Telescopic anchor rod for soil foundation pit slope

Abstract

The utility model relates to a telescopic anchor rod for a soil foundation pit slope. According to the telescopic anchor rod for the soil foundation pit slope, an anchor rod drill bit is installed at the front end of the anchor rod, the telescopic anchor rod comprises an inner anchor rod body and an outer anchor rod body, external threads are arranged on the outer surface of the inner anchor rod body, and the external threads are arranged on the rear section of the inner anchor rod body; internal threads are arranged on the inner surface of the outer anchor rod, the internal threads are arranged on the front section and the middle section of the outer anchor rod, and the internal threads are matched with the external threads. According to the telescopic anchor rod for the soil foundation pit side slope, the anchor rod can extend after one section of drilling, then drilling continues to be conducted on the soil foundation pit side slope, the situation that the anchor rod is connected manually, the anchor rod is carried manually, and the drilling progress is slowed down is avoided, manpower and material resources are saved, and the construction period is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt support, in particular to a telescopic bolt for the slope of a soil foundation pit. Background Technique

[0002] For a soil foundation pit, the soil on its slope is soft, so it is necessary to carry out anchoring to improve the stability of the slope; the depth of the anchoring hole is similar to the length of two bolts, and generally the traditional multi-section bolt method is used to drill the anchoring hole; since the length of a single bolt is not enough to reach the ideal depth, it is necessary to connect the bolts and then disassemble them after drilling; when drilling at multiple points, the processes of connecting, transporting and disassembling the bolts will consume a lot of time, affect the progress of drilling, and consume manpower; therefore, a bolt that does not require manual connection, transportation and disassembly is needed. Content of the Utility Model

[0003] The purpose of the utility model is to solve the above problems and provide a telescopic bolt for the slope of a soil foundation pit.

[0004] The technical solution of the utility model is: a telescopic bolt for the slope of a soil foundation pit, a bolt drill bit is installed at the front end of the bolt, the telescopic bolt includes an inner bolt and an outer bolt, an external thread is arranged on the outer surface of the inner bolt, and the external thread is arranged at the rear section of the inner bolt; an internal thread is arranged on the inner surface of the outer bolt, and the internal thread is arranged at the front section and the middle section of the outer bolt, and the internal thread cooperates with the external thread.

[0005] Preferably, several concave holes are circumferentially and uniformly distributed on the inner surface of the middle part of the front section of the outer bolt, a threaded pin block is arranged in the concave hole, and the size of the threaded pin block matches the concave hole; the threaded pin block can be completely placed inside the concave hole;

[0006] A thread communicating with the internal thread of the outer bolt is arranged at the bottom of the threaded pin block; the bottom of the threaded pin block is connected with the internal thread of the outer bolt to form a whole, which can make the cooperation of the internal thread and the external thread not affected, and the threaded pin block can be jacked up by the inner bolt.

[0007] Several notches are circumferentially and uniformly arranged on the outer surface of the rear end of the inner bolt, and the notches correspond to the threaded pin blocks one by one, and the opening of the notch is larger than the outer dimension of the threaded pin block. When the position of the threaded pin block coincides with the position of the notch, it will fall into the notch, restricting the relative movement of the inner and outer bolts, and the size of the notch is larger than the outer dimension of the threaded pin block, which can avoid the influence of the cooperation gap on the cooperation between the notch and the threaded pin block to a certain extent and cause unstable connection. The cutting surface of the bolt drill bit is higher than the upper end surface of the positioning square shaft. Avoid friction and collision between the top of the positioning square shaft and the inner wall of the anchor hole.

[0008] Further, a circular groove is formed in the middle of the top surface of the threaded pin block, and a positioning square shaft vertically extends from the center of the bottom of the circular groove. The diameter of the positioning square shaft is smaller than that of the circular groove. A through hole is correspondingly provided on the outer anchor rod, and the positioning square shaft extends out from the through hole.

[0009] The telescopic anchor rod further includes a compression spring, which is arranged in the circular groove on the top surface of the threaded pin block and is coaxial with the positioning square shaft. The upper and lower ends of the compression spring respectively abut against the outer anchor rod and the threaded pin block. Placing the compression spring inside the annular groove can press the threaded pin block after the threaded pin block enters the notch, preventing the drill from falling out due to slipping when the anchor rod rotates.

