Precast engineering pile pull-out test device

Abstract

The utility model provides a prefabricated engineering pile anti-pulling test device which comprises buttresses, a cross beam and a test device, the two ends of the cross beam are placed on the left buttress and the right buttress respectively, the upper end of the test device is installed on the cross beam, the lower end of the test device is used for being connected with a prefabricated engineering pile between the two buttresses, and a bottom plate of the test device is used for being placed on the cross beam. A pressure sensor is mounted on the bottom plate, a jack is mounted at the top of the pressure sensor, a top plate is mounted at the top of the jack, a plurality of pull rods are arranged, the upper ends of the pull rods penetrate through the top plate and then are screwed with nuts, and the lower ends of the pull rods penetrate through the bottom plate, then penetrate through lifting holes of hoops and then are screwed with nuts; the device further comprises a measuring datum device which is installed on the prefabricated engineering pile. And by arranging the pressure sensor and the measuring datum device, displacement data of the prefabricated engineering pile under the condition that the test tension is met can be conveniently measured.

Description

Technical Field

[0001] The utility model relates to the technical field of civil construction, in particular to a prefabricated engineering pile pull-out test device. Background Art

[0002] In pile foundation engineering, there are often two types of piles involved, one is concrete cast-in-place piles, and the other is precast piles. For precast piles, after the construction of the precast piles is completed, the piles are subjected to pull-out tests according to design requirements.

[0003] Chinese patent document CN220202781U, publication / announcement date: 2023.12.19, discloses an end sleeve type prefabricated pipe pile pull-out detection device, including a steel beam, a jack, a pull-out end sleeve, a pull-out anchor plate, a force-bearing rod, a first fastener and a second fastener. The pull-out end sleeve is fixedly sleeved on the pipe pile flange, and a plurality of first through holes are axially provided on the outer periphery of the pull-out end sleeve. The pull-out anchor plate is placed on the steel beam, and a plurality of second through holes are provided on the pull-out anchor plate. A plurality of force-bearing rods are axially arranged between the pull-out end sleeve and the pull-out anchor plate. The lower end of the force-bearing rod extends from the first through hole, and the upper end extends from the second through hole. The first fastener and the second fastener are respectively installed on the lower end and the upper end of the force-bearing rod. Its characteristics are that the device can greatly shorten the installation time of the pull-out test of pipe piles, effectively save construction period and reduce costs, and can also avoid defects caused by welding quality problems and improve the success rate of the test; its shortcomings are, first, in actual construction, the height of the precast pile will not be located exactly below the steel beam of the test device, and the top of the precast pile may be much higher than the ground, and the precast pile often needs to be cut off. After the precast pile is cut off, the flange on the top is also cut off, which will cause the problem that the pull-out end sleeve cannot be installed; second, during the test, it is necessary to obtain the displacement data under the specified tension, so it is necessary to measure the applied tension and the displacement of the precast engineering pile. The patent document does not involve a solution for measuring tension and displacement. Utility Model Content

[0004] The technical problem to be solved by the utility model is: to solve the problems existing in the above-mentioned background technology, and to provide a prefabricated engineering pile pull-out test device, in which the prefabricated engineering pile is clamped by a clamp, a pressure sensor is installed between the jack and the crossbeam to measure the thrust of the jack, and a measurement reference device is installed on the prefabricated engineering pile, so as to measure the displacement data of the prefabricated engineering pile in the test.

[0005] In order to achieve the above technical features, the purpose of the present utility model is realized as follows: A pull-out test device for precast engineering piles includes abutments, a cross beam, and a test device. The two ends of the cross beam are respectively placed on the left and right abutments. The upper end of the test device is installed on the cross beam, and the lower end is used to connect with the precast engineering pile between the two abutments. The test device includes a bottom plate, a pressure sensor, a jack, a top plate, a pull rod, and a hoop. The bottom plate is used to be placed on the cross beam. A pressure sensor is installed on the bottom plate. A jack is installed on the top of the pressure sensor. The top of the jack is installed with a top plate. There are multiple pull rods. The upper end of the pull rod passes through the top plate and is screwed with a nut. The lower end of the pull rod passes through the bottom plate and then passes through the lifting hole of the hoop and is also screwed with a nut; It also includes a measurement reference device, which is installed on the precast engineering pile and is used to measure the displacement data of the precast engineering pile during the test.

[0006] Baffles are respectively arranged on both sides of the lower side surface of the bottom plate where it is located on the cross beam.

[0007] A first limiting ring is arranged in the middle of the upper side surface of the bottom plate, and the lower end of the pressure sensor is placed in the first limiting ring.

