A guide device for driving soil nails

Abstract

The invention discloses a guide device for driving soil nails, comprising two channel steels (2) of the same size and specification, which are arranged at the top and the bottom and are combined with grooves facing each other, one side of which is hinged by a hinge (3) along the length direction, and the other side is connected by connecting plates (4) and locked with each other, a full-length positioning member (5) is arranged in the groove of the channel steel (2), and the positioning members (5) of the upper and lower channel steels (2) can clamp and fix the soil nail rod body (1) inserted therein after closing; two supporting rods (6) are arranged at the bottom of the lower channel steel (2), the upper end of the supporting rod (6) is hinged to the bottom of the lower channel steel (2) through a locking shaft (7), and the lower end of the supporting rod (6) is connected to a supporting plate (8) placed on the ground. The device can accurately control the angle of the driving soil nail entering the soil body, and effectively prevent the soil nail rod body from bending during construction, thereby avoiding the safety hazard caused by people holding the rod body.

Description

Technical Field

[0001] The invention relates to a guiding device for a driving soil nail, belonging to the technical field of slope support. Background Art

[0002] In slope support engineering, for soft soil or loose soil layers, such as fluidized soft soil with obvious shrinkage phenomenon and loose sandy soil with serious collapse, the effect of drilling holes and then placing rods for grouting in this layer of soil is not ideal. Driven soil nails are widely used in slope support of the above-mentioned soil layers because they do not require pre-drilling of holes, but directly drive the soil nail rod material into the soil by machine or manual, to solve the problem of difficult drilling.

[0003] At present, hollow steel pipes are generally used as the rod material for drive-in soil nails. During construction, external force is used to directly drive the rod material into the slope soil. The following problems exist in its construction: 1) The rod material has low stiffness. During the process of driving into the soil, the rod is prone to bending, and construction cannot continue, resulting in the soil nail length failing to meet the design requirements; 2) The support design requires the soil nails to enter the soil at a certain angle, but the angle at which the rod material enters the soil is difficult to control during construction, which is not conducive to the full play of the soil nail anchoring force; 3) The rod material is not effectively fixed, and it is easy to shake when hitting the rod, causing the slope surface soil to loosen or even collapse, affecting the integrity and stability of the slope soil; 4) When hitting the soil nails, the rod material is held by the workers, posing a safety hazard. Summary of the invention

[0004] In view of the above problems, the present invention provides a guiding device for a driving soil nail.

[0005] The specific technical solutions of the present invention are as follows:

[0006] The driving soil nail guide device comprises two channel steels 2 of the same size, which are arranged on the upper and lower sides and are combined with grooves facing each other. One side along the length direction is hinged by a hinge 3, and the other side is connected with a connecting plate 4 and locked with each other. A full-length positioning member 5 is arranged in the groove of the channel steel 2. When the positioning members 5 of the upper and lower channel steels 2 are closed, they can clamp and fix the soil nail rod 1 inserted therein.

[0007] Two supporting rods 6 are arranged at the bottom of the lower channel steel 2. The upper ends of the supporting rods 6 are hinged to the bottom of the lower channel steel 2 through locking shafts 7, and the lower ends of the supporting rods 6 are connected to a supporting plate 8 placed on the ground.

[0008] Furthermore, a plurality of sections of channel steel 2 are connected in series to guide and fix a long soil nail rod 1.

[0009] Furthermore, the connecting plate 4 is an outer extension of the edge of the channel steel 2, and the connecting plates 4 on the upper and lower channel steels 2 are fixedly connected by screws and nuts after being butted.

[0010] Furthermore, the center of the positioning member 5 is processed into a concave through-length semicircular groove along the length direction for clamping and fixing the cylindrical soil nail rod 1, and the inner wall radius of the semicircular groove cross section is 2 mm larger than the radius of the soil nail rod 1.

[0011] Furthermore, the center of the positioning member 5 is processed into a concave full-length rectangular groove along the length direction for clamping and fixing the rectangular or square soil nail rod body 1.

