CN112211235A - Device and method for detecting static axial bearing capacity of steel pipe pile - Google Patents
Device and method for detecting static axial bearing capacity of steel pipe pile Download PDFInfo
- Publication number
- CN112211235A CN112211235A CN202011209492.7A CN202011209492A CN112211235A CN 112211235 A CN112211235 A CN 112211235A CN 202011209492 A CN202011209492 A CN 202011209492A CN 112211235 A CN112211235 A CN 112211235A
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- top plate
- bottom plate
- pipe pile
- bearing capacity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a device and a method for detecting the static axial bearing capacity of a steel pipe pile, wherein the device comprises an upper steel pipe joint, a lower steel pipe joint and a controllable deformation load box body, and the specifications of the upper steel pipe joint and the lower steel pipe joint are the same; the deformation load controllable box body comprises a top plate, a bottom plate and an outer protective cylinder, wherein the top plate and the bottom plate are of annular structures, the top plate is fixed in the upper steel pipe joint, the bottom plate is fixed in the outer protective cylinder, and the lower part of the outer wall of the outer protective cylinder is fixed in the lower steel pipe joint; the top plate is provided with a plurality of first threaded through holes, the bottom plate is provided with second threaded through holes corresponding to the plurality of first threaded through holes, and the first threaded through holes are connected with the corresponding second threaded through holes through locking screws; a plurality of jacks are arranged between the top plate and the bottom plate; the upper end of the locking screw rod is detachably connected with a displacement measuring rod. The invention can effectively resist the bending moment, the shearing force, the pressure and the pulling force of the pile body during pile sinking, the top plate and the bottom plate are firmly connected and are easy to separate, the displacement measuring rod can be recycled and reused, and the detection data is accurate and reliable.
Description
Technical Field
The invention belongs to the technical field of detection, and particularly relates to a device and a method for detecting static axial bearing capacity of a steel pipe pile.
Background
The traditional pile foundation load test method mostly adopts a pile loading method or an anchor pile method, but the required counter force is larger for a single-pile static load test pile with higher detection load, and the traditional pile test method has the defects of long construction time, large operation difficulty, high test cost, large safety risk and the like. Compared with the traditional pile testing method, the self-balancing testing method can be applied to the pile foundation with super-tonnage and the pile foundation bearing capacity test without pile loading and anchor pile conditions in special environment, is time-saving and economical, and is a pile foundation testing technology with a good development prospect. The self-balancing test method is that a specially-made loading device load box is placed at a designated position of a pile body, the load box is pressurized through a ground oil pump and a high-pressure oil pipe communicated with the oil pump and the load box, a top plate and a bottom plate of the load box are separated, namely, the upper pile section and the lower pile section of the load box are forced to generate corresponding displacement, and simultaneously, the load of the load box, the displacement of the top plate and the bottom plate, the displacement of a pile top, the stress of the pile body and the like are recorded to obtain a. At present, the self-balancing test method is mostly used for filling piles, the cases for precast piles such as steel pipe piles and PHC piles are relatively few, and the self-balancing test of the steel pipe piles can be divided into two types according to the installation method of a load box: the 1 st class steel pipe pile self-balancing test load box and the upper and lower sections of steel pipe piles are welded into a whole and then are driven into a soil layer; in the 2 nd class steel pipe pile self-balancing test, a special load box mounting joint is welded between the upper and lower steel pipe piles, after the steel pipe piles are driven into a soil layer, soil cores in the steel pipe piles are emptied to a certain depth below the mounting position of the load box, and then the load box is mounted.
During the 1 st type test method, the load box is embedded by dividing the pile body into an upper part and a lower part and then welding the load box, in order to ensure that the top plate and the bottom plate of the load box can be smoothly separated in the test process, the connection between the top plate and the bottom plate is weak in the piling process, which seriously affects the bending resistance, the shearing resistance and the tension and compression performance of the pile body, in the piling process, the high dynamic stress of the pile body can cause the dislocation, the fracture and the snapping of the steel pipe pile joints of the load box section, so that the load test can not be carried out, if the connection between the top plate and the bottom plate of the load box is enhanced, but the top plate and the bottom plate which are connected need to be pushed open by a large thrust to carry out the test in the self-balancing test, and the development of the test and the accuracy of test data can be adversely affected no matter whether the connection between the top plate and the. Meanwhile, after the test is finished, the displacement measuring rod embedded in the steel pipe pile is a disposable consumable product, and cannot be recycled, so that the detection cost is high.
