CN210685474U - Concrete underpins structure - Google Patents
Concrete underpins structure Download PDFInfo
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- CN210685474U CN210685474U CN201921362414.3U CN201921362414U CN210685474U CN 210685474 U CN210685474 U CN 210685474U CN 201921362414 U CN201921362414 U CN 201921362414U CN 210685474 U CN210685474 U CN 210685474U
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Abstract
The utility model belongs to the technical field of defective concrete reinforcement, in particular to a concrete underpinning structure, which comprises a plurality of combined supporting frames arranged between an upper floor slab and a lower floor slab and a transverse connecting piece connecting two adjacent combined supporting frames together; the combined support frame comprises a support upright post, a top cross beam, a bottom cross beam and a support beam bracket; the top cross beam penetrates through the replacement layer top plate shear wall and is positioned above the replacement layer concrete top plate, the bottom cross beam penetrates through the replacement layer bottom plate shear wall and is supported on the lower surface of the replacement layer concrete bottom plate, and the joist bracket is supported below the bottom cross beam; the supporting stand columns are symmetrically distributed on two sides of the shear wall to be replaced; the utility model discloses can carry out normal position concrete structure replacement under the prerequisite of not destroying and changing building structure outward appearance, solve the safety problem of defect concrete structure.
Description
Technical Field
The utility model belongs to the technical field of defect concrete reinforcement, especially, relate to a concrete underpins structure.
Background
Shear wall structures are widely used in high-rise buildings such as houses and businesses, and are the main structures of buildings for resisting horizontal loads and vertical loads due to the excellent bearing characteristics of the shear wall structures. Often cause the concrete structure bearing capacity of pouring the completion owing to pour quality defect, process management and control mistake scheduling problem not enough at the concrete placement in-process, can't satisfy the designing requirement. At present, the industry has more modes for reinforcing defective concrete, such as: steel plate bonding reinforcement, carbon fiber reinforcement, section increasing reinforcement and the like. However, in the case of commercial buildings, the change of the structural appearance of the buildings often affects the use functions of the buildings or causes poor social response, thereby causing difficulty in selling the buildings. Therefore, how to replace the concrete structure in situ without destroying and changing the appearance of the building structure is an urgent problem to be solved.
Disclosure of Invention
In view of this, the utility model aims at providing a concrete underpins structure can carry out normal position concrete structure replacement under the prerequisite of not destroying and changing building structure outward appearance, solves the safety problem of defect concrete structure.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a concrete underpinning structure comprises a plurality of combined supporting frames arranged between an upper floor slab and a lower floor slab and a transverse connecting piece for connecting two adjacent combined supporting frames together; the combined support frame comprises a support upright post, a top cross beam, a bottom cross beam and a support beam bracket; the top cross beam penetrates through the replacement layer top plate shear wall and is positioned above the replacement layer concrete top plate, the bottom cross beam penetrates through the replacement layer bottom plate shear wall and is supported on the lower surface of the replacement layer concrete bottom plate, and the joist bracket is supported below the bottom cross beam; the support stand columns are symmetrically distributed on two sides of the shear wall to be replaced, the upper ends of the support stand columns penetrate through the replacement layer concrete top plate and are fixedly supported on the lower surface of the top cross beam, the lower ends of the support stand columns abut against the upper surface of the replacement layer concrete bottom plate, and the lower ends of the support stand columns and the bottom cross beam are indirectly connected together through a connecting member penetrating through the replacement layer concrete bottom plate.
Furthermore, the lower end of the supporting stand column is fixedly connected to the foot margin connecting plate, the upper surface of the bottom cross beam is fixedly connected with a connecting steel plate, and the connecting member connects the supporting stand column and the bottom cross beam together through the foot margin connecting plate and the connecting steel plate.
Furthermore, in each combined support frame, the joist supports are symmetrically arranged on two sides of the bottom plate shear wall of the replacement layer, and the joist supports can be detachably and fixedly connected to the bottom plate shear wall of the replacement layer while supporting the bottom cross beam.
Furthermore, the transverse connecting piece comprises connecting beams and waist beams, wherein one connecting beam is connected between every two adjacent top cross beams, and one connecting beam is connected between every two adjacent bottom cross beams; meanwhile, a waist beam is connected between the waist parts of every two adjacent supporting upright columns.
Furthermore, the support frame also comprises a plurality of inclined supporting beams which are obliquely supported between two adjacent supporting upright columns.
