Novel miniature steel pipe pile structure

Abstract

The utility model provides a novel miniature steel pipe pile structure. The steel pipe pile structure comprises a pile body drill hole, a steel pipe body and grouting reinforcing bodies poured in the steel pipe body and between the steel pipe body and the pile body drill hole, the steel pipe body is of a hollow pipe body structure, and a pipe bottom bracket is arranged at the bottom of the steel pipe body. The steel pipe body is arranged in a pile body drill hole, a hole sealing structure is arranged between an orifice of the pile body drill hole and the steel pipe body for sealing, an exhaust pipe is arranged at the position of the hole sealing structure, the bottom of the steel pipe body makes contact with the bottom face of the pile body drill hole through a pipe bottom bracket, and a grouting channel is formed between the bottom face of the steel pipe body and the pile body drill hole. According to the utility model, the steel pipe does not need to be punched or cut in any form, so that the construction difficulty of the steel pipe pile is reduced, the construction cost and the time cost are reduced, and the damage to the structural integrity of the steel pipe is avoided, thereby reducing the bearing capacity and prolonging the service life of the steel pipe pile; and high efficiency and safety of the grouting process are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to civil engineering technical field, concretely a novel micro steel pipe pile structure, aims at improving the stability and safety of embankment slope. BACKGROUND

[0002] The micro steel pipe pile is a commonly used structure for slope reinforcement, which ingeniously combines the grouting method and the micro pile method together, and forms a new type of reinforcement structure by tightly combining the micro pile and the grouting body, so as to reinforce part of the sliding body in the landslide into the anti-sliding body, thereby achieving the purpose of effectively treating the landslide.

[0003] The traditional micro steel pipe pile adopts the overall steel pipe structure, and the bottom end is set as a conical closed end. The eye is chiseled on the side wall of the steel pipe. When grouting, the grout is injected from the upper port of the micro steel pipe pile under high pressure, and enters the gap between the steel pipe and the drill hole through the steel pipe eye. Since the steel pipe is made of high-strength steel material through processes such as curling and welding, the internal organization is tight and uniform, and can withstand a large pressure and tension. In the existing steel pipe pile eye manufacturing process, local cutting or punching needs to be performed on the steel pipe wall, which will inevitably cause the material continuity of the pipe wall in this area to be damaged, forming a stress concentration point. These stress concentration points are more likely to become the starting point of crack initiation and propagation when subjected to external force, i.e. during grouting, thereby reducing the overall bearing capacity of the steel pipe. Moreover, chiseling the eye may also cause local corrosion of the steel pipe. In the grouting process, the chemical components in the grout may react with the steel pipe material, especially at the edge of the eye, due to the damage of the material structure and the increase of the surface area, the reaction may be more intense, which may cause corrosion of the steel pipe wall around the eye over a long period of time, further weakening the strength of the steel pipe. Secondly, the quality of the eye chiseling process directly affects the strength and durability of the steel pipe. If the eye chiseling process is not proper, it may damage the original structure of the steel pipe, such as uneven size, shape and distribution of the eye, or defects such as burrs and cracks generated during the chiseling process are not effectively treated, which will adversely affect the mechanical properties of the steel pipe and further adversely affect the overall strength. These defects may cause uneven stress distribution when stressed, accelerating the fatigue damage of the steel pipe. SUMMARY

[0004] In view of the problems existing in the prior art, the present application provides a novel micro steel pipe pile structure, which can perform efficient grouting without punching, thereby avoiding the influence of punching on the overall strength of the steel pipe and the fatigue damage problem caused thereby.

[0005] The utility model discloses a novel micro steel pipe pile structure, including pile body drilling, steel pipe body and the grouting reinforcement body that is being grouted in steel pipe body and between steel pipe body and pile body drilling, the steel pipe body is hollow pipe body structure, is equipped with pipe bottom bracket in the bottom of steel pipe body, the steel pipe body is placed in the pile body drilling, and the hole mouth between the pile body drilling and steel pipe body is equipped with the hole sealing structure and is blocked, and is equipped with the exhaust pipe at the hole sealing structure, and the bottom of steel pipe body is contacted with the bottom surface of the pile body drilling through pipe bottom bracket, and forms the grouting channel between the bottom surface of steel pipe body and the pile body drilling, the grouting reinforcement body is the cement slurry reinforcement structure that is formed through the high pressure grouting of grouting hose inserted in steel pipe body.