[0012] Furthermore, the support rod 6 is composed of an upper part and a lower part, and the relative position is adjusted in the middle by a positioning screw 9 to adapt to different support heights.

[0013] Furthermore, adjacent ends of the channel steels 2 connected in series are connected by a fixing plate 10 with threaded holes.

[0014] Furthermore, the support rod 6 is composed of three parallel rods, including an intermediate rod 16 and two side rods 62. The two side rods are fixedly connected together. The intermediate rod 16 can be extended or retracted between the two side rods 62, and a groove 12 is processed on one side of the intermediate rod 61. The lower end of the side rod 62 close to the groove 12 is provided with a positioning screw 9 passing through a transverse through hole at the lower end of the side rod 62. The positioning screw 9 extends to the groove 12 of the intermediate rod 61 and presses against the groove 12 to achieve the locking of the intermediate rod 61 relative to the two side rods 62, so that the support rod 6 can be adjusted in length.

[0015] When using the device specifically, the specific steps are:

[0016] 1) According to the soil nail rod body (1) parameters required by the design, determine the specifications and dimensions of the channel steel 2 used in the device, if the devices need to be used in combination, determine the required number of devices, and determine the required number of supporting members and installation positions as needed;

[0017] 2) Position and lay out the designed soil nail hole 11, place the device in front of the soil nail hole 11, place the soil nail rod 1 in the groove of the positioning member 5 of the device and lock the upper and lower channel steels 2, adjust the support rod 6 so that one end of the soil nail rod 1 is aligned with the designed soil nail hole 11, and make the angle between the device and the horizontal plane meet the designed angle;

[0018] 3) Hitting the soil nail rod 1 along the axial direction to make the soil nail rod 1 enter the slope soil;

[0019] 4) After the soil nail rod body 1 is completely driven into the device, the device is removed and the soil nail rod body 1 is continuously driven along the axial direction;

[0020] 5) If the device is used in combination, repeat step 4) and adjust the specific position of the supporting member accordingly;

[0021] 6) Until the soil nail rod 1 completely enters the slope soil.

[0022] This device has the following beneficial effects:

[0023] 1) It can provide effective lateral constraints for the soil nail rod during the soil nailing process to prevent the soil nail rod from bending, deformation or shaking;

[0024] 2) Provide guidance for the soil nail rod during the soil nailing process to ensure that the angle of the soil nail rod meets the design requirements;

[0025] 3) Workers do not need to hold the soil nail rod during the entire construction process, eliminating safety hazards;

[0026] 4) The devices can be used in combination according to the length of the soil nails, and the devices can be disassembled in sequence according to the exposed length of the soil nails during the construction process to ensure that the devices can function throughout the entire process of soil nailing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the device of the present invention;

[0028] Figure 2 Schematic diagram of the device of the present invention clamping and fixing the soil nail rod body

[0029] Figure 3 Schematic diagram of the use of the device of the present invention DETAILED DESCRIPTION

[0030] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0031] See attached Figures 1 to 3 As shown, this embodiment is a guide device for a driven soil nail with a length of 6m, a diameter of 48mm, and an angle of 15° with the horizontal plane. It is composed of three guide devices connected and combined in sequence along the length direction. Each guide device includes two No. 8 channel steels 2, which are arranged one above and one below. The grooves of the upper channel steel and the lower channel steel are combined facing each other. The soil nail rod body 1 is 6m long, and the length of the channel steel is 1.5m. The two channel steels 2 are connected by hinges 3 on one side along the length direction, and a connecting plate 4 with holes is welded on the edges of the two channel steels on the other side, which is fixed by screws and nuts to achieve locking of the device.

[0032] A through-length positioning member 5 with a semicircular cross-section groove is arranged in the groove of the two channel steels 2. The inner wall radius of the semicircular groove is 26mm. There are two support rods 6, which are hinged to the bottom surface of the lower channel steel 2 by a pin shaft 7. The support rod 6 can be pulled out of the device by pulling out the pin shaft 7. The other end of the support rod 6 is hinged to a support plate 8. The connection points of the two support rods 6 on the bottom surface of the lower channel steel 2 are all located on the symmetry line of the channel steel. The support rod 6 is composed of three parallel rods, including an intermediate rod 61 and two side rods 62. The two side rods are fixedly connected together. The intermediate rod 61 can be extended or retracted between the two side rods 62, and a groove 12 is machined on one side of the intermediate rod 61. The lower end of the side rod 62 close to the groove 12 is provided with a positioning screw 9 that passes through a horizontal through hole at the lower end of the side rod 62. The positioning screw 9 extends to the groove 12 of the intermediate rod 61 and presses against the groove 12 to achieve the position locking of the intermediate rod 61 relative to the two side rods 62, so that the support rod 6 can adjust the length.

[0033] Adjacent guide devices are connected by threaded connection combinations using fixing plates 10 with threaded holes, fixing nuts and threaded holes at the ends of the channel steels at adjacent ends of the respective channel steels.

[0034] During construction, the soil nail rod body 1 is placed in the slot of the positioning member 5 of the combined device of the present invention, and then the channel steel 2 is locked, one end of the soil nail rod body 1 is aligned with the designed hole position 11, and the support rod 6 is adjusted so that the angle between the combined device and the horizontal plane is 15°. After verification, the soil nail rod body 1 is struck along the axial direction. When the soil nail rod body 1 completely enters the combined device, a guide device is removed, and the soil nail rod body 1 is continued to be struck, and the above operation is repeated until the soil nail rod body 1 completely enters the slope soil.

Claims

1. A guiding device for a driven soil nail, characterized in that: The device comprises two pieces of channel steel (2) of the same size and specification, which are arranged at the top and the bottom and are combined with grooves facing each other, one side of which is hinged by a hinge (3), and the other side of which is connected by connecting plates (4) and locked with each other, a full-length positioning member (5) is arranged in the groove of the channel steel (2), and the positioning members (5) of the upper and lower channel steels (2) can clamp and fix the soil nail rod (1) inserted therein after being closed; Two supporting rods (6) are arranged at the bottom of the lower channel steel (2) for supporting purposes. The supporting rod (6) is composed of three parallel rods, including an upper middle rod (61) and two lower side rods (62). The two side rods are fixedly connected together. The middle rod (61) can be extended or retracted between the two side rods (62). A clamping groove (12) is processed on one side of the middle rod (61). A positioning screw (9) passing through a transverse through hole at the upper end of the side rod (62) is arranged at the upper end of the side rod (62) close to the clamping groove (12). The positioning screw (9) extends to the clamping groove (12) of the middle rod (61) and presses against the clamping groove (12) to achieve the locking of the position of the middle rod (61) relative to the two side rods (62), so that the length of the supporting rod (6) can be adjusted to adapt to different supporting heights. The upper end of the support rod (6) is hinged to the bottom of the lower channel steel (2) through a locking shaft (7), and the lower end of the support rod (6) is connected to a support plate (8) placed on the ground.

2. The guide device for driving soil nails according to claim 1, characterized in that: A plurality of sections of channel steel (2) are connected in series to guide and fix a long soil nail rod (1).

3. The guide device for driving soil nails according to claim 1, characterized in that: The connecting plate (4) is an outer extension of the edge of the channel steel (2). The connecting plates (4) on the upper and lower channel steels (2) are fixedly connected by screws and nuts after being butted against each other.

4. The guide device for driving soil nails according to claim 1, characterized in that: The center of the positioning component (5) is processed into a concave through-length semicircular groove along the length direction for clamping and fixing the cylindrical soil nail rod (1), and the radius of the inner wall of the semicircular groove cross section is 2 mm larger than the radius of the soil nail rod (1).

5. The guide device for driving soil nails according to claim 1, characterized in that: The center of the positioning component (5) is processed into a concave through-length rectangular groove along the length direction for clamping and fixing a rectangular or square soil nail rod (1).

6. The guide device for driving soil nails according to claim 2, characterized in that: Adjacent ends of the channel steels (2) connected in series are connected by a fixing plate (10) with threaded holes.

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