Separable pile tip type pile casing supporting structure and separation construction method thereof

Abstract

The invention discloses a separable pile tip type pile casing supporting structure and a separation construction method.The separable pile tip type pile casing supporting structure comprises a pile casing, a pile tip and a chain cable, the pile tip of the pile casing is formed by splicing two pile tip bodies, and the two pile tip bodies are connected in a relatively rotating mode through a connecting piece; the connecting piece is provided with a locking part which is used for preventing the two pile tip bodies from rotating relatively after the two pile tip bodies are spliced and connected together, clamping parts are arranged on the sides, back to the tip ends, of the two pile tip bodies correspondingly, and the two clamping parts are combined to form a clamping groove when the two pile tip bodies are spliced and connected so that a pile casing can be detachably clamped; the chain cable is connected between one pile tip body and the pile casing, the pile tip can be kept connected to the pile casing when being separated from the pile casing, a relative rotation space can be provided for the two pile tip bodies, the pile tip can be separated from the pile casing, pile casing construction can be better completed, and it is ensured that sediment, soil accumulation and the like do not exist in the pile casing.

Description

Technical Field

[0001] The invention relates to the technical field of foundation treatment and pile foundation construction, and in particular to a detachable pile tip type casing support structure and a detachable construction method thereof. Background Art

[0002] During the construction of foundation treatment or pile foundation, due to the different construction processes, the requirements for the casing construction process are also different. In the existing casing construction process, drilling is performed through the pile tip fixedly connected to the casing. After the drilling is completed, the pile tip is a complete structure, and the overall diameter of the pile tip is slightly larger than the outer diameter of the casing. Therefore, there is a problem that the pile tip cannot be separated from the casing. The conventional operation is to lift the casing and the pile tip fixedly connected to the casing out of the pile hole as a whole, and then re-bury the casing in the pile hole. This construction process requires large-scale lifting machinery to operate, and the construction process is relatively cumbersome. In addition, during the process of re-burying the casing in the pile hole, it is easy for sediment and soil to fall into the casing, thereby affecting the subsequent construction of the pile body. Summary of the invention

[0003] In order to overcome the defects in the prior art, the present invention provides a detachable pile tip type casing support structure and a detachable construction method thereof, so as to better complete the casing construction and ensure that there is no sediment, soil accumulation, etc. in the casing.

[0004] In order to achieve the above object, the present invention provides a detachable pile tip type casing support structure, comprising:

[0005] A casing, wherein a first connecting end is provided at the bottom of the casing;

[0006] The pile tip is formed by splicing two pile tip bodies, the two pile tip bodies are connected relatively rotatably by a connecting piece, the connecting piece is provided with a locking part for preventing the two pile tip bodies from rotating relative to each other after being spliced ​​and connected together, the two pile tip bodies are respectively provided with a clamping part on one side facing away from the tip, the two clamping parts are combined to form a clamping groove when the two pile tip bodies are spliced ​​and connected, so that the casing can be detachably clamped, and one of the pile tip bodies is provided with a second connecting end;

[0007] A chain rope, one end of which is fixedly connected to the second connection end, and the other end of which is detachably connected to the first connection end, and the length of the chain rope is greater than the distance between the first connection end and the second connection end when the pile tip and the casing are in a clamped state, so that the pile tip can remain connected to the casing when separated from the casing, and space can be provided for relative rotation of the two pile tip bodies.

[0008] Preferably, a plurality of slot back ribs are fixedly connected between each of the clamping portions and the corresponding pile tip body.

[0009] Preferably, the connecting member includes two first connecting ear plates respectively fixedly connected to the two pile tip bodies at positions relatively close to the splicing position and fixing bolts inserted into the two first connecting ear plates, wherein the fixing bolts are inserted into the two first connecting ear plates and are used to cooperate with the locking portion to lock the two pile tip bodies after splicing and connecting them, so as to prevent the two from rotating relative to each other.

[0010] Preferably, a convex buckle protruding from the side end face of one of the pile tip bodies is provided at a joint, and a groove for the convex buckle to be inserted and connected is correspondingly provided at the joint on the side end face of the other pile tip body.

[0011] Preferably, a second connecting ear plate for fixedly connecting the other end of the chain is fixedly mounted on a surface of one of the pile tip bodies facing away from the drill bit.

[0012] A separation construction method for a detachable pile tip type casing support structure, wherein the detachable pile tip type casing support structure is separated from the casing, and the separation construction method comprises the following steps:

[0013] The two pile tip bodies are spliced ​​and connected to form a pile tip, and the two pile tip bodies that are spliced ​​and connected together are locked by a locking part to prevent the two from rotating relative to each other;

[0014] One of the pile tip bodies is connected to the casing by a chain, and the casing is connected to the pile tip by a clamping groove formed when the two pile tip bodies are spliced ​​and connected, so as to form a closed whole;

[0015] The pile hole is formed by drilling the whole body after the clamping connection, and the casing is pulled up after the drilling is completed, so that the casing is relatively separated from the pile tip under the action of the friction force with the inner wall of the pile hole, and under the action of the chain, the pile tip and the casing are separated by a certain distance and remain connected;

[0016] The locking part releases the locking of the two pile tip bodies for relative rotation, and one of the pile tip bodies is lifted by the chain rope, so that the two pile tip bodies are relatively rotated and deflected as a whole around the second connecting end, so that the width and length of the two pile tip bodies as a whole on the horizontal plane are smaller than the inner diameter of the casing;

[0017] Disassemble the other end of the chain from the casing and continue to pull the chain until the two pile tip bodies pass through the casing and are separated from the casing.

[0018] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0019] One of the pile tip bodies can be lifted by pulling the chain. During the lifting process, the other pile tip body is lifted by the fixing bolt, and the two pile tip bodies are allowed to rotate relative to each other by loosening the locking part, and finally the pile tip is separated from the casing by pulling the chain, ensuring that there is no sediment or soil accumulation in the casing. The operation is convenient, the operability of the construction process is improved, the waste of machinery and resources is reduced, and the construction efficiency is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a structural schematic diagram of a detachable pile tip type casing support structure in an embodiment of the present invention.

[0022] Figure 2 It is a schematic diagram of two pile tip bodies after relative rotation in an embodiment of the present invention.

[0023] Figure 3 It is a principle diagram of lifting two pile tip bodies to make them rotate relative to each other and separate them from the casing in an embodiment of the present invention.

[0024] The corresponding relationship of the numbers in the accompanying drawings is as follows:

[0025] 1-casing; 2-pile tip body; 21-first pile tip body; 22-second pile tip body; 201-drill bit; 202-slot; 203-slot back rib; 204-first connecting ear plate; 205-second connecting ear plate; 206-bump; 207-groove; 3-chain; 4-fixing bolt; A-position of the free end of the pile tip body before lifting; B-position of the free end of the first pile tip body after lifting and rotation; B1-position of the free end of the second pile tip body after lifting and rotation; a-direction of rotation of the first pile tip body; b-direction of rotation of the second pile tip body; H-distance between the outer end points when the pile tip bodies are spliced; h-distance between the outer end points after lifting and rotation; O-center of rotation of the two pile tip bodies when they rotate relative to each other. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] See also Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a detachable pile tip type casing support structure, comprising a casing 1, a pile tip and a chain 3, wherein the pile tip is detachably clamped on the casing 1, a first connecting end is provided at the bottom of the casing 1, the pile tip is composed of two pile tip bodies 2, the two pile tip bodies 2 are relatively rotatably connected by a connecting member, a locking portion is provided on the connecting member for preventing the two pile tip bodies 2 from rotating relative to each other after being spliced ​​and connected together, a clamping portion is provided on the two pile tip bodies 2 on one side facing away from the tip, the two clamping portions are combined to form a clamping groove 202 when the two pile tip bodies 2 are spliced ​​and connected, so that the casing 1 can be detachably clamped, and a second connecting end is provided on one of the pile tip bodies 2; one end of the chain 3 is fixedly connected to the second connecting end, and the other end is detachably connected to the first connecting end, and the length of the chain 3 is greater than the distance between the first connecting end and the second connecting end when the pile tip and the casing 1 are in the clamping state, so that the pile tip can remain connected to the casing 1 when separated from the casing 1, and a space for relative rotation can be provided for the two pile tip bodies 2. It should be noted that in this embodiment, the shape of the pile tip body 2 is a solid cone, and the tip is a drill bit 201. The drill bit 201 adopts a diamond drill bit. The use of a diamond drill bit can ensure that hard stones such as crusher rocks are broken during drilling. The connection part between the slot 202 and the casing 1 is set to a slope type to ensure that the casing 1 can be smoothly engaged and connected to the slot 202.

[0028] Further, in this embodiment, a plurality of slotted back ribs 24 are fixedly connected between each clamping portion and the corresponding pile tip body 2 to avoid deformation and damage due to stress. Preferably, the connecting member includes first connecting ear plates 204 respectively fixedly connected to the two pile tip bodies 2 at positions relatively close to the splicing position and fixing bolts 4 inserted into the two first connecting ear plates 204, the fixing bolts 4 are inserted into the two pile tip bodies 2 and are used to cooperate with the locking portion to lock the two pile tip bodies 2 after splicing and connecting, so as to prevent the two from rotating relative to each other. It should be noted that in this embodiment, the locking portion can be a nut matched with the fixing bolt 4, and by loosening the fixing bolt 4 and the nut, one of the pile tip bodies 2 can be rotated counterclockwise relative to the other pile tip body 2.

[0029] Furthermore, a convex buckle 206 protruding from the side end face of one of the pile tip bodies 2 is provided at the joint, and a groove 207 for the convex buckle 206 to be inserted and connected is correspondingly provided at the joint on the side end face of the other pile tip body. In this embodiment, the convex buckle 206 is semi-cylindrical in shape and is provided at the upper part of the side end face of one of the pile tip bodies 2. Correspondingly, the groove 207 is also semi-cylindrical in shape and is provided at the upper part of the side end face of the other pile tip body 2. When the two pile tip bodies 2 rotate relative to each other, they will not affect each other. Preferably, a second connecting ear plate 205 for the other end of the chain 3 to be fixedly connected is fixedly installed on the surface of one of the pile tip bodies 2 facing away from the drill bit 204.

[0030] See also Figure 1 As shown, in this embodiment, the pile tip is composed of a first pile tip body 21 and a second pile tip body 22 which are relatively rotatably connected, and the side end surface of the first pile tip body 21 is provided with a convex buckle 206 protruding from the side end surface at the splicing position, and the side end surface of the second pile tip body 22 is correspondingly provided with a groove 207 for the convex buckle 206 to be inserted and connected at the splicing position. Preferably, a second connecting ear plate 205 for the other end of the chain 3 to be fixedly connected is fixedly installed on the surface of the first pile tip body 21 on the side facing away from the drill bit.

[0031] The embodiment of the present invention further provides a separation construction method of a detachable pile tip type casing support structure, wherein the separation from the casing is achieved by the detachable pile tip type casing support structure, and the separation construction method comprises the following steps:

[0032] The two pile tip bodies are spliced ​​and connected to form a pile tip, and the two pile tip bodies that are spliced ​​and connected together are locked by a locking part to prevent the two from rotating relative to each other;

[0033] One of the pile tip bodies (the first pile tip body in this embodiment) is connected to the casing by a chain, and the casing is connected to the pile tip by snapping the slot formed when the two pile tip bodies are spliced ​​and connected, so as to form a closed whole;

[0034] The pile hole is formed by drilling the whole body after the clamping connection, and the casing is pulled up after the drilling is completed, so that the casing is relatively separated from the pile tip under the action of the friction force with the inner wall of the pile hole, and under the action of the chain, the pile tip and the casing are separated by a certain distance and remain connected;

[0035] The locking part unlocks the relative rotation of the two pile tips assembled with each other, and one of the pile tip bodies (the first pile tip body in this embodiment) is lifted by the chain rope, so that the two pile tip bodies rotate relative to each other and deflect as a whole around the second connecting end, so that the width and length of the two pile tip bodies as a whole on the horizontal plane are both smaller than the inner diameter of the casing;

[0036] Disassemble the other end of the chain from the casing and continue to pull the chain until the two pile tip bodies pass through the casing and are completely separated from the casing.

[0037] See also Figures 1 to 3 As shown, Figure 1 is the position of the two pile tip bodies before the pile tip body is lifted (the symbol A represents the position of the end points of the pile tip body in the horizontal state). At this position, the distance between the outer end points of the pile tip bodies when they are spliced ​​is H. Figure 2is the position of the first pile tip body and the second pile tip body after the lifting rotation (the label B represents the position of the end point of the first pile tip body after rotating in the direction a, and B1 represents the position of the end point of the second pile tip body after rotating in the direction b), such as Figure 3 As shown, the first pile tip body 21 is lifted by the chain, and the first pile tip body 21 rotates in the direction a to the position B around the rotation center relatively fixed by the fixing bolts (the reference numeral O represents the rotation center when the two pile tip bodies rotate relative to each other), and the second pile tip body 22 rotates in the direction b to the position B1 around the rotation center relatively fixed by the fixing bolts of the first pile tip body 21. At this time, the distance between the outer end points is h, and h is smaller than the inner diameter of the casing. At this time, the second pile tip body 22 deflects as a whole with the second connecting end (i.e., the connection between the chain and the second connecting ear plate) as the center, so that the width and length of the two pile tip bodies as a whole on the horizontal plane are smaller than the inner diameter of the casing, so that they can pass through the casing and be completely separated from the casing.

[0038] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A detachable pile tip casing support structure, characterized in that: include: A casing, wherein a first connecting end is provided at the bottom of the casing; A pile tip is formed by splicing two pile tip bodies, the two pile tip bodies are connected relatively rotatably by a connecting piece, the connecting piece is provided with a locking part for preventing the two pile tip bodies from rotating relative to each other after being spliced ​​and connected together, the two pile tip bodies are respectively provided with a clamping part on one side facing away from the tip, the two clamping parts are combined to form a clamping groove when the two pile tip bodies are spliced ​​and connected, so that the casing can be detachably clamped, and one of the pile tip bodies is provided with a second connecting end; A chain rope, one end of which is fixedly connected to the second connection end, and the other end of which is detachably connected to the first connection end, and the length of the chain rope is greater than the distance between the first connection end and the second connection end when the pile tip and the casing are in a clamped state, so that the pile tip can remain connected to the casing when separated from the casing, and space can be provided for relative rotation of the two pile tip bodies.

2. The detachable pile tip casing support according to claim 1, characterized in that: A plurality of slot back ribs are fixedly connected between each of the clamping parts and the corresponding pile tip body.

3. The detachable pile tip casing support structure according to claim 2, characterized in that: The connecting member includes first connecting ear plates respectively fixedly connected to the two pile tip bodies at positions relatively close to the splicing position and fixing bolts inserted into the two first connecting ear plates. The fixing bolts are inserted into the two first connecting ear plates and are used to cooperate with the locking part to lock the two pile tip bodies after splicing and connecting them, so as to prevent the two from rotating relative to each other.

4. The detachable pile tip casing support structure according to claim 1, characterized in that: A convex buckle protruding from the side end face of one of the pile tip bodies is provided at a joint, and a groove for the convex buckle to be inserted and connected is correspondingly provided at the joint on the side end face of the other pile tip body.

5. The detachable pile tip casing support structure according to claim 1, characterized in that: A second connecting ear plate for fixedly connecting the chain is fixedly installed on a surface of one of the pile tip bodies facing away from the tip.

6. A separation construction method for a detachable pile tip casing support structure, characterized in that: The separation of the pile tip and the casing is achieved by the detachable pile tip casing support structure as claimed in claim 1, and the separation construction method comprises the following steps: The two pile tip bodies are spliced ​​and connected to form a pile tip, and the two pile tip bodies that are spliced ​​and connected together are locked by a locking part to prevent the two from rotating relative to each other; One of the pile tip bodies is connected to the casing by a chain, and the casing is connected to the pile tip by a clamping groove formed when the two pile tip bodies are spliced ​​and connected, so as to form a closed whole; The pile hole is formed by drilling the whole body after the clamping connection, and the casing is pulled up after the drilling is completed, so that the casing is relatively separated from the pile tip under the action of the friction force with the inner wall of the pile hole, and under the action of the chain, the pile tip and the casing are separated by a certain distance and remain connected; The locking part releases the locking of the two pile tip bodies for relative rotation, and one of the pile tip bodies is lifted by the chain rope, so that the two pile tip bodies are relatively rotated and deflected as a whole around the second connecting end, so that the width and length of the two pile tip bodies as a whole on the horizontal plane are smaller than the inner diameter of the casing; Disassemble the other end of the chain from the casing and continue to pull the chain until the two pile tip bodies pass through the casing and are completely separated from the casing.

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