CN108360514B - Rotary extrusion double-layer nested dish-shaped enlarged footing anchor rod and use method thereof - Google Patents

Abstract

The invention provides a rotary extrusion double-layer nested disc-shaped enlarged footing anchor rod and a use method thereof. The invention is composed of an anchor rod main shaft, a disc-shaped enlarged head sleeve, an extrusion plastic expansion pipe and a rotary extrusion outer sleeve. After the anchor rod main shaft is arranged at a preset position, the anchor rod main shaft is sleeved into the disc-shaped enlarged footing sleeve, the disc-shaped enlarged footing sleeve is impacted and expanded by rotating and extruding the outer sleeve to form an expanded anchoring end, the anchor rod main shaft is fixed in a soil body or a rock body to form anti-pulling anchoring force, and the expanded disc-shaped enlarged footing sleeve is locked by extruding the plastic expansion pipe to prevent anchoring from loosening. The invention strengthens the connection between the soil bodies by a physical method, enhances the sliding resistance of the side slope, avoids the accidents of soil body sliding, collapse and the like caused by excavation of the side slope of the foundation pit, and improves the stability of the foundation pit. The construction efficiency is improved, and grouting materials are saved. The invention can be used for foundation pit excavation supporting engineering and improves the safety and stability of the foundation pit side slope. The device has the advantages of simple and convenient instrument operation and high construction efficiency.

Description

A kind of rotary extruded double-layer nested dish-shaped enlarged head anchor rod and using method thereof

technical field

The invention relates to a rotary extruded double-layer nested dish-shaped enlarged head anchor rod and a method of using the same. The invention is composed of an anchor rod main shaft, a dish-shaped expansion head sleeve, an extruded plastic expansion tube and a rotary extruded outer sleeve. After setting the anchor rod main shaft to a predetermined position, insert the dish-shaped expansion head sleeve, and use the rotary extrusion outer sleeve to impact and expand the dish-shaped expansion head sleeve to form an enlarged anchoring end and fix the anchor rod main shaft. In the soil or rock mass, the anti-pulling anchoring force is formed, and then the expanded dish-shaped expansion head sleeve is locked by the extruded plastic expansion tube to prevent the anchoring from loosening, enhance the anti-slip force of the slope, and avoid the Accidents such as soil sliding and collapse caused by the excavation of the pit slope have improved the stability of the foundation pit. Aiming at the foundation pit excavation and support engineering, the invention improves the traditional grouting anchoring method, greatly improves the construction efficiency, and saves grouting materials. The invention belongs to the related technical fields of geotechnical engineering, environmental engineering and the like.

Background technique

With the development of cities, urban land is becoming more and more scarce, and the utilization of urban underground space is increasing. Among the methods of developing urban underground space, trenchless engineering has high technical requirements and high cost. Therefore, foundation pit excavation is currently the most commonly used method for developing underground space. However, the soil properties in many areas are poor, which brings difficulties to the construction, and the stability of the slope in the excavation of the foundation pit is very important. There are various forms of foundation pit excavation and support, such as grading and excavation, excavation of external pulling anchors and retaining wall piles, underground diaphragm wall plus anchor rod, slope protection pile plus anchor rod, stirring pile support and reverse construction. Among them, anchor pipe support has the advantages of small footprint, large construction space in the foundation pit, and fast construction speed, so it is widely used in foundation pit excavation and support projects. The anchoring method of anchor pipe support is generally grouting anchoring. There are two difficulties in grouting anchoring. One is that the fullness of the grouting cannot be reliably guaranteed. In order to solve these two problems, the present invention proposes a new bolt anchoring method, which adopts the method of extrusion and expansion for anchoring.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose a rotary extruded double-layer nested dish-shaped enlarged head anchor rod and a method of using the same. After setting the anchor rod main shaft to a predetermined position, insert the dish-shaped expansion head sleeve, and use the rotary extrusion outer sleeve to impact and expand the dish-shaped expansion head sleeve to form an enlarged anchoring end and fix the anchor rod main shaft. In the soil or rock mass, the anti-pulling anchoring force is formed, and then the expanded dish-shaped expansion head sleeve is locked by the extruded plastic expansion tube to prevent the anchoring from loosening, enhance the anti-slip force of the slope, and avoid the Accidents such as soil sliding and collapse caused by the excavation of the pit slope have improved the stability of the foundation pit. Mainly used for foundation pit excavation and support engineering.

Solution of the present invention

The invention proposes a rotary extruded double-layer nested dish-shaped expansion head anchor rod, the overall structure of which includes four parts: the anchor rod main shaft, the disk-shaped expansion head sleeve, the extrusion plastic expansion tube, and the rotary extrusion outer sleeve. .

