CN203866843U - Supporting structure of large foundation pit - Google Patents
Supporting structure of large foundation pit Download PDFInfo
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- CN203866843U CN203866843U CN201420153416.2U CN201420153416U CN203866843U CN 203866843 U CN203866843 U CN 203866843U CN 201420153416 U CN201420153416 U CN 201420153416U CN 203866843 U CN203866843 U CN 203866843U
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- foundation pit
- swivel becket
- supporting
- column
- connecting bushing
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Abstract
The utility model discloses a supporting structure of a large foundation pit. The supporting structure comprises bored concrete piles and first purline beams, wherein the bored concrete piles are arranged on the periphery of the foundation pit, and the first purline beams are connected to the inner sides of the upper ends of the bored concrete piles. A horizontal supporting beam which bends downwards in an arc shape is arranged between the first purline beams on the two opposite sides of the foundation pit. The lower side of the horizontal supporting beam is connected with a plurality of stand columns at intervals. Butting supporting mechanisms are arranged between the horizontal supporting beam and the stand columns. The lower ends of the stand columns are buried in a soil layer underneath a foundation pit bottom plate. Corner supporting beams are connected between the adjacent first purline beams at the corners of the foundation pit. According to the supporting structure, the supporting strength of the large foundation pit can be remarkably enhanced, and the construction cost of a supporting system is lowered.
Description
Technical field
The utility model relates to building structure technology field, is specifically related to a kind of supporting and protection structure of Large Foundation Pit sidewall.
Background technology
When construction has the building of subterranean layer, first need to excavate a foundation ditch, and build base plate in the bottom of foundation ditch, then build corresponding subterranean layer structure.Because the degree of depth of foundation ditch has tens meters conventionally, thereby need to carry out supporting to the sidewall of foundation ditch, common foundation pit supporting method is hole in advance and form castinplace pile in a row around the edge of foundation ditch, then in the inner side of castinplace pile upper end, connect and enclose purlin beam, then with horizontal shore the relative both sides of foundation ditch are enclosed to purlin beam to propping up.Yet for some large-scale buildings, there is a problem in this supporting method, because the distance between the relative both sides of foundation ditch is larger, thereby the length of horizontal shore is very long, easily there is flexural deformation in horizontal shore correspondingly, thereby need to have very large cross section, to guarantee that horizontal shore has enough strength and stiffness, thereby increase cost.
Disclosed in Chinese patent literature " a kind of detachable prestressing force bracing frame system ", notification number is CN103161168A, it comprises around one group of engineering method stake of margin of foundation pit setting and is positioned at the cold beam that encloses of engineering method stake inner side, encloses cold beam inner side and be provided with some gusseted parts; Be arranged in foundation ditch cave in corner be provided with angle to support beam, and this angle to support beam be arranged between two triangle support members of the adjacent both sides of recessed corners; Angle is resisted against on one of them gusseted part side one end of support beam, between the other end and another gusseted part, is provided with prestressing force reservation member; This prestressing force reservation member comprises two support components that can mutually strut, and wherein a support component is connected on gusseted part side, another support component is connected to angle in support beam end, has at least part to be provided with some groups of stiffening girders to support mechanism in foundation ditch between the cold beam of enclosing of relative both sides.The all mistakes of this support frame arrange angle to support beam in the corner of foundation ditch, thereby form a triangular structure, to increase the structural stability of bracing frame system.Yet this bracing frame system still needs to arrange horizontal shore enclosing of the relative both sides, centre of foundation ditch between cold beam, thereby cannot avoid causing because horizontal shore is long its easily distortion and then increase the problem of construction cost.
Utility model content
An object of the present utility model is to solve the problem that the existing horizontal shore of existing Large Foundation Pit supporting and protection structure is easily out of shape, construction cost is high, a kind of supporting and protection structure of Large Foundation Pit is provided, can improve the standard significantly intensity and the rigidity of brace summer, to reduce its construction cost.
