Uplift pile head connecting device capable of releasing shear rigidity and settlement stress and connecting method

Abstract

The invention discloses an uplift pile head connecting device capable of releasing shear rigidity and settlement stress and a connecting method, and belongs to the technical field of safety management of mining area structures. The device comprises a vertical buffer unit and a horizontal sliding unit. A supporting cylinder of the vertical buffering unit is arranged on the concrete pile in a sleeving mode, composed of an inner sleeve, an outer sleeve and an annular plate and fixed through an anchor bolt. The belleville spring set is arranged on the upper annular plate of the supporting cylinder as a buffering piece. The horizontal sliding unit comprises an upper-layer steel plate and a lower-layer steel plate, the upper-layer steel plate is installed at the bottom of the bearing platform cushion layer, and the lower-layer steel plate is fixed to the top face of the belleville spring set and can horizontally slide relative to the belleville spring set. When the ground moves horizontally, the upper-layer steel plate and the lower-layer steel plate move in a staggered mode to release horizontal shearing force, the ground sinks unevenly, the sinking side bearing platform transmits pressure to the belleville spring set through the steel plates to release vertical pressure, and the lifting side bearing platform and the concrete pile maintain tensile force through the steel bars. The problems of pile body cracking, foundation damage and the like caused by rigid connection can be effectively solved, and the safety and stability of the pile foundation under the influence of complex deformation of the foundation are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of structural safety management in mining areas, and in particular to a pull-out resistant pile head connection device and a connection method capable of releasing shear stiffness and settlement stress. Background Art

[0002] In engineering practice, some engineering structures (such as high-rise buildings, heavy structures, etc.) need to be built above mining areas or goaf areas, and the ground surface is prone to deformation, which manifests as uneven settlement and horizontal displacement. These two situations will affect the stability of the foundation and foundation, and even cause structural instability. In the existing technology, for structures that are sensitive to settlement and horizontal surface deformation, the original foundation is reinforced with pile foundations to compensate for insufficient bearing capacity or provide anti-overturning ability. For tall structures, a reinforcement method of adding pile foundations on the outside of independent foundations is adopted: concrete piles with a depth of tens of meters are driven on the outside of four independent foundations, and the top of the concrete piles is rigidly connected to the upper pedestal by steel bar anchoring or integral concrete pouring. The pedestal is then connected to the independent foundation through a connecting beam to hold the independent foundation and prevent tilting. However, this type of rigid reinforcement has the following defects: when the tall structure tilts to one side, the reaction force generated by the concrete piles on the tilted side will be transmitted to the independent foundation and the entire superstructure through the pedestal and connecting beams, causing the foundation concrete to crack and the foundation connecting beams to bend and deform under the force, ultimately changing the stability of the superstructure and causing structural instability; when the ground moves horizontally, the rigid connection between the concrete piles and the pedestal will cause the pile body to bear horizontal shear force, causing the pile body to crack or even break, threatening the safety of the entire structure. Summary of the Invention

[0003] The purpose of the present invention is to propose a pull-out resistant pile head connection device and connection method that can release shear stiffness and settlement stress, so as to solve the problem in the prior art that horizontal shear force and vertical pressure cannot be released due to the rigid connection between the pedestal and the concrete pile.

[0004] The technical solution adopted by the present invention is as follows: In a first aspect, the present invention proposes an anti-pullout pile head connection device capable of releasing shear stiffness and settlement stress, comprising:

[0005] A vertical buffer unit, comprising a support tube, a buffer member and a fixing member, wherein the support tube is sleeved on the concrete pile and fixed by the fixing member; the support tube is composed of an inner sleeve and an outer sleeve, and an annular plate is used to fix the inner sleeve upper end and the outer sleeve lower end horizontally between the inner sleeve upper end and the outer sleeve lower end; the fixing member comprises an anchor bolt, which is vertically driven into the concrete pile body through the support tube to fix the support tube to the concrete pile; the buffer member comprises a butterfly spring group, which is circumferentially arranged on the annular plate on the upper part of the support tube;

[0006] A horizontal sliding unit includes an upper steel plate and a lower steel plate. The upper steel plate is fixed to the bottom of the pedestal cushion layer, and the lower steel plate is fixed to the top surface of the butterfly spring group. The upper steel plate is in contact with the lower steel plate and can slide horizontally relative to the lower steel plate.

