CN104099935B - Column reinforcement means after a kind of foundation pit deepened - Google Patents
Column reinforcement means after a kind of foundation pit deepened Download PDFInfo
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- CN104099935B CN104099935B CN201410128560.5A CN201410128560A CN104099935B CN 104099935 B CN104099935 B CN 104099935B CN 201410128560 A CN201410128560 A CN 201410128560A CN 104099935 B CN104099935 B CN 104099935B
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Abstract
The invention discloses the column reinforcement means after a kind of foundation pit deepened, first auxiliary strut is set at the adjacency of column, then excavates foundation ditch, and purlin beam and horizontal shore are enclosed in setting; Continue to excavate foundation ditch until arrive foundation ditch original projected depth, and arrange in the below that foundation pit side-wall encloses purlin beam and auxiliaryly enclose purlin beam and auxiliary water flat-topped ridge, the upper end of auxiliary strut is by being connected with on the downside of auxiliary water flat-topped ridge to support mechanism; Excavate the projected depth after foundation ditch to intensification, remove the column between foundation ditch bottom surface and auxiliary water flat-topped ridge, be supported between auxiliary water flat-topped ridge and the column below foundation ditch bottom surface with reinforcement post; Complete building of base plate of foundation pit, the lower end of reinforcement post is connected with base plate, then removes the auxiliary strut between base plate and auxiliary water flat-topped ridge.The present invention, without the need to again pouring into column, can guarantee the support strength of column simultaneously, and improves the supporting intensity of the foundation pit side-wall after deepening, and is conducive to reducing engineering quantity, reduces the construction cost of support system.
Description
Technical field
The present invention relates to the support technology field of foundation ditch, especially relate to the column reinforcement means after a kind of foundation pit deepened.
Background technology
When construction has the building of subterranean layer, first need excavation 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 usually, thus need to carry out supporting to the sidewall of foundation ditch, common foundation pit supporting method is holed in advance around the edge of foundation ditch and form castinplace pile in a row, then connect in the inner side of castinplace pile upper end and enclose purlin beam, then with horizontal shore relative for foundation ditch both sides are enclosed purlin beam to propping up.Such as, disclosed in Chinese patent literature " a kind of detachable pre-loaded support struts frame system ", notification number is CN103161168A, and it comprises one group of engineering method stake arranging around margin of foundation pit and is positioned at encloses cold beam inside engineering method stake, encloses inside cold beam and is 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; One end to support beam, angle is resisted against on one of them gusseted part side, is provided with prestressing force reservation member between the other end and another gusseted part; 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 in enclosing between cold beam of relative both sides and be provided with some groups of stiffening girders to support mechanism in foundation ditch.The all mistakes of this support frame arrange angle to support beam in the corner of foundation ditch, thus form a triangular structure, can increase the structural stability of bracing frame system, be conducive to reducing costs.For the foundation ditch that some are large-scale, people can arrange some columns in order to support level brace summer in the below of horizontal shore, and the part that column is positioned at below foundation ditch bottom surface needs enough length, to make column still have enough support forces after excavation of foundation pit, occur being bent downwardly phenomenon after avoiding horizontal support beam stress.
The number of plies due to subterranean layer usually there will be some and changes after going into operation; when the number of plies of local substrustion increases; we correspondingly must increase the degree of depth of foundation ditch; foundation ditch digs deeply, and the part that the column poured into is positioned at below foundation ditch bottom surface will become shorter, thus cannot meet the supporting requirement of the foundation ditch after intensification; like this; original column cannot use, and need again to pour into the column increasing the degree of depth, and then engineering quantity and construction cost are greatly increased.
Summary of the invention
The object of the invention is to the problem that the foundation pit deepened rear column solved existing for existing Large Foundation Pit supporting and protection structure again need pour into, thus increase engineering quantity and construction cost, column after a kind of foundation pit deepened reinforcement means is provided, on the one hand without the need to again pouring into column, the support strength of column can be guaranteed simultaneously, be conducive to reducing engineering quantity.
