Anti-cracking ground structure and construction method thereof

Abstract

The invention discloses an anti-cracking ground structure and a construction method thereof. The anti-cracking ground structure comprises an isolating membrane, a concrete layer and a slidable anchoring structure, wherein the isolating membrane and the concrete layer are sequentially laid on an original ground base layer, and the slidable anchoring structure is connected with the original ground base layer and the concrete layer. The slidable anchoring structure comprises a concave block, an isolation cover and an anchoring bolt; a containing groove is formed in the concave area of the concave block, and a sliding groove is formed in the bottom of the containing groove. The isolation cover is used for blocking the accommodating groove; the anchor bolt comprises a bolt body and a nut connected to the head of the bolt body, the bolt body penetrates through the sliding groove, the nut is located in the containing groove, and the anchor bolt can move along the sliding groove; a bolt body of the anchor bolt is fixed in the original ground base layer, the concave block is located on the isolating membrane, a nut presses the bottom face of the containing groove, and the concrete layer wraps the slidable anchor structure. And the concave block is configured in a way that the length direction of the sliding chute is consistent with the length direction of the construction area. According to the ground structure, the concrete layer can be prevented from warping, and the cracking risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ground structures, and particularly relates to a crack-proof ground structure and a construction method thereof. Background Art

[0002] When an old concrete ground is severely damaged, a repair method that can be adopted is to re-pour a new concrete layer on the surface of the old concrete ground. Chinese Patent with Publication No. CN220705022U discloses an integrally formed crack-resistant non-bonding wear-resistant floor, which is essentially a repaired ground structure. This integrally formed crack-resistant non-bonding wear-resistant floor includes a separation film, a steel fiber concrete layer, a wear-resistant aggregate layer, and a hardening layer that are sequentially laid on the original ground base; the above-mentioned wear-resistant aggregate layer is integrally connected and fused with the top layer of the above-mentioned steel fiber concrete layer; several anchor bolts with arc-shaped or curved connectors at the top are arranged in the above-mentioned original ground base, the above-mentioned separation film, and the above-mentioned steel fiber concrete layer, and the above-mentioned anchor bolts pass through the above-mentioned separation film and are fixed on the above-mentioned original ground base, and the above-mentioned connectors are located in the above-mentioned steel fiber concrete layer.

[0003] The above ground structure can often only be applied to small areas. When the ground area is large, especially when the aspect ratio of length to width is large, there are the following risks: with the changes in temperature, load, and the early shrinkage and expansion inherent in the concrete slurry itself, the original ground base and the concrete layer on the original ground base may both shrink or expand in the length direction, thereby generating tensile stress on the anchor bolts, and the stress concentration at the anchor bolt fixing points is prone to cracking. Summary of the Invention

[0004] To solve the technical problems mentioned in the background art, the present invention provides a crack-proof ground structure and a construction method thereof. In the ground structure of the present invention, a slidable anchoring structure is used to replace the anchor bolts in the existing ground structure, which can avoid the cracking risk caused by stress concentration at the anchor bolts, and the cracking risk of the ground structure is reduced.

[0005] On the one hand, the present invention provides a crack-proof ground structure, including: a separation film, a concrete layer, and a slidable anchoring structure that connects the original ground base and the concrete layer, which are sequentially laid on the original ground base; the slidable anchoring structure includes a concave block, a separation cover, and an anchoring bolt; a receiving groove is formed in the concave region of the concave block, and a through groove is provided at the bottom of the receiving groove; the separation cover is used to block the mouth of the receiving groove; the anchoring bolt includes a bolt body and a nut connected to the head of the bolt body, the bolt body passes through the through groove, the nut is located in the receiving groove, and the anchoring bolt can move along the through groove; Among them, the bolt body of the anchor bolt is fixedly connected to the original ground base layer, the concave block is located on the isolation film, the nut presses against the bottom surface of the accommodation groove, and the concrete layer embeds the slidable anchoring structure; and the concave block in the slidable anchoring structure is configured such that the length direction of its chute is consistent with the length direction of the construction area. In the present invention, the concave block of the slidable anchoring structure is configured such that the length direction of its chute is consistent with the length direction of the construction area, so that the relative sliding direction between the anchor bolt and the concave block can be restricted to be along the length direction of the construction area. In this way, when the original ground base layer or the concrete layer shrinks or expands in the length direction, it causes relative movement between the concave block and the anchor bolt in the length direction, thereby avoiding stress concentration at the connection of the anchor bolt, and thus reducing the cracking risk of the ground structure.

[0006] In some specific embodiments, the upper surface of the concrete layer exceeds the upper surface of the slidable anchoring structure by 5 mm - 10 mm.

[0007] In some specific embodiments, the bolt body is installed at the center of the chute.

[0008] In some specific embodiments, the layout of the slidable anchoring structure in the construction area is: a plurality of slidable anchoring structures are arranged along the width direction of the construction area near the two short-end boundaries of the construction area.

[0009] Furthermore, the vicinity of the short-end boundary of the construction area refers to the area 10 cm - 20 cm inside the short-end boundary.

[0010] Furthermore, for a construction area with a large aspect ratio of length to width, it further includes: a plurality of slidable anchoring structures are arranged along one or more dividing lines of the construction area, and the dividing lines refer to the dividing lines parallel to the width direction of the construction area, and the dividing lines can be bisecting lines, trisecting lines, or quadrisection lines.

[0011] In the slidable anchoring structure of the anti-cracking ground structure of the present invention, the aspect ratio of the length to the width of the chute in the concave block is preferably 2 - 2.5:1. In the materials of this application, the aspect ratio of the chute refers to the ratio of the projected length in the length direction to the projected length in the width direction of the chute.

[0012] In some specific embodiments, the projected length of the chute in the width direction is 10 mm, and the projected length in the length direction is 20 mm - 25 mm.

[0013] In some specific embodiments, the chute is in an oval shape, a rectangular shape, or a racetrack shape. It should be noted that the chute being in an oval shape, a rectangular shape, or a racetrack shape means that the projection of the chute on the bottom surface of the accommodation groove is in an oval shape, a rectangular shape, or a racetrack shape.

[0014] When the sliding groove is oval, the projected lengths of the sliding groove in the length direction and the width direction are respectively equal to the major axis and the minor axis of the oval, and the aspect ratio of the length to the width of the sliding groove is equal to the ratio of the major axis to the minor axis of the oval; when the sliding groove is rectangular, the projected lengths of the sliding groove in the length direction and the width direction are respectively equal to the length and the width of the rectangle, and the aspect ratio of the length to the width of the sliding groove is equal to the ratio of the length to the width of the rectangle.

[0015] The runway shape is a figure composed of a rectangle with a semicircle connected to each end. When the sliding groove is in the shape of a runway, the projected length of the sliding groove in the length direction is equal to the sum of the length of the rectangle and the radius of the semicircle, and the projected length of the sliding groove in the width direction is equal to the width of the rectangle, that is, the diameter of the semicircle.

[0016] To more intuitively understand the structure of the concave block in the present application, a photo of the concave block is provided, as shown in Figure 5 , Figure 5 In the figure, the sliding groove at the bottom of the concave block is in the shape of a runway. Of course, the concave block of the present application is not limited to Figure 5 the structure shown.

[0017] In some specific embodiments, the receiving groove is cylindrical, such as cylindrical or cuboid, preferably cylindrical.

[0018] The present invention does not limit the structure of the isolation cover, as long as it can block the opening of the receiving groove and prevent the concrete slurry from entering the receiving groove.

[0019] Furthermore, the above-mentioned slidable anchoring structure further includes a gasket, which is provided with a first positioning hole. The gasket is placed on the sliding groove and its first positioning hole corresponds to the sliding groove; the bolt body sequentially passes through the first positioning hole and the sliding groove on the gasket, and the nut is pressed against the gasket. In some specific embodiments, the gasket is made of metal, preferably a rust-resistant metal material, such as stainless steel.