[0010] Furthermore, a pin hole is provided in the upper part of the positioning square shaft. A pin shaft can be inserted into the pin hole to lift the threaded pin block, preventing the outer anchor rod and the inner anchor rod from not being installed in place during the initial installation.

[0011] Preferably, several clamping planes are evenly arranged in a circumferential manner at the end of the outer anchor rod, and all the clamping planes are of the same size. The drilling rig clamps the outer anchor rod through the clamping planes and transmits torque, avoiding the anchor rod from falling due to the forward and reverse rotation of the drilling rig.

[0012] Furthermore, the number of the threaded pin blocks is three. The three threaded pin blocks are evenly arranged and correspond to the three notches one by one, which can simplify the structure of the device while ensuring the structural strength.

[0013] Furthermore, both the threaded pin block and the notch are square. The square contact surface can transmit the torque between the anchor rods more smoothly.

[0014] The beneficial effects of the present utility model are as follows: For the telescopic anchor rod used for the soil foundation pit slope of the present utility model, the outer anchor rod and the inner anchor rod are connected by threads. When rotating clockwise, the outer anchor rod drives the inner anchor rod to rotate together. When rotating counterclockwise, the outer anchor rod moves outward. When reaching the end of the inner anchor rod, several threaded pin blocks on the outer anchor rod enter the square notches on the outer surface of the inner anchor rod, preventing the inner anchor rod from falling off; after elongation, the outer and inner anchor rods are relatively fixed, and drilling of the slope can continue; the anchor rod can be elongated after a certain period of drilling, and then continue to drill the soil slope, avoiding the process of manually connecting and transporting the anchor rod from slowing down the drilling progress, saving manpower and material resources, and shortening the construction period. Description of the Drawings

[0015] Figure 1 is the structural schematic diagram of the telescopic anchor rod used for the soil foundation pit slope of the present utility model Figure 1 ;

[0016] Figure 2 is the structural schematic diagram of the telescopic anchor rod Figure 1 ;

[0017] Figure 3Yes Figure 2 A-A sectional view of

[0018] Figure 4 Yes Figure 2 B-B sectional view of

[0019] Figure 5 Yes Figure 3 C-C sectional view of

[0020] Figure 6 Structural schematic diagram of internal anchor bolt and threaded pin block

[0021] Figure 7 Structural schematic diagram of external anchor bolt

[0022] Figure 8 Structural schematic of telescopic anchor bolt Figure 2 ;

[0023] Figure 9 Yes Figure 8 D-D sectional view of

[0024] Figure 10 Yes Figure 9 E-E sectional view of

[0025] Figure 11 Structural schematic diagram of threaded pin block (one of them).

[0026] In the figure: 01. Soil slope, 02. Drilling rig,

[0027] 1. Telescopic anchor bolt, 10. Anchor bit, 11. Internal anchor bolt, 111. Square notch, 12. External anchor bolt, 13. Threaded pin block, 131. Pin hole, 14. Compression spring. Detailed implementation mode

[0028] Example 1: Refer to Figure 1-11 , A telescopic anchor bolt 1 for a soil foundation pit slope, an anchor bit 10 is installed at the front end of the anchor bolt, the inner diameter of the drill hole drilled by the anchor bit 10 is larger than the outer diameter of the anchor bolt, the telescopic anchor bolt 1 includes an internal anchor bolt 11 and an external anchor bolt 12, the outer surface of the internal anchor bolt 11 is provided with an external thread, and the external thread is arranged at the rear section of the internal anchor bolt 11; the inner surface of the external anchor bolt 12 is provided with an internal thread, and the internal thread is arranged at the front section and the middle section of the external anchor bolt 12, and the internal thread and the external thread cooperate with each other. The internal and external anchor bolts 12 can be telescoped through the threads.

