A spiral grouting soil nail for foundation pit support

Abstract

The utility model provides a kind of spiral grouting soil nail for foundation pit support, belong to foundation pit construction technical field, including pole body, further include: grouting pipe, fixed in the top of pole body, the outside of pole body is all set with grout outlet, positioning structure, set in the inside of pole body, wherein, positioning structure includes the connecting hinge of installation in the inside bottom end of pole body, rotationally connected in the moving rod of push arm side and the transmission assembly of setting in the top of moving rod, shielding structure, set in the outside of moving rod. In the utility model, by rotating hexagonal block to drive moving rod rotation, moving rod pushes flap to rotate and open, then flap is pressed against surrounding soil, increase the contact area and friction force of soil nail and soil, whereby realized the double anchoring function of this device, can limit pole body displacement after soil nail installation, especially in loose stratum can effectively prevent soil nail pull out, while synergic work with grouting body, can enhance soil nail pullout resistance and positional stability.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit construction technology, specifically to a spiral grouting soil nail for foundation pit support. Background Technology

[0002] Due to the problems of insufficient anchoring force and low construction efficiency of traditional soil nails under complex geological conditions, more reliable support methods are needed. Therefore, spiral grouting soil nails for foundation pit support are set up. The spiral drill bit rotates to drill into the hole and form a soil nail body with high pull-out resistance, thereby effectively limiting soil deformation and enhancing slope stability, providing a more efficient and reliable solution for foundation pit support.

[0003] Chinese patent CN209178993U discloses a spiral groutable steel pipe soil nail, comprising a main body with open ends, a head end and a tail end, the head end being a pointed tip. A circular ring plate near the tail end is fitted onto the main body and fixedly connected to it. The circular ring plate has a lower end face. A spiral plate coiled on the outer wall of the main body is fitted onto the main body, one end of which is fixedly connected to the lower end face of the circular ring, and the other end is near the head end. The maximum circumferential diameter of the spiral plate is not greater than the diameter of the circular ring plate. Grout holes are distributed on the wall of the main body located on the side of the lower end face of the circular ring. This steel pipe soil nail has a reasonable and compact structure, is easy to use and operate, has complete overall functions, and is highly practical.

[0004] The aforementioned patent still has the following shortcomings: Since the anchoring force between the soil nail and the soil mainly depends on the bonding effect of the grout, and the grout may fail to anchor due to factors such as soil deformation, the soil nail is prone to displacement or loosening in the soil when it is subjected to soil lateral pressure or external load. Especially in loose or soft soil strata, the soil nail is prone to being pulled out as a whole or shifting in position, which cannot effectively limit soil deformation, thereby reducing the stability of the foundation pit support system and increasing the risk of sidewall collapse. Utility Model Content

[0005] This utility model provides a spiral grouting soil nail for foundation pit support, which solves the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0007] An embodiment of this utility model provides a spiral grouting soil nail for foundation pit support, including a rod body, and further comprising:

[0008] Grouting pipes are fixed at the top of the rod, and grout outlets are provided on the outer side of the rod.

[0009] A positioning structure is set inside the rod body. The positioning structure includes a connecting hinge installed at the bottom of the rod body, a flap installed at the rotating end of the connecting hinge, a push arm rotating on one side of the connecting flap, a moving rod rotating on one side of the push arm, and a transmission assembly set at the top of the moving rod.

[0010] The spiral blade is fixed to the outside of the rod.

[0011] A shielding structure, located on the outside of the moving rod, is used to seal the slurry outlet.

[0012] Using the above technical solution, the rod is screwed into the soil by the guide of the conical head and the rotation of the spiral blade. After the rod is screwed to the predetermined depth, the position of the rod is initially anchored by the positioning structure. Grout is injected into the rod through the grouting pipe, and the grout flows out from the grout outlet and seeps into the gap between the soil and the rod. After solidification, it enhances the anchoring force between the soil nail and the soil.

[0013] Furthermore, a conical head is fixed to the bottom end of the rod, an installation disc is threaded to the outer side of the grouting pipe, and a plug cap is detachably installed at the top end of the grouting pipe.

[0014] The above technical solution utilizes a conical head to guide the movement of the rod, while simultaneously connecting the device to the support equipment via a mounting plate to facilitate the installation of subsequent components.

[0015] Furthermore, the positioning structure includes a threaded sleeve fixed inside the grouting pipe and threadedly connected to the moving rod, a hexagonal block fixed to the top of the moving rod, and a guide block fixed inside the conical head and slidably connected to the moving rod.

[0016] The above technical solution involves rotating the hexagonal block to drive the moving rod to rotate, which in turn pushes the flap to open. The flap then presses against the surrounding soil, increasing the contact area and friction between the soil nail and the soil. This improves the stability and pull-out resistance of the soil nail in the soil to a certain extent, preventing it from shifting or loosening under stress.

[0017] Furthermore, the outer side wall of the top of the movable rod is provided with an external thread, and the inside of the screw sleeve seat is provided with an internal thread that cooperates with the external thread.