[0007] As a further improvement of the present invention, the support cylinder is composed of two identical semi-cylinders, and the two semi-cylinders are installed on the concrete pile by bolts.

[0008] As a further improvement of the present invention, the vertical buffer unit also includes a steel sheet base plate and stiffening ribs II. The steel sheet base plate is horizontally fixed on the pile head surface of the concrete pile, the top of the support tube is higher than the concrete pile head, and multiple stiffening ribs II are fixed between the inner sleeve and the steel sheet base plate.

[0009] As a further improvement of the present invention, the steel sheet bottom plate is composed of a plurality of fan-shaped steel sheets and the same number of peripheral steel sheets, and semicircular holes are provided at intervals on the arc-shaped outer periphery of the fan-shaped steel sheets and the arc-shaped inner periphery of the peripheral steel sheets; the fan-shaped steel sheet bottom plate is enclosed into a circular sheet, and the adjacent ones are welded and fixed, and the peripheral steel sheets and the fan-shaped steel sheets are welded together to form the entire steel sheet bottom plate, and a circle of circular holes is formed between the peripheral steel sheets and the fan-shaped steel sheets.

[0010] As a further improvement of the present invention, the buffer component further includes a rubber column, the bottom of which is placed on the steel sheet bottom plate, and the upper part of which is flush with the butterfly spring assembly.

[0011] As a further improvement of the present invention, a web and stiffening ribs I are provided between the inner sleeve and the outer sleeve, the web is transversely fixed between the inner sleeve and the outer sleeve, and the stiffening ribs I are vertically fixed between the inner sleeve and the outer sleeve to reinforce the support sleeve.

[0012] As a further improvement of the present invention, the fixing member further includes at least one clamping hoop, and the clamping hoop is fixed on the outer sleeve.

[0013] As a further improvement of the present invention, a mirror stainless steel plate is set on the upper surface of the lower steel plate, and multiple polytetrafluoroethylene plates are fixed on the bottom surface of the upper steel plate to form a low friction pair through the polytetrafluoroethylene plate and the mirror stainless steel plate.

[0014] As a further improvement of the present invention, the upper steel plate and the bottom steel plate are both square plates, both of which are formed by connecting two identical halves. A circular opening is opened between the upper steel plate and the lower steel plate, and the size of the circular opening is greater than or equal to the diameter of the concrete pile.

[0015] In a second aspect, the present invention provides a method for connecting an anti-pullout pile head capable of releasing shear stiffness and settlement stress; the method adopts the above-mentioned anti-pullout pile head connection device capable of releasing shear stiffness and settlement stress, and the method comprises the following steps:

[0016] Step 1: Perform local destructive treatment on the top of the concrete pile below the cap, removing the concrete to expose a circle of steel bars inside, forming a separate space connected only by steel bars. Then, grind and clean the top surface of the pile head to make it a flat concrete section.

[0017] Step 2: Make a steel base plate on the concrete section. First, place several fan-shaped steel plates inside the steel bars to form a circular plate and weld them together, so that the semicircular holes on the outer periphery of the fan-shaped steel plates are embedded in one side of the steel bars. Then, place the outer peripheral steel plates outside the fan-shaped steel plates, so that the semicircular holes on the inner periphery of the steel plates are embedded in the other side of the steel bars. Then weld them to the fan-shaped steel plates to form a complete steel base plate, and embed a circle of steel bars in it.

[0018] Step 3: Fit the two semi-circular cylinders of the support cylinder to the concrete pile body, so that the top of the cylinder is higher than the concrete section, lock it with bolts, fix it with multiple anchor bolts around the circumference, and tighten it with a clamp;

[0019] Step 4: Arrange multiple butterfly spring groups evenly on the annular plate, and weld the lower steel plate to the top of the butterfly spring group; fix the upper steel plate that is spliced into a whole in half on the bottom surface of the pedestal cushion layer, so that the upper steel plate and the lower steel plate are in contact and can slide horizontally relative to each other; when the ground moves horizontally, the upper and lower steel plates move relative to each other to release horizontal shear force; when the ground settles unevenly, the pedestal on the sinking side transfers the pressure to the butterfly spring group and rubber column through the upper and lower steel plates to release vertical pressure, and the pedestal on the lifted side and the concrete pile rely on steel bars to maintain tension.