To achieve these goals, the utility model is by the following technical solutions: a kind of supporting and protection structure of Large Foundation Pit, comprise the castinplace pile arranging around margin of foundation pit, be connected to first of inner side, castinplace pile upper end and enclose purlin beam, in first of the relative both sides of foundation ditch, enclose the horizontal shore that is provided with downward arc-shaped bend between purlin beam, the downside compartment of terrain of horizontal shore is connected with some columns, between horizontal shore and column, be provided with support mechanism, the lower end of column is embedded in the soil layer below base plate of foundation pit, in adjacent first of foundation ditch corner, enclose and between purlin beam, be connected with corner supports beam.
First, the utility model encloses and between purlin beam, is connected with corner supports beam in adjacent first of foundation ditch corner, thereby makes first to enclose the shorter side of purlin beam and can effectively be supported, and is conducive to shorten the length of corner supports beam simultaneously, guarantees its intensity and rigidity.Secondly, different with prior art is, horizontal shore of the present utility model is downward arc-shaped bend, thereby when being subject to axial pressure only can original be bent downwardly on basis further crooked, and can be not crooked arbitrarily to other direction, make the deformation direction of horizontal shore be able to effective control.And then by column do directly to support, make horizontal shore when being subject to axial compression, there is reliable rigidity, avoid it to be bent downwardly further.Due to the thrust of column change into horizontal shore to support force time there is an amplification, thereby the stressed of column reduced significantly, be conducive to reduce the cross sectional dimensions of column and be embedded in the degree of depth in soil layer below base plate of foundation pit.Especially, by jack one class, to support mechanism, make the horizontal shore of downward arc-shaped bend be subject to the thrust making progress, horizontal shore now forms the robust construction of a similar arch bridge, the thrust simultaneously making progress be transformed into horizontal shore two end axles to support force, make horizontal shore in tensioning state, improved widely rigidity and intensity.Thereby guaranteeing that foundation ditch obtains reducing significantly under the prerequisite of effective support the construction cost of supporting and protection structure.
As preferably, describedly support mechanism is comprised to the feed screw nut who is fixed on column upper end, be threaded in vertically on feed screw nut to strut, and the connecting bushing that is fixed on horizontal shore downside, the medial surface of connecting bushing is sphere, one swivel becket fits in connecting bushing, swivel becket lateral surface is the sphere with connecting bushing medial surface adaptation, the centre of sphere of swivel becket lateral surface is positioned at the centre position of swivel becket height, thereby make swivel becket be small in ends, cydariform broad in the middle, the center of swivel becket is provided with polygonal hole, strut upper end is fitted in the polygonal hole of swivel becket, on connecting bushing, on close feed screw nut's end face, along the circumferential direction wait and be arranged with the mounting groove that two width are greater than swivel becket height, described mounting groove extends axially along connecting bushing, the lateral surface of mounting groove is the face of cylinder, and tangent with the medial surface of connecting bushing.
When rotating strut, to strut, can under feed screw nut's effect, axially move, thereby make horizontal support bar be subject to a pretightning force and in tensioning state.And swivel becket can first be inserted in connecting bushing from mounting groove when mounted vertically, and then rotate 90 and spend, making swivel becket and connecting bushing form sphere coordinates, thereby can avoid swivel becket to deviate from from connecting bushing, now rotatably to strut, make the upper end of strut progressively enter in the polygonal hole of swivel becket, to transmit the end thrust to strut.Because the fitting face of swivel becket and connecting bushing is sphere, thereby swivel becket can be done 360 degree rotations in connecting bushing, and then make the upper end of strut form being rotationally connected of 360 degree by swivel becket and connecting bushing, like this, even to thering is a small angle between strut and the axis of connecting bushing, still can guarantee to strut can be along its transfers the extruding thrust to horizontal support bar, be conducive to reduce the construction precision requirement of column and horizontal shore, and the stress surface between swivel becket and connecting bushing is sphere, thereby can improve significantly compressive strength, increase the service life.
As preferably, the lateral surface of described swivel becket is provided with some oil storage tanks that extend along warp direction, and described oil storage tank is uniformly distributed at the circumferencial direction of swivel becket.
In oil storage tank, can store lubricant grease, to provide good lubricant effect for the rotation of swivel becket.Particularly, swivel becket rotates around circumferencial direction substantially, therefore, the oil storage tank radially extending is substantially vertical with rotation direction, like this, swivel becket lubricant grease in oil storage tank when rotating is difficult for being extruded oil storage tank, and is conducive to the lubricant grease whole medial surface of lubricated connecting bushing equably.