To achieve these goals, the present invention is by the following technical solutions:
A column reinforcement means after foundation pit deepened, comprises the steps:
A. at the corresponding horizontal shore place of the adjacency of every root post by hole and the mode of pouring into arranges an auxiliary strut, the degree of depth of auxiliary strut is greater than the degree of depth of column, and the upper end absolute altitude of auxiliary strut does not deepen the bottom surface absolute altitude of front original design higher than foundation ditch;
B. start to excavate foundation ditch, the castinplace pile around foundation ditch and the column in foundation ditch is made to expose soil layer, arrange and connect enclosing purlin beam and being connected to the horizontal shore enclosed between purlin beam of relative both sides of each castinplace pile, horizontal shore is connected with the upper end of each column simultaneously;
C. continue to excavate foundation ditch until arrive foundation ditch not deepen front original projected depth, the auxiliary strut in foundation ditch is made to expose soil layer, arrange in the below that foundation pit side-wall encloses purlin beam and connect the auxiliary of each castinplace pile and enclose purlin beam, the auxiliary auxiliary water flat-topped ridge enclosed between purlin beam being connected to relative both sides is set in the position of corresponding horizontal shore, auxiliary water flat-topped ridge and column become right-angled intersection to be connected, the upper end of auxiliary strut by being connected with on the downside of auxiliary water flat-topped ridge to support mechanism, thus makes auxiliary strut form the support force of a pretension to auxiliary water flat-topped ridge;
D. excavate the projected depth after foundation ditch to intensification, remove the column between foundation ditch bottom surface and auxiliary water flat-topped ridge, be again supported between auxiliary water flat-topped ridge and the column below foundation ditch bottom surface with the reinforcement post of steel work;
E. complete building of base plate of foundation pit, the lower end of reinforcement post is connected with base plate, then removes the auxiliary strut between base plate and auxiliary water flat-topped ridge, the reinforcing of column can be completed.
When needs increase one deck underground building and add deep foundation ditch, we first can pour into some auxiliary struts in soil layer, as a kind of supplemental support of column, play reinforcement effect.The degree of depth imbedded in soil layer due to auxiliary strut is greater than the degree of depth of column, therefore, can guarantee that auxiliary strut has enough support forces, because the upper end of auxiliary strut is connected with auxiliary water flat-topped ridge, and without the need to being connected with the horizontal shore of the superiors, therefore its length is much shorter than again pouring into new column, that is, its engineering quantity and cost much lower.Originally the pressure suffered by column is then delivered on auxiliary strut by the transitional function of auxiliary water flat-topped ridge, thus can meet the requirement of support.And the reinforcement post of the column steel work of concrete structure substitutes between foundation ditch bottom surface and auxiliary water flat-topped ridge, the reinforcing bar when building base plate of foundation pit can be passed easily in the middle of reinforcement post, and then make reinforcement post and base plate form firm overall structure, make the column after reinforcing have enough support forces.Particularly, auxiliary water flat-topped ridge of the present invention plays the effect that is transmitted support force on the one hand, is conducive to the supporting intensity improving the foundation pit side-wall after deepening simultaneously, improves the efficiency of whole supporting and protection structure.
As preferably, described auxiliary strut comprises the concrete column of hypomere and the steel structure column of epimere, concrete column is arranged in the soil layer below base plate of foundation pit, and steel structure column is made up of shaped steel, it bracing piece comprising some vertical vertical rods and be connected between each vertical rod.
The concrete column of auxiliary strut hypomere is conducive to guaranteeing the bearing capacity of auxiliary strut in earth, the passing through of reinforcing bar when the steel structure column of epimere is then convenient to build the structures such as base plate, and facilitates the dismounting in later stage and reuse as reinforcement post.
