Soft rock shallow covering layer lock catch steel pipe pile cofferdam guide hole structure

Abstract

The utility model provides a soft rock shallow covering layer lock catch steel pipe pile cofferdam guide hole structure which comprises two guide frames symmetrically installed on the outer sides of lock catch steel pipe piles, the opposite sides of the two guide frames are each provided with a row of limiting structures, the two rows of limiting structures correspond one by one, and each limiting structure comprises a limiting part located between the side faces of the adjacent lock catch steel pipe piles. Two attaching cambered surfaces are symmetrically arranged on the sides, close to the lock catch steel pipe piles, of the limiting parts and correspond to the outer walls of the adjacent lock catch steel pipe piles correspondingly, and the distance between the two attaching cambered surfaces meets the connecting distance between the adjacent lock catch steel pipe piles. The two rows of corresponding limiting structures are arranged on the two guide frames, every four opposite limiting structures in the two rows of limiting structures can form a lock catch steel pipe pile insertion hole, and the lock catch steel pipe piles can be limited and supported from four directions while connection between the lock catch steel pipe piles is not affected; therefore, continuous lock catch steel pipe pile limiting supporting insertion holes are formed through the two rows of limiting structures.

Description

Technical Field

[0001] The utility model relates to the field of steel pipe pile construction, in particular to a hole-leading structure for a lock-type steel pipe pile cofferdam in a soft rock shallow overburden layer. Background Technique

[0002] The construction of steel pipe pile cofferdams and hole-leading in piles can effectively solve the problem of shallow overburden layers. In areas with shallow overburden layers, it is very difficult to drive steel piles into the rock layer by traditional construction methods. By using steel pipe piles and combining with the hole-leading technology in piles, the soft soil layer can be effectively penetrated, and the steel pipe piles can be driven into the bedrock, thereby ensuring the stability and safety of the structure. After the cofferdam is closed, the accumulated water in the cofferdam can be quickly drained by pumping equipment, providing a dry working environment for subsequent foundation excavation and construction, which is conducive to improving work efficiency and construction quality. Since the steel pipe piles can be directly driven into the rock, the need to use underwater concrete to seal the bottom of the cofferdam is reduced, which not only saves material costs but also simplifies the construction process. Although the initial steel material cost is relatively high, overall good economic benefits can be achieved by improving construction efficiency, reducing material use, and lowering maintenance costs. In addition, this method can also reduce the impact on the surrounding environment and has certain social benefits.

[0003] For the construction of steel pipe pile cofferdams and hole-leading in piles, the steel pipe piles are first inserted into the preset positions, and then the holes are led in the piles by rotary drilling. Finally, the steel pipe piles are inserted to the designed positions. However, during construction, the traditional guide frame can only limit the position from the front and back sides of the steel pipe piles and cannot effectively limit the position in the left and right directions. This may cause problems such as inclination of the steel pipe piles or deformation at the joints of adjacent steel pipe piles during the processes of insertion, hole-leading, and re-insertion. At the same time, it cannot provide effective support for hole-leading, increasing the driving difficulty and even resulting in the situation where driving is impossible. Therefore, a hole-leading structure for a lock-type steel pipe pile cofferdam in a soft rock shallow overburden layer is proposed to solve the above problems. Content of the Utility Model

[0004] The main purpose of the utility model is to provide a hole-leading structure for a lock-type steel pipe pile cofferdam in a soft rock shallow overburden layer, so as to solve the problems that the traditional guide frame may cause inclination of the steel pipe piles or deformation at the joints of adjacent steel pipe piles during the processes of insertion, hole-leading, and re-insertion, and at the same time cannot provide effective support for hole-leading.

[0005] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: A guiding hole structure for a lock-biting steel pipe pile cofferdam in a soft rock shallow overburden layer, comprising two guiding frames symmetrically installed on the outer sides of the lock-biting steel pipe piles. A row of limiting structures is provided on the opposite sides of the two guiding frames, and the two rows of limiting structures correspond to each other one by one. The limiting structure includes a limiting portion located between the sides of adjacent lock-biting steel pipe piles. On one side of the limiting portion close to the lock-biting steel pipe pile, two fitting arc surfaces are symmetrically provided, corresponding to the outer walls of adjacent lock-biting steel pipe piles respectively, and the distance between the two fitting arc surfaces satisfies the connection distance between adjacent lock-biting steel pipe piles. Four opposite limiting structures can clamp the lock-biting steel pipe piles therein.

[0006] In a preferred embodiment, two guiding slopes are symmetrically provided at the top of the limiting portion and are respectively connected to the two fitting arc surfaces.

[0007] In a preferred embodiment, the guiding frame includes a cross plate and a vertical plate provided at the end of the cross plate. Two L-shaped connecting pieces are symmetrically provided on the back of the limiting portion and are hooked on the vertical plate.

[0008] In a preferred embodiment, the L-shaped connecting piece is located above the limiting portion, and a stiffening plate is provided at the angle between the L-shaped connecting piece at the bottom and the limiting portion.

[0009] In a preferred embodiment, the L-shaped connecting piece is fixed to the vertical plate by bolts, and a locking nut is threadedly sleeved on the penetrating end thereof. Perforations for the bolts to pass through are provided on the vertical plate and the L-shaped connecting piece.

[0010] In a preferred embodiment, a plurality of balls that are rotatably provided on the fitting arc surface and are in contact with the lock-biting steel pipe pile are provided.

[0011] The present utility model provides a guiding hole structure for a lock-biting steel pipe pile cofferdam in a soft rock shallow overburden layer. By providing two rows of corresponding limiting structures on two guiding frames, every four opposite limiting structures in the two rows of limiting structures can form an insertion hole for the lock-biting steel pipe pile. It can limit and support the lock-biting steel pipe pile from four directions without affecting the connection between the lock-biting steel pipe piles, so as to form a continuous limiting support insertion hole for the lock-biting steel pipe pile by using the two rows of limiting structures, effectively avoiding the problems of inclination or deformation at the connection of adjacent steel pipes during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0013] Figure 1 is the overall structure diagram of the present utility model;

[0014] Figure 2 is the structure diagram of the guiding frame of the present utility model;

[0015] Figure 3 is the top view of the connection structure of the lock-biting steel pipe pile, the guiding frame and the limiting structure of the present utility model;

[0016] Figure 4 It is the structural diagram of the limit structure of the present utility model;

[0017] Figure 5 It is the present utility model Figure 4 Another perspective view of the structure;

[0018] In the figure: guide frame 1; horizontal plate 101; vertical plate 102; perforation 103; limit structure 2; limit part 201; fitting arc surface 202; guiding slope surface 203; L-shaped connecting piece 204; ball 205; bolt 206; locking nut 207; stiffening plate 208; locked steel pipe pile 3. Specific embodiments

[0019] As Figures 1-5 shown, a hole-leading structure for a locked steel pipe pile cofferdam in a soft rock shallow overburden layer includes two guide frames 1 symmetrically installed on the outer sides of the locked steel pipe piles 3. The guide frames 1 are specifically installed on the steel pipe pile construction groove steel frames preset on the drilling steel platform, which is prior art in the field of steel pipe pile cofferdam construction, so no detailed description will be given here. A row of limit structures 2 are arranged on the opposite sides of the two guide frames 1, and the two rows of limit structures 2 correspond one by one. The limit structure 2 includes a limit part 201 located between the sides of adjacent locked steel pipe piles 3. On one side of the limit part 201 close to the locked steel pipe pile 3, two fitting arc surfaces 202 are symmetrically arranged, corresponding to the outer walls of adjacent locked steel pipe piles 3 respectively, and the distance between the two fitting arc surfaces 202 meets the connection distance between adjacent locked steel pipe piles 3. The four opposite limit structures 2 can clamp the locked steel pipe pile 3 therein. By arranging on the fitting arc surfaces 202, it is convenient for the locked steel pipe pile 3 to pass through between the four limit structures 2, so as to use the four limit structures 2 to limit it in four directions, thereby meeting the limit support requirements during insertion and hole leading. In addition, the limit structures 2 arranged on the sides of adjacent locked steel pipe piles 3 can effectively avoid interfering with the connection between adjacent locked steel pipe piles 3.

[0020] In a preferred solution, two guiding slope surfaces 203 respectively connected to the two fitting arc surfaces 202 are symmetrically arranged at the top of the limit part 201. The included angle between the fitting arc surface 202 and the guiding slope surface 203 is 120° - 150°. In this embodiment, preferably 135°. Through the guiding slope surface 203, when the locked steel pipe pile 3 is inserted into the four limit structures 2, it can play a role of sliding guidance for its bottom end, reducing the insertion difficulty.

