Composite anchor rod uplift screw pile

Abstract

The utility model relates to the field of composite type anti-pulling anchor rods, and discloses a composite anchor rod anti-pulling screw pile which comprises a screw pile body formed underground. The drill conductor is vertically inserted into the screw pile and is tightly combined with the screw pile; the rod rib is vertically inserted into the drill conductor and is tightly combined with the drill conductor through a filling material filled in the drill conductor; wherein the drill conductor is provided with a closed bottom, the top of the drill conductor is higher than the screw pile, and the top of the rod rib is higher than the drill conductor. According to the embodiment of the utility model, the external shape is provided with the threads, so that the friction force with soil is increased, and the anti-drawing performance is improved.

Description

Technical Field

[0001] The utility model relates to the field of composite anti-pullout anchor rods, in particular to a composite anchor rod anti-pullout screw pile. Background Art

[0002] A composite pull-out anchor (also known as a combined pull-out anchor) is an anchor with a concrete pile body, a waterproof casing and reinforcement. The concrete pile body is a prefabricated hollow tube or a cylinder cast underground. The waterproof casing and the reinforcement are connected to the concrete pile body through post-cast cement slurry, such as a combined reinforced pull-out anchor device disclosed in CN211472481U. The concrete pile body and the waterproof casing form a double-layer barrier to prevent groundwater from corroding the reinforcement.

[0003] Since the outer shape of the precast concrete pile body is a cylinder, the friction between the concrete pile body and the soil is small, so the pull-out resistance is poor. Utility Model Content

[0004] The purpose of the utility model is to provide a composite anchor anti-pullout screw pile to solve the problem of how to increase the friction between the composite anti-pullout anchor and the soil and improve the anti-pullout performance of the composite anti-pullout anchor.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] A composite anchor pull-out resistant screw pile comprises: a screw pile formed underground; a water-blocking casing vertically inserted into the interior of the screw pile and tightly combined with the screw pile; a rod reinforcement vertically inserted into the interior of the water-blocking casing and tightly combined with the water-blocking casing via a filling material filled in the water-blocking casing; wherein the water-blocking casing has a closed bottom, the top of the water-blocking casing is higher than the screw pile, and the top of the rod reinforcement is higher than the water-blocking casing.

[0007] Furthermore, after the bottom of the waterproof casing is sealed, it is inserted into the interior of the screw pile, and the concrete slurry inside the screw pile is squeezed to the peripheral side of the waterproof casing.

[0008] Furthermore, the bottom of the watertight casing is closed by a plug, and the plug is conical with the tip facing downward.

[0009] In another aspect of this embodiment, the bottom of the watertight casing is processed into a cone shape with the tip facing downward.

[0010] In another embodiment, the bottom of the waterproof casing is opened and inserted into the interior of the screw pile. After the concrete slurry inside the screw pile flows into the inner side of the waterproof casing, the bottom of the waterproof casing is closed.

[0011] Furthermore, the bottom of the water-blocking casing is sealed by a sealing layer, which is formed after the sealing material poured into the bottom of the water-blocking casing after removing the concrete slurry inside the water-blocking casing and solidifying.

[0012] Furthermore, an elastic air-permeable member is provided inside the waterproof casing, and the elastic air-permeable member is located below the sealing layer. The elastic air-permeable member is used to prevent concrete slurry from entering the interior of the waterproof casing and allow air to pass through.

[0013] Furthermore, at least one guide is welded to the outside of the watertight casing. When the number of the guides is greater than 1, multiple guides are distributed along the axis of the watertight casing. Each guide includes multiple bent ribs. Multiple bent ribs are evenly distributed around the axis of the watertight casing. The bent ribs are in the shape of arcs or broken lines. The bent ribs are in the same plane as the axis of the watertight casing. The bent ribs are made of bent steel bars or steel strips. Both ends of the bent ribs are welded to the wall of the watertight casing, and the middle end of the bent ribs protrudes outward.

[0014] Furthermore, a foundation is provided above the screw pile, and a sand filling layer is formed between the screw pile and the foundation.

[0015] Furthermore, the filling material is cement slurry, the waterproof casing is made of corrosion-resistant and tensile-resistant metal or non-metallic material, and the rod reinforcement is steel strand or precision-rolled threaded steel bar.

