CN104099935A - Column reinforcement method after foundation pit deepening - Google Patents
Column reinforcement method after foundation pit deepening Download PDFInfo
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- CN104099935A CN104099935A CN201410128560.5A CN201410128560A CN104099935A CN 104099935 A CN104099935 A CN 104099935A CN 201410128560 A CN201410128560 A CN 201410128560A CN 104099935 A CN104099935 A CN 104099935A
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Abstract
The invention discloses a column reinforcement method after foundation pit deepening. The method comprises the following steps: arranging an auxiliary column beside each column, then digging a foundation pit, and arranging purlin beams and horizontal supporting beams; continuing to dig the foundation pit until the original design depth of the foundation pit is reached, arranging auxiliary purlin beams and auxiliary horizontal beams below the purlin beams on the side wall of the foundation pit, and connecting the upper ends of the auxiliary columns with the lower sides of the auxiliary horizontal beams through bracing mechanisms; digging the foundation pit to the deepened design depth, removing the columns between the bottom surface of the foundation pit and the auxiliary horizontal beams, and enabling reinforcement columns to be supported between the auxiliary horizontal beams and the columns positioned below the bottom surface of the foundation pit; completing the pouring of bottom plates of the foundation pit so that the lower ends of the reinforcement column and the bottom plates are connected into a whole, and then removing the auxiliary columns positioned between the bottom plates and the auxiliary horizontal beams. The column reinforcement method after foundation pit deepening provided by the invention has the advantages that the columns do not need to be re-poured, the supporting strength of the columns can be ensured, the support strength of the side wall of the deepened foundation pit is improved, the project quantity is favorably reduced, and the construction cost of a support system is reduced.
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 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.For example, disclosed in Chinese patent literature " a kind of detachable prestressing force bracing frame system ", notification number is CN103161168A, and it comprises around one group of engineering method stake of margin of foundation pit setting and be 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, can increase the structural stability of bracing frame system, are conducive to reduce costs.For some large-scale foundation ditches, people can arrange some in order to the column of support level brace summer below horizontal shore, and the part that column is positioned at below foundation ditch bottom surface need to have enough length, to make column still there is enough support forces after excavation of foundation pit, avoid occurring being bent downwardly phenomenon after horizontal support beam stress.
Because the number of plies of subterranean layer usually there will be some changes after going into operation; when the number of plies of local substrustion increases; we must correspondingly increase the degree of depth of foundation ditch; after foundation ditch digs deeply, the part that the column having poured into is positioned at below foundation ditch bottom surface will become shorter, thereby cannot meet the supporting requirement of the foundation ditch after intensification; like this; original column cannot be used, and need to again pour into the column that increases 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 solve the problem that the existing foundation pit deepened rear column of existing Large Foundation Pit supporting and protection structure need pour into thereby increase engineering quantity and construction cost again, column after a kind of foundation pit deepened reinforcement means is provided, on the one hand without again pouring into column, the support strength that can guarantee column, is conducive to reduce engineering quantity simultaneously.
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 of the adjacency place of every root post, by the mode of holing and pour into, an auxiliary strut is set, 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 is not deepened the bottom surface absolute altitude of front original design higher than foundation ditch;
B. start to excavate foundation ditch, make castinplace pile around of foundation ditch and the column in foundation ditch expose soil layer, the horizontal shore between purlin beam that encloses that encloses purlin beam and be connected to relative both sides that connects each castinplace pile is set, and horizontal shore is connected with the upper end of each column simultaneously;
C. continue to excavate foundation ditch and do not deepen front original projected depth until arrive foundation ditch, make the auxiliary strut in foundation ditch expose soil layer, foundation pit side-wall enclose purlin beam below the auxiliary purlin beam that encloses that connects each castinplace pile is set, position at corresponding horizontal shore arranges the auxiliary auxiliary water flat-topped ridge enclosing between purlin beam that is connected to relative both sides, auxiliary water flat-topped ridge becomes right-angled intersection to be connected with column, the upper end of auxiliary strut is by support mechanism is connected with auxiliary water flat-topped ridge downside, thereby makes auxiliary strut to auxiliary water flat-topped ridge, form the support force of a pretension;
D. excavate the projected depth after foundation ditch is extremely deepened, remove the column between foundation ditch bottom surface and auxiliary water flat-topped ridge, with the reinforcement post of steel work, be again supported between auxiliary water flat-topped ridge and the column below foundation ditch bottom surface;
E. complete building of base plate of foundation pit, the lower end of reinforcement post is connected with base plate, then remove the auxiliary strut between base plate and auxiliary water flat-topped ridge, can complete the reinforcing of column.