[0020] Compared with the prior art, the present invention has the following technical effects:

[0021] (1) This device combines two functions: when the ground moves horizontally, the horizontal sliding layer formed by the upper steel plate and the lower steel plate can move relative to each other, thereby releasing the shear force in the horizontal direction, preventing the concrete piles from cracking or even breaking due to the horizontal shear force, and ensuring the safety of the foundation structure; when the ground settles unevenly, the pedestal on the sinking side transfers the pressure to the butterfly spring group through the upper and lower steel plates, releasing the pressure in the vertical direction, while the pedestal on the lifting side and the concrete piles maintain tension through the steel bars, preventing the independent foundation from cracking, the foundation connecting beam from bending and deforming due to stress, and maintaining the overall stability of the foundation;

[0022] (2) When the ground sinks and the butterfly spring group is flattened, the pressure is transmitted to the concrete piles through the stiffener II and the steel plate bottom plate. The concrete piles continue to bear the pressure, thereby reducing the support pressure of the support tube and maintaining the stability of the superstructure.

[0023] (3) This installation method crushes the concrete piles at the bottom of the pedestal to leave a buffer space for vertical pressure, leaving only a circle of steel bars. On the inclined side, the steel bars will bend and deform after being subjected to a certain pressure, and the pressure is borne by the buffer parts (butterfly springs and rubber columns). On the raised side, it can maintain the connection between the concrete piles and the pedestal, and bear the tension on the pedestal to maintain the stability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 It is a structural schematic diagram of a pile head connection device capable of releasing shear force and settlement stress according to the present invention;

[0026] Figure 2 yes Figure 1 AA section view;

[0027] Figure 3 It is a schematic diagram of the composition and combination of the steel sheet bottom plate;

[0028] Figure 4 This is a diagram of the state of the connection device receiving vertical pressure when the ground sinks 50mm;

[0029] Figure 5 This is the state diagram of the connecting device receiving horizontal shear force when the ground moves 10mm;

[0030] Explanation of the accompanying numbers: 1-inner sleeve, 2-outer sleeve, 3-web, 4-stiffening rib I, 5-anchor bolt, 6-hoop, 7-butterfly spring group, 8-steel sheet bottom plate, 81-fan-shaped steel sheet I, 82-fan-shaped steel sheet II, 83-peripheral steel sheet I, 84-peripheral steel sheet II, 9-stiffening rib II, 10-rubber column, 11-upper steel plate, 12-lower steel plate, 13-pedestal, 14-pedestal cushion, 15-concrete pile, 16-rebar. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments derived by persons of ordinary skill in the art are within the scope of protection of the present invention.

[0032] like Figure 1 and Figure 2 As shown, the pull-out resistant pile head connection device of the present invention, which can release shear stiffness and settlement stress, includes a vertical buffer unit and a horizontal sliding unit.

[0033] The vertical buffer unit comprises a support tube, a buffer element, and a fixing element. The support tube is mounted on a concrete pile 15 and secured by the fixing element. Specifically, the support tube consists of an inner sleeve 1 and an outer sleeve 2. Ring plates are located horizontally between the upper and lower ends of the inner and outer sleeves 1 and 2, respectively. The ring plates connect the inner and outer sleeves 1 and 2 and serve as a support platform. The support tube is composed of two identical semi-circular cylinders, which are bolted to the concrete pile 15. The fixing elements include an anchor bolt 5 and a clamp 6. The anchor bolt 5 is driven through a through hole in the support tube into the concrete pile 15, securing the support tube to the concrete pile 15. The clamp 6 is secured to the outer sleeve. The buffer element includes a butterfly spring assembly 7, which is circumferentially arranged on an annular plate on the upper portion of the support tube. Specifically, the buffer element also includes a rubber column 10, the bottom of which rests on a steel base plate 8 and the top is located below the lower base plate 12.

[0034] The horizontal sliding unit includes an upper steel plate 11 and a lower steel plate 12. The upper steel plate 11 is installed at the bottom of the base cushion layer 14, and the lower steel plate 12 is fixed to the top surface of the butterfly spring assembly 7. The upper steel plate 11 and the lower steel plate 12 are in contact and can slide horizontally relative to the lower steel plate 12. The upper steel plate 11 and the lower steel plate 12 are both square plates, and both are formed by connecting two identical halves. A circular opening is defined between the upper steel plate 11 and the lower steel plate 12, and the size of the circular opening is greater than or equal to the diameter of the concrete pile 15. A mirror-finished stainless steel plate is provided on the upper surface of the lower steel plate 12, and multiple polytetrafluoroethylene plates are fixed to the bottom surface of the upper steel plate 11. The polytetrafluoroethylene plates and the stainless steel plates form a low-friction pair to reduce sliding friction.

