Anti-settling structure at junction of soft soil subgrade and normal subgrade

Abstract

The utility model belongs to the roadbed anti -settlement technical field, concretely is a kind of soft soil roadbed and normal roadbed junction anti -settlement structure, including soft soil roadbed and normal roadbed, and soft soil roadbed and normal roadbed are placed with brick; The upper side of the brick is perforated with alignment hole, and the inner side of the alignment hole is inserted with anchor rod;The anchor rod includes rod body, the lower end of rod body is perforated with center rod and is equipped with the collar, the outer side of center rod is fixed with the collar, and the outer side of collar is hinged with open-close baffle;The outer side of center rod is slidably sleeved with taper head, the outer side of taper head is sleeved with limit ring, the outer side of limit ring is hinged with connecting rod, and the other end of connecting rod is hinged with open-close baffle;The device is provided with the open-close baffle that can be unfolded in the end of anchor rod inserted into underground, and open-close baffle is closed before inserting anchor rod, so that the insertion of anchor rod can be facilitated;After anchor rod is inserted into anchor rod hole, the limit ring can be unfolded by pulling open-close baffle by connecting rod by the mutual distancing of center rod and taper head.

Description

Technical Field

[0001] This utility model relates to the field of roadbed settlement prevention technology, specifically a settlement prevention structure at the junction of soft soil roadbed and normal roadbed. Background Technology

[0002] The roadbed is a strip-shaped structure built according to the route location and technical requirements. As the foundation of the pavement structure, it mainly bears traffic loads. If the roadbed settles, it will not only reduce the smoothness and safety of driving, but also affect the stability of the road structure. Therefore, anti-settlement design is crucial.

[0003] Settlement is prone to occur at the junction of soft soil subgrade and normal subgrade. Existing anti-settlement structures require the installation of anchor bolts underground and grouting for fixation. However, if the grouting pressure is too high, the anchor bolts are easily squeezed out along the grout flow direction, making it impossible to fix them in the set position. In severe cases, they may even be squeezed out of the anchor bolt holes. In addition, after the grout seeps into the soft soil subgrade, it will cause the anchor bolt holes to shift towards the soft soil subgrade side, thus failing to effectively restrain the anchor bolts and causing excessive inclination angle.

[0004] Therefore, we propose an anti-settlement structure at the junction of soft soil subgrade and normal subgrade to solve the problems of anchor rods being easily squeezed out and tilting towards the soft soil subgrade. Utility Model Content

[0005] The purpose of this utility model is to provide an anti-settlement structure at the junction of soft soil subgrade and normal subgrade, so as to solve the problems mentioned in the background art, such as anchor rods being easily squeezed out of the anchor rod hole and anchor rods easily tilting towards the soft soil subgrade side.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a settlement prevention structure at the junction of soft soil subgrade and normal subgrade, comprising a soft soil subgrade and a normal subgrade, with a square brick placed between the soft soil subgrade and the normal subgrade; an alignment hole is provided through the top of the square brick, and an anchor rod is inserted into the inner side of the alignment hole; The anchor rod includes a rod body, the lower end of which passes through an alignment hole and is provided with a central rod. A collar is fixed on the outside of the central rod, and an opening and closing baffle is hinged to the outside of the collar. A cone head is slidably sleeved on the outside of the central rod, and a limiting ring is sleeved on the outside of the cone head. A connecting rod is hinged to the outside of the limiting ring, and the other end of the connecting rod is hinged to the opening and closing baffle. The outer side of the central rod is provided with a positioning hole, and two positioning posts are symmetrically arranged on the inner side of the positioning hole. A thrust spring is provided between the two positioning posts, and the inner cavity of the cone head is provided with a limiting hole corresponding to the positioning post.

[0007] Preferably, the square brick has a reinforcing hole through it in the horizontal direction, and a reinforcing steel bar is inserted into the inside of the reinforcing hole. The two ends of the reinforcing steel bar extending out of the square brick are respectively buried in the soft soil subgrade and the normal subgrade.