[0018] With the above technical solution, the external thread at the top of the moving rod engages with the internal thread of the screw sleeve seat. When the hexagonal block is rotated, the screw sleeve seat rotates and drives the moving rod to move up and down, thus precisely controlling the opening and closing of the flap.

[0019] Furthermore, the flaps are symmetrically distributed along the vertical center line of the rod, and the flaps form a rotating structure with the rod via connecting hinges.

[0020] Through the above technical solution, the symmetrically distributed flaps, which rotate through the connecting hinges, can evenly press against the surrounding soil, making the force more balanced and enhancing the stability and reliability of the soil nail's positioning in the soil to a certain extent.

[0021] Furthermore, the shielding structure includes a connecting piece fixed to the outside of the moving rod, a retaining ring fixed to the outside of the connecting piece, and a guide ring fixed to the top of the retaining ring.

[0022] The above technical solution uses a retaining ring to block the grout outlet, preventing soil and debris from entering and clogging it. When the moving rod moves downward, the retaining ring is offset from the grout outlet to facilitate grouting.

[0023] Furthermore, the height of the baffle ring is greater than the diameter of the slurry outlet, and the frontal cross-section of the guide ring has an inverted funnel shape.

[0024] The above technical solution guides the grout flowing into the rod body through the inverted funnel-shaped structure of the guide ring, so that the grout can flow out from the grout outlet, ensuring the grouting effect and anchoring quality.

[0025] The above-described solution of this utility model has at least the following beneficial effects:

[0026] 1. This utility model uses a rotating hexagonal block to drive a rotating rod, which in turn pushes a flap to open. The flap then presses against the surrounding soil, increasing the contact area and friction between the soil nail and the soil. This achieves the dual anchoring function of the device, which can limit the displacement of the rod after the soil nail is installed. It can effectively prevent the soil nail from being pulled out, especially in loose strata. At the same time, when working in conjunction with the grouting body, it can enhance the pull-out resistance and positional stability of the soil nail.

[0027] 2. This utility model uses a retaining ring to block the grout outlet, preventing soil and debris from entering and clogging it. When the moving rod moves downward, the retaining ring is offset from the grout outlet to facilitate grouting. This achieves the grout outlet sealing function of the device, preventing soil particles and debris from entering the grouting channel, preventing grout outlet blockage and ensuring the smooth progress of subsequent grouting processes. Attached Figure Description

[0028] Figure 1 This is one of the structural schematic diagrams of this utility model;

[0029] Figure 2 This is the second schematic diagram of the structure of this utility model;

[0030] Figure 3 Provided by this utility model Figure 2 Enlarged cross-sectional view of a portion of point A in the middle section;

[0031] Figure 4This is a three-dimensional cross-sectional structural diagram of the locking structure provided by this utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Rod body; 2. Spiral blade; 3. Mounting plate; 4. Grouting pipe; 5. Grout outlet; 6. Positioning structure; 601. Moving rod; 602. Flip plate; 603. Connecting hinge; 604. Push arm; 605. Screw sleeve seat; 606. Hexagonal block; 607. Guide block; 7. Conical head; 8. Plug cap; 9. Shielding structure; 901. Retaining ring; 902. Flow guide ring; 903. Connecting piece. Detailed Implementation

[0034] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0035] like Figures 1 to 4 As shown, an embodiment of this utility model provides a spiral grouting soil nail for foundation pit support, including a rod body 1, and further comprising:

[0036] Grouting pipe 4 is fixed to the top of rod 1, and grout outlet 5 is provided on the outer side of rod 1.

[0037] The positioning structure 6 is set inside the rod body 1. The positioning structure 6 includes a connecting hinge 603 installed at the bottom of the rod body 1, a flap 602 installed at the rotating end of the connecting hinge 603, a push arm 604 rotatably connected to one side of the flap 602, a moving rod 601 rotatably connected to one side of the push arm 604, and a transmission assembly set at the top of the moving rod 601.

[0038] Spiral blade 2 is fixed to the outside of rod 1;

[0039] The shielding structure 9 is located on the outside of the moving rod 601 and is used to block the slurry outlet 5.

[0040] A conical head 7 is fixed at the bottom of the rod body 1, an installation plate 3 is threaded to the outside of the grouting pipe 4, and a plug 8 is detachably installed at the top of the grouting pipe 4.

[0041] In this embodiment of the utility model, before construction, the plug 8 is installed at the top of the grouting pipe 4 to prevent debris from entering. During construction, the conical head 7 is used as a guide, and with the rotation of the spiral blade 2, the rod 1 is screwed into the soil. After the predetermined depth is reached, the plug 8 is removed, and the positioning structure 6 is used to initially anchor the position of the rod 1. At the same time, the positioning structure 6 drives the shielding structure 9 to open the grout outlet 5, and grout is injected into the rod 1 through the grouting pipe 4, so that the grout flows out from the grout outlet 5 and seeps into the gap between the soil and the rod 1. After solidification, it enhances the anchoring force between the soil nail and the soil. After the grouting is completed, the device is connected to the support equipment through the installation plate 3 to facilitate the installation of subsequent components.