When needs increase one deck underground building and add deep foundation ditch, we can first pour into some auxiliary struts in soil layer, as a kind of supplemental support of column, play reinforcement effect.Because auxiliary strut is imbedded the degree of depth that the degree of depth in soil layer is greater than 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 being connected with the horizontal shore of the superiors, therefore its length is short more a lot of than again pouring into new column, that is to say, its engineering quantity and cost are much lower.Originally the suffered pressure of column is delivered on auxiliary strut by the transitional function of auxiliary water flat-topped ridge, thereby can meet the requirement of support.And the column of concrete structure substitutes with the reinforcement post of steel work between foundation ditch bottom surface and auxiliary water flat-topped ridge, 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 there is enough support forces.Particularly, auxiliary water flat-topped ridge of the present invention plays an effect of transmitting support force on the one hand, is conducive to improve the supporting intensity of the foundation pit side-wall after deepening simultaneously, has improved 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 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 auxiliary strut hypomere is conducive to guarantee the bearing capacity of auxiliary strut in earth, the passing through of reinforcing bar when the steel structure column of epimere is convenient to build the structures such as base plate, and facilitate the dismounting in later stage and reuse as reinforcement post.
As preferably, describedly support mechanism is comprised to the feed screw nut who is fixed on auxiliary strut upper end, be threaded in vertically on feed screw nut to strut, and the connecting bushing that is fixed on auxiliary water flat-topped ridge 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.
Therefore, the present invention has following beneficial effect: without again pouring into column, can guarantee the support strength of column simultaneously, and improve the supporting intensity of the foundation pit side-wall after deepening, be conducive to reduce engineering quantity, reduce 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.
The specific embodiment
Below in conjunction with accompanying drawing and the specific embodiment, the present invention will be further described.
As Fig. 1, shown in Fig. 2, column reinforcement means after a kind of foundation pit deepened, it is applicable to the castinplace pile of margin of foundation pit and the column of foundation ditch inside completes, and foundation ditch need to increase the situation of B1 while not yet excavating, that is to say, column wherein and the degree of depth of castinplace pile are according to original foundation depth design perfusion, and the height that the B1 that the degree of depth that foundation ditch need to increase is roughly equivalent to newly increase is built, as what it will be appreciated by those skilled in the art that, be, the degree of depth that column and castinplace pile are embedded in below the foundation ditch bottom surface before not deepening is greater than the height that B1 is built, that is to say, after 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 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. at the corresponding horizontal shore of adjacency 4 places of every root post 5, an auxiliary strut 8 is set, 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 is not deepened the bottom surface absolute altitude of front original design higher than foundation ditch.Auxiliary strut can adopt the mode of holing and pouring into complete, and for the ease of construction, the hypomere of auxiliary strut is concrete column 81, to produce enough support forces simultaneously.The epimere of auxiliary strut is steel structure column 82, and it can be made by shaped steel such as i iron, H shaped steel, and the cross section quadrate of steel structure column, specifically comprises four in the vertical vertical rod of edge and laterally or be obliquely connected to the bracing piece between each vertical rod.The point of interface absolute altitude of the concrete column of auxiliary strut and steel structure column is lower than the foundation ditch bottom surface absolute altitude after deepening;
B. start to excavate the top layer soil layer of foundation ditch, make castinplace pile 1 around of foundation ditch and the column in foundation ditch expose soil layer, the horizontal shore 4 between purlin beam that encloses that encloses purlin beam 2 and be connected to relative both sides that connects each castinplace pile is set, horizontal shore is connected with the upper end of each column simultaneously, and enclose purlin beam, horizontal shore wherein preferably adopt concrete structure.It should be noted that, column preferably should adopt and the similar segmental structure of auxiliary strut, its hypomere is similarly concrete column, epimere is steel structure column, and be understandable that, the point of interface absolute altitude of the concrete column of column and steel structure column should be lower than the absolute altitude that does not add 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 and do not deepen front original projected depth until arrive foundation ditch, make the auxiliary strut in foundation ditch expose soil layer, foundation pit side-wall enclose purlin beam below the auxiliary purlin beam 3 that encloses that connects each castinplace pile is set, in the position of corresponding horizontal shore, the auxiliary auxiliary water flat-topped ridge 7 enclosing between purlin beam that is connected to relative both sides is set simultaneously, auxiliary water flat-topped ridge becomes right-angled intersection to be connected with column, the upper end of auxiliary strut is by support mechanism 6 is connected with auxiliary water flat-topped ridge downside, thereby makes auxiliary strut to auxiliary water flat-topped ridge, form the support force of a pretension.With enclose purlin beam, horizontal shore is similar, auxiliary encloses purlin beam, auxiliary water flat-topped ridge preferably adopts concrete structure.Stressed evenly in order to make support mechanism, as shown in Figure 3, Figure 4, of the present invention to support mechanism 6 comprise be fixed on the feed screw nut 61 of auxiliary strut upper end, be vertically threaded on feed screw nut to strut 62 and the connecting bushing 63 that is fixed on auxiliary water flat-topped ridge 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 auxiliary strut, we can be fixedly installed on the steel structure column top of auxiliary strut a shrouding, 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.