[0008] A support plate is also installed on the top of the pressure sensor. The jack is placed on the support plate. A limiting post is arranged on the lower side surface of the support plate, and the limiting post is inserted downward into the pressure sensor.

[0009] Guide rods are respectively slid downward through the four corners of the support plate, and the lower ends of the guide rods are screwed and positioned with the bottom plate.

[0010] A second limiting ring is arranged on the upper side surface of the support plate, and a third limiting ring is arranged on the lower side of the top plate. The lower end of the jack is placed in the second limiting ring, and the upper end of the jack is located in the third limiting ring.

[0011] The hoop includes two half rings. Both half rings include an arc plate, a locking part, and a lifting part. The arc plate is used to fit with the outer wall of the precast engineering pile. Locking parts are respectively fixedly arranged on the outer walls at both ends of the arc plate. Lifting parts are respectively fixedly arranged on the outer wall of the arc plate near the two locking parts on both sides. A longitudinal lifting hole is arranged on the lifting part. The two lifting parts on the same side half ring are connected by a reinforcing plate. At the same time, a plurality of reinforcing ribs are fixedly connected between the locking part and the lifting part on the same side half ring. A plurality of locking holes are horizontally and correspondingly arranged on the locking parts of the two half rings. The locking bolts pass through the locking holes on both sides to hold the precast engineering pile.

[0012] The measurement reference device includes an annular hoop, and a reference plate is fixedly connected to the annular hoop.

[0013] It also includes a lifting seat, a universal magnetic seat bracket and a displacement measuring device. The universal magnetic seat bracket is magnetically attracted to the lifting seat. The universal magnetic seat bracket is equipped with a displacement measuring device. The displacement measuring device cooperates with a reference plate to measure the displacement data of the prefabricated engineering piles in the test.

[0014] The displacement measuring device includes a displacement sensor, or a laser distance measuring sensor, or a micrometer.

[0015] The utility model has the following beneficial effects:

[0016] 1. The utility model holds the prefabricated engineering pile tightly by a clamp, and a pressure sensor is installed between the jack and the crossbeam to measure the thrust of the jack. The lower end of the pull rod passes through the bottom plate, and the sliding guide of the pull rod and the bottom plate cooperates to improve the stability of the device between the bottom plate and the top plate. A measuring reference device is installed on the prefabricated engineering pile, so that the displacement data of the prefabricated engineering pile under the test tension can be measured.

[0017] 2. The utility model has a support plate installed on the top of the pressure sensor to improve the stability of the structure. In addition, the support plate is connected to the bottom plate through a guide rod, so that the bottom plate, the pressure sensor and the support plate form an integral structure.

[0018] 3. The utility model also includes a lifting seat, a universal magnetic seat bracket and a displacement measuring device. The universal magnetic seat bracket is magnetically attracted to the lifting seat. The universal magnetic seat bracket is equipped with a displacement measuring device. The displacement measuring device cooperates with the reference plate to measure the displacement data of the prefabricated engineering piles in the test, making the displacement measurement more convenient and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] Figure 2 for Figure 1 Schematic diagram of the AA section structure.

[0022] Figure 3 This is a schematic diagram of the main structure of the clamp of the utility model.

[0023] Figure 4 It is a schematic diagram of the structure of the clamp of the utility model from a top view.

[0024] Figure 5 It is a schematic diagram of the structure of the measurement reference device of the utility model.

[0025] Figure 6 It is a schematic diagram of the structure of the lifting seat, the universal magnetic seat bracket and the displacement measuring device of the utility model.

[0026] In the figure, there are pier 10, cross beam 20, test device 30, bottom plate 31, baffle 311, first limit ring 312, pressure sensor 32, support plate 33, limit post 331, guide rod 332, second limit ring 333, jack 34, top plate 35, third limit ring 351, tie rod 36, nut 361, hoop 37, arc plate 371, locking part 372, lifting part 373, lifting hole 374, tightening hole 375, reinforcing rib 376, reinforcing plate 377, locking bolt 378, precast engineering pile 40, lifting seat 50, base 51, longitudinal rod 52, sliding sleeve 53, adjusting plate 54, measurement reference device 60, annular hoop 61, reference plate 62, universal magnetic base bracket 70, displacement measurement device 80. Specific implementation mode

[0027] The following further describes the implementation mode of the present utility model with reference to the accompanying drawings.