Further, the joist support adopts a support bracket.
Compared with the prior art, the utility model discloses following advantage has:
the utility model is suitable for a defect concrete shear force wall structure carries out the original position and trades, for a safe effective bearing of non-picking chisel reservation structure. The bearing structure can effectively ensure that the stress and the deformation of the undetached reinforced concrete structure are within an allowable range, the influence on other structures after the structure is debugged is reduced to the maximum extent, the supporting area of the structure in a floor is reduced, the working surface is enlarged, and convenience is brought to the subsequent pouring construction of the replacement concrete.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a schematic structural view of the present invention;
fig. 2 is a sectional view at section a in fig. 1.
Description of reference numerals:
1-a support post; 21-a top cross beam; 22-bottom cross beam; 3-connecting the beam; 31-anchor bolts; 41-waist rail; 42-diagonal bracing beams; 421-connecting steel plate; 5-a joist bracket; 61-a ground pin connecting plate; 62-a steel backing plate; 7-connecting bolts; 81-replacement layer concrete roof; 82-replacement layer concrete bottom plate; 91-replacement of roof shear walls; 92-replacement floor shear walls; 93-a template; 94-shear wall to be replaced; 95-upper floor slab; 96-lower floor.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1-2, a concrete underpinning structure includes a plurality of composite support frames installed between an upper floor 95 and a lower floor 96, and a transverse connector connecting adjacent two composite support frames together; the transverse connecting piece connects all the combined supporting frames together to form a whole, namely the concrete underpinning structure.
The combined support frame comprises a support upright post 1, a top cross beam 21, a bottom cross beam 22 and a joist support 5; the top cross beam 21 vertically penetrates through the replacement layer top plate shear wall 91 and is positioned above the replacement layer concrete top plate 81, the bottom cross beam 22 vertically penetrates through the replacement layer bottom plate shear wall 92 and is supported on the lower surface of the replacement layer concrete bottom plate 82, and the joist support 5 is supported below the bottom cross beam 22; the top cross beam 21 and the bottom cross beam 22 are respectively provided with a plurality of beams, and the top cross beam 21 and the bottom cross beam 22 are vertically aligned in pairs, in the embodiment, the top cross beam 21 and the bottom cross beam 22 are made of I-shaped steel; the supporting columns 1 are symmetrically distributed on two sides of the shear wall 94 to be replaced, in this embodiment, the supporting columns 1 are made of i-steel, the upper ends of the supporting columns 1 penetrate through the replacement layer concrete top plate 81 and are supported and fixedly connected to the lower surface of the top cross beam 21, the upper ends of the supporting columns 1 and the top cross beam 21 are welded together, the lower ends of the supporting columns 1 abut against the upper surface of the replacement layer concrete bottom plate 82, and the lower ends of the supporting uprights 1 and the bottom cross member 22 are indirectly connected together by a connecting member passing through the replacement-layer concrete bottom plate 82, in this embodiment, the connecting member is a connecting bolt 7, specifically, the lower end of the support pillar 1 is welded to the anchor connecting plate 61, the upper surface of the bottom cross beam 22 is welded to a connecting steel plate 421, and the connecting member (connecting bolt 7) penetrates through the replacement layer concrete bottom plate 82 to connect the anchor connecting plate 61 and the connecting steel plate 421 together.
Further, in each combined support frame, the joist brackets 5 are symmetrically installed on two sides of the replacement floor shear wall 92, and the joist brackets 5 are detachably and fixedly connected to the replacement floor shear wall 92 while supporting the bottom cross beam 22. The joist supports 5 arranged on the two sides of the bottom plate shear wall 92 of the replacement floor ensure the stable connection of the bottom cross beam 22 on one hand and ensure the smooth transmission of the upper structural force to the next shear wall structure on the other hand.
In this embodiment, the joist support 5 is a support bracket. The support brackets are connected through the connecting bolts 7, and specifically, the support brackets on two sides are connected together to form a stable structure through a group of connecting bolts 7 penetrating through the bottom plate shear wall 92 of the replacement layer.