As preferably, described column comprises the concrete column of hypomere and the steel structural upright column of epimere, described concrete column is arranged in the soil layer below base plate of foundation pit, and described steel structural upright column is made by shaped steel, and it comprises some vertical vertical rods and is connected to the bracing piece between each vertical rod.
The concrete column of column hypomere is conducive to improve the bearing capacity of column in earth, the passing through of reinforcing bar when the steel structural upright column of epimere is convenient to build the structures such as base plate, and can remove easily steel structural upright column after the construction that completes subterranean layer structure.
As preferably, castinplace pile inner side be positioned at first enclose purlin beam below be connected with second and enclose purlin beam, second, enclose the bearing diagonal beam that is provided with inclination between purlin beam and base plate of foundation pit.
When foundation ditch is darker, bearing diagonal beam can improve the supporting intensity of castinplace pile bottom, and bearing diagonal beam and horizontal shore is shorter than its length, intensity and good rigidly, and makes foundation ditch middle section have larger space, convenient construction.
Therefore, the utlity model has following beneficial effect: can improve significantly the supporting intensity of Large Foundation Pit, and reduce the construction cost of support system.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present utility model.
Fig. 2 is viewgraph of cross-section of the present utility model.
Fig. 3 is the decomposition texture schematic diagram to support mechanism in the utility model.
Fig. 4 is the sectional view to support mechanism in the utility model.
In figure: 1, castinplace pile 2, first enclose purlin beam 3, second enclose purlin beam 4, horizontal shore 5, column 51, concrete column 52, steel structural upright column 6, to support mechanism 61, feed screw nut 611, flange 62, to strut 621, linkage section 622, thread segment 623, convex shoulder 63, connecting bushing 631, mounting groove 64, swivel becket 641, oil storage tank 7, corner supports beam 8, bearing diagonal beam 9, base plate
The specific embodiment
Below in conjunction with accompanying drawing and the specific embodiment, the utility model is further described.
As shown in Figure 1 and Figure 2, a kind of supporting and protection structure of Large Foundation Pit, the shape of foundation ditch is roughly rectangle, and comprises the castinplace pile 1 arranging around margin of foundation pit, and castinplace pile can form by concrete perfusion after holing, or adopts the prior aries such as SMW engineering method stake to complete.In addition, in inner side, castinplace pile upper end, first of level is set and encloses purlin beam 2, to each castinplace pile is linked into an integrated entity.Then in first of the long relative both sides of foundation ditch, enclose the horizontal shore 4 that connects downward arc-shaped bend between purlin beam, horizontal shore can be reinforced concrete beam or the steel structure girder that forms with the shaped steel such as i iron, H shaped steel, in the downside compartment of terrain of horizontal shore, connect some columns 5 simultaneously, and between horizontal shore and column, be provided with support mechanism 6, to make horizontal shore produce a pretightning force.Further, adjacent first of our Hai Xu foundation ditch corner encloses between purlin beam and is connected with corner supports beam 7, to form a firm triangular structure.It should be noted that, we can adjust particularly according to the shape and size of foundation ditch the quantity of horizontal shore and corner supports beam.When the length of foundation ditch is longer, we can arrange two or two above horizontal shores so that reliable supporting is provided, and guarantee to have enough distances so that the normal construction of subterranean layer between adjacent horizontal shore simultaneously.When the bond length of foundation ditch is longer, we also can arrange more than two or two corner supports beams in each foundation ditch corner compartment of terrain, thereby make the minor face of foundation ditch also have reliable supporting.
For the ease of construction, column comprises the concrete column 51 of hypomere and the steel structural upright column 52 of epimere, in the base plate 9 that concrete column is wherein embedded in foundation ditch soil layer below, to produce enough support forces, steel structural upright column can be made by shaped steel such as i iron, H shaped steel, the cross section quadrate of steel structural upright column, specifically comprises four in the vertical vertical rod of edge and laterally or is obliquely connected to the bracing piece between each vertical rod.