As preferably, describedly support mechanism is comprised to the feed screw nut being fixed on auxiliary strut upper end, be threaded in vertically on feed screw nut to strut, and the connecting bushing be fixed on the downside of auxiliary water flat-topped ridge, 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, thus make swivel becket be small in ends, cydariform broad in the middle, rotate Ring current distribution and be provided with polygonal hole, fit in the polygonal hole of swivel becket to strut upper end, connecting bushing along the circumferential direction etc. is arranged with on the end face of feed screw nut the mounting groove that two width are greater than swivel becket height, described mounting groove extends along the axis of connecting bushing, the lateral surface of mounting groove is the face of cylinder, and it is tangent with the medial surface of connecting bushing.
When rotating strut, can axially move under the effect of feed screw nut to strut, thus making horizontal support bar be subject to a pretightning force and be in tensioning state.And swivel becket can first be inserted in connecting bushing from mounting groove when mounted vertically, and then rotate 90 degree, swivel becket and connecting bushing is made to form mating spherical surfaces, thus swivel becket can be avoided to deviate from from connecting bushing, now namely rotatable to strut, make progressively to enter in the polygonal hole of swivel becket the upper end of strut, to transmit the end thrust to strut.Because the fitting face of swivel becket and connecting bushing is sphere, thus swivel becket can do 360 degree of rotations in connecting bushing, and then make to form 360 degree being rotationally connected to the upper end of strut by swivel becket and connecting bushing, like this, even if to having a small angle between strut and the axis of connecting bushing, still can guarantee can along the extruding thrust of its transfers to horizontal support bar to strut, be conducive to the construction precision requirement reducing column and horizontal shore, and the stress surface between swivel becket and connecting bushing is sphere, thus compressive strength can be improved significantly, increase the service life.
As preferably, the lateral surface of described swivel becket is provided with some oil storage tanks extended along warp direction, and described oil storage tank is uniformly distributed at the circumferencial direction of swivel becket.
Lubricant grease can be stored, to provide good lubricant effect for the rotation of swivel becket in oil storage tank.Particularly, swivel becket is that circumferentially direction is rotated substantially, therefore, the oil storage tank radially extended is substantially vertical with rotation direction, like this, the lubricant grease of swivel becket when rotating in oil storage tank is not easily extruded oil storage tank, and is conducive to the whole medial surface that lubricant grease lubricates connecting bushing equably.
Therefore, the present invention has following beneficial effect: without the need to again pouring into column, can guarantee the support strength of column simultaneously, and improves the supporting intensity of the foundation pit side-wall after deepening, and is conducive to reducing engineering quantity, reduces the construction cost of support system.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention when foundation ditch excavation depth arrives the degree of depth after deepening.
Fig. 2 is the structural representation that the present invention overlooks.
Fig. 3 is the decomposition texture schematic diagram to support mechanism in the present invention.
Fig. 4 is the sectional view to support mechanism in the present invention.
Fig. 5 is a kind of structural representation of the present invention when completing steps d.
Fig. 6 is a kind of structural representation of the present invention when completing steps e.
In figure: 1, castinplace pile 2, enclose purlin beam 3, auxiliary enclose purlin beam 4, horizontal shore 5, 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, auxiliary water flat-topped ridge 8, auxiliary strut 81, concrete column 82, steel structure column 9, base plate 10, reinforcement post.
Detailed description of the invention
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention will be further described.