[0006] The utility model discloses a novel micro steel pipe pile structure, including pile body drilling, steel pipe body and the grouting reinforcement body that is being grouted in steel pipe body and between steel pipe body and pile body drilling, the steel pipe body is hollow pipe body structure, is equipped with pipe bottom bracket in the bottom of steel pipe body, the steel pipe body is placed in the pile body drilling, and the hole mouth between the pile body drilling and steel pipe body is equipped with the hole sealing structure and is blocked, and is equipped with the exhaust pipe at the hole sealing structure, and the bottom of steel pipe body is contacted with the bottom surface of the pile body drilling through pipe bottom bracket, and forms the grouting channel between the bottom surface of steel pipe body and the pile body drilling, the grouting reinforcement body is the cement slurry reinforcement structure that is formed through the high pressure grouting of grouting hose inserted in steel pipe body.

[0007] The utility model discloses a novel micro steel pipe pile structure, including pile body drilling, steel pipe body and the grouting reinforcement body that is being grouted in steel pipe body and between steel pipe body and pile body drilling, the steel pipe body is hollow pipe body structure, is equipped with pipe bottom bracket in the bottom of steel pipe body, the steel pipe body is placed in the pile body drilling, and the hole mouth between the pile body drilling and steel pipe body is equipped with the hole sealing structure and is blocked, and is equipped with the exhaust pipe at the hole sealing structure, and the bottom of steel pipe body is contacted with the bottom surface of the pile body drilling through pipe bottom bracket, and forms the grouting channel between the bottom surface of steel pipe body and the pile body drilling, the grouting reinforcement body is the cement slurry reinforcement structure that is formed through the high pressure grouting of grouting hose inserted in steel pipe body.

[0008] The utility model discloses a novel micro steel pipe pile structure, including pile body drilling, steel pipe body and the grouting reinforcement body that is being grouted in steel pipe body and between steel pipe body and pile body drilling, the steel pipe body is hollow pipe body structure, is equipped with pipe bottom bracket in the bottom of steel pipe body, the steel pipe body is placed in the pile body drilling, and the hole mouth between the pile body drilling and steel pipe body is equipped with the hole sealing structure and is blocked, and is equipped with the exhaust pipe at the hole sealing structure, and the bottom of steel pipe body is contacted with the bottom surface of the pile body drilling through pipe bottom bracket, and forms the grouting channel between the bottom surface of steel pipe body and the pile body drilling, the grouting reinforcement body is the cement slurry reinforcement structure that is formed through the high pressure grouting of grouting hose inserted in steel pipe body.

[0009] The utility model discloses a novel micro steel pipe pile structure, including pile body drilling, steel pipe body and the grouting reinforcement body that is being grouted in steel pipe body and between steel pipe body and pile body drilling, the steel pipe body is hollow pipe body structure, is equipped with pipe bottom bracket in the bottom of steel pipe body, the steel pipe body is placed in the pile body drilling, and the hole mouth between the pile body drilling and steel pipe body is equipped with the hole sealing structure and is blocked, and is equipped with the exhaust pipe at the hole sealing structure, and the bottom of steel pipe body is contacted with the bottom surface of the pile body drilling through pipe bottom bracket, and forms the grouting channel between the bottom surface of steel pipe body and the pile body drilling, the grouting reinforcement body is the cement slurry reinforcement structure that is formed through the high pressure grouting of grouting hose inserted in steel pipe body.

[0010] The utility model discloses a novel micro steel pipe pile structure, including pile body drilling, steel pipe body and the grouting reinforcement body that is being grouted in steel pipe body and between steel pipe body and pile body drilling, the steel pipe body is hollow pipe body structure, is equipped with pipe bottom bracket in the bottom of steel pipe body, the steel pipe body is placed in the pile body drilling, and the hole mouth between the pile body drilling and steel pipe body is equipped with the hole sealing structure and is blocked, and is equipped with the exhaust pipe at the hole sealing structure, and the bottom of steel pipe body is contacted with the bottom surface of the pile body drilling through pipe bottom bracket, and forms the grouting channel between the bottom surface of steel pipe body and the pile body drilling, the grouting reinforcement body is the cement slurry reinforcement structure that is formed through the high pressure grouting of grouting hose inserted in steel pipe body.