[0042] like Figures 1 to 4 As shown, the positioning structure 6 includes a threaded sleeve seat 605 fixed inside the grouting pipe 4 and threadedly connected to the moving rod 601, a hexagonal block 606 fixed to the top of the moving rod 601, and a guide block 607 fixed inside the conical head 7 and slidably connected to the moving rod 601. The outer side wall of the top of the moving rod 601 is provided with an external thread, and the inside of the threaded sleeve seat 605 is provided with an internal thread that cooperates with the external thread. The flaps 602 are symmetrically distributed on the vertical center line of the rod body 1, and the flaps 602 form a rotating structure with the rod body 1 through the connecting hinge 603.

[0043] In this embodiment of the invention, by using a power tool to rotate the hexagonal block 606, the moving rod 601 is driven to rotate. Since the threaded sleeve seat 605 is threadedly connected to the moving rod 601, the moving rod 601 slides downward along the threaded sleeve seat 605 through the engagement of the threads. Then, the moving rod 601 pushes the flap 602 to rotate and open around the connecting hinge 603 through the push arm 604, so that the flap 602 abuts against the surrounding soil, increasing the contact area and friction between the soil nail and the soil, which to a certain extent improves the stability and pull-out resistance of the soil nail in the soil, and prevents it from displacing or loosening when subjected to force.

[0044] like Figure 4 As shown, the shielding structure 9 includes a connecting piece 903 fixed to the outside of the moving rod 601, a retaining ring 901 fixed to the outside of the connecting piece 903, and a guide ring 902 fixed to the top of the retaining ring 901. The height of the retaining ring 901 is greater than the diameter of the slurry outlet 5, and the frontal cross-section of the guide ring 902 is an inverted funnel-shaped structure.

[0045] In this embodiment of the utility model, during the process of the soil nail being screwed into the soil, the grout outlet 5 is blocked by the retaining ring 901 to prevent soil and debris from entering and clogging the grout outlet 5. When the moving rod 601 moves downward, the moving rod 601 drives the connecting piece 903, the retaining ring 901 and the guide ring 902 to move synchronously, so that the retaining ring 901 is misaligned with the grout outlet 5 to facilitate grouting. The inverted funnel-shaped structure of the guide ring 902 guides the grout flowing into the rod body 1 so that the grout flows out from the grout outlet 5, ensuring the grouting effect and anchoring quality.

[0046] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A spiral grouting soil nail for foundation pit support, comprising a rod (1), characterized in that, Also includes: Grouting pipe (4) is fixed to the top of rod (1), and grout outlet (5) is provided on the outer side of rod (1); A positioning structure (6) is set inside the rod body (1). The positioning structure (6) includes a connecting hinge (603) installed at the bottom of the rod body (1), a flap (602) installed at the rotating end of the connecting hinge (603), a push arm (604) rotating on one side of the connecting flap (602), a moving rod (601) rotating on one side of the push arm (604), and a transmission assembly set at the top of the moving rod (601). The spiral blade (2) is fixed to the outside of the rod (1); A shielding structure (9) is set on the outside of the moving rod (601) to block the slurry outlet (5).

2. The spiral grouting soil nail for foundation pit support according to claim 1, characterized in that, The bottom end of the rod (1) is fixed with a conical head (7), the outside of the grouting pipe (4) is threaded with an installation plate (3), and the top end of the top grouting pipe (4) is detachably fitted with a plug (8).

3. The spiral grouting soil nail for foundation pit support according to claim 1, characterized in that, The positioning structure (6) includes a threaded sleeve seat (605) fixed inside the grouting pipe (4) and threadedly connected to the moving rod (601), a hexagonal block (606) fixed to the top of the moving rod (601), and a guide block (607) fixed inside the conical head (7) and slidably connected to the moving rod (601).

4. A spiral grouting soil nail for foundation pit support according to claim 3, characterized in that, The outer side wall of the top of the moving rod (601) is provided with an external thread, and the inside of the threaded sleeve seat (605) is provided with an internal thread that cooperates with the external thread.

5. A spiral grouting soil nail for foundation pit support according to claim 1, characterized in that, The flaps (602) are symmetrically distributed on the vertical center line of the rod (1), and the flaps (602) form a rotating structure with the rod (1) through the connecting hinge (603).

6. A spiral grouting soil nail for foundation pit support according to claim 1, characterized in that, The shielding structure (9) includes a connecting piece (903) fixed to the outside of the moving rod (601), a retaining ring (901) fixed to the outside of the connecting piece (903), and a guide ring (902) fixed to the top of the retaining ring (901).

7. A spiral grouting soil nail for foundation pit support according to claim 6, characterized in that, The height of the baffle ring (901) is greater than the diameter of the slurry outlet (5), and the front cross-section of the guide ring (902) is an inverted funnel shape.

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