Micro steel pipe pile for slope reinforcement and construction method thereof

Abstract

The present invention provides a micro steel pipe pile for slope reinforcement and a construction method thereof. The steel pipe pile includes a lower tube body, an upper tube body and a cylindrical connector connecting the lower tube body and the upper tube body, the bottom end of the lower tube body has a closed pointed head, and the upper tube body is provided with a grouting pipe fitting; the cylindrical connector includes an upper flange ring, a grout retaining cylinder, a lower flange ring and a plurality of slides. The lower tube body and the upper tube body are installed together by designing a cylindrical connector to form a micro steel pipe pile as a whole. After being inserted into the soil, high-pressure concrete is filled, and finally a concrete block integrated with the cylindrical connector is formed on the outside of the cylindrical connector, so that the micro steel pipe pile as a whole has a better effect of resisting lateral shear force and pull-out force in the length direction, which greatly increases its stability and plays a more excellent use effect in the process of slope reinforcement.

Description

Technical Field

[0001] The invention relates to the technical field of slope reinforcement, in particular to a micro steel pipe pile for slope reinforcement and a construction method thereof. Background Art

[0002] Slope is a very common form of engineering, usually referring to natural slopes and artificial slopes. The slope environment is one of the basic engineering environments for people to engage in engineering construction. In this increasingly crowded era, the demand for space is increasing for humans. People continue to develop land through engineering construction. With the improvement of social and economic levels and the continuous development of science and technology, engineering activities have become more and more efficient and professional. However, a large amount of land development has caused serious geological damage to the land itself. In addition, the overall environmental pollution is very serious and natural disasters occur frequently, which has caused the frequent occurrence of landslides. The emergence of landslides has attracted the attention of more and more engineering construction personnel.

[0003] There are many types of geological disasters. Landslides are widely distributed and pose a huge threat. This is a problem that people urgently need to overcome and solve.

[0004] Micro steel pipe piles have the following advantages when reinforcing slopes:

[0005] 1. Low cost and good economic benefits;

[0006] 2. More powerful than ordinary anti-slip piles;

[0007] 3. The project does not require high site conditions;

[0008] 4. It has various application forms and strong adaptability;

[0009] 5. The establishment of a connecting beam at the top of the pile can create a closer relationship with the soil between the piles.

[0010] Taking into account the soft soil of some slopes, the resulting slippage generates lateral shear force and longitudinal pull-out force on the micro steel pipe piles and the concrete structure poured inside, resulting in poor stability of the steel pipe piles and poor reinforcement effect. This requires higher requirements for micro steel pipe piles. Therefore, it is necessary to develop a more stable micro steel pipe pile for slope reinforcement. Summary of the invention

[0011] In view of the deficiencies of the prior art, the present invention provides a micro steel pipe pile for slope reinforcement, which solves the problems of insufficient lateral shear force and longitudinal pull-out force and insufficient stability of the existing steel pipe piles in soft soil.

[0012] To achieve the above purpose, the present invention provides a micro steel pipe pile for slope reinforcement, the steel pipe pile comprises a lower pipe body, an upper pipe body and a cylindrical connector connecting the lower pipe body and the upper pipe body, the bottom end of the lower pipe body has a closed pointed part, and a grouting pipe is provided in the upper pipe body;

[0013] The cylindrical connecting member includes an upper flange ring, a slurry retaining cylinder body, a lower flange ring and multiple slides; the upper flange ring is fixed to the outer side of the upper port of the slurry retaining cylinder body, and the slurry retaining cylinder body is connected to the upper tube body through the upper flange ring, and the lower flange ring is parallelly sleeved outside the lower port of the slurry retaining cylinder body and connected to the lower tube body; multiple slides are distributed in a ring shape on the outer side of the slurry retaining cylinder body, and each slide includes a slidably connected side frame and a support frame, the top end of the side frame is fixedly connected to the bottom end face of the upper flange ring, the bottom end of the support frame is fixedly connected to the top end face of the lower flange ring, and the corresponding top end of the support frame is slidably connected to the bottom end of the side frame through a limiting sliding member;

[0014] The lower end of the grouting pipe is connected with the slurry retaining cylinder, and the lower end of the slurry retaining cylinder is connected with the lower pipe body. Concrete is poured toward the upper pipe body, the slurry retaining cylinder and the lower pipe body through the grouting pipe. After the concrete is injected into the lower pipe body, it moves downward, and the lower flange ring of its upper pipe mouth is separated from the slurry retaining cylinder, and a grouting gap is formed between the slurry retaining cylinder and the slurry retaining cylinder.

