Device for carrying out settlement test on pile end of cast-in-place pile by using sounding pipe

Abstract

The utility model relates to a device for carrying out a settlement test on a pile end of a cast-in-place pile by using a sounding pipe. The device comprises a clamp pressure type elastic pipe plug which comprises a bellmouth end convex groove, an elastic corrugated pipe, an arc-shaped bottom plug and the like, a rubber sealing ring is arranged in the convex groove; the sounding pipe is inserted into the socket end of the clamp pressure type elastic pipe plug, and a hydraulic clamp is used for extruding the convex groove to deform so as to form sealed connection; the sounding pipe is bound on a main reinforcement on the inner side of the reinforcement cage, and the bottom plug exceeds the pile end during binding; the side face of the conical sinker is welded with a lifting ring and bound with a steel wire rope, and the conical sinker is lowered into the sounding pipe; the sinker is connected, each section of the sinker rod is connected through a two-way joint, and the middle of each section of the rod body is sleeved with a ball type guide ring; the settlement rod penetrates through the buckle cap and extends out of the cast-in-place pile A load plate is arranged on the top of the cast-in-place pile, and holes are correspondingly formed in the load plate according to the sounding pipes; steel sheets extend from the settlement rods, standard steel beams are arranged on the peripheries of the cast-in-place piles, displacement meters are fixed to the steel beams, and probes of the displacement meters make contact with the steel sheets.

Description

Technical Field

[0001] The utility model relates to the technical field of in-situ testing of pile foundation settlement in geotechnical engineering, in particular to a device for testing the settlement of a cast-in-place pile end by using an acoustic testing tube. Background Art

[0002] Traditional pile end settlement test devices mostly use external isolation tubes and internal settlement rods, which have disadvantages such as inconvenient installation, easy bending of settlement rods, data distortion, and inability to be recycled and reused, which leads to them not being widely promoted and used. Specifically: (1) Since the external isolation tube does not reach the pile end but retreats into the pile body, there is sediment at the bottom of the tube, and the internal settlement rod cannot be inserted to the bottom of the pile; when the external isolation tube exceeds the bottom of the pile, the bottom of the tube is easily deformed and damaged by pressure; (2) When the internal settlement rod is pre-buried together with the external isolation tube, the two will bend and jam the tube together with the steel cage during the lifting process; (3) When the pile body is too long, the internal settlement rod will be close to the wall of the external isolation tube and cannot sink freely; (4) When the external isolation tube is pre-buried too much, additional holes will be opened in the pile body, which will damage the quality of the pile body. In summary, due to the shortcomings of traditional pile end settlement test devices, engineering piles are rarely used, resulting in insufficient accumulation of pile end settlement data.

[0003] In view of this, there is an urgent need to design a device for testing the end settlement of a bored pile using an acoustic detection tube. Utility Model Content

[0004] The purpose of the utility model is to provide a device for testing the end settlement of a bored pile using an acoustic detection tube, so as to improve the shortcomings of the traditional technology mentioned in the above background technology. To achieve the above purpose, the device provided by the utility model includes the following components:

[0005] The clamp-type elastic pipe plug includes a convex groove at the socket end, an elastic bellows and an arc-shaped bottom plug formed from top to bottom; wherein a rubber sealing ring is arranged in the convex groove, and the diameter of the acoustic detection pipe is smaller than the inner diameter of the socket end; the acoustic detection pipe is inserted into the socket end of the clamp-type elastic pipe plug, and the convex groove is squeezed and deformed by hydraulic pliers to form a sealed connection; the acoustic detection pipe is evenly and symmetrically tied to the main reinforcement inside the steel cage, and the bottom plug exceeds the reinforcement at the pile end during tying;

[0006] A lifting ring is welded on the side of the conical sinker and tied with a steel wire rope, and the conical sinker is lowered into the acoustic detection tube; the sinker and each section of the sinker rod are connected with a two-way joint, and a ball guide ring is sleeved in the middle of each section of the rod body; wherein the outer contour diameter of the ball guide ring is smaller than the inner diameter of the acoustic detection tube;

[0007] The settlement rod passes through the buckle cap and extends out of the top of the cast-in-place pile; the buckle cap is in an embedded ring shape, which is reversed to close the pipe opening of the acoustic detection tube, and the buckle cap is hollow and centered; wherein, the inner diameter of the buckle cap is larger than the diameter of the settlement rod, the outer diameter of the buckle cap is larger than the outer diameter of the acoustic detection tube, and the outer diameter of the embedded ring buckle is smaller than the inner diameter of the acoustic detection tube.

[0008] A load plate is installed on the top of the bored pile; wherein the load plate is opened at the corresponding position according to the acoustic detection tube, and the diameter of the hole is larger than the outer diameter of the buckle cap; a small steel sheet extends from the settlement rod, and a reference steel beam is installed on the periphery of the bored pile, and a displacement meter is fixed on the steel beam, and its probe touches the steel sheet. After the load is loaded, the load plate, fine sand cushion layer and buckle cap can be removed in turn, and the steel wire rope can be slowly lifted while removing each section of the settlement rod and the sinker for recycling and reuse.

[0009] The above-mentioned device for testing the end settlement of a bored pile by using an acoustic detection tube is characterized in that the diameter of the acoustic detection tube is 1 mm to 2 mm smaller than the inner diameter of the socket end.

[0010] The above-mentioned device for testing the end settlement of a bored pile using an acoustic detection tube is characterized in that when the clamp-type elastic pipe plug is tied, it is ensured that the bottom plugging exceeds the pile end steel bar by 3cm to 5cm.

[0011] The above-mentioned device for testing the end settlement of a bored pile by using an acoustic detection tube is characterized in that the diameter of the acoustic detection tube is 1 mm to 2 mm smaller than the inner diameter of the socket end.

[0012] The above-mentioned device for testing the pile end settlement of a bored pile using an acoustic detection tube is characterized in that the outer contour diameter of the ball-type guide ring is 1 mm smaller than the inner diameter of the acoustic detection tube.

[0013] The above-mentioned device for testing the end settlement of a bored pile using an acoustic detection tube is characterized in that the inner diameter of the buckle cap is 1mm to 2mm larger than the diameter of the settlement rod, the outer diameter of the buckle cap is 5mm larger than the outer diameter of the acoustic detection tube, and the outer diameter of the embedded ring is 2mm smaller than the inner diameter of the acoustic detection tube.

[0014] Compared with the traditional device, the beneficial effects of the utility model are:

[0015] (1) The clamp-type elastic pipe plug adopted by the utility model has a simple structure and is easy to install. It can ensure that the acoustic detection pipe is well sealed and the bottom of the pipe is elastically compressed to fit tightly against the pile bottom without damaging the bottom of the pipe.

[0016] (2) The bottom of the rear-inserted settlement rod used in the utility model is connected to a conical sinker. The entire device has a large deadweight. During the initial setting stage of concrete, the sinker is repeatedly lifted up by a steel wire rope. The mud, mortar and other sediments are squeezed out by the gravity of the entire device, so that the tip of the sinker is against the bottom plug, thereby preventing the sediment from hardening and causing the settlement rod to be unable to be inserted to the bottom.

[0017] (3) The rod body and rod top of the utility model adopt ball-type guide rings and buckle caps for correction, so that the rod can be centered and freely sink in the vertical direction, and can rotate in the horizontal direction while avoiding the rod from sticking to the wall of the acoustic detection pipe, thereby ensuring the accuracy of the pile end settlement test data.

[0018] (4) The utility model utilizes the acoustic detection tube as an external isolation tube, thereby reducing the number of reserved holes in the pile body and reducing the impact on the quality of the pile body; the entire device is easy to assemble and can be disassembled in sections for repeated use after the loading test is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 It is a structural schematic diagram of the clamp-type elastic pipe plug of the utility model.

[0021] Figure 3 It is a structural schematic diagram of the conical sinker of the utility model.

[0022] Figure 4 This is a schematic diagram of the structure of the ball guide ring of the utility model

[0023] Figure 5 It is a structural schematic diagram of the buckle cap of the utility model.

[0024] In the figure: 1-clamp-type elastic pipe plug (including 1-1 socket end convex groove, 1-2 elastic bellows, 1-3 arc bottom plug); 2-sonic detection tube; 3-conical sinker (including 3-1 lifting ring, 3-2 wire rope); 4-sinking rod; 5-bidirectional joint; 6-ball guide ring; 7-buckle (including 7-1 embedded buckle); 8-rebar cage; 9-cast pile; 10-load plate; 11-steel sheet; 12-reference steel beam; 13-displacement meter. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figures 1 to 5 The device for testing the pile tip settlement of a bored pile using an acoustic detection tube comprises the following components:

[0027] The clamp-type elastic pipe plug 1 includes a convex groove 1-1 at the socket end, an elastic bellows 1-2 and an arc-shaped bottom plug 1-3, which are integrally formed from top to bottom; wherein, a rubber sealing ring is arranged in the convex groove 1-1, and the diameter of the acoustic detection tube 2 is smaller than the inner diameter of the socket end; the elastic bellows 1-2 is sealed, and is compressed after the bottom plug 1-3 contacts the bearing layer at the pile end, and maintains close contact with the bearing layer; the acoustic detection tube 2 is inserted into the socket end of the clamp-type elastic pipe plug 1, and a sealed connection is formed after the convex groove is squeezed and deformed by hydraulic pliers. The acoustic detection tube 2 is evenly and symmetrically tied to the main reinforcement inside the steel cage 8, and when tying, ensure that the bottom plug 1-3 of the clamp-type elastic pipe plug 1 exceeds the reinforcement at the pile end;

[0028] A lifting ring 3-1 is welded on the side of the conical sinker 3 and is bound with a steel wire rope 3-2. The conical sinker 3 is slowly lowered into the acoustic detection tube 2, and a two-way joint 5 is used to connect each section of the sinking rod 4. A ball guide ring 6 is sleeved in the middle of each section of the rod body to limit the horizontal movement of the sinking rod 4; wherein the outer contour diameter of the ball guide ring 6 is smaller than the inner diameter of the acoustic detection tube 2;

[0029] The settlement rod 4 passes through the buckle cap 7 and extends out of the top of the cast-in-place pile; the buckle cap 7 is in an embedded ring shape, which is buckled in reverse to close the pipe mouth of the acoustic detection tube 2, the buckle cap 7 is hollow and centered, the inner diameter of the buckle cap 7 is larger than the diameter of the settlement rod 4, the outer diameter of the buckle cap 7 is larger than the outer diameter of the acoustic detection tube 2, and the outer diameter of the embedded ring buckle 7-1 is smaller than the inner diameter of the acoustic detection tube 2.

[0030] A load plate 10 is installed on the top of the bored pile 9; wherein, the load plate 10 is opened at the corresponding position according to the acoustic detection tube 2, and the diameter of the hole is larger than the outer diameter of the buckle cap 7; a small steel sheet 11 extends from the settlement rod 4, and a reference steel beam 12 is installed on the periphery of the bored pile 9, and a displacement meter 13 is fixed on the steel beam 12, and its probe is in contact with the steel sheet 11; after the load is loaded, the load plate 10, the fine sand cushion layer and the buckle cap 7 can be removed in turn, and the steel wire rope 3-2 can be slowly lifted while the settlement rod 4 and the sinker 3 of each section are removed for recycling and reuse.

[0031] In this example, the diameter of the acoustic detection tube 2 is 1 mm to 2 mm smaller than the inner diameter of the socket end.

[0032] In this example, when the clamp-type elastic pipe plug 1 is tied, the bottom plug 1-3 exceeds the pile end steel bar by 3cm to 5cm.

[0033] In this example, the two-way joint 5 connects the sinker 3 and each section of the sinker rod 4, and the ends of the sinker 3 and each section of the sinker rod 4 are tapped and connected to the joint thread.

[0034] In this example, the outer diameter of the ball guide ring 6 is 1 mm smaller than the inner diameter of the acoustic detection tube 2.

[0035] In this example, the inner diameter of the buckle cap 7 is 1mm to 2mm larger than the diameter of the sinker rod 4, the outer diameter of the buckle cap 7 is 5mm larger than the outer diameter of the acoustic detection tube 2, and the outer diameter of the embedded ring buckle 7-1 is 2mm smaller than the inner diameter of the acoustic detection tube 2.

[0036] In summary, the utility model utilizes the acoustic detection tube as an external isolation tube for pile end settlement test, has a simple structure and is easy to assemble, can be disassembled in sections for repeated use after completing the loading test, reduces reserved holes in the pile body, and reduces the impact on the quality of the pile body; the bottom of the clamp-type elastic tube plug is elastically compressed to fit tightly against the bottom of the pile, and the settlement rod body and rod top are guided section by section to ensure that the pile end settlement test data is accurate.