The main shaft of the anchor rod is a solid round rod-shaped rod, and the diameter of the end is slightly larger than that of the rear part to prevent the sleeve of the dish-shaped expansion head from sliding out of the anchor rod. Squeeze the outer sleeve to squeeze and expand the dish-shaped expansion head sleeve, and then fix it;

The dish-shaped expansion head sleeve is a metal cylinder with an axial slit on the surface, and a circular groove is opened on the inner wall of the middle of the cylinder. The outer part is extruded and expanded to form a disc-shaped expansion head, which is inserted into the surrounding soil or rock mass to form an anchoring force;

The extruded plastic expansion tube is a flexible and easily deformable plastic tube. After the anchoring of the dish-shaped expansion head sleeve is completed, it is sleeved on the main shaft of the anchor rod. relaxation;

The rotary extrusion outer sleeve is a metal cylindrical structure, which is sleeved outside the main shaft of the anchor rod, and the disk-shaped expansion head sleeve is rotated and extruded. After the disk-shaped expansion head is formed, the rotary extrusion outer sleeve is used to rotate and extrude the plastic The expansion tube fixes the dish-shaped expansion head sleeve, and the rotary extrusion outer sleeve has screw threads inside.

As mentioned above, a method of using a rotary extruded double-layer nested dish-shaped expansion head anchor rod:

1) Excavate the foundation pit, level the construction site, measure and locate the place where the anchor pipe needs to be laid in the foundation pit, and mark the drilling position;

2) Before drilling, adjust the angle of the drilling machine, use the place marked by the bolt machine to drill, and start the drilling machine until the drilling reaches the predetermined depth;

3) After drilling, clear the hole and set the anchor shaft to the predetermined position;

4) Use the rotary extrusion outer sleeve to push the dish-shaped expansion head sleeve into the anchoring position with the rotary extrusion outer sleeve, and rotate along the thread to extrude and expand the dish-shaped expansion head sleeve to the outside. After completion, pull out the outer sleeve by rotating and extruding;

5) Use the rotating extrusion outer sleeve to send the extruded plastic expansion tube into the threaded section of the anchor shaft, and rotate and extrude, so that the extruded plastic expansion tube is in close contact with the disk-shaped expansion head sleeve, and the plastic to be extruded After the contact and fixation of the expansion pipe is completed, the outer sleeve is pulled out and rotated to extrude to complete the anchoring construction of an anchor rod.

Advantages of the present invention

The invention proposes a rotary extruded double-layer nested dish-shaped enlarged head anchor rod and its use method. After setting the anchor rod main shaft to a predetermined position, insert the dish-shaped expansion head sleeve, and use the rotary extrusion outer sleeve to impact and expand the dish-shaped expansion head sleeve to form an enlarged anchoring end and fix the anchor rod main shaft. In the soil or rock mass, the anti-pulling anchoring force is formed, and then the expanded dish-shaped expansion head sleeve is locked by the extruded plastic expansion tube to prevent the anchoring from loosening, enhance the anti-slip force of the slope, and avoid the Accidents such as soil sliding and collapse caused by the excavation of the pit slope have improved the stability of the foundation pit. The invention has the advantages of simple operation, high construction efficiency and good benefits.

Description of drawings

Figure 1 is a schematic diagram of the main shaft of the anchor

Accompanying drawing 2 is the schematic diagram of dish-shaped expansion head sleeve

Accompanying drawing 3 is the schematic diagram of dish-shaped expansion head sleeve after expansion

Figure 4 is a schematic diagram of an extruded plastic expansion tube

Accompanying drawing 5 is the schematic diagram of rotary extrusion outer sleeve

In the picture: 1. Anchor main shaft, 2. Thread, 3. Disc-shaped expansion head sleeve, 4. Extruding plastic expansion tube, 5. Rotating and extruding the outer sleeve.

Detailed ways:

The invention proposes a rotary extruded double-layer nested dish-shaped expansion head anchor rod, the overall structure of which includes four parts: the anchor rod main shaft, the disk-shaped expansion head sleeve, the extrusion plastic expansion tube, and the rotary extrusion outer sleeve. .

