, can reuse, disposable input according to a preliminary estimate can repeated application up to a hundred times, and cost greatly reduces.2, adopt the precompression arch, the special steel truss is applied the pressure reverse with soil pressure, make that truss is stressed to be reduced, applicable span increases, and is the larger clear space of construction creation of basis and basement.3, adopt steel work, installing at once can be stressed, compares with concrete supporting structure and can save the plenty of time, accelerating construction progress.
4, power steel precompressed skewback pit supporting construction of the present invention, have good stability, detachable, be convenient to transportation, reusable characteristics.
Description of drawingsFig. 1 is the structural representation of precompression steel arch foundation pit supporting construction of the present invention.
Fig. 2 is the a-quadrant enlarged drawing of Fig. 1;
Fig. 3 is the B regional enlarged drawing of Fig. 1;
Fig. 4 is the C regional enlarged drawing of Fig. 1;
Fig. 5 is the D regional enlarged drawing of Fig. 1;
Fig. 6 is the E regional enlarged drawing of Fig. 1;
Fig. 7 is the A-A view of Fig. 1;
Fig. 8 is the B-B view of Fig. 1;
Fig. 9 is the F regional enlarged drawing of Fig. 8;
Figure 10 is the C-C view of Fig. 1;
Figure 11 is the D-D view of Fig. 3;
Figure 12 is the E-E view of Fig. 9;
Figure 13 is the F-F view of Fig. 9;
Among the figure, outer chord member 1, perpendicular web member 2, diagonal web member 3, interior chord member 4, the first pressure-bearing bracket 5, stiffening rib 6, bolt 7, perpendicular web member end plate 8, horizontal slotted hole 9, precompression arch 10, bolt 11, vertical support upright post connecting plate 12, bolt 13, bolt 14, the second pressure-bearing bracket 15, bolt 16, vertical supporting column 17, jack 18, overlap joint lintel 19, bolt 20, heavy frame 21.
The specific embodiment
Shown in Fig. 1-13, precompression steel arch foundation pit supporting construction of the present invention comprises outer chord member 1, perpendicular web member 2, diagonal web member 3, interior chord member 4, the first pressure-bearing bracket 5, precompression arch the 10, second pressure-bearing bracket 15, vertical support column 17 and heavy frame 21.The two ends of outer chord member 1 respectively are fixedly connected with a heavy frame 21, and the bottom of outer chord member 1 fixedly mounts a plurality of perpendicular web members 2 and diagonal web member 3; A plurality of interior chord members 4 are fixedly connected sequentially, and are the broken line arch, and are fixedly connected with the other end of perpendicular web member 2 and diagonal web member 3, and stiffening rib 6 is installed in the junction.Perpendicular web member end plate 8 has been welded in perpendicular web member 2 ends, the flat slotted hole 9 of boiling water on the perpendicular web member end plate 8.All perpendicular web member end plates 8 all are fixedly connected with the precompression arch 10 that is the broken line arch.Precompression arch 10 is fixedly connected with vertical supporting column 17 by vertical support upright post connecting plate 12.One end of precompression arch 10 is fixedly connected with the first pressure-bearing bracket 5, the first pressure-bearing brackets and is installed on the heavy frame 21 of outer chord member 1 one sides.The other end of precompression arch 10 is installed jack 18, and jack is installed overlap joint lintel 19 in the position about in the of 18.The other end of jack 18 is fixedly connected with the second pressure-bearing bracket 15, the second pressure-bearing brackets 15 and is installed on the heavy frame 21 of outer chord member 1 opposite side.
The implementation step of precompression steel arch foundation pit supporting construction of the present invention is as follows:
1, foundation ditch tentatively excavates certain degree of depth, for precompression steel arch foundation pit supporting construction and peripheral frame vacating space are installed;
2, heavy frame 21 and vertical support column 17 are installed;
3, outer chord member 1 is installed;
4, block-by-block is installed chord member 4 in perpendicular web member 2, diagonal web member 3, the fold-line-shaped;
5, precompression arch 10 is installed: precompression arch 10 is connected with the vertical support column with perpendicular web member 2 reliably is connected;
6, jack 18 is installed; And layout monitoring equipment;
7, utilize jack 18 to apply precompression, first preliminary pressure testing is about 20% to design load, checks total, and reads monitored data, checks whether data are normal;
8, apply step by step precompression, reading checks, until the precompression of design code step by step;
9, tighten all bolts to the bolt pretension of regulation, and the up and down steel lintel 19 at position of jack is installed;
10, close jack 18 fuel taps.And the pressure of continuation monitoring jack sensor;
11, the foundation ditch excacation can continue to carry out downwards, carries out after the degree of depth of design code, and new Pin precompression arch supporting and protection structure is installed.Continue, until the foundation depth that needs.
