Flexible wall protection pile bottom expansion device suitable for karst area

Abstract

The application provides a flexible retaining wall pile bottom expansion device suitable for karst areas, which comprises a sleeve ring and a plurality of pushing boxes; the top of the sleeve ring is provided with an annular groove; the outer wall of the sleeve ring is provided with a rim; the inside of the pushing box is provided with a gear rotating shaft and an elastic member; the side plate of the pushing box is further provided with a rotating groove; the arc-shaped clamping plate of the pushing box is slidingly limited in the annular groove; the upper and lower ends of the gear rotating shaft are both provided with rotating gears; the middle part of the gear rotating shaft is connected with a pushing column; the rotating gears are respectively engaged with the gear rim; and the two ends of the elastic member are respectively connected to the gear rotating shaft and the inner wall of the pushing box. The beneficial effects of the application are as follows: the elastic member of the expansion device can drive the gear rotating shaft in the pushing box to rotate, so that the pushing column on the gear rotating shaft rotates, the end of the pushing column abuts against the flexible cloth bag, the flexible cloth bag is expanded outward, the situation that the mud or concrete leaks laterally along the gap on the side of the pile in the process of pouring concrete is avoided, and the pile forming quality in the karst area is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction devices, in particular to a flexible retaining wall pile bottom expansion device suitable for karst areas. BACKGROUND

[0002] There are caves and cracks of different sizes in karst ground, and the caves are often accompanied by complex underground water flow, which brings great challenges to pile foundation forming, especially in the concrete pouring process. Due to the existence of caves or cracks, mud or concrete often leaks along the cracks, resulting in engineering problems such as failure to form piles or excessive leakage of mud.

[0003] At present, the steel casing following method is the most mature pile foundation forming method in karst areas, but the cost of steel casing is very high, especially when encountering a cave of ten meters high, the cost of steel casing is as high as tens of thousands of yuan, and the steel casing cannot be recycled after pile forming, so the cost of pile forming increases significantly. In order to improve the cost problem of steel casing, high-performance geomembrane, geotextile or plastic products are gradually used in engineering to replace steel casing. Although the cost of flexible casing has been significantly reduced, due to its small elastic modulus, a concrete leakage channel is often opened between the flexible casing and the rock wall during the process of concrete flowing and turning up at the pile bottom, resulting in significant leakage of mud at the pile bottom. Therefore, there is an urgent need for a device that can actively expand and expand the flexible casing to fit the rock wall to provide reliable sealing effect after the steel reinforcement cage is lowered into the flexible casing and before the pile foundation is poured. SUMMARY

[0004] Therefore, the present application provides a flexible retaining wall pile bottom expansion device suitable for karst areas, characterized in that it comprises a sleeve ring and a plurality of push boxes.

[0005] The sleeve ring comprises a sleeve ring inner ring and a sleeve ring outer ring, which are coaxially arranged and fixedly connected, and an annular groove is formed between the sleeve ring inner ring and the sleeve ring outer ring. The outer wall of the sleeve ring outer ring is provided with two gear rings, and the two gear rings are arranged opposite to each other.

[0006] Each push box is internally provided with a gear rotating shaft and an elastic member, the inner side of the push box is provided with an arc-shaped clamping plate, and the side plate of the push box is further provided with a rotating groove extending from the outer side to the side connected with the outer side. The arc-shaped clamping plate is slidingly limited in the annular groove.

[0007] The upper and lower ends of the gear rotating shaft are provided with rotating gears, and the middle part of the gear rotating shaft is connected with a pushing column, and the two rotating gears are meshed with the two gear rings, respectively. One end of the elastic member is connected to the gear rotating shaft, and the other end is connected to the inner wall of the push box. The elastic member is in a compressed or stretched state, and the pushing column is limited in the sliding rotating groove.

[0008] Further, the number of the push boxes is eight, and the eight push boxes are evenly distributed around the ring.

[0009] Further, the inner wall of the push box is further provided with two arc-shaped racks, and the two gears and the two arc-shaped racks are respectively engaged.

[0010] Further, the elastic member is a spiral spring.

[0011] Further, the push box is further provided with a limiting member, and the limiting member is used to limit the rotation of the gear.

[0012] Further, the push box is further provided with a first limiting hole, the gear ring on the outer wall of the ring is further provided with a second limiting hole, the limiting member is a limiting rod, and the limiting rod passes through the first limiting hole and the second limiting hole at the same time to limit the rotation of the push box relative to the ring.

[0013] Further, the outer side of the ring is further provided with a flexible cloth bag, and all the push boxes are located in the flexible cloth bag.

[0014] Further, the outer side of the ring is further provided with a flexible cloth bag, and all the push boxes are located in the flexible cloth bag.

[0015] Further, a limiting clamping groove is further arranged between the arc-shaped clamping plate and the push box, and the outer ring of the ring is limited in the limiting clamping groove.

[0016] Further, the inner wall of the inner ring of the ring is welded on the steel cage of the flexible retaining pile.

[0017] Further, the inner ring and the outer ring of the ring have the same height, and the bottom of the inner ring and the outer ring is connected through an annular bottom plate, and the height of the arc-shaped clamping plate is half of the height of the outer ring of the ring.

[0018] The beneficial effects of the flexible retaining wall pile bottom expansion device suitable for karst areas are as follows: the flexible retaining wall pile bottom expansion device comprises a sleeve ring and a plurality of pushing boxes; the sleeve ring comprises a sleeve ring inner ring and a sleeve ring outer ring, and an annular groove is formed between the sleeve ring inner ring and the sleeve ring outer ring; the outer wall of the sleeve ring outer ring is provided with two gear rings; each pushing box is internally provided with a gear rotating shaft and an elastic member; the inner side of the pushing box is provided with an arc-shaped clamping plate; the side plate of the pushing box is further provided with a rotating groove extending from the outer side to the side connected with the outer side; the arc-shaped clamping plate is slidingly limited in the annular groove; the upper and lower ends of the gear rotating shaft are respectively provided with rotating gears, and the middle part of the gear rotating shaft is connected with a pushing column; the two rotating gears are respectively engaged with the two gear rings; the two ends of the elastic member are respectively connected to the gear rotating shaft and the inner wall of the pushing box; the elastic member is in a compressed or stretched state; and the pushing column is limited in the rotating groove. After the elastic member of the expansion device is released from the limitation of the pushing box, the pushing box and the gear rotating shaft in the pushing box can be driven to rotate, so that the pushing column on the gear rotating shaft rotates in the rotating groove, and then the end of the pushing column abuts against the flexible cloth bag to expand the flexible cloth bag outward, thereby achieving the active expansion of the pile diameter in the pile foundation construction process, avoiding the leakage of mud or concrete along the side gap of the pile in the process of pouring concrete, ensuring the pile quality in the karst area, and further reducing the pile foundation construction cost in the karst area. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 FIG. 1 is a perspective view of the main structure of the flexible retaining wall pile bottom expansion device suitable for karst areas according to an embodiment of the present application.

[0020] Fig. 2 FIG. 2 is a perspective view of the sleeve ring of the flexible retaining wall pile bottom expansion device suitable for karst areas according to an embodiment of the present application.

[0021] Fig. 3 FIG. 3 is a top view of the internal structure of the pushing box of the flexible retaining wall pile bottom expansion device suitable for karst areas according to an embodiment of the present application (the connection structure of the elastic member and the gear rotating shaft is not shown).

[0022] In the above figures: 1 is a sleeve ring inner ring, 2 is a sleeve ring outer ring, 3 is an annular groove, 4 is a gear ring, 5 is a pushing box, 51 is a rotating groove, 52 is an arc-shaped rack, 53 is an arc-shaped clamping plate, 6 is a gear rotating shaft, 61 is a rotating gear, 7 is a pushing column, 8 is an elastic member, and 9 is a limiting rod. DETAILED DESCRIPTION

[0023] To make the purpose, technical scheme and advantages of the present application clearer, the embodiments of the present application will be further described below with reference to the drawings.

[0024] Please refer to Figs. 1 to 3The application discloses a flexible retaining wall pile bottom expansion device suitable for karst areas.

[0025] The sleeve ring is a double-layer sleeve body, and comprises a sleeve ring inner ring 1 and a sleeve ring outer ring 2, which are coaxially arranged and fixedly connected, and an annular groove 3 is formed between the sleeve ring inner ring 1 and the sleeve ring outer ring 2; the outer wall of the sleeve ring outer ring 2 is provided with two gear rings 4, and the two gear rings 4 are oppositely arranged.

[0026] Each of the jacking boxes is internally provided with a gear rotating shaft 6 and an elastic member 8, the inner side of the jacking box is provided with an arc-shaped clamping plate 53, and the arc-shaped clamping plate 53 is fixedly connected with the jacking box. The arc of the arc-shaped clamping plate 53 is the same as the arc of the annular groove 3, and the thickness of the arc-shaped clamping plate 53 is slightly smaller than the width of the annular groove 3, so that the arc-shaped clamping plate can be slidably limited in the annular groove 3.

[0027] The side plate of the jacking box 5 is further provided with a rotating groove 51 extending from the outer side to the side connected with the outer side, in the embodiment, the rotating groove 51 extends from the outer side to the right side; the gear rotating shaft 6 is provided with rotating gears 61 at the upper end and the lower end, the two rotating gears 61 on the gear rotating shaft 6 are respectively engaged with the two gear rings 4 on the sleeve ring outer ring 2, the gear rotating shaft 6 is connected with a jacking column 7 at the middle part, one end of the jacking column 7 is fixedly connected with the gear rotating shaft 6, the other end of the jacking column 7 extends to the outside of the jacking box 5 through the rotating groove 51, and the gear rotating shaft 6 can be slidably limited in the rotating groove 51, one end of the elastic member 8 is connected with the gear rotating shaft 6, and the other end of the elastic member 8 is connected with the inner wall of the jacking box, the elastic member 8 is in a compressed or stretched state, and the jacking column 7 is limited in the rotating groove 51. Fig. 3 The jacking box is further provided with a limiting member, and the limiting member is used for limiting the rotation of the rotating gear 61. The outer side of the sleeve ring is further provided with an annular flexible cloth bag (the flexible cloth bag is not shown in the figure), and all the jacking boxes are located in the flexible cloth bag.

[0028] When the expansion device is used, the inner wall of the sleeve ring inner ring 1 is welded on the reinforcement cage of the flexible retaining wall pile, when the reinforcement cage is lowered to the bottom, the limiting members on the jacking boxes are pulled out, after the limiting members of the jacking boxes are removed, the elastic member 8 can drive the jacking box and the gear rotating shaft 6 in the jacking box to rotate, so that the jacking column 7 on the gear rotating shaft 6 rotates in the rotating groove 51, and then the end of the jacking column 7 abuts against the flexible cloth bag, the flexible cloth bag is expanded outward, the pile diameter is actively expanded in the pile construction process, the leakage of mud or concrete along the pile side gap in the process of pouring concrete is avoided, the pile quality in the karst area is ensured, and the pile foundation construction cost in the karst area is further reduced.

[0029] In the preferred embodiment, the number of the push boxes is eight, and the eight push boxes are evenly distributed around the ring.

[0030] In the preferred embodiment, the inner wall of the push box is further provided with two arc-shaped racks 52, and the two rotating gears 61 and the two arc-shaped racks 52 are engaged with each other, so that the rotating gears 61 above the gear rotating shaft 6 are arranged between the gear ring and the arc-shaped rack 52, thereby ensuring the stability of the rotating gears 61 and the gear rotating shaft 6 during movement.

[0031] In the preferred embodiment, the elastic member 8 is a spiral spring, which is used to provide power for the rotation of the gear rotating shaft 6.

[0032] In the preferred embodiment, the limiting member is a limiting rod 9, the top of the push box is further provided with a first limiting hole, the root of the gear ring 4 on the upper wall of the outer ring 2 of the ring is further provided with a second limiting hole, the first limiting hole and the second limiting hole are aligned with each other, and the limiting rod 9 passes through the first limiting hole and the second limiting hole at the same time to limit the rotation of the push box relative to the ring. The limiting rod 9 can be pulled out of the first limiting hole and the second limiting hole, and when the limiting rod 9 is pulled out of the first limiting hole and the second limiting hole, the rotation limitation between the push box and the ring is released.

[0033] In the preferred embodiment, the arc-shaped clamping plate 53 and the side plate of the push box are further provided with a limiting clamping groove, and the outer ring of the ring is located in the limiting clamping groove, so that the ring and the push box form a structure of mutual engagement, thereby ensuring the stability of the sliding connection between the ring and the push box.

[0034] In the preferred embodiment, the inner ring 1 and the outer ring 2 of the ring have the same height, and the bottom of the inner ring 1 and the outer ring 2 is connected by a ring-shaped bottom plate, so that the annular groove 3 has a structure of open upper end and closed lower end, and the inner ring 1, the outer ring 2 and the ring-shaped bottom plate are an integrated structure. The height of the arc-shaped clamping plate 53 is half of the height of the outer ring of the ring, and the arc-shaped clamping plate 53 is slidably clamped in the annular groove 3 from the upper end opening of the annular groove 3.

[0035] In this document, the front, back, up, down and other orientation words are defined according to the position of the parts in the drawing and the position of the parts relative to each other, only for the purpose of expressing the technical scheme clearly and conveniently. It should be understood that the use of the orientation words should not limit the scope of the application claimed.

[0036] In the case of no conflict, the above-mentioned embodiments and the features in the embodiments can be combined with each other.

[0037] The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A flexible retaining wall pile bottom expansion device suitable for karst areas, characterized in that, The device comprises a collar and a plurality of push boxes. The collar comprises a collar inner ring and a collar outer ring, which are coaxially arranged and fixedly connected, and an annular groove is formed between the collar inner ring and the collar outer ring; the outer wall of the collar outer ring is provided with two gear rings, which are arranged oppositely above and below. Each of the push boxes is internally provided with a gear rotating shaft and an elastic member, the inner side of the push box is provided with an arc-shaped clamping plate, and the side plate of the push box is further provided with a rotating groove extending from the outer side to the side connected with the outer side; the arc-shaped clamping plate is slidingly limited in the annular groove. The upper and lower ends of the gear rotating shaft are both provided with rotating gears, and the middle part of the gear rotating shaft is connected with a push column, the two rotating gears are respectively engaged with the two gear rings, one end of the elastic member is connected to the gear rotating shaft, and the other end is connected to the inner wall of the push box, the elastic member is in a compressed or stretched state, and the push column is limited in the sliding rotating groove.

2. The flexible retaining wall pile bottom expansion device suitable for karst areas according to claim 1, characterized in that, The number of the push boxes is eight, and the eight push boxes are uniformly arranged around the collar.

3. The flexible sheet pile bottom expander device suitable for karst areas according to claim 1, characterized in that, The inner wall of the push box is further provided with two arc-shaped racks, and the two rotating gears and the two arc-shaped racks are respectively engaged.

4. The flexible sheet pile wall bottom expansion device for karst area according to claim 1, characterized in that, The elastic member is a spiral spring.

5. The flexible sheet pile wall bottom expansion device for karst area according to claim 1, characterized in that, The push box is further provided with a limiting member for limiting the rotation of the rotating gear.

6. The flexible sheet pile wall bottom expansion device for karst area according to claim 5, characterized in that, The push box is further provided with a first limiting hole, and the gear ring of the outer wall of the collar is further provided with a second limiting hole, the limiting member is a limiting rod, and the limiting rod passes through the first limiting hole and the second limiting hole at the same time to limit the rotation of the push box relative to the collar.

7. The flexible sheet pile wall bottom expansion device for karst area according to claim 1, characterized in that, The outer side of the collar is further provided with a flexible cloth bag, and all the push boxes are located in the flexible cloth bag.

8. The flexible sheet pile wall bottom expansion device for karst area according to claim 1, characterized in that, The arc-shaped clamping plate and the push box are further provided with a limiting clamping groove, and the collar outer ring is limited in the limiting clamping groove.

9. The flexible sheet pile wall bottom expansion device for karst area according to claim 1, characterized in that, The inner wall of the collar inner ring is welded on the steel reinforcement cage of the flexible retaining wall pile.

10. The flexible sheet pile wall bottom expansion device for karst area according to claim 1, characterized in that, The collar inner ring and the collar outer ring have the same height, and the bottom parts of the collar inner ring and the collar outer ring are connected through an annular bottom plate, and the height of the arc-shaped clamping plate is half of the height of the collar outer ring.

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