A small-diameter shaft adaptive ring beam support system based on steel pipe pile enclosure and adjustment method

Abstract

The present invention relates to an adaptive ring beam support system and adjustment method for a small-diameter vertical shaft, and belongs to the field of underground engineering technology. The adaptive ring beam support system for a small-diameter vertical shaft based on steel pipe pile enclosure includes a flexible chain purlin, a rigid double-piece composite ring beam, an adaptive support unit, a scissor-type telescopic link, and a steel casing clamping unit; the flexible chain purlin and the steel pipe pile enclosure are connected by a radially arranged adaptive support unit, and the adaptive adjustment of the steel pipe pile enclosure structure is achieved by adjusting the spacing between the two support rollers of the adaptive support unit; the rigid double-piece composite ring beam and the flexible chain purlin are connected by a radially arranged scissor-type telescopic link, and a clamping force is applied to the rigid double-piece composite ring beam through the steel casing clamping unit, and the rigid double-piece composite ring beam provides tension to the flexible chain purlin through circumferential stress. The method provides a safe, reliable, and efficient construction solution for the construction of steel pipe pile enclosure for small-diameter vertical shafts.

Description

Technical Field

[0001] The invention belongs to the technical field of underground engineering, and in particular relates to a small-diameter vertical shaft adaptive ring beam support system and an adjustment method. Background Art

[0002] Due to construction precision limitations, the placement of steel pipe piles can deviate somewhat. When used as retaining walls, the individual steel pipe piles struggle to maintain the alignment shown on the design drawings, and the circularity of the steel pipe pile enclosure cannot be guaranteed during shaft excavation. Traditionally, steel purlins have been widely used. The regular contours of the steel purlins collide with the irregular contours of the steel pipe pile retaining wall, resulting in uneven stress on the support system and the risk of instability. This also presents difficulties in assembly and construction.

[0003] The use of a prefabricated support system consisting of steel purlins and steel braces makes it difficult to ensure the close contact between the retaining wall and the support system, as with cast-in-place concrete supports. This results in a significant discrepancy between the actual load-bearing mechanism of the entire retaining structure and the design calculations. The lack of close contact between the ring beams leads to localized defects in the load-bearing system, increasing system uncertainty and significantly increasing the safety risk of the foundation pit. Furthermore, the redundant gaps between the steel purlins and the steel pipe piles allow for deformation of the soil behind the wall, which is particularly detrimental to controlling the impact on the surrounding environment.

[0004] Therefore, how to provide an adaptive ring beam support system for a small-diameter vertical shaft based on steel pipe pile enclosure is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In order to solve the problem that the construction accuracy of steel pipe pile enclosure for small-diameter vertical shafts may lead to local voids in the annular ring beam, the present invention provides an adaptive ring beam support system for small-diameter vertical shafts based on steel pipe pile enclosures. The system is an annular support system that adapts to the irregular configuration of the steel pipe pile enclosure wall, providing a safe, reliable and efficient solution for the construction of steel pipe pile enclosures for small-diameter vertical shafts, which can actively adjust and control the axial force.

[0006] In order to solve the above technical problems, the present invention includes the following technical solutions:

[0007] An adaptive ring beam support system for a small-diameter vertical shaft based on steel pipe pile enclosure, comprising a flexible chain-type purlin, a rigid double-piece composite ring beam, an adaptive support unit, a scissor-type telescopic connecting rod, and a steel box clamping unit;

[0008] The flexible chain purlin and the steel pipe pile enclosure are connected by radially arranged adaptive support units, and adaptive adjustment of the steel pipe pile enclosure structure is achieved by adjusting the distance between the two support rollers of the adaptive support unit;

[0009] The rigid double-piece composite ring beam and the flexible chain-type purlin are connected by radially arranged scissor-type telescopic connecting rods, and a clamping force is applied to the rigid double-piece composite ring beam through a steel box clamping unit. The rigid double-piece composite ring beam provides tension for the flexible chain-type purlin through hoop stress.

[0010] Furthermore, the flexible chain purlin is connected in multiple sections by bolts, and a set of adaptive support units is arranged between each section. The adaptive support unit is subjected to force by supporting rollers that are in close contact with the outer steel pipe piles. The spacing between the two support rollers of the adaptive support unit is adjusted, and the support rollers roll with the arc surface of the steel pipe piles to adaptively find the initial close contact position.

[0011] Furthermore, the rigid double-piece composite ring beam comprises an upper composite ring beam and a lower composite ring beam which are vertically arranged and connected by springs, and the upper and lower ends of the rigid double-piece composite ring beam are respectively connected to the steel casing clamping unit by jacks.