[0028] See Figures 1-6 , a pull-out test device for precast engineering piles, including pier 10, cross beam 20 and test device 30. The two ends of cross beam 20 are respectively placed on the left and right piers 10. The upper end of test device 30 is installed on cross beam 20, and the lower end is used to connect with the precast engineering pile 40 between the two piers 10. The test device 30 includes bottom plate 31, pressure sensor 32, jack 34, top plate 35, tie rod 36 and hoop 37. The bottom plate 31 is used to be placed on the cross beam 20. A pressure sensor 32 is installed on the bottom plate 31. A jack 34 is installed on the top of the pressure sensor 32. A top plate 35 is installed on the top of the jack 34. There are multiple tie rods 36. After the upper end of the tie rod 36 passes through the top plate 35, a nut 361 is screwed on. The lower end of the tie rod 36 passes through the bottom plate 31, and then passes through the lifting hole 374 of the hoop 37 and is also screwed with a nut 361. It also includes a measurement reference device 60, which is installed on the precast engineering pile 40 and is used to measure the displacement data of the precast engineering pile 40 during the test.

[0029] During use, the jack 34 is connected to the hydraulic pump station pipeline. The pressure sensor 32 is electrically connected to the display control instrument and is used to display the magnitude of the thrust of the jack 34. After the hydraulic oil enters the rodless cavity of the jack 34, it pushes the top plate 35 upward. The top plate 35 lifts the hoop 37 through the four tie rods 36, so as to conduct a pull-out test on the precast engineering pile 40. The measurement reference device 60 is used to cooperate with the measurement device to measure the displacement of the precast engineering pile 40.

[0030] The precast engineering pile 40 is tightly held by the hoop 37. A pressure sensor 32 is installed between the jack 34 and the crossbeam 20 to measure the thrust of the jack 34, and a measurement reference device 60 is installed on the precast engineering pile 40, so as to measure the displacement data of the precast engineering pile 40 under the test tension.

[0031] Wherein, the lower end of the tie rod 36 passes through the bottom plate 31, and through the sliding and guiding cooperation between the tie rod 36 and the bottom plate 31, the stability of the device between the bottom plate 31 and the top plate 35 is improved.

[0032] Specifically, the pressure sensor 32 can adopt a columnar sensor of Shenzhen Lizhun Sensing Technology Co., Ltd., model LF-601, and the display control instrument is of the same factory supporting model TD-700T.

[0033] See Figure 2 , baffles 311 are respectively arranged on both sides of the lower side of the bottom plate 31 where the crossbeam 20 is located, which are used to limit the bottom plate 31, so that the center of the bottom plate 31 can be quickly roughly aligned with the central axis of the crossbeam 20.

[0034] Furthermore, a first limiting ring 312 is arranged in the middle of the upper side of the bottom plate 31, and the lower end of the pressure sensor 32 is placed in the first limiting ring 312, which is used to limit the position of the pressure sensor 32. Preferably, the first limiting ring 312 is welded to the bottom plate 31.

[0035] See Figure 2 , since the stability of the jack 34 directly placed on the pressure sensor 32 is poor, a support plate 33 is also installed on the top of the pressure sensor 32. The jack 34 is placed on the support plate 33. A limiting post 331 is arranged on the lower side of the support plate 33, and the limiting post 331 is inserted downward into the pressure sensor 32 to limit the support plate 33 and the pressure sensor 32. It should be noted that the top of the columnar sensor of model LF-601 has a round hole.

[0036] Furthermore, guide rods 332 are respectively slid downward through the four corners of the support plate 33, and the lower ends of the guide rods 332 are rotationally connected and positioned with the bottom plate 31. The support plate 33 is connected to the bottom plate 31 through the guide rods 332, so that the bottom plate 31, the pressure sensor 32 and the support plate 33 form an integral structure. Specifically, the guide rods 332 adopt bolts. The heads of the bolts limit the support plate 33, and the guide rods 332 are slidably connected to the support plate 33. Nuts are screwed on the upper side of the bottom plate 31 for the guide rods 332 to fix the guide rods 332. It should be noted that there is a gap between the head at the upper end of the guide rod 332 and the upper side of the support plate 33, and the guide rod 332 is set not to squeeze the pressure sensor 32.

[0037] Further, a second limiting ring 333 is provided on the upper side of the support plate 33, and a third limiting ring 351 is provided on the lower side of the top plate 35. The lower end of the jack 34 is placed within the second limiting ring 333, and the upper end of the jack 34 is located within the third limiting ring 351. By providing the second limiting ring 333 and the third limiting ring 351, the jack 34 is thus limited.

[0038] See Figure 3 、 4 , the hoop 37 includes two half-rings, and both half-rings include an arc-shaped plate 371, a locking portion 372, and a lifting portion 373. The arc-shaped plate 371 is used to fit against the outer wall of the precast engineering pile 40. Locking portions 372 are respectively and fixedly provided on the outer walls at both ends of the arc-shaped plate 371. Lifting portions 373 are respectively and fixedly provided on the outer wall of the arc-shaped plate 371 at positions close to the two locking portions 372 on both sides. Longitudinal lifting holes 374 are provided on the lifting portions 373. The two lifting portions 373 on the same side of the half-ring are connected by a reinforcing plate 377. At the same time, a plurality of reinforcing ribs 376 are fixedly connected between the locking portion 372 and the lifting portion 373 on the same side of the half-ring. A plurality of locking holes 375 are horizontally and correspondingly provided on the locking portions 372 of the two half-rings. The locking bolts 378 pass through the locking holes 375 on both sides to hold the precast engineering pile 40. With the above structure, the half-ring has higher structural strength, thereby holding the precast engineering pile 40 more stably. Of course, in order to increase the friction force, raised patterns can also be provided inside the arc-shaped plate 371.

[0039] In a preferred embodiment, see Figure 5 , the measurement reference device 60 includes an annular hoop 61, and a reference plate 62 is fixedly connected to the annular hoop 61, which is convenient for structural installation. During use, the annular hoop 61 is installed on the top end of the precast engineering pile 40 through bolts, and the displacement of the precast engineering pile 40 is measured through the reference plate 62.

[0040] In addition to the above solution, the measurement reference device 60 can also adopt other structures. For example, a top cover, a structure similar to a hat, can be installed on the top of the precast engineering pile 40, and the displacement is measured through the plane on the top of the top cover.

[0041] For example, a scale is placed on the top of the reference plate 62 or the top cover, and the scale on the scale is observed through a level. By observing the change in the scale readings during the first observation and the final observation, the displacement data can be obtained.

[0042] Since the measurement error using a level and a scale is relatively large and inconvenient, see Figure 1 、 6, further comprising a lifting seat 50, a universal magnetic seat bracket 70 and a displacement measuring device 80. The universal magnetic seat bracket 70 is magnetically attracted to the lifting seat 50, and the displacement measuring device 80 is installed on the universal magnetic seat bracket 70. The displacement measuring device 80 cooperates with the reference plate 62 to measure the displacement data of the precast engineering pile 40 during the test.

[0043] Preferably, the displacement measuring device 80 includes a displacement sensor, or a laser distance measuring sensor, or a micrometer.

[0044] The lifting seat 50 is used to be placed on the ground beside the precast engineering pile 40 and as far away from the precast engineering pile 40 as possible. Specifically, Figure 6 in, the lifting seat 50 includes a base 51, a longitudinal rod 52 and an adjusting plate 54. The longitudinal rod 52 is fixedly installed on the base 51. A sliding sleeve 53 is fixedly connected to the adjusting plate 54. The sliding sleeve 53 is slidably sleeved on the longitudinal rod 52. A hand-tightening bolt is screwed on the sliding sleeve 53. When the hand-tightening bolt abuts against the longitudinal rod 52, the sliding sleeve 53 is limited with the longitudinal rod 52. The universal magnetic seat bracket 70 is magnetically attracted to the adjusting plate 54. The displacement measuring device 80 is installed on the universal magnetic seat bracket 70. The light beam or the measuring rod of the displacement measuring device 80 is aligned with the reference plate 62 to measure the displacement of the precast engineering pile 40. The universal magnetic seat bracket 70 is a prior art and can be purchased on the market.

[0045] Preferably, the displacement sensor adopts a differential displacement sensor with a telescopic rod. During use, the telescopic rod abuts against the reference plate 62 or the top of the top cover.

[0046] The use of the displacement sensor and the laser distance measuring sensor and the reading of the data are prior arts and will not be elaborated here.

[0047] The working process or principle of the present utility model is as follows:

[0048] During use, assemble and connect the precast engineering pile uplift test device of the present application according to the structure shown in Figure 1 , 2 . Place the lifting seat 50 on the ground beside the precast engineering pile 40, adjust the height of the adjusting plate 54, magnetically attract the universal magnetic seat bracket 70 to the adjusting plate 54. A micrometer is installed on the universal magnetic seat bracket 70. The telescopic dial rod of the micrometer abuts against the reference plate 62, and rotate the dial to align the zero of the dial scale with the pointer.

[0049] During the test, hydraulic oil enters the rodless cavity of the jack 34, and the jack 34 pushes the top plate 35 upward. The lower end will also squeeze the pressure sensor 32, and the pressure data, that is, the tensile force data of the precast engineering pile 40, can be obtained through the supporting display control instrument, so as to confirm whether the test tensile force is reached. At the same time, the top plate 35 lifts the hoop 37 through four tie rods 36, so as to conduct the uplift test on the precast engineering pile 40. During the test project, if there is an upward displacement of the precast engineering pile 40, it will push up the rod of the dial gauge, and the displacement data can be measured through the dial gauge.