[0029] A plurality of concave holes are circumferentially distributed on the inner surface of the middle part of the front section of the external anchor bolt 12, and a threaded pin block 13 is arranged in the concave holes, and the size of the threaded pin block 13 matches the concave holes; the threaded pin block 13 can be completely placed inside the concave holes;

[0030] The bottom of the threaded pin block 13 is provided with threads communicating with the internal threads of the external anchor rod 12; the bottom of the threaded pin block 13 is connected to the internal threads of the external anchor rod 12 to form an integral body, which can ensure that the cooperation between the internal and external threads is not affected, and the threaded pin block 13 can be lifted by the internal anchor rod 11.

[0031] A plurality of notches are circumferentially and uniformly arranged on the outer surface of the rear end of the internal anchor rod 11. The notches correspond to the threaded pin blocks 13 one by one, and the opening of the notch is larger than the outer dimension of the threaded pin block 13. When the position of the threaded pin block 13 coincides with the position of the notch, it will fall into the notch, restricting the relative movement of the internal and external anchor rods 12. Moreover, the size of the notch is larger than the outer dimension of the threaded pin block 13, which can, to a certain extent, prevent the gap in the cooperation from affecting the cooperation between the notch and the threaded pin block 13, resulting in unstable connection. The cutting surface of the anchor bit 10 is higher than the upper end surface of the positioning square shaft, avoiding frictional collision between the top of the positioning square shaft and the inner wall of the anchor hole.

[0032] A circular groove is opened in the middle of the top surface of the threaded pin block 13, and a positioning square shaft vertically extends from the center of the bottom of the circular groove. The diameter of the positioning square shaft is smaller than the diameter of the circular groove, and a through hole is correspondingly arranged on the external anchor rod 12, and the positioning square shaft extends out from the through hole.

[0033] The telescopic anchor rod 1 further includes a compression spring 14, which is concentrically arranged with the positioning square shaft in the circular groove on the top surface of the threaded pin block 13. The upper and lower ends of the compression spring 14 are respectively abutted against the external anchor rod 12 and the threaded pin block 13. Placing the compression spring 14 inside the annular groove can press the threaded pin block 13 after the threaded pin block 13 enters the notch, preventing the situation of drill bit dropping due to slipping out when the anchor rod rotates.

[0034] A pin hole 131 is arranged on the upper part of the positioning square shaft, into which a pin shaft can be inserted to lift the threaded pin block 13, preventing the external anchor rod 12 and the internal anchor rod 11 from not being installed in place during the initial installation.

[0035] A plurality of clamping planes are uniformly arranged in a circular pattern at the end of the external anchor rod 12, and all the clamping planes are of the same size. The drilling rig 02 clamps the external anchor rod 12 through the clamping planes and transmits torque, avoiding the anchor rod from dropping due to the forward and reverse rotation of the drilling rig 02.

[0036] The number of the threaded pin blocks 13 is 3. The three threaded pin blocks 13 are uniformly arranged and correspond to the three notches one by one, which can simplify the structure of the device while ensuring the structural strength.

[0037] Both the threaded pin block 13 and the notch are square. The square contact surface can transmit the torque between the anchor rods more smoothly.

[0038] The usage method of this embodiment:

[0039] ①Install the anchor bit 10 at the front end of the retracted anchor rod, connect the end of the outer anchor rod 12 to the drill 02, and remove the pin shaft in the pin hole 131;

[0040] ②Start the drill 02 to rotate the anchor rod clockwise and drill into the soil slope 01;

[0041] ③After all the anchor rods are drilled, start the drill 02 in reverse to rotate the anchor rod counterclockwise. At this time, the inner anchor rod 11 remains stationary, and the outer anchor rod 12 extends outward through the thread;

[0042] ④When the outer anchor rod 12 moves outward to the predetermined position, the threaded pin block 13 falls into the square notch 111 under the action of the compression spring 14 and is tightened;

[0043] ⑤Start the drill 02 in the forward direction, the anchor rod rotates clockwise, and the outer anchor rod 12 transmits torque to the inner anchor rod 11 and the anchor bit 10 through the cooperation of the threaded pin block 13 and the square notch 111, so that the anchor rod continues to drill forward;

[0044] ⑥After the anchor bit 10 reaches the designated position, the drilling is completed;

[0045] ⑦The drill 02 moves backward to pull out all the anchor rods;

[0046] ⑧The drill 02 moves horizontally to the next drilling position and presses the anchor bit 10 against the soil slope 01;

[0047] ⑨Pull out the three threaded pin blocks 13 and insert the pin shaft into the pin hole 131;

[0048] ⑩Start the drill 02 to rotate the anchor rod clockwise, the outer anchor rod 12 retracts inward through the thread. After complete retraction, stop the drill 02 and remove the pin shaft in the pin hole 131;

[0049] Repeat steps ② - ⑩ to drill holes in the soil slope 01.