Disclosure of Invention
The invention aims to provide a device and a method for detecting the static axial bearing capacity of a steel pipe pile, which can effectively resist the bending moment, the shearing force, the pressure and the pulling force of a pile body during pile sinking, can firmly connect and easily separate a top plate and a bottom plate, can recycle and repeatedly utilize a displacement measuring rod, and have accurate and reliable detection data.
The invention is realized by the following technical scheme:
a static axial bearing capacity detection device for a steel pipe pile comprises an upper steel pipe joint, a lower steel pipe joint and a deformation-controllable load box body, wherein the specifications of the upper steel pipe joint and the lower steel pipe joint are the same;
the deformation load controllable box body comprises a top plate, a bottom plate and an outer protecting cylinder, wherein the top plate and the bottom plate are of annular structures, the top plate is fixed in an upper steel pipe joint, the bottom plate is fixed in the outer protecting cylinder, and the lower part of the outer wall of the outer protecting cylinder is fixed in a lower steel pipe joint;
the top plate is provided with a plurality of first threaded through holes, the bottom plate is provided with second threaded through holes corresponding to the first threaded through holes, and the first threaded through holes and the corresponding second threaded through holes are connected through locking screws, so that the lower end of the upper steel pipe joint is abutted against the upper end of the lower steel pipe joint, and the upper end of the outer protective cylinder is abutted against the top plate;
a plurality of jacks are arranged between the top plate and the bottom plate, the jacks are arranged at equal intervals, the lower ends of the jacks are fixedly connected with the bottom plate, and the upper ends of the jacks are abutted to the top plate;
the upper end of the locking screw rod is detachably connected with a displacement measuring rod.
Furthermore, the controllable deformation load box body further comprises an inner protective cylinder, the inner diameters of the inner protective cylinder, the top plate and the bottom plate are the same, the inner protective cylinder is arranged between the top plate and the bottom plate, the lower end of the inner protective cylinder is fixed on the bottom plate, and the upper end of the inner protective cylinder is abutted to the top plate.
Furthermore, the outer diameter of the top plate is the same as the inner diameter of the upper steel pipe joint, the top surface of the top plate is provided with a plurality of upper supporting rib plates, and two edges of each upper supporting rib plate are respectively fixed on the upper steel pipe joint and the top plate; the outer diameter of the bottom plate is the same as the inner diameter of the outer protective cylinder, a plurality of lower supporting rib plates are arranged on the bottom surface of the bottom plate, and two edges of each lower supporting rib plate are respectively fixed on the outer protective cylinder and the bottom plate.
Furthermore, the number of the first threaded through holes is six, every two of the six first threaded through holes form a group, and the two first threaded through holes in the same group are symmetrically distributed on the top plate.
Furthermore, both ends of the locking screw rod can be detachably connected with the displacement measuring rod.
Furthermore, the locking screw rod is in threaded connection with the displacement measuring rod.
Furthermore, the displacement measuring rod comprises a plurality of sections of rod bodies which are sequentially in threaded connection.
Furthermore, the outside cover of displacement measuring staff is equipped with protective case.
Furthermore, the jack is an oil pressure jack, and an oil pipe through hole for an oil pipe of the jack to penetrate is formed in the top plate.
A detection method of the device for detecting the static axial bearing capacity of the steel pipe pile comprises the following steps:
mounting the assembled steel pipe pile static axial bearing capacity detection device on a steel pipe pile to be detected, and driving the steel pipe pile to be detected into a preset depth;
dividing the plurality of locking screws into three groups, namely a first group of locking screws, a second group of locking screws and a third group of locking screws, downwards rotating the first group of locking screws to be separated from the top plate and the bottom plate, lowering the first group of locking screws to the bottom of the steel pipe pile to be detected, upwards rotating the second group of locking screws to be separated from the bottom plate at the lower part of the second group of locking screws, and downwards rotating the third group of locking screws to be separated from the top plate at the upper part of the third group of locking screws;
after the steel pipe pile to be detected meets the rest time, carrying out bearing capacity detection on the steel pipe pile to be detected, and recording displacement data of each displacement measuring rod;
and analyzing the recorded displacement data of each displacement measuring rod to determine the bearing capacity of the steel pipe pile to be detected.
Compared with the prior art, the invention has the beneficial effects that: the top plate and the bottom plate of the controllable deformation load box body are respectively fixed in the upper steel pipe joint and the outer pile casing, and the lower part of the outer wall of the outer pile casing is fixed in the lower steel pipe joint to form a socket structure, so that the bending moment, the shearing force and the pressure of a pile body during pile sinking are effectively resisted, the pile body can be effectively prevented from being broken and dislocated in the pile driving process, and the controllable deformation load box body is protected; the top plate and the bottom plate of the controllable deformation load box body are connected and fixed through the plurality of locking screw rods, the tensile capacity can be designed according to the pile driving requirement, so that the top plate and the bottom plate are firmly connected, the pulling force of a pile body during pile sinking is effectively resisted, when the top plate and the bottom plate need to be separated, the corresponding locking screw rods only need to be rotated through the displacement measuring rods, so that the locking screw rods are separated from the top plate or the bottom plate, and the top plate and the bottom plate are convenient to separate; the displacement measuring rod is detachably connected with the locking screw rod, and after detection is finished, the displacement measuring rod can be recycled, so that the detection cost is reduced.
Drawings
FIG. 1 is a perspective view of a static axial bearing capacity detection device for a steel pipe pile according to the present invention;
FIG. 2 is a schematic view of the interior of a deformation load controllable box body in the static axial bearing capacity detection device for the steel pipe pile according to the present invention;
FIG. 3 is a top view of the static axial bearing capacity detection device of the steel pipe pile of the present invention;
fig. 4 is a bottom view of the static axial bearing capacity detection device for the steel pipe pile according to the present invention.
In the figure, 1-an upper steel pipe joint, 2-a lower steel pipe joint, 3-a controllable deformation load box body, 31-a top plate, 32-a bottom plate, 33-an outer protective cylinder, 34-a locking screw, 35-a jack, 36-a displacement measuring rod, 37-an inner protective cylinder, 38-an upper supporting rib plate and 39-a lower supporting rib plate.
Detailed Description
The invention is further illustrated by the following figures and examples.
Referring to fig. 1 to 4, fig. 1 is a perspective view of a structure of a steel pipe pile static axial bearing capacity detection device of the present invention, fig. 2 is a schematic view of an interior of a controllable deformation load box body in the steel pipe pile static axial bearing capacity detection device of the present invention, fig. 3 is a top view of the steel pipe pile static axial bearing capacity detection device of the present invention, and fig. 4 is a bottom view of the steel pipe pile static axial bearing capacity detection device of the present invention. A static axial bearing capacity detection device for a steel pipe pile comprises an upper steel pipe joint 1, a lower steel pipe joint 2 and a controllable deformation load box body 3, wherein the specifications of the upper steel pipe joint 1 and the lower steel pipe joint 2 are the same; the controllable deformation load box body 3 comprises a top plate 31, a bottom plate 32 and an outer protective cylinder 33, wherein the top plate 31 and the bottom plate 32 are both of annular structures, the top plate 31 is fixed in the upper steel pipe joint 1, the bottom plate 32 is fixed in the outer protective cylinder 33, and the lower part of the outer wall of the outer protective cylinder 33 is fixed in the lower steel pipe joint 2; a plurality of first threaded through holes are formed in the top plate 31, second threaded through holes corresponding to the plurality of first threaded through holes are formed in the bottom plate 32, and the first threaded through holes and the corresponding second threaded through holes are connected through locking screws 34, so that the lower end of the upper steel pipe joint 1 is abutted against the upper end of the lower steel pipe joint 2, and the upper end of the outer protective sleeve 33 is abutted against the top plate 31; a plurality of jacks 35 are arranged between the top plate 31 and the bottom plate 32, the jacks 35 are arranged at equal intervals, the lower ends of the jacks 35 are fixedly connected with the bottom plate 32, and the upper ends of the jacks 35 are abutted to the top plate 31; the upper end of the locking screw 34 is detachably connected with a displacement measuring rod 36.