[0020] In the slidable anchoring structure, the main functions of the gasket are: (1) preventing the nut from falling into the sliding groove; (2) expanding the contact area between the nut and the bottom surface of the receiving groove, so that the nut can firmly press the concave block.

[0021] Furthermore, the above-mentioned slidable anchoring structure further includes a sealing gasket, which is provided with a second positioning hole, and the diameter of the second positioning hole is not less than the projected length of the sliding groove in the length direction; the sealing gasket is arranged on the bottom surface of the concave block and the second positioning hole corresponds to the sliding groove.

[0022] In the above-mentioned slidable anchoring structure, since the concave block and the anchoring bolt need to be in the concrete for a long time, the materials of the concave block and the anchoring bolt should be selected as rust-resistant materials, preferably rust-resistant metal materials, such as stainless steel; the material of the isolation cover is preferably an elastic material with good sealing performance and convenient installation, such as rubber.

[0023] On the other hand, the present invention provides a construction method of the above-mentioned crack-resistant ground structure, including the steps: (1) Drill holes at the original ground base layer in the construction area and drill holes, and fully lay an isolation film on the surface of the original ground base layer; the layout of the drill holes is consistent with the layout of the slidable anchoring structure in the construction area; (2) Install the slidable anchoring structure into the drill holes, and adjust the slidable anchoring structure so that: the length direction of the chute of the concave block is consistent with the length direction of the construction area, and the screw body is installed at the center of the chute; (3) Pour concrete slurry on the surface of the original ground base layer and completely embed the slidable anchoring structure.

[0024] In some specific embodiments, step (2) is specifically: insert the screw body into the drill hole; adjust the slidable anchoring structure so that: the length direction of the chute of the concave block is consistent with the length direction of the construction area, and the screw body is installed at the center of the chute; use a wrench to rotate the nut to press the concave block against the original ground base layer, and cover the isolation cover.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects: The crack-resistant ground structure of the present invention is easy to construct. It uses a slidable anchoring structure to replace the anchor nails in the existing ground structure. While avoiding the warping of the concrete layer in the ground structure, its crack resistance is enhanced, especially suitable for large-area ground areas, especially those with a large aspect ratio of length to width. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a side sectional view of the slidable anchoring structure in the embodiment; Figure 2 It is a cross-sectional view of the slidable anchoring structure in the embodiment; Figure 3 It is a schematic construction process diagram of the crack-resistant ground structure in the embodiment; Figure 4 It is a schematic distribution diagram of the slidable anchoring structure in the construction area in the embodiment; Figure 5 It is a photo of a concave block.

[0028] Reference numerals: Slidable anchoring structure 100, concave block 110, receiving groove 111, sliding groove 112, isolation cover 120, cover body 121, annular wall 122, anchoring bolt 130, nut 131, screw rod 132, sleeve 133, bottom bolt 134, gasket 140, sealing gasket 150, construction area 200. Detailed implementation manners

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Compared with the ground structure mentioned in the background art, the anti-cracking ground structure of the present invention uses a slidable anchoring structure to replace the anchor pins in the existing ground structure. This slidable anchoring structure can avoid the cracking risk caused by stress concentration at the anchor pins. The following Embodiments 1-4 will respectively provide several specific implementation manners of the slidable anchoring structure. Embodiment

[0031] In this embodiment, the slidable anchoring structure, its structure is shown in Figure 1-2 , and includes a concave block 110, an isolation cover 120 and an anchoring bolt 130; the recessed area of the concave block 110 forms a receiving groove 111, and a sliding groove 112 penetrating the bottom of the concave block 110 is provided at the bottom of the receiving groove 111; the isolation cover 120 is used to block the notch of the receiving groove 111; the anchoring bolt 130 includes a bolt body and a nut 131 connected to the head of the bolt body; the installation method of the anchoring bolt 130 is: passing the bolt body through the sliding groove 112, the nut 131 is located in the receiving groove 111, and the anchoring bolt 130 can move along the sliding groove 112.

[0032] The concave block 110 is used to bond with concrete, and the material is selected as stainless steel. The appearance of the concave block 110 is cylindrical, with a height of 10 mm and a bottom diameter of 50 mm. The receiving groove 111 carried by the concave block 110 is also cylindrical, with a groove depth of 8 mm and a bottom diameter of 40 mm. The sliding groove 112 is elliptical, with a major axis of 20 mm and a minor axis of 8 mm.

[0033] The isolation cover 120 is made of rubber with good sealing performance and convenient installation. It has an inverted concave structure adapted to the receiving groove 111, including a cover body 121 adapted to the opening of the receiving groove 111 and an annular wall 122 adapted to the side wall of the receiving groove 111. The annular wall 122 is arranged along the edge of the cover body 121. When in use, the annular wall 122 is placed in the receiving groove 111 and fits with the side wall of the receiving groove 111, and the cover body 121 seals the opening of the receiving groove 111, thereby isolating the receiving groove 111 from the outside and preventing the concrete slurry from entering the receiving groove 111. In this embodiment, the thicknesses of both the cover body 121 and the annular wall 122 of the isolation cover 120 are 2 mm.

[0034] The anchoring bolt 130 is also used to connect with the concrete, and the material is selected as stainless steel. Its bolt body penetrates through the sliding groove 112, and the nut 131 remains in the receiving groove 111. In this embodiment, the anchoring bolt 130 is an expansion bolt, and its bolt body includes a screw rod 132, an expansion tube 133 and a bottom bolt 134. The screw rod 132 is 12 cm long and 6 mm in diameter. The expansion tube 133 is sleeved outside the screw rod 132, and the bottom bolt 134 is connected to the bottom end of the screw rod 132. The nut 131 is a hexagonal nut, with a distance between opposite sides of 10 mm and a thickness of 3 mm.

[0035] In the slidable anchoring structure, the anchoring bolt 130 and the concave block 110 can slide relative to each other. The sliding groove 112 is used to guide the sliding of the anchoring bolt 130. In the materials of this application, the sliding direction of the anchoring bolt 130 relative to the concave block 110 is the length direction of the sliding groove 112. The nut 131 is located in the receiving groove 111 and presses on the sliding groove 112. The size of the nut 131 ensures that it will not enter the sliding groove 112. The receiving groove 111 is used to accommodate the nut 131 and provide space for the sliding of the nut 131. The isolation cover 120 is used to seal the opening of the receiving groove 111 to prevent the concrete slurry from entering the receiving groove 111, thus affecting the relative sliding between the anchoring bolt 130 and the concave block 110. Embodiment

[0036] In this embodiment, the difference between the slidable anchoring structure and Embodiment 1 lies only in the size of the concave block 110 and the structure and size of the sliding groove 112. In this embodiment, the appearance of the concave block 110 is also cylindrical, with a height of 15 mm and a bottom diameter of 50 mm. The receiving groove 111 carried by the concave block 110 is also cylindrical, with a groove depth of 8 mm and a bottom diameter of 40 mm. The sliding groove 112 is rectangular, with a length of 16 mm and a width of 8 mm. Embodiment

[0037] In this embodiment, compared with the slidable anchoring structure in Embodiment 1, it further includes a gasket 140. The gasket 140 is provided with a first positioning hole. The gasket 140 is placed on the bottom surface of the receiving groove 111 and the first positioning hole corresponds to the sliding groove 112. When installing the anchoring bolt 130, the bolt body sequentially passes through the first positioning hole on the gasket 140 and the sliding groove 112, and the nut 131 presses on the gasket 140. In this embodiment, the gasket 140 has a thickness of 1.5 mm, an outer diameter of 18 mm, the aperture of the first positioning hole is 8 mm, and the material of the gasket 140 is stainless steel. Embodiment

[0038] In this embodiment, compared with the slidable anchoring structure in Embodiment 1, it further includes a sealing gasket 150. The sealing gasket 150 is provided with a second positioning hole 151. The sealing gasket 150 is bonded to the bottom end of the concave block 110, and the second positioning hole 151 corresponds to the sliding groove 112. When installing the anchoring bolt 130, the bolt body sequentially passes through the first positioning hole on the gasket 140, the sliding groove 112, and the second positioning hole 151 on the sealing gasket 150, and the nut 131 presses on the gasket 140. In this embodiment, the sealing gasket 150 has a thickness of 2 mm, an outer diameter of 50 mm, the aperture of the second positioning hole 151 is 45 mm, and the material of the sealing gasket 150 is rubber.

