A steel plate bolt prestressed combined anchor support reaction frame and method

Abstract

The present invention discloses a steel plate bolt prestressed combined anchor support reaction frame and method, which relates to the field of construction, including at least two arched steel plates arranged at intervals, each of which is connected to a first ear plate at one end and a second ear plate at the other end; each first ear plate is vertically fixed to a first back plate, and each second ear plate is vertically fixed to a second back plate; the first back plate is used to be fixed to a building structure through anchor bolts, and a prestressed body for connecting to a building structure is fixed on the upper side of the second back plate. The bolted steel plate stiffening rib plate composed of the rib plate and the bolts of the present invention forms a hollow double-limb rib plate, which reduces the weight and volume of the rib plate cross section; the reaction frame is clearly subjected to force, and each component can be modularly assembled and used for turnover, which is simple and quick to install and disassemble, and has great versatility; the end plate of the reaction frame is fixed to the original structure by rear anchoring, and does not damage the original structure.

Description

Technical Field

[0001] The invention relates to the field of construction, and in particular to a steel plate bolt prestressed combined anchoring support reaction frame and a method. Background Art

[0002] At present, common renovations of existing buildings include: replacement and demolition of building load-bearing columns, translation of building units, and renovation of building floors. When reinforcing or renovating the load-bearing structure of a building, it is necessary to support the relevant stress-bearing areas of the structure. However, because existing buildings have been built and used for many years, the operating surface is limited and there is no point of application of loading equipment or the required load is large, the original structure bearing capacity is directly borne. Therefore, it is often necessary to add a special support reaction frame at the original structure application position.

[0003] In the field of building structure reinforcement and reconstruction, commonly used support reaction frames include cast-in-place concrete type, steel corbel lattice type, steel prestressed friction type, etc. Among them, the cast-in-place concrete type is to roughen the surface of the original structure, plant reinforcement and pour concrete to form a concrete corbel or sleeve. The reaction frame needs to wait until the concrete strength reaches the design strength before it can bear force, and it needs to be manually dismantled after the construction is completed, which is labor-intensive and environmentally unfriendly. The steel corbel lattice type is to weld steel structure steel components according to the on-site working conditions, and connect them to the original structure with prestressed tendons or post-embedded screws. When the reaction frame unloading is large, this method often requires a huge designed steel volume and weight, a large amount of on-site processing and welding, and is often not universal for different components, resulting in installation and material waste, affecting the construction period and construction efficiency. The prestressed friction type of steel is to use prefabricated steel, and fix the steel symmetrically on both sides of the structure through high-strength prestressed screws or prestressed tendons. The maximum static friction between the structure and the steel provided by the prestressing force provides an effective reaction force to support the load. The steel in this way is mostly large steel box girders, which are bulky and difficult to install, transport and transfer. Moreover, the support is often bulky in design considering strength and stability, and it is impossible to effectively optimize the cross section.

[0004] In summary, the existing conventional support reaction frames, especially when high lifting loads are required, are often large in size and weight, cannot be quickly installed on site, are not versatile, are difficult to install and transport on site, and cannot be modularized and streamlined, which increases material costs and greatly affects construction efficiency and construction period. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a steel plate bolt prestressed combined anchor support reaction frame and method, in which the bolted steel plate stiffening ribs composed of ribs and bolts form hollow double-limb ribs, thereby reducing the weight and volume of the rib cross-section; the reaction frame is clearly subjected to force, and each component can be modularly assembled and used in a cyclic manner, and the installation and disassembly is simple and quick, and has great versatility; the end plates of the reaction frame are fixed to the original structure by rear anchoring, without damaging the original structure.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In the first aspect, an embodiment of the present invention provides a steel plate bolt prestressed combined anchor support reaction frame, comprising at least two arched steel plates arranged at intervals, each arched steel plate being connected to a first ear plate at one end and a second ear plate at the other end; each first ear plate is vertically fixed to a first back plate, and each second ear plate is vertically fixed to a second back plate; the first back plate is used to be fixed to a building structure by anchor bolts, and a prestressed body for connecting to the building structure is fixed to the upper side of the second back plate.

[0008] As a further implementation method, the prestressed body includes prestressed steel strands or prestressed tendons, anchors and anchor ends, the prestressed steel strands or prestressed tendons pass through the anchors and anchor ends in sequence, and the anchor ends are fixed at the centroid position of the second back plate.

[0009] As a further implementation, the anchoring end is a wedge-shaped end.

[0010] As a further implementation, the arched steel plate includes an integrally formed horizontal section, an inclined section, and a vertical section, and an angle between the inclined section and the vertical section is greater than an angle between the inclined section and the vertical section.

[0011] As a further implementation, the inclined sections of the arched steel plate are connected by two rows of clamping bolts, one row of which is located at the centroidal axis of the oblique width of the arched steel plate, and the other row is located outside the centroidal axis.

[0012] As a further implementation, the horizontal section is connected to the first ear plate through at least two rows of first connecting bolts, and the first ear plate is located outside the horizontal section; a stiffening plate is fixed to the outside of the first ear plate.

[0013] As a further implementation, the vertical section is connected to the second ear plate via a second connecting bolt, and the second ear plate is located outside the vertical section.

[0014] As a further implementation, the first back plate is arranged on one side of the building structure, or symmetrically arranged on both sides of the building structure;

[0015] When the first back plates are symmetrically arranged on both sides of the building structure, the two first back plates are connected by anchor bolts, and the prestressed body penetrates the building structure to be connected with the two second back plates.

[0016] In a second aspect, an embodiment of the present invention further provides a method for installing a steel plate bolt prestressed combined anchor support reaction frame, comprising:

[0017] The first back plate is mounted on the track beam by anchor bolts, and the first ear plate is connected to the first back plate and the stiffening plate by welds;

[0018] Fix the horizontal section of the arched steel plate to the first ear plate through a first connecting bolt, and connect the inclined sections of each arched steel plate through a clamping bolt;

[0019] Connecting the second ear plate to the vertical section of the arched steel plate via a second connecting bolt;

[0020] The prestressed steel strand or prestressed tendon is inserted into the anchor end, the prestressed steel strand or prestressed tendon is grinded and roughened near the end of the building structure, and is anchored into the building structure by planting reinforcement; an anchor is installed on the outside of the anchor end and tensioning is performed.

[0021] As a further implementation method, when the support reaction frame is used as a reaction support for building translation, the support reaction frame is installed on one side of the track beam; when the support reaction frame is used as a beam for opening an opening in a local renovation of a building wall, the support reaction frame is symmetrically arranged.

[0022] The beneficial effects of the present invention are as follows:

[0023] (1) The bolted steel plate stiffening rib plate composed of the bow-shaped steel plate and bolts of the reaction frame of the present invention forms a hollow double-limb rib plate structure, which reduces the weight and volume of the rib plate cross-section; the components are small and light, which improves the efficiency of on-site manual handling and installation and assembly; the reaction frame has clear force, and each component can be modularly assembled and used in a cyclic manner, which is simple and quick to install and disassemble, and has great universality; the end plate of the reaction frame is fixed to the original structure by rear anchoring (or tension screws), without damaging the original structure.

[0024] (2) The present invention forms a composite steel plate by bolting arched steel plates arranged at intervals instead of using an integral solid steel plate, which can greatly reduce the weight while ensuring the stress conditions of the steel plates. A prestressed body that provides tension is designed, which generates a reverse bending moment at the centroid position of the end plate. The reverse bending moment offsets the effect of part of the adverse bending moment, which is more conducive to the bearing of the structural device from the perspective of stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 is a schematic diagram of a reaction frame structure according to one or more embodiments of the present invention;

[0027] Figure 2 yes Figure 1 1-1 cross-sectional view;

[0028] Figure 3 yes Figure 2 2-2 section view;

[0029] Figure 4 yes Figure 2 3-3 section view;

[0030] Figure 5 yes Figure 1 Section 4-4 of ;

[0031] Figure 6 yes Figure 5 Section 5-5 of ;

[0032] Figure 7 yes Figure 1 -6 cross-section diagram;

[0033] FIG8 (a) is a schematic diagram of a bow-shaped steel plate structure according to one or more embodiments of the present invention;

[0034] FIG8( b ) is a schematic diagram of the bending moment of the cross section of the arched steel plate according to one or more embodiments of the present invention;

[0035] Fig. 9 is a schematic diagram of a prestressed body structure according to one or more embodiments of the present invention;

[0036] Fig.10 is a schematic diagram of a reaction frame used as a reaction support for building translation according to one or more embodiments of the present invention;

[0037] Fig.11 It is a schematic diagram of adding beams to open holes in a local renovation of a building wall using a reaction frame according to one or more embodiments of the present invention.

[0038] Among them, 1. the first ear plate, 2. the first back plate, 3. the stiffening plate, 4. the first connecting bolt, 5. the anchor bolt, 6. the bow steel plate, 7. the clamping bolt, 8. the second ear plate, 9. the second back plate, 10. the second connecting bolt, 11. the prestressed steel strand, 12. the anchor, 13. the anchor end, 14. the building structure, 15. the wall with the opening to be renovated, 16. the supporting column, 17. the horizontal section, 18. the inclined section, 19. the vertical section, 20. the jack, 21. the translation steel beam, 22. the track beam. DETAILED DESCRIPTION

[0039] Embodiment 1:

[0040] This embodiment provides a steel plate bolt prestressed combined anchor support reaction frame, such as Figure 1 As shown, it includes a first back plate 2, a second back plate 9, a first ear plate 1, a second ear plate 8, an arched steel plate 6, a prestressed body, etc. Two or more arched steel plates 6 are provided, and the first ear plate 1 is installed at one end of the arched steel plate 6, and the second ear plate 8 is installed at the other end.

[0041] After optimization calculation, this embodiment uses two spaced-apart arched steel plates 6 connected by bolts to form a combined steel plate instead of an integral solid steel plate, which can greatly reduce the weight while ensuring the stress conditions of the steel plates.

[0042] As shown in Fig. 8 (a), the arched steel plate 6 is an integrally cut steel plate, that is, it is composed of an integrally formed horizontal section 17, an inclined section 18 and a vertical section 19, and the horizontal section 17, the inclined section 18 and the vertical section 19 are respectively provided with bolt holes; after structural optimization and finite element analysis, the inclined section 18 of the arched steel plate 6 is provided with two rows of bolt holes for installing two rows of clamping bolts 7, and the opening position is located at the oblique width centroid axis and the periphery of the inclined section 18, and the setting position is the compression zone of the steel plate. Figure 7 As shown, the inclined sections 18 of the two arched steel plates 6 are connected by clamping bolts 7, which pass through the arched steel plates 6 and are clamped by nuts, effectively preventing the compression areas of the two arched steel plates 6 from buckling and becoming unstable under compression, thereby greatly reducing the weight of the ribs and achieving the purpose of safety and reliability.

[0043] The inclined section 18 forms a certain angle with the horizontal section 17 and the vertical section 19, respectively, and the formed angles are acute angles, wherein the angle between the inclined section 18 and the vertical section 19 is greater than the angle between the inclined section 18 and the horizontal section 17. In this embodiment, the angle between the inclined section 18 and the horizontal section 17 is 120°, and the angle between the inclined section 18 and the vertical section 19 is 150°.

[0044] Since the arched steel plate 6 has an inclination, there is a bending moment in its cross section. The maximum bending moment occurs at the connection position between the first ear plate 1 and the outermost row of bolts, as shown in FIG8 (b); the bending moment M=N*S, where N is the vertical lifting force and s is the distance from the center line of the bottom plate (the second back plate 9) to the first row of bolts. The distance shown in the figure is approximately 450 mm.

[0045] When the vertical lifting force N is fixed, the larger s is, the larger M is. Theoretically, when S is 90 degrees, that is, when the arched steel plate 6 is vertical, the bending moment is the smallest. However, if it is 90 degrees, the distance between the force-adding device and the main construction body is too small, and the space cannot complete the work of instrument adjustment, formwork support, and removal. Similarly, at the current angle, the distance between the center top of the designed first back plate 2 and the ground is about 1m, and its purpose is to facilitate personnel to install the first back plate 2 when the oblique length of the arched steel plate 6 is certain.

[0046] Under the action of fixed lifting force (unloading force) N, M is an unfavorable effect, but the bending moment value borne by the unfavorable section is fixed. In order to further ensure safety and increase the lifting force N of this device, a prestressed body is designed. The prestressed body provides a tensile force N', which generates a reverse bending moment of M'=N'*S' at the centroid position of the end plate. This M' offsets part of the unfavorable effect of M, which is more conducive to the bearing of the structural device from the perspective of force.

[0047] The horizontal section 17 of this embodiment is provided with two rows of bolt holes, and the first connecting bolts 4 pass through the corresponding bolt holes to install the first ear plate 1; the vertical section 19 is provided with a row of bolt holes, and the second connecting bolts 10 pass through the corresponding bolt holes to install the second ear plate 8.

[0048] like Figure 2 As shown, the ends of the horizontal sections 17 of the two arched steel plates 6 are welded and fixed to the first back plate 2 , and the first ear plate 1 is welded and fixed to the first back plate 2 . The first back plate 2 is a rectangular plate. The first back plate 2 is connected to the building structure 14 via a plurality of anchor bolts 5 .

