Anti-seepage formwork structure for unbonded prestressed anti-floating anchor rod

Abstract

The invention relates to the technical field of constructional engineering, and discloses an anti-seepage formwork structure for an unbonded prestressed anti-floating anchor rod, the anti-seepage formwork structure comprises a water stop steel pipe and a PVC sleeve, the water stop steel pipe is used for being arranged at the top end of an anchor bearing plate and is used for being arranged outside the top of the anchor rod in a sleeving manner; the PVC sleeve is detachably connected to the top end of the water stop steel pipe and used for being arranged outside the top of the anchor rod in a sleeving mode, the PVC sleeve comprises a first semicircular part and a second semicircular part which are arranged in a split mode, and the first semicircular part and the second semicircular part are symmetrically arranged in the radial direction of the PVC sleeve and connected through a locking assembly. And therefore, the damage to the foundation when the underground water level rises too much is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to an anti-seepage formwork structure for non-bonded prestressed anti-floating anchor rods. Background Art

[0002] With the acceleration of urbanization, the development and utilization of underground space is increasing, especially in the construction of high-rise buildings and large-scale infrastructure. As an important foundation reinforcement and anti-floating structure, the application of unbonded prestressed anti-floating anchor rods is becoming more and more extensive. During the anchor rod construction process, after completing the installation and grouting of the anchor rod, it is necessary to install a formwork system on the top of the anchor rod to support and fix the pouring shape of the concrete, so that the anchor rod and the foundation slab form a whole, thereby transferring the prestress to the foundation structure.

[0003] Traditional conventional formwork systems are mostly wooden formwork or PVC sleeve formwork. Groundwater can easily seep up along the gaps, and the waterproof effect is poor. When the groundwater level rises a lot, it causes leakage, which causes serious damage to the foundation. Summary of the invention

[0004] In view of this, the present invention provides an anti-seepage formwork structure for non-bonded prestressed anti-floating anchor rods to solve the problem that the existing formwork system used for non-bonded prestressed anti-floating anchor rods has poor waterproof effect and is prone to cause great harm to the foundation when the groundwater level rises significantly.

[0005] The present invention provides an anti-seepage formwork structure for a non-bonded prestressed anti-floating anchor rod, comprising:

[0006] A water-stop steel pipe is used to be arranged on the top of the anchor pad and to be sleeved outside the top of the anchor rod;

[0007] The PVC sleeve is detachably connected to the top of the water-stop steel pipe and is used to be sleeved over the top of the anchor rod. The PVC sleeve includes a first semicircular portion and a second semicircular portion that are separately arranged. The first semicircular portion and the second semicircular portion are symmetrically arranged along the radial direction of the PVC sleeve and are connected by a locking assembly.

[0008] The anti-seepage formwork structure for the non-bonded prestressed anti-floating anchor according to the present invention has at least the following beneficial effects:

[0009] By arranging a waterstop steel pipe between the anchor plate and the PVC sleeve, when the groundwater level rises, the water penetrates upward along the anchor hole until it contacts the waterstop steel pipe and cannot continue to penetrate, thereby cutting off the water penetration path, thereby greatly enhancing the waterproof effect of the formwork method of the anti-seepage formwork structure, thereby reducing the damage to the foundation when the groundwater level rises a lot; at the same time, by detachably connecting the PVC sleeve and the waterstop steel pipe, and dividing the PVC sleeve into a first semicircular part and a second semicircular part, after the formwork is supported and the concrete pouring is completed, the PVC sleeve can be removed and reused, which not only saves construction costs but also conforms to the construction concept of green construction sites.

[0010] In an optional embodiment, a water stop ring is provided on the inner wall of the water stop steel pipe, and the water stop ring is arranged at one end of the water stop steel pipe relatively close to the PVC sleeve.

[0011] In an optional embodiment, the water stop ring extends from the outside to the inside along the radial direction of the water stop steel pipe, and the water stop ring is gradually inclined downward.

[0012] In an optional embodiment, the PVC sleeve is coaxially arranged with the water-stop steel pipe; a connecting piece is provided at the top end of the water-stop steel pipe, and the PVC sleeve is sleeved outside the connecting piece and has an interference fit with the connecting piece.