[0050] Example 2: Example 2 is basically the same as Example 1, and the same parts will not be repeated. The differences are as follows: The telescopic anchor rod 1 further includes a middle anchor rod. The inner anchor rod 11, the middle anchor rod, and the outer anchor rod 12 are sleeved, and adjacent anchor rods are connected by threads;

[0051] The front section of the middle anchor rod is provided with a threaded pin block 13b that cooperates with the notch A of the inner anchor rod 11, and the rear section is provided with a notch B that cooperates with the threaded pin block 13a of the outer anchor rod 12. The cooperation of the three anchor rods can drill deeper anchor holes at one time and has higher adaptability.

Claims

1. A retractable anchor rod for soil foundation pit slope, wherein an anchor drill bit is installed at the front end of the anchor rod, characterized in that: The telescopic anchor rod comprises an inner anchor rod and an outer anchor rod. The outer surface of the inner anchor rod is provided with an outer thread, and the outer thread is arranged at the rear section of the inner anchor rod; the inner surface of the outer anchor rod is provided with an inner thread, and the inner thread is arranged at the front section and the middle section of the outer anchor rod, and the inner thread and the outer thread cooperate with each other.

2. The retractable anchor rod for soil foundation pit slope according to claim 1 is characterized in that: The inner surface of the middle part of the front section of the outer anchor rod is evenly distributed with several concave holes in the circumference, and a threaded pin block is arranged in the concave hole, and the size of the threaded pin block matches the concave hole; the bottom of the threaded pin block is provided with a thread connected with the internal thread of the outer anchor rod; the outer surface of the rear end of the inner anchor rod is evenly distributed with several notches in the circumference, and the notches correspond to the threaded pin blocks one by one, and the opening of the notch is larger than the outer size of the threaded pin block.

3. The retractable anchor rod for soil foundation pit slope according to claim 2 is characterized in that: A circular groove is formed in the middle of the top surface of the threaded pin block, a positioning square shaft extends vertically from the center of the bottom of the circular groove, the diameter of the positioning square shaft is smaller than the diameter of the circular groove, a through hole is correspondingly provided on the outer anchor rod, and the positioning square shaft extends from the through hole; The telescopic anchor rod also includes a compression spring, which is arranged in a circular groove on the top surface of the threaded pin block and is concentric with the positioning square shaft. The upper and lower ends of the compression spring are respectively against the outer anchor rod and the threaded pin block; the cutting surface of the anchor rod drill bit is higher than the upper end surface of the positioning square shaft.

4. The retractable anchor rod for soil foundation pit slope according to claim 3 is characterized in that: A pin hole is arranged on the upper portion of the positioning square shaft.

5. The retractable anchor rod for soil foundation pit slope according to claim 1, characterized in that: The end of the outer anchor rod is evenly circumferentially provided with a plurality of clamping planes, and the sizes of all the clamping planes are the same.

6. The retractable anchor rod for soil foundation pit slope according to claim 2, characterized in that: The number of the threaded pin blocks is 3.

7. The retractable anchor rod for soil foundation pit slope according to claim 2, characterized in that: The threaded pin block and the notch are both square.

8. The retractable anchor rod for soil foundation pit slope according to claim 1, characterized in that: The telescopic anchor rod also includes a middle anchor rod. The inner anchor rod, the middle anchor rod and the outer anchor rod are sleeved, and adjacent anchor rods are connected by threads.

9. The retractable anchor rod for soil foundation pit slope according to claim 8, characterized in that: The front section of the middle anchor rod is provided with a threaded pin block B matched with the notch A of the inner anchor rod, and the rear section is provided with a notch B matched with the threaded pin block A of the outer anchor rod.

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