CN221218923U - Horizontal static load test device for single pile of offshore pile foundation - Google Patents
Horizontal static load test device for single pile of offshore pile foundation Download PDFInfo
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- CN221218923U CN221218923U CN202323169045.5U CN202323169045U CN221218923U CN 221218923 U CN221218923 U CN 221218923U CN 202323169045 U CN202323169045 U CN 202323169045U CN 221218923 U CN221218923 U CN 221218923U
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Abstract
The utility model discloses a horizontal static load test device for a single pile of an offshore pile foundation, which comprises a first horizontal tension loading device, a horizontal tension measuring device, a second horizontal tension loading device and a pile body horizontal displacement measuring device which are connected in sequence; the first horizontal tension loading device comprises a first steel wire rope and a chain block; the two ends of the first steel wire rope are connected through the first steel wire rope buckle to form an annular rope body; the movable lifting hook of the chain block is connected to the first steel wire rope clip; the second horizontal tension loading device comprises a second steel wire rope, and two ends of the second horizontal tension loading device are connected through a second steel wire rope buckle to form an annular rope body; the horizontal tension measuring device comprises a dynamometer, and two ends of the dynamometer are respectively connected with a fixed lifting hook of the chain block and a second steel wire rope clip; the pile body horizontal displacement measuring device comprises an inclinometer, a protective tube group and an inclinometer tube group; the device is flexible and portable to install and detach, convenient to transport and store, stable in test process, high in efficiency and low in cost.
Description
Technical Field
The utility model relates to the technical field of single pile horizontal static load tests, in particular to a single pile horizontal static load test device for an offshore pile foundation.
Background
At present, the horizontal bearing capacity of the pile foundation can be obtained through two modes of empirical formula estimation and horizontal static load test; among these, horizontal static load tests are the most reliable way to determine the horizontal bearing capacity of pile foundations. In the structural design of the offshore pile foundation, the load needs to consider not only permanent load but also dynamic loads such as wind load, snow load and the like. In the load direction, the impact of horizontal loads on pile foundation design is relatively large compared to vertical loads. Thus, the horizontal load bearing capacity of pile foundations is a major controlling factor in pile foundation design, especially for large-pitch pile foundations.
The existing offshore pile foundation single pile horizontal static load test device has some defects and shortcomings, including: 1) For a large-spacing pile foundation with the center distance of foundation piles being larger than 10 times of pile diameter, the problems of poor stability of a test system, great increase of test cost and the like can occur in pressure loading; 2) The traditional counterforce pile method only has the cost of piling materials of millions of yuan, and the cost of a ship machine and the like is not considered temporarily, so that the construction cost is high; 3) When the traditional anchor pile method is used for carrying out a horizontal static load test, at least four anchor piles are required to be driven on the sea, and the construction is time-consuming and high in cost; 4) The traditional horizontal displacement measurement method is to put the reference beam on the reference piles and then to perform displacement measurement, so that two reference piles are required to be driven on the sea, and the construction is time-consuming and high in cost.
Disclosure of utility model
The utility model aims to provide a horizontal static load test device for the single pile of the offshore pile foundation, which solves the problem of the detection of the horizontal static load test of the single pile of the existing offshore pile foundation.
For this purpose, the technical scheme of the utility model is as follows:
The horizontal static load test device for the single pile of the offshore pile foundation comprises a first horizontal tension loading device, a horizontal tension measuring device, a second horizontