A free-angle high-load composite expanded pile

Abstract

The present invention provides a free-angle high-bearing composite expanded pile, which relates to the technical field of geotechnical and underground engineering. It includes a cement mixing pile and a rigid pile inserted in the cement mixing pile. An irregular enlarged body is provided at the bottom of the cement mixing pile, and a rigid enlarged head is provided at the bottom of the rigid pile, and the rigid enlarged head is inserted into the rigid enlarged body. It also includes shear studs fixed on the outer wall of the rigid pile, and core concrete is poured inside the rigid pile. The rigid enlarged head includes a rigid strengthening ring fixedly sleeved outside the rigid pile and rigid rib plates welded to the rigid strengthening ring. By means of the rigid strengthening ring and the rigid rib plates, the bottom of the rigid pile becomes an enlarged head with high bearing capacity and rigid fixed size, solving the technical problems of unstable bearing capacity and large discreteness. By forming a two-layer progressive rigid structure body, the problem of too large diameter ratio between the outer cement mixing enlarged body and the rigid pile is solved, so as to achieve the goal of greatly improving the bearing capacity and uplift resistance of the pile foundation.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical and underground engineering, and particularly relates to a high-bearing composite expanded pile with free angles. Background Art

[0002] In the field of pile foundations, the frictional force of the pile and the bearing capacity of the pile tip are two main factors affecting the bearing capacity of the pile. At present, there are two ways to increase the bearing capacity of the pile. One is to utilize the side frictional resistance of the cement-soil mixing pile and the high strength of the concrete pile core to provide the bearing capacity of the pile tip, mainly the MC stiff composite pile. The other is to form an enlarged body at the pile tip, mainly including the bored pile with enlarged head, the ramming-expanded pile, the pile tip grouting or the pile side grouting of the bored pile.

[0003] For the MC stiff composite pile, when the ratio of the core pile diameter to the cement-soil mixing pile diameter is relatively large, the area of the mixing pile cannot be considered in the bearing capacity design calculation, and the core pile area should be used for calculation, so the bearing capacity of the pile tip of the MC stiff composite pile cannot be fully exerted.

[0004] For the ramming-expanded pile, since the filling material is granular material such as concrete, construction waste and some gravels, the enlarged head formed by the filling material is a semi-rigid enlarged head. The size of the enlarged head is greatly discrete due to its construction method, and the diameter of the enlarged body cannot be accurately estimated. Therefore, the bearing capacity is unstable and discrete.

[0005] For the pile tip grouting and the pile side grouting of the bored pile, the cement grouting method is adopted. Since the cement slurry itself is a semi-rigid body, the bearing capacity cannot be fully exerted. Secondly, grouting is carried out through the grouting pipe, and the success rate of grouting cannot be guaranteed to be 100%. As a result, the bearing capacity of some engineering piles fails to meet the design requirements. In addition, the grouting volume of each pile is inconsistent, resulting in a large discreteness of the size of the formed enlarged head and unstable bearing capacity.

[0006] In addition, when there is a part of the underground structure of a building project below the surrounding soil water level, anti-pull piles need to be driven to offset the upward buoyancy generated by the water in the soil on the structure. At present, the anti-pull piles are mainly precast piles and anchor anti-pull piles. Since the precast pile is a pile body with a constant diameter, its anti-pull force is limited to the frictional resistance on the side wall of the pile body. To increase the anti-pull force, only the diameter of the precast pile can be increased, resulting in a significant increase in material costs.

[0007] The anchor anti-pull pile can only bear the anti-pull force and cannot bear the compressive force. Moreover, the anti-pull force of the anchor anti-pull pile largely depends on the grouting effect, but the grouting effect is greatly affected by manual operation. The discreteness of the grouting volume, grouting position and grouting pressure control is large, which easily leads to unstable quality of the anchor anti-pull pile.

[0008] Among the above several types of engineering piles, either there is no enlarged head, or even if there is an enlarged head, the corresponding enlarged head form generally has insufficient bearing capacity stability, large discreteness, and relatively low bearing capacity. In addition, although welding multiple shear studs on a rigid pile can increase the shear resistance and seismic resistance of the pile foundation, when the shear studs are in contact with the curved surface of the rigid pile, it will lead to inaccurate positioning. One hand of the welder positions the shear studs, and the other hand welds. It is difficult to weld a full circle at one time and often requires welding twice. Moreover, due to the large number of shear studs, the entire welding process takes longer, resulting in low efficiency in forming a rigid pile with a rigid enlarged head. Summary of the Invention

[0009] The present invention provides a free-angle high-bearing composite expanded pile to solve the problems of unstable bearing capacity of the enlarged head of the pile foundation, large discreteness, insufficient anti-pulling bearing capacity of the anti-pulling pile and large discreteness, and low efficiency when welding shear studs on the surface of the rigid pile in the related art.

[0010] The present invention provides a free-angle high-bearing composite expanded pile, which includes a cement mixing pile and a rigid pile inserted in the cement mixing pile. An irregular enlarged body is provided at the bottom of the cement mixing pile, and a rigid enlarged head is provided at the bottom of the rigid pile. The rigid enlarged head is inserted into the irregular enlarged body. The free-angle high-bearing composite expanded pile further includes holes opened on the outer wall of the rigid pile and shear studs inserted and welded in the holes. The shear studs are inserted into the cement mixing pile, and core filling concrete is poured inside the rigid pile.

[0011] The assembly between the rigid pile and the shear studs is completed by a docking device. The docking device includes a bottom plate, a rotary receiving platform intermittently rotatably arranged on the bottom plate, a limiting mechanism for limiting the rigid enlarged head outside the rigid pile, and a stud assembly mechanism for pre-inserting the shear studs on the rigid pile. The limiting mechanism is circumferentially distributed on the rotary receiving platform, and the rotary receiving platform is used to receive the rigid pile with the rigid enlarged head installed.

[0012] The limiting mechanism includes a rectangular guide groove opened on the upper surface of the rotary receiving platform. The rectangular guide groove extends along the radial direction of the rotary receiving platform, and a folded plate is slidably arranged in the rectangular guide groove. An installation plate is arranged above the folded plate, and the two are connected by a synchronous rod. A limiting block is fixedly installed on one side of the installation plate facing the axis of the rotary receiving platform.

[0013] First, a special construction drill is used to rotate and drill to form a cement mixing pile and an irregular enlarged body. Then, the assembled rigid pile, rigid enlarged head, and shear studs are inserted into the cement mixing pile and the irregular enlarged body. After the cement mixing pile and the irregular enlarged body are cured and formed, core filling concrete is poured into the rigid pile. After the core filling concrete solidifies, a free-angle high-bearing composite expanded pile is formed.

[0014] In a possible implementation manner, the rigid enlarged head includes a rigid reinforcing ring fixedly sleeved outside the rigid pile. A plurality of rigid rib plates distributed in a circumferential manner are welded to the upper surface of the rigid reinforcing ring, and the rigid rib plates are fixedly welded to the outer wall of the rigid pile. The number of the rigid enlarged heads is single or multiple distributed successively from top to bottom.

[0015] In a possible implementation manner, the rigid enlarged head includes a plurality of blades welded to the outside of the rigid pile in a circumferential distribution. Rigid rib plates are welded to the upper surface of each blade, and the rigid rib plates are fixedly welded to the outer wall of the rigid pile. The number of the rigid enlarged heads is single or multiple distributed successively from top to bottom.

[0016] In a possible implementation manner, the rigid enlarged head is a spiral structure fixed outside the rigid pile.

[0017] In a possible implementation manner, the rotary receiving platform is a circular plate-like structure. The rotary receiving platform is driven by a driving mechanism to perform intermittent rotation. The driving mechanism includes a toothed ring fixedly sleeved on the rotary receiving platform and an incomplete gear rotatably installed on the bottom plate. The toothed ring meshes with the incomplete gear, and the incomplete gear is driven to rotate by an intermittent motor.

[0018] In a possible implementation manner, the limit block is a rectangular block structure with a card slot opened on its upper surface. The card slot penetrates through the lower surface of the limit block, and one end of the card slot facing the axis of the rotary receiving platform is open, while the other end is closed. The distance between the two side walls near the closed end is equal, the distance between the two side walls near the open end gradually increases, and the side wall spacing at the opening is the largest.

[0019] In a possible implementation manner, the folded plate is connected to the inner wall of the rectangular guide groove through a return spring. A pushing mechanism for pushing the limiting mechanism is rotatably installed on the upper surface of the bottom plate. The pushing mechanism includes a ring coaxially arranged with the rotary receiving platform. Two fixed pushing bodies are fixedly arranged on the inner ring surface of the ring. The distance from the side of the fixed pushing body facing the axis of the ring to the axis of the ring gradually increases in the clockwise direction of the ring, and the fixed pushing body contacts the synchronous rod.

[0020] In a possible implementation manner, two sliding pushing bodies are slidably arranged on the inner ring surface of the ring. The two fixed pushing bodies and the two sliding pushing bodies are evenly distributed in a circumferential manner, and the fixed pushing bodies and the sliding pushing bodies are arranged alternately. The shape of the sliding pushing body is the same as that of the fixed pushing body. An arc-shaped groove is opened on the inner ring surface of the ring corresponding to the position of the sliding pushing body. The sliding pushing body is fixedly connected to a connecting block slidably arranged in the arc-shaped groove, and the connecting block is connected to the inner wall of the arc-shaped groove through an elastic cord. An arc-shaped push rod is fixedly connected to the end of the fixed pushing body farther away from the axis of the ring.

[0021] In a possible implementation manner, the stud assembling mechanism includes a rectangular accommodating cavity and a pushing outlet integrally formed on the side wall of the rectangular accommodating cavity. The pushing outlet is located on one side of the rectangular accommodating cavity close to the axis of the rotary receiving table. A sliding material table is arranged on the bottom wall of the rectangular accommodating cavity. The upper surface of the sliding material table is inclined, and the side of the sliding material table close to the pushing outlet is lower than the side far from the pushing outlet. A bottom support base is arranged on the upper surface of the pushing outlet. A cylinder is fixedly installed on one side of the rectangular accommodating cavity far from the axis of the rotary receiving table. The telescopic end of the cylinder is fixedly connected with a waist-shaped plate. Two sliding rods that slide through the rectangular accommodating cavity are fixedly connected to the side wall of the waist-shaped plate, and a U-shaped pushing seat for pushing the shear stud into the hole on the outer wall of the rigid pile is jointly installed at the ends of the sliding rods.

[0022] In a possible implementation manner, the bottom support base is L-shaped, and the inner corner of the bottom support base is rounded and provided with a magnetic layer; the U-shaped pushing seat faces the head of the shear stud placed on the bottom support base, and the two side walls of the U-shaped pushing seat are blade-shaped; a hydraulic rod that drives its lifting is fixedly connected to the bottom of the rectangular accommodating cavity, and the hydraulic rod drives it to approach or move away from the axis of the rigid pile through an external telescopic component.

[0023] One or more of the above technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0024] 1. By means of the rigid strengthening ring and the rigid rib plates, the bottom of the rigid pile becomes an enlarged head with high bearing capacity and rigid fixed dimensions, solving the technical problems of unstable bearing capacity and large discreteness, and also solving the problem of too large diameter ratio between the outer layer cement mixing enlarged body and the rigid pile.

[0025] 2. By inserting and welding shear studs on the outer wall of the rigid pile, the shear resistance, torsion resistance and seismic resistance effects of the pile foundation are increased. At the same time, due to the setting of the shear studs and the rigid enlarged head, the bearing capacity of the rigid pile is greatly improved compared with that of the ordinary rigid pile.

[0026] 3. By rotating the circular ring, the pushing body is made to push the limiting mechanism closer to the rigid rib plate, so as to quickly complete the fixation of the rigid pile. The hydraulic rod drives the stud assembling mechanism to lift and lower, so as to batch insert the shear studs into the holes on the surface of the rigid pile, avoiding the positioning deviation caused by the curved surface of the rigid pile surface during the subsequent welding of the shear studs, improving the assembling efficiency between the shear studs and the rigid pile, and further accelerating the forming efficiency of the free-angle high-bearing composite enlarged pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the free-angle high-bearing composite enlarged pile provided by the embodiment of the present invention.

[0028] Figure 2It is one of the three-dimensional structure diagrams showing the docking device provided by an embodiment of the present invention assembling shear studs on the surface of a rigid pile.

[0029] Figure 3 It is the second three-dimensional structure diagram showing the docking device provided by an embodiment of the present invention assembling shear studs on the surface of a rigid pile.

[0030] Figure 4 It is the third three-dimensional structure diagram showing the docking device provided by an embodiment of the present invention assembling shear studs on the surface of a rigid pile.

[0031] Figure 5 is Figure 4 the enlarged schematic diagram of area A in

[0032] Figure 6 It is the structural schematic diagram of the pushing mechanism provided by an embodiment of the present invention.

[0033] Figure 7 It is the sectional three-dimensional view of the pushing mechanism provided by an embodiment of the present invention.

[0034] Figure 8 It is the structural schematic diagram of the stud assembling mechanism provided by an embodiment of the present invention.

[0035] Figure 9 It is the partial sectional view of the stud organization structure provided by an embodiment of the present invention.

[0036] Figure 10 It is the schematic diagram of the state change of assembling shear studs on the surface of a rigid pile.

[0037] Figure 11 It is the schematic diagram of the connection structure between a type of rigid enlarged head and a rigid pile.

[0038] Figure 12 It is the schematic diagram of the connection structure between another type of rigid enlarged head and a rigid pile.

[0039] In the figure: 1. Cement mixing pile; 2. Special-shaped enlarged body; 3. Rigid pile; 4. Rigid enlarged head; 41. Rigid strengthening ring; 42. Rigid rib plate; 43. Blade; 5. Shear-resistant stud; 6. Core-filled concrete; 7. Bottom plate; 8. Rotary receiving platform; 9. Driving mechanism; 91. Tooth ring; 92. Incomplete gear; 10. Limiting mechanism; 101. Rectangular guide groove; 102. Folded plate; 103. Return spring; 104. Synchronous rod; 105. Mounting plate; 106. Limiting block; 107. Roller; 11. Pushing mechanism; 111. Ring; 112. Fixed pushing body; 113. Arc-shaped groove; 114. Sliding pushing body; 115. Connecting block; 116. Elastic rope; 117. Arc-shaped push rod; 118. Support column; 119. Annular guide groove; 12. Hydraulic rod; 13. Stud assembling mechanism; 131. Rectangular accommodating cavity; 132. Pushing outlet; 133. Bottom support seat; 134. Slide material table; 135. Cylinder; 136. Waist-shaped plate; 137. Slide rod; 138. U-shaped pushing seat. Detailed implementation mode

[0040] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation mode of the present invention in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementation mode disclosed below.