The specifications of the upper steel pipe joint 1 and the lower steel pipe joint 2 are the same, namely the upper steel pipe joint 1 and the lower steel pipe joint 2 have the same inner diameter and outer diameter. The top plate 31 of the controllable deformation load box body 3 is fixed in the upper steel pipe joint 1, the bottom plate 32 is fixed on the lower steel pipe joint 2 through the outer protection cylinder 33, the bottom surface of the bottom plate 32 is flush with the upper end of the lower steel pipe joint 2, and the outer diameter of the outer protection cylinder 33 is the same as the inner diameter of the lower steel pipe joint 2. When the device for detecting the static axial bearing capacity of the steel pipe pile is used for detecting and testing, the upper steel pipe joint 1 and the lower steel pipe joint 2 are in butt joint with the pile body of the steel pipe pile to be detected and welded at the specified position of the pile body, and the specified position is calculated by a detector. This setting has increaseed the area of contact and the bonding strength of steerable deformation load box 3 with the pile body through last steel pipe festival 1 and lower steel pipe festival 2, and steerable deformation load box 3 has increaseed the area of contact and the bonding strength with lower steel pipe festival 2 through outer casing 33 simultaneously, and moment of flexure, shearing force and the pressure of pile body when resisting pile sinking effectively can effectively avoid pile in-process pile body rupture, dislocation, protects steerable deformation load box 3. And go up steel pipe section 1 and lower steel pipe section 2 lug weld on the pile body, it is simple convenient to install. In one embodiment, the outer diameter of the top plate 31 is the same as the inner diameter of the upper steel pipe joint 1, the top surface of the top plate is provided with a plurality of upper support rib plates 38, and two edges of the upper support rib plates 38 are respectively fixed on the upper steel pipe joint 1 and the top plate 31; the outer diameter of the bottom plate 32 is the same as the inner diameter of the outer casing 33, and the bottom surface of the bottom plate is provided with a plurality of lower support ribs 39, and two edges of the lower support ribs 39 are respectively fixed on the outer casing 33 and the bottom plate 32. A plurality of upper supporting rib plates 38 are arranged between the top plate 31 and the upper steel pipe joint 1, a plurality of lower supporting rib plates 39 are arranged between the bottom plate 32 and the outer protective sleeve 33, the bonding strength between the top plate 31 and the upper steel pipe joint 1 is further increased, the bonding strength between the bottom plate 32 and the outer protective sleeve 33 is increased, and therefore the bonding strength between the controllable deformation load box body 3 and the pile body is further increased. Preferably, a plurality of upper support ribs 38 are provided at equal intervals on the top surface of the top plate 31, and a plurality of lower support ribs 39 are provided at equal intervals on the bottom surface of the bottom plate 32. In one embodiment, the upper support rib 38 comprises a first rectangular section and a first right-angle trapezoidal section, the lower end of the first rectangular section is fixed on the top surface of the top plate 31, the upper end of the first rectangular section is connected with the lower bottom of the first right-angle trapezoidal section, and the right-angle waist of the first right-angle trapezoidal section is welded with the upper steel pipe joint 1. The lower support rib plate 39 includes a second rectangular section and a second right-angled trapezoidal section, the upper end of the second rectangular section is fixed on the bottom surface of the bottom plate 32, the lower end thereof is connected with the lower bottom of the second right-angled trapezoidal section, and the right-angled waist of the second right-angled trapezoidal section is welded with the outer casing 33.
The quantity of locking screw 34 is the same and the one-to-one with the quantity of first screw thread through-hole, second screw thread through-hole is the same and the one-to-one with the quantity of first screw thread through-hole, when roof 31 and bottom plate 32 are connected to needs, place roof 31 on outer casing 33, and make first screw thread through-hole be located the second screw thread through-hole that corresponds directly over, the lower extreme of going up steel pipe festival 1 is placed in the upper end of steel pipe festival 2 down, screw in corresponding first screw thread through-hole and corresponding second screw thread through-hole in proper order through locking screw 34, make roof 31 and bottom plate 32 firmly connected together, the lower extreme of going up steel pipe festival 1 this moment and the upper end butt of steel pipe festival 2 down, the upper end and the roof 31 butt of outer casing 33. The top plate 31 and the bottom plate 32 are connected through the plurality of locking screw rods 34, so that the tensile capacity can be designed according to the pile driving requirement, the tensile force of the pile body during pile sinking can be effectively resisted, and the controllable deformation load box body 3 is prevented from being damaged due to the fact that the tensile stress of the pile body is large in the pile driving process. When the top plate 31 and the bottom plate 32 need to be separated for a self-balancing test, the locking screws 34 only need to be screwed out of the top plate 31 or the bottom plate 32, and the top plate 31 and the bottom plate 32 can be separated conveniently and quickly. In one embodiment, the controlled deformation load box 3 further comprises an inner casing 37, the inner diameters of the inner casing 37, the top plate 31 and the bottom plate 32 are the same, the inner casing 37 is disposed between the top plate 31 and the bottom plate 32, the lower end of the inner casing is fixed on the bottom plate 32, and the upper end of the inner casing is abutted to the top plate 31. The inner diameter edge of the inner casing 37 is flush with the inner diameter edge of the top plate 31 and the inner diameter edge of the bottom plate 32 so as to form a through hole in the middle of the controllable phenotype load box body, and a containing cavity is formed among the top plate 31, the bottom plate 32, the outer casing 33 and the inner casing 37, and a plurality of jacks 35 are arranged in the containing cavity. The influence of soil on the jack 35 in the piling process is avoided, so that the jack 35 is damaged and the self-balancing test cannot be carried out. In an embodiment, the jack 35 is an oil jack 35, and the top plate 31 is provided with an oil pipe through hole for an oil pipe of the jack 35 to pass through. The oil pipe of the jack 35 is connected with the high-pressure oil pump after passing through the oil pipe through hole.
