Flexible dado pile bottom expansion device suitable for karst area

Abstract

The invention provides a flexible wall protection pile bottom expansion device suitable for a karst area. The flexible wall protection pile bottom expansion device comprises a lantern ring and a plurality of pushing boxes. Annular grooves are formed in the tops of the lantern rings; a wheel rim is arranged on the outer wall of the lantern ring, a gear rotating shaft and an elastic piece are arranged in the pushing box, a rotating groove is further formed in a side plate of the pushing box, and the arc-shaped clamping plate of the pushing box is limited in the annular groove in a sliding mode; the middle of the gear rotating shaft is connected with a pushing column, the rotating gears are meshed with the gear rings respectively, and the two ends of the elastic piece are connected to the gear rotating shaft and the inner wall of the pushing box respectively. The expansion device has the beneficial effects that the elastic piece 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 expands outwards, the situation that slurry or concrete leaks in the side direction of a pile side gap in the concrete pouring process is avoided, and the service life of the pile side gap is prolonged. And the pile forming quality of the karst area is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of building construction devices, in particular to a flexible wall protection pile bottom expansion device suitable for karst areas. Background Art

[0002] There are caves and cracks of varying sizes in karst foundations, and the caves are often accompanied by complex groundwater flows, which poses a huge challenge to the formation of pile foundations. Especially during 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 the inability to form piles or excessive leakage.

[0003] At present, the steel casing follow-up method is the most mature pile foundation method in karst areas, but the cost of steel casing is very high, especially when encountering a karst cave with a height of more than ten meters. The cost of steel casing is as high as hundreds of thousands of RMB, and the steel casing can basically not be recovered after the pile is formed, and the cost of pile formation has increased significantly. In order to improve the cost problem of steel casing, flexible casing made of high-performance geomembranes, geotextiles or plastic products are gradually used to replace steel casing in current projects. Although the cost of flexible casing has been significantly reduced, due to its small elastic modulus, a concrete leakage channel is often opened up between the flexible casing and the rock wall during the flow and upward flipping of concrete at the bottom of the pile, resulting in significant leakage at the bottom of the pile. Therefore, there is an urgent need for a device that can actively unfold and expand the flexible casing after lowering the steel cage covered with the flexible casing and before pouring the pile foundation to make it fit with the rock wall to provide a reliable sealing effect; Summary of the invention

[0004] In view of this, the present invention provides a flexible wall protection pile bottom expansion device suitable for karst areas, characterized in that it includes a collar and a plurality of jacking boxes;

[0005] The collar comprises an inner collar and an outer collar, the inner collar and the outer collar are coaxially arranged and fixedly connected, and an annular groove is formed between the inner collar and the outer collar; the outer wall of the outer collar is provided with two gear rings, and the two gear rings are arranged relatively up and down;

[0006] Each of the push boxes is provided with a gear rotating shaft and an elastic member, an arc-shaped clamping plate is provided on the inner side of the push box, and a rotating groove is provided on the side plate of the push box, and the rotating groove extends from the outer side to the side connected to the outer side; the arc-shaped clamping plate is slidably limited in the annular groove;

[0007] Rotating gears are provided at the upper and lower ends of the gear rotating shaft, and a push column is connected to the middle of the gear rotating shaft. 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 to slide in the rotating groove.

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

[0009] Furthermore, the inner wall of the push box is also provided with two arc-shaped racks, and the two gears and the two arc-shaped racks are respectively meshed.

[0010] Furthermore, the elastic member is a coil spring.

[0011] Furthermore, a limiter is provided on the push box, and the limiter is used to limit the rotation of the gear.

[0012] Furthermore, a first limiting hole is provided on the push box, and a second limiting hole is provided on the gear ring on the outer wall of the collar. 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.

[0013] Furthermore, a flexible cloth bag is provided on the outer side of the collar, and all the push boxes are located in the flexible cloth bag.

[0014] Furthermore, a flexible cloth bag is provided on the outer side of the collar, and all the push boxes are located in the flexible cloth bag.

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

[0016] Furthermore, the inner wall of the inner ring of the collar is welded to the steel cage of the flexible wall protection pile.

[0017] Furthermore, the inner ring of the collar and the outer ring of the collar have the same height, and the bottoms of the inner ring of the collar and the outer ring of the collar are connected via an annular bottom plate, and the height of the arc-shaped clamping plate is half of the height of the outer ring of the collar.

[0018] The beneficial effects of the flexible wall protection pile bottom expansion device suitable for karst areas of the present invention are as follows: the flexible wall protection pile bottom expansion device comprises a collar and a plurality of push boxes; the collar comprises a collar inner ring and a collar outer ring, an annular groove is formed between the collar inner ring and the collar outer ring; two gear rings are arranged on the outer wall of the collar outer ring, a gear rotating shaft and an elastic member are arranged inside each push box, an arc-shaped clamping plate is arranged on the inner side surface of the push box, and a rotating groove is also arranged on the side plate of the push box, and the rotating groove extends from the outer side surface to the side surface connected to the outer side surface; the sliding limit of the arc-shaped clamping plate is located in the annular groove; rotating gears are respectively arranged on the upper and lower ends of the gear rotating shaft, a push column is connected to the middle part of the gear rotating shaft, the two rotating gears are respectively meshed 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 push box, the elastic member is in a compressed or stretched state, and the push column limit is located in the sliding rotating groove. After the limit of the jacking box is released, the elastic part of the expansion device can drive the jacking box and the gear rotating shaft therein to rotate, so that the jacking column on the gear rotating shaft rotates in the rotating groove, and then the end of the jacking column is against the flexible cloth bag, and the flexible cloth bag is expanded outward, so as to actively expand the pile diameter during the pile construction process and avoid lateral leakage of mud or concrete along the gap on the side of the pile during the pouring of concrete, thereby ensuring the quality of piles in karst areas and further reducing the cost of pile foundation construction in karst areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a stereoscopic diagram of the main structure of a flexible wall protection pile bottom expansion device suitable for karst areas according to an embodiment of the present invention.

[0020] Figure 2 It is a stereoscopic diagram of a collar of a flexible wall protection pile bottom expansion device suitable for karst areas according to an embodiment of the present invention.

[0021] Figure 3 It is a top view of the internal structure of a jacking box of a flexible wall protection pile bottom expansion device suitable for karst areas according to an embodiment of the present invention (the connection structure between the elastic member and the gear rotating shaft is not drawn).

[0022] In the above figure: 1-inner ring of the collar, 2-outer ring of the collar, 3-annular groove, 4-gear ring, 5-push box, 51-rotation groove, 52-arc rack, 53-arc clamping plate, 6-gear rotation shaft, 61-rotation gear, 7-push column, 8-elastic member, 9-limit rod. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0024] Please refer to Figures 1 to 3The flexible wall protection pile bottom expansion device suitable for karst areas of the present invention comprises a sleeve ring and a plurality of push boxes. The plurality of push boxes are evenly arranged around the sleeve ring.

[0025] The collar is a double-layer collar, comprising a collar inner ring 1 and a collar outer ring 2, the collar inner ring 1 and the collar outer ring 2 are coaxially arranged and fixedly connected, and an annular groove 3 is formed between the collar inner ring 1 and the collar outer ring 2; the outer wall of the collar outer ring 2 is provided with two gear rings 4, and the two gear rings 4 are relatively arranged up and down.

[0026] Each of the push boxes is provided with a gear shaft 6 and an elastic member 8, and an arc-shaped clamping plate 53 is provided on the inner side of the push box, and the arc-shaped clamping plate 53 is fixedly connected to the push box. The arc of the arc-shaped clamping plate 53 is the same as that 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] A rotation groove 51 is also provided on the side plate of the push box 5, and the rotation groove 51 extends from the outer side surface to the side surface connected to the outer side surface. In this embodiment, the rotation groove 51 extends from the outer side surface to the right side surface; the upper and lower ends of the gear rotating shaft 6 are provided with a rotation gear 61, and the two rotation gears 61 on the gear rotating shaft 6 are respectively meshed with the two gear rings 4 on the outer ring 2 of the sleeve ring, and a push column 7 is connected to the middle of the gear rotating shaft 6. One end of the push column 7 is fixedly connected to the gear rotating shaft 6, and the other end passes through the rotation groove 51 and extends to the outside of the push box 5, and the gear rotating shaft 6 can be slidably limited in the sliding rotation groove 51, and the elastic member 8 ( Figure 3 One end of the elastic member (not fully drawn) is connected to the gear rotating shaft 6, and the other end is connected to the inner wall of the push box. The elastic member 8 is in a compressed or stretched state, and the push column 7 is limited in the sliding rotating groove 51. The push box is also provided with a limiter, which is used to limit the rotation of the rotating gear 61. The outer side of the collar is also provided with an annular flexible cloth bag (the flexible cloth bag is not drawn in the figure), and all the push boxes are located in the flexible cloth bag.

[0028] When the expansion device is in use, the inner wall of the inner ring 1 of the sleeve is welded to the steel cage of the flexible wall protection pile. When the steel cage is lowered to the bottom, the limit pieces on each push box are pulled out. After the limit pieces of the push box are released, the elastic piece 8 can drive the push box and the gear rotating shaft 6 therein to rotate, so that the push column 7 on the gear rotating shaft 6 rotates in the rotating groove 51, and then the end of the push column 7 is pressed against the flexible cloth bag, which is stretched out and expanded, so as to actively expand the pile diameter during the pile construction process and avoid the lateral leakage of mud or concrete along the gap on the side of the pile during the concrete pouring process, thereby ensuring the pile quality in the karst area and further reducing the cost of pile foundation construction in the karst area.

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

[0030] In a preferred embodiment, two arc-shaped racks 52 are further provided on the inner wall of the push box, and the two rotating gears 61 and the two arc-shaped racks 52 are respectively meshed, so that the rotating gear 61 on the gear rotating shaft 6 can be set between the gear ring and the arc-shaped rack 52, thereby ensuring the stability of the rotating gear 61 and the gear rotating shaft 6 during movement.

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

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

[0033] In a preferred embodiment, a limiting groove is further provided between the arc-shaped clamping plate 53 and the side plate of the push box, and the outer ring of the collar is limited in the limiting groove, so that the collar and the push box can form a mutually interlocking structure, thereby ensuring the stability of the sliding connection between the collar and the push box.

[0034] In a preferred embodiment, the inner ring 1 and the outer ring 2 have the same height, and the inner ring 1 and the outer ring 2 are connected at the bottom through an annular bottom plate, so that the annular groove 3 can be an open structure at the top and closed at the bottom, and the inner ring 1, the outer ring 2 and the annular bottom plate are an integrated structure. The arc clamping plate 53 is half the height of the outer ring, and the arc clamping plate 53 is slidably engaged in the annular groove 3 from the upper opening of the annular groove 3.

[0035] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0036] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible wall pile bottom expansion device suitable for karst areas, characterized in that: including a collar and a plurality of push boxes; The collar comprises an inner collar and an outer collar, the inner collar and the outer collar are coaxially arranged and fixedly connected, and an annular groove is formed between the inner collar and the outer collar; the outer wall of the outer collar is provided with two gear rings, and the two gear rings are arranged relatively up and down; Each of the push boxes is provided with a gear rotating shaft and an elastic member, an arc-shaped clamping plate is provided on the inner side of the push box, and a rotating groove is provided on the side plate of the push box, and the rotating groove extends from the outer side to the side connected to the outer side; the arc-shaped clamping plate is slidably limited in the annular groove; Rotating gears are provided at the upper and lower ends of the gear rotating shaft, and a push column is connected to the middle of the gear rotating shaft. 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 to slide in the rotating groove.

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

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

4. The flexible wall protection pile bottom expansion device suitable for karst areas according to claim 1 is characterized in that: The elastic member is a coil spring.

5. The flexible wall protection pile bottom expansion device suitable for karst areas according to claim 1 is characterized in that: The push box is also provided with a limiter, and the limiter is used to limit the rotation of the rotating gear.

6. The flexible wall protection pile bottom expansion device suitable for karst areas according to claim 5 is characterized in that: The push box is also provided with a first limiting hole, the gear ring on the outer wall of the collar is also 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 push box from rotating relative to the collar.

7. The flexible wall protection pile bottom expansion device suitable for karst areas according to claim 1 is characterized in that: A flexible cloth bag is also arranged on the outer side of the sleeve ring, and all the push boxes are located in the flexible cloth bag.

8. The flexible wall protection pile bottom expansion device suitable for karst areas according to claim 1 is characterized in that: A limiting groove is also provided between the arc-shaped clamping plate and the push box, and the outer ring of the sleeve ring is limited in the limiting groove.

9. The flexible wall protection pile bottom expansion device suitable for karst areas according to claim 1, characterized in that: The inner wall of the inner ring of the sleeve is welded to the steel cage of the flexible wall protection pile.

10. The flexible wall protection pile bottom expansion device suitable for karst areas according to claim 1, characterized in that: The inner ring of the collar and the outer ring of the collar have the same height, and the bottoms of the inner ring of the collar and the outer ring of the collar are 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 collar.

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