[0041] Please refer to Figure 1 , a free-angle high-load composite enlarged pile, including a cement mixing pile 1 and a rigid pile 3 inserted in the cement mixing pile 1. An irregular enlarged body 2 is provided at the bottom of the cement mixing pile 1, and a rigid enlarged head 4 is provided at the bottom of the rigid pile 3, and the rigid enlarged head 4 is inserted into the irregular enlarged body 2. The rigid enlarged head 4 includes a rigid strengthening ring 41 fixedly sleeved outside the rigid pile 3. A plurality of rigid rib plates 42 distributed in a circumferential manner are welded on the upper surface of the rigid strengthening ring 41, and the rigid rib plates 42 are welded and fixed to the outer wall of the rigid pile 3. A plurality of the rigid enlarged heads 4 are arranged axially upward along the rigid pile 3. Shear-resistant studs 5 are evenly arranged on the outer wall of the rigid pile 3 and above the rigid enlarged head 4, and the shear-resistant studs 5 are inserted into the cement mixing pile 1. Core-filled concrete 6 is poured inside the rigid pile 3, and the core-filled concrete 6 is micro-expansion concrete.

[0042] It should be noted that the cement mixing pile 1 and the special-shaped enlarged body 2 are completed by drilling with a special construction drill. The special construction drill consists of a free-angle rotating device, a hydraulic two-way power head, a single / double multi-spiral jet flow divider, a high-torque two-way multi-drill pipe joint, a high-pressure multi-drill pipe, and a spiral stirring alloy drill bit assembled in sequence. Among them, the free-angle rotating device can drive the hydraulic two-way power head to rotate at any angle along the axis of the cement mixing pile 1.

[0043] Refer to Figure 2 、 Figure 3 and Figure 4 , the assembly between the rigid pile 3 and the shear studs 5 is completed by a docking device. This docking device is only used for docking the shear studs 5 on the surface of the combined body of the rigid enlarged head 4 and the rigid pile 3 as shown in Figure 10 . The docking device includes a bottom plate 7, a rotary receiving table 8 rotatably arranged on the bottom plate 7, a limiting mechanism 10 for limiting the rigid enlarged head 4 outside the rigid pile 3, and a stud assembling mechanism 13 for pre-inserting the shear studs 5 on the rigid pile 3; the limiting mechanism 10 is provided with four circumferentially distributed on the rotary receiving table 8, and initially the stud assembling mechanism 13 is located on one of the limiting mechanisms 10.

[0044] Continue to refer to Figure 4 , the rotary receiving table 8 is a circular plate-like structure. The rotary receiving table 8 is driven by a driving mechanism 9 to rotate intermittently. The driving mechanism 9 includes a toothed ring 91 fixedly sleeved on the rotary receiving table 8 and an incomplete gear 92 rotatably installed on the bottom plate 7. The toothed ring 91 meshes with the incomplete gear 92. Among them, the incomplete gear 92 is driven by an intermittent motor to rotate. By driving the incomplete gear 92 to rotate with the intermittent motor, the toothed ring 91 is driven to rotate intermittently. Every time the intermittent motor drives the incomplete gear 92 to rotate two circles, the incomplete gear 92 can mesh with the toothed ring 91 and rotate 45 degrees.

[0045] Refer to Figure 4 and Figure 5, the limiting mechanism 10 includes a rectangular guide groove 101 formed on the upper surface of the rotary receiving table 8. The rectangular guide groove 101 extends along the radial direction of the rotary receiving table 8, and a folding plate 102 is slidably arranged in the rectangular guide groove 101. The folding plate 102 is connected to the inner wall of the rectangular guide groove 101 through a return spring 103. An installation plate 105 is arranged above the folding plate 102, and the two are connected through a synchronizing rod 104. A limiting block 106 is fixedly installed on one side of the installation plate 105 facing the axis of the rotary receiving table 8. The limiting block 106 is a rectangular block structure with a groove formed on its upper surface. The groove penetrates the lower surface of the limiting block 106, and one end of the groove facing the axis of the rotary receiving table 8 is open, while the other end is closed. The distance between the two side walls near the closed end is equal, the distance between the two side walls near the open end gradually increases, and the side wall spacing at the open end is the largest, that is, the two side walls near the open end are beveled. When assembling the shear stud 5 on the rigid pile 3, first lift the rigid pile 3 onto the rotary receiving table 8 by a hoisting device, and roughly align the rigid rib 42 with the groove on the limiting block 106. When the limiting block 106 approaches the rigid rib 42, when the bevel on either side touches the rigid rib 42, it will push the rigid rib 42 to drive the rigid pile 3 to rotate in the direction away from the bevel on that side, that is, a small adjustment of the rigid pile 3 is achieved. In order to reduce the friction between the bottom of the rigid pile 3 and the rotary receiving table 8 during the small adjustment process, a plurality of balls (not shown in the drawings) can be rotatably arranged on the rotary receiving table 8.

[0046] Refer to Figure 2 , Figure 6 and Figure 7, a pushing mechanism 11 for pushing the limiting mechanism 10 is rotatably installed on the upper surface of the bottom plate 7. The pushing mechanism 11 includes a ring 111 coaxial with the rotary receiving table 8. A support column 118 is installed on the lower surface of the ring 111. An annular guide groove 119 corresponding to the ring 111 is formed on the upper surface of the bottom plate 7, and the bottom end of the support column 118 is inserted into the annular guide groove 119. The annular guide groove 119 guides the movement of the support column 118. Two fixed pushing bodies 112 and two sliding pushing bodies 114 are arranged on the inner ring surface of the ring 111. The fixed pushing bodies 112 and the sliding pushing bodies 114 have the same shape. The two fixed pushing bodies 112 and the two sliding pushing bodies 114 are evenly distributed in a circle, and the fixed pushing bodies 112 and the sliding pushing bodies 114 are arranged alternately. The fixed pushing bodies 112 are fixedly connected to the inner ring surface of the ring 111. An arc-shaped groove 113 is formed on the inner ring surface of the ring 111 corresponding to the sliding pushing bodies 114. The sliding pushing bodies 114 are fixedly connected to the connecting blocks 115 slidably arranged in the arc-shaped grooves 113. The connecting blocks 115 are connected to the inner walls of the arc-shaped grooves 113 through elastic ropes 116. The distance from the side of the fixed pushing body 112 facing the axis of the ring 111 to the axis of the ring 111 gradually increases in the clockwise direction of the ring 111 (as Figure 6 indicated by the arrow).

[0047] When the ring 111 rotates clockwise, the fixed pushing body 112 rotates synchronously. During the rotation of the fixed pushing body 112, it pushes the synchronous rod 104 to move towards the axis of the rotary receiving table 8, thereby driving the limiting block 106 to approach the rigid rib 42. Furthermore, the two opposite limiting blocks 106 are used to preliminarily adjust and clamp the two rigid ribs 42 respectively. It should be noted that when the rigid rib 42 touches the closed end of the clamping groove on the limiting block 106, the two rigid ribs 42 and the limiting block 106 are clamped tightly, which is convenient for the rotary receiving table 8 to drive the rigid pile 3 to rotate together during subsequent rotation.

[0048] Refer to Figure 6 and Figure 7 , an arc-shaped push rod 117 is fixedly connected to the end of the fixed pushing body 112 farther away from the axis of the ring 111. When the fixed pushing body 112 moves, it drives the arc-shaped push rod 117 to move synchronously. When the arc-shaped push rod 117 touches the sliding pushing body 114, it will push the sliding pushing body 114 to move together. At this time, the connecting block 115 gradually stretches the elastic rope 116. The sliding pushing body 114 pushes the corresponding synchronous rod 104 towards the rigid pile 3. Although the fixed pushing body 112 and the sliding pushing body 114 have the same shape, their moving times are not synchronized. Thus, when pushing the synchronous rod 104, the synchronous rod 104 cooperating with the fixed pushing body 112 moves first, and the synchronous rod 104 cooperating with the sliding pushing body 114 moves later.

[0049] Referring to Figure 5 , in order to reduce the frictional force between both the fixed pusher 112 and the sliding pusher 114 and the synchronous rod 104, a roller 107 is rotatably sleeved on the synchronous rod 104. It should be noted that since the elastic coefficient of the return spring 103 is greater than that of the elastic cord 116, when the ring 111 rotates clockwise, the sliding pusher 114 cannot rotate synchronously with the ring 111 due to the resistance of the roller 107. Therefore, there will be a time difference in the movement of the fixed pusher 112 and the sliding pusher 114; the four limiting mechanisms 10 are used to approach the four rigid rib plates 42 synchronously in pairs respectively, so as to lock and fix the rigid pile 3.

[0050] Referring to Figure 4 , Figure 8 and Figure 9 , the stud assembling mechanism 13 includes a rectangular accommodating cavity 131 and a pushing outlet 132 integrally formed on the side wall of the rectangular accommodating cavity 131. The pushing outlet 132 is located on one side of the rectangular accommodating cavity 131 close to the axis of the rotary receiving table 8. A sliding material table 134 is arranged on the bottom wall of the rectangular accommodating cavity 131. The upper surface of the sliding material table 134 is inclined, and the side of the sliding material table 134 close to the pushing outlet 132 is lower than the side far from the pushing outlet 132. The shear studs 5 to be installed are placed on the sliding material table 134. The inclined surface design enables the shear studs 5 to roll down under the action of inertia; a bottom support seat 133 is arranged on the upper surface of the pushing outlet 132. After the shear studs 5 roll down from the sliding material table 134, they land on the bottom support seat 133. The bottom support seat 133 is L-shaped, and the inner corner of the bottom support seat 133 is rounded and provided with a magnetic layer, so as to increase the contact area and adsorption force between the bottom support seat 133 and the shear studs 5, and avoid the shear studs 5 rebounding after hitting the bottom support seat 133 when they roll down; a cylinder 135 is fixedly installed on one side of the rectangular accommodating cavity 131 far from the axis of the rotary receiving table 8. The telescopic end of the cylinder 135 is fixedly connected with a waist-shaped plate 136. Two sliding rods 137 that penetrate through the rectangular accommodating cavity 131 are fixedly connected to the side wall of the waist-shaped plate 136, and a U-shaped pushing seat 138 is jointly installed at the ends of the sliding rods 137. The U-shaped pushing seat 138 faces the head of the shear studs 5 placed on the bottom support seat 133, and the two side walls of the U-shaped pushing seat 138 are blade-shaped. When the cylinder 135 contracts and drives the sliding rods 137 to move towards the inside of the rectangular accommodating cavity 131, the U-shaped pushing seat 138 moves synchronously. One side wall of the U-shaped pushing seat 138 is inserted between two adjacent shear studs 5. When the head of the shear studs 5 contacts the inner wall of the U-shaped pushing seat 138, the shear studs 5 are synchronously pushed towards the direction of the pushing outlet 132, so as to push out the shear studs 5 currently on the bottom support seat 133.

[0051] During the entire pushing process, the side wall of the U-shaped pusher seat 138 blocks the shear studs 5 at the lowest position on the sliding table 134. When the U-shaped pusher seat 138 resets and no longer blocks the shear studs 5, the shear studs 5 at the lowest position on the sliding table 134 slide down onto the bottom support seat 133 under the action of inertia.

[0052] As Figure 10 shown, it should be noted that eight columns of holes distributed in a circular pattern are formed on the outer wall of the rigid pile 3. Four of these columns of holes correspond one-to-one with the four rigid rib plates 42. Each column includes multiple holes linearly distributed along the length direction of the rigid pile 3. Before welding the shear studs 5 to the rigid pile 3, the shear studs 5 are first inserted into the holes to avoid deviation in alignment during welding due to the curved surface of the rigid pile 3, and at the same time, it is convenient for the welder to complete the welding in one go.

[0053] Refer to Figure 2 and Figure 10 , a hydraulic rod 12 is fixedly connected to the bottom of the rectangular accommodation cavity 131. The hydraulic rod 12 drives the stud assembly mechanism 13 to move up and down, so as to insert the shear studs 5 into multiple holes in the same column one by one from top to bottom. The hydraulic rod 12 drives itself closer to or farther away from the axis of the rigid pile 3 through an external telescopic assembly (the structure of the external telescopic assembly is not shown in the figure). Initially, the fixed end of the hydraulic rod 12 is placed on the mounting plate 105 in one of the limiting mechanisms 10, and at this time, the pushing outlet 132 is aligned with the holes in the same column. After all the holes in one column are inserted with shear studs 5, the hydraulic rod 12 drives itself away from the rigid pile 3 through the external telescopic assembly. After waiting for the rigid pile 3 to rotate 45 degrees and stop, the external telescopic assembly then drives the hydraulic rod 12 closer to the rigid pile 3 to insert the shear studs 5 into the next column of holes until all the holes are inserted with shear studs 5.

[0054] The formation process of the free-angle high-load composite expanded pile is as follows: First, use docking equipment to complete the assembly of the shear studs 5 and the rigid pile 3. After each row of shear studs 5 is installed on the rigid pile 3, the rigid pile 3 and the shear studs 5 are welded together manually by arc welding until all the shear studs 5 are welded. The combination of the rigid pile 3, the rigid enlarged head 4, and the shear studs 5 is obtained. Pre-assembling the shear studs 5 on the rigid pile 3 is to avoid alignment errors when the shear studs 5 are welded on the curved surface. The specific assembly process is as follows: Lift it to the rotary receiving platform 8 by a lifting device, and roughly align the rigid rib 42 with the slot on the limit block 106. Drive the ring 111 to rotate clockwise (it can be driven by a gear drive or a sprocket chain drive). The fixed pusher 112 rotates synchronously. During the rotation of the fixed pusher 112, it pushes the roller 107 on the synchronous rod 104 to move towards the axis direction of the rotary receiving platform 8, thereby driving the limit block 106 to approach the rigid rib 42. When the groove on any side touches the rigid rib 42, it will push the rigid rib 42 to drive the rigid pile 3 to rotate away from the groove on that side, that is, a small adjustment of the rigid pile 3 is realized. When the rigid rib 42 touches the closed end of the slot on the limit block 106, the two rigid ribs 42 and the limit block 106 are clamped tightly, and the two opposite limit blocks 106 are used to preliminarily adjust and clamp the two rigid ribs 42 respectively.

[0055] When the fixed pusher 112 moves, it drives the arc-shaped push rod 117 to move synchronously. When the arc-shaped push rod 117 touches the sliding pusher 114, it will push the sliding pusher 114 to move together. At this time, the connecting block 115 gradually stretches the elastic rope 116. The sliding pusher 114 pushes the corresponding synchronous rod 104 towards the rigid pile 3. When all four rigid ribs 42 are clamped, the ring 11 stops rotating.

[0056] The external telescopic component drives the hydraulic rod 12 to approach the rigid pile 3 until the fixed end of the hydraulic rod 12 is placed on the mounting plate 105 in one of the limiting mechanisms 10. Then, when the cylinder 135 contracts and drives the sliding rod 137 to move into the rectangular accommodating cavity 131, the U-shaped push seat 138 moves synchronously. One side wall of the U-shaped push seat 138 is inserted between two adjacent shear studs 5. When the head of the shear stud 5 contacts the inner wall of the U-shaped push seat 138, the shear stud 5 is synchronously pushed towards the direction of the push-out port 132, so as to push out the shear stud 5 currently on the bottom support seat 133, and the shear stud 5 is inserted into the corresponding hole.

[0057] Afterwards, the hydraulic rod 12 drives the rectangular accommodating cavity 131 to descend by the distance between adjacent two holes each time and pauses for a short time to insert the shear studs 5. When all the holes in a row are inserted with shear studs 5, the hydraulic rod 12 drives away from the rigid pile 3 through the external telescopic assembly. At this time, after the driving mechanism 9 drives the rigid pile 3 to rotate by forty-five degrees and stop through the rotary receiving platform 8, the external telescopic assembly drives the hydraulic rod 12 to approach the rigid pile 3 again to insert the shear studs 5 into the next row of holes until all the holes are inserted with shear studs 5. Reverse-rotating the ring 11 can release the fixation of the rigid pile 3. Afterwards, the combination of the rigid pile 3, the rigid enlarged head 4 and the shear studs 5 is lifted away by a hoisting device for use.

[0058] Second, use the auxiliary boom of the external walking-type main machine equipment to move the special construction drill to the pile position, and then check and commission the special construction drill.

[0059] Third, use the special construction drill to rotate and drill to form the cement mixing pile 1 and the special-shaped enlarged body 2. The special-shaped enlarged body 2 is composed of an enlarged high-pressure jet grouting pile or a cement mixing pile 1 and a high-pressure jet grouting pile.

[0060] Fourth, use the auxiliary boom of the walking-type main machine equipment and cooperate with the pile gripper to grip the combination of the rigid pile 3, the rigid enlarged head 4 and the shear studs 5 obtained in the first step, and insert the gripped rigid pile 3 and the rigid enlarged head 4 into the cement mixing pile 1 and the special-shaped enlarged body 2 by rotating or vibrating through the hydraulic two-way power head.

[0061] Fifth, after the cement mixing pile 1 and the special-shaped enlarged body 2 are solidified and formed, cast the core filling concrete 6 into the rigid pile 3. The core filling concrete 6 is micro-expansion concrete. After the core filling concrete 6 solidifies, a free-angle high-bearing composite enlarged pile is formed.

[0062] It should be noted that the rigid pile 3 is not limited to steel pipe piles, precast piles and lattice column steel piles. In the present invention, steel pipe piles are used.

[0063] Similarly, there are also various types of rigid enlarged heads 4. Please refer to Figure 11 , the rigid enlarged head 4 can also be composed of blades 43 and rigid rib plates 42. The rigid enlarged head 4 includes a plurality of blades 43 welded to the outside of the rigid pile 3 in a circumferential distribution. A rigid rib plate 42 is welded to the upper surface of each blade 43, and the rigid rib plate 42 is welded and fixed to the outer wall of the rigid pile 3. The number of the rigid enlarged heads 4 is single or multiple distributed in sequence from top to bottom.

[0064] Please refer to Figure 12 , the rigid enlarged head 4 can also be a spiral structure fixed to the outside of the rigid pile 3.

[0065] Of course, the docking device can also Figure 11 andFigure 12 The shear studs 5 are butted on the surface of the combination of the rigid enlarged head 4 and the rigid pile 3 shown in Figure 11 The process of butting the shear studs 5 on the surface of the combination of the rigid enlarged head 4 and the rigid pile 3 in Figure 10 is the same as the process of butting the shear studs 5 on the surface of the combination of the rigid enlarged head 4 and the rigid pile 3 in Figure 12 When butting the shear studs 5 on the surface of the combination of the rigid enlarged head 4 and the rigid pile 3 shown in , it only needs to abut the limit block 106 against the surface of the rigid pile 3.