[0035] The vertical buffer unit also includes a steel plate bottom plate 8 and stiffening ribs II9. The steel plate bottom plate 8 is horizontally fixed to the pile head of the concrete pile 15. The top of the support tube is higher than the pile head of the concrete pile 15. A plurality of stiffening ribs II9 are fixed between the inner sleeve 1 and the steel plate bottom plate 8. A web 3 and stiffening ribs I4 (such as Figure 2 As shown in the figure, the combination of horizontal webs and vertical stiffeners can improve the lateral stiffness of the support tube, effectively resist the bending moment caused by the lateral deformation of the concrete pile, avoid local buckling of the support tube, and ensure the stability of the vertical load transfer path.

[0036] The steel sheet bottom plate 8 is composed of a plurality of sector-shaped steel sheets and the same number of peripheral steel sheet bottom plates. Semicircular holes are provided at intervals on the arc-shaped outer periphery of the sector-shaped steel sheets and the arc-shaped inner periphery of the peripheral steel sheets. The sector-shaped steel sheet bottom plates are combined into a circular plate and fixed to each other by welding. The peripheral steel sheets and the sector-shaped steel sheets are welded together to form the entire steel sheet bottom plate, and a circle of circular holes is formed on the steel sheet bottom plate. Specifically, as Figure 3As shown, the steel sheet base plate 8 includes a sector steel sheet I81, a sector steel sheet II82, a peripheral steel sheet I83, and a peripheral steel sheet II84. The steel sheet base plate 8 is divided into the four sections above to account for interference caused by the steel bars 16, which cannot be placed in a single piece. There are 23 steel bars 16. The difference between sector steel sheet I81 and sector steel sheet II82 is that the sector angle of the former is larger than that of the latter. Similarly, the sector angle difference between peripheral steel sheet I83 and peripheral steel sheet II84 is also the same. Each of the four steel sheets is provided with a semicircular hole with a radius larger than that of the steel bar 16. When assembled, three sector steel sheets I81 and one sector steel sheet II82 are combined and placed inside the steel bar ring. The three peripheral steel sheets I83 are butt-welded to the sector steel sheet I81 on the outside of the steel bar 16, and one peripheral steel sheet II84 is butt-welded to the sector steel sheet II82 on the outside of the steel bar 16. This creates a complete steel sheet base on the top surface of the concrete pile 15, through which the steel bars 16 pass.

[0037] In some embodiments, the support tube also includes a web 3 and stiffening ribs I4 located between the inner sleeve 1 and the outer sleeve 2, multiple webs 3 are horizontally fixed between the inner sleeve 1 and the outer sleeve 2, and multiple stiffening ribs I4 are vertically fixed between the inner sleeve 1 and the outer sleeve 2 to reinforce the support tube.

[0038] The present invention also proposes a pull-out pile head connection method capable of releasing shear stiffness and settlement stress, comprising the following steps:

[0039] Step 1: Perform local destructive treatment on the top of the concrete pile 15 below the base 13 to remove the concrete, exposing a circle of steel bars 16 inside, forming a separate space connected only by the steel bars 16, and then grind and clean the top surface of the pile head to make it a flat concrete section; the flatness error of the concrete section after grinding and cleaning is ≤2mm to ensure that the steel plate bottom plate is evenly stressed.

[0040] Step 2: Fabricate the steel base plate 8 on the concrete section. First, place several sector-shaped steel plates inside the rebar 16 to form a circular plate and weld them together, ensuring that the outer semicircular holes of the sector-shaped steel plates are embedded on one side of the rebar 16. Next, place the outer peripheral steel plate outside the sector-shaped steel plate, with its inner semicircular holes embedded on the other side of the rebar 16. This is welded to the sector-shaped steel plate to form the complete steel base plate 8, into which a circle of rebar 16 is embedded. When assembling the steel base plate 8, ensure that the rebar holes are positioned with an accuracy of ±3mm to prevent uneven stress on the rebar.

[0041] Step 3: Fit the two semi-cylinders of the support tube to the concrete pile 15 so that the top of the tube is higher than the concrete section, lock it with bolts, fix it with multiple anchor bolts 5 around the circumference, and tighten it with a hoop 6.