The upper end of the locking screw 34 is detachably connected with a displacement measuring rod 36, and a tester can rotate the displacement measuring rod 36 to drive the locking screw 34 to rotate through the displacement measuring rod 36 connected with the locking screw 34. In one embodiment, both ends of the locking screw 34 are removably connected to the displacement rod 36. Preferably, the locking screw 34 is threadedly connected to the displacement rod 36. For example, an internal thread is arranged at one end of the displacement measuring rod 36 connected with the locking screw 34, an external thread is arranged at one end of the locking screw 34 connected with the displacement measuring rod 36, and the locking screw 34 is sleeved on the displacement measuring rod 36 in a threaded manner; of course, an external thread may be provided at one end of the displacement measuring rod 36, an internal thread may be provided at one end of the locking screw 34, and the displacement measuring rod 36 is threadedly sleeved on the locking screw 34. In this way, the locking screw 34 and the displacement measuring rod 36 are sufficiently fastened, so that the worker rotates the locking screw 34 by rotating the displacement measuring rod 36, thereby screwing the locking screw 34 out of the top plate 31 or the bottom plate 32, or screwing the locking screw 34 out of the top plate 31 and the bottom plate 32. And the threads with different trends are arranged according to different rotating directions. In one embodiment, the end of the displacement measuring rod 36 connected to the locking screw 34 is provided with an external thread, the upper end and the lower end of the locking screw 34 are provided with an internal thread which is in threaded fit with the external thread of the displacement measuring rod 36, and the internal thread at the upper end of the locking screw 34 has the same direction as the internal thread at the lower end thereof. If the internal thread at the upper end of the locking screw 34 and the internal thread at the lower end of the locking screw are both left-handed threads, or the internal thread at the upper end of the locking screw 34 and the internal thread at the lower end of the locking screw are both right-handed threads, different end parts are selected to be in threaded connection with the displacement measuring rod 36 according to different rotation directions of the locking screw 34. Therefore, the locking screws 34 have the same structure, and can be produced uniformly, and the cost is reduced.
The plurality of displacement measuring rods 36 detachably connected with the plurality of locking screws 34 are used for measuring pile end displacement of the steel pipe pile to be detected, and top plate 31 displacement and bottom plate 32 displacement of the controllable deformation box body, namely, the plurality of locking screws 34 and the plurality of displacement measuring rods 36 are divided into three parts. In an embodiment, the number of the first threaded through holes is six, two of the six first threaded through holes are in a group, and two first threaded through holes in the same group are symmetrically arranged on the top plate 31. The number of the first threaded through holes is six, then the number of the locking screws 34 and the number of the second threaded through holes are also six, the six locking screws 34 and the second threaded through holes are also grouped into a group two by two according to the grouping mode of the six first threaded through holes, the two locking screws 34 in the same group are symmetrically arranged on the top plate 31 and the bottom plate 32, and the two second threaded through holes in the same group are symmetrically arranged on the bottom plate 32. The six locking screws 34 are divided into three groups, namely a first group of locking screws 34, a second group of locking screws 34 and a third group of locking screws 34, displacement measuring rods 36 respectively connected with the two locking screws 34 of the first group of locking screws 34 are used for measuring the displacement of the pile end, displacement measuring rods 36 respectively connected with the two locking screws 34 of the second group of locking screws 34 are used for measuring the displacement of the top plate 31, displacement measuring rods 36 respectively connected with the two locking screws 34 of the third group of locking screws 34 are used for measuring the displacement of the bottom plate 32, when a self-balancing test is carried out, the two locking screws 34 of the first group of locking screws 34 are required to be sequentially screwed out of the top plate 31 and the bottom plate 32, and the two locking screws 34 of the first group of locking screws 34 are required to be lowered to the bottom of the steel pipe pile to; two locking screws 34 of the second set of locking screws 34 are screwed out of the bottom plate 32 while still being connected to the top plate 31 by threads; two locking screws 34 of the third set of locking screws 34 are screwed out of the top plate 31 while still being connected to the bottom plate 32 by threads. After the six locking screws 34 are operated in the above manner, the top plate 31 and the bottom plate 32 are separated, and a self-balancing test can be performed.
In one embodiment, the displacement measuring rod 36 comprises a multi-section rod body, which is in turn threaded. One end of each rod body is provided with an internal thread, the other end of each rod body is provided with an external thread, and the radius of the rod body with one end of the external thread is smaller than that of the rod body with one end of the internal thread. When in connection, one end of one rod body provided with the internal thread is sleeved at one end of the other rod body provided with the external thread in a threaded manner. Through the scheme, multiple sections of the rod bodies in the displacement measuring rod 36 can be in the same style, the difficulty of the manufacturing process is reduced, any rod body can be sleeved on another rod body different from the displacement measuring rod in a screwed connection mode, and meanwhile the length of the displacement measuring rod 36 can be automatically set according to the length requirement of the displacement measuring rod 36 when a user carries out a detection test. In one embodiment, the displacement rod 36 is sleeved with a protective sleeve. The protective sleeve is used to protect the displacement measuring rod 36.