The transverse connecting piece comprises connecting beams 3 and waist beams 41, one connecting beam 3 is connected between every two adjacent top cross beams 21, one connecting beam 3 is connected between every two adjacent bottom cross beams 22, and the connecting beams 3 are fixed on corresponding shear walls by using anchor bolts 31; meanwhile, a waist beam 41 is connected between the waist parts of every two adjacent supporting upright posts 1. In this embodiment, the connecting beam 3 and the wale 41 are made of channel steel, and the connecting beam 3 is connected with the top cross beam 21 and the bottom cross beam 22, and the supporting upright 1 is connected with the wale 41 in a welding manner. The transverse connecting piece can increase the stability of the whole supporting structure, so that the whole underpinning structure is uniformly stressed.
Preferably, a plurality of inclined supporting beams 42 are further included, and the inclined supporting beams 42 are obliquely supported between two adjacent supporting upright posts 1. The angle steel is adopted by the inclined supporting beam 42, and is welded with the wing plate outside the supporting upright post 1 through a connecting steel plate 421, so that the structural stability is further enhanced.
The method for replacing the defective concrete by applying the concrete underpinning structure comprises the following steps:
and step A, taking the height of the top beam 21 at the position 300mm above the top plate 81 of the replacement layer as the beam bottom elevation of the top beam 21, forming a hole in the shear wall 91 of the top plate of the replacement layer so that the top beam 21 can pass through, forming a hole in the penetrating part of the top plate 81 of the replacement layer corresponding to the supporting upright 1, and forming a hole in the shear wall 92 of the bottom plate of the replacement layer so that the bottom beam 22 can pass through. Finding out the positions of the steel bars by using a steel bar scanner before opening the holes, marking the positions, and avoiding the stressed main steel bars of the structure when opening the holes; in order to ensure the verticality of the upright, the positions of the holes of the top cross beam 21 and the bottom cross beam 22 corresponding to the same supporting upright 1 are on the same vertical line.
Step B, enabling the top cross beam 21 to penetrate through a top plate shear wall 91 of the replacement layer, and enabling the bottom cross beam 22 to penetrate through a bottom plate shear wall 92 of the replacement layer; the exposed lengths of the top cross beam 21 on the two sides of the top plate shear wall 91 of the replacement layer are equal, and the exposed lengths of the bottom cross beam 22 on the two sides of the bottom plate shear wall 92 of the replacement layer are equal; the top cross beam 21 is filled with high-strength mortar in the gap between the upper flange of the top cross beam 21 and the edge of the opening during wall-through installation, and the bottom cross beam 22 is filled with high-strength mortar in the gap between the lower flange of the bottom cross beam 22 and the edge of the opening during wall-through installation, so that the force transmission among the supporting upright column 1, the top cross beam 21 and the bottom cross beam 22 is uniform, and the integrity of the underpinning structure is kept.
Step C, mounting a joist support 5 below the bottom cross beam 22, so that the joist support 5 is supported below the bottom cross beam 22; the joist brackets 5 are symmetrically arranged on two sides of the replacement floor shear wall 92, the joist brackets 5 can be detachably and fixedly connected on the replacement floor shear wall 92, and a group of connecting bolts 7 can penetrate through the replacement floor shear wall 92 to connect the joist brackets 5 on the two sides together. The joist supports 5 arranged on the two sides of the bottom plate shear wall 92 of the replacement layer ensure the stable connection of the bottom cross beam 22 on one hand, ensure the smooth transmission of the upper structure force to the next layer of shear wall structure on the other hand, and reduce the bending deformation of the bottom cross beam 22.
Step D, mounting the supporting upright post 1, enabling the upper end of the supporting upright post 1 to penetrate through the replacement layer concrete top plate 81, fixedly connecting the upper end of the supporting upright post 1 with the top cross beam 21, and indirectly connecting the lower end of the supporting upright post 1 with the bottom cross beam 22; the supporting upright post 1 is used as a vertical force transmission component of the whole support system, I-shaped steel is adopted, the blanking of the I-shaped steel is determined according to the actual length on site, the upper end of the supporting upright post 1 is welded with the top cross beam 21, the lower end of the supporting upright post 1 is welded on the foundation connecting plate 61, the upper surface of the bottom cross beam 22 is welded with a connecting steel plate 421, and the connecting bolt 7 penetrates through the replacement layer concrete bottom plate 82 to connect the foundation connecting plate 61 and the connecting steel plate 421 together.