[0021] In a preferred embodiment, the guide frame 1 includes a horizontal plate 101 and a vertical plate 102 provided at the end of the horizontal plate 101. The cross-sections of the horizontal plate 101 and the vertical plate 102 are in the shape of an inverted T. Two L-shaped connectors 204 that are hooked on the vertical plate 102 are symmetrically provided on the back surface of the limiting portion 201. The connection between the limiting portion 201 and the vertical plate 102 through the L-shaped connectors 204 can effectively improve its own installation strength.

[0022] In a preferred embodiment, the L-shaped connector 204 is located above the limiting portion 201. A stiffening plate 208 is provided at the angle between the L-shaped connector 204 at the bottom and the limiting portion 201. In this embodiment, the number of the stiffening plates 208 is two. By providing the stiffening plates 208, the structural strength of the limiting structure 2 can be effectively enhanced, ensuring the limiting support strength during insertion and pilot hole drilling.

[0023] In a preferred embodiment, the L-shaped connector 204 is fixed to the vertical plate 102 by bolts 206. The number of the bolts 206 is not less than two. A locking nut 207 is threadedly sleeved on the through end thereof. Through holes 103 for the bolts 206 to pass through are provided on the vertical plate 102 and the L-shaped connector 204. By fixing the limiting structure 2 with bolts, while being detachable and replaceable, the installation difficulty is reduced.

[0024] In a preferred embodiment, a plurality of balls 205 that are in contact with the lock-up steel pipe pile 3 are rotatably provided on the fitting arc surface 202. The balls 205 are arranged in a row on the fitting arc surface 202. The friction during insertion with the fitting arc surface 202 can be effectively reduced by the balls 205.

[0025] The specific construction method includes: inserting the lock-up steel pipe pile 3 into the corresponding four limiting structures 2. First, use a hydraulic vibratory hammer to drive the lock-up steel pipe pile 3 to a preset position, then use a rotary drilling rig to conduct in-pipe pilot hole drilling, and finally use a percussion hammer to follow up the lock-up steel pipe pile 3 to the designed pile bottom position. Among them, a "body-opening bit" is used for drilling in the silt layer of the in-pipe pilot hole, a "sand fishing bit" is used for the sand layer, and a "rock barrel drill" is used for the rock layer.

[0026] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations to the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A soft rock shallow overburden locking steel pipe pile cofferdam hole guide structure, characterized by: The invention comprises two guide frames (1) symmetrically mounted on the outside of locking steel pipe piles (3), a row of limiting structures (2) are arranged on opposite sides of the two guide frames (1), the two rows of limiting structures (2) correspond to each other, the limiting structures (2) comprise limiting parts (201) located between the side surfaces of adjacent locking steel pipe piles (3), two fitting arc surfaces (202) are symmetrically arranged on one side of the limiting parts (201) close to the locking steel pipe piles (3), respectively corresponding to the outer walls of adjacent locking steel pipe piles (3), and the distance between the two fitting arc surfaces (202) satisfies the connection distance between adjacent locking steel pipe piles (3), and the four relative limiting structures (2) can clamp the locking steel pipe piles (3) therein.

2. According to claim 1, a soft rock shallow overburden locking steel pipe pile cofferdam hole guide structure is characterized by: Two guide slope surfaces (203) respectively connected to the two fitting cambered surfaces (202) are symmetrically arranged at the top end of the limiting portion (201).

3. According to claim 1, a soft rock shallow overburden locking steel pipe pile cofferdam hole guide structure is characterized by: The guide frame (1) comprises a transverse plate (101) and a vertical plate (102) arranged at the end of the transverse plate (101), and two L-shaped connecting pieces (204) hooked on the vertical plate (102) are symmetrically arranged on the back side of the limiting portion (201).

4. According to claim 3, a soft rock shallow overburden locking steel pipe pile cofferdam hole guide structure is characterized by: The L-shaped connecting piece (204) is located above the limiting portion (201), and a stiffening plate (208) is provided at the angle between the L-shaped connecting piece (204) and the limiting portion (201) at the bottom.

5. According to claim 3, a soft rock shallow overburden locking steel pipe pile cofferdam hole guide structure is characterized by: The L-shaped connecting piece (204) is fixed to the vertical plate (102) by means of bolts (206), and a locking nut (207) is threadedly sleeved on the through end thereof. The vertical plate (102) and the L-shaped connecting piece (204) are provided with through holes (103) for the bolts (206) to pass through.

6. According to claim 3, a soft rock shallow overburden locking steel pipe pile cofferdam hole guide structure is characterized by: A plurality of rolling balls (205) which fit with the locking steel pipe piles (3) are rotatably arranged on the fitting cambered surface (202).

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