[0039] In this embodiment, the sealing gasket 150 has a thickness of 2 mm, an outer diameter of 50 mm, the aperture of the second positioning hole 151 is 45 mm, and the material of the sealing gasket 150 is rubber. The upper surface of the sealing gasket 150 is adhesively bonded to the bottom end of the concave block 110, and its lower surface is adhesively bonded to the ground, which can form a seal around the concave block 110 to prevent the concrete slurry from entering the bottom end of the concave block 110, and further prevent the concrete slurry from entering the receiving groove 111 from below the sliding groove 112. Embodiment

[0040] This embodiment provides a crack-resistant ground structure, including an isolation film, a concrete layer, and a slidable anchoring structure connecting the original ground base layer and the concrete layer, which are sequentially laid on the original ground base layer; the slidable anchoring structure is the slidable anchoring structure in Embodiment 3; the concrete layer embeds the slidable anchoring structure; in the slidable anchoring structure, the bolt body of the anchoring bolt 130 is fixedly connected to the original ground base layer, the concave block 110 is located on the isolation film, and the nut 131 is located at the bottom of the receiving groove 111 and presses on the gasket 140; the concave block 110 is configured such that the length direction of its sliding groove is consistent with the length direction of the construction area.

[0041] In this embodiment, the construction steps of the crack-resistant ground structure can be referred to Figure 3 , including: Drill holes at the original ground base layer in the construction area and drill the holes. Lay a full-width isolation film on the surface of the original ground base layer. The drilled holes are used to install the slidable anchoring structure. Therefore, the layout of the drill holes should be consistent with the layout of the slidable anchoring structure in the construction area, and the drill hole size should be consistent with the size of the anchoring bolt 130 in the slidable anchoring structure. In this embodiment, a drill bit with a diameter of 8 mm and a length of 12 cm is used for drilling. Please refer to Figure 4 , which shows the distribution schematic diagram of the slidable anchoring structure in the construction area in this embodiment. The distribution of the slidable anchoring structure is as follows: A plurality of slidable anchoring structures 100 are arranged at equal intervals along the width direction of the construction area 200 near the two short-end boundaries of the construction area 200, and a plurality of slidable anchoring structures 100 are arranged at equal intervals on the bisector of the construction area 200, and the interval is set to 30 cm. In this embodiment, the vicinity of the short-end boundary of the construction area 200 refers to the place 20 cm away from the short-end boundary.

[0042] Install the slidable anchoring structure 100 into the drill holes. In this embodiment, the installation of the slidable anchoring structure 100 is specifically as follows: Insert the screw body that sequentially passes through the gasket 140 and the chute 112 into the drill hole. Adjust the slidable anchoring structure so that the length direction of the chute 112 of the concave block 110 is consistent with the length direction of the construction area, and the screw body is installed at the center of the chute 112. Use a wrench to rotate the nut 131 in the receiving groove 111 to press the concave block 110 against the original ground base layer, and cover the isolation cover 120.

[0043] Pour concrete slurry on the surface of the original ground base layer and completely embed the slidable anchoring structure.

[0044] Finally, a concrete layer with a thickness of 15 mm is obtained, and the upper surface of the concrete layer exceeds the upper surface of the slidable anchoring structure 100 by about 5 mm.

[0045] In the crack-resistant ground structure, the concave block of the slidable anchoring structure is bonded to the upper concrete layer, and the bolt body of the anchoring bolt is fixedly connected to the original ground base layer. Due to the restrictive effects of the concave block and the anchoring bolt, the concrete layer can be prevented from warping. At the same time, because the anchoring bolt and the concave block can slide relative to each other along the length direction of the construction area, when the original ground base layer or the concrete layer shrinks or expands in the length direction, it causes relative movement between the concave block and the anchoring bolt in the length direction, which can avoid stress concentration at the anchoring bolt, and thus can avoid the cracking risk caused by stress concentration. Note that the above is only a preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of this application. Therefore, although this application has been described in more detail through the above embodiments, this application is not limited to the above embodiments. Without departing from the concept of this application, more other equivalent embodiments can also be included, all of which fall within the protection scope of the present invention.

Claims

1. A crack - resistant ground structure, characterized in that: It includes an isolation film, a concrete layer, and a slidable anchoring structure that connects the original ground base layer and the concrete layer, which are sequentially laid on the original ground base layer; The slidable anchoring structure includes a concave block, an isolation cover, and an anchoring bolt; a receiving groove is formed in the concave area of the concave block, and a sliding groove penetrating the bottom is provided at the bottom of the receiving groove; the isolation cover is used to block the notch of the receiving groove; the anchoring bolt includes a bolt body and a nut connected to the head of the bolt body, the bolt body passes through the sliding groove, the nut is located in the receiving groove, and the anchoring bolt can move along the sliding groove; Among them, the bolt body of the anchoring bolt is fixedly connected to the original ground base layer, the concave block is located on the isolation film, the nut presses against the bottom surface of the receiving groove, and the concrete layer embeds the slidable anchoring structure; and the concave block in the slidable anchoring structure is configured such that the length direction of its sliding groove is consistent with the length direction of the construction area.

2. The crack - resistant ground structure according to claim 1, characterized in that: The upper surface of the concrete layer exceeds the upper surface of the slidable anchoring structure by 5 mm - 10 mm.

3. The crack - resistant ground structure according to claim 1, characterized in that: The layout of the slidable anchoring structure in the construction area is: a plurality of slidable anchoring structures are respectively arranged along the width direction of the construction area near the two short - end boundaries of the construction area.

4. The crack - resistant ground structure according to claim 3, characterized in that: It further includes: A plurality of slidable anchoring structures are arranged along one or more equal - division lines of the construction area, and the equal - division lines refer to the equal - division lines parallel to the width direction of the construction area.

5. The crack - resistant ground structure according to claim 1, characterized in that: The aspect ratio of the length to the width of the sliding groove is 2 - 2.5:

1.

6. The crack - resistant ground structure according to claim 5, characterized in that: The sliding groove is elliptical, rectangular, or racetrack - shaped.

7. The crack - resistant ground structure according to claim 1, characterized in that: The slidable anchoring structure further includes a gasket, which is provided with a first positioning hole; the gasket is placed on the sliding groove, and when installing the anchoring bolt, the bolt body sequentially passes through the first positioning hole on the gasket and the sliding groove.

8. The crack - resistant ground structure according to claim 1, characterized in that: The slidable anchoring structure further includes a sealing gasket, which is provided with a second positioning hole, and the aperture of the second positioning hole is not less than the projection length of the sliding groove in the length direction; the sealing gasket is arranged on the bottom surface of the concave block and the second positioning hole corresponds to the sliding groove.

9. The construction method of the crack-resistant ground structure according to any one of claims 1-8, characterized in that, It includes: (1) Drill holes at the drilling points arranged on the original ground base layer in the construction area and drill holes, and fully lay an isolation film on the surface of the original ground base layer; The layout of the drilling points is consistent with the layout of the slidable anchoring structure in the construction area; (2) Install the slidable anchoring structure in the drilled holes, and adjust the slidable anchoring structure so that: the length direction of the sliding groove of the concave block is consistent with the length direction of the construction area, and the screw body is installed at the center of the sliding groove; (3) Pour concrete slurry on the surface of the original ground base layer and completely embed the slidable anchoring structure.

10. The construction method according to claim 9, characterized in that: Step (2) is specifically as follows: Insert the screw body into the drill hole; Adjust the slidable anchoring structure so that the length direction of the chute of the concave block is consistent with the length direction of the construction area, and the screw body is installed at the center of the chute; Use a wrench to rotate the nut to press the concave block against the original ground base layer, and cover the isolation cover.

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