As Fig. 1, shown in Fig. 2, column reinforcement means after a kind of foundation pit deepened, the column of its castinplace pile and foundation ditch inside of being applicable to margin of foundation pit completes, and foundation ditch needs the situation increasing B1 when not yet excavating, that is, column wherein and the degree of depth of castinplace pile are according to original foundation depth design perfusion, and the degree of depth that foundation ditch needs increase is roughly equivalent to the height of the B1 building newly increased, as what it will be appreciated by those skilled in the art that be, the degree of depth below foundation ditch bottom surface before column and castinplace pile are embedded in and do not deepen is greater than the height of B1 building, that is, when foundation ditch digs deeply, although column and castinplace pile can not meet the supporting requirement of the foundation ditch after intensification, but its lower end is still imbedded in the soil layer of below the foundation ditch bottom surface after intensification.The shape of the foundation ditch in the present embodiment is roughly rectangle, and specifically comprises the steps:
A. arrange an auxiliary strut 8 at corresponding horizontal shore 4 place of the adjacency of every root post 5, the degree of depth of auxiliary strut is greater than the degree of depth of column, and the upper end absolute altitude of auxiliary strut does not deepen the bottom surface absolute altitude of front original design higher than foundation ditch.Auxiliary strut can adopt holes and the mode of pouring into completes, and simultaneously for the ease of construction, the hypomere of auxiliary strut is concrete column 81, to produce enough support forces.The epimere of auxiliary strut is then steel structure column 82, and it can be made up of the shaped steel such as i iron, H profile steel, the cross section quadrate of steel structure column, specifically comprises four in the vertical vertical rod of edge and laterally or the bracing piece be connected to obliquely between each vertical rod.The concrete column of auxiliary strut and the point of interface absolute altitude of steel structure column are lower than the foundation ditch bottom surface absolute altitude after intensification;
B. the top layer soil layer excavating foundation ditch is started, the castinplace pile 1 around foundation ditch and the column in foundation ditch is made to expose soil layer, arrange and connect enclosing purlin beam 2 and being connected to the horizontal shore 4 enclosed between purlin beam of relative both sides of each castinplace pile, horizontal shore is connected with the upper end of each column simultaneously, wherein enclose purlin beam, horizontal shore preferably adopts concrete structure.It should be noted that, column preferably should adopt the segmental structure similar with auxiliary strut, its hypomere is similarly concrete column, epimere is then steel structure column, and be understandable that, the concrete column of column and the point of interface absolute altitude of steel structure column should lower than the absolute altitudes not adding deep foundation ditch bottom surface, so that together with column is cast in horizontal shore, to form reliable connection;
C. continue to excavate foundation ditch until arrive foundation ditch not deepen front original projected depth, the auxiliary strut in foundation ditch is made to expose soil layer, arrange in the below that foundation pit side-wall encloses purlin beam and connect the auxiliary of each castinplace pile and enclose purlin beam 3, the auxiliary auxiliary water flat-topped ridge 7 enclosed between purlin beam being connected to relative both sides is set in the position of corresponding horizontal shore simultaneously, auxiliary water flat-topped ridge and column become right-angled intersection to be connected, the upper end of auxiliary strut by being connected with on the downside of auxiliary water flat-topped ridge to support mechanism 6, thus makes auxiliary strut form the support force of a pretension to auxiliary water flat-topped ridge.With enclose purlin beam, horizontal shore is similar, auxiliary enclose purlin beam, auxiliary water flat-topped ridge preferably adopt concrete structure.In order to make support mechanism uniform force, as shown in Figure 3, Figure 4, of the present invention to support mechanism 6 comprise be fixed on auxiliary strut upper end feed screw nut 61, be vertically threaded on feed screw nut to strut 62 and the connecting bushing 63 that is fixed on the downside of auxiliary water flat-topped ridge, it is the thread segment 622 be connected with feed screw nut to the hypomere of strut, epimere is then linkage section 621, by forward and reverse rotation to strut, can make to rise to strut or decline.For the ease of the connection of feed screw nut and auxiliary strut, we can be fixedly installed one block of shrouding on the steel structure column top of auxiliary strut, the radial flange 611 extended integratedly is set in the lower end of feed screw nut simultaneously, flange is arranged corresponding through hole, feed screw nut is fixed on shrouding by bolt, certainly, shrouding should arrange corresponding through hole in the screwed hole position of corresponding feed screw nut, can pass downwards from through hole strut.The medial surface of connecting bushing is sphere, there is in connecting bushing 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, thus make swivel becket be cydariform small in ends, broad in the middle, rotate Ring current distribution and be provided with axial regular hexagon hole, correspondingly, be regular hexagon to the cross section of the linkage section of strut epimere, this linkage section fits in the regular hexagon hole at swivel becket center.
