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 at 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 an upper-layer 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] At present, there are also some practices that add anchoring devices to the tension anchoring ends, which can achieve uniform prestressing of the entire length of the prestressed steel strands, thereby improving the overall stability of the basement floor structure; and because the anchoring devices of the anti-floating anchor rods are arranged in the floor area used to construct the basement floor 200, the basement floor 200 can be poured in one go, and the anchoring end of the anti-floating anchor rod is completely buried in the basement floor 200 and consolidated with it, so that the basement floor can be poured and constructed 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 inside the bottom plate structure, it is mainly arranged in the middle and lower part of the floor, and is not integrated with the steel bars on the top of the bottom plate. For example, the stress area of ​​the circle 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, 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] Another object of the utility model is to provide a construction method of a prestressed anti-floating anchor structure including the combined structure.

[0012] 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 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 upper 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.

[0013] In a preferred embodiment, the pressure plate includes a steel casing, the lower end of the steel casing is fixedly connected to the upper plane of the pressure plate, the working anchor is arranged in the steel casing, and the inner wall of the steel casing and the working anchor and the busbar substrate are filled with sealing grouting material.

[0014] In a preferred embodiment, the upper end of the steel casing is higher than the upper surface of the base plate, and the top surface of the sealing grouting material in the steel casing is coated with epoxy resin.

[0015] In a preferred embodiment, the busbar substrate includes unbonded steel strands, slow-bonded steel strands or precision-rolled rebar.

[0016] To achieve the above-mentioned other purpose, the utility model also provides a prestressed anti-floating anchor structure including a combined structure as mentioned above, the prestressed anti-floating anchor structure also includes a busbar substrate, a waterstop steel ring, 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; the waterstop steel ring is arranged at the cushion layer and the bottom plate of the building foundation, and is located below the lower layer of steel bars of the bottom plate, and the busbar substrate passes through the waterstop steel ring, and the waterstop steel ring can prevent part of the groundwater from seeping upward; a plurality of isolation brackets are arranged at a plurality of unbonded / slow-bonded steel strands, and the isolation brackets can effectively and reasonably isolate the plurality of steel strands; the upper sealing device is arranged at the connection between the unbonded / slow-bonded steel strands and the pressure plate, and the upper sealing device can prevent groundwater from seeping upward along the gaps in the outer wall of the busbar substrate; the load-bearing fixed end is arranged at the lower end of the prestressed anti-floating anchor structure.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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

[0021] 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;

[0022] 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;

[0023] 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;

[0024] Figure 4 It is a schematic diagram of the overall structure of a tension anchoring end according to an embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of the installation structure of the combined structure according to one embodiment of the utility model;

[0026] Figure 6 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 7 is a schematic diagram of a top cross-sectional structure of a combined structure according to an embodiment of the utility model;

[0028] Figure 8 is a schematic diagram of a cross-sectional structure viewed from below of a combined structure according to an embodiment of the utility model;

[0029] Fig. 9 It is a schematic diagram of the overall structure of a load-bearing fixed end according to an embodiment of the utility model;

[0030] Fig.10 It is a schematic flow chart of a construction method according to one embodiment of the utility model.

[0031] Description of main reference numerals:

[0032] 1-nut, 2-tension plate, 3-steel casing, 4-tension rod, 5-working anchor, 6-pressure plate, 7-grouting pipe, 8-waterstop steel ring, 9-C35 cement slurry, 10-spiral rib, 11-conical rubber sealing ring, 12-sealing ring, 13-fixed end sealing cover, 14-sealing pad, 15-locking nut, 16-guide frame constraint ring, 17-guide bracket, 18-anti-corrosion medium, 19-extrusion sleeve / spring, 20-pressure pipe / extrusion spring, 21-bearing plate, 22-hexagonal nut, 23-busbar base material, 24-PE protective pipe, 25-isolation bracket, 26-bottom plate steel bar, 27-epoxy resin, 28-C40 waterproof grouting material, 100-cushion, 200-bottom plate, 300-surface layer. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] like Figures 3 to 8As shown, according to a combined structure of a preferred embodiment of the utility model, the combined structure can be applied to the tension anchoring end of the prestressed anti-floating anchor rod, and the combined structure includes a pressure plate 6, a tension plate 2 and a tie bar 4; the pressure plate 6 is used to be arranged at the bottom plate 200 of the building structure foundation, and the pressure plate 6 can be connected to the busbar substrate 23 of the prestressed anti-floating anchor rod, and the upper end of the busbar substrate 23 passes through the pressure plate 6 from bottom to top, and is fixedly connected to the pressure plate 6 through the working anchor 5; the tension plate 2 is used to be pressed on the upper bottom plate 200 steel bars 26 at the top of the bottom plate 200, that is, the tension plate 2 is to be connected to the bottom plate 200 steel bars 26 of the bottom plate 200 as a whole, and is preferably pressed on the upper bottom plate 200 steel bars 26 of the bottom plate 200; the tie bar 4 is used to be arranged between the pressure plate 6 and the tension plate 2, the lower end of the tie bar 4 is fixedly connected to the pressure plate 6, and the upper end of the tie bar 4 is fixedly connected to the tension plate 2. The tie rod 4 can be in the form of a long bolt, with the upper end locked by a nut 1; it can also be in the form of a double-headed stud, with both ends locked by nuts 1 or the lower end connected to the threaded hole on the pressure plate 6; it can also be in the form of a connection in which the two ends are welded to the tension plate 2 and the pressure plate 6.

[0036] See also Figures 6 to 8 In some embodiments, the tension plate 2 and the pressure plate 6 may be plate-like structures or disc-like structures, and the top view shape may be, but is not limited to, circular, elliptical or polygonal, or even irregular. The center hole of the pressure plate 6 may be a large hole, through which the busbar substrate 23 and the central grouting pipe 7 may pass. If the busbar substrate 23 uses multiple steel strands, it may also be configured as a center hole and multiple busbar perforations surrounding the center hole, each busbar perforation being used for the steel strand to pass through, and the center hole being used for the central grouting pipe 7 to pass through. The tie rod 2 may be a slender columnar structure, and its cross section may be, but is 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 thereto. The multiple tie rods 2 are preferably evenly distributed and arranged around the periphery of the center of the tension plate 2 and the pressure plate 6.

[0037] In some embodiments, the setting positions of the pressure plate 6 and the tension plate 2 are not fixed. For example, but not limited to, the pressure plate 6 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. This embodiment shows that the pressure plate 6 is set inside the bottom plate 200. The position of the pressure plate 6 can be set at a relatively lower position in the bottom plate 200, or even pressed on the steel bars 26 of the lower bottom plate 200 of the bottom plate 200. The tension plate 2 can be set at an upper position inside the bottom plate 200, for example, pressed on the steel bars 26 of the upper bottom plate 200.

[0038] In some embodiments, if the pressure plate 6 is arranged inside the cushion layer 100100, during construction, a cement pier with a larger area than the pressure plate 6 is generally cast within the preset range of the cushion layer 100100, such as but not limited to 400×400mm or 500×500mm, with a thickness equivalent to or thicker than the cushion layer 100100, and then the pressure plate 6 is installed on the cement pier, and connected to the busbar substrate 23 through the working anchor 5, and finally the cement pier and the pressure plate 6 are cast together inside the cushion layer 100. If the pressure plate 6 is arranged between the cushion layer 100100 and the bottom plate 200, then the pressure plate 6 is directly pressed on the cast cushion layer 100100, and connected to the busbar substrate 23 through the working anchor 5.

[0039] See also Figures 3 to 5 In some embodiments, the pressure plate 6 of the combined structure of this embodiment mainly bears the downward tension (i.e., the buoyancy of groundwater) transmitted by the busbar base material 23. Due to the setting of the combined structure, the tie rods 4 connect the pressure plate 6 and the tension plate 2 as a whole, and thus transmit the downward tension to the tension plate 2. However, the tension plate 2 is also combined with the bottom plate 200 steel bars 26 of the bottom plate 200 as a whole. Therefore, due to the setting of the combined structure, the downward tension transmitted by the busbar base material 23 is distributed to the entire bottom plate 200 and the cushion layer 100 through the pressure plate 6, the tie rods 4, the tension plate 2 and the bottom plate 200 steel bars 26, so that the force on the tension anchoring end of the prestressed anti-floating anchor is more balanced and reasonable.

[0040] See also Figure 5 and Figure 6 In some embodiments, the pressure plate 6 includes a steel casing 3, the lower end of the steel casing 3 is fixedly connected to the upper plane of the pressure plate 6, the working anchor 5 is arranged in the steel casing 3, and the inner wall of the steel casing 3 and the working anchor 5 and the busbar substrate 23 are filled with sealing grouting material.

[0041] In some embodiments, the connection between the steel casing 3 and the pressure plate 6 can be in various forms. First, the connection can be as follows: Figure 6 The welding form shown in the figure. A boss can also be set on the pressure plate 6, an external thread is set on the boss, and an internal thread is set at the bottom end of the steel casing 3, and the two are connected by threads. In addition, a clamping or bonding form can also be adopted, and the utility model is not limited to this.

[0042] In some embodiments, the cross-sectional shape of the steel casing 3 may also be in various forms, such as but not limited to circular, elliptical or polygonal.

[0043] In some embodiments, the perforations of the busbar substrate 23 on the pressure plate 6 may also be various, and may be multiple perforations with the same number of busbar substrates 23, with a central grouting pipe perforation reserved in the middle. Alternatively, a large hole may be used, through which multiple busbar substrates 23 and the central grouting pipe all pass.

[0044] In some embodiments, the upper end of the steel casing 3 is higher than the upper surface of the bottom plate 200, and the top surface of the sealing grouting material in the steel casing 3 is coated with epoxy resin 27. The top of the steel casing 3 is higher than the upper surface of the bottom plate 200 mainly because when the concrete of the bottom plate 200 is poured, the concrete is prevented from being transferred into the steel casing 3 to affect the subsequent tensioning process. However, the top of the steel casing 3 is not absolutely higher than the upper surface of the bottom plate 200, and can also be slightly lower. It is just that when the bottom plate 200 is poured, some methods need to be used to block the upper opening of the steel casing 3 to prevent concrete from falling in.

[0045] In some embodiments, the busbar substrate 23 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 wire includes a PE protective tube 24 outside), slow-bonded steel strands or fine-rolled threaded steel bars.

[0046] In some embodiments, the working anchor 5 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.

[0047] like Fig. 9 See also Figure 3To achieve the above-mentioned other purpose, the utility model also provides a prestressed anti-floating anchor structure including a combined structure as described above, the prestressed anti-floating anchor structure also includes a busbar substrate 23, a water-stop steel ring 8, a plurality of isolation brackets 25, an upper sealing device and a load-bearing fixed end; the upper end of the busbar substrate 23 is fixedly connected to the tension anchor end; the water-stop steel ring 8 is arranged at the cushion layer 100 and the bottom plate 200 of the building foundation, and is located below the steel bars 26 of the lower bottom plate 200 of the bottom plate 200, the busbar substrate 23 passes through the water-stop steel ring 8, the main body of the water-stop steel ring 8 is a cylindrical structure, and a butterfly-shaped disc extends vertically outward on the outer wall of the cylindrical structure, the water-stop steel ring 8 is arranged between the cushion layer 100 and the floor, and its butterfly-shaped disc can prevent a part of the groundwater from penetrating upward, and at the same time can also enhance the strength of the overall anchor structure. In addition, the butterfly disc can also be slightly higher than the upper surface of the cushion layer 100100 by placing a support between the butterfly disc and the cushion layer 100100. In this way, the butterfly disc can be cast inside the base plate 200 when the base plate 200 is cast, so that the waterproof penetration effect of the construction is better. Multiple isolation brackets 25 are mainly used to be set at (multiple unbonded / slow-bonded steel strands). The axial viewing angle of the isolation bracket 25 can generally be a plum petal-shaped structure, and multiple arc-shaped notches are evenly distributed on the periphery for the insertion of each steel strand. By the way, multiple steel strands can be reasonably isolated. At the same time, an intermediate hole is set in the middle of the isolation bracket 25 for the central grouting pipe 7 to be inserted; the upper sealing device is set at the connection between the unbonded / slow-bonded steel strand and the pressure plate 6. The upper sealing device generally uses 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 comes into contact with water, which can prevent groundwater from penetrating upward along the above-mentioned gap; the load-bearing fixed end is set at the lower end of the prestressed anti-floating anchor structure, and the load-bearing fixed end is set at the lowest end and fixed to the rock layer below the groundwater.

[0048] In some embodiments, the setting position of the water-stop steel ring 8 can also be relatively flexible. It can be set in the cushion layer 100 or in the base plate 200, but it is preferably set at the junction of the cushion layer 100 and the base plate 200. The function of the water-stop steel ring 8 is mainly to organize groundwater to seep upward along the gap between the busbar substrate 23 and the concrete.

[0049] In some embodiments, spiral ribs (not shown) may be further provided around the busbar substrate 23 between the water-stop steel ring 8 and the pressure plate 6. The spiral ribs may strengthen the bonding strength between the busbar substrate 23 and the bottom plate 200, so that the force is more secure when the busbar substrate 23 is tensioned.

[0050] See also Fig. 9In some embodiments, the bearing fixed end includes a bearing plate 21, an extrusion sleeve / spring 19, a fixed end sealing cover 13 and a central grouting pipe 7; the lower end of the busbar substrate 23 is fixedly connected to the bearing plate 21; the extrusion sleeve / spring 19 is extruded and fixed to the portion of the unbonded / slow-bonded steel strand passing through the bearing plate 21 from top to bottom; the fixed end sealing cover 13 is sealed and installed on the lower surface of the bearing plate 21, and the cover is arranged on the portion of the unbonded / slow-bonded steel strand passing through the bearing plate 21 from top to bottom and the periphery of the extrusion sleeve / spring 19; the central grouting pipe 7 passes through the bearing plate 21 and the fixed end sealing cover 13 at the same time, and the bearing plate 21 and the fixed end sealing cover 13 are fixedly connected together by a locking nut.

[0051] In some embodiments, the bearing fixed end also includes multiple conical rubber sealing rings 11, sealing pads 14 and sealing rings 12; multiple conical rubber sealing rings 11 are arranged at the connection between the unbonded / slow-bonded steel strands and the central grouting pipe 7 and the bearing plate 21; the sealing pad 14 is arranged at the connection between the central grouting pipe 7 and the fixed end sealing cover 13 and the locking nut; the sealing ring 12 is arranged at the connection between the fixed end sealing cover 13 and the bearing.

[0052] In some embodiments, the bearing fixed end also includes a guide bracket 17, a guide bracket constraint ring 16, an anti-corrosion medium 18 and a spiral rib 10; the upper end of the guide bracket 17 is fixedly connected to the bearing plate 21 through a compression tube / extrusion spring and a hexagonal nut; the guide bracket constraint ring 16 is hooped at the lower end of the guide bracket 17; the anti-corrosion medium 18 is filled in the fixed end sealing cover 13; the spiral rib 10 is sleeved on the outside of multiple non-bonded / slow-bonded steel strands and is located above the bearing plate 21.

[0053] 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.

[0054] like Fig.10As shown, in order to achieve the above-mentioned another purpose, the utility model provides a construction method of a prestressed anti-floating anchor structure including the combined structure, and the construction method can be applied to the construction of the combined structure and the prestressed anti-floating anchor structure as mentioned above, and the construction method comprises: assembling and installing the load-bearing fixed end and lowering it into the anchor hole together with the busbar substrate 23, and at the same time completing the cement slurry injection into the anchor hole and the maintenance period, installing a water-stop steel ring 8 at the cushion layer 100 and the bottom plate 200, and passing the busbar substrate 23 through the water-stop steel ring 8; at the cushion layer 100 and the bottom plate 200 Install the pressure plate 6, the tie rod 4 and the tension plate 2, and pass the upper end of the busbar base material 23 through the pressure plate 6 into the steel casing 3, and install the working anchor 5 in the steel casing 3; tie the bottom plate 200 steel bars 26 and connect the tension plate 2 with the bottom plate 200 steel bars 26; pour the concrete layer of the bottom plate 200; after the concrete of the bottom plate 200 solidifies to the standard, tension the busbar base material 23; cut off the excess busbar base material 23; inject waterproof and anti-corrosion slurry into the steel casing 3; and apply epoxy resin 27 on the surface of the waterproof and anti-corrosion slurry.

[0055] See also Figures 3 to 5 In some embodiments, the construction method of this embodiment is to install a water-stop steel ring 8, a tension plate 2, a tension bar 4 and a pressure plate 6 after the bearing fixed end of the prestressed anti-floating anchor structure is fixed, and then tie the bottom plate 200 steel bars 26 of the bottom plate 200, and the tension plate 2 is preferably pressed on the upper bottom plate 200 steel bars 26, and the pressure plate 6 can be pressed on the lower bottom plate 200 steel bars, or can be set above the lower bottom plate 200 steel bars, and the water-stop steel ring 8 is preferably set below the lower bottom plate 200 steel bars. Finally, after the concrete of the bottom plate 200 is poured and solidified to meet the design requirements, the working anchor is installed in the steel casing 3 and the busbar substrate 23 is tensioned. After the tensioning treatment meets the design requirements, the excess busbar substrate is removed, and the waterproof and anti-corrosion slurry is poured into the interior of the steel casing 3. After the waterproof and anti-corrosion slurry is completely solidified, epoxy resin is applied on its surface. Such a process design can ensure that the tension anchor end including the combined structure forms a whole with the cushion layer 100 and the bottom plate 200, which is more balanced and reasonable in bearing the downward tension transmitted by the busbar substrate. Figure 1 and Figure 2 The tensioning 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 tensioning anchor end does not completely form an integral bearing effect with the cushion layer 100 and the bottom plate 200 .

[0056] See also Figure 4 and Figure 5In some embodiments, after the busbar substrate 23 is tensioned, it is generally necessary to cut off the excess busbar substrate 23. However, in this embodiment, it is relatively difficult to cut off the busbar substrate 23 remaining in the steel casing 3 because the diameter of the steel casing 3 is small. However, some other methods can also be adopted, such as but not limited to bending the busbar substrate 23 that is difficult to cut off and inserting it into the steel casing 3. In this embodiment, the waterproof and anti-corrosion slurry poured into the steel casing 3 can be C40 waterproof grouting material.

[0057] In some embodiments, the construction method before the maintenance period also includes: 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 23 and the load-bearing fixed end; lowering the prestressed anti-floating anchor structure with the assembled load-bearing fixed end to a predetermined depth of the anchor hole and positioning and fixing it; grouting between the inner wall of the anchor hole and the busbar substrate 23 and the load-bearing fixed end; performing maintenance according to the maintenance period specified in the design; wherein the grouting between the inner wall of the anchor hole and the busbar substrate 23 and the load-bearing fixed end is to inject C35 cement slurry using an underwater concrete pouring construction process.

[0058] 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.

[0059] 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 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 upper bottom plate steel bars 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 plate includes a steel casing, the lower end of which is fixedly connected to the upper plane of the pressure plate, the working anchor is arranged in the steel casing, and the inner wall of the steel casing and the space between the working anchor and the busbar substrate are filled with sealing grouting material.

3. The combined structure according to claim 2, characterized in that: The upper end of the steel casing is higher than the upper surface of the bottom plate, and the top surface of the sealing grouting material in the steel casing is coated with epoxy resin.

4. 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.

5. A prestressed anti-floating anchor structure, comprising the combined structure according to any one of claims 1 to 4, wherein the combined structure is arranged at the tension anchor end, and is 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 water-stop steel ring is arranged at the cushion layer of the building foundation and the bottom plate, and is located below the lower layer of steel bars of the bottom plate. The busbar substrate passes through the water-stop steel ring, and the water-stop steel ring can prevent a portion of groundwater from penetrating upwards; A plurality of isolation brackets, which are arranged on 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 is extruded and fixed at the portion where the unbonded / slowly bonded steel strand passes 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 is arranged on the portion of the unbonded / slowly bonded steel strand 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 fixing end also includes: A plurality of conical rubber sealing rings, which are arranged at the connection between the non-bonded / slowly-bonded steel strands 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 reinforcement is sleeved on the outside of the plurality of the non-bonded / slowly-bonded steel strands and is located above the bearing plate.

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