Preferably, in the step D, the connection between the supporting upright post 1 and the top cross beam 21 and the bottom cross beam 22 is ensured to be tight and solid, and before the lower end of the supporting upright post 1 is installed, a steel wedge is firstly punched at the lower part of the supporting upright post 1 to apply prestress to the supporting upright post 1, so as to reduce the settlement deformation of the upper structure as much as possible and prevent the cracking of the upper structure wall; and enough distance (not less than 50mm) is reserved between the supporting upright post 1 and the shear wall 94 to be replaced when the supporting upright post 1 is installed, so that the lateral deformation of the template 93 can not generate lateral thrust on the supporting upright post 1 when concrete is poured at a later stage, and the instability of a supporting and replacing structure is caused.
E, installing a transverse connecting piece, and transversely connecting the supporting upright posts 1 together through the transverse connecting piece to form an integral underpinning structure; and finally, the whole underpinning structure is completely installed, and is uniformly stressed by applying prestress, so that the load of the concrete to be replaced is effectively removed, and the concrete replacement construction of the shear wall can be carried out.
In the process, the stability of the whole supporting structure can be improved by additionally arranging the transverse connecting piece, so that the whole underpinning structure is uniformly stressed, specifically, a channel steel is welded between every two adjacent top cross beams 21 and every two adjacent bottom cross beams 22, the channel steel is fixed on a corresponding shear wall by using the anchor bolt 31, and meanwhile, a channel steel is welded between the waist parts of every two adjacent supporting stand columns 1 to transversely connect the supporting stand columns 1; in addition, a plurality of angle steels are welded to serve as an oblique supporting structure so as to further enhance the stability of the structure, and two ends of each angle steel are welded with the outer side wing plates of the support upright posts 1 through connecting steel plates 421.
F, chiseling the concrete structure of the shear wall 94 to be replaced; in order to avoid damaging the original steel bars and excessively vibrating the intact concrete, the original low-strength concrete is chiseled manually by adopting a mode of combining an air pick, an electric hammer, a hand hammer and a chisel, and a tool with small vibration is used as far as possible.
Step G, erecting a template 93; before the formwork 93 is erected, sundries such as garbage, wood chips, wood shavings, sawdust, soil and loose concrete on the reinforcing steel bars are cleaned; according to the actual situation on site, on the premise of ensuring that the template 93 has enough strength, rigidity and stability, the purpose of economic safety is considered, a wood template is adopted, a steel pipe with the diameter of phi 48 and the wall thickness of 3.5mm and split bolts are adopted as a supporting system, and the carpenter is required to strictly operate according to the safe operation rules of the worker; the tight joint of the template 93 is ensured, the slurry does not leak, the supporting requirement of the template 93 is firm and reliable, and the template does not deform and expand; the supporting of the template 93 must be stable to ensure the geometric shape, the abutted seams of the template 93 must be tight, and the concrete is ensured not to leak slurry during the concrete pouring; there is sufficient distance between the form 93 and the supporting upright 1 to allow sufficient space for lateral deformation of the form 93 to prevent the form 93 from pressing against the supporting upright 1 in the expanded state.
Step H, pouring concrete with the same label as the replaced concrete in the template 93; when concrete is poured, according to the actual situation on site, two sections of pouring can be performed in the vertical direction if necessary, namely the first pouring is performed to the height of 1.8 m, the concrete liquid level of a pouring opening is higher than the pouring completion surface by 0.2 m, a vibrating rod is used for vibrating and compacting in time, the pouring opening is closed before the concrete is initially set, the concrete is continuously poured, the final pouring opening is higher than the elevation of the two-layer structure by about 0.3 m, the pressure compaction of the concrete is ensured, and grouting material is adopted for the closed concrete.
Step I, removing the template 93 and curing the concrete; strictly prohibiting disturbance treatment of the part within 24 hours after concrete pouring, and removing the mold about 12 hours after the concrete pouring; covering with straw bags after removing the mould, and spraying water or spraying with water pipe, continuously maintaining for 14 days, and keeping the concrete surface in a wet state all the time; the form 93 should be removed without hard prying or breaking so as to avoid damaging the concrete structure.
Step J, monitoring deformation of the shear wall and monitoring internal force of the underpinning structure; deformation monitoring needs to be carried out on a shear wall structure with more than 2 layers in the shear wall concrete replacement process, cracks of upper-layer structural member concrete caused by overlarge deformation are prevented, a specially-assigned person needs to be sent to monitor regularly in the monitoring process, observation points which are set in advance are observed regularly, elevation data are recorded in detail, and settlement and deformation of the original structure are guaranteed to be within an allowable range; and if the settlement deformation is aggravated or the total settlement amount exceeds 20mm, immediately stopping construction, reinforcing the underpinning structure, and continuing construction until the settlement rate tends to be moderate.
