Combined structure and prestressed anti-floating anchor rod structure

Abstract

The utility model discloses a combined structure and a prestress anti-floating anchor rod structure, the combined structure can be applied to a tension anchoring end of a prestress anti-floating anchor rod, and the combined structure comprises a pressure bearing plate, a tension bearing plate and a pull rod rib; the bearing plate is used for being arranged on a cushion layer or a bottom plate of a building structure foundation, the bearing plate can be connected with a bus base material of the prestress anti-floating anchor rod, and the upper end of the bus base material penetrates through the bearing plate from bottom to top and is fixedly connected with the bearing plate through the working anchorage device. The tensile plate is pressed on a bottom plate reinforcing steel bar at the top of the bottom plate; the pull rod rib is arranged between the pressure-bearing plate and the pull-bearing plate, the lower end of the pull rod rib is fixedly connected with the pressure-bearing plate, and the upper end of the pull rod rib is fixedly connected with the pull-bearing plate. According to the combined structure, the tensioning and anchoring end, the cushion layer of the building foundation and the bottom plate can form an integral structure, so that stress is more uniform and reasonable.

Description

Technical Field

[0001] The utility model relates to the field of building foundation construction, in particular to a combined structure and a prestressed anti-floating anchor rod structure. Background Art

[0002] In areas with abundant water systems, most basements of buildings have anti-floating problems. The current solution is to use HRB400 grade threaded steel bars, etc., but their tensile strength design value is low. According to the provisions of the "Technical Standard for Anti-Floating of Construction Engineering" JGJ476-2019: For projects with anti-floating design grade A, they are designed to have no cracks, and tensile stress should not be generated in the anchor slurry under the standard combination of load effects; for projects with anti-floating design grade B, they are designed to be crack-controlled, and the tensile stress in the anchor slurry should not be greater than the axial tensile strength of the anchor slurry under the standard combination of load effects. However, the existing design method uses HRB400 grade threaded steel bars, which is difficult to solve the above problems.

[0003] The usual practice is to set a steel strand concrete beam or steel beam at the tensioning end of the prestressed steel strand anti-floating anchor, and then tension the prestressed steel strand on the outside of the beam. However, for the anti-floating anchor in the basement, there is no condition to set a steel strand concrete beam or steel beam; at the same time, since the anchoring section of the prestressed steel strand is set in the basement floor area, the tensioning of the prestressed steel strand cannot be set at the top of the anchor rod body of the anti-floating anchor, otherwise the prestressed steel strand in the floor will not be prestressed and cannot meet the use requirements.

[0004] Generally speaking, the tensioning end of the prestressed steel strand is not considered to be tensioned directly at the top of the anchor rod body, and the ordinary anchor rod cannot withstand this tensioning force. In addition, the prestressed steel strand of the anchor rod needs to be anchored in the base plate, and this part in the base plate also needs to be tensioned. If tension is applied at the top of the anchor rod body, the steel strand in the base plate will not be tensioned. Moreover, even if tension is applied, there will be no attachment for this tension because the base plate has not been constructed.

[0005] The conventional practice is to tension the prestressed steel strands after the basement floor is constructed. When the prestressed steel strands are tensioned, they will stretch, so there will be a gap between them and the basement. After the tensioning is completed, the gap will be grouted, which not only adds a grouting process, but also makes it difficult to fill the grouting densely, posing a great risk of water leakage. At the same time, since the tensioning end is higher than the basement floor, it will be exposed on the basement floor, which not only affects the appearance, but also causes great inconvenience to the use of the basement.

[0006] There are also some practices that add anchoring devices to the tension anchoring end, which can achieve uniform prestressing of the entire length of the prestressed steel strand, thereby improving the overall stability of the basement floor structure; and because the anchoring device of the anti-floating anchor rod is arranged in the basement floor area used to construct the basement floor, the basement floor can be poured in one go, and the anchoring end of the anti-floating anchor rod is completely buried in the basement floor and consolidated with it, so that the basement floor can be poured in one go, with high construction efficiency. Figure 1 and Figure 2 The existing anchor structure mainly includes: a guide cone cap 1, a guide bracket Steel bars 2, sealing pipe 3, anti-corrosion medium 4, extrusion sleeve 5, extrusion spring 6, central grouting pipe 7, bearing plate 8, lower joint of sealing pipe 9, C35 fine stone concrete 10, isolation bracket 11, anchor ring pressure bearing 12, working anchor ring / working clip 13 and under-anchor steel mesh 14, etc.

[0007] However, Figure 1 , Figure 2 There are also some serious problems in the embodiments. For example, but not limited to, although the anchoring device of this scheme is arranged within the structure of the bottom plate 200, it is mainly arranged in the middle and lower part of the bottom plate 200, and is not integrated with the steel bars at the top of the bottom plate 200. For example, the stress area of ​​the circled area I is small, and the upper bottom plate layer is not stressed. When the water pressure buoyancy value is greater than the concrete strength of the stress area of ​​the pressure bearing seat, the concrete in this area cracks and causes the anchoring stress to fail. In this way, when the groundwater buoyancy is large, since the anchoring structure is not completely integrated with the entire bottom plate 200, the anti-floating effect is not strong. When the buoyancy is large, the bottom plate structure will still be at risk of cracking under the huge buoyancy.

[0008] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0009] The utility model aims to provide a combined structure, which can make the tension anchor end and the cushion layer and bottom plate of the building foundation into an integral structure, so that the force is more uniform and reasonable.

[0010] Another purpose of the utility model is to provide a prestressed anti-floating anchor rod structure including the combined structure.

[0011] To achieve the above-mentioned purpose, the utility model provides a combined structure, which can be applied to the tension anchoring end of the prestressed anti-floating anchor rod, and the combined structure includes a pressure plate, a tension plate and a tie rod; the pressure plate is used to be arranged at the cushion layer or bottom plate of the building structure foundation, and the pressure plate can be connected to the busbar substrate of the prestressed anti-floating anchor rod, and the upper end of the busbar substrate passes through the pressure plate from bottom to top and is fixedly connected to the pressure plate through a working anchor; the tension plate is used to be pressed on the bottom plate steel bars on the top of the bottom plate; the tie rod is used to be arranged between the pressure plate and the tension plate, the lower end of the tie rod is fixedly connected to the pressure plate, and the upper end of the tie rod is fixedly connected to the tension plate.

[0012] In a preferred embodiment, the pressure plate is arranged in the cushion layer, at the junction between the cushion layer and the base plate, or in the base plate.

[0013] In a preferred embodiment, the busbar substrate includes unbonded steel strands, slow-bonded steel strands or precision-rolled rebar.

[0014] In a preferred embodiment, the working anchor comprises a working anchor and a working clip.

[0015] In order to achieve the other purpose mentioned above, the utility model also provides a prestressed anti-floating anchor structure, which includes the combined structure as mentioned above, and the prestressed anti-floating anchor structure also includes a busbar substrate, a plurality of isolation brackets, an upper sealing device and a load-bearing fixed end; the upper end of the busbar substrate is fixedly connected to the tensioning anchor end; a plurality of isolation brackets are arranged at a plurality of middle positions of the busbar substrate; the upper sealing device is arranged at the connection between the busbar substrate and the pressure plate; the load-bearing fixed end is arranged at the lower end of the prestressed anti-floating anchor structure.

[0016] In a preferred embodiment, the bearing fixed end includes a bearing plate, an extrusion sleeve / spring, a fixed end sealing cover and a central grouting pipe; the lower end of the busbar substrate is fixedly connected to the bearing plate; the extrusion sleeve / spring is extruded and fixed to the portion of the unbonded / slow-bonded steel strand passing through the bearing plate from top to bottom; the fixed end sealing cover is sealingly installed on the lower surface of the bearing plate, and the cover is arranged on the portion of the unbonded / slow-bonded steel strand passing through the bearing plate from top to bottom and the periphery of the extrusion sleeve / spring; the central grouting pipe passes through the bearing plate and the fixed end sealing cover at the same time, and the bearing plate and the fixed end sealing cover are fixedly connected together by a locking nut.

[0017] In a preferred embodiment, the bearing fixed end also includes multiple conical rubber sealing rings, sealing pads and sealing rings; multiple conical rubber sealing rings are arranged at the connection between the unbonded / slow-bonded steel strands and the central grouting pipe and the bearing plate; the sealing pad is arranged at the connection between the central grouting pipe and the fixed end sealing cover and the locking nut; the sealing ring is arranged at the connection between the fixed end sealing cover and the bearing.

[0018] In a preferred embodiment, the load-bearing fixed end also includes a guide bracket, a guide bracket constraint ring, an anti-corrosion medium and a spiral rib; the upper end of the guide bracket is fixedly connected to the load-bearing plate through a compression tube / extrusion spring and a hexagonal nut; the guide bracket constraint ring is arranged at the lower end of the guide bracket; the anti-corrosion medium is filled inside the fixed end sealing cover; the spiral rib is sleeved on the outside of multiple non-bonded / slow-bonded steel strands and is located above the load-bearing plate.

[0019] Compared with the prior art, the combined structure and prestressed anti-floating anchor structure of the utility model have the following beneficial effects: the combined structure of the present scheme includes a pressure plate arranged at the cushion layer and the bottom plate, a tension plate connected to the bottom plate steel bars, and a tension rod fixedly connected between the tension plate and the pressure plate. The tensioning anchor end of the prestressed anti-floating anchor structure including the combined structure is combined with the cushion layer and the bottom plate into an integrated structure, so that the force on the tensioning anchor end is more balanced and reasonable, which can greatly enhance the ability of the prestressed anti-floating anchor structure to resist the buoyancy of groundwater. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a prestressed anti-floating anchor structure according to an implementation method of the prior art;

[0021] Figure 2 It is a schematic diagram of the installation structure of the anchor ring pressure bearing according to an embodiment of the prior art;

[0022] Figure 3 It is a schematic diagram of the overall structure of a prestressed anti-floating anchor structure according to an embodiment of the utility model;

[0023] Figure 4 This is a schematic diagram of the installation structure of the combined structure according to one embodiment of the utility model;

[0024] Figure 5 It is a right side structural schematic diagram of a combined structure according to an embodiment of the utility model;

[0025] Figure 6 It is a left-side structural schematic diagram of a combined structure according to an embodiment of the utility model;

[0026] Figure 7 It is a schematic diagram of a front cross-sectional structure of a combined structure according to an embodiment of the utility model;

[0027] Figure 8 It is a structural schematic diagram of a load-bearing fixed end according to an embodiment of the utility model;

[0028] Fig. 9 It is a schematic flow chart of a construction method according to one embodiment of the utility model.

[0029] Description of main reference numerals:

[0030] 1-tension plate, 2-tension bar, 3-working anchor, 4-pressure plate, 5-nut, 6-spiral bar, 7-conical rubber sealing ring, 8-sealing ring, 9-fixed end sealing cover, 10-sealing pad, 11-locking nut, 12-center grouting pipe, 13-guide frame constraint ring, 14-guide bracket, 15-anti-corrosion medium, 16-extrusion sleeve / spring, 17-pressure pipe / extrusion spring, 18-bearing plate, 19-hexagonal nut, 20-busbar base material, 21-PE protective pipe, 22-isolation bracket, 23-bottom plate reinforcement, 24-anchor hole, 100-cushion layer, 200-bottom plate, 300-surface layer. DETAILED DESCRIPTION

[0031] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0032] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0033] like Figures 3 to 7 As shown, a combined structure according to a preferred embodiment of the utility model can be applied to the tension anchoring end of the prestressed anti-floating anchor rod, and the combined structure includes a pressure plate 4, a tension plate 1 and a tension bar 2.

[0034] The pressure plate 4 is used to be arranged at the cushion layer 100 or the bottom plate 200 of the building structure foundation. The pressure plate 4 can be connected to the busbar substrate 20 of the prestressed anti-floating anchor. The upper end of the busbar substrate 20 passes through the pressure plate 4 from bottom to top and is fixedly connected to the pressure plate 4 through the working anchor. The function of the laminate 4 is to bear the downward tension force of the busbar substrate after tensioning, and to transmit the tension force to the tension plate 1 through the tension bar 2, and the tension plate 1 jointly bears the tension force.

[0035] The tension plate 1 is used to be pressed onto the bottom plate 200 steel bars 23 at the top of the bottom plate 200. Specifically, the bottom plate 200 steel bars 23 refer to a steel mesh cage arranged horizontally inside the bottom plate 200. The tension plate 1 can be directly in contact with and connected to the bottom plate 200 steel bars 23 inside the bottom plate 200, or it can be arranged slightly higher than the bottom plate 200 steel bars 23, and the force transmission is achieved by using cement and other structures filled between the two. When multiple layers of bottom plate 200 steel bars are arranged in the bottom plate 200, it is preferably pressed onto the topmost bottom plate 200 steel bars 23 of the bottom plate 200. The tension plate 1 forms an integrated structure with the laminate 4 through the tie rod 2. The tension plate 1 is subjected to the downward pulling force of the tie rod 2, and the force is applied to the inside of the bottom plate 200, especially to the position where it is in direct contact with the bottom plate 200 steel bars 23 or indirectly transmitted.

[0036] The tie rod 2 is used to be arranged between the pressure plate 4 and the tension plate 1, the lower end of the tie rod 2 is fixedly connected to the pressure plate 4, and the upper end of the tie rod 2 is fixedly connected to the tension plate 1. The fixed connection method can be a detachable connection or a non-detachable connection, for example: the tie rod 2 can be in the form of a long bolt, the upper end of which is locked by a nut 5; it can also be in the form of a double-headed stud, both ends of which are locked by nuts 5 or the lower end is connected to the threaded hole on the long pressure plate 4; it can also be a connection form in which both ends are welded to the tension plate 1 and the pressure plate 4.

[0037] See also Figures 5 to 7 In some embodiments, the tension plate 1 and the pressure plate 4 can be plate-like structures or disc-like structures, and the top view shape can be but not limited to circular, elliptical or polygonal, or even irregular. The center hole of the pressure plate 4 can be a large hole, and one or more busbar substrates 20 and the central grouting pipe 12 can pass through the large hole. If the busbar substrate 20 uses multiple steel strands, it can also be arranged as a center hole and multiple busbar perforations around the center hole (or other similar layout structures, or no grouting holes are arranged inside the laminate 4, or the grouting holes are independently arranged outside the present combined structure), each busbar perforation is used for the steel strand to pass through, and the center hole is used for the central grouting pipe 12 to pass through. The tie rod 2 can be a slender columnar structure, and its cross section can be but not limited to circular, elliptical or polygonal. The number of tie rods 2 is generally multiple, and only four are shown in this embodiment, but the utility model is not limited to this. The multiple tie rods 2 are preferably evenly distributed and arranged around the center of the tension plate 1 and the pressure plate 4.

[0038] In some embodiments, the positions of the pressure plate 4 and the tension plate 1 are not fixed. For example, but not limited to, the pressure plate 4 can be set in the cushion layer 100, at the junction of the cushion layer 100 and the bottom plate 200, or inside the bottom plate 200. The pressure plate 4 can be set at a relatively lower position in the bottom plate 200, or even pressed on the steel bars of the lower bottom plate 200 of the bottom plate 200. The tension plate 1 can be set at an upper position inside the bottom plate 200, for example, pressed on the steel bars of the upper bottom plate 200. As long as the pressure plate 4 can bear the downward prestress of the busbar base material, and the prestress is also transferred from the bar 2 to the tension plate 1 and acts on the inside and / or upper part of the bottom plate 200, especially on the steel bars of the bottom plate 200 inside the bottom plate 200, it should be deemed to fall within the scope of protection of this patent.

[0039] See also Figure 4 In some embodiments, the pressure plate 4 can be set inside the cushion layer 100, or it can be set at the junction of the cushion layer 100 and the bottom plate 200, that is, the pressure plate 4 is pressed on the surface of the cushion layer 100; or it can also be set inside the bottom plate 200.

[0040] In some embodiments, if the pressure plate 4 is arranged inside the cushion layer 100, during construction, a cement pier with a larger area than the pressure plate 4 is generally cast within the preset range of the cushion layer 100, such as but not limited to 400×400mm or 500×500mm, with a thickness equivalent to or thicker than the cushion layer 100, and then the pressure plate 4 is installed on the cement pier, and connected to the busbar substrate 20 through the working anchor 3, and finally the cement pier and the pressure plate 4 are cast together inside the cushion layer 100. If the pressure plate 4 is arranged between the cushion layer 100 and the bottom plate 200, then the pressure plate 4 is directly pressed on the cast cushion layer 100, and connected to the busbar substrate 20 through the working anchor 5. If the pressure plate 4 is further lifted and set inside the bottom plate 200, some changes must be made to the structure of the pressure plate 4. Because the pressure plate 4 is set inside the bottom plate 200, the busbar substrate 20 is generally tensioned after the bottom plate 200 is cast. At this time, a tensioning space must be reserved above the pressure plate 4 inside the bottom plate 200.

[0041] See also Figures 5 to 7In some embodiments, the pressure plate 4 of the combined structure of this embodiment mainly bears the downward tension (i.e., the buoyancy of groundwater) transmitted by the busbar substrate 20. Due to the setting of the combined structure, the tension bar 2 connects the pressure plate 4 and the tension plate 1 as a whole, and thus transmits the downward tension to the tension plate 1. However, the tension plate 1 is also combined with the bottom plate 200 steel bars 23 of the bottom plate 200 as a whole. Therefore, due to the setting of the combined structure, the downward prestressed tension transmitted by the busbar substrate 20 is distributed to the entire bottom plate 200 and / or the cushion layer 100 through the pressure plate 4, the tension bar 2, the tension plate 1 and the bottom plate 200 steel bars 23, so that the force of the tension anchoring end of the prestressed anti-floating anchor on the bottom plate 200 and the cushion layer 100 is more balanced and reasonable, avoiding excessive local force and causing damage such as cracks at the stress points of the bottom plate 200 and / or the cushion layer 100, thereby causing a series of seepage problems such as groundwater seeping along the cracks.

[0042] In some embodiments, the busbar substrate 20 includes unbonded steel strands, slow-bonded steel strands or fine-rolled threaded steel bars, that is, the combined structure is applicable to the above-mentioned unbonded steel strands (the steel wires include a PE protective tube 21 outside), slow-bonded steel strands or fine-rolled threaded steel bars.

[0043] In some embodiments, the working anchor includes a working anchor and a working clip, etc., and the existing technology can be used. Its specific form can be found in application number 202322525433.6, and the patent name is the anchor structure of the anti-seepage and water-stopping structure at the tensioning end of the prestressed anti-floating anchor.

[0044] like Figure 8 See also Figure 3In order to achieve the above-mentioned another purpose, the utility model also provides a prestressed anti-floating anchor structure, which includes the combined structure as described above, and the prestressed anti-floating anchor structure also includes a busbar substrate 20, a plurality of isolation brackets 22, an upper sealing device and a load-bearing fixed end; the upper end of the busbar substrate 20 is fixedly connected to the tension anchor end; a plurality of isolation brackets 22 are arranged at a plurality of middle positions of the busbar substrate 20 (mainly used for a plurality of unbonded / slowly bonded steel strands, if the busbar substrate 20 uses fine-rolled threaded steel, the isolation bracket 22 may not be arranged), the isolation bracket is generally a disc-shaped structure, and a plurality of isolation brackets are evenly distributed around it. The notch is generally arc-shaped for each steel strand to pass through, and multiple steel strands have been reasonably isolated. An intermediate hole is generally provided in the middle of the isolation bracket, which is basically used for the central grouting pipe to pass through; the upper sealing device is arranged at the connection between the unbonded / slowly bonded steel strand and the pressure plate 4, and the upper sealing device generally adopts a filler such as expansion rubber to fill the gap between the pressure plate 4 and the busbar substrate 20. The expansion rubber expands when it encounters water, which can prevent groundwater from penetrating upward along the above-mentioned gap; the load-bearing fixed end is arranged at the lower end of the prestressed anti-floating anchor structure, and the load-bearing fixed end is arranged at the lowest end and fixed together with the rock layer below the groundwater.

[0045] In some embodiments, the bearing fixed end includes a bearing plate 18, an extrusion sleeve / spring 16, a fixed end sealing cover 9 and a central grouting pipe 12; the lower end of the busbar substrate 20 is fixedly connected to the bearing plate 18; the extrusion sleeve / spring 16 is extruded and fixed to the portion of the unbonded / slow-bonded steel strand passing through the bearing plate 18 from top to bottom; the fixed end sealing cover 9 is sealingly installed on the lower surface of the bearing plate 18, and the cover is arranged on the portion of the unbonded / slow-bonded steel strand passing through the bearing plate 18 from top to bottom and the periphery of the extrusion sleeve / spring 16; the central grouting pipe 12 passes through the bearing plate 18 and the fixed end sealing cover 9 at the same time, and the bearing plate 18 and the fixed end sealing cover 9 are fixedly connected together by a locking nut 11.

[0046] In some embodiments, the bearing fixed end also includes multiple conical rubber sealing rings 7, sealing pads 10 and sealing rings 8; multiple conical rubber sealing rings 7 are arranged at the connection between the unbonded / slow-bonded steel strands and the central grouting pipe 12 and the bearing plate 18; the sealing pad 10 is arranged at the connection between the central grouting pipe 12 and the fixed end sealing cover 9 and the locking nut; the sealing ring 8 is arranged at the connection between the fixed end sealing cover 9 and the bearing.

[0047] In some embodiments, the bearing fixed end also includes a guide bracket 14, a guide bracket constraint ring 13, an anti-corrosion medium 15 and a spiral rib 6; the upper end of the guide bracket 14 is fixedly connected to the bearing plate 18 through a compression tube / extrusion spring 17 and a hexagonal nut 19; the guide bracket constraint ring 13 is hooped at the lower end of the guide bracket 14; the anti-corrosion medium 15 is filled in the fixed end sealing cover 9; the spiral rib 6 is sleeved on the outside of multiple non-bonded / slow-bonded steel strands and is located above the bearing plate 18.

[0048] In some embodiments, the bearing fixed end may also adopt existing technology, such as the structure of the bearing anchoring end of the patent application number 202011341457.0 and the patent name of the non-bonded prestressed anti-seepage anchor bearing body.

[0049] like Fig. 9 As shown, in order to achieve another purpose mentioned above, the utility model provides a construction method of a combined structure and a prestressed anti-floating anchor structure, and the construction method can be applied to the construction of the prestressed anti-floating anchor structure including the combined structure as mentioned above, and the construction method includes: for the busbar substrate that has completed the casting process, a pressure plate and a working anchor are installed at the cushion layer 100 or the bottom plate 200 (the so-called busbar substrate that has completed the casting process, that is: the combined installation of the load-bearing fixed end and the lowering of it into the anchor hole together with the busbar substrate 20, and the completion of the cement slurry injection into the anchor hole and the maintenance period); tensioning the busbar substrate 20; cutting off the excess part of the busbar substrate 20; installing the tie rod 2 and the tension plate 1; tying the bottom plate 200 steel bars 23 and connecting the tension plate 1 with the bottom plate 200 steel bars 23; and casting the concrete layer of the bottom plate 200.

[0050] In some embodiments, the construction method mainly includes the tensioning process of the busbar base material 20 , the binding of the tie rods 2 , the tension plate 1 , and the steel bars 23 of the bottom plate 200 , and the pouring process of the bottom plate 200 .

[0051] In some implementations, the construction method of this embodiment performs tensioning on the busbar substrate 20 after the bearing fixed end of the prestressed anti-floating anchor structure is fixed. At this time, the downward tension transmitted by the busbar substrate 20 is still mainly borne by the cushion layer 100 and the pressure plate 4. Then the tie rod 2 and the tension plate 1 are installed, and the bottom plate 200 steel bars are tied at the same time. The tension plate 1 is preferably pressed on the upper bottom plate 200 steel bars 23 of the bottom plate 200. After the bottom plate 200 is cast, the combined structure forms a whole with the cushion layer 100 and the bottom plate 200 to jointly bear the downward tension transmitted by the busbar substrate 20. The bearing effect of this solution is far better than that of the above-mentioned method. Figure 1 and Figure 2The tension anchor end of the prior art is not connected to the steel bars of the bottom plate 200 , or is only connected to the steel bars of the bottom plate 200 at the lower layer. The tension anchor end does not completely form an integral bearing effect with the cushion layer 100 and the bottom plate 200 .

[0052] See also Fig. 9 In some embodiments, before the maintenance period, the following steps are included: drilling at the cushion layer 100 of the building structure foundation; cleaning the drilled hole to form an anchor hole; assembling the lower end of the busbar substrate 20 and the load-bearing fixed end; lowering the prestressed anti-floating anchor structure with the assembled load-bearing fixed end to the predetermined depth of the anchor hole and positioning and fixing it; grouting between the inner wall of the anchor hole and the busbar substrate 20 and the load-bearing fixed end; and performing maintenance according to the maintenance period specified in the design; wherein grouting between the inner wall of the anchor hole and the busbar substrate 20 and the load-bearing fixed end is to inject C35 cement slurry using an underwater concrete pouring construction process. This process mainly includes the drilling of the anchor hole, the installation of the load-bearing fixed end, the installation of the isolation bracket 22, etc., and the pouring of concrete in the anchor hole.

[0053] In summary, the combined structure and prestressed anti-floating anchor structure of the utility model have the following advantages: the combined structure of the present invention includes a pressure plate arranged at the cushion layer and the bottom plate, a tension plate connected to the bottom plate steel bars, and tie rods fixedly connected between the tension plate and the pressure plate. The tensioning anchor end of the prestressed anti-floating anchor structure including the combined structure is combined with the cushion layer and the bottom plate into an integrated structure, so that the force on the tensioning anchor end is more balanced and reasonable, and the ability of the prestressed anti-floating anchor structure to resist the buoyancy of groundwater can be greatly enhanced. In addition, according to the characteristics of the combined structure, the construction method installs tie rods and tension plates after the tensioning process, and connects the tension plates to the bottom plate steel bars, so that the bearing capacity of the pressure plate is transmitted to the long tension plate and the bottom plate steel bars through the tie rods, completely making the combined structure and the bottom plate an integrated structure.

[0054] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. The scope of the utility model is intended to be defined by the claims and their equivalents.

Claims

1. A combined structure, which can be applied to the tension anchoring end of a prestressed anti-floating anchor, characterized in that: The combined structure comprises: A pressure plate, which is used to be arranged at the cushion layer or bottom plate of the building structure foundation, the pressure plate can be connected to the busbar substrate of the prestressed anti-floating anchor rod, the upper end of the busbar substrate passes through the pressure plate from bottom to top, and is fixedly connected to the pressure plate through a working anchor; A tension plate, which is used to be pressed on the bottom plate reinforcement on the top of the bottom plate; and The tie rod rib is used to be arranged between the pressure-bearing plate and the tension-bearing plate, the lower end of the tie rod rib is fixedly connected to the pressure-bearing plate, and the upper end of the tie rod rib is fixedly connected to the tension-bearing plate.

2. The combined structure according to claim 1, characterized in that: The pressure-bearing plate is arranged in the cushion layer, at the junction between the cushion layer and the base plate, or in the base plate.

3. The combined structure according to claim 1, characterized in that: The busbar substrate includes unbonded steel strands, slow-bonded steel strands or precision-rolled threaded steel.

4. The combined structure according to claim 1, characterized in that: The working anchor comprises a working anchor and a working clip.

5. A prestressed anti-floating anchor structure, comprising the combined structure according to any one of claims 1 to 4, characterized in that: The prestressed anti-floating anchor structure also includes: A busbar substrate, the upper end of which is fixedly connected to the tension anchoring end; A plurality of isolation brackets, which are arranged at a plurality of middle positions of the busbar substrate, and the isolation brackets are used to reasonably isolate a plurality of the busbar substrates; an upper sealing device, which is arranged at the connection between the busbar substrate and the pressure plate, and is used to prevent groundwater from penetrating upward; and The load-bearing fixed end is arranged at the lower end of the prestressed anti-floating anchor structure.

6. The prestressed anti-floating anchor structure according to claim 5, characterized in that: The load-bearing fixed end comprises: A bearing plate, to which the lower end of the busbar substrate is fixedly connected; An extrusion sleeve / spring, which is extruded and fixed at the portion of the busbar substrate passing through the bearing plate from top to bottom; A fixed end sealing cover, which is sealingly mounted on the lower surface of the bearing plate and covers the portion of the busbar substrate passing through the bearing plate from top to bottom and the periphery of the extrusion sleeve / spring; and The central grouting pipe passes through the bearing plate and the fixed end sealing cover at the same time, and the bearing plate and the fixed end sealing cover are fixedly connected together by a locking nut.

7. The prestressed anti-floating anchor structure according to claim 6, characterized in that: The bearing fixed end also includes: A plurality of conical rubber sealing rings, which are arranged at the connection between the busbar substrate and the central grouting pipe and the bearing plate; A sealing gasket, which is arranged at the connection between the central grouting pipe and the fixed end sealing cover and the locking nut; and A sealing ring is arranged at the connection between the fixed end sealing cover and the bearing.

8. The prestressed anti-floating anchor structure according to claim 6, characterized in that: The bearing fixed end also includes: A guide bracket, the upper end of which is fixedly connected to the bearing plate via a compression tube / extrusion spring and a hexagonal nut; A guide frame restraining ring, the hoop of which is arranged at the lowermost end of the guide frame; An anti-corrosion medium is filled in the interior of the fixed end sealing cover; and The spiral rib is sleeved on the outside of the plurality of busbar substrates and is located above the bearing plate.

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