[0015] The better technical solution of the present invention is as follows: the grouting pipe fitting comprises an upper center tube and a lower center tube which are arranged on the inner side of the upper tube body, the upper center tube is threadedly connected to the lower center tube, a bell tube is fixedly connected to the inner side of the slurry retaining cylinder, the bottom end diameter of the bell tube is equal to the inner diameter of the slurry retaining cylinder, the diameter of the bell tube gradually shrinks from the bottom end upward, the bottom end of the lower center tube is located on the inner side of the bell tube, and a bell head is fixedly connected to the bottom end of the lower center tube, and under the limiting effect of the upper port of the bell tube, the bell head cannot move upward out of the bell tube.

[0016] A better technical solution of the present invention: the limiting sliding part includes a mounting plate, the bottom end of the mounting plate is fixedly connected to the top end of the support frame, a mating surface is arranged on the outer side of the side frame and close to the bottom end, the mounting plate corresponds to the mating surface, a threaded hole is provided on the side surface of the mating surface, and a long slot hole is provided on the side surface of the mounting plate, and a screw is passed through the long slot hole and threadedly connected to the threaded hole.

[0017] A preferred technical solution of the present invention is as follows: flange holes are provided at the ends of the upper flange ring and the lower flange ring, and screw holes are provided at the top end of the lower tube body and the bottom end of the upper tube body respectively.

[0018] A more preferred technical solution of the present invention is that the length of the lower tube body is 1 / 4-1 / 5 of the overall length of the micro steel pipe pile.

[0019] A more preferred technical solution of the present invention is that the length of the cylindrical connecting piece is 1 / 8-1 / 10 of the overall length of the micro steel pipe pile.

[0020] A preferred technical solution of the present invention is that the outer side surface of the top end of the upper central tube is polygonal.

[0021] A more preferred technical solution of the present invention is that the slides are distributed in a ring array on the outside of the slurry retaining cylinder.

[0022] The present invention also provides a construction method for micro steel pipe piles for slope reinforcement, and the specific steps are as follows:

[0023] S1. Use a pile driver to drive micro steel pipe piles for slope reinforcement into the slope. During the pile driving process, the downward pressure generated by the pile driver is transmitted to the upper flange ring through the upper tube body, and then presses the side frame downward, so that the bottom end of the side frame squeezes the support frame, and transmits the downward force to the lower flange ring, and then to the lower tube body. During this process, the upper flange ring and the lower flange ring are in a close state, and the bottom end of the slurry retaining cylinder and the top of the lower flange ring are in a closed state;

[0024] S2. After the piling is completed, concrete is poured from the top port of the upper central tube. The concrete enters the lower tube body and forms a high pressure state inside the lower tube body, further pushing the lower tube body downward and driving the lower flange ring and the support frame to move downward. At this time, the retaining cylinder body does not move, and a gap is formed between the bottom end of the retaining cylinder body and the top of the lower flange ring. The concrete flows through the gap to the outside of the cylindrical connector and forms an enlarged concrete block integrated with the cylindrical connector on the outside of the cylindrical connector;

[0025] S3. After injecting concrete into the top port of the upper central tube and maintaining the pressure for a certain period of time, push the upper central tube downward so that most of the lower central tube extends into the inner side of the cylindrical connector and the lower tube body, and inject air into the top of the upper central tube so that the concrete inside the upper central tube is basically discharged downward. After the concrete solidifies, use a mechanical clamp to remove the upper central tube;

[0026] S4, tying up the cylindrical steel skeleton, inserting the steel skeleton into the upper tube body, making the bottom end of the steel skeleton against the top of the concrete, and the exposed part of the lower center tube located on the inner side of the steel skeleton, and then continue to pour concrete, and wait for the newly poured concrete to solidify, thus completing the construction of the micro steel pipe pile for slope reinforcement of the present invention.

[0027] The present invention has the following beneficial effects:

[0028] 1. The present invention, by designing a cylindrical connecting piece, installs the lower tube body and the upper tube body together to form a micro steel pipe pile as a whole. The pointed head at the bottom end of the lower tube body is convenient for inserting into the soil during piling. After being inserted into the soil, high-pressure concrete filling (also called grouting) is carried out. During the process of filling concrete, since the bottom end of the lower tube body is in a closed state, the force will continue to move downward for a distance, and since the side frame and the support frame are sliding structures, the lower flange ring and the support frame will move downward synchronously at this time, but the upper flange ring, the side frame and the slurry retaining cylinder will not move, so that a gap is formed between the slurry retaining cylinder and the lower flange ring, and the concrete slurry inside the cylindrical connecting piece will flow outward from the gap, and finally a concrete block integrated with the cylindrical connecting piece is formed on the outside of the cylindrical connecting piece, so that the micro steel pipe pile as a whole has a better effect of resisting lateral shear force and pull-out force in the length direction, greatly improving the stability of the pile body, increasing its reinforcement effect, and making the steel pipe pile play a more excellent use effect in the slope reinforcement process.

[0029] 2. The present invention, by adding a trumpet tube and a center tube, makes it easier to complete the above-mentioned high-pressure concrete filling operation, and can ensure the integrity of the upper and lower structures of the internal concrete, making it have a more stable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A three-dimensional diagram of the micro steel pipe pile for slope reinforcement proposed by the present invention;

[0031] Figure 2 A front view of the micro steel pipe pile for slope reinforcement proposed by the present invention;

[0032] Figure 3 for Figure 2 Section view of the section line at AA;

[0033] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0034] Figure 5 This is a three-dimensional diagram of the cylindrical connector of the micro steel pipe pile for slope reinforcement proposed by the present invention.

[0035] Among them, 1. lower tube body; 2. upper tube body; 3. cylindrical connecting piece; 301. upper flange ring; 302. side frame; 303. slurry retaining tube body; 304. lower flange ring; 305. support frame; 306. mounting plate; 307. long slot hole; 308. screw; 4. pointed head; 5. upper center tube; 6. lower center tube; 601. trumpet head; 7. trumpet tube. DETAILED DESCRIPTION

[0036] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0037] The embodiment provides a micro steel pipe pile for slope reinforcement, the steel pipe pile comprises a lower tube body 1, an upper tube body 2 and a cylindrical connector 3 connecting the lower tube body 1 and the upper tube body 2, the bottom end of the lower tube body 1 has a closed pointed portion 4, and the upper tube body 2 is provided with a grouting pipe fitting; the cylindrical connector 3 comprises an upper flange ring 301, a slurry retaining cylinder 303, a lower flange ring 304 and a plurality of slides; the upper flange ring 301 is fixed to the outer side of the upper port of the slurry retaining cylinder 303, and the slurry retaining cylinder 303 is connected to the upper tube body 2 through the upper flange ring 301, the lower flange ring 304 is parallelly sleeved outside the lower port of the slurry retaining cylinder 303, and is connected to the lower tube body 1; a plurality of slides are evenly distributed in a ring shape on the outer side of the slurry retaining cylinder 303, so that it has a better stress environment. Each slide includes a slidably connected side frame 302 and a support frame 305, the top of the side frame 302 is fixedly connected to the bottom end surface of the upper flange ring 301, the bottom end of the support frame 305 is fixedly connected to the top end surface of the lower flange ring 304, and the corresponding top of the support frame 305 is slidably connected to the bottom end of the side frame 302 through a limiting sliding member; the lower end of the grouting pipe fitting is connected to the slurry retaining cylinder 303, and the lower end of the slurry retaining cylinder 303 is connected to the lower tube body 1, and concrete is poured into the upper tube body 2, the slurry retaining cylinder 303 and the lower tube body 1 through the grouting pipe fitting, and the lower tube body 1 moves downward after the concrete is injected, and the lower flange ring 304 of its upper pipe mouth is separated from the slurry retaining cylinder 303, and a grouting gap is formed between the slurry retaining cylinder 303.