The anchor shaft 1 in the structure is a solid round rod-shaped rod, the diameter of the end is slightly larger than that of the rear, to prevent the dish-shaped expansion head sleeve 3 from sliding out of the anchor rod, and on the anchor rod where the dish-shaped expansion head sleeve 3 is placed There are threads 2, and the outer sleeve 5 can be squeezed and expanded by rotating and extruding the outer sleeve 5, and then fixed;

The disk-shaped expansion head sleeve 3 in the structure is a metal cylinder with an axial slit on the surface, and a circular groove is opened on the inner wall of the middle of the cylinder. When the two ends of the disk-shaped expansion head sleeve 3 are squeezed It is extruded and expanded from the circular groove to form a disc-shaped expansion head, which is inserted into the surrounding soil or rock mass to form an anchoring force;

The extruded plastic expansion tube 4 in the structure is a flexible and easily deformable plastic tube. After the anchoring of the dish-shaped expansion head sleeve 3 is completed, it is sleeved on the main shaft 1 of the anchor rod, and the outer sleeve 5 is squeezed and deformed to seal the anchor. Rod hole to prevent anchoring force from loosening;

The rotary extrusion outer sleeve 5 in the structure is a metal cylinder structure, which is sleeved outside the bolt main shaft 1, and the disk-shaped expansion head sleeve 3 is rotated and extruded. The cylinder 5 rotates and squeezes the plastic expansion tube 4 to fix the dish-shaped expansion head sleeve 3 , and the outer sleeve 5 for rotation and extrusion has a screw thread inside.

As mentioned above, a method of using a rotary extruded double-layer nested dish-shaped expansion head anchor rod:

1) Excavate the foundation pit, level the construction site, measure and locate the place where the anchor pipe needs to be laid in the foundation pit, and mark the drilling position;

2) Before drilling, adjust the angle of the drilling machine, use the place marked by the bolt machine to drill, and start the drilling machine until the drilling reaches the predetermined depth;

3) After drilling, clear the hole, and set the anchor shaft 1 to the predetermined position;

4), use the rotary extrusion outer sleeve 5 to push the dish-shaped expansion head sleeve 3 into the anchoring position with the rotary extrusion outer sleeve 5, and rotate along the thread 2 to extrude the dish-shaped expansion head sleeve 3 outward. After the expansion is completed, pull out the rotary extrusion outer sleeve 5;

5), use the rotary extrusion outer sleeve 5 to send the extruded plastic expansion tube 4 into the thread 2 section of the anchor shaft 1, and rotate and extrude, so that the extruded plastic expansion tube 4 and the dish-shaped expansion head sleeve 3 are tightly After the contact and fixation of the extruded plastic expansion tube 4 is completed, the outer sleeve 5 for rotation and extrusion is pulled out to complete the anchoring construction of an anchor rod.

Claims (2)

1. A rotary extruded double-layer nested dish-shaped expansion head anchor rod, the overall structure of which includes 4 parts: the anchor rod main shaft, the disk-shaped expansion head sleeve, the extrusion plastic expansion tube, and the rotary extrusion outer sleeve, Its characteristics are: The main shaft of the anchor rod is a solid round rod-shaped rod, and the diameter of the end part is slightly larger than that of the rear part to prevent the sleeve of the dish-shaped expansion head from sliding out of the anchor rod. The disk-shaped expansion head sleeve can be extruded and expanded by extruding the outer sleeve with rotation, and then fixed; The dish-shaped expansion head sleeve is a metal cylinder with an axial slit on the surface, and a circular groove is opened on the inner wall of the middle of the cylinder; The extruded plastic expansion tube is a flexible and easily deformable plastic tube. After the anchoring of the dish-shaped expansion head sleeve is completed, it is sleeved on the main shaft of the anchor rod. Anchoring force relaxation; The rotary extrusion outer sleeve is a metal cylinder structure, which is sleeved outside the main shaft of the anchor rod, and the disk-shaped expansion head sleeve is rotated and extruded. The compression plastic expansion tube fixes the dish-shaped expansion head sleeve, and the rotary extrusion outer sleeve has screw threads inside. 2. the using method of a kind of rotary extrusion double-layer nested dish-shaped expansion head anchor rod according to claim 1: 1) Excavate the foundation pit, level the construction site, measure and locate the place where the anchor pipe needs to be laid in the foundation pit, and mark the drilling position; 2) Before drilling, adjust the angle of the drilling machine, use the place marked by the bolt machine to drill, and start the drilling machine until the drilling reaches the predetermined depth; 3) After drilling, clear the hole and set the anchor shaft to the predetermined position; 4) Use the rotary extrusion outer sleeve to push the dish-shaped expansion head sleeve into the anchoring position, and rotate along the thread to extrude and expand the dish-shaped expansion head sleeve outward. After the expansion is completed, pull out the rotary extrusion outer sleeve; 5) Use the rotating extrusion outer sleeve to send the extruded plastic expansion tube into the threaded section of the anchor shaft, and rotate and extrude, so that the extruded plastic expansion tube is in close contact with the disk-shaped expansion head sleeve, and the plastic to be extruded After the contact and fixation of the expansion pipe is completed, the outer sleeve is pulled out and rotated to extrude to complete the anchoring construction of an anchor rod.

Images