[0013] In an optional embodiment, the outer diameter of the connecting piece is smaller than the outer diameter of the water-stop steel pipe.

[0014] In an optional implementation, the outer diameter of the water-stop steel pipe is equal to the outer diameter of the PVC sleeve.

[0015] In an optional embodiment, the connecting member includes a plurality of buckles arranged at intervals along the circumferential direction.

[0016] In an optional embodiment, the locking assembly includes:

[0017] A first inserting portion, disposed on an end surface of the first semicircular portion facing the second semicircular portion;

[0018] A first slot is provided on an end surface of the second semicircular portion facing the first semicircular portion, and the first slot matches the first inserting portion.

[0019] In an optional embodiment, the number of the first slots is at least equal to the number of the first inserting parts, and a plurality of the first inserting parts are provided, and the plurality of first inserting parts are axially spaced apart from each other on the first semicircular part.

[0020] In an optional embodiment, the first slot is configured to be conical, and a size of the first slot gradually decreases in a direction away from the first semicircular portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of an anti-seepage formwork structure for a non-bonded prestressed anti-floating anchor rod assembled on the anchor rod according to an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of the top view of the water-stop steel pipe in an embodiment of the present invention;

[0024] Figure 3 for Figure 2 A schematic diagram of a main structure in cross-section;

[0025] Figure 4 It is a schematic diagram of the exploded structure of the PVC sleeve in an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 100-waterstop steel pipe, 110-waterstop ring, 120-connecting piece, 121-snap buckle;

[0028] 210-anchor plate, 220-anchor rod, 230-anchor;

[0029] 300-PVC sleeve, 310-first semicircular portion, 311-first plug portion, 320-second semicircular portion, 321-first slot. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] In the description of this embodiment, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting this embodiment. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] In the description of this embodiment, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0033] In the construction of high-rise buildings and large-scale infrastructure, in order to avoid damage to the building structure caused by the buoyancy of groundwater, a non-bonded prestressed anti-floating anchor rod 220 is usually used to anchor and connect with the steel bars of the foundation bottom plate, and the friction between the anchor body steel bars of the anti-floating anchor rod 220 and the soil layer around the grouting body is used to resist the buoyancy; during the construction of the anchor rod 220, after completing the installation of the anchor rod 220 in the drilling hole, grouting and other processes, it is necessary to install a formwork system on the top of the anchor rod 220 to support and fix the pouring shape of the concrete, so that the anchor rod 220 and the foundation bottom plate form a whole, thereby transferring the prestress to the foundation structure. Most of the conventional formwork systems in the related art are wooden formwork or PVC sleeve 300 formwork. Groundwater can easily seep up along the gaps, and the waterproof effect is poor. When the groundwater level rises more, leakage occurs, which causes serious damage to the foundation. In order to solve the above technical defects, an anti-seepage formwork structure for a non-bonded prestressed anti-floating anchor rod according to an embodiment of the present invention is provided.

[0034] Combine the following Figures 1 to 4 , describing an embodiment of the present invention.

[0035] According to an embodiment of the present invention, a water-proof formwork structure for a non-bonded prestressed anti-floating anchor is provided, comprising a water-stop steel pipe 100 and a PVC sleeve 300, wherein the water-stop steel pipe 100 is used to be arranged at the top end of an anchor pad 210, and is used to be sleeved outside the top of an anchor 220; the PVC sleeve 300 is detachably connected to the top end of the water-stop steel pipe 100, and is used to be sleeved outside the top of the anchor 220, and the PVC sleeve 300 comprises a first semicircular portion 310 and a second semicircular portion 320 which are separately arranged, and the first semicircular portion 310 and the second semicircular portion 320 are symmetrically arranged along the radial direction of the PVC sleeve 300, and are connected by a locking assembly.