In addition, for the ease of the installation of swivel becket, we to need on connecting bushing on the end face of feed screw nut along the circumferential direction decile to arrange the mounting groove 631 that two width are greater than swivel becket height, now two mounting grooves are located opposite from the radial direction of connecting bushing, 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 then with connecting bushing inside sphere through, mounting groove extends internally along the axis of connecting bushing, until the lateral surface of mounting groove and the medial surface of connecting bushing tangent.Like this, connecting bushing first can be fixed on the downside of auxiliary water flat-topped ridge by us, then makes swivel becket become vertical state, and is inserted in connecting bushing from relative two mounting grooves vertically.When the inner side sphere of bottom and connecting bushing that swivel becket is inserted into mounting groove is fitted, swivel becket is rotated 90 degree, make swivel becket and connecting bushing form mating spherical surfaces, thus swivel becket can be avoided to deviate from from connecting bushing.Now can be inserted into the upper end of strut in the regular hexagon hole at swivel becket center, and feed screw nut is fixed on the shrouding of auxiliary strut.Then rotate and make it increase to strut, the upper end of strut is then progressively entered in the polygonal hole of swivel becket, to transmit the end thrust to strut, thus between auxiliary strut and auxiliary water flat-topped ridge, produce the support force of a pretension, correspondingly, the support force of column then reduces to zero, and that is, now the support force of column is transferred on auxiliary strut.Because the fitting face of swivel becket and connecting bushing is sphere, therefore, even if the angle between auxiliary strut and auxiliary water flat-topped ridge produces deviation, that is, have an angle to the axis of strut and connecting bushing, the binding face of swivel becket and connecting bushing still can keep sphere-contact, and the axis transfer of support force is all the time through the centre of sphere coordinating sphere, therefore, auxiliary strut can not be subject to the impact of lateral force.Certainly, in rotation, to during strut, we also can adopt torque wrench, to set identical moment of torsion to strut, to guarantee that each pair of strut produces roughly the same thrust for all.In addition, we also need arranging an orthohexagonal convex shoulder 623 to the linkage section of strut and thread segment junction, rotate strut, form an axially mounting to swivel becket simultaneously to facilitate.In addition, we can arrange some oil storage tanks 641 extended 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 effectively reduces frictional resistance when swivel becket rotates;
D. the projected depth after foundation ditch to intensification is excavated, now, the column exposed between foundation ditch bottom surface and auxiliary water flat-topped ridge is the concrete column of column bottom, conveniently the building of base plate of foundation pit, as shown in Figure 5, we need remove the column between foundation ditch bottom surface and auxiliary water flat-topped ridge, are then again supported between auxiliary water flat-topped ridge and the column below foundation ditch bottom surface with the reinforcement post 10 of steel work;
E. as shown in Figure 6, complete building of base plate of foundation pit 9, because reinforcement post adopts steel work, and auxiliary strut more than foundation ditch bottom surface is now steel structure column, therefore makes reinforcing bar can be easily threaded through reinforcement post and auxiliary strut building base plate, particularly, the lower end of reinforcement post can be connected with bottom slab concreting, thus makes reinforcement post can bear very large support force, that is, reinforcement post now becomes a part for column, and column is effectively reinforced.Then remove the auxiliary strut between base plate and auxiliary water flat-topped ridge, can complete the reinforcing of column, the support force originally born by auxiliary strut is then delivered on the reinforcement post of column again.