[0049] like Figure 2-Figure 4 As shown, the outer sides of the horizontal sections 17 of the two arched steel plates 6 are respectively fitted with a first ear plate 1, and the first ear plate 1 is fixed to the horizontal section 17 by a first connecting bolt 4; a plurality of stiffening plates 3 are arranged at intervals on the outer side of the first ear plate 1, and the stiffening plates 3 are connected between the first back plate 2 and the first ear plate 1, and the stiffening plates 3 are perpendicular to the first ear plate 1 and arranged horizontally, and the stiffening plates 3 are triangular plates, and the connection strength of the horizontal section 17 is increased by the stiffening plates 3.

[0050] In this embodiment, four stiffening plates 3 are installed on each first ear plate 1, eight in total.

[0051] like Figure 5 and Figure 6 As shown, the end of the vertical section 19 of the arched steel plate 6 is welded and fixed to the second back plate 9, which is also a rectangular plate; the outer side of the vertical section 19 is in contact with the second ear plate 8, and the second ear plate 8 is connected to the vertical section 19 by a second connecting bolt 10.

[0052] In this embodiment, the first connecting bolt 4 is a 10.9sM30 high-strength bolt; the second connecting bolt 10 is a 10.9sM24 high-strength bolt; the anchor bolt 5 is a chemical bolt, or a screw-embedded anchor; the clamping bolt 7 is a 10.9s grade M30 high-strength bolt, and each clamping bolt 7 is equipped with four nuts and a full-thread screw.

[0053] A prestressed body is fixed on the upper side of the second back plate 9, the prestressed body is connected to the building structure 14, and the extension direction of the prestressed body is parallel to the anchor bolt 5. Fig. 9 As shown, the prestressed body includes a prestressed steel strand 11, an anchor 12 and an anchor end 13. The prestressed steel strand 11 passes through the anchor end 13, and the anchor end 13 is fixed to the upper surface of the second back plate 9 and is located at the centroid position of the second back plate 9; the anchor 12 is arranged on one side of the anchor end 13, and the prestressed steel strand 11 is anchored into the building structure 14.

[0054] In this embodiment, the anchoring end 13 is a wedge-shaped end; the prestressed steel strand 11 is 1860 grade with a diameter of 21.6 mm and a 0.2% yield strength of not less than 513 kN; and the anchor 12 is a matching clip-type single-hole anchor.

[0055] It is understandable that in other embodiments, the prestressed steel strands 11 and anchors 12 may also be replaced with small-diameter prestressed tendons and their matching anchors according to on-site usage conditions.

[0056] All steel components in this embodiment are Q355B grade steel.

[0057] In this embodiment, the bolted steel plate stiffening rib plate composed of the bow steel plate 6 of the reaction frame and the high-strength bolts forms a hollow double-limb rib plate structure, which reduces the weight and volume of the rib plate cross-section; each component is small and light, which improves the efficiency of on-site manual handling and installation and assembly; the reaction frame is clearly subjected to force, and each component can be modularly assembled and used in a cyclic manner, which is simple and quick to install and disassemble, and has great universality; the end plate of the reaction frame is fixed to the original structure by rear anchoring (or tension screws) without damaging the original structure.

[0058] Embodiment 2:

[0059] In this embodiment, the reaction frame structure of the first embodiment is used as the reaction support for the translation of the building. Fig.10 As shown, firstly, the first back plate 2 is installed on the track beam 22 by means of anchor bolts 5. At this time, the first ear plate 1 is connected with the first back plate 2 and the stiffening plate 3 by means of welds.

[0060] Next, install the combined ribs, align the horizontal section 17 of the single-limb arched steel plate 6 with the bolt hole of the first ear plate 1, and use the first connecting bolt 4 to pass through the bolt holes of the arched steel plate 6 and the first ear plate 1, and fix them. Similarly, connect the other arched steel plate 6 and the first ear plate 1 tightly through the first connecting bolt 4, and at this time, the bolt holes on the two arched steel plates 6 are aligned.

[0061] Insert the screw of the clamping bolt 7 into the bolt hole from the outside of the arched steel plate 6, screw in two nuts between the two arched steel plates 6, turn the screw of the clamping bolt, and control the nut that has been selected and located between the two arched steel plates 6 to remain stationary, so that the screw of the clamping bolt 7 can be screwed into the bolt hole of the other arched steel plate 6. After the screw passes out of the bolt hole corresponding to the other arched steel plate 6, screw in the nut on the outside of the arched steel plate 6. At this time, tighten the four nuts of the clamping bolt 7 so that the two nuts on the outside of the clamping bolt 7 clamp the arched steel plate 6. Install the remaining clamping bolts 7 in the same way.

[0062] Align the bolt holes of the second ear plate 8 with the bolt holes of the arched steel plate 6, insert the second connecting bolts 10 and tighten them.