[0008] Preferably, the reinforcing steel bar is U-shaped, with a U-shaped end and an open end at each end, and the U-shaped end is embedded in the soft soil subgrade. Preferably, a guide groove is provided on the inner side of the cone head, and a guide block adapted to the guide groove is provided on the outer side of the central rod.

[0009] Preferably, the inner side of the cone head is provided with a limiting groove that communicates with the guide groove, and the limiting groove is adapted to the guide block; the lower end of the limiting groove is provided with an arc-shaped sliding surface, and the lower side of the guide block is provided with an arc-shaped surface corresponding to the arc-shaped sliding surface.

[0010] Preferably, an anti-movement spring is placed on the inner bottom of the cone head, and when the guide block is located inside the limiting slot, the lower end of the center rod abuts against the anti-movement spring.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1) This device has an expandable baffle at the end of the anchor rod that is inserted into the ground. The baffle is closed before the anchor rod is inserted, which facilitates the insertion of the anchor rod. After the anchor rod is inserted into the anchor rod hole, the separation between the central rod and the cone head allows the limiting ring to be pulled open by the connecting rod. When the baffle is opened, it can be locked in the anchor rod hole. At this time, even if the grout has a tendency to push the anchor rod upward, it will not be able to move upward because the opened baffle is locked in the anchor rod hole, thus ensuring the stability of the anchor rod position.

[0012] 2) This device has square bricks on the outside of the anchor rod. The alignment holes of the square bricks limit the tilt angle of the anchor rod, ensuring that the tilt angle of the anchor rod will not be too large. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the structure of this utility model embedded under the road surface; Figure 2 This is a schematic diagram of the square brick structure of this utility model; Figure 3 This utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 4 This is an exploded view of the central rod and opening / closing baffle of this utility model; Figure 5 This is a schematic diagram of the positioning column structure of this utility model; Figure 6 This is a schematic diagram of the cross-sectional structure of the cone head of this utility model.

[0014] In the diagram: 1. Road surface, 2. Soft soil subgrade, 3. Normal subgrade, 4. Underground, 5. Square bricks, 6. Anchor bolts, 7. Reinforcing steel bars; 611 Rod body, 612 Center rod; 621 Opening and closing baffle, 622 Connecting rod, 623 Collar, 624 Reinforcing plate, 625 Limiting ring; 631 Positioning post, 632 Anti-detachment ring, 633 Thrust spring; 64 Guide block; 651 Cone head, 652 Limiting hole, 653 Guide groove, 654 Limiting slot, 655 Arc-shaped sliding surface; 66 Anti-movement spring. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] Example: Please see Figure 1-6 This utility model provides a technical solution: a settlement prevention structure at the junction of soft soil subgrade and normal subgrade, comprising square bricks 5, anchor bolts 6, and reinforcing steel bars 7 filling the space between the soft soil subgrade 2 and the normal subgrade 3. First, a trench is excavated between the soft soil subgrade 2 and the normal subgrade 3. Then, anchor bolt holes are drilled at the bottom of the trench, extending 4 into the ground. The anchor bolt holes are T-shaped, with a larger diameter hole at the lower end and a smaller diameter hole at the upper end. Subsequently, the anchor bolts 6 are inserted into the anchor bolt holes, and grout is injected into the anchor bolt holes for fixation.

[0018] A alignment hole is drilled through the top of the brick 5. After grouting, the brick 5 is aligned with the anchor rod 6 through the alignment hole and placed on the outside of the anchor rod 6. The number of bricks 5 can be stacked as needed, so that the upper surfaces of the soft soil subgrade 2, normal subgrade 3 and the uppermost brick 5 are as flush as possible. If the upper surface of the uppermost brick 5 is lower than the soft soil subgrade 2 and normal subgrade 3, a sand and gravel cushion layer can be filled on the upper side of the uppermost brick 5. The upper side of the uppermost brick 5 should not be higher than the upper surface of the soft soil subgrade 2 and normal subgrade 3. When the bricks 5 are stacked, the upper surface of the uppermost brick 5 is higher than the upper surface of the anchor rod 6, and the upper end of the anchor rod 6 extends into the alignment hole of the uppermost brick 5.

[0019] The square brick 5 has a reinforcing hole drilled through it laterally, and a reinforcing steel bar 7 is inserted into the inside of the hole. When excavating the trench, transverse trenches are also excavated in the soft soil subgrade 2 and the normal subgrade 3 to facilitate the insertion of the reinforcing steel bar 7; alternatively, a transverse trench can be excavated only in the soft soil subgrade 2, and then one end of the reinforcing steel bar 7 is inserted through the square brick 5 and fixed into the normal subgrade 3 within the transverse trench of the soft soil subgrade 2; subsequently, the transverse trench is filled, leaving the other end of the reinforcing steel bar 7 in the soft soil subgrade 2. The reinforcing steel bar 7 is U-shaped, with a U-shaped end and an open end at each end. The open end facilitates insertion into the subgrade; therefore, after the open end of the reinforcing steel bar 7 is fixed into the normal subgrade 3, the U-shaped end is buried in the soft soil subgrade 2. The U-shaped end can better distribute the load, reducing the possibility of settlement in the soft soil subgrade 2 above it.

[0020] Subsequently, concrete is filled into the trench between the soft soil subgrade 2 and the normal subgrade 3, as well as into the alignment holes of the square bricks 5, to fix the reinforcing steel bars 7, square bricks 5, and anchor bolts 6 together; finally, the road surface is laid on top of the soft soil subgrade 2, the normal subgrade 3, and the square bricks 5. The separate installation of the reinforcing steel bars 7, square bricks 5, and anchor bolts 6 facilitates transportation.

[0021] Anchor bolt 6 includes a rod body 611, a portion of which is inserted into an alignment hole. The lower end of the rod body 611 passes through the alignment hole and extends into the anchor bolt hole in the underground 4. An integrally formed central rod 612 is provided at the lower end of the rod body 611. A collar 623 and a reinforcing plate 624 are sleeved on the outer side of the central rod 612. The reinforcing plate 624 can be welded to the collar 623 or fixedly connected by bolts. When the reinforcing plate 624 is welded to the collar 623, the reinforcing plate 624 is also welded to the rod body 611, and the collar 623 is also welded to the rod body 611. When the reinforcing plate 624 and the collar 623 are fixedly connected by bolts, a threaded hole is provided on the rod body 611, and through holes are provided on the collar 623 and the reinforcing plate 624. The bolts pass through the reinforcing plate 624 and the collar 623 and are screwed to the rod body 611. A reinforcing rod is provided on the reinforcing plate 624, and a reinforcing groove corresponding to the reinforcing rod is provided on the collar 623. The collar 623 is then reinforced by the reinforcing plate 624 to prevent it from shaking. An opening and closing baffle 621 is hinged to the outside of the collar 623, and an avoidance groove adapted to the opening and closing baffle 621 is provided on the outside of the rod body 611. The opening and closing baffle 621 can be rotated into the avoidance groove, thereby reducing the space occupied during transportation.

[0022] One end of the cone head 651 has a cavity corresponding to the central rod 612, and the central rod 612 is inserted into the cavity and can slide up and down. A limiting ring 625 is sleeved on the outside of the cone head 651, and a connecting rod 622 is hinged to the outside of the limiting ring 625. The other end of the connecting rod 622 is hinged to the opening and closing baffle 621. When the central rod 612 slides away from the cone head 651, the distance between the limiting ring 625 and the collar 623 increases. The collar 623 pulls the opening and closing baffle 621 to rotate and unfold through the connecting rod 622. The size of the opening and closing baffle 621 after unfolding is larger than the diameter of the small diameter hole of the anchor bolt hole. Therefore, after unfolding, the opening and closing baffle 621 can be stuck at the junction of the large and small holes of the anchor bolt hole, thereby preventing the anchor bolt 6 from being squeezed out of the anchor bolt hole.