[0038] During the piling process, the downward pressure generated by the pile driver is transmitted to the upper flange ring 301 through the upper tube body 2, and then presses the side frame 302 downward, so that the bottom end of the side frame 302 squeezes the support frame 305, and transmits the downward force to the lower flange ring 304, and then to the lower tube body 1. During this process, the upper flange ring 301 and the lower flange ring 304 are in a close state, and the bottom end of the slurry retaining cylinder 303 and the top of the lower flange ring 304 are in a closed state. Under this condition, the piling operation is completed. After the piling operation is completed, concrete is poured in the lower tube body 1, the cylindrical connector 3, and the upper tube body 2 to form a micro steel pipe pile.

[0039] In one embodiment, the grouting pipe fitting includes an upper center pipe 5 and a lower center pipe 6 arranged on the inner side of the upper pipe body 2, the upper center pipe 5 is threadedly connected to the lower center pipe 6, and a trumpet pipe 7 is fixedly connected to the inner side of the slurry retaining cylinder 303, and the bottom end diameter of the trumpet pipe 7 is equal to the inner diameter of the slurry retaining cylinder 303, so that the two can be connected in a closed manner, and the diameter of the trumpet pipe 7 gradually shrinks from the bottom end to the top, and a lower center pipe 6 is arranged on the inner side of the upper pipe body 2, and the bottom end of the lower center pipe 6 is located on the inner side of the trumpet pipe 7, and a trumpet head 601 is fixedly connected to the bottom end of the lower center pipe 6, and under the limiting effect of the upper port of the trumpet pipe 7, the trumpet head 601 cannot move upward out of the trumpet pipe 7, that is, the trumpet head 601 is a cylinder structure with a small upper part and a large lower part, and the bottom end diameter of the trumpet head 601 is larger than the top end diameter of the trumpet pipe 7.

[0040] The upper center tube 5 serves as a connection to facilitate the control of the lower center tube 6. The outer side surface of the top of the upper center tube 5 is a polygon to facilitate the use of a manipulator to clamp the upper center tube 5, rotate the upper center tube 5, and disassemble the upper center tube 5 from the lower center tube 6.

[0041] In one embodiment, the limiting sliding member specifically includes a mounting plate 306, the bottom end of the mounting plate 306 is fixedly connected to the top end of the support frame 305, a mating surface is provided on the outer side of the side frame 302 and close to the bottom end, the mounting plate 306 corresponds to the mating surface, a threaded hole is provided on the side of the mating surface, and a long slot hole 307 is provided on the side of the mounting plate 306, and a screw 308 is used to pass through the long slot hole 307 and then be threadedly connected to the threaded hole.

[0042] The screws 308 restrict the movement of the side frame 302 and the mounting plate 306 in directions other than the up and down directions. Since the screws 308 can slide inside the long slot hole 307, the mounting plate 306 and the mating surfaces of the side frame 302 can slide in the up and down directions.

[0043] In one embodiment, flange holes are provided at the ends of the upper flange ring 301 and the lower flange ring 304, and screw holes are provided at the top end of the lower tube body 1 and the bottom end of the upper tube body 2, so that screws can be used to fix the lower tube body 1 and the lower flange ring 304 together, and to fix the upper flange ring 301 and the upper tube body 2 together.

[0044] In one embodiment, the length of the lower tube body 1 is 1 / 4-1 / 5 of the overall length of the micro steel pipe pile, the length of the cylindrical connector 3 is 1 / 8-1 / 10 of the overall length of the micro steel pipe pile, and the concrete block formed on the outside of the cylindrical connector 3 needs to be ensured to be located below the entire micro steel pipe pile, preferably about 1 / 4 below.

[0045] The micro steel pipe pile driving construction method for slope reinforcement in the embodiment comprises the following specific steps:

[0046] S1. The micro steel pipe piles for slope reinforcement are driven into the slope by a pile driver. During the pile driving process, the downward pressure generated by the pile driver is transmitted to the upper flange ring 301 through the upper tube body, and then the side frame 302 is pressed downward, so that the bottom end of the side frame 302 squeezes the support frame 305, and the downward force is transmitted to the lower flange ring 304, and then to the lower tube body. During this process, the upper flange ring 301 and the lower flange ring 304 are in a close state, and the bottom end of the slurry retaining cylinder and the top of the lower flange ring 304 are in a closed state;

[0047] S2. The first concrete is poured from the top port of the upper central tube 5. The first concrete enters the lower tube body 1 and forms a high pressure state inside the lower tube body 1, further pushing the lower tube body 1 downward, and driving the lower flange ring 304 and the support frame 305 to move downward. Since the slurry retaining cylinder 303 does not move, a gap is formed between the bottom end of the slurry retaining cylinder 303 and the top of the lower flange ring 304 at this time, and the first concrete flows from the gap to the outside of the cylindrical connector 3;

[0048] S3. After injecting concrete into the top port of the upper central tube 5 and maintaining the pressure for a certain period of time, push the upper central tube 5 downward so that most of the lower central tube 6 extends into the inner side of the cylindrical connector 3 and the lower tube body 1, and inject air into the top of the upper central tube 5 so that the concrete inside the upper central tube 5 is basically discharged downward. After waiting for the concrete to solidify, use a mechanical clamp to remove the upper central tube 5, knock the upper central tube 5, vibrate the residual concrete inside, and keep it for one more use;

[0049] S4. Tie up the cylindrical steel skeleton and insert the steel skeleton into the upper tube body 2 so that the bottom end of the steel skeleton is against the first concrete and the exposed part of the lower center tube 6 is located on the inner side of the steel skeleton. Then pour the second concrete and wait for the second concrete to solidify. The construction of the micro steel pipe pile for slope reinforcement of the present invention is completed.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A micro steel pipe pile for slope reinforcement, characterized in that: The steel pipe pile comprises a lower pipe body (1), an upper pipe body (2) and a cylindrical connecting piece (3) connecting the lower pipe body (1) and the upper pipe body (2); the bottom end of the lower pipe body (1) has a closed pointed part (4); and a grouting pipe is provided inside the upper pipe body (2); The cylindrical connecting member (3) comprises an upper flange ring (301), a slurry retaining cylinder (303), a lower flange ring (304) and a plurality of slides; the upper flange ring (301) is fixed to the outer side of the upper port of the slurry retaining cylinder (303), and the slurry retaining cylinder (303) is connected to the upper tube (2) via the upper flange ring (301); the lower flange ring (304) is sleeved in parallel outside the lower port of the slurry retaining cylinder (303) and is connected to the lower tube (1); the plurality of slides are distributed in an annular shape on the outer side of the slurry retaining cylinder (303), and each slide comprises a slidably connected side frame (302) and a support frame (305), the top end of the side frame (302) is fixedly connected to the bottom end face of the upper flange ring (301), the bottom end of the support frame (305) is fixedly connected to the top end face of the lower flange ring (304), and the corresponding top end of the support frame (305) is slidably connected to the bottom end of the side frame (302) via a limiting sliding member; The lower end of the grouting pipe is connected to the grout retaining cylinder (303), and the lower end of the grout retaining cylinder (303) is connected to the lower pipe (1). Concrete is poured into the upper pipe (2), the grout retaining cylinder (303) and the lower pipe (1) through the grouting pipe. After the concrete is injected into the lower pipe (1), it moves downward, and the lower flange ring (304) of the upper pipe opening is separated from the grout retaining cylinder (303), forming a grouting gap between the grout retaining cylinder (303) and the grout retaining cylinder (303).

2. The micro steel pipe pile for slope reinforcement according to claim 1, characterized in that: The grouting pipe fitting comprises an upper central pipe (5) and a lower central pipe (6) which are arranged on the inner side of the upper pipe body (2); the upper central pipe (5) is threadedly connected to the lower central pipe (6); a bell pipe (7) is fixedly connected to the inner side of the slurry retaining cylinder (303); the bottom end diameter of the bell pipe (7) is equal to the inner diameter of the slurry retaining cylinder (303); the diameter of the bell pipe (7) gradually shrinks from the bottom end upward; the bottom end of the lower central pipe (6) is located on the inner side of the bell pipe (7); and a bell head (601) is fixedly connected to the bottom end of the lower central pipe (6); and under the limiting effect of the upper port of the bell pipe (7), the bell head (601) cannot move upward out of the bell pipe (7).

3. A micro steel pipe pile for slope reinforcement according to claim 1 or 2, characterized in that: The limiting sliding member comprises a mounting plate (306), the bottom end of the mounting plate (306) being fixedly connected to the top end of the support frame (305), a mating surface being arranged on the outer side of the side frame (302) and close to the bottom end, the mounting plate (306) corresponding to the mating surface, a threaded hole being arranged on the side surface of the mating surface, and a long slotted hole (307) being arranged on the side surface of the mounting plate (306), and a screw (308) being passed through the long slotted hole (307) and then being threadedly connected to the threaded hole.

4. A micro steel pipe pile for slope reinforcement according to claim 1 or 2, characterized in that: The ends of the upper flange ring (301) and the lower flange ring (304) are both provided with flange holes, and the bottom end of the upper tube body (2) and the top end of the lower tube body (1) are correspondingly provided with screw holes.

5. A micro steel pipe pile for slope reinforcement according to claim 1 or 2, characterized in that: The length of the lower tube body (1) is 1 / 4 to 1 / 5 of the overall length of the micro steel pipe pile.

6. A micro steel pipe pile for slope reinforcement according to claim 1 or 2, characterized in that: The length of the cylindrical connecting piece (3) is 1 / 8 to 1 / 10 of the overall length of the micro steel pipe pile.

7. The micro steel pipe pile for slope reinforcement according to claim 2, characterized in that: The outer side surface of the top end of the upper central tube (5) is polygonal.

8. The micro steel pipe pile for slope reinforcement according to claim 3, characterized in that: The slides are distributed in a ring array on the outside of the slurry retaining cylinder (303).

9. A construction method for the micro steel pipe pile for slope reinforcement as claimed in claim 2, characterized in that The specific steps are as follows: S1. Use a pile driver to drive micro steel pipe piles for slope reinforcement into the slope. During the pile driving process, the downward pressure generated by the pile driver is transmitted to the upper flange ring through the upper tube body, and then presses the side frame downward, so that the bottom end of the side frame squeezes the support frame, and transmits the downward force to the lower flange ring, and then to the lower tube body. During this process, the upper flange ring and the lower flange ring are in a close state, and the bottom end of the slurry retaining cylinder and the top of the lower flange ring are in a closed state; S2. After the piling is completed, concrete is poured from the top port of the upper central tube. The concrete enters the lower tube body and forms a high pressure state inside the lower tube body, further pushing the lower tube body downward and driving the lower flange ring and the support frame to move downward. At this time, the retaining cylinder body does not move, and a gap is formed between the bottom end of the retaining cylinder body and the top of the lower flange ring. The concrete flows through the gap to the outside of the cylindrical connector and forms an enlarged concrete block integrated with the cylindrical connector on the outside of the cylindrical connector; S3. After injecting concrete into the top port of the upper central tube and maintaining the pressure for a certain period of time, push the upper central tube downward so that most of the lower central tube extends into the inner side of the cylindrical connector and the lower tube body, and inject air into the top of the upper central tube so that the concrete inside the upper central tube is basically discharged downward. After the concrete solidifies, remove the upper central tube using a mechanical clamp; S4. Tie up the cylindrical steel skeleton and insert it into the upper tube body so that the bottom end of the steel skeleton is against the concrete and the exposed part of the lower center tube is located on the inner side of the steel skeleton. Then continue to pour the concrete. When the newly poured concrete solidifies, the construction of micro steel pipe piles for slope reinforcement is completed.

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