A detection method of the device for detecting the static axial bearing capacity of the steel pipe pile comprises the following steps:
s1, mounting the assembled steel pipe pile static axial bearing capacity detection device on the steel pipe pile to be detected, and driving the steel pipe pile to be detected into a preset depth;
s2, dividing the plurality of locking screws 34 into three groups, namely a first group of locking screws 34, a second group of locking screws 34 and a third group of locking screws 34, rotating the first group of locking screws 34 to be separated from the top plate 31 and the bottom plate 32, lowering the first group of locking screws to the bottom of the steel pipe pile to be detected, rotating the second group of locking screws 34 to be separated from the bottom plate 32, and rotating the third group of locking screws 34 to be separated from the top plate 31;
s3, after the steel pipe pile to be detected meets the rest time, carrying out bearing capacity detection on the steel pipe pile to be detected, and recording displacement data of each displacement measuring rod 36;
and S4, analyzing the recorded displacement data of each displacement measuring rod 36, and determining the bearing capacity of the steel pipe pile to be detected.
In the step S1, the static axial bearing capacity detection device of the steel pipe pile is assembled, the specified installation position of the static axial bearing capacity detection device of the steel pipe pile is calculated according to the characteristics of the steel pipe pile to be detected, the upper steel pipe joint 1 and the lower steel pipe joint 2 are butt-welded to the specified installation position, and then all the displacement measuring rods 36 are lengthened to the position close to the top of the steel pipe pile to be detected. And (3) driving the steel pipe pile to be detected to a preset depth by adopting an integral hoisting and opening-closing pile driving hammer, lengthening all the displacement measuring rods 36 to be about 1 meter higher than the top of the steel pipe pile to be detected, and simultaneously connecting the oil pipe of the jack 35 with a high-pressure oil pump.
In the step S2, the displacement measuring rods 36 connected to the first set of locking screws 34 are the first set of displacement measuring rods 36, the displacement measuring rods 36 connected to the second set of locking screws 34 are the second set of displacement measuring rods 36, the displacement measuring rods 36 connected to the third set of locking screws 34 are the third set of displacement measuring rods 36, the first set of displacement measuring rods 36 are respectively rotated by a tool to drive the first set of locking screws 34 to rotate, the first set of locking screws 34 are rotated to be separated from the top plate 31 and the bottom plate 32 and are lowered to the bottom of the steel pipe pile to be detected, that is, the lowering distance is greater than a preset first distance, the first set of displacement measuring rods 36 are synchronously lengthened in the lowering process to ensure that the first set of displacement measuring rods 36 are still higher than the top of the steel pipe pile to be detected by about 1 meter, and the first set of displacement measuring rods 36 are used for measuring the displacement of the pile end of the steel pipe pile; similarly, the second group of displacement measuring rods 36 are respectively rotated by using a tool to drive the second group of locking screws 34 to rotate, and the second group of locking screws 34 are rotated to be separated from the bottom plate 32, namely the ascending distance of the second group of displacement measuring rods 36 is greater than the preset second distance, and the second group of displacement measuring rods 36 are used for measuring the displacement of the top plate 31 of the controllable deformation load box body 3; utilize the instrument to rotate respectively with third group displacement measuring rod 36, drive third group locking screw 34 rotatory, rotatory third group locking screw 34 to break away from with roof 31, promptly third group displacement measuring rod 36's descending distance be greater than predetermined third distance can, third group displacement measuring rod 36 is used for measuring the displacement of steerable load box 3's bottom plate 32.
In step S3, after the steel pipe pile to be detected meets the rest time, the steel pipe pile to be detected is subjected to bearing capacity detection, the jack 35 applies a load to the top plate 31 and the bottom plate 32, and displacement data of each displacement rod 36 is measured and recorded. The displacement of the pile end of the steel pipe pile to be detected, the displacement of the top plate 31 of the controllable deformation load box body 3 and the displacement of the bottom plate 32 of the controllable deformation load box body 3 are measured by two displacement measuring rods 36, test data are accurate and reliable, and the test is simple, convenient, safe and economical.
In the step S4, a load-displacement Q-S curve, a displacement-time logarithm S-lgt curve, and other curves requiring auxiliary analysis are drawn, so that the bearing capacity of the steel pipe pile to be detected is determined by calculation, and the method for calculating the bearing capacity of the steel pipe to be detected according to the displacement data is an existing calculation method, and is not described herein again. After the test is finished, the displacement measuring rod 36 is rotated by a tool and is recovered, so that the detection cost can be reduced.
Compared with the prior art, the invention has the beneficial effects that: the top plate 31 and the bottom plate 32 of the controllable deformation load box body 3 are respectively fixed in the upper steel pipe joint 1 and the outer protecting cylinder 33, and the lower part of the outer wall of the outer protecting cylinder 33 is fixed in the lower steel pipe joint 2 to form a socket structure, so that the bending moment, the shearing force and the pressure of a pile body during pile sinking are effectively resisted, the pile body can be effectively prevented from being broken and dislocated in the pile driving process, and the controllable deformation load box body 3 is protected; the top plate 31 and the bottom plate 32 of the controllable deformation load box body 3 are fixedly connected through a plurality of locking screw rods 34, the tensile capacity can be designed according to the piling requirement, so that the top plate 31 and the bottom plate 32 are firmly connected, the pulling force of a pile body during pile sinking is effectively resisted, when the top plate 31 and the bottom plate 32 need to be separated, the corresponding locking screw rods 34 only need to be rotated through the displacement measuring rods 36, the locking screw rods 34 are separated from the top plate 31 or the bottom plate 32, and the top plate 31 and the bottom plate 32 are conveniently separated; the displacement measuring rod 36 is detachably connected with the locking screw 34, and after detection is finished, the displacement measuring rod 36 can be recycled, so that the detection cost is reduced.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (10)
1. The device for detecting the static axial bearing capacity of the steel pipe pile is characterized by comprising an upper steel pipe joint, a lower steel pipe joint and a controllable deformation load box body, wherein the specifications of the upper steel pipe joint and the lower steel pipe joint are the same;
the controllable deformation load box body comprises a top plate, a bottom plate and an outer protective cylinder, wherein the top plate and the bottom plate are of annular structures, the top plate is fixed in an upper steel pipe joint, the bottom plate is fixed in the outer protective cylinder, and the lower part of the outer wall of the outer protective cylinder is fixed in a lower steel pipe joint;
the top plate is provided with a plurality of first threaded through holes, the bottom plate is provided with second threaded through holes corresponding to the first threaded through holes, and the first threaded through holes are connected with the corresponding second threaded through holes through locking screws, so that the lower end of the upper steel pipe joint is abutted against the upper end of the lower steel pipe joint, and the upper end of the outer protective cylinder is abutted against the top plate;
a plurality of jacks are arranged between the top plate and the bottom plate, the jacks are arranged at equal intervals, the lower ends of the jacks are fixedly connected with the bottom plate, and the upper ends of the jacks are abutted to the top plate;
the upper end of the locking screw rod is detachably connected with a displacement measuring rod.
2. The steel pipe pile static axial bearing capacity detection device as claimed in claim 1, wherein the controllable deformation load box body further comprises an inner casing, the inner diameters of the inner casing, the top plate and the bottom plate are the same, the inner casing is arranged between the top plate and the bottom plate, the lower end of the inner casing is fixed on the bottom plate, and the upper end of the inner casing is abutted against the top plate.
3. The device for detecting the static axial bearing capacity of the steel pipe pile according to claim 1, wherein the outer diameter of the top plate is the same as the inner diameter of the upper steel pipe joint, a plurality of upper support rib plates are arranged on the top surface of the top plate, and two edges of the upper support rib plates are respectively fixed on the upper steel pipe joint and the top plate; the outer diameter of the bottom plate is the same as the inner diameter of the outer protective cylinder, a plurality of lower supporting rib plates are arranged on the bottom surface of the bottom plate, and two edges of each lower supporting rib plate are fixed on the outer protective cylinder and the bottom plate respectively.
4. The device for detecting the static axial bearing capacity of the steel pipe pile according to claim 1, wherein the number of the first threaded through holes is six, every two of the six first threaded through holes form a group, and the two first threaded through holes in the same group are symmetrically arranged on the top plate.
5. The device for detecting the static axial bearing capacity of the steel pipe pile according to claim 1, wherein both ends of the locking screw rod can be detachably connected with the displacement measuring rod.
6. The device for detecting the static axial bearing capacity of the steel pipe pile according to claim 1, wherein the locking screw is in threaded connection with the displacement measuring rod.
7. The device for detecting the static axial bearing capacity of the steel pipe pile according to claim 1, wherein the displacement measuring rod comprises a plurality of sections of rod bodies, and the plurality of sections of rod bodies are sequentially in threaded connection.