[0012] The present invention also provides a method for adjusting a small-diameter shaft adaptive ring beam support system, the method comprising the following steps:

[0013] Step S1, providing the small-diameter shaft adaptive ring beam support system based on steel pipe pile enclosure for standby;

[0014] Step S2, initial installation adjustment: The flexible chain purlin is connected to multiple sections by bolts, and a set of adaptive support units is arranged between each section. The flexible chain purlin is connected to the support rollers by support connecting rods. The adaptive support units are closely attached to the outer steel pipe piles through the support rollers. The spacing between the two support rollers of the adaptive support unit is adjusted, and the support rollers roll on the arc surface of the steel pipe piles to adaptively find the initial close contact position;

[0015] Step S3, subsequent servo adjustment: When it is found that the local support force is abnormal such as loss of force or over-force during the shaft excavation process, the steel box clamping unit arranged on the rigid double-piece composite ring beam is used to load or release the support force: the upper and lower jacks in the steel box clamping unit are used to push, and the rigid double-piece composite ring beam is squeezed and contracted, driving the spacing of the scissor-type telescopic links to decrease, thereby generating a pushing effect on the flexible chain-type purlin, and finally transmitted to each steel pipe pile enclosure through the adaptive support unit; the upper and lower jacks in the steel box clamping unit are retracted, and the rigid double-piece composite ring beam is acted upon by the return spring, driving the spacing of the scissor-type telescopic links to expand, thereby generating a recovery effect on the flexible chain-type purlin, and finally the supporting force of the adaptive support unit for the steel pipe pile enclosure is reduced.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] The present invention provides an adaptive ring beam support system for small-diameter vertical shafts based on steel pipe pile enclosures, which solves the problem of local voids in the annular ring beams caused by the construction accuracy of steel pipe pile enclosures for small-diameter vertical shafts. The annular support system with an irregular configuration of adaptive steel pipe pile enclosure walls can adaptively fit the existing gap between the steel pipe pile enclosures and the annular support system during the initial installation phase; through the flexible chain purlins, rigid double-piece composite ring beams, and scissor telescopic connecting rods of the present invention, during the excavation construction process, the expansion mechanism can further maintain active control capabilities for support hazards such as local voids and loosening according to enclosure deformation and support axial force conditions, providing safe, reliable, and efficient construction for small-diameter vertical shaft steel pipe pile enclosure construction, with the advantages of reciprocating utilization and active adjustment and control of axial force. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a small-diameter shaft adaptive ring beam support system based on steel pipe pile enclosure according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A partial enlarged view of

[0020] Figure 3 The figure is a schematic diagram showing the connections of the components of a small-diameter shaft adaptive ring beam support system based on steel pipe pile enclosure according to an embodiment of the present invention.

[0021] In the picture:

[0022] 1-Flexible chain purlin, 2-Rigid double-piece composite ring beam, 3-Adaptive support unit, 4-Scissor-type telescopic link, 5-Steel box clamping unit, 6-Support roller, 7-Support link, 8-Jack, 9-Spring, 10-Steel pipe pile. DETAILED DESCRIPTION

[0023] The following is a further detailed description of a small-diameter vertical shaft adaptive ring beam support system and adjustment method provided by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will become clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. For the convenience of description, the "up" and "down" mentioned below are consistent with the up and down directions of the accompanying drawings, but this cannot be a limitation of the technical solution of the present invention.

[0024] Principle: During the construction of small-diameter ultra-deep vertical shafts using steel pipe piles for enclosure, there will inevitably be deviations in positioning accuracy during the discrete sinking of the steel pipe piles. In order to ensure the effective stress of the annular purlin structure and reduce the excessive deformation of the soil behind the wall that may be caused by existing gaps, a circular support system with an adaptive steel pipe pile retaining wall with irregular configuration is creatively proposed.

[0025] Example 1

[0026] The following combination Figures 1 to 3 , the structural composition of the adaptive ring beam support system for small-diameter vertical shafts based on steel pipe pile enclosure is described in detail.

[0027] A small-diameter vertical shaft adaptive ring beam support system based on steel pipe pile enclosure includes a flexible chain purlin 1, a rigid double-piece composite ring beam 2, an adaptive support unit 3, a scissor-type telescopic link 4, and a steel casing clamping unit 5; the flexible chain purlin 1 and the steel pipe pile 10 enclosure are connected by radially arranged adaptive support units 3, and adaptive adjustment of the steel pipe pile 10 enclosure structure is achieved by adjusting the spacing between the two support rollers 6 of the adaptive support unit 3; the rigid double-piece composite ring beam 2 and the flexible chain purlin 1 are connected by radially arranged scissor-type telescopic links 4, and a clamping force is applied to the rigid double-piece composite ring beam 2 by the steel casing clamping unit 5. The rigid double-piece composite ring beam 2 is the force-bearing core of the entire adaptive annular support system, and provides tension for the flexible chain purlin 1 through circumferential stress.

[0028] Specifically, the steel box clamping unit 5 applies a clamping force to the rigid double-piece composite ring beam 2, thereby reducing the distance between the upper and lower pieces of the rigid double-piece composite ring beam 2, driving the scissor-type telescopic link 4 to perform shear expansion movement, thereby providing active control performance for the flexible chain purlin 1 during the excavation process, and strengthening the supporting effect of the steel pipe pile 10 retaining wall.

[0029] In this embodiment, more preferably, the rigid double-piece composite ring beam 2 includes an upper composite ring beam and a lower composite ring beam that are vertically arranged and connected by a spring 9, and the upper and lower ends of the rigid double-piece composite ring beam are respectively connected to the steel casing clamping unit through jacks.