[0042] Step 4: Evenly arrange multiple butterfly spring groups 7 on the annular plate, weld and secure the lower steel plate 12 to the top of the butterfly spring group 7; secure the upper steel plate 11, which is spliced in half, to the bottom surface of the pedestal cushion 14, so that the upper steel plate 11 and the lower steel plate 12 are in contact and can slide horizontally relative to each other. When the ground moves horizontally, the upper and lower steel plates 11 and 12 shift relative to each other to release horizontal shear force; when the ground settles unevenly, the pedestal 13 on the sinking side transfers pressure to the butterfly spring group 7 through the upper and lower steel plates to release vertical pressure, while the pedestal 13 and concrete pile 15 on the rising side rely on steel bars 16 to maintain tension.

[0043] like Figure 4 As shown, when the ground settles by 50 mm, due to the compressive instability of steel bars 16, rubber columns 8 and multi-stage disc spring groups 7 begin to work together, effectively absorbing settlement energy through progressive compression and deformation, while also achieving precise adjustment of the pile-cap spacing. When disc spring group 7 is compressed to its designed limit displacement, concrete pile 15 enters a full-section compression state, ensuring complete load transfer. The total compression stroke of disc spring group 7 is determined based on the expected settlement of the goaf.

[0044] like Figure 5 As shown in the figure, when the ground deforms horizontally, it moves 10 mm and adopts a high-strength wear-resistant sliding interface (friction coefficient μ≤0.1). The shear force of the pile body is effectively released through controllable relative displacement, which can adapt to a maximum horizontal deformation of ±10 mm, thereby significantly reducing the bending moment stress of the pile foundation.

[0045] The adjustment method of the present invention realizes dual adaptive adjustment of vertical settlement and horizontal deformation through the integrated design of the connection structure, which greatly improves the deformation coordination ability of the pile foundation while ensuring the overall stability of the structure.

[0046] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Various changes that can be made within the scope of knowledge possessed by technicians in the relevant technical field without departing from the spirit of the present invention are all within the scope of protection of the claims of the present invention.

Claims

1. A pull-out pile head connection device capable of releasing shear stiffness and settlement stress, characterized in that: include: A vertical buffer unit, comprising a support tube, a buffer member and a fixing member, wherein the support tube is sleeved on a concrete pile (15) and fixed by a fixing member; the support tube is composed of an inner sleeve (1) and an outer sleeve (2), and an annular plate is used to fix the upper end of the inner sleeve (1) and the upper end of the outer sleeve (2), as well as the bottom end of the inner sleeve (1) and the bottom end of the outer sleeve (2) in a horizontal fixed connection; the fixing member comprises an anchor bolt (5), which is vertically driven into the pile body of the concrete pile (15) through the support tube to fix the support tube on the concrete pile (15); the buffer member comprises a butterfly spring group (7), which is circumferentially arranged on the annular plate on the upper part of the support tube; A horizontal sliding unit comprises an upper steel plate (11) and a lower steel plate (12), wherein the upper steel plate (11) is fixed to the bottom of a bearing pad (14), and the lower steel plate (12) is fixed to the top surface of a butterfly spring group (7), and the upper steel plate (11) contacts the lower steel plate (12) and can slide horizontally relative to the lower steel plate (12).

2. The pull-out resistant pile head connection device capable of releasing shear stiffness and settlement stress according to claim 1, characterized in that: The support cylinder is composed of two identical semi-cylinders, which are butt-jointed and mounted on a concrete pile (15) by bolts.

3. The pull-out resistant pile head connection device capable of releasing shear stiffness and settlement stress according to claim 2, characterized in that: The vertical buffer unit also includes a steel sheet bottom plate (8) and stiffening ribs II (9). The steel sheet bottom plate (8) is horizontally fixed on the pile head surface of the concrete pile (15). The top of the support tube is higher than the pile head of the concrete pile (15). A plurality of stiffening ribs II (9) are fixed between the inner sleeve (1) and the steel sheet bottom plate (8).