In addition, 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 auxiliary water flat-topped ridge, 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 auxiliary strut.Then rotate strut is made to its rising, to the upper end of strut, progressively enter in the polygonal hole of swivel becket, to transmit the end thrust to strut, thereby between auxiliary strut and auxiliary water flat-topped ridge, produce the support force of a pretension, correspondingly, the support force of column reduces to zero, that is to say, 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 to say, the axis of strut and connecting bushing is had to an angle, and 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 that coordinates sphere, therefore, auxiliary strut can not be subject to the impact of lateral force.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.In addition, we also 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;
D. excavate the projected depth after foundation ditch is extremely deepened, now, the column exposing between foundation ditch bottom surface and auxiliary water flat-topped ridge is the concrete column of column bottom, in order to facilitate 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, then with the reinforcement post 10 of steel work, are again supported between auxiliary water flat-topped ridge and the column below foundation ditch bottom surface;
E. as shown in Figure 6, complete building of base plate of foundation pit 9, because reinforcement post adopts steel work, and more than foundation ditch bottom surface now auxiliary strut is steel structure column, therefore makes reinforcing bar can pass easily reinforcement post and auxiliary strut building base plate, particularly, the lower end of reinforcement post can be connected with bottom slab concreting, thereby makes reinforcement post can bear very large support force, that is to say, 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 being born by auxiliary strut is delivered on the reinforcement post of column again.
Claims (4)
1. the column reinforcement means after foundation pit deepened, is characterized in that, comprises the steps:
A. at the corresponding horizontal shore of the adjacency place of every root post, by the mode of holing and pour into, an auxiliary strut is set, 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 is not deepened the bottom surface absolute altitude of front original design higher than foundation ditch;
B. start to excavate foundation ditch, make castinplace pile around of foundation ditch and the column in foundation ditch expose soil layer, the horizontal shore between purlin beam that encloses that encloses purlin beam and be connected to relative both sides that connects each castinplace pile is set, and horizontal shore is connected with the upper end of each column simultaneously;
C. continue to excavate foundation ditch and do not deepen front original projected depth until arrive foundation ditch, make the auxiliary strut in foundation ditch expose soil layer, foundation pit side-wall enclose purlin beam below the auxiliary purlin beam that encloses that connects each castinplace pile is set, position at corresponding horizontal shore arranges the auxiliary auxiliary water flat-topped ridge enclosing between purlin beam that is connected to relative both sides, auxiliary water flat-topped ridge becomes right-angled intersection to be connected with column, the upper end of auxiliary strut is by support mechanism is connected with auxiliary water flat-topped ridge downside, thereby makes auxiliary strut to auxiliary water flat-topped ridge, form the support force of a pretension;
D. excavate the projected depth after foundation ditch is extremely deepened, remove the column between foundation ditch bottom surface and auxiliary water flat-topped ridge, with the reinforcement post of steel work, be again supported between auxiliary water flat-topped ridge and the column below foundation ditch bottom surface;
E. complete building of base plate of foundation pit, the lower end of reinforcement post is connected with base plate, then remove the auxiliary strut between base plate and auxiliary water flat-topped ridge, can complete the reinforcing of column.
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 by shaped steel, and it comprises some vertical vertical rods and is connected to the bracing piece 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 who is fixed on auxiliary strut upper end, be threaded in vertically on feed screw nut to strut, and the connecting bushing that is fixed on auxiliary water flat-topped ridge 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.
4. the column reinforcement means after a kind of foundation pit deepened according to claim 3, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410128560.5A CN104099935B (en) | 2014-04-01 | 2014-04-01 | Column reinforcement means after a kind of foundation pit deepened |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410128560.5A CN104099935B (en) | 2014-04-01 | 2014-04-01 | Column reinforcement means after a kind of foundation pit deepened |
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| CN104099935B CN104099935B (en) | 2015-10-21 |
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| CN105804089A (en) * | 2016-03-30 | 2016-07-27 | 广东华固工程有限公司 | Locally-deepened supporting and protecting system used after original deep foundation pit is constructed and construction method of system |
| CN112030982A (en) * | 2020-07-25 | 2020-12-04 | 张桂娟 | Upright post reinforcing device after foundation pit deepening and using method |
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| CN102995659A (en) * | 2012-12-03 | 2013-03-27 | 杭州南联地基基础工程有限公司 | Method for constructing from central area to periphery of ultra-large type underground engineering |
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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 |
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| CN112030982A (en) * | 2020-07-25 | 2020-12-04 | 张桂娟 | Upright post reinforcing device after foundation pit deepening and using method |
| 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 |
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|---|---|
| CN104099935B (en) | 2015-10-21 |
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