As shown in Figure 3, Figure 4, of the present utility model to support mechanism 6 comprise be fixed on the feed screw nut 61 of column upper end, be vertically threaded on feed screw nut to strut 62 and the connecting bushing 63 that is fixed on horizontal shore downside, it to the hypomere of strut, is the thread segment 622 being connected with feed screw nut, epimere is linkage section 621, by forward and reverse rotation, to strut, can make strut rise or decline.For the ease of being connected of feed screw nut and column, we can be fixedly installed a shrouding by modes such as welding on the top of the steel structural upright column of column epimere, in feed screw nut's lower end, the flange 611 radially extending is integratedly set simultaneously, corresponding through hole is set on flange, to feed screw nut is fixed on shrouding by bolt, certainly, shrouding should arrange corresponding through hole in corresponding feed screw nut's screwed hole position, to can pass downwards from through hole strut.The medial surface of connecting bushing is sphere, in connecting bushing, there is a rotating swivel becket 64, swivel becket lateral surface is the sphere with connecting bushing medial surface adaptation, outside swivel becket, the centre of sphere of sphere is positioned at the centre position of swivel becket height, thereby make swivel becket be cydariform small in ends, broad in the middle, the center of swivel becket is provided with axial regular hexagon hole, correspondingly, cross section to the linkage section of strut epimere is regular hexagon, and this linkage section fits in the regular hexagon hole at swivel becket center.
Installation for the ease of swivel becket, we need to be on connecting bushing near on feed screw nut's end face along the circumferential direction decile the mounting groove 631 that two width are greater than swivel becket height is set, the footpath that now two mounting grooves are located opposite from connecting bushing upwards, the lateral surface of this mounting groove is the face of cylinder, and the diameter on the face of cylinder equals the diameter of sphere inside connecting bushing, the inner side of mounting groove with connecting bushing inside sphere connect, mounting groove axially extends internally along connecting bushing, until the lateral surface of mounting groove and the medial surface of connecting bushing are tangent.Like this, we can first be fixed on connecting bushing the downside of horizontal shore, then make swivel becket become vertical state, and from two relative mounting grooves, are inserted in connecting bushing vertically.When swivel becket is inserted into the inner side sphere laminating of the bottom of mounting groove and connecting bushing, swivel becket is rotated to 90 degree, make swivel becket and connecting bushing form sphere and coordinate, thereby can avoid swivel becket to deviate from from connecting bushing.Now can will be inserted in the regular hexagon hole at swivel becket center the upper end of strut, and feed screw nut is fixed on the shrouding of column.Then rotate and make it increase to strut, the upper end of strut is progressively entered in the polygonal hole of swivel becket, to transmit the end thrust to strut.Certainly, we need to arrange an orthohexagonal convex shoulder 623 to the linkage section of strut and thread segment junction, to facilitate, rotate strut, form swivel becket axially mounting simultaneously.In addition, we can arrange some oil storage tanks 641 that extend along warp direction on the lateral surface of swivel becket, each oil storage tank is uniformly distributed at the circumferencial direction of swivel becket, like this, when swivel becket rotates, lubricant grease in oil storage tank can be uniformly applied on the inner side sphere of connecting bushing, thus the frictional resistance while effectively reducing swivel becket rotation.
Further, as shown in Figure 2, we also can castinplace pile inner side be positioned at first enclose purlin beam below arrange be connected with castinplace pile second enclose purlin beam 3, and enclose second the bearing diagonal beam 8 that inclination is set between purlin beam and base plate of foundation pit.Like this, can further improve on the one hand the supporting intensity of foundation ditch, make the enough construction spaces of middle reservation of foundation ditch simultaneously.