[0011] The utility model discloses a novel micro steel pipe pile structure, including pile body drilling, steel pipe body and the grouting reinforcement body that is being grouted in steel pipe body and between steel pipe body and pile body drilling, the steel pipe body is hollow pipe body structure, is equipped with pipe bottom bracket in the bottom of steel pipe body, the steel pipe body is placed in the pile body drilling, and the hole mouth between the pile body drilling and steel pipe body is equipped with the hole sealing structure and is blocked, and is equipped with the exhaust pipe at the hole sealing structure, and the bottom of steel pipe body is contacted with the bottom surface of the pile body drilling through pipe bottom bracket, and forms the grouting channel between the bottom surface of steel pipe body and the pile body drilling, the grouting reinforcement body is the cement slurry reinforcement structure that is formed through the high pressure grouting of grouting hose inserted in steel pipe body.

[0012] (1) The utility model discloses a steel pipe pile, and the bottom of the steel pipe is welded with a special pipe bottom bracket, and the pipe bottom bracket plays a key supporting role after the steel pipe is installed in the predetermined drilling, and the bottom of the steel pipe and the bottom of the drilling are kept a certain overhead distance. The overhead design effectively avoids that the bottom of the steel pipe directly sticks to the hole bottom, thereby eliminating the grouting difficulty caused by close contact. The structure improvement of the steel pipe pile avoids punching the steel pipe structure, and does not need to punch or cut the steel pipe in any form, thereby saving the construction difficulty of the steel pipe pile, reducing the construction cost and time cost, protecting the original structure of the steel pipe, avoiding damaging the structural integrity of the steel pipe, thereby reducing the bearing capacity, and prolonging the service life of the steel pipe pile. And the efficiency and safety of the grouting process are ensured.

[0013] (2) The pipe bottom bracket of the micro steel pipe pile is made of high-strength and corrosion-resistant material, and its shape and size are accurately calculated to ensure that it can closely fit the bottom of the steel pipe and has a certain bearing capacity. The use of the pipe bottom bracket also makes it possible to perform pressure grouting when grouting inside and outside the steel pipe. Because of the bracket, the grouting slurry can flow more smoothly into the medium around the drilling through the steel pipe without being affected by the resistance caused by the close contact between the bottom of the steel pipe and the hole bottom. This not only improves the grouting efficiency, but also ensures the uniformity and quality of the grouting. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic view of the micro steel pipe pile in the utility model;

[0015] Figure 2 is a schematic view of the micro steel pipe pile without grouting in the utility model;

[0016] Figure 3 is a structural schematic view of the steel pipe of the micro steel pipe pile in the utility model;

[0017] Figure 4 is an application reference drawing of the utility model.

[0018] In the drawing: 1 - micro steel pipe pile, 100 - pile body drilling, 101 - steel pipe body, 102 - grouting reinforcement body, 103 - pipe bottom bracket, 104 - grouting hose, 105 - exhaust pipe, 106 - hole sealing structure, 107 - support lug, 108 - connecting sleeve, 2 - operation platform, 3 - embankment slope, 4 - crown beam, 400 - double-layer double-direction steel bar, 5 - water interception ditch, 6 - road surface, 7 - drainage ditch, 8 - backfill slope, 9 - sliding surface. DETAILED DESCRIPTION

[0019] In order to further understand the invention content, characteristics and effects of the utility model, the utility model will be further described below in combination with the drawings and examples. The drawings show Figures 1 to 3All are the drawings of the embodiments, are drawn in a simplified way, and are only used for the purpose of clearly and concisely illustrating the embodiments of the utility model. The technical solutions shown in the drawings below are specific schemes of the embodiments of the utility model, and are not intended to limit the scope of the utility model claimed. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0020] In the embodiment, as shown in the figure, Figures 1 to 3 The micro steel pipe pile comprises a pile body drill hole 100, a steel pipe body 101 and a grouting reinforcement 102 poured in the steel pipe body 101 and between the steel pipe body 101 and the pile body drill hole 100. The steel pipe body 101 is a hollow pipe body structure, and a pipe bottom bracket 103 is arranged at the bottom of the steel pipe body 101. The steel pipe body 101 is arranged in the pile body drill hole 100, a hole sealing structure 106 is arranged between the hole opening of the pile body drill hole 100 and the steel pipe body 101 for plugging, an exhaust pipe 105 is arranged at the hole sealing structure 106, the bottom of the steel pipe body 101 is in contact with the bottom surface of the pile body drill hole 100 through the pipe bottom bracket 103, and a grouting passage is formed between the bottom surface of the steel pipe body 101 and the pile body drill hole 100. A grouting hose 104 is inserted into the steel pipe body 101, the grouting hose 104 extends from the pipe opening of the steel pipe body 101 to the bottom of the steel pipe body 101, and extends into the bottom of the pile body drill hole 100 through the grouting passage. The diameter of the pile body drill hole 100 is 150-250 mm, and the diameter of the steel pipe body 101 is at least 50 mm smaller than the diameter of the pile body drill hole 100. The steel pipe body 101 is a pipe body structure formed by connecting multiple steel pipes through a connecting sleeve 108. The steel pipe body 101 is inserted into the axis of the pile body drill hole 100, and support lugs 107 are arranged at intervals on both sides of the steel pipe body 101. The pipe bottom bracket 103 comprises two groups of symmetrically arranged U-shaped steel reinforcement racks, and the openings of the U-shaped steel reinforcement racks are welded integrally with the lower pipe opening of the steel pipe body 101. The hole sealing structure 106 is a sealing structure formed by sealing the hole with cement soil in the range of 0.8-1.2 soil layers below the hole opening of the pile body drill hole 100, and the exhaust pipe 105 is inserted during the sealing process. The upper end of the exhaust pipe 105 extends out of the pile body drill hole 100, and the lower end of the exhaust pipe 105 extends into the pile body drill hole 100 through the hole sealing structure 106. The grouting reinforcement 102 is a cement grouting reinforcement structure formed by high-pressure grouting through the grouting hose 104.