Claims

1. A device for testing the end settlement of a bored pile using an acoustic detection tube, characterized in that Includes the following components: The clamp-type elastic pipe plug (1) comprises a convex groove (1-1) at the socket end, an elastic bellows (1-2) and an arc-shaped bottom plug (1-3) which are integrally formed from top to bottom; wherein a rubber sealing ring is arranged in the convex groove (1-1), and the diameter of the acoustic detection pipe (2) is smaller than the inner diameter of the socket end; the acoustic detection pipe (2) is inserted into the socket end of the clamp-type elastic pipe plug (1), and the convex groove is squeezed and deformed by hydraulic pliers to form a sealed connection; the acoustic detection pipe (2) is evenly and symmetrically tied to the main reinforcement inside the steel cage (8), and when tying, the bottom plug (1-3) exceeds the reinforcement at the pile end; A lifting ring (3-1) is welded on the side of the conical sinker (3) and is bound with a steel wire rope (3-2), and the conical sinker (3) is lowered into the acoustic detection tube (2); the sinker (3) and each section of the sinker rod (4) are connected by a two-way joint (5), and a ball guide ring (6) is sleeved in the middle of each section of the rod body; wherein the outer contour diameter of the ball guide ring (6) is smaller than the inner diameter of the acoustic detection tube (2); The sinking rod (4) passes through the buckle cap (7) and extends out of the top of the cast-in-place pile; the buckle cap (7) is in an embedded ring shape, buckled in reverse to close the pipe opening of the sonic detection tube (2), and the buckle cap (7) is hollowed out in the middle; wherein the inner diameter of the buckle cap (7) is larger than the diameter of the sinking rod (4), the outer diameter of the buckle cap (7) is larger than the outer diameter of the sonic detection tube (2), and the outer diameter of the embedded ring buckle (7-1) is smaller than the inner diameter of the sonic detection tube (2); A load plate (10) is installed on the top of the bored pile; wherein the load plate (10) is opened at a corresponding position according to the acoustic detection tube (2), and the diameter of the opening is larger than the outer diameter of the buckle cap (7); a small steel sheet (11) extends from the settlement rod (4), a reference steel beam (12) is installed on the periphery of the bored pile (9), and a displacement meter (13) is fixed on the steel beam (12), and its probe is in contact with the steel sheet (11).

2. A device for testing the end settlement of a bored pile using an acoustic detection tube according to claim 1, characterized in that: The diameter of the acoustic detection tube (2) is 1 mm to 2 mm smaller than the inner diameter of the socket end.

3. A device for testing the end settlement of a bored pile using an acoustic detection tube according to claim 1, characterized in that: When the clamp-type elastic pipe plug (1) is tied, it is ensured that the bottom plug (1-3) protrudes 3cm to 5cm from the pile end steel bar.

4. A device for testing the end settlement of a bored pile using an acoustic detection tube according to claim 1, characterized in that: The two-way joint (5) is connected to the sinker (3) and each section of the sinker rod (4); the ends of the sinker (3) and each section of the sinker rod (4) are threadedly connected to the joint thread after being tapped.

5. A device for testing the end settlement of a bored pile using an acoustic detection tube according to claim 1, characterized in that: The outer diameter of the ball-type guide ring (6) is 1 mm smaller than the inner diameter of the acoustic detection tube (2).

6. A device for testing the end settlement of a bored pile using an acoustic detection tube according to claim 1, characterized in that: The inner diameter of the buckle cap (7) is 1 mm to 2 mm larger than the diameter of the sinker rod (4), the outer diameter of the buckle cap (7) is 5 mm larger than the outer diameter of the sonic detection tube (2), and the outer diameter of the embedded ring buckle (7-1) is 2 mm smaller than the inner diameter of the sonic detection tube (2).

7. A device for testing the end settlement of a bored pile using an acoustic detection tube according to claim 1, characterized in that: The diameter of the hole opened at the corresponding position of the load plate (10) according to the acoustic detection tube (2) is larger than the outer diameter of the buckle cap (7) by 3 mm to 5 mm.

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