In order to ensure remain reliable supporting in the whole work progress of foundation ditch, the utility model can adopt following construction sequence:
The first step, first arranges a circle castinplace pile at margin of foundation pit place, as previously mentioned, castinplace pile can form by concrete perfusion after holing, or adopts the prior aries such as SMW engineering method stake to complete;
Second step, holes in the position that column need to be set and pours into the concrete column of column hypomere, and the upper end of concrete column should be positioned at below the degree of depth of base plate of foundation pit, and the upper end of concrete column connects steel structural upright column.Be understandable that, because horizontal shore of the present utility model is downward arc-shaped bend, therefore, the length of the steel structural upright column of each column is difference to some extent;
The 3rd step, the top layer earthwork of excavating foundation ditch, its degree of depth should be able to be held the construction and installation of horizontal shore, and because foundation depth is now very shallow, so the sidewall of foundation ditch can merely rely on castinplace pile to realize reliable supporting;
The 4th step, arranges first in castinplace pile inner side and encloses purlin beam, then in first of the long relative both sides of foundation ditch, encloses the horizontal shore that connects downward arc-shaped bend between purlin beam, and adjacent first of Bing foundation ditch corner encloses corner supports beam is set between purlin beam.When the size of foundation ditch is larger, the quantity of horizontal shore and corner supports beam can correspondingly increase.Then connecting bushing is fixed on to the position of the corresponding column of downside of horizontal support bar, and swivel becket is inserted in connecting bushing vertically from two relative mounting grooves, until the inner side sphere laminating of the outside sphere of swivel becket and connecting bushing, now swivel becket is rotated to 90 degree, making swivel becket and connecting bushing form sphere coordinates, to the upper end of strut be inserted in the regular hexagon hole at swivel becket center again, and feed screw nut is fixed on the shrouding of column, then rotate strut is made to its rising, the upper end of strut is progressively entered in the polygonal hole of swivel becket and closely compress swivel becket stroke and connect reliably, when complete all to the connection of strut and swivel becket after, synchronously rotate again all to strut, to transmit the roughly the same end thrust to strut to horizontal shore, make horizontal shore form one to both sides the pretightning force to support, thereby form the effective support to foundation pit side-wall.Certainly, when rotating strut, we also can adopt torque wrench, so that for all set identical moment of torsion to strut, to guarantee that each produces roughly the same thrust to strut;
The 5th step, continues to excavate the earthwork in foundation ditch, and severity control, 1/2nd to 3/5ths of foundation depth, then arranges second in castinplace pile inner side and encloses purlin beam;
The 6th step, continues to excavate the earthwork to foundation ditch desired depth in the centre position of foundation ditch, and builds prefabricated panel in its bottom, thereby the periphery in foundation ditch bottom forms the sloping cob wall of a circle tool, to keep the supporting to foundation ditch bottom;
The 7th step to excavating one by one the groove of inclination in requisition for the position that bearing diagonal beam is set, and arranges seriatim and is connected to the second bearing diagonal beam enclosing between purlin beam and prefabricated panel, to form the effective support to foundation ditch bottom on cob wall in groove.Certainly, for the ease of the connection of bearing diagonal beam, we can first arrange a supporting pile for being connected with bearing diagonal beam on prefabricated panel.In addition, bearing diagonal beam also can adopt and support mechanism and second is enclosed to purlin beam be connected, to produce certain pretightning force;
The 8th step, excavate the cob wall in foundation ditch, and the position that is positioned at prefabricated panel and castinplace pile in foundation ditch bottom builds the telescopic backboard being connected with prefabricated panel, the base plate of foundation pit of telescopic backboard and prefabricated panel complete, thus complete the construction of foundation ditch and corresponding supporting and protection structure.Therefore because bearing diagonal beam has formed the effective support to foundation ditch bottom, excavate the supporting intensity that cob wall in foundation ditch can't affect foundation ditch.
Claims (5)
1. the supporting and protection structure of a Large Foundation Pit, comprise castinplace pile around margin of foundation pit setting, be connected to first of inner side, castinplace pile upper end and enclose purlin beam, it is characterized in that, in first of the relative both sides of foundation ditch, enclose the horizontal shore that is provided with downward arc-shaped bend between purlin beam, the downside compartment of terrain of horizontal shore is connected with some columns, between horizontal shore and column, be provided with support mechanism, the lower end of column is embedded in the soil layer below base plate of foundation pit, in adjacent first of foundation ditch corner, encloses and between purlin beam, is connected with corner supports beam.