[0021] The novel micro steel pipe pile structure in the embodiment is mainly used for reinforcing the slope. The micro steel pipe pile of the utility model will be further described in combination with specific embodiments. For example, Figure 4As shown, the embankment slope 3 is reinforced, and the specific reinforcing method is: a working platform 2 is constructed in the middle of the embankment slope 3, and a plurality of micro steel pipe piles 1 in the utility model are arranged on the working platform 2, the working platform 2 is a construction platform formed by excavating the slope surface above the platform and piling the slope surface below the platform in the middle of the embankment slope 3; the pile bottom of each micro steel pipe pile 1 extends to below the sliding surface of the embankment slope 3 by at least 2 / 5 of the length of the micro steel pipe pile, the pile top of the micro steel pipe pile 1 is located on the working platform 2, and the pile tops of the plurality of micro steel pipe piles 1 are connected into one body through a crown beam 4; after the construction of the micro steel pipe pile 1 is completed, the embankment slope 3 above the working platform 2 is backfilled to the slope of the original slope surface; a water intercepting ditch 5 is arranged at the top of the embankment slope 3, the water intercepting ditch 5 is located at the edge of the road surface 6 adjacent to the side of the embankment slope 3; a drainage ditch 7 is arranged at the bottom of the embankment slope 3; the width of the working platform is 4m-6m, which is composed of slope excavation and slope backfilling. The cross-sectional size of the crown beam 4 is expanded by at least 0.1m on both sides of the micro steel pipe pile 1, and the height is not less than 0.5m.

[0022] The micro steel pipe pile is constructed as follows: a drilling machine is used to drill a hole on the operation platform 2, the drilling machine is moved to make the center of the drilling tool substantially align with the center of the casing, the drill bit is lifted, and the drilling machine is moved to make the center of the drill bit directly face the pile position. The deviation of the pile position should be controlled within 20 mm, and the deviation of the verticality of the straight pile should not be greater than 1%. The drilling machine forms a hole: a small drilling machine is used to form a hole, the hole inclination is less than 1%, the hole depth error is less than 50 mm, and the pile diameter error is less than 10 mm. During the construction of the micro pile, the perforation and the phenomenon that the slurry flows a large amount along the sand layer should be prevented, and the following measures can be used for treatment: hole skipping construction, intermittent construction, and increasing the amount of the quick-setting agent. In order to prevent eccentricity, the grouting micro steel pipe pile 1 has a hole diameter of 200 mm, the steel pipe is inserted into the center, the steel pipe with a specification of ∅114*8.0 mm is placed, every 2 m of the steel pipe is welded with three ear lugs 2 along the circumference of the steel pipe, the three ear lugs are 120°, and the diameter of the ear lug is 8 mm. The ear lug is used to ensure that the micro steel pipe pile and the side wall of the hole have a certain safety distance, so that the cement mortar 6 can be filled between the micro steel pipe pile and the side wall of the hole, as a protective layer of the micro steel pipe pile, and play a rust-proof role. In order to prevent the steel pipe from being tightly attached to the bottom of the hole and causing grouting difficulty, a pipe bottom bracket 4 with a length of about 10 cm needs to be welded at the bottom of the pipe. The pipe bottom bracket 4 is welded by a steel bar with a diameter of 12 mm and the micro steel pipe pile, the steel bar is in a U shape, the vertical length is 0.3 m, the bottom of the steel pipe and the bottom of the hole are raised by the pipe bottom bracket 4, and the pressure grouting during the grouting inside and outside the steel pipe is ensured. The measure can avoid punching on the structure of the steel pipe, does not need to use the micro pile 1 steel pipe structure grouting, reduces the time and labor of punching on the steel pipe, and damages the steel pipe structure. When the steel pipe is used to manufacture the micro pile, the steel bar should be connected as much as possible by using a sleeve connection. Of course, the steel pipe connection can also be connected by welding a sleeve into a larger steel pipe 3, but the butt welding should be avoided as much as possible. The cement soil hole sealing 8 is used in the range of 1.0 m of the soil layer below the ground surface of the hole, and the ∅20 mm PVC exhaust pipe 7 with L=1500 mm is inserted, so as to exhaust the gas in the hole. After a certain strength is obtained, the steel pipe top port is connected to the grouting hose 5 to high-pressure grout into the hole. The slurry uses P.O. 42.5 Portland cement mortar 6 with a mark of M30, a water-cement ratio of 0.4~0.45, and a cement-sand ratio of 1:1. The grouting pressure is controlled within 1.5~2.5 MPa.