[0023] A positioning hole is laterally opened on the outer side of the center rod 612. Two positioning posts 631 are symmetrically arranged on the inner side of the positioning hole. The positioning posts 631 are T-shaped, with a larger diameter at the end closer to each other and a smaller diameter at the end further away. An anti-detachment ring 632 is also provided inside the positioning hole. The anti-detachment ring 632 is fitted onto the smaller diameter end of the positioning post 631, with its outer end interference-fitted with the positioning hole to prevent it from falling out. The inner side of the anti-detachment ring 632 is clearance-fitted with the positioning post 631 to facilitate sliding. The anti-detachment ring 632 prevents the positioning post 631 from popping out of the positioning hole. A thrust spring 633 is provided between the two positioning posts 631. The thrust spring 633 pushes the two positioning posts 631 away from each other, thereby causing the ends of the two positioning posts 631 that are further away from each other to extend out of the positioning hole. The inner cavity of the cone head 651 has a limiting hole 652. As the center rod 612 moves upward, when the positioning pin 631 is aligned with the limiting hole 652, the thrust spring 633 will push the positioning pin 631 into the limiting hole 652, and the center rod 612 will be fixed and unable to move; at this time, the opening and closing baffle 621 is fully opened.

[0024] The inner side of the cone head 651 is provided with a guide groove 653, and the outer side of the center rod 612 is provided with a guide block 64 that is adapted to the guide groove 653; through the cooperation of the guide block 64 and the guide groove 653, relative rotation between the center rod 612 and the cone head 651 is avoided.

[0025] During use, it is necessary to prevent the opening and closing baffle 621 from automatically unfolding. Therefore, a limiting groove 654 is opened on the inner side of the cone head 651. Under normal conditions, the guide block 64 is set in the limiting groove 654. The lower end of the limiting groove 654 is connected to the guide groove 653, so that the guide block 64 in the limiting groove 654 can rotate into the guide groove 653. The limiting ring 625 is rotatably connected to the cone head 651 to ensure that the central rod 612 can normally drive the guide block 64 to rotate. A sliding groove is opened on the outer side of the cone head 651, so that the limiting ring 625 can slide up and down a short distance, thereby facilitating the push of the guide block 64 to slide down and disengage from the limiting groove 654. The lower end of the limiting slot 654 is provided with an arc-shaped sliding surface 655, and the lower side of the guide block 64 is provided with an arc-shaped surface corresponding to the arc-shaped sliding surface 655. When the guide block 64 in the limiting slot 654 slides down, the arc-shaped surface fits with the arc-shaped sliding surface 655, forcing the guide block 64 to automatically rotate towards the guide groove 653, thereby facilitating its entry into the guide groove 653.

[0026] An anti-movement spring 66 is placed on the inner bottom of the cone head 651. The anti-movement spring 66 stores elastic potential energy. When the guide block 64 is located inside the limiting slot 654, the lower end of the center rod 612 abuts against the anti-movement spring 66. The thrust of the anti-movement spring 66 causes the center rod 612 to tend to move away from the cone head 651, thereby preventing the guide block 64 from disengaging from the limiting slot 654.

[0027] Working principle: The end of the anchor rod 6 with the cone head 651 is inserted into the anchor rod hole. When the cone head 651 contacts the lower end of the anchor rod hole, force is applied downwards. At this time, the lower end of the cone head 651 slowly penetrates into the ground. At the same time, the rod body 611 drives the central rod 612 to overcome the resistance of the anti-movement spring 66 and move closer to the bottom wall of the inner cavity of the cone head 651. Meanwhile, the central rod 612 drives the guide block 64 to disengage from the limiting slot 654. Under the guidance of the arc-shaped sliding surface 655 and the arc-shaped surface, the guide block 64 rotates towards the guide groove 653. Finally, the guide block 64 enters the guide groove 653.