[0066] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0067] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "arranged", "connected", "installed" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection, or a sliding connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0068] The embodiments of the specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A docking device for a free-angle high-load composite expanded pile, comprising a cement mixing pile and a rigid pile inserted into the cement mixing pile. An irregular enlarged body is provided at the bottom of the cement mixing pile, and a rigid enlarged head is provided at the bottom of the rigid pile. The rigid enlarged head is inserted into the irregular enlarged body, and it is characterized in that: The free-angle high-load composite expanded pile further includes holes formed on the outer wall of the rigid pile and shear studs inserted and welded in the holes. The shear studs are inserted into the cement mixing pile, and core filling concrete is poured inside the rigid pile; Among them, the assembly between the rigid pile and the shear studs is completed by a docking device. The docking device includes a bottom plate, a rotary receiving platform intermittently rotatably arranged on the bottom plate, a limiting mechanism for limiting the rigid enlarged head outside the rigid pile, and a stud assembly mechanism for pre-inserting the shear studs on the rigid pile. The limiting mechanism is circumferentially distributed on the rotary receiving platform. Initially, the stud assembly mechanism is located on one of the limiting mechanisms, and the rotary receiving platform is used to receive the rigid pile with the rigid enlarged head installed; The limiting mechanism includes a rectangular guide groove formed on the upper surface of the rotary receiving platform. The rectangular guide groove extends along the radial direction of the rotary receiving platform, and a folded plate is slidably arranged in the rectangular guide groove. An installation plate is arranged above the folded plate, and the two are connected by a synchronous rod. A limiting block is fixedly installed on one side of the installation plate facing the axis of the rotary receiving platform; A pushing mechanism for pushing the limiting mechanism is rotatably installed on the upper surface of the bottom plate. The pushing mechanism includes a ring coaxially arranged with the rotary receiving platform. Two fixed pushing bodies are fixedly arranged on the inner ring surface of the ring. The distance from the side of the fixed pushing body facing the axis of the ring to the axis of the ring gradually increases in the clockwise direction of the ring. The fixed pushing body is in contact with the synchronous rod; Two sliding pushing bodies are slidably arranged on the inner ring surface of the ring. The two fixed pushing bodies and the two sliding pushing bodies are circumferentially and evenly distributed, and the fixed pushing bodies and the sliding pushing bodies are arranged alternately. The shape of the sliding pushing body is the same as that of the fixed pushing body. An arc-shaped groove is formed on the inner ring surface of the ring corresponding to the position of the sliding pushing body. The sliding pushing body is fixedly connected to a connecting block slidably arranged in the arc-shaped groove. The connecting block is connected to the inner wall of the arc-shaped groove by an elastic rope. One end of the fixed pushing body farther from the axis of the ring is fixedly connected to an arc-shaped push rod.

2. The docking device for a free-angle high-load composite expanded pile according to claim 1, characterized in that: The rotary receiving platform is a circular plate-like structure. The rotary receiving platform is driven to rotate intermittently by a driving mechanism. The driving mechanism includes a toothed ring fixedly sleeved on the rotary receiving platform and an incomplete gear rotatably installed on the bottom plate. The toothed ring meshes with the incomplete gear, and the incomplete gear is driven to rotate by an intermittent motor; 3. The docking device for a free-angle high-load composite expanded pile according to claim 1, characterized in that: The limiting block is a rectangular block structure with a card slot formed on the upper surface. The card slot penetrates the lower surface of the limiting block, and one end of the card slot facing the axis of the rotary receiving platform is open, and the other end is closed. The distance between the two side walls near the closed end is equal, the distance between the two side walls near the open end gradually increases, and the side wall spacing at the open end is the largest.

4. A docking device for a free-angle high-load composite expanded pile according to any one of claims 1-3, characterized in that: The folded plate is connected to the inner wall of the rectangular guide groove by a return spring.

5. The docking device for a free-angle high-load composite expanded pile according to claim 1, characterized in that: The stud assembling mechanism includes a rectangular accommodating cavity and a pushing outlet integrally formed on the side wall of the rectangular accommodating cavity. The pushing outlet is located on one side of the rectangular accommodating cavity close to the axis of the rotary receiving table. A sliding material table is arranged on the bottom wall of the rectangular accommodating cavity. The upper surface of the sliding material table is inclined, and the side of the sliding material table close to the pushing outlet is lower than the side far from the pushing outlet. A bottom support seat is arranged on the upper surface of the pushing outlet. A cylinder is fixedly installed on the side of the rectangular accommodating cavity far from the axis of the rotary receiving table. The telescopic end of the cylinder is fixedly connected with a waist-shaped plate. Two sliding rods sliding through the rectangular accommodating cavity are fixedly connected to the side wall of the waist-shaped plate, and a U-shaped pushing seat for pushing the shear stud into the hole on the outer wall of the rigid pile is jointly installed at the ends of the sliding rods.

6. The docking device for a free-angle high-load composite expanded pile according to claim 5, characterized in that: The bottom support seat is L-shaped, and the inner corner of the bottom support seat is rounded and provided with a magnetic layer; the U-shaped pushing seat faces the head of the shear stud placed on the bottom support seat, and the two side walls of the U-shaped pushing seat are knife-shaped; a hydraulic rod driven by a hydraulic rod is fixedly connected to the bottom of the rectangular accommodating cavity to drive its lifting, and the hydraulic rod drives it to approach or move away from the axis of the rigid pile through an external telescopic component.

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