Z-shaped steel sheet pile and construction method thereof

Abstract

The invention provides a Z-shaped steel sheet pile and a construction method thereof in order to improve the supporting effect and construction quality of the steel sheet pile, the Z-shaped steel sheet pile comprises a plurality of groups of linear sheet pile sections and arc-shaped sheet pile sections which are sequentially distributed in the circumferential direction of a foundation pit or a groove and connected, and each linear sheet pile section comprises a plurality of groups of two Z-shaped plates distributed inside and outside and a first connecting plate connected to the two Z-shaped plates in an up-down sliding mode; a drainage channel, a sand blasting channel and a lubricating channel are arranged in the Z-shaped plate, drainage holes connected with the drainage channel are formed in the upper portions of the inner side face and the outer side face, and sand blasting holes and lubricating holes which are connected with the sand blasting channel and the lubricating channel respectively are formed in the lower portions of the inner side face and the outer side face. The first connecting plate is matched with the drain hole opening and closing assembly to open the drain hole when sliding downwards and close the drain hole when sliding upwards; the lubrication hole opening and closing assembly opens the lubrication hole when the Z-shaped plate slides downwards and closes the lubrication hole when the Z-shaped plate slides upwards; the sand blasting hole opening and closing assembly opens the sand blasting holes when the Z-shaped plate slides upwards and closes the sand blasting holes when the Z-shaped plate slides downwards.

Claims

1. Z-type steel sheet pile, characterized in that: It includes a plurality of groups of straight sheet pile segments and arc-shaped sheet pile segments which are sequentially distributed and connected along the circumference of the foundation pit or trench, wherein: The straight sheet pile section is composed of a plurality of groups of two Z-shaped plates distributed inside and outside and a first connecting plate connected between the two Z-shaped plates by sliding up and down. The length of the Z-shaped plates is distributed along the circumference of the foundation pit or the groove, and the two ends in the length direction are provided with connecting mechanisms for sliding up and down; The arc-shaped sheet pile segment is connected between two groups of linear sheet pile segments adjacent to each other in the circumferential direction, and is composed of two arc-shaped plates distributed inside and outside and a second connecting plate slidably connected between the two arc-shaped plates up and down; A drainage channel, a sandblasting channel and a lubrication channel are arranged inside the Z-shaped plate along the height direction, a plurality of drainage holes are arranged at intervals and connected to the drainage channel at the upper part of the inner and outer sides along the height direction, a sandblasting hole and a lubrication hole are arranged at the lower part respectively connected to the sandblasting channel and the lubrication channel, and a first slide groove is also arranged on the side of the Z-shaped plate to slide up and down in cooperation with the first connecting plate; Also includes: A drainage hole opening and closing assembly is disposed in the first cavity inside the Z-shaped plate, and is used to cooperate with the drainage hole opening and closing assembly to open the drainage hole when the first connecting plate slides down, and to close the drainage hole when the first connecting plate slides up; The lubrication hole opening and closing assembly is arranged at the lower part of the inner and outer sides of the Z-shaped plate, and is used to open the lubrication hole when the Z-shaped plate slides down, and to close the lubrication hole when the Z-shaped plate slides up; The sandblasting hole opening and closing assembly is arranged at the sandblasting hole at the lower part of the Z-shaped plate, and is used for opening the sandblasting hole when the Z-shaped plate slides down, and closing the sandblasting hole when the Z-shaped plate slides down.

2. The Z-shaped steel sheet pile according to claim 1, characterized in that: A second cavity is also provided inside the Z-shaped plate, and the second cavity is communicated with the first slide groove. The drainage hole opening and closing assembly includes a friction wheel, a driving gear, a driven gear and a switch gear plate. The friction wheel is rotatably connected to the inside of the first cavity and one radial side extends into the inside of the first slide groove. The driving gear and the driven gear are both rotatably connected to the first cavity. The driving gear is meshingly connected to the driven gear and is coaxially fixedly connected to the friction wheel through a rotating shaft. The switch gear plate is meshingly connected to the driven gear, and the driven gear rotates to drive the switch gear plate to open or close the drainage hole.

3. The Z-shaped steel sheet pile according to claim 2, characterized in that: Filter plates are arranged at the drainage holes on the inner and outer sides of the Z-shaped plate. The filter plates are located outside the switch tooth plate. A water-permeable earth-blocking membrane is fixedly connected to the inner side of the filter plates.