Claims (3)
1. the column reinforcement means after foundation pit deepened, is characterized in that, comprise the steps:
A. on the side of every root post, corresponding horizontal shore place is by hole and the mode of pouring into arranges an auxiliary strut, and the degree of depth of auxiliary strut is greater than the degree of depth of column, and the upper end absolute altitude of auxiliary strut does not deepen the bottom surface absolute altitude of front original design higher than foundation ditch;
B. start to excavate foundation ditch, the castinplace pile around foundation ditch and the column in foundation ditch is made to expose soil layer, arrange and connect enclosing purlin beam and being connected to the horizontal shore enclosed between purlin beam of relative both sides of each castinplace pile, horizontal shore is connected with the upper end of each column simultaneously;
C. continue to excavate foundation ditch until arrive foundation ditch not deepen front original projected depth, the auxiliary strut in foundation ditch is made to expose soil layer, arrange in the below that foundation pit side-wall encloses purlin beam and connect the auxiliary of each castinplace pile and enclose purlin beam, the auxiliary auxiliary water flat-topped ridge enclosed between purlin beam being connected to relative both sides is set in the position of corresponding horizontal shore, auxiliary water flat-topped ridge and column become right-angled intersection to be connected, the upper end of auxiliary strut by being connected with on the downside of auxiliary water flat-topped ridge to support mechanism, thus makes auxiliary strut form the support force of a pretension to auxiliary water flat-topped ridge;
D. excavate the projected depth after foundation ditch to intensification, remove the column between foundation ditch bottom surface and auxiliary water flat-topped ridge, be again supported between auxiliary water flat-topped ridge and the column below foundation ditch bottom surface with the reinforcement post of steel work;
E. complete building of base plate of foundation pit, the lower end of reinforcement post is connected with base plate, then removes the auxiliary strut between base plate and auxiliary water flat-topped ridge, the reinforcing of column can be completed.
2. the column reinforcement means after a kind of foundation pit deepened according to claim 1, it is characterized in that, described auxiliary strut comprises the concrete column of hypomere and the steel structure column of epimere, concrete column is arranged in the soil layer below base plate of foundation pit, steel structure column is made up of shaped steel, it bracing piece comprising some vertical vertical rods and be connected between each vertical rod.
3. the column reinforcement means after a kind of foundation pit deepened according to claim 1, it is characterized in that, describedly support mechanism is comprised to the feed screw nut being fixed on auxiliary strut upper end, be threaded in vertically on feed screw nut to strut, and the connecting bushing be fixed on the downside of auxiliary water flat-topped ridge, 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, thus make swivel becket be small in ends, cydariform broad in the middle, rotate Ring current distribution and be provided with polygonal hole, fit in the polygonal hole of swivel becket to strut upper end, connecting bushing along the circumferential direction etc. is arranged with on the end face of feed screw nut the mounting groove that two width are greater than swivel becket height, described mounting groove extends along the axis of connecting bushing, the lateral surface of mounting groove is the face of cylinder, and it is tangent with the medial surface of connecting bushing.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105804089B (en) * | 2016-03-30 | 2018-01-12 | 广东华固工程有限公司 | Locally increase deep support system and its construction method after a kind of former deep foundation pit construction |
| CN112030982B (en) * | 2020-07-25 | 2021-12-03 | 湖北宏信基础工程有限公司 | Upright post reinforcing device after foundation pit deepening and using method |
| CN115262568B (en) * | 2022-05-16 | 2024-04-26 | 中国建筑第八工程局有限公司 | Deepening support and excavation construction method based on zero-field deep foundation pit |
| CN115015272A (en) * | 2022-06-13 | 2022-09-06 | 福建省岩田基建工程技术有限公司 | Steel bar supporting structure with detection function |
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| JP3659058B2 (en) * | 1999-04-19 | 2005-06-15 | 株式会社大林組 | Yamadome method with low strength underground wall |
| CN2835351Y (en) * | 2005-10-14 | 2006-11-08 | 浙江中成建工集团有限公司 | Horizontal supporting structure for reinforced concrete loop truss in deep foundation pit |
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| C06 | Publication | ||
| PB01 | Publication | ||
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