[0016] Compared with the prior art, this application has the following beneficial effects:

[0017] Provided is a composite anchor anti-pullout screw pile, the outer shape of which has threads, which increases the friction between the pile and the soil and improves the anti-pullout performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0019] Figure 1 A sectional view of a longitudinal section of the first embodiment of the present invention;

[0020] Figure 2 A cross-sectional view of a first embodiment of the present invention;

[0021] Figure 3This is a longitudinal cross-sectional view of a second embodiment of the present invention, showing the process of extracting concrete slurry from the interior of the waterproof casing;

[0022] Figure 4 This is a longitudinal cross-sectional view of a second embodiment of the present invention, showing the working condition of forming a sealing layer at the bottom of the waterproof casing;

[0023] The numbers in the figure represent the following:

[0024] 1-screw pile; 2-waterproof casing; 21-plug; 22-mud pipe; 23-elastic breathable part; 24-isolation layer; 25-sealing layer; 3-rebar; 4-foundation; 5-sand filling layer; 6-guide. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] A composite pull-out anchor (also known as a combined pull-out anchor) is an anchor with a concrete pile body, a waterproof casing and reinforcement. The reinforcement is set in the middle of the concrete pile body, the waterproof casing is set inside the concrete pile body and is sleeved on the outside of the reinforcement. The reinforcement is used to bear the pull-out force. The concrete pile body and the waterproof casing form a double-layer barrier to prevent groundwater from corroding the reinforcement.

[0027] The concrete pile body of the traditional composite pull-out anchor is a prefabricated hollow tube or a cylinder cast underground. The waterproof casing and the reinforcement are connected to the concrete pile body through post-cast cement slurry, such as the combined reinforced pull-out anchor device disclosed in CN211472481U.

[0028] Compared with the concrete pile body of traditional composite pull-out anchor rods, screw piles have stronger pull-out resistance. However, under the action of pull-out force, the pile body of traditional screw piles is prone to cracking. The corrosive medium entering the cracks of the pile body is easy to corrode the stressed steel bars, resulting in reduced component safety and weak corrosion resistance. Pull-out piles increase the amount of reinforcement to control the crack width, and the strength of the steel bars cannot be fully exerted. The steel bar content of single concrete is high, the number of main steel bars is large, and each main steel bar needs to be water-proofed, which makes construction difficult and the construction period long.

[0029] Since screw piles cannot be prefabricated, the existing construction method of composite pull-out anchors cannot be applied to screw piles. Therefore, people need a composite anchor pull-out screw pile that has the advantages of both screw piles and composite pull-out anchors.

[0030] (First embodiment)

[0031] The following provides a composite anchor anti-pullout screw pile and its construction method, combined with Figure 1 and Figure 2 The construction steps of the composite anchor anti-pullout screw pile include: prefabricating the waterproof casing 2 and the rod reinforcement 3, sealing the bottom of the waterproof casing 2, casting the screw pile 1 underground, and then using a vibrator to insert the waterproof casing 2 into the interior of the screw pile 1 before the screw pile 1 solidifies, ensuring that the top of the waterproof casing 2 is higher than the screw pile 1, then filling the waterproof casing 2 with cement slurry, and then inserting the rod reinforcement 3 into the waterproof casing 2, waiting for the screw pile 1 and the cement slurry to solidify to form a composite anchor anti-pullout screw pile.

[0032] One or more waterproof casings 2 can be inserted into the interior of a screw pile 1. When there are a large number of waterproof casings 2, they can be pre-fixed and connected as one, and then inserted into the interior of the screw pile 1.

[0033] One or more reinforcement bars 3 can be inserted into each waterproof casing 2. The material of the reinforcement bars 3 can be steel strands or precision-rolled threaded steel bars, both of which have excellent pull-out resistance. Under the double-layer waterproofing effect of the concrete pile body of the screw pile 1 and the waterproof casing 2, the reinforcement bars 3 do not need to be waterproofed.

[0034] The water-blocking casing 2 is not only used to isolate the reinforcement 3 and groundwater, but also serves as the skeleton of the screw pile 1. The material of the water-blocking casing 2 is a corrosion-resistant and tensile-resistant metal or non-metal, such as a low-pressure fluid conveying welded pipe. The water-blocking casing 2 also has a certain pull-out resistance and will not crack or leak water when the screw pile 1 is subjected to an upward pull force.

[0035] Preferably, the bottom end of the riser 2 is closed by a plug 21 , and the plug 21 is conical with the tip set downward, so that the riser 2 is easier to insert into the interior of the screw pile 1 .

[0036] Preferably, at least one guide 6 is welded to the outside of the watertight casing 2. When the number of guides 6 is greater than 1, multiple guides 6 are distributed along the axis of the watertight casing 2. Each guide 6 includes four bends, and the four bends are evenly distributed around the axis of the watertight casing 2. The bends are in the shape of arcs or broken lines. The bends and the axis of the watertight casing 2 are in the same plane. The bends are made of bent steel bars or steel strips. The two ends of the bends are welded to the wall of the watertight casing 2, and the middle end of the bends protrudes outward.

[0037] In addition, after the screw pile 1 is cast, it is necessary to connect the screw pile and the foundation 4 as one. The construction steps include: building a mold for the foundation 4 on the ground, tying the rod reinforcement 3 and the steel frame of the foundation 4 as one, and then pouring concrete into the inside of the mold. After the concrete solidifies, the foundation 4 and the screw pile 1 are connected as one through the rod reinforcement 3.