[0028] When the anchor rod 6 can no longer move downwards (because the ground is hard, the anchor rod 6 can only be inserted into the soil a short distance), the rod body 611 is pulled upwards. The rod body 611 drives the guide block 64 to slide upwards in the guide groove 653 through the central rod 612. At this time, the elastic force of the anti-movement spring 66 and the resistance of the soil to the cone head 651 will prevent the cone head 651 from moving synchronously. That is, as the rod body 611 moves upwards, the relative distance between the rod body 611 and the cone head 651 increases. The collar 623 on the outside of the central rod 612 pulls the limiting ring 625 upwards through the opening and closing baffle 621 and the connecting rod 622. When the limiting ring 625 touches the upper wall of the outer sliding groove of the cone head 651, the limiting ring 625 stops moving upwards. At this time, as the collar 623 continues to move upwards, the connecting rod 622 pulls the opening and closing baffle 621 to unfold.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model, and no reference numerals in the claims should be considered as limiting the scope of the claims.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A settlement prevention structure at the junction of a soft soil subgrade and a normal subgrade, comprising a soft soil subgrade (2) and a normal subgrade (3), wherein square bricks (5) are placed between the soft soil subgrade (2) and the normal subgrade (3); characterized in that: A alignment hole is provided through the top of the square brick (5), and an anchor rod (6) is inserted into the inner side of the alignment hole. The anchor rod (6) includes a rod body (611), the lower end of the rod body (611) passes through an alignment hole and is provided with a central rod (612), a collar (623) is fixed on the outside of the central rod (612), and an opening and closing baffle (621) is hinged on the outside of the collar (623); a cone head (651) is slidably sleeved on the outside of the central rod (612), a limiting ring (625) is sleeved on the outside of the cone head (651), a connecting rod (622) is hinged on the outside of the limiting ring (625), and the other end of the connecting rod (622) is hinged to the opening and closing baffle (621); The center rod (612) has a positioning hole on its outer side, and two positioning posts (631) are symmetrically arranged on the inner side of the positioning hole. A thrust spring (633) is arranged between the two positioning posts (631). The inner cavity of the cone (651) has a limiting hole (652) corresponding to the positioning post (631).

2. The anti-settlement structure at the junction of soft soil subgrade and normal subgrade according to claim 1, characterized in that: The square brick (5) has a reinforcing hole through it in the horizontal direction. A reinforcing steel bar (7) is inserted into the inside of the reinforcing hole. The two ends of the reinforcing steel bar (7) extending out of the square brick (5) are respectively buried in the soft soil subgrade (2) and the normal subgrade (3).

3. The anti-settlement structure at the junction of soft soil subgrade and normal subgrade according to claim 2, characterized in that: The reinforcing steel bar (7) is U-shaped, with the two ends of the reinforcing steel bar (7) being the U-shaped end and the open end, respectively, and the U-shaped end is buried in the soft soil subgrade (2).

4. The anti-settlement structure at the junction of soft soil subgrade and normal subgrade according to claim 1, characterized in that: The inner side of the cone (651) is provided with a guide groove (653), and the outer side of the center rod (612) is provided with a guide block (64) that is adapted to the guide groove (653).

5. The anti-settlement structure at the junction of soft soil subgrade and normal subgrade according to claim 4, characterized in that: The inner side of the cone (651) is provided with a limiting groove (654) that communicates with the guide groove (653), and the limiting groove (654) is adapted to the guide block (64); the lower end of the limiting groove (654) is provided with an arc-shaped sliding surface (655), and the lower side of the guide block (64) is provided with an arc-shaped surface corresponding to the arc-shaped sliding surface (655).

6. The anti-settlement structure at the junction of soft soil subgrade and normal subgrade according to claim 5, characterized in that: An anti-movement spring (66) is placed on the inner bottom of the cone (651). When the guide block (64) is located inside the limiting slot (654), the lower end of the center rod (612) abuts against the anti-movement spring (66).

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