Prestressed underpinning reinforcement device and method for double-t plate structure

Abstract

The present application relates to the field of civil engineering, especially to the prestressed underpinning reinforcement device and method for double T plate structure, the existing building structure reinforcement technology belongs to passive reinforcement system, the concrete structure reinforcement method has poor reliability and durability, and the structure must be unloaded during construction, the prestressed underpinning reinforcement device for double T plate structure, including the reinforcement device body for double T plate, the double T plate includes rib beam, the reinforcement device body includes anchoring assembly, underpinning limiting assembly, tension balancing assembly and prestressed reinforcement, the anchoring assembly is matched with rib beam, the tension balancing assembly is located between underpinning limiting assembly, the prestressed reinforcement is arranged at rib beam, belongs to active reinforcement system, and realizes no unloading and no production during construction, and has good development prospect in the field of civil engineering, factory building and structural engineering.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of civil engineering, and in particular to a prestressed underpinning reinforcement device and method for a double T plate structure. BACKGROUND

[0002] The prefabricated prestressed concrete double T plate beam structure, hereinafter referred to as "double T plate", is a prestressed reinforced concrete load-bearing component combined with a plate and a beam, which is composed of a wide panel and two narrow and high rib beams. The compression zone section is large, the neutral axis is close to or enters the panel layer, the main tensile reinforcement has a large force arm, has good structural mechanics performance, clear force transmission level, and simple geometric shape. It is an economic performance excellent structural load-bearing component that can be made into large span and large coverage area.

[0003] Since the mid-1950s, "double T plate" has been developed all over the world and widely used in various industrial plants, commercial centers, parking garages and other large-span and heavy-load building structures. It has become one of the most commonly used building components for constructing single-story multi-span industrial plants and multi-story public and residential buildings.

[0004] The research and application of "double T plate" in China are relatively late. In the early stage of engineering application, the product selection and production mainly refer to the national building standard design drawing sets 06SG432-1 "Prestressed Concrete Double T Plate (Slope Plate Width 2.4m)", 09SG432-2 "Prestressed Concrete Double T Plate (Flat Plate Width 2.0m, 2.4m, 3.0m)", and 08SG432-3 "Prestressed Concrete Double T Plate (Slope Plate Width 3.0m)". Based on the in-depth research on "double T plate" and the improvement of the use requirements, the current engineering application mainly refers to the national building standard design drawing set 18G432-1 "Prestressed Concrete Double T Plate (Slope Plate Width 2.4m, 3.0m; Flat Plate Width 2.0m, 2.4m, 3.0m)".

[0005] According to the changes of the national building standard design drawing set, the "double T plate" and its building selected and produced using the old version of the standard cannot meet the requirements of the current national standard specification, and with the passage of time and the increase of use frequency, the prestress loss of the built-in prestressed reinforcement also gradually increases. Many structure safety and use function problems such as bending, shearing cracks, local concrete crushing and deflection exceeding limit have appeared in the existing "double T plate" due to insufficient bearing capacity, which need to be solved urgently.

[0006] In the existing building structure reinforcement technology, the common reinforcement methods of concrete structure mainly include the following aspects: the steel plate pasting reinforcement method, the outer package type steel reinforcement method, the fiber composite material pasting reinforcement method, the section increasing method, the concrete replacement reinforcement method and the like. Although these reinforcement methods can improve the strength of the double T plate to a certain extent, they all have the problems of insufficient connection reliability of new and old materials, poor durability, difficulty in solving the problem of excessive deflection and the like. According to the characteristics of the large-span double T plate, according to the theoretical relationship between the structural load and the calculated span bearing capacity, the calculated span of the double T plate is reduced by a suitable method or device, which is one of the best technical routes to solve the above-mentioned problems of the double T plate.

[0007] The Chinese invention patent CN109162480A, a double T plate middle tension external prestress reinforcement device and a reinforcement method, provides a double T plate middle tension external prestress reinforcement device and a reinforcement method to solve the problems of the double T plate in the prior art, such as the bending, shearing cracks and deflection exceeding the specification limit due to insufficient bearing capacity under load, but it is difficult to solve the diseases such as splitting of the rib beam at the end of the double T plate structure and crushing of the concrete, and it is difficult to meet the requirements of not stopping production during the reconstruction of most industrial plants.

[0008] The above-mentioned common reinforcement methods of concrete structure all belong to passive reinforcement system, and the structure must be unloaded during construction, especially for various industrial plant reinforcement and reconstruction projects, the construction of a single workshop requires the entire factory to stop production, which will cause huge economic losses. The corresponding external prestress technology as an active reinforcement system can realize non-unloading and non-stop production during construction, and for the double T plate structure, especially for the reinforcement and reconstruction of various industrial plant projects, it is one of the most comprehensive and economical reinforcement systems. SUMMARY

[0009] In view of the above situation, in order to overcome the defects of the prior art, the present application provides a prestressed underpinning reinforcement device and method for double T plate structure, which solves the problems of rib beam splitting and construction affecting plant production in the reinforcement of double T plate and the passive reinforcement method.

[0010] The technical scheme is that the prestressed underpinning reinforcement device for double T plate structure includes a reinforcement device body for double T plate, the double T plate includes a panel, a left rib beam and a right rib beam, the left rib beam and the right rib beam are symmetrically arranged below the panel, the end of the double T plate is supported on a main beam support, the reinforcement device body includes an anchoring assembly, an underpinning limiting assembly, a tension balancing assembly and a prestressed steel bar.

[0011] The anchoring assembly comprises a left first anchor, a left second anchor, a right first anchor and a right second anchor, the left first anchor and the right first anchor are arranged on the outer side of the left and right end of the rib beam respectively, and are fixed with the main beam support, the left second anchor and the right second anchor are arranged on the inner side of the intersection of the left and right end of the rib beam and the panel respectively;

[0012] The supporting and limiting assembly comprises a left supporting and limiting groove plate, a right supporting and limiting groove plate and a limiting device, the left and right supporting and limiting groove plates are arranged at the bottom of the left and right rib beams respectively, and the end is inserted into the inside of the main beam support, and the limiting device is arranged between the left and right supporting and limiting groove plates.

[0013] The tensioning and balancing assembly is arranged between the left and right supporting and limiting groove plates and parallel to the limiting device.

[0014] The prestressed steel bars comprise a left first prestressed steel bar and a left second prestressed steel bar arranged on the left and right sides of the left rib beam, and a right first prestressed steel bar and a right second prestressed steel bar arranged on the left and right sides of the right rib beam.

[0015] Further, the left first anchor comprises a left U-shaped seat and a left stand, the U-shaped seat comprises a left first baffle, a left second baffle and a left connecting plate with a fixing hole, the left first baffle and the left second baffle are arranged on both sides of the main beam support, the left stand is located at the center of the left connecting plate, the left stand is provided with a reinforcing plate around the connecting end of the left connecting plate, a left first anchor hole is arranged at the top of the left stand, and reinforcing ribs are arranged above and below the left first anchor hole, and the right first anchor is a component with the same structure and symmetrically arranged as the left first anchor.

[0016] Further, the left first baffle, the left second baffle, the left connecting plate and the reinforcing plate are steel plates.

[0017] Further, the left second anchor is located on the inner side of the intersection of the left rib beam end and the panel, a second anchor hole is arranged on the left second anchor, the second anchor hole is formed by using an electric hammer to punch, and is used in cooperation with a steel bar glue to form the left second anchor, and the right second anchor is a component with the same structure and symmetrically arranged as the left second anchor and located on the inner side of the intersection of the right rib beam and the panel.

[0018] Further, the prestressed steel bars including the left first prestressed steel bar, the left second prestressed steel bar, the right first prestressed steel bar and the right second prestressed steel bar all comprise a deformation section, an anchoring section and a tensioning section, and each anchoring section is connected with a corresponding anchor.

[0019] Further, the left two prestressed steel bars and the right two prestressed steel bars are symmetrically arranged prestressed steel bars, and are connected with the left two anchoring members and the right two anchoring members respectively, taking the left two prestressed steel bars as an example, the left two prestressed steel bars comprise a left two prestressed steel bar deformation section and left two prestressed steel bar anchoring sections at both ends, and a left two prestressed steel bar tension section, three locking nuts are arranged on the left two prestressed steel bar tension section in a manner of two on the outside and one on the inside, and the right two prestressed steel bar structure is consistent with the left two prestressed steel bar and the nut arrangement manner is consistent.

[0020] Further, the left one prestressed steel bar and the right one prestressed steel bar are symmetrically arranged prestressed steel bars, and are connected with the left one anchoring member and the right one anchoring member respectively, taking the left one prestressed steel bar as an example, the left one prestressed steel bar comprises a left one prestressed steel bar deformation section and left one prestressed steel bar anchoring sections at both ends, and a left one prestressed steel bar tension section, three locking nuts are arranged on the left one prestressed steel bar anchoring section and the left one prestressed steel bar tension section respectively in a manner of two on the outside and one on the inside, and the right one prestressed steel bar structure is consistent with the left one prestressed steel bar and the nut arrangement manner is consistent.

[0021] Further, the left supporting and replacing groove plate comprises a left groove plate, two sides of the left groove plate close to the main beam support end are respectively provided with a left one corner plate and a left two corner plate extending along the length direction, each of the corner plates is connected with the left groove plate at one half and is deeply supported on the main beam support at the other half, two sides of the left groove plate away from the main beam support end are respectively provided with a left one hanging plate and a left two hanging plate, top portions of the left one hanging plate and the left two hanging plate are respectively provided with a left one hanging plate hole and a left two hanging plate hole, the to-be-reinforced double T plate structure is provided with positioning holes corresponding to the hanging plate holes, the left groove plate is a C-shaped groove plate, the left one corner plate and the left two corner plate are L-shaped corner plates, the left one hanging plate and the left two hanging plate are thin steel plates, and the right supporting and replacing groove plate is the same as the left supporting and replacing groove plate in structure and is symmetrically arranged.

[0022] Further, the C-shaped left groove plate is arranged at the lower part of the left rib beam, the C-shaped opening faces upward, and the gap formed between the C-shaped left groove plate and the left rib beam is filled and compacted with non-shrinkage grouting material to form a sealing layer, and the groove plate in the right supporting and replacing groove plate is connected with the right rib beam in the same way.

[0023] Further, the limit stopper comprises limit angle plates and a plurality of limit stiffening plates, each of the limit stiffening plates is symmetrically arranged at both ends of the limit angle plate, and is divided into limit stiffening plate one, limit stiffening plate two, limit stiffening plate three and limit stiffening plate four, the limit stiffening plate one, the limit stiffening plate two, the limit stiffening plate three and the limit stiffening plate four are respectively corresponding to the left one angle plate, the left two angle plate, the right one angle plate and the right two angle plate, the left one limit hole close to the stiffening plate one, the left two limit hole between the two and the left three limit hole close to the limit stiffening plate two are sequentially arranged at the limit stiffening plate one and the limit stiffening plate two, the left one limit hole, the left two limit hole and the left three limit hole are equidistantly arranged, the right two limit hole between the two and the right three limit hole close to the limit stiffening plate four are sequentially arranged at the limit stiffening plate three and the limit stiffening plate four, and the right one limit hole, the right two limit hole and the right three limit hole are equidistantly arranged.

[0024] Further, the limit angle plate is a 90° L-shaped angle steel, and is arranged below the left and right support replacement groove plates, one side of the L-shaped limit angle plate is perpendicular to the left and right rib beams, and the other side is adjacent to the support main beam, and each of the limit stiffening plates is a steel plate.

[0025] Further, the balance angle plate is connected with the symmetrically arranged left and right tensioning members at both ends, the left tensioning member comprises a left tensioning angle plate, a left one tensioning stiffening plate and a left two tensioning stiffening plate, the left tensioning angle plate is arranged at the bottom of the C-shaped left groove plate away from the support end of the main beam, is perpendicular to the left rib beam and protrudes from both sides of the left rib beam, a left one tensioning hole and a left two tensioning hole are arranged on the left tensioning angle plate and correspond to the outer side of the edge of the C-shaped left groove plate, a left one tensioning stiffening plate and a left two tensioning stiffening plate are arranged between the left one tensioning hole and the left two tensioning hole, the right tensioning member is a symmetrically arranged part with the same structure as the left tensioning member, the right tensioning member comprises a right tensioning angle plate, a right one tensioning hole, a right two tensioning hole, a right one tensioning stiffening plate and a right two tensioning stiffening plate, the left tensioning angle plate, the balance connecting angle plate and the right tensioning angle plate are co-plate, and the contact surfaces of the left tensioning member and the C-shaped left groove plate and the right tensioning member and the C-shaped right groove plate are fixedly connected by welding according to the relative positions.

[0026] Further, the left tensioning angle plate, the right tensioning angle plate and the balance angle plate are L-shaped angle steels, each of the tensioning stiffening plates is a steel plate, and the to-be-reinforced double T plate structure is provided with positioning holes corresponding to the tensioning holes.

[0027] The reinforcing method of the prestressed support replacement reinforcing device for the double T plate structure is as follows:

[0028] S1: Preparing the required parts, anchor and underpinning slot plate and limit stop, placing one anchor on the outside of the left and right rib beam end of the left and right rib beam respectively, and fixing it with the end beam support of the reinforced "double T plate"; placing two anchors on the inside of the left and right rib beam end of the left and right rib beam respectively, at the position where the end rib beam of the "double T plate" intersects with the panel;

[0029] S2: Using an electric hammer to drill holes and clean holes according to the requirements of anchoring at the end of the left and right two anchors connected with the double T plate, and making left and right two anchor holes, the depth of which is adjusted according to the design requirements;

[0030] S3: Assembling left and right tensioning members and balance connecting plate, wherein the left and right tensioning members and balance connecting plate are fixed and connected by welding according to the relative position of the contact surface of the left and right tensioning members and the C-shaped left and right slot plate;

[0031] S4: Using a steel bar threading machine to thread the two ends of the left and right prestressed steel bars according to the design threading length to form threaded steel bars, and setting locking nuts at the anchoring section and tensioning section according to the connection with different parts; using a steel bar threading machine to thread the one end of the left and right two prestressed steel bars connected with the tensioning member according to the design threading length to form a threaded steel bar head, and setting a locking nut;

[0032] S5: Bending the left one prestressed steel bar according to the relative spatial position of the left one anchoring hole and the corresponding left one tensioning hole, and forming the left one prestressed steel bar deformation section and the left one prestressed steel bar anchoring section and the left one prestressed steel bar tensioning section at both ends through the threaded steel bar heads at both ends, and processing the right one prestressed steel bar in the same way; bending the left two prestressed steel bars according to the relative spatial position of the left two anchoring holes and the corresponding left two tensioning holes, forming the left two prestressed steel bar deformation section and the left two prestressed steel bar anchoring section and the left two prestressed steel bar tensioning section at both ends, and processing the right two prestressed steel bars in the same way as the left two prestressed steel bars;

[0033] S6: The left one prestressed steel bar anchoring section of the left one prestressed steel bar is horizontally inserted through the left one anchoring hole, and the locking nuts are used according to the principle of one locking nut inside the hole and two locking nuts outside the hole, which is permanently fixed inside and outside, forming the left one prestressed steel bar anchoring end; the left one prestressed steel bar tensioning section is horizontally inserted through the left one tensioning hole, and the locking nuts are used according to the principle of one locking nut inside the hole and two locking nuts outside the hole, which is temporarily fixed, and is ready for tensioning;

[0034] S7: Injecting the anchoring glue into the left two anchoring holes at 2 / 3 of the depth, and then implanting the left two anchoring segments of the left two prestressed steel bars into the left two anchoring holes, waiting for the anchoring glue to solidify and have enough tensile strength to form the anchoring ends of the left two prestressed steel bars, and then horizontally passing the tensioning segments of the left two prestressed steel bars through the corresponding left two tensioning holes, and temporarily fixing them according to the principle of one locking nut inside the hole and two locking nuts outside the hole, and then tensioning;

[0035] S8: Connecting and fixing the right one prestressed steel bar in the same way as the left one prestressed steel bar and the right two prestressed steel bars in the same way as the left two prestressed steel bars.

[0036] S9: Sealing and filling the gaps between the left channel plate and the left rib beam and the gaps between the right channel plate and the right rib beam with self-leveling non-shrinkage grouting material.

[0037] S10: Before the grouting material solidifies, using a torque wrench, the two locking nuts outside the tensioning hole are applied with a design torque of 30%, 70%, 90%, and 100% in sequence, with the left one tensioning hole and the right one tensioning hole being tensioned simultaneously, and the left two tensioning holes and the right two tensioning holes being tensioned simultaneously, and each stage holding time is not less than 2 minutes, and finally the three locking nuts inside and outside the tensioning hole are welded and fixed.

[0038] S11: Brushing anti-rust and fireproof oil paint on the above-mentioned anchoring components, underpinning limiting components, tensioning balancing components and prestressed steel bars for fireproof and corrosion-resistant treatment.

[0039] The left rib beam is provided with a left one anchoring piece and a left two anchoring piece on both sides near the main beam support, the right rib beam is provided with a right one anchoring piece and a right two anchoring piece on both sides near the main beam support, the left tensioning piece is arranged at the bottom of the left underpinning channel plate away from the main beam support, and the right tensioning piece is arranged at the bottom of the right underpinning channel plate away from the main beam support; the prestressed steel bar comprises a left one prestressed steel bar and a left two prestressed steel bar arranged on both sides of the left rib beam, and a right one prestressed steel bar and a right two prestressed steel bar arranged on both sides of the right rib beam; the anchoring segment of the left one prestressed steel bar is fixedly connected with the left one anchoring piece, and the tensioning segment is connected with the left tensioning piece; the anchoring segment of the left two prestressed steel bar is fixedly connected with the left two anchoring piece, and the tensioning segment is connected with the left tensioning piece; the anchoring segment of the right one prestressed steel bar is fixedly connected with the right one anchoring piece, and the tensioning segment is connected with the right tensioning piece; the anchoring segment of the right two prestressed steel bar is fixedly connected with the right two anchoring piece, and the tensioning segment is connected with the right tensioning piece.

[0040] The technical effect of the present application is that the building information model (BIM) technology is adopted to finely design the device, the torsion tool is adopted to start the left tensioning piece and the right tensioning piece to fasten the locking nut, prestress is applied, when the prestressed steel reaches the control tensioning force, the locking nut is locked, and the prestressed steel is permanently fixed between the anchoring piece and the tensioning piece; the external prestress underpinning device in the reinforcing device can reduce the calculation span of the double-T plate, improve the bending and shearing bearing capacity of the structure, solve the problems of crack and deflection exceeding limit of the structure, and realize the special requirements of not unloading and not stopping production during construction. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a schematic diagram of a double-T plate reinforcing device provided by the present application.

[0042] Figure 2 is a schematic diagram of a reinforced double-T plate provided by the present application.

[0043] Figure 3 is a schematic diagram of a left anchoring piece provided by the present application.

[0044] Figure 4 is a schematic diagram of a left second anchoring piece provided by the present application.

[0045] Figure 5 is a schematic diagram of a left underpinning groove plate provided by the present application.

[0046] Figure 6 is a schematic diagram of a position limiter provided by the present application.

[0047] Figure 7 is a schematic diagram of a tensioning piece and a balance connecting piece provided by the present application.

[0048] Figure 8 is a schematic diagram of a left prestressed steel provided by the present application.

[0049] Figure 9 is a schematic diagram of a left second prestressed steel provided by the present application.

[0050] In the figure: 1 - main beam support, 2 - panel, 3 - left rib beam, 4 - right rib beam, 5 - left one anchor, 6 - left two anchors, 7 - right one anchor, 8 - right two anchors, 9 - left replacement channel plate, 10 - right replacement channel plate, 11 - limit stop, 12 - left tensioning member, 13 - right tensioning member, 14 - balance connecting plate, 15 - left one prestressed steel, 16 - left two prestressed steels, 17 - right one prestressed steel, 18 - right two prestressed steels, 501 - left one baffle, 502 - left two baffles, 503 - left connecting flat plate, 504 - left fixed hole, 505 - left stiffening plate, 506 - left upright column, 507 - left stiffening rib, 508 - left one anchor hole, 601 - left two anchor holes, 901 - left channel plate, 902 - left one corner plate, 903 - left two corner plates, 904 - left one hanging plate, 905 - left two hanging plates, 906 - left one hanging plate hole, 907 - left two hanging plate holes, 1101 - limit corner plate, 1102 - limit stiffening plate one, 1103 - limit stiffening plate two, 1104 - limit hole one, 1105 - limit hole two, 1106 - limit hole three, 1107 - limit stiffening plate three, 1108 - limit stiffening plate four, 1109 - limit hole four, 1110 - limit hole five, 1111 - limit hole six, 1201 - left tensioning corner plate, 1202 - left one tensioning hole, 1203 - left two tensioning holes, 1204 - left one reinforcing plate, 1205 - left two reinforcing plates, 1301 - right tensioning corner plate, 1302 - right one tensioning hole, 1303 - right two tensioning holes, 1304 - right one reinforcing plate, 1305 - right two reinforcing plates, 1501 - left one prestressed steel deformation section, 1502 - left one prestressed steel anchoring section, 1503 - left one prestressed steel tensioning section, 1601 - left two prestressed steel deformation section, 1602 - left two prestressed steel anchoring section, 1603 - left two prestressed steel tensioning section. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0052] It should be noted that in the description of the present application, the terms indicating the direction or positional relationship of "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", "fourth" are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0053] In addition, it should be further pointed out that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] Embodiment one: by Figures 1 to 9 It is given that the prestressed underpinning reinforcement device for double T plate structure includes a reinforcement device body for double T plate, the double T plate includes a panel 2, a left rib beam 3 and a right rib beam 4, the left rib beam 3 and the right rib beam 4 are symmetrically arranged below the panel 2, the double T plate is supported at the end of the main beam support 1, the reinforcement device body includes an anchoring assembly, an underpinning limiting assembly, a tensioning balance assembly and a prestressed steel bar;

[0055] The anchoring assembly includes a left anchoring piece 5, a left second anchoring piece 6, a right first anchoring piece 7 and a right second anchoring piece 8, the left first anchoring piece 5 and the right first anchoring piece 7 are respectively arranged on the outer side of the end of the left rib beam 3 and the right rib beam 4, and are fixed with the main beam support 1, the left second anchoring piece 6 and the right second anchoring piece 8 are respectively arranged on the inner side of the intersection of the end of the left rib beam 3 and the right rib beam 4 with the panel;

[0056] The underpinning limiting assembly includes a left underpinning slot plate 9, a right underpinning slot plate 10 and a limiting piece 11, the left underpinning slot plate 9 and the right underpinning slot plate 10 are respectively arranged at the bottom of the left rib beam 3 and the right rib beam 4, and the end is inserted into the inside of the main beam support 1, the limiting piece 11 is arranged between the left underpinning slot plate 9 and the right underpinning slot plate 10;

[0057] The tensioning balance assembly is located between the underpinning slot plate 9 and the right underpinning slot plate 10, and is arranged in parallel with the limiting piece 11;

[0058] The prestressed steel bars include a left first prestressed steel bar 15 and a left second prestressed steel bar 16 arranged on the left and right sides of the left rib beam 3, and a right first prestressed steel bar 17 and a right second prestressed steel bar 18 arranged on the left and right sides of the right rib beam 4.

[0059] In the embodiment two, on the basis of the embodiment one, the left first anchoring part 5 includes a left U-shaped holder and a left vertical column 506, the U-shaped holder includes a left first baffle 501, a left second baffle 502 and a left connecting flat plate 503 with fixing holes 504, the left first baffle 501 and the left second baffle 502 are arranged on the left and right sides of the main beam support 1 respectively, the left vertical column 506 is located at the central part of the left connecting flat plate 503, the left vertical column 506 is provided with stiffening plates 505 around the connecting end of the left connecting flat plate 503, the top of the left vertical column 506 is provided with a left first anchoring hole 508, and stiffening ribs 507 are arranged above and below the left first anchoring hole 508 respectively, the right first anchoring part 7 is a component with the same structure as the left first anchoring part 5 and symmetrically arranged, and the left first baffle 501, the left second baffle 502, the left connecting flat plate 503 and the stiffening plates are steel plates;

[0060] The left second anchoring part 6 is located on the inner side of the intersection of the left rib beam 3 end and the panel 2, the left second anchoring part 6 is provided with a second anchoring hole 601, the second anchoring hole 601 is formed by using an electric hammer to punch a hole and is used in cooperation with anchoring glue to constitute the left second anchoring part 6, the right second anchoring part 8 is a component with the same structure as the left second anchoring part 6 and symmetrically arranged, located on the inner side of the intersection of the right rib beam and the panel 2, and the prestressed steel bars including the left first prestressed steel bar 15, the left second prestressed steel bar 16, the right first prestressed steel bar 17 and the right second prestressed steel bar 18 all include a deformation section, an anchoring section and a tensioning section, and each anchoring section is connected with a corresponding anchoring part;

[0061] The left second prestressed steel bar 16 and the right second prestressed steel bar 18 are symmetrically arranged prestressed steel bars and are connected with the left second anchoring part 6 and the right second anchoring part 8 respectively, taking the left second prestressed steel bar 16 as an example, the left second prestressed steel bar 16 includes a left second prestressed steel bar deformation section 1601 and left second prestressed steel bar anchoring sections 1602 at both ends and a left second prestressed steel bar tensioning section 1603, three locking nuts are arranged at the left second prestressed steel bar tensioning section 1603 in a manner of two on the outside and one on the inside, and the right second prestressed steel bar 18 has the same structure as the left second prestressed steel bar 16 and the same nut arrangement manner;

[0062] The left prestressed steel bar 15 and the right prestressed steel bar 17 are symmetrically arranged prestressed steel bars, and are connected with the left anchorage 5 and the right anchorage 7 respectively, taking the left prestressed steel bar 15 as an example, the left prestressed steel bar 15 comprises a left prestressed steel bar deformation section 1501 and two end left prestressed steel bar anchoring sections 1502, a left prestressed steel bar tensioning section 1503, the left prestressed steel bar anchoring section 1502 and the left prestressed steel bar tensioning section 1503 are provided with three locking nuts in the mode of two on the outside and one on the inside respectively, the right prestressed steel bar 17 is consistent with the left prestressed steel bar 15 in structure and consistent in nut setting mode;

[0063] The left supporting and replacing groove plate 9 comprises a left groove plate 901, two sides of the left groove plate 901 close to the main beam support end are respectively provided with a left first corner plate 902 and a left second corner plate 903 extending along the length direction, each of the corner plates is connected with the main beam support 1 beyond the end of the left groove plate 901, one half is connected with the left groove plate 901, and one half is deeply supported on the main beam support 1, two sides of the end of the left groove plate 901 away from the main beam support 1 are respectively provided with a left first hanging plate 904 and a left second hanging plate 905, the top of the left first hanging plate 904 and the left second hanging plate 905 is respectively provided with a left first hanging plate hole 906 and a left second hanging plate hole 907, the to-be-reinforced double T plate structure is provided with positioning holes corresponding to the hanging plate holes, the left groove plate 901 is a C-shaped groove plate, the left first corner plate 902 and the left second corner plate 903 are L-shaped corner plates, the left first hanging plate 904 and the left second hanging plate 905 are thin steel plates, the right supporting and replacing groove plate 10 is the same in structure as the left supporting and replacing groove plate 9 and is symmetrically arranged, the C-shaped left groove plate 901 is arranged at the lower part of the left rib beam 3, the C-shaped opening faces upward, and the gap between the C-shaped left groove plate 901 and the left rib beam 3 is filled and compacted with non-shrinkage grouting material to form a sealing layer, and the groove plate of the right supporting and replacing groove plate 10 is connected with the right rib beam in the same way;

[0064] The position limiter 11 comprises a position limiting angle plate 1101 and a plurality of position limiting stiffening plates, each of the position limiting stiffening plates is symmetrically arranged at both ends of the position limiting angle plate 1101, and is divided into a first position limiting stiffening plate 1102, a second position limiting stiffening plate 1103, a third position limiting stiffening plate 1107 and a fourth position limiting stiffening plate 1108, the first position limiting stiffening plate 1102, the second position limiting stiffening plate 1103, the third position limiting stiffening plate 1107 and the fourth position limiting stiffening plate 1108 are respectively corresponding to the left first angle plate 902, the left second angle plate 903, the right first angle plate 1002 and the right second angle plate 1003 in position, the first position limiting stiffening plate 1102 and the second position limiting stiffening plate 1103 are sequentially provided with the left first limiting hole 1104 close to the first position limiting stiffening plate 1102, the left second limiting hole 1105 between the two and the left third limiting hole 1106 close to the second position limiting stiffening plate 1103, the left first limiting hole 1104, the left second limiting hole 1105 and the left third limiting hole 1106 are equidistantly arranged, the third position limiting stiffening plate 1107 and the fourth position limiting stiffening plate 1108 are sequentially provided with the right second limiting hole 1110 between the two and the right third limiting hole 1111 close to the fourth position limiting stiffening plate 1108, the right first limiting hole 1109, the right second limiting hole 1110 and the right third limiting hole 1111 are equidistantly arranged, the position limiting angle plate 1101 is a 90° L-shaped angle steel and is arranged below the left and right support and replacement groove plates 9 and 10, one side of the L-shaped position limiting angle plate 1101 is perpendicular to the left and right rib beams 3 and 4, and the other side is adjacent to the support main beam 1, and each of the position limiting stiffening plates is a steel plate;

[0065] The balance gusset 14 is connected with the symmetrically arranged left tension member 12 and right tension member 13 at both ends, the left tension member 12 comprises a left tension gusset 1201, a left first tension stiffener 1204 and a left second tension stiffener 1205, the left tension gusset 1201 is arranged at the bottom of the left groove plate 901 away from the end of the main beam support 1, is perpendicular to the left rib beam 3, and protrudes from both sides of the left rib beam 03; the left first tension hole 1202 and the left second tension hole 1203 are arranged on the left tension gusset 1201, corresponding to the outside of the edge of the C-shaped left groove plate 901; the left first tension stiffener 1204 and the left second tension stiffener 1205 are arranged between the left first tension hole 1206 and the left second tension hole 1207, the right tension member 13 is a symmetrically arranged part with the same structure as the left tension member 12, the right tension member 13 comprises a right tension gusset 1301, a right first tension hole 1302, a right second tension hole 1303, a right first tension stiffener 1304 and a right second tension stiffener 1305, the left tension gusset 1201, the balance connecting gusset 14 and the right tension gusset 1301 are co-plate, the contact surfaces of the left tension member 1201 and the C-shaped left groove plate and the right tension member 1301 and the C-shaped right groove plate are fixedly connected by welding according to the relative positions, the left tension gusset 1201, the right tension gusset 1301 and the balance gusset 14 are L-shaped angle steels, each tension stiffener is a steel plate, and the to-be-reinforced double-T plate structure is provided with positioning holes corresponding to the tension holes.

[0066] Embodiment three: a reinforcing method of the prestressed underpinning reinforcing device for the double-T plate structure

[0067] S1: prefabricate the required parts, anchor and underpinning groove plate and position limiter, place the left first anchor 5 and the right first anchor 7 on the outside of the end of the left rib beam 3 and the right rib beam 4 respectively, and fix them with the end main beam support 1 of the reinforced “double-T plate”; the left second anchor 6 and the right second anchor 8 are arranged on the inside of the end of the left rib beam 3 and the right rib beam 4 respectively, at the position where the end rib beam of the “double-T plate” intersects with the panel;

[0068] S2: use an electric hammer to punch holes and clean holes according to the requirements of anchoring at one end of the left second anchor 6 and the right second anchor 8 connected with the double-T plate, and form left second anchor holes 601 and right second anchor holes, the depth of the left second anchor holes 601 and the right second anchor holes is adjusted according to the design requirements;

[0069] S3: assemble the left tension member 12, the right tension member 13 and the balance connecting plate 14, wherein the left tension member 12, the right tension member 13 and the balance connecting gusset 14 are co-plate, the contact surfaces of the left tension member 12 and the right tension member 13 and the C-shaped left groove plate and the right groove plate are fixedly connected by welding according to the relative positions;

[0070] S4: Both ends of the left and right prestressed steel bars 15 and 17 are sleeved with a reinforcing steel bar sleeve machine, and the sleeve length is designed according to the design sleeve length to form a sleeved reinforcing steel bar, which is divided into an anchoring section and a tensioning section according to the connection with different parts, and a locking nut is arranged on the anchoring section and the tensioning section; one end of the left and right prestressed steel bars 16 and 18 connected with the tensioning member is sleeved with a reinforcing steel bar sleeve machine, and the sleeve length is designed according to the design sleeve length to form a sleeved reinforcing steel bar head, and a locking nut is arranged;

[0071] S5: The left first prestressed steel bar 15 is bent according to the relative spatial position of the left first anchoring hole 508 and the corresponding left first tensioning hole 1202, and the left first prestressed steel bar deformed section 1501 and the left first prestressed steel bar anchoring section 1502 and the left first prestressed steel bar tensioning section 1503 at both ends are formed through the sleeved steel bar heads at both ends, and the right first prestressed steel bar 17 is processed in the same way; the left second prestressed steel bar 16 is bent according to the relative spatial position of the left second anchoring hole 601 and the corresponding left second tensioning hole 1203, and the left second prestressed steel bar deformed section 1601 and the left second prestressed steel bar anchoring section 1602 and the left second prestressed steel bar tensioning section 1603 at both ends are formed, and the right second prestressed steel bar 18 is processed in the same way as the left second prestressed steel bar 16;

[0072] S6: The left first prestressed steel bar anchoring section 1502 of the left first prestressed steel bar 15 is horizontally inserted through the left first anchoring hole 508, and a locking nut is arranged according to the principle of one locking nut inside the hole and two locking nuts outside the hole, and the inside and outside are permanently fixed to form the left first prestressed steel bar anchoring end; the left first prestressed steel bar tensioning section 1503 is horizontally inserted through the left first tensioning hole 1202, and a locking nut is arranged according to the principle of one locking nut inside the hole and two locking nuts outside the hole, and temporarily fixed, and then tensioned;

[0073] S7: The left second prestressed steel bar 16 is inserted into the left second anchoring hole 601, and the left second prestressed steel bar anchoring section 1602 is injected with anchoring glue to a depth of 2 / 3 of the left second anchoring hole 601, and then the left second prestressed steel bar anchoring end is formed after the anchoring glue is solidified and has sufficient tensile strength, and then the left second prestressed steel bar tensioning section 1603 is horizontally inserted through the corresponding left second tensioning hole 1203, and then a locking nut is arranged according to the principle of one locking nut inside the hole and two locking nuts outside the hole, and temporarily fixed, and then tensioned;

[0074] S8: The right first prestressed steel bar 17 is connected and fixed in the same way as the left first prestressed steel bar 15, and the right second prestressed steel bar 18 is connected and fixed in the same way as the left second prestressed steel bar 16;

[0075] S9: The gap between the left channel plate and the left rib beam, and the gap between the right channel plate and the right rib beam are sealed and filled with self-leveling non-shrinkage grouting material.

[0076] S10: Before the grouting material solidifies, using a torque wrench, according to the sequence of left one tension hole and right one tension hole at the same time, left two tension holes and right two tension holes at the same time, the two locking nuts outside the tension hole are applied with prestress in stages according to the design torque of 30%, 70%, 90%, 100%, and the holding time of each stage is not less than 2 minutes, and finally the three locking nuts inside and outside the tension hole are welded and fixed.

[0077] S11: The above-mentioned anchoring assembly, underpinning limiting assembly, tension balancing assembly and prestressed reinforcement are painted with anti-rust and fireproof paint for fireproof and corrosion-resistant treatment.

[0078] The left rib beam is provided with a left one anchoring piece and a left two anchoring piece on both sides near the main beam support, the right rib beam is provided with a right one anchoring piece and a right two anchoring piece on both sides near the main beam support, the left underpinning groove plate of the left rib beam is provided with a left tension piece at the bottom far from the main beam support, and the right underpinning groove plate of the right rib beam is provided with a right tension piece at the bottom far from the main beam support; the prestressed reinforcement comprises a left one prestressed reinforcement and a left two prestressed reinforcement arranged on both sides of the left rib beam, and a right one prestressed reinforcement and a right two prestressed reinforcement arranged on both sides of the right rib beam; the anchoring section of the left one prestressed reinforcement is fixedly connected with the left one anchoring piece, and the tension section is connected with the left tension piece; the anchoring section of the left two prestressed reinforcement is fixedly connected with the left two anchoring piece, and the tension section is connected with the left tension piece; the anchoring section of the right one prestressed reinforcement is fixedly connected with the right one anchoring piece, and the tension section is connected with the right tension piece; the anchoring section of the right two prestressed reinforcement is fixedly connected with the right two anchoring piece, and the tension section is connected with the right tension piece.

[0079] The technical effect of the present application is that the building information model (BIM) technology is used for fine design of the device, the torque tool is used to start the left tension piece and the right tension piece to tighten the locking nut, prestress is applied, when the prestressed reinforcement reaches the control tension, the locking nut is locked, and the prestressed reinforcement is permanently fixed between the anchoring piece and the tension piece; the external prestressed underpinning device in the reinforcing device can reduce the calculation span of the "double T plate", improve the bending and shearing bearing capacity of the structure, and solve the problems of crack and deflection exceeding the limit of the structure; at the same time, the special requirements of not unloading and not stopping production during construction can also be realized.

[0080] The application has been described in detail through specific embodiments and examples, but these do not constitute a limitation on the application. Those skilled in the art can make many modifications and improvements without departing from the principles of the application, and these should also be considered as within the scope of protection of the application.

Claims

1. A prestressed underpinning and reinforcing device for a double-T slab structure, comprising a reinforcing device body for the double-T slab, the double-T slab comprising a panel (2), a left rib beam (3), and a right rib beam (4), the left rib beam (3) and the right rib beam (4) being symmetrically arranged below the panel (2), the ends of the double-T slab being supported on a main beam support (1), characterized in that, The reinforcement device body includes an anchoring assembly, a support and limiting assembly, a tension balancing assembly, and prestressed steel bars; The anchoring assembly includes a left first anchor (5), a left second anchor (6), a right first anchor (7) and a right second anchor (8). The left first anchor (5) and the right first anchor (7) are respectively located on the outer side of the ends of the left rib beam (3) and the right rib beam (4) and are fixed to the main beam support (1). The left second anchor (6) and the right second anchor (8) are respectively located on the inner side of the intersection of the ends of the left rib beam (3) and the right rib beam (4) with the panel. The replacement limiting assembly includes a left replacement slot plate (9), a right replacement slot plate (10), and a limiter (11). The left replacement slot plate (9) and the right replacement slot plate (10) are respectively disposed at the bottom of the left rib beam (3) and the right rib beam (4), and their ends are inserted into the main beam support (1). The limiter (11) is disposed on the left replacement slot plate (9) and the right replacement slot plate (10). The tensioning balance assembly is located between the support slot plate (9) and the right support slot plate (10), and is set parallel to the limiter (11); The prestressed steel bars include a left first prestressed steel bar (15) and a left second prestressed steel bar (16) set on the left and right sides of the left rib beam (3), and a right first prestressed steel bar (17) and a right second prestressed steel bar (18) set on the left and right sides of the right rib beam (4).

2. The prestressed underpinning and reinforcing device for a double-T slab structure according to claim 1, characterized in that, The left anchor (5) includes a left U-shaped bracket and a left column (506). The U-shaped bracket includes a left first baffle (501), a left second baffle (502) and a left connecting plate (503) with fixing holes (504). The left first baffle (501) and the left second baffle (502) are respectively set on both sides of the main beam support (1). The left column (506) is located at the center of the left connecting plate (503). The left column (506) is surrounded by stiffening plates (505) at the connection end with the left connecting plate (503). The left column (506) is provided with a left first anchor hole (508) at the top, and stiffening ribs (507) are provided above and below the left first anchor hole (508). The right anchor (7) is a component with the same structure as the left anchor (5) and is symmetrically arranged.

3. The prestressed underpinning and reinforcement device for double-T slab structures according to claim 1, characterized in that, The left second anchor (6) is provided with left second anchor holes (601), and the right second anchor (8) is a component with the same structure and symmetrical arrangement as the left second anchor (6).

4. The prestressed underpinning and reinforcing device for a double-T slab structure according to claim 1, characterized in that, Each of the prestressed steel bars includes a deformation section, an anchorage section, and a tensioning section. Each anchorage section is connected to a corresponding anchor. The second prestressed steel bar on the left (16) and the second prestressed steel bar on the right (18) are symmetrically arranged prestressed steel bars and are respectively connected to the second anchor on the left (6) and the second anchor on the right (8). Locking nuts are provided at the tensioning ends of the second prestressed steel bar on the left (16) and the second prestressed steel bar on the right (18). The first prestressed steel bar on the left (15) and the first prestressed steel bar on the right (17) are symmetrically arranged prestressed steel bars and are respectively connected to the first anchor on the left (5) and the first anchor on the right (7). Locking nuts are provided at both ends of the first prestressed steel bar on the left (15) and the first prestressed steel bar on the right (17).

5. The prestressed underpinning and reinforcing device for a double-T slab structure according to claim 1, characterized in that, The left support plate (9) includes a left support plate (901). Corner plates are provided on both sides of one end of the left support plate (901). Each corner plate extends beyond the end of the left support plate (901) and is connected to the main beam support (1). Hanging plates are provided on both sides of the other end. Each hanging plate is provided with a hanging plate hole. The double T plate is provided with a positioning hole corresponding to the hanging plate hole. The right support plate (10) has the same structure as the left support plate (9) and is arranged symmetrically.

6. The prestressed underpinning and reinforcing device for a double-T slab structure according to claim 5, characterized in that, The left channel plate (901) is a C-shaped channel steel with the opening facing upwards, and each of the corner plates is an L-shaped angle steel. A sealing layer is provided between the left support channel plate (9) and the left rib beam (3).

7. The prestressed underpinning and reinforcing device for a double-T slab structure according to claim 1, characterized in that, The limiter (11) includes a limit angle plate (1101) and a plurality of limit stiffening plates. Each limit stiffening plate is symmetrically arranged at both ends of the limit angle plate (1101). Each limit stiffening plate corresponds to each of the angle plates shown. Limiting holes are provided on both sides of each limit stiffening plate.

8. The prestressed underpinning and reinforcing device for a double-T slab structure according to claim 1, characterized in that, The tension balancing assembly includes a balancing connecting plate (14) and tensioning members. Both ends of the balancing connecting plate (14) are connected to symmetrically arranged tensioning members. Each tensioning member includes a tensioning angle plate, a tensioning stiffening plate, and a tensioning hole. The tensioning hole is located at both ends of the tensioning member.

9. A reinforcement method for a prestressed underpinning reinforcement device for a double-T slab structure as described in any one of claims 1-8, characterized in that: S1: Prefabricate the required components, place the left first anchor (5) and the right first anchor (7) on the outside of the ends of the left rib beam (3) and the right rib beam (4) respectively, and fix them to the end main beam support (1) of the reinforced "double T plate"; place the left second anchor (6) and the right second anchor (8) on the inside of the ends of the left rib beam (3) and the right rib beam (4) respectively, at the position where the end rib beam of the "double T plate" intersects with the panel; S2: At the end where the left second anchor (6) and the right second anchor (8) are connected to the double T plate, use an electric hammer to drill holes and clean the holes according to the requirements of rebar installation to form the left second anchor hole (601) and the right second anchor hole. S3: Assemble the tensioning member and the balance connecting plate (14), wherein the tensioning angle plate and the balance connecting plate (14) are a common plate, and the contact surfaces of the two tensioning members with the left groove plate and the right groove plate are fixedly connected by welding according to their relative positions; S4: Use a rebar threading machine to thread both ends of the left prestressed steel bar (15) and the right prestressed steel bar (17) according to the designed threading length to form threaded steel bars. Divide them into anchorage section and tensioning section according to the connection with different components, and set lock nuts in the anchorage section and tensioning section respectively; Use a rebar threading machine to thread the end of the left second prestressed steel bar (16) and the right second prestressed steel bar (18) connected to the tensioning component according to the designed threading length to form threaded steel bar head, and set lock nuts; S5: The left prestressed steel bar (15) is bent according to the relative spatial position of the left anchor hole (508) and the corresponding tension hole, and the left prestressed steel bar deformation section (1501) and the left prestressed steel bar anchor section (1502) and the left prestressed steel bar tension section (1503) at both ends are formed through the threaded steel bar ends at both ends. The right prestressed steel bar (17) is processed in the same way. The left second prestressed steel bar (16) is bent according to the relative spatial position of the left second anchor hole (601) and the corresponding tension hole, forming the left second prestressed steel bar deformation section (1601) and the left second prestressed steel bar anchor section (1602) and the left second prestressed steel bar tension section (1603) at both ends. The right second prestressed steel bar (18) is processed in the same way as the left second prestressed steel bar (16). S6: Pass the left prestressed steel bar anchorage section (1502) horizontally through the left anchorage hole (508) and permanently fix it by locking it inside and outside with a lock nut to form the left prestressed steel bar anchorage end; Pass the left prestressed steel bar tensioning section (1503) horizontally through the left tensioning hole (1202) and temporarily fix it with a lock nut for tensioning. S7: Inject anchoring adhesive into the left second anchor hole (601) to a depth of 2 / 3. Then, insert the left second prestressed steel bar anchoring section (1602) of the left second prestressed steel bar (16) into the left second anchor hole (601). After the anchoring adhesive solidifies, the left second prestressed steel bar anchoring end is formed. Then, the left second prestressed steel bar tensioning section (1603) is horizontally passed through the corresponding tensioning hole. Then, a locking nut is used to temporarily fix it for tensioning. S8: Connect and fix the right first prestressed steel bar (17) in the same way as the left first prestressed steel bar (15), and the right second prestressed steel bar (18) in the same way as the left second prestressed steel bar (16); S9: The gap between the trough plate and the rib beam is sealed and filled with self-leveling non-shrink grout. S10: Before the grout solidifies, use a torque wrench to apply prestress in stages according to the order of simultaneously opening the left tension hole and the right tension hole, and simultaneously opening the left second tension hole and the right second tension hole. Apply the locking nuts outside the tension hole in stages at 30%, 70%, 90%, and 100% of the design torque. The holding time for each stage shall not be less than 2 minutes. Finally, weld and lock the locking nuts inside and outside the tension hole. S11: Apply anti-rust and fireproof paint to the above-mentioned anchoring components, underpinning and limiting components, tensioning and balancing components and prestressed steel bars for fireproofing and corrosion protection.

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