In the construction process, the underpinning structure is monitored for internal force, and the dismantling speed and sequence are adjusted in time according to the stress condition to prevent the original structure from being influenced by overlarge deformation. The monitoring instrument adopts a vibrating wire type surface strain meter, a strain meter reading instrument and an electric welding machine, the strain meter is installed in the middle position of the support stand column 1 for data acquisition and analysis, the early warning value is designed to be 700KN for vertical support axial force, construction should be stopped when the early warning value is reached, the first party and supervision are reported, the reason is analyzed, and construction is carried out after measures are taken.
K, dismantling the underpinning structure; and after the shear wall concrete replacement is finished, checking and accepting newly poured concrete, and when the strength of the maintenance test block under the same condition and the solid strength of non-damage monitoring reach the design values, dismantling the underpinning structure. The underpinning structure is dismantled by dismantling the underpinning support of the floor slab and then dismantling the underpinning support of the shear wall; and (4) when the strength of the to-be-replaced concrete under the same condition curing test block reaches 80% of the designed strength, performing subsequent main structure construction.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A concrete underpins structure which characterized in that: the combined support frame comprises a plurality of combined support frames arranged between an upper floor (95) and a lower floor (96) and a transverse connecting piece for connecting two adjacent combined support frames together;
the combined support frame comprises a support upright post (1), a top cross beam (21), a bottom cross beam (22) and a support beam bracket (5);
the top cross beam (21) penetrates through the replacement layer top plate shear wall (91) and is positioned above the replacement layer concrete top plate (81), the bottom cross beam (22) penetrates through the replacement layer bottom plate shear wall (92) and is supported on the lower surface of the replacement layer concrete bottom plate (82), and the joist bracket (5) is supported below the bottom cross beam (22); the supporting columns (1) are symmetrically distributed on two sides of the shear wall (94) to be replaced, the upper ends of the supporting columns (1) penetrate through the top plate (81) of the replacement layer concrete and are supported and fixedly connected to the lower surface of the top beam (21), the lower ends of the supporting columns (1) are abutted against the upper surface of the bottom plate (82) of the replacement layer concrete, and the lower ends of the supporting columns (1) and the bottom beam (22) are indirectly connected together through connecting members penetrating through the bottom plate (82) of the replacement layer concrete.
2. The concrete underpinning structure of claim 1, wherein: the lower end of the supporting upright post (1) is fixedly connected to the foot connecting plate (61), the upper surface of the bottom cross beam (22) is fixedly connected with a connecting steel plate (421), and the supporting upright post (1) and the bottom cross beam (22) are connected together through the foot connecting plate (61) and the connecting steel plate (421) by a connecting component.
3. The concrete underpinning structure of claim 1, wherein: in each combined support frame, joist brackets (5) are symmetrically arranged on two sides of a bottom plate shear wall (92) of a replacement layer, and the joist brackets (5) can be detachably and fixedly connected on the bottom plate shear wall (92) of the replacement layer while supporting a bottom cross beam (22).
4. The concrete underpinning structure of claim 1, wherein: the transverse connecting piece comprises connecting beams (3) and waist beams (41), one connecting beam (3) is connected between every two adjacent top cross beams (21), and one connecting beam (3) is connected between every two adjacent bottom cross beams (22); meanwhile, a waist beam (41) is connected between the waist parts of every two adjacent supporting upright posts (1).
5. The concrete underpinning structure of claim 4, wherein: the support frame further comprises a plurality of inclined supporting beams (42), and the inclined supporting beams (42) are obliquely supported between two adjacent supporting upright columns (1).
6. The concrete underpinning structure of claim 3, wherein: the joist bracket (5) adopts a supporting bracket.
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| CN201921362414.3U CN210685474U (en) | 2019-08-21 | 2019-08-21 | Concrete underpins structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397305A (en) * | 2019-08-21 | 2019-11-01 | 中建六局建设发展有限公司 | A kind of concrete underpinning structure and the method using its progress decaying concrete displacement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397305A (en) * | 2019-08-21 | 2019-11-01 | 中建六局建设发展有限公司 | A kind of concrete underpinning structure and the method using its progress decaying concrete displacement |
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