[0036] The anti-seepage formwork structure of the present embodiment is provided with a water-stop steel pipe 100 between the anchor plate 210 and the PVC sleeve 300. When the groundwater level rises, the water penetrates upward along the anchor hole until it contacts the water-stop steel pipe 100 and cannot continue to penetrate, thereby cutting off the water penetration path. This greatly enhances the waterproof effect of the formwork method of the anti-seepage formwork structure of the present embodiment, thereby reducing the damage to the foundation when the groundwater level rises significantly. At the same time, the PVC sleeve 300 is detachably connected to the water-stop steel pipe 100, and the PVC sleeve 300 is divided into a first semicircular portion 310 and a second semicircular portion 320. After the formwork is supported and the concrete pouring is completed, the PVC sleeve 300 can be dismantled and reused, which not only saves construction costs but also complies with the construction concept of green construction sites.

[0037] It should be noted that during the construction of the anchor rod 220, when the anchor rod 220 is installed in the drilled hole (also called the anchor hole) and grouting is performed, quality problems such as drilling gaps are easily generated between the root of the anti-floating anchor rod 220 and the surrounding wall of the drilled hole due to the loose vibration. Therefore, when the groundwater level rises, the groundwater will penetrate upward along the anchor hole and cause water seepage in the foundation slab (specifically, the raft slab).

[0038] It should be noted that after the installation of the anti-seepage formwork structure of this embodiment is completed and concrete is poured into the water-stop steel pipe 100 and the PVC sleeve 300 and solidified, the locking assembly can be unlocked so that the first semicircular part 310 and the second semicircular part 320 can be disassembled and removed separately, thereby facilitating the dismantling and reuse of the PVC sleeve 300.

[0039] It should be noted that because the water-stop steel pipe 100 and the PVC sleeve 300 are both made of standardized materials, they are quick to install and remove, have high construction efficiency, and low labor intensity; and operators do not need too high professional skills, are easy to use, and have strong guidance and operability.

[0040] It should be noted that the water-stop steel pipe 100 and the PVC sleeve 300 are two separate components, and as modular size parts, they are convenient for batch modular customization in the processing plant and then transported to the construction site for assembly, thus shortening the construction period.

[0041] It is understandable that after completing the installation, grouting and other processes of the anchor rod 220, an anchor plate 210 is set on the top of the anchor rod 220. During the installation of the water-stop steel pipe 100, the water-stop steel pipe 100 is first erected on the top of the anchor plate 210, and the steel strand is tensioned and then locked with the anchor 230. The anchor 230 is connected to the multiple anchor rods 220 extending to the part outside the top of the anchor plate 210.

[0042] like Figure 1 and Figure 3 As shown, in some embodiments, a water stop ring 110 is provided around the inner wall of the water stop steel pipe 100, and the water stop ring 110 is provided at one end of the water stop steel pipe 100 relatively close to the PVC sleeve 300. When groundwater seeps upward along the inner wall of the water stop steel pipe 100, the flow direction of the water will change after the water contacts the connection between the water stop steel pipe 100 and the water stop ring 110, and the water moves radially inward along the water stop ring 110, thereby extending the water seepage path, effectively intercepting the upward seepage of groundwater, and achieving a better waterproof effect.

[0043] Specifically, the water stop ring 110 extends from outside to inside along the radial direction of the water stop steel pipe 100, and the water stop ring 110 is gradually tilted downward. By tilting the water stop ring 110 gradually downward inward, it is beneficial to extend the seepage movement path of groundwater on the one hand, and guide the groundwater to flow downward on the other hand, which is beneficial to intercept the upward infiltration of groundwater. More specifically, the angle formed between the water stop ring 110 and the horizontal plane is set to 15° to 20°, which does not affect the pouring of concrete to fully fill the water stop steel pipe 100, and can improve the extension of the seepage movement path of groundwater.

[0044] Specifically, the water stop ring 110 and the water stop steel pipe 100 are integrally formed, and are easy to process.

[0045] Specifically, the water stop ring 110 is coaxially arranged at the top of the water stop steel pipe 100, and a horizontal portion is arranged at one end of the water stop ring 110 radially outward of the water stop steel pipe 100, and the projection of the water stop steel pipe 100 along the axial direction of the water stop steel pipe 100 falls within the horizontal portion.

[0046] like Figures 1 to 3As shown, in some embodiments, the PVC sleeve 300 is coaxially arranged with the water-stop steel pipe 100; the top end of the water-stop steel pipe 100 is provided with a connector 120, and the PVC sleeve 300 is sleeved outside the connector 120 and has an interference fit with the connector 120. Because the first semicircular portion 310 and the second semicircular portion 320 form a whole through the locking assembly, and the PVC sleeve 300 is detachably connected to the connector 120 in an interference fit manner, on the one hand, by abutting and locking the first semicircular portion 310 and the second semicircular portion 320 against each other, the PVC sleeve 300 and the water-stop steel pipe 100 are assembled into one body to provide a stable and firm formwork; on the other hand, after the formwork is supported and the concrete is poured, the locking assembly is unlocked and the first semicircular portion 310 and the second semicircular portion 320 are moved away from each other along the radial direction of the PVC sleeve 300, so that the PVC sleeve 300 can be removed and reused, and the entire disassembly and assembly process is easy to operate.

[0047] like Figure 1 As shown, specifically, the outer diameter of the connecting piece 120 is smaller than the outer diameter of the waterstop steel pipe 100, so that the axial projection of the PVC sleeve 300 at least partially overlaps with the waterstop steel pipe 100, effectively avoiding the axial displacement of the PVC sleeve 300 relative to the waterstop steel pipe 100 during the process of pouring concrete to fully fill the interior of the waterstop steel pipe 100 and the PVC sleeve 300, thereby ensuring the provision of a stable and firm formwork.

[0048] Specifically, the outer diameter of the waterstop steel pipe 100 is equal to the outer diameter of the PVC sleeve 300; so that the projection of the PVC sleeve 300 along the axial direction of the PVC sleeve 300 all falls within the range of the waterstop steel pipe 100, which is more conducive to avoiding the PVC sleeve 300 from being offset relative to the waterstop steel pipe 100 during the process of pouring concrete to fully fill the waterstop steel pipe 100 and the PVC sleeve 300, thereby ensuring the provision of stable and firm formwork.

[0049] like Figure 2 As shown, specifically, the connector 120 includes a plurality of circumferentially spaced buckles 121, preferably four buckles 121, and the four circumferentially spaced buckles 121 provide stable and firm support for the assembly of the PVC sleeve 300 and the water-stop steel pipe 100, and can reduce material waste compared to wrapping the connector 120 around a circle.

[0050] In specific applications, the number of clips 121 is reasonably increased or decreased according to the cross-sectional size of the water-stop steel pipe 100 perpendicular to the axial direction and the arc length size of the clips 121. For example, in other embodiments, the clips 121 are provided in other numbers such as three, five or six.

[0051] The specific structure of the locking assembly of this embodiment is described below.

[0052] like Figure 4 As shown, in some embodiments, the locking assembly includes a matching first slot 321 and a first plug portion 311, the first plug portion 311 is arranged on the end surface of the first semicircular portion 310 facing the second semicircular portion 320; the first slot 321 is arranged on the end surface of the second semicircular portion 320 facing the first semicircular portion 310. In the process of assembling the PVC sleeve 300 and the waterproof steel pipe 100 into one for formwork, it is only necessary to first overlap the bottom ends of the first semicircular portion 310 and the second semicircular portion 320 with the connecting piece 120 along the radial direction of the PVC sleeve 300, and insert the first plug portion 311 into the corresponding first slot 321, so that the PVC sleeve 300 and the waterproof steel pipe 100 can be assembled into one on the basis of locking the first semicircular portion 310 and the second semicircular portion 320 to form a whole; after formwork and concrete pouring, it is only necessary to move the first semicircular portion 310 and the second semicircular portion 320 away from each other along the radial direction of the PVC sleeve 300 so that the first plug portion 311 is pulled out of the first slot 321, so that the PVC sleeve 300 and the waterproof steel pipe 100 can be separated from each other on the basis of separating the first semicircular portion 310 and the second semicircular portion 320 from each other, and the entire disassembly and assembly process has low technical difficulty, high construction efficiency and low labor intensity.

[0053] Specifically, the number of the first slots 321 is equal to the number of the first inserting parts 311, and the first inserting parts 311 are provided in plurality, and the plurality of first inserting parts 311 are provided at intervals along the axial direction of the PVC sleeve 300 on the first semicircular part 310; the locking firmness of the first semicircular part 310 and the second semicircular part 320 is increased, and the separation from each other under the impact of concrete during the pouring of concrete is avoided, so as to ensure the stability and firmness of the formwork. In specific applications, the number of the first slots 321 can also be set to be greater than the number of the first inserting parts 311.

[0054] In a specific application, the number of the first inserting parts 311 is reasonably increased or decreased according to the axial size of the PVC sleeve 300 . For example, in other embodiments, the first inserting parts 311 are provided in two, three or four quantities.

[0055] Specifically, the first slot 321 is configured to be tapered, and the size of the first slot 321 gradually decreases in the direction away from the first semicircular portion 310 . The first slot 321 is configured to be tapered so that the first semicircular portion 310 and the second semicircular portion 320 can be firmly assembled into the PVC sleeve 300 .

[0056] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the present invention.

Claims

1. An anti-seepage formwork structure for non-bonded prestressed anti-floating anchor, characterized in that: include: A water-stop steel pipe (100) is used to be arranged on the top of the anchor plate (210) and to be sleeved outside the top of the anchor rod (220); The PVC sleeve (300) is detachably connected to the top of the water-stop steel pipe (100) and is used to be sleeved on the top of the anchor rod (220). The PVC sleeve (300) includes a first semicircular portion (310) and a second semicircular portion (320) that are separately arranged. The first semicircular portion (310) and the second semicircular portion (320) are symmetrically arranged along the radial direction of the PVC sleeve (300) and are connected by a locking assembly.

2. The anti-seepage formwork structure for non-bonded prestressed anti-floating anchor according to claim 1, characterized in that: The inner wall of the water-stop steel pipe (100) is provided with a water-stop ring (110), and the water-stop ring (110) is arranged at one end of the water-stop steel pipe (100) relatively close to the PVC sleeve (300).

3. The anti-seepage formwork structure for non-bonded prestressed anti-floating anchor according to claim 2, characterized in that: The water stop ring (110) extends from outside to inside along the radial direction of the water stop steel pipe (100), and the water stop ring (110) is arranged to be gradually inclined downward.

4. An anti-seepage formwork structure for non-bonded prestressed anti-floating anchor according to any one of claims 1 to 3, characterized in that: The PVC sleeve (300) is coaxially arranged with the water-stop steel pipe (100); a connecting piece (120) is provided around the top end of the water-stop steel pipe (100), and the PVC sleeve (300) is sleeved outside the connecting piece (120) and is interference-fitted with the connecting piece (120).

5. The anti-seepage formwork structure for non-bonded prestressed anti-floating anchor according to claim 4, characterized in that: The outer diameter of the connecting piece (120) is smaller than the outer diameter of the water-stopping steel pipe (100).

6. The anti-seepage formwork structure for non-bonded prestressed anti-floating anchor according to claim 5, characterized in that: The outer diameter of the water-stop steel pipe (100) is equal to the outer diameter of the PVC sleeve (300).

7. The anti-seepage formwork structure for non-bonded prestressed anti-floating anchor according to claim 4, characterized in that: The connecting member (120) comprises a plurality of buckles (121) arranged at intervals along the circumferential direction.

8. The anti-seepage formwork structure for non-bonded prestressed anti-floating anchor according to claim 1, characterized in that: The locking assembly comprises: A first inserting portion (311) is arranged on an end surface of the first semicircular portion (310) facing the second semicircular portion (320); A first slot (321) is arranged on the end surface of the second semicircular portion (320) facing the first semicircular portion (310), and the first slot (321) matches the first inserting portion (311).

9. The anti-seepage formwork structure for non-bonded prestressed anti-floating anchor according to claim 8, characterized in that: The number of the first slots (321) is at least equal to the number of the first inserting portions (311), and a plurality of the first inserting portions (311) are provided, and the plurality of first inserting portions (311) are axially spaced apart from each other on the first semicircular portion (310).

10. The anti-seepage formwork structure for non-bonded prestressed anti-floating anchor according to claim 8 or 9, characterized in that: The first slot (321) is configured to be conical, and the size of the first slot (321) gradually decreases in a direction away from the first semicircular portion (310).

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