[0038] Preferably, during the construction of the foundation 4, the reinforcement bars 3 may be tensioned and anchored with clip anchors, thereby applying prestress to the composite anchor anti-pullout screw piles. Preferably, before the foundation 4 is constructed on the ground, the soil above the screw piles 1 may be excavated and backfilled with loose sand material to form a sand filling layer 5. The thickness of the sand filling layer 5 ranges from 100 mm to 150 mm to reduce stress concentration at the top of the pile. The top of the reinforcement bar 3 passes through the sand filling layer 5 to connect to the steel skeleton of the foundation 4.

[0039] In summary, combined with Figure 1 , composite anchor anti-pullout screw piles include:

[0040] Screw pile 1, formed in the ground;

[0041] The waterproof casing 2 has a closed bottom and is vertically inserted into the screw pile 1, and an open top and is higher than the screw pile 1;

[0042] The reinforcement bar 3 is vertically inserted into the interior of the waterproof casing 2 and is tightly combined with the waterproof casing 2 through the filling material filled in the waterproof casing 2.

[0043] The top of the reinforcement bar 3 is higher than the waterproof casing 2, and the filling material is preferably cement slurry.

[0044] The composite anchor pull-out screw pile has the advantages of both the screw pile 1 and the composite pull-out anchor. The screw pile 1 and the waterproof casing 2 prevent the rod reinforcement 3 from being corroded by groundwater, so that the rod reinforcement 3 can fully exert its pull-out resistance. The overall pull-out resistance is better than the traditional screw pile 1 and the traditional composite pull-out anchor.

[0045] The cement slurry in the first embodiment can be replaced by other materials that can tightly bond the waterproof casing 2 and the reinforcement 3 after solidification, such as metal glue, epoxy resin, etc.

[0046] (Second embodiment)

[0047] When the diameter of the water-blocking sleeve 2 is large or the number is large, pre-sealing the bottom of the water-blocking sleeve 2 will cause the water-blocking sleeve 2 to encounter greater resistance when inserted into the concrete, especially when the depth is large or the concrete fluidity is low. In order to solve this problem, the bottom of the water-blocking sleeve 2 can be not sealed in advance, and the water-blocking sleeve 2 with an open bottom can be directly inserted into the interior of the screw pile 1. The concrete inside the screw pile 1 can naturally flow into the interior of the water-blocking sleeve 2, reducing the resistance encountered when the water-blocking sleeve 2 is inserted into the concrete. After the bottom of the water-blocking sleeve 2 reaches the predetermined depth, the bottom of the water-blocking sleeve 2 is sealed.

[0048] There are two methods for sealing the bottom of the waterproof casing 2 after the bottom of the waterproof casing 2 reaches a predetermined depth.

[0049] Method 1: A closable mechanism, such as a valve and an airbag, is pre-placed at the bottom of the watertight casing 2. After the bottom of the watertight casing 2 reaches a predetermined depth, the valve is closed by pulling the steel wire pre-placed inside the watertight casing 2 so that the valve seals the bottom of the watertight casing 2, or the airbag is inflated through a pipe pre-placed inside the watertight casing 2 so that the expanded airbag seals the bottom of the watertight casing 2.

[0050] Method 2: Remove the concrete slurry inside the waterproof casing 2 while inserting the waterproof casing 2, or remove the concrete slurry inside the waterproof casing 2 after the bottom of the waterproof casing 2 reaches a predetermined depth, then seal the bottom of the waterproof casing 2, and then backfill with cement slurry.

[0051] Method 1 has lower reliability because the valve is easily blocked by concrete slurry and is difficult to close completely. The airbag may age or rupture if placed in solidified concrete for a long time. Therefore, method 2 is preferred.

[0052] Specific, combined Figure 3 , use a vibrator to insert the waterproof casing 2 into the interior of the screw pile 1, and at the same time place a mud pipe 22 inside the waterproof casing 2. The mud pipe 22 and the waterproof casing 2 are lowered synchronously. After the concrete slurry inside the screw pile 1 enters the waterproof casing 2, it is immediately pumped away by the mud pipe 22. Figure 4 After the bottom of the water-blocking casing 2 reaches the predetermined depth, the mud pipe 22 is removed and the interior of the water-blocking casing 2 is empty. Then, epoxy resin is poured into the bottom of the water-blocking casing 2. After solidification, the epoxy resin forms a waterproof sealing layer 25. Then, cement slurry is backfilled into the interior of the water-blocking casing 2, and finally, the reinforcement 3 is implanted into the interior of the water-blocking casing 2.