8. The device for detecting the static axial bearing capacity of the steel pipe pile according to claim 1, wherein a protective sleeve is sleeved outside the displacement measuring rod.
9. The steel-pipe pile static axial bearing capacity detection device according to claim 1, wherein the jack is an oil pressure jack, and an oil pipe through hole for an oil pipe of the jack to pass through is formed in the top plate.
10. A method for detecting a static axial bearing capacity detection device of a steel pipe pile according to any one of claims 1 to 9, wherein the method comprises the following steps:
mounting the assembled steel pipe pile static axial bearing capacity detection device on a steel pipe pile to be detected, and driving the steel pipe pile to be detected into a preset depth;
dividing the plurality of locking screws into three groups, namely a first group of locking screws, a second group of locking screws and a third group of locking screws, rotating the first group of locking screws downwards to be separated from the top plate and the bottom plate, lowering the first group of locking screws to the bottom of the steel pipe pile to be detected, rotating the second group of locking screws upwards to separate the lower parts of the second group of locking screws from the bottom plate, and rotating the third group of locking screws downwards to separate the upper parts of the third group of locking screws from the top plate;
after the steel pipe pile to be detected meets the rest time, carrying out bearing capacity detection on the steel pipe pile to be detected, and recording displacement data of each displacement measuring rod;
and analyzing the recorded displacement data of each displacement measuring rod to determine the bearing capacity of the steel pipe pile to be detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011209492.7A CN112211235A (en) | 2020-11-03 | 2020-11-03 | Device and method for detecting static axial bearing capacity of steel pipe pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011209492.7A CN112211235A (en) | 2020-11-03 | 2020-11-03 | Device and method for detecting static axial bearing capacity of steel pipe pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112211235A true CN112211235A (en) | 2021-01-12 |
Family
ID=74058031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011209492.7A Pending CN112211235A (en) | 2020-11-03 | 2020-11-03 | Device and method for detecting static axial bearing capacity of steel pipe pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112211235A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113006164A (en) * | 2021-03-05 | 2021-06-22 | 广东安邦项目管理有限公司 | Device and method for detecting static axial bearing capacity of steel pipe pile |
-
2020
- 2020-11-03 CN CN202011209492.7A patent/CN112211235A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113006164A (en) * | 2021-03-05 | 2021-06-22 | 广东安邦项目管理有限公司 | Device and method for detecting static axial bearing capacity of steel pipe pile |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9605404B2 (en) | High strain dynamic load testing procedure | |
| US9458593B2 (en) | Deep pile foundation construction methodology for existing and new buildings | |
| CN211230435U (en) | Fixing device of inclinometer | |
| US20150233230A1 (en) | Borehole inspecting and testing device and method of using the same | |
| CN104328810B (en) | Prefabricated tubular pile single pile foundation bearing capacity detection improvement method | |
| CN110924389B (en) | Anchor rod capable of controlling multistage stress and displacement in extension and monitoring acoustic emission | |
| CN105588802A (en) | Three-dimensional experimental system and experimental method for simulating plastic zone of surrounding rock of roadway | |
| WO2016178684A1 (en) | Borehole inspecting and testing device and method of using the same | |
| CN112211235A (en) | Device and method for detecting static axial bearing capacity of steel pipe pile | |
| CN216787247U (en) | Force measurement display device of ground anchor pile | |
| CN214090019U (en) | Steel-pipe pile static axial bearing capacity detection device | |
| CN113482068A (en) | Foundation pit support automatic monitoring system | |
| CA3150000C (en) | Top loaded bidirectional testing system and method of using the same | |
| CN111535375A (en) | Pile foundation horizontal bearing capacity detection system and method | |
| JP3893601B1 (en) | Anchor maintenance jack and method for jacking up existing ground anchor | |
| US10167608B1 (en) | Apparatus for bi-directional load testing of driven piles and injection piles, and method thereof | |
| CN113026830A (en) | Reusable deep load test equipment for open caisson construction period | |
| CN111827375A (en) | Construction method for detecting foundation pile load based on self-balancing static load | |
| CN214423428U (en) | Device for detecting side frictional resistance of steel pipe pile | |
| CN110512664B (en) | Hinge type anchor rope frame beam soil slope reinforcement power model device and test method | |
| CN216892552U (en) | Building engineering foundation pile detection device | |
| CN217231983U (en) | Self-balancing test device | |
| CN114562655B (en) | Building site centering frame props | |
| CN220450926U (en) | Underwater barrel-shaped foundation ultimate bearing capacity detection device | |
| CN215165424U (en) | Loading device for deep layer load test in open caisson construction period |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |