A precast, wind turbine foundation and a method of grouting a horizontal joint of a wind turbine foundation

Abstract

The present application provides a prefabricated part, a wind power foundation and a wind power foundation horizontal joint grouting method. The wind power foundation horizontal joint grouting method comprises the following steps: placing the spliced wind power foundation on a cushion layer so that a horizontal joint is formed between the wind power foundation and the cushion layer; grouting into the grouting hole in the prefabricated part so that the grout fills at least part of the horizontal joint; and grouting into the joint between two adjacent prefabricated parts so that the grout fills at least part of the horizontal joint. Therefore, the wind power foundation horizontal joint grouting method has the advantages of facilitating grouting, sufficient and uniform grout filling, and a more stable wind power foundation.

Description

Technical Field

[0001] This invention relates to the field of wind power foundation technology, specifically to a prefabricated component, a wind power foundation, and a method for grouting horizontal joints in a wind power foundation. Background Technology

[0002] With the continuous advancement of wind power generation technology, the single-unit capacity of wind turbine generators is increasing, and the foundations for these generators are also becoming larger. In related technologies, wind turbine foundations are typically constructed through on-site casting, which is time-consuming, difficult to control in terms of quality, and costly. Precast assembled foundations, on the other hand, can save on material usage and shorten the construction period. However, precast assembled foundations are composed of several precast components. Because a horizontal joint of 20-50mm thickness exists between the foundation slab and the subbase after assembly, and the slab area is very large, uneven grouting density in this horizontal joint leads to uneven stress on the slab, resulting in instability in the wind turbine foundation. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a method for grouting precast components, wind turbine foundations, and horizontal joints in wind turbine foundations.

[0004] The wind turbine foundation horizontal joint grouting method of this invention, wherein the wind turbine foundation is formed by sequentially connecting multiple prefabricated components along the circumference, each prefabricated component has a grouting hole penetrating its base plate, and a joint is defined between two adjacent prefabricated components, including the following steps:

[0005] The assembled wind turbine foundation is placed on the cushion layer so that a horizontal joint is formed between the wind turbine foundation and the cushion layer;

[0006] Grout is injected into the grouting holes within the precast component so that the grout fills at least a portion of the horizontal joint;

[0007] Grout is injected into the joint so that the grout fills at least a portion of the horizontal joint.

[0008] Therefore, the wind power foundation horizontal joint grouting method according to the embodiments of the present invention has the advantages of easy grouting, full and uniform grout filling, so as to make the wind power foundation more stable.

[0009] In some embodiments, grouting is performed into the joints after grouting into the grouting holes within the precast component.

[0010] In some embodiments, the horizontal seam is divided into a plurality of intermediate regions that are circumferentially away from the corresponding seam and a plurality of edge regions that are circumferentially adjacent to the corresponding seam;

[0011] Multiple radially extending first compartment strips are placed between the wind turbine foundation and the cushion layer so that the first compartment strips can divide the horizontal seam below the corresponding precast component into a central region and two edge regions;

[0012] After grouting the middle area using the grouting holes, the edge area is grouted using the joints.

[0013] In some embodiments, a plurality of annular second compartment strips are placed between the wind power foundation and the cushion layer and are arranged to intersect each of the plurality of second compartment strips and each of the plurality of first compartment strips, so that the second compartment strips divide the intermediate region into a plurality of intermediate sub-regions and the edge region into a plurality of edge sub-regions;

[0014] After grouting each of the intermediate sub-regions using the grouting holes, grouting each of the edge sub-regions using the joints;

[0015] Grouting is performed sequentially from the inside out on multiple intermediate sub-regions, and grouting is performed sequentially from the inside out on multiple edge sub-regions.

[0016] In some embodiments, a plurality of vent holes communicating with the middle region of the horizontal seam are provided on the bottom plate of each precast component, and a plurality of first air guide grooves facing the middle region and communicating with the vent holes are provided on the bottom surface of the bottom plate of each precast component, so that the gas in the slurry in the middle region can be discharged from the horizontal seam in sequence through the first air guide grooves and the vent holes.

[0017] Multiple second air-guiding grooves are provided on the bottom surface of the base plate of each precast component, facing the edge area and communicating with the joint, so that the gas in the slurry in the edge area can be discharged from the horizontal joint in sequence through the second air-guiding grooves and the joint.

[0018] In some embodiments, in a cross-section in the vertical and up-down directions, the projection of the first air guide groove is connected to each edge and / or each corner of the projection of the corresponding intermediate sub-region, and the projection of the second air guide groove is connected to each edge and / or each corner of the projection of the corresponding edge sub-region.

[0019] In some embodiments, the wind power foundation is ring-shaped, and the axis of the wind power foundation is in the vertical direction;

[0020] Before grouting, the inner and outer sides of the horizontal joint are sealed with sealing strips to prevent grout from overflowing from both sides of the horizontal joint.

[0021] The present invention also proposes a precast component applicable to the above-mentioned grouting method for horizontal joints of wind power foundations. The precast component includes a base plate, a column, and a rib. The base plate is disposed on the outer periphery of the column and defines a stepped groove with the column. The rib is disposed in the stepped groove and connected to the base plate and the column. The base plate has grouting holes. The thickness direction of the base plate is a first direction along the first direction. The grouting holes penetrate the base plate along the first direction.

[0022] In some embodiments, the surface of the base plate facing away from the rib in the first direction is divided into a middle portion and two edge portions in the circumferential direction of the column, the middle portion being located between the two edge portions in the circumferential direction;

[0023] The middle part is provided with an exhaust hole that penetrates the bottom plate and a first air guide groove that communicates with the exhaust hole;

[0024] A second air guide groove is provided on the edge portion, and the second air guide groove penetrates the bottom plate on the circumferential side of the column.

[0025] The present invention also proposes a wind power foundation, wherein the wind power foundation is annular and includes multiple prefabricated components, the prefabricated components are as described above, and the wind power foundation is formed by sequentially connecting and assembling the multiple prefabricated components along the circumference, with a joint defined between two adjacent prefabricated components. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a wind power foundation according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of a wind turbine foundation placed on a cushion layer according to an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of a wind turbine foundation placed on a cushion layer according to an embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of a top view of a wind power foundation according to an embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of a top view of a wind power foundation according to an embodiment of the present invention.

[0031] Figure 6 yes Figure 5 Enlarged view of a specific area.

[0032] Figure 7 This is a schematic diagram of the first air guide groove according to an embodiment of the present invention.

[0033] Figure label:

[0034] Wind power foundation 100;

[0035] Precast component 1, base plate 11, middle part 111, edge part 112, column 12 and rib beam 13, grouting hole 14, joint 15, vent hole 16, first air guide groove 17, second air guide groove 18;

[0036] 2. Subbase layer; 21. Spacer block; 22. Hollow area;

[0037] Slurry 3;

[0038] Middle area 41, edge area 42;

[0039] First sub-bin bar 51, second sub-bin bar 52, blocking bar 53, first blocking bar 531, second blocking bar 532. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] The following description, with reference to the accompanying drawings, describes an embodiment of the precast component 1, an embodiment of the wind turbine foundation 100, and an embodiment of the grouting method for horizontal joints in the wind turbine foundation. For example... Figures 1 to 7 As shown, the wind power foundation 100 according to an embodiment of the present invention is annular and includes a plurality of prefabricated components 1 according to an embodiment of the present invention. The wind power foundation 100 is formed by sequentially connecting and assembling the plurality of prefabricated components 1 according to an embodiment of the present invention along the circumference. A joint 15 (with a thickness of 20 mm) is defined between two adjacent prefabricated components 1 (base plates 11) according to an embodiment of the present invention. Each prefabricated component 1 has a grouting hole 14 penetrating its base plate 11.

[0042] The grouting method for horizontal joints in wind turbine foundations according to embodiments of the present invention includes the following steps:

[0043] The assembled wind turbine foundation 100 is placed on the cushion layer 2 so that a horizontal joint is formed between the wind turbine foundation 100 and the cushion layer 2;

[0044] Grouting is performed into the grouting holes 14 within the precast component 1 so that the grout 3 fills at least a portion of the horizontal joint;

[0045] Grouting is performed into the joint 15 so that the grout 3 fills at least part of the horizontal joint.

[0046] The grouting method for horizontal joints of wind turbine foundations according to embodiments of the present invention utilizes grouting holes 14 and dividing joints 15 within prefabricated components 1 to grout into the horizontal joints. This allows the grout 3 to fill each angle of the horizontal joint more evenly and fully, thus ensuring that the grout 3 fills each corner between the wind turbine foundation 100 and the cushion layer 2 more evenly and fully, thereby making the wind turbine foundation 100 of the present invention more stable. Specifically, each prefabricated component 1 has grouting holes 14 penetrating its base plate 11, thereby allowing the grouting holes 14 to communicate with the horizontal joints. The number and position of the grouting holes 14 can be set as needed, so that the grout 3 can reach various positions of the horizontal joint through different grouting holes 14. Adjacent grouting holes 14 can cooperate with each other to reduce the occurrence of missing grout 3. Dividing joints 15 are defined between two adjacent prefabricated components 1. Grouting into the horizontal joint through the dividing joints 15 ensures that the horizontal joint adjacent to the dividing joints 15 is adequately grouted, thereby ensuring that the grout 3 in the horizontal joint is fully grouted.

[0047] Therefore, the wind power foundation horizontal joint grouting method according to the present invention has the advantages of easy grouting, full and uniform filling of grout 3 to make the wind power foundation 100 more stable.

[0048] like Figures 1 to 7 As shown, the prefabricated component 1 according to an embodiment of the present invention includes a base plate 11, a column 12, and a rib beam 13. The base plate 11 is disposed on the outer periphery of the column 12 and defines a stepped groove with the column 12. The rib beam 13 is disposed in the stepped groove and connected to the base plate 11 and the column 12. The base plate 11 has grouting holes 14, and the thickness direction of the base plate 11 is a first direction. The grouting holes 14 penetrate the base plate 11 along the first direction. The first direction can be a vertical direction, as shown by the arrows in the figure. For example, in an embodiment of the present invention, the axial direction of the wind power foundation 100 and the thickness direction of the base plate 11 are vertical directions. The grouting holes 14 penetrate the base plate 11 along the vertical direction.

[0049] like Figure 2 and Figure 3 As shown, in some embodiments, the cushion layer 2 has a downwardly concave hollow region 22, and the columns 12 of the assembled wind turbine foundation 100 can be located within the hollow region 22 of the cushion layer 2. Multiple spacers 21 are placed on the cushion layer 2 so that the base plate 11 of the wind turbine foundation 100, after pressing against the spacers 21, defines a horizontal joint with the cushion layer 2. For example, multiple spacers 21 are placed under each precast component 1.

[0050] The wind turbine foundation 100 is annular, and its axis is vertical. After the assembled wind turbine foundation 100 is placed on the pad layer 2, an annular horizontal joint is formed.

[0051] like Figure 4As shown, before grouting, sealing strips 53 are used to seal the inner and outer sides of the horizontal joint to prevent grout 3 from overflowing from both sides of the horizontal joint. Specifically, a first annular sealing strip 531 is used to seal the inner side of the horizontal joint (the annular gap between the wind turbine foundation 100 and the subbase 2), and a second annular sealing strip 532 is used to seal the outer side of the horizontal joint (the annular gap between the wind turbine foundation 100 and the subbase 2). This reduces the loss of grout 3 during grouting. For example, the sealing strip 53 is a rubber strip.

[0052] In some embodiments, grouting is performed into the grouting holes 14 in the precast component 1, followed by grouting into the joint 15. That is, grouting is first performed into the horizontal joint through the grouting holes 14 on the base plate 11 so that the grout 3 fills the area of ​​the horizontal joint away from the joint 15, and then grouting is performed into the horizontal joint through the joint 15 to fill the area of ​​the horizontal joint adjacent to the joint 15 so that the grout 3 fills the horizontal joint more fully.

[0053] like Figure 4 and Figure 5 As shown, in some embodiments, the horizontal joint is divided into multiple intermediate regions 41 that are circumferentially away from the corresponding joint 15 and multiple edge regions 42 that are circumferentially adjacent to the corresponding joint 15. Specifically, the surface (lower surface) of the base plate 11 facing away from the rib beam 13 in a first direction is divided into an intermediate portion 111 and two edge portions 112 in the circumferential direction of the pedestal 12 (wind power foundation 100). The intermediate portion 111 is located between the two edge portions 112 in the circumferential direction. The intermediate region 41 of the horizontal joint is defined between the intermediate portion 111 and the pad layer 2, and the edge regions 42 are defined with the pad layer 2 to define the edge regions 42 of the horizontal joint. That is, the intermediate portion 111 (intermediate region 41) is the region away from the joint 15 (circumferential side of the base plate 11), and the edge portion 112 (edge ​​region 42) is the region adjacent to the joint 15 (circumferential side of the base plate 11).

[0054] In some embodiments, the ratio of the total area of ​​the middle portion 111 (middle region 41) to the total area of ​​the edge portion 112 (edge ​​region 42) is (1-3):1. For example, the ratio of the total area of ​​the middle portion 111 (middle region 41) to the total area of ​​the edge portion 112 (edge ​​region 42) is 1:1.