[0053] Preferably, the end of the mud pipe 22 is close to and higher than the bottom of the watertight casing 2, and the end of the mud pipe 22 is pre-wrapped with a cylindrical elastic breathable member 23. The material of the elastic breathable member 23 is sponge, and the outer wall of the elastic breathable member 23 is adhered to the inner wall of the watertight casing 2.

[0054] During the process of inserting the water-blocking sleeve 2 into the screw pile 1, the elastic breathable member 23 is used to prevent the passage of concrete slurry without hindering the passage of air. After the mud pipe 22 is pulled out of the water-blocking sleeve 2, the through hole located in the center of the elastic breathable member 23 for the mud pipe 22 to pass through is closed during the natural expansion of the elastic breathable member 23, thereby forming a barrier layer 24 that prevents the concrete slurry from floating up, and at the same time provides a flat bearing surface for the epoxy resin that is subsequently poured into the bottom of the water-blocking sleeve 2. The sealing layer 25 formed after the epoxy resin solidifies directly contacts the inner wall of the water-blocking sleeve 2, preventing the concrete slurry from entering the gap between the epoxy resin and the water-blocking sleeve 2 to form a leakage site.

[0055] The elastic breathable member 23 in the embodiment can be replaced by other materials with elasticity and breathability, such as porous silicone, polyurethane foam, EVA foam, etc. The epoxy resin in the embodiment can be replaced by other materials that have water-proof properties and are not easy to crack after solidification, such as polyurethane resin, polysulfide sealant, water glass, polymer waterproof coating, etc.

[0056] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present invention.

Claims

1. A composite anchor anti-pullout screw pile, characterized in that: include: Screw pile (1), formed in the ground; A water-resistant casing (2) is vertically inserted into the interior of the screw pile (1) and is tightly combined with the screw pile (1); A reinforcement bar (3) is vertically inserted into the interior of the waterproof casing (2) and is tightly combined with the waterproof casing (2) through a filling material filled in the interior of the waterproof casing (2); The water-blocking casing (2) has a closed bottom, the top of the water-blocking casing (2) is higher than the screw pile (1), and the top of the reinforcement (3) is higher than the water-blocking casing (2).

2. The composite anchor anti-pullout screw pile according to claim 1, characterized in that: The bottom of the waterproof casing (2) is sealed and then inserted into the interior of the screw pile (1), and the concrete slurry inside the screw pile (1) is squeezed to the peripheral side of the waterproof casing (2).

3. The composite anchor anti-pullout screw pile according to claim 2, characterized in that: The bottom of the watertight casing (2) is closed by a plug (21), and the plug (21) is in a conical shape with the tip facing downward.

4. The composite anchor anti-pullout screw pile according to claim 2, characterized in that: The bottom of the water-blocking casing (2) is processed into a cone shape with the tip facing downward.

5. The composite anchor anti-pullout screw pile according to claim 1, characterized in that: When the bottom of the water-blocking sleeve (2) is opened, it is inserted into the interior of the screw pile (1). After the concrete slurry inside the screw pile (1) flows into the inner side of the water-blocking sleeve (2), the bottom of the water-blocking sleeve (2) is closed.

6. The composite anchor anti-pullout screw pile according to claim 5, characterized in that: The bottom of the waterproof casing (2) is sealed by a sealing layer (25), which is formed after the sealing material poured into the bottom of the waterproof casing (2) after removing the concrete slurry inside the waterproof casing (2) and solidifies.

7. The composite anchor anti-pullout screw pile according to claim 6, characterized in that: An elastic air-permeable member (23) is provided inside the water-blocking sleeve (2), and the elastic air-permeable member (23) is located below the sealing layer (25). The elastic air-permeable member (23) is used to prevent concrete slurry from entering the interior of the water-blocking sleeve (2) and allow air to pass through.

8. The composite anchor anti-pullout screw pile according to claim 1, characterized in that: At least one guide (6) is welded to the outer side of the water-blocking sleeve (2). When the number of the guides (6) is greater than 1, a plurality of the guides (6) are distributed along the axis of the water-blocking sleeve (2). Each of the guides (6) includes a plurality of bends. The plurality of bends are evenly distributed around the axis of the water-blocking sleeve (2). The bends are in the shape of arcs or broken lines. The bends are in the same plane as the axis of the water-blocking sleeve (2). The bends are made of bent steel bars or steel strips. The two ends of the bends are welded to the wall of the water-blocking sleeve (2), and the middle end of the bends protrudes outward.

9. A composite anchor anti-pullout screw pile according to any one of claims 1 to 8, characterized in that: A foundation (4) is provided above the screw pile (1), and a sand filling layer (5) is formed between the screw pile (1) and the foundation (4).

10. The composite anchor anti-pullout screw pile according to claim 1, characterized in that: The filling material is cement slurry, the water-blocking casing (2) is made of corrosion-resistant and tensile-resistant metal or non-metal material, and the rod (3) is steel strand or precision-rolled threaded steel bar.

Images