4. The Z-shaped steel sheet pile according to claim 1, characterized in that: A first groove is provided at the lower part of the inner and outer side surfaces of the Z-shaped plate, the lubrication hole and the lubrication hole opening and closing assembly are both located in the first groove, the lubrication hole opening and closing assembly comprises a first resettable telescopic rod and a first baffle, the first baffle is slidably connected in the first groove up and down and the outer side surface is flush with the surface of the Z-shaped plate or is located outside the surface of the Z-shaped plate, the axis of the first resettable telescopic rod is distributed in the vertical direction, the fixed end and the movable end are respectively fixedly connected to the upper side wall of the first groove and the first baffle, and when the first baffle is not subjected to external friction, the first resettable telescopic rod drives the baffle to close the lubrication hole.

5. The Z-shaped steel sheet pile according to claim 1, characterized in that: A second groove is provided at the lower part of the inner and outer side surfaces of the Z-shaped plate, and the sandblasting hole and the sandblasting hole opening and closing assembly are both located in the second groove. The sandblasting hole second position hole groove opening and closing assembly includes a second resettable telescopic rod and a second baffle. The second baffle is slidably connected in the second groove up and down, and the axis of the second resettable telescopic rod is distributed in the vertical direction. The fixed end and the movable end are respectively fixedly connected to the lower side wall of the second groove and the lower end of the second baffle, and when the second baffle is not subjected to external friction, the second retractable reset telescopic rod drives the second baffle to close the sandblasting hole.

6. The Z-shaped steel sheet pile according to claim 4 or 5, characterized in that: The first repositionable telescopic rod and the second repositionable telescopic rod are both composed of a movable rod, a fixed rod coaxially slidably connected to the inside of the movable rod, and a first reset spring. The reset spring is coaxially arranged inside the fixed rod and the movable rod, and its two ends in the length direction are respectively connected to the ends of the fixed rod and the movable rod.

7. The Z-shaped steel sheet pile according to claim 4 or 5, characterized in that: A switch plate is hinged at the sandblasting hole and the lubrication hole, and a second return spring is arranged between the inner side of the switch plate and the inner wall of the sandblasting hole or the lubrication hole.

8. The Z-shaped steel sheet pile according to claim 1, characterized in that: The connection mechanism comprises a sliding boss and a second sliding groove respectively arranged at both ends of the Z-shaped plate in the length direction, and two circumferentially adjacent Z-shaped plates are connected by sliding up and down through the cooperation of the sliding boss and the second sliding groove.

9. The Z-shaped steel sheet pile according to claim 1, characterized in that: The inner and outer sides of the Z-shaped plate and the arc-shaped plate are both rollingly connected with balls, and the balls are distributed at intervals along the height direction of the Z-shaped plate and the arc-shaped plate.

10. A Z-shaped steel sheet pile construction method, based on the Z-shaped steel sheet pile according to any one of claims 1 to 9, characterized in that: The following steps are involved: a) Determine and mark the driving position of the steel sheet piles according to the design requirements; b) Use a vibrating pile driver to drive in the inner Z-shaped plate, the outer Z-shaped plate, the inner curved plate and the outer curved plate in sequence, and inject lubricant between the steel sheet pile and the soil through the lubrication channel during the driving process; c) driving the first connecting plate and the second connecting plate into the corresponding inner Z-shaped plate and outer Z-shaped plate and inner arc-shaped plate and outer arc-shaped plate respectively, so that the first connecting plate drives the drain hole opening and closing assembly to open the drain hole during the sliding process; d) Connect the drainage channel of the steel sheet piles through drainage pipes and use a water pump to assist in dewatering the foundation pit; e) Excavation of foundation pits during continuous precipitation; f) After the foundation pit is excavated, foundation construction is carried out; g) Remove the drainage pipeline and backfill the foundation pit; h) After the foundation pit is backfilled, the steel sheet piles are pulled out in the order of the first connecting plate and the second connecting plate, the inner Z-shaped plate and the inner arc-shaped plate, the outer Z-shaped plate and the outer arc-shaped plate, where: When the first connecting plate slides down, the drainage hole is closed by the drainage hole opening and closing assembly; When the Z-type plate is pulled upward, the lubrication hole opening and closing assembly closes the lubrication hole, and the sandblasting hole opening and closing assembly opens the sandblasting hole; While pulling out the Z-shaped plate, sand and gravel backfill is transported to the bottom of the steel sheet pile through the sandblasting channel and sandblasting holes to reinforce the soil.

11. The Z-shaped steel sheet pile construction method according to claim 10, characterized in that: During the driving of the steel sheet piles in step b), the injection pressure and flow rate of the lubricant are dynamically adjusted by monitoring the descending rate of the Z-plate to optimize the insertion efficiency of the steel sheet piles.

12. The Z-shaped steel sheet pile construction method according to claim 10, characterized in that: In the process of pulling out the Z-shaped plate in step h), sand and gravel backfill materials of different particle sizes and compositions are selected according to the soil type and density, and directional reinforcement is carried out through the sandblasting channel.

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