The present invention is by jack 18; make precompression encircle 10 interior generation pressure; the steel truss that is formed by outer chord member 1, perpendicular web member 2, diagonal web member 3 and interior chord member 4 outside counter the pushing away; make steel truss produce reversal deformation; offset the internal force that produces under the outside lateral earth pressure effect of steel truss; so that the distortion of foundation pit walls occurs hardly or a small amount of distortion only occurs, thus the stability in protection surrounding buildings place.
Claims (1)
1. a precompression steel arch foundation pit supporting construction is characterized in that, it comprises outer chord member, perpendicular web member, diagonal web member, interior chord member, the first pressure-bearing bracket, precompression arch, the second pressure-bearing bracket, vertical support column and heavy frame etc.; The two ends of outer chord member respectively are fixedly connected with a heavy frame, and the bottom of outer chord member fixedly mounts a plurality of perpendicular web members and diagonal web member; A plurality of interior chord members are fixedly connected sequentially, and are the broken line arch, and are fixedly connected with the other end of all perpendicular web members and diagonal web member, and stiffening rib is installed in the junction; Perpendicular web member is fixedly connected with the precompression arch that is the broken line arch by perpendicular web member end plate; The precompression arch is fixedly connected with the vertical supporting column by the vertical support upright post connecting plate; One end of precompression arch is fixedly connected with the first pressure-bearing bracket, and the first pressure-bearing bracket is installed on the heavy frame of outer chord member one side; The other end of precompression arch is installed jack, and jack up and down position is installed the overlap joint lintel; The other end of jack is fixedly connected with the second pressure-bearing bracket, and the second pressure-bearing bracket is installed on the heavy frame of outer chord member opposite side.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310335655.XA CN103374916B (en) | 2013-08-05 | 2013-08-05 | Pre-pressure steel arch foundation pit supporting construction |
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| CN201310335655.XA CN103374916B (en) | 2013-08-05 | 2013-08-05 | Pre-pressure steel arch foundation pit supporting construction |
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| CN103374916A true CN103374916A (en) | 2013-10-30 |
| CN103374916B CN103374916B (en) | 2015-08-12 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100543059B1 (en) * | 2004-07-26 | 2006-01-20 | (주)피에스테크 | A wale system for supporting earth retaining wall and construction method thereof |
| CN101255697A (en) * | 2008-04-10 | 2008-09-03 | 王平 | Deep building pit trussed-beam inner support integral application pre-stress method |
| CN101408024A (en) * | 2008-11-11 | 2009-04-15 | 广州市设计院 | Undercrossing subway tunnel pit supporting and protecting structure of high-rise building or super high-rise building |
| CN202157328U (en) * | 2011-07-11 | 2012-03-07 | 福建工大建筑设计院 | Steel truss type foundation pit supporting structure |
-
2013
- 2013-08-05 CN CN201310335655.XA patent/CN103374916B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100543059B1 (en) * | 2004-07-26 | 2006-01-20 | (주)피에스테크 | A wale system for supporting earth retaining wall and construction method thereof |
| CN101255697A (en) * | 2008-04-10 | 2008-09-03 | 王平 | Deep building pit trussed-beam inner support integral application pre-stress method |
| CN101408024A (en) * | 2008-11-11 | 2009-04-15 | 广州市设计院 | Undercrossing subway tunnel pit supporting and protecting structure of high-rise building or super high-rise building |
| 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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| CN103374916B (en) | 2015-08-12 |
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Address after: 310016 Room 1101, 6 Blocks, Chuangzhi Green Valley Development Center, Jianggan District, Hangzhou City, Zhejiang Province Co-patentee after: Zhejiang University Patentee after: Dongtong Geotechnical Technology Co., Ltd. Address before: 2, No. 1199, No. 310016, sailing Road, Hangzhou, Zhejiang, Jianggan District Co-patentee before: Zhejiang University Patentee before: Dongtong Geotechnical Technology (Hangzhou) Co., Ltd. |
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