[0030] Please continue to refer to Figures 1 to 3 The present invention also provides a method for adjusting a small-diameter shaft adaptive ring beam support system, the method comprising the following steps:

[0031] Step S1, providing the small-diameter shaft adaptive ring beam support system based on steel pipe pile enclosure for standby;

[0032] Step S2, initial installation adjustment: The flexible chain purlin 1 is connected to multiple sections by bolts, and a set of adaptive support units 3 is arranged between each section. The flexible chain purlin 1 is connected to the support roller 6 by a support link 7. The adaptive support unit 3 is closely attached to the outer steel pipe pile 10 through the support roller 6. The distance between the two support rollers 6 of the adaptive support unit 3 is adjusted, and the support roller 6 and the arc surface of the steel pipe pile 10 roll to adaptively find the initial close-fitting position.

[0033] Step S3, subsequent servo adjustment: When it is found that the local support force is abnormal such as loss of force or over-force during the shaft excavation process, the steel box clamping unit 5 arranged on the rigid double-piece composite ring beam 2 can be used to load or release the support force. The upper and lower jacks 8 in the steel box clamping unit 5 are used to push, and the rigid double-piece composite ring beam 2 is squeezed and contracted, driving the spacing of the scissor-type telescopic links 4 to decrease, thereby generating a pushing effect on the flexible chain-type purlin 1, and finally transmitted to each steel pipe pile 10 enclosure through the adaptive support unit 3; the upper and lower jacks 8 in the steel box clamping unit 5 are retracted, and the rigid double-piece composite ring beam 2 is acted upon by the return spring 9, driving the spacing of the scissor-type telescopic links 4 to expand, thereby generating a recovery effect on the flexible chain-type purlin 1, and finally reducing the supporting force of the adaptive support unit 3 on the steel pipe pile enclosure.

[0034] The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. The above embodiments only express several embodiments of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, several variations and improvements can be made, which all fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent of the present invention shall be based on the attached claims.

Claims

1. An adaptive ring beam support system for a small-diameter vertical shaft based on steel pipe pile enclosure, characterized in that: include Flexible chain-type purlin, rigid double-piece composite ring beam, adaptive support unit, scissor-type telescopic connecting rod, steel box clamping unit; The flexible chain purlin is connected to the steel pipe pile enclosure by a radially arranged adaptive support unit, and by adjusting the distance between the two support rollers of the adaptive support unit, the adaptive support unit is subjected to force by the support rollers in close contact with the outer steel pipe piles, thereby achieving adaptive adjustment of the steel pipe pile enclosure structure; The rigid double-piece composite ring beam and the flexible chain-type purlin are connected by radially arranged scissor-type telescopic connecting rods, and a clamping force is applied to the rigid double-piece composite ring beam through a steel box clamping unit. The rigid double-piece composite ring beam provides tension to the flexible chain-type purlin through hoop stress. The rigid double-piece composite ring beam comprises an upper composite ring beam and a lower composite ring beam which are arranged vertically and connected by springs. The upper and lower ends of the rigid double-piece composite ring beam are respectively connected to the steel casing clamping unit by jacks.

2. The small-diameter shaft adaptive ring beam support system based on steel pipe pile enclosure according to claim 1 is characterized in that: The flexible chain purlin is connected in multiple sections by bolts, and a set of adaptive support units is arranged between each section. The distance between the two support rollers of the adaptive support unit is adjusted, and the support rollers roll with the arc surface of the steel pipe pile to adaptively find the initial close contact position.

3. The adjustment method of the small-diameter shaft adaptive ring beam support system based on steel pipe pile enclosure according to claim 1 or 2, characterized in that: The steps include: Step S1, providing the small-diameter shaft adaptive ring beam support system based on steel pipe pile enclosure for standby; Step S2, initial installation adjustment: The flexible chain purlin is connected to multiple sections by bolts, and a set of adaptive support units is arranged between each section. The flexible chain purlin is connected to the support rollers by support connecting rods. The adaptive support units are closely attached to the outer steel pipe piles through the support rollers. The spacing between the two support rollers of the adaptive support unit is adjusted, and the support rollers roll on the arc surface of the steel pipe piles to adaptively find the initial close contact position; Step S3, subsequent servo adjustment: when it is found that the local support force is abnormally loose or over-stressed during the shaft excavation process, the support force is loaded or released through the steel casing clamping unit arranged on the rigid double-piece composite ring beam: the upper and lower jacks in the steel casing clamping unit are used for pushing, and the rigid double-piece composite ring beam is squeezed and contracted, driving the spacing of the scissor-type telescopic links to decrease, thereby generating a pushing effect on the flexible chain-type purlin, and finally transmitted to each steel pipe pile enclosure through the adaptive support unit; the upper and lower jacks in the steel casing clamping unit are retracted, and the rigid double-piece composite ring beam is acted upon by the return spring, driving the spacing of the scissor-type telescopic links to expand, thereby generating a recovery effect on the flexible chain-type purlin, and finally the supporting force of the adaptive support unit for the steel pipe pile enclosure is reduced.

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