2. the supporting and protection structure of a kind of Large Foundation Pit according to claim 1, it is characterized in that, describedly support mechanism is comprised to the feed screw nut who is fixed on column upper end, be threaded in vertically on feed screw nut to strut, and the connecting bushing that is fixed on horizontal shore downside, the medial surface of connecting bushing is sphere, one swivel becket fits in connecting bushing, swivel becket lateral surface is the sphere with connecting bushing medial surface adaptation, the centre of sphere of swivel becket lateral surface is positioned at the centre position of swivel becket height, thereby make swivel becket be small in ends, cydariform broad in the middle, the center of swivel becket is provided with polygonal hole, strut upper end is fitted in the polygonal hole of swivel becket, on connecting bushing, on close feed screw nut's end face, along the circumferential direction wait and be arranged with the mounting groove that two width are greater than swivel becket height, described mounting groove extends axially along connecting bushing, the lateral surface of mounting groove is the face of cylinder, and tangent with the medial surface of connecting bushing.
3. the supporting and protection structure of a kind of Large Foundation Pit according to claim 2, is characterized in that, the lateral surface of described swivel becket is provided with some oil storage tanks that extend along warp direction, and described oil storage tank is uniformly distributed at the circumferencial direction of swivel becket.
4. according to the supporting and protection structure of a kind of Large Foundation Pit described in claim 1 or 2 or 3, it is characterized in that, described column comprises the concrete column of hypomere and the steel structural upright column of epimere, described concrete column is arranged in the soil layer below base plate of foundation pit, described steel structural upright column is made by shaped steel, and it comprises some vertical vertical rods and is connected to the bracing piece between each vertical rod.
5. according to the supporting and protection structure of a kind of Large Foundation Pit described in claim 1 or 2 or 3, it is characterized in that, castinplace pile inner side be positioned at first enclose purlin beam below be connected with second and enclose purlin beam, second, enclose the bearing diagonal beam that is provided with inclination between purlin beam and base plate of foundation pit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420153416.2U CN203866843U (en) | 2014-04-01 | 2014-04-01 | Supporting structure of large foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420153416.2U CN203866843U (en) | 2014-04-01 | 2014-04-01 | Supporting structure of large foundation pit |
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| CN203866843U true CN203866843U (en) | 2014-10-08 |
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| CN201420153416.2U Expired - Fee Related CN203866843U (en) | 2014-04-01 | 2014-04-01 | Supporting structure of large foundation pit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104099934A (en) * | 2014-04-01 | 2014-10-15 | 浙江省建筑设计研究院 | Supporting structure of large foundation pit |
| CN104372797A (en) * | 2014-10-11 | 2015-02-25 | 成都聚智工业设计有限公司 | Foundation pit structure |
| CN105951847A (en) * | 2016-06-29 | 2016-09-21 | 广州市设计院 | Easy-assembly and disassembly foundation pit supporting structure and construction method |
| CN113700005A (en) * | 2021-09-27 | 2021-11-26 | 通号建设集团有限公司 | Prestressed foundation pit-free inner support system and construction method |
-
2014
- 2014-04-01 CN CN201420153416.2U patent/CN203866843U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104099934A (en) * | 2014-04-01 | 2014-10-15 | 浙江省建筑设计研究院 | Supporting structure of large foundation pit |
| CN104099934B (en) * | 2014-04-01 | 2016-01-20 | 浙江省建筑设计研究院 | A kind of supporting and protection structure of Large Foundation Pit |
| CN104372797A (en) * | 2014-10-11 | 2015-02-25 | 成都聚智工业设计有限公司 | Foundation pit structure |
| CN104372797B (en) * | 2014-10-11 | 2016-02-10 | 深圳市路桥建设集团有限公司 | Foundation pit structure |
| CN105951847A (en) * | 2016-06-29 | 2016-09-21 | 广州市设计院 | Easy-assembly and disassembly foundation pit supporting structure and construction method |
| CN113700005A (en) * | 2021-09-27 | 2021-11-26 | 通号建设集团有限公司 | Prestressed foundation pit-free inner support system and construction method |
| CN113700005B (en) * | 2021-09-27 | 2022-07-29 | 通号建设集团有限公司 | Prestressed foundation pit-free inner support system and construction method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141008 Termination date: 20170401 |