[0063] Prestressed installation: Drill holes in advance on the top surface of the track beam 22 corresponding to the prestressed steel strand 11 or the prestressed tendon, clean and inject the tendon-embedding glue, insert the prestressed steel strand 11 or the prestressed tendon into the anchoring end 13, grind and roughen the prestressed steel strand 11 or the prestressed tendon near the end of the track beam 22, and anchor it into the track beam by embedding the tendon. Install the anchor 12 outside the anchoring end 13 and tension it.

[0064] After the support reaction frame is installed, check that all bolts and components are installed tightly and correctly, then install the jack 20 and the translation steel beam 21, and transmit the thrust of the jack 20 to the track beam 22 through the lifting range of the jack 20 to realize the translation of the building.

[0065] Embodiment three:

[0066] In this embodiment, the reaction frame structure of the first embodiment is used as a part of a building wall for opening an opening and adding a beam, such as Fig.11 As shown, two reaction frames are symmetrically arranged relative to the wall 15 with the opening to be modified, and the first back plates 2 of the two reaction frames are respectively fitted with the wall 15 with the opening to be modified and connected by anchor bolts 5; the second back plates 9 are fixed to the support columns 16.

[0067] If the wall thickness is thinner, the anchor bolt 5 can be changed into a long screw rod to penetrate the anchored wall structure. After the upper structure is supported, a hole can be opened and a beam can be added to realize the transformation of the local hole opening in the wall.

[0068] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A steel plate bolt prestressed combined anchor support reaction frame, characterized in that: It comprises at least two arched steel plates arranged at intervals, one end of each arched steel plate is connected to a first ear plate, and the other end is connected to a second ear plate; each first ear plate is vertically fixed to a first back plate, and each second ear plate is vertically fixed to a second back plate; the first back plate is used to be fixed to a building structure by anchor bolts, and a prestressed body for connecting to the building structure is fixed on the upper side of the second back plate; The prestressed body comprises a prestressed steel strand or a prestressed tendon, an anchor and an anchor end, the prestressed steel strand or the prestressed tendon passes through the anchor and the anchor end in sequence, and the anchor end is fixed at the centroid position of the second back plate; The arched steel plate comprises an integrally formed horizontal section, an inclined section and a vertical section, and the angle between the inclined section and the vertical section is greater than the angle between the inclined section and the horizontal section.

2. A steel plate bolt prestressed combined anchor support reaction frame according to claim 1, characterized in that: The anchoring end is a wedge-shaped end.

3. The steel plate bolt prestressed combined anchor support reaction frame according to claim 1 is characterized in that: The inclined sections of the arched steel plate are connected by two rows of clamping bolts, one row of which is located at the centroidal axis of the oblique width of the arched steel plate, and the other row is located outside the centroidal axis.

4. The steel plate bolt prestressed combined anchor support reaction frame according to claim 3 is characterized in that: The horizontal section is connected to the first ear plate through at least two rows of first connecting bolts, and the first ear plate is located outside the horizontal section; a stiffening plate is fixed on the outside of the first ear plate.

5. The steel plate bolt prestressed combined anchor support reaction frame according to claim 4 is characterized in that: The vertical section is connected to the second ear plate through a second connecting bolt, and the second ear plate is located outside the vertical section.

6. The steel plate bolt prestressed combined anchor support reaction frame according to claim 5, characterized in that: The first back plate is arranged on one side of the building structure, or symmetrically arranged on both sides of the building structure; When the first back plates are symmetrically arranged on both sides of the building structure, the two first back plates are connected by anchor bolts, and the prestressed body penetrates the building structure to be connected with the two second back plates.

7. A method for installing a steel plate bolt prestressed combined anchor support reaction frame according to claim 6, characterized in that: include: The first back plate is mounted on the track beam by anchor bolts, and the first ear plate is connected to the first back plate and the stiffening plate by welds; Fix the horizontal section of the arched steel plate to the first ear plate through a first connecting bolt, and connect the inclined sections of each arched steel plate through a clamping bolt; Connecting the second ear plate to the vertical section of the arched steel plate via a second connecting bolt; The prestressed steel strand or prestressed tendon is inserted into the anchor end, the prestressed steel strand or prestressed tendon is grinded and roughened near the end of the building structure, and is anchored into the building structure by planting reinforcement; an anchor is installed on the outside of the anchor end and tensioning is performed.

8. The method for installing a steel plate bolt prestressed combined anchor support reaction frame according to claim 7 is characterized in that: When the support reaction frame is used as a reaction support for the translation of the building, the support reaction frame is installed on one side of the track beam; when the support reaction frame is used as a hole and beam for local transformation of the building wall, the support reaction frame is symmetrically arranged.

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