Claims

1. A pull-out test device for precast engineering piles, comprising abutments (10), a cross beam (20) and a test device (30). The two ends of the cross beam (20) are respectively placed on the left and right abutments (10). The upper end of the test device (30) is installed on the cross beam (20), and the lower end is used to connect with a precast engineering pile (40) between the two abutments (10), characterized in that: The test device (30) includes a bottom plate (31), a pressure sensor (32), a jack (34), a top plate (35), a tie rod (36), and a hoop (37). The bottom plate (31) is used to be placed on the cross beam (20). The pressure sensor (32) is installed on the bottom plate (31). The top of the pressure sensor (32) is installed with a jack (34). The top of the jack (34) is installed with a top plate (35). A plurality of tie rods (36) are provided. The upper end of the tie rod (36) passes through the top plate (35) and is screwed with a nut (361). The lower end of the tie rod (36) passes through the bottom plate (31), and then passes through the lifting hole (374) of the hoop (37) and is also screwed with a nut (361). It further includes a measurement reference device (60), which is installed on the precast engineering pile (40) and is used to measure the displacement data of the precast engineering pile (40) during the test.

2. The anti-pulling test device for a precast engineering pile according to claim 1, characterized in that: Baffles (311) are respectively arranged on both sides of the lower side surface of the bottom plate (31) where the cross beam (20) is located.

3. The anti-pulling test device for precast engineering piles according to claim 1, characterized in that: A first limit ring (312) is arranged in the middle of the upper side surface of the bottom plate (31), and the lower end of the pressure sensor (32) is placed in the first limit ring (312).

4. The precast engineering pile uplift test device according to claim 1 or 3, characterized in that: A support plate (33) is further installed on the top of the pressure sensor (32). The jack (34) is placed on the support plate (33). A limit post (331) is arranged on the lower side surface of the support plate (33), and the limit post (331) is inserted downward into the pressure sensor (32).

5. The precast engineering pile uplift test device according to claim 4, characterized in that: Guide rods (332) respectively penetrate downward and slidably at the four corners of the support plate (33), and the lower ends of the guide rods (332) are screwed and positioned with the bottom plate (31).

6. The precast engineering pile uplift test device according to claim 4, characterized in that: A second limit ring (333) is arranged on the upper side surface of the support plate (33), and a third limit ring (351) is arranged on the lower side of the top plate (35). The lower end of the jack (34) is placed in the second limit ring (333), and the upper end of the jack (34) is located in the third limit ring (351).

7. The anti-pulling test device for precast engineering piles according to claim 1, wherein: The hoop (37) includes two semi - rings. Both semi - rings include an arc plate (371), a locking part (372), and a lifting part (373). The arc plate (371) is used to fit with the outer wall of the precast engineering pile (40). Locking parts (372) are respectively and fixedly arranged on the outer walls at both ends of the arc plate (371). Lifting parts (373) are respectively and fixedly arranged on the outer wall of the arc plate (371) at positions close to the two locking parts (372) on both sides. A longitudinal lifting hole (374) is arranged on the lifting part (373). The two lifting parts (373) on the same side semi - ring are connected by a reinforcing plate (377). At the same time, a plurality of reinforcing ribs (376) are fixedly connected between the locking part (372) and the lifting part (373) on the same side semi - ring. A plurality of locking holes (375) are horizontally and correspondingly arranged on the locking parts (372) of the two semi - rings. A locking bolt (378) passes through the locking holes (375) on both sides to hold the precast engineering pile (40).

8. The precast engineering pile uplift test device according to claim 1, characterized in that: The measurement reference device (60) includes an annular hoop (61), and a reference plate (62) is fixedly connected to the annular hoop (61).

9. The precast engineering pile uplift test device according to claim 8, characterized in that: It further includes a lifting seat (50), a universal magnetic seat bracket (70) and a displacement measuring device (80). The universal magnetic seat bracket (70) is magnetically attracted to the lifting seat (50), and the displacement measuring device (80) is installed on the universal magnetic seat bracket (70). The displacement measuring device (80) cooperates with the reference plate (62) to measure the displacement data of the precast engineering pile (40) during the test.

10. The precast engineering pile uplift test device according to claim 9, wherein: The displacement measuring device (80) includes a displacement sensor, or a laser distance measuring sensor, or a micrometer.

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