[0023] In summary, the content of the utility model is not limited in the above-mentioned embodiments, and people with insight in the same field can easily propose other embodiments within the technical guidance idea of the utility model, but such embodiments are included in the scope of the utility model.

Claims

1. A new micro steel pipe pile structure, characterized by: The steel pipe pile structure comprises a pile body drill hole (100), a steel pipe body (101), and a grouting reinforcement body (102) poured in the steel pipe body (101) and between the steel pipe body (101) and the pile body drill hole (100), the steel pipe body (101) is a hollow pipe body structure, a pipe bottom bracket (103) is arranged at the bottom of the steel pipe body (101); the steel pipe body (101) is arranged in the pile body drill hole (100), the hole opening of the pile body drill hole (100) and the steel pipe body (101) are blocked by a hole sealing structure (106), an exhaust pipe (105) is arranged at the hole sealing structure (106), the bottom of the steel pipe body (101) is in contact with the bottom surface of the pile body drill hole (100) through the pipe bottom bracket (103), and a grouting channel is formed between the bottom surface of the steel pipe body (101) and the pile body drill hole (100); the grouting reinforcement body (102) is a cement grout reinforcement structure formed by high-pressure grouting of a grouting hose inserted into the steel pipe body (101).

2. A new type of micro steel pipe pile structure according to claim 1, characterized by: The steel pipe body (101) is a pipe body structure formed by connecting multiple steel pipes through a connecting sleeve (108), the steel pipe body (101) is inserted into the pile body drill hole (100) on the axis, and support lugs (107) are arranged on both sides of the steel pipe body (101) at intervals.

3. A new type of micro steel pipe pile structure according to claim 1 or 2, characterized in that: The pipe bottom bracket (103) comprises two groups of symmetrically arranged U-shaped steel reinforcement frames, the openings of the U-shaped steel reinforcement frames are welded to be integrated with the lower pipe opening of the steel pipe body (101).

4. A new type of micro steel pipe pile structure according to claim 1 or 2, characterized in that: The diameter of the pile body drill hole (100) is 150-250 mm, and the diameter of the steel pipe body (101) is less than the diameter of the pile body drill hole (100) by at least 50 mm.

5. A new type of micro steel pipe pile structure according to claim 1 or 2, characterized in that: The grouting hose (104) extends from the upper pipe opening of the steel pipe body (101) to the bottom of the steel pipe body (101) and extends into the bottom of the pile body drill hole (100) through the grouting channel.

6. A new type of micro steel pipe pile structure according to claim 1 or 2, characterized in that: The hole sealing structure (106) is a sealing structure formed by sealing the hole with cement soil in the range of 0.8-1.2 soil layers below the hole opening of the pile body drill hole (100) on the ground surface, and the exhaust pipe (105) is inserted during the hole sealing process, the upper end of the exhaust pipe (105) extends out of the pile body drill hole (100), and the lower end of the exhaust pipe (105) extends into the pile body drill hole (100) through the hole sealing structure (106).

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