4. The pull-out resistant pile head connection device capable of releasing shear stiffness and settlement stress according to claim 3, characterized in that: The steel sheet bottom plate (8) is composed of a plurality of sector-shaped steel sheets and an equal number of peripheral steel sheets, and semicircular holes are provided at intervals on the arc-shaped outer peripheries of the sector-shaped steel sheets and the arc-shaped inner peripheries of the peripheral steel sheets; the sector-shaped steel sheet bottom plate is enclosed into a circular sheet, and adjacent ones are welded and fixed, and the peripheral steel sheets and the sector-shaped steel sheets are welded together to form the entire steel sheet bottom plate, and a circle of circular holes is formed between the peripheral steel sheets and the sector-shaped steel sheets.

5. The pull-out resistant pile head connection device capable of releasing shear stiffness and settlement stress according to claim 1, characterized in that: The buffer component also includes a rubber column (10), the bottom of which is placed on the steel sheet bottom plate (8) and the top is flush with the butterfly spring group (7).

6. The pull-out resistant pile head connection device capable of releasing shear stiffness and settlement stress according to claim 1, characterized in that: A web (3) and a stiffening rib I (4) are provided between the inner sleeve (1) and the outer sleeve (2). The web (3) is transversely fixed between the inner sleeve (1) and the outer sleeve (2), and the stiffening rib I (4) is vertically fixed between the inner sleeve (1) and the outer sleeve (2) to reinforce the support tube.

7. The pull-out resistant pile head connection device capable of releasing shear stiffness and settlement stress according to claim 1, characterized in that: The fixing member further comprises at least one clamping hoop (6), and the clamping hoop (6) is fixed on the outer sleeve (2).

8. The pull-out resistant pile head connection device capable of releasing shear stiffness and settlement stress according to claim 1, characterized in that: A mirror stainless steel plate is arranged on the upper surface of the lower steel plate (12), and a plurality of polytetrafluoroethylene plates are fixed on the bottom surface of the upper steel plate (11), so that a low friction pair is formed by the polytetrafluoroethylene plates and the mirror stainless steel plates.

9. The pull-out resistant pile head connection device capable of releasing shear stiffness and settlement stress according to claim 1, characterized in that: The upper steel plate (11) and the bottom steel plate (12) are both square plates, and are formed by connecting two identical halves. A circular opening is opened between the upper steel plate (11) and the bottom steel plate (12), and the size of the circular opening is greater than or equal to the diameter of the concrete pile (15).

10. A method for connecting a pull-out pile head capable of releasing shear stiffness and settlement stress, characterized in that: The method uses the pull-out resistant pile head connection device capable of releasing shear stiffness and settlement stress according to any one of claims 1 to 9, and the method comprises the following steps: Step 1: Perform local destructive treatment on the top of the concrete pile (15) below the cap (13), remove the concrete, expose a circle of steel bars (16) inside, form a separate space connected only by the steel bars (16), and then grind and clean the top surface of the pile head to make it a flat concrete cross-section; Step 2: Make a steel plate bottom plate (8) on the concrete section. First, place several fan-shaped steel plates inside the steel bar (16) to form a circular plate and weld them together, so that the semicircular holes on the outer periphery of the fan-shaped steel plates are embedded in one side of the steel bar (16); then place the outer peripheral steel plates outside the fan-shaped steel plates, so that the semicircular holes on the inner periphery of the outer peripheral steel plates are embedded in the other side of the steel bar (16), and weld them to the fan-shaped steel plates to form a complete steel plate bottom plate (8), and embed a circle of steel bars (16) in it; Step 3: Fit the two semi-circular cylinders of the support cylinder to the concrete pile (15) so that the top of the cylinder is higher than the concrete section, tighten it with bolts, fix it with multiple anchor bolts (5) around the circumference, and tighten it with a hoop (6); Step 4: a plurality of butterfly spring groups (7) are evenly arranged on the annular plate, and a lower steel plate (12) is welded and fixed to the top of the butterfly spring group (7); an upper steel plate (11) that is spliced into a whole in half is fixed on the bottom surface of the pedestal cushion layer (14), so that the upper steel plate (11) and the lower steel plate (12) are in contact and can slide horizontally relative to each other; when the ground moves horizontally, the upper steel plate (11) and the lower steel plate (12) are relatively displaced to release horizontal shear force; when the ground settles unevenly, the pedestal (13) on the sinking side transmits pressure to the butterfly spring group (7) and the rubber column through the upper and lower steel plates to release vertical pressure, and the pedestal (13) on the lifting side and the concrete pile (15) rely on the steel bar (16) to maintain tension.

Images