[0055] In some embodiments, a plurality of radially extending first compartment strips 51 are placed between the wind turbine foundation 100 and the cushion layer 2, so that the first compartment strips 51 can divide the horizontal seam below the corresponding precast component 1 into a central region 41 and two edge regions 42. Specifically, the first compartment strips 51 can undergo elastic deformation. After placing a plurality of first compartment strips 51 at a predetermined position on the cushion layer 2, the wind turbine foundation 100 is placed on the cushion layer 2, so that the plurality of radially extending first compartment strips 51 are placed between the wind turbine foundation 100 and the cushion layer 2. Each base plate 11 has two spaced-apart first compartment strips 51 below it, so as to divide the horizontal seam below the corresponding precast component 1 into a central region 41 and two edge regions 42. For example, the pad block 21 is located within the edge region 42, and the two ends of the first compartment strip 51 are connected to the first sealing strip 531 and the second sealing strip 532, respectively.

[0056] After grouting the intermediate region 41 using the grouting holes 14, the edge region 42 is grouted using the dividing joints 15. The intermediate region 41 is defined by the first dividing strip 51. Filling the intermediate region 41 first facilitates the release of gas, and the volume of each intermediate region 41 is determined, allowing sufficient grout 3 to completely fill the intermediate region 41, ensuring the grout 3 within the intermediate region 41 is adequate and uniform. Then, the edge region 42 is filled using the dividing joints 15 to facilitate gas release.

[0057] like Figure 4 and Figure 5 As shown, in some embodiments, a plurality of annular second compartment strips 52 are placed between the wind turbine foundation 100 and the cushion layer 2, and are arranged to intersect each of the plurality of second compartment strips 52 and each of the plurality of first compartment strips 51, so that the second compartment strips 52 divide the intermediate region 41 into a plurality of intermediate sub-regions and the edge region 42 into a plurality of edge sub-regions. Specifically, each intermediate sub-region has a grouting hole 14 communicating with it. For example, the center position of the plurality of annular second compartment strips 52 is the same as the axis position of the wind turbine foundation 100.

[0058] After grouting each intermediate sub-region using grouting holes 14, grouting is performed on each edge sub-region using dividing joints 15. This allows for more thorough and uniform filling of the grout 3 within the horizontal joints.

[0059] Grouting is carried out sequentially from the inside out of multiple intermediate sub-regions, that is, the intermediate sub-regions on the inner side of the adjacent horizontal joints are grouted first.

[0060] Grouting is carried out sequentially from the inside out on multiple edge sub-regions, that is, the edge sub-regions on the inner side of the adjacent horizontal joint are grouted first.

[0061] like Figure 6As shown, in some embodiments, a plurality of vent holes 16 communicating with the middle region 41 of the horizontal seam are provided on the base plate 11 of each preform 1, and a plurality of first air-guiding grooves 17 facing the middle region 41 and communicating with the vent holes 16 are provided on the bottom surface of the base plate 11 of each preform 1, so that the gas in the slurry 3 in the middle region 41 can be discharged from the horizontal seam in sequence through the first air-guiding grooves 17 and the vent holes 16. That is, the middle part 111 is provided with vent holes 16 penetrating the base plate 11 and first air-guiding grooves 17 communicating with the vent holes 16.

[0062] Specifically, each intermediate sub-region has multiple vent holes 16. A first air-guiding groove 17 is formed on the bottom surface of the base plate 11 to facilitate gas flow within the intermediate region 41. During grouting, gas in each intermediate sub-region flows through the first air-guiding groove 17 into the vent holes 16 and then exits through the horizontal seam, resulting in more uniform grouting. Multiple first air-guiding grooves 17 can be arranged in a mesh structure so that gas can converge into the vent holes 16 from multiple locations. The vent holes 16 can be formed at the intersections of the first air-guiding grooves 17 for better venting.

[0063] Multiple second air-guiding grooves 18 are provided on the bottom surface of the base plate 11 of each precast component 1, facing the edge region 42 and communicating with the joint 15, so that the gas in the slurry 3 in the edge region 42 can be discharged from the horizontal joint through the second air-guiding grooves 18 and the joint 15 in sequence.

[0064] Specifically, a second air guide groove 18 is provided on the edge portion 112, and the second air guide groove 18 penetrates the base plate 11 on the circumferential upward side of the column 12. There are multiple second air guide grooves 18 so that gas from multiple locations can enter the slit 15 through the second air guide grooves 18 and exit the horizontal slit, so as to better exhaust gas.

[0065] For example, the first compartment strip 51 and the second compartment strip 52 are rubber strips. Two annular second compartment strips 52 are placed between the wind turbine foundation 100 and the cushion layer 2, intersecting with each of the plurality of second compartment strips 52 and each of the plurality of first compartment strips 51, so that the second compartment strips 52 divide the intermediate region 41 into a plurality of intermediate sub-regions and the edge region 42 into a plurality of edge sub-regions. Specifically, each base plate 11 has three intermediate sub-regions and six edge sub-regions below it. Grouting is performed on the three intermediate sub-regions first, followed by grouting on the six edge sub-regions.

[0066] In some embodiments, in a cross-section along the vertical and up-down directions, the projection of the first gas-guiding groove 17 is connected to each edge and / or each corner of the projection of the corresponding (located) intermediate sub-region, and the projection of the second gas-guiding groove 18 is connected to each edge and / or each corner of the projection of the corresponding (located) edge sub-region. This allows for better venting of gas within the intermediate and edge sub-regions. For example, in a cross-section along the vertical and up-down directions, the projection of the first gas-guiding groove 17 is connected to each corner of the projection of the corresponding intermediate sub-region, and the projection of the second gas-guiding groove 18 is connected to each corner of the projection of the corresponding edge sub-region.

[0067] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0071] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A method for grouting horizontal joints in wind turbine foundations, characterized in that, The wind power foundation is formed by sequentially connecting multiple prefabricated components along the circumference. Each prefabricated component has a grouting hole penetrating its base plate, and a joint is defined between two adjacent prefabricated components. The process includes the following steps: The assembled wind turbine foundation is placed on the cushion layer so that a horizontal joint is formed between the wind turbine foundation and the cushion layer; The horizontal seam is divided into multiple intermediate regions that are circumferentially away from the corresponding seam and multiple edge regions that are circumferentially adjacent to the corresponding seam. Grout is injected into the grouting holes within the precast component so that the grout fills the middle area of ​​the horizontal joint; Grout is injected into the joint so that the grout fills the edge area of ​​the horizontal joint; A plurality of vent holes communicating with the middle area of ​​the horizontal seam are provided on the bottom plate of each precast component, and a plurality of first air guide grooves facing the middle area and communicating with the vent holes are provided on the bottom surface of the bottom plate of each precast component, so that the gas in the slurry in the middle area can be discharged from the horizontal seam in sequence through the first air guide grooves and the vent holes. A plurality of second air-guiding grooves are provided on the bottom surface of the base plate of each precast component, facing the edge region and communicating with the joint, so that the gas in the slurry in the edge region can be discharged from the horizontal joint in sequence through the second air-guiding grooves and the joint; Multiple radially extending first compartment strips are placed between the wind turbine foundation and the cushion layer so that the first compartment strips can divide the horizontal seam below the corresponding precast component into a central region and two edge regions; After grouting the middle area using the grouting holes, the edge area is grouted using the joints.

2. The grouting method for horizontal joints in wind turbine foundations according to claim 1, characterized in that, Multiple annular second compartment strips are placed between the wind power foundation and the cushion layer and are arranged to intersect each of the multiple second compartment strips and each of the multiple first compartment strips, so that the second compartment strips divide the intermediate area into multiple intermediate sub-areas and the edge area into multiple edge sub-areas. After grouting each of the intermediate sub-regions using the grouting holes, grouting each of the edge sub-regions using the joints; Grouting is performed sequentially from the inside out on multiple intermediate sub-regions, and grouting is performed sequentially from the inside out on multiple edge sub-regions.

3. The grouting method for horizontal joints in wind turbine foundations according to claim 2, characterized in that, In the cross-section along the vertical and up-down directions, the projection of the first air guide groove is connected to each edge and / or each corner of the projection of the corresponding intermediate sub-region, and the projection of the second air guide groove is connected to each edge and / or each corner of the projection of the corresponding edge sub-region.

4. The grouting method for horizontal joints in wind turbine foundations according to claim 1, characterized in that, The wind turbine foundation is ring-shaped, and the axis of the wind turbine foundation is in the vertical direction; Before grouting, the inner and outer sides of the horizontal joint are sealed with sealing strips to prevent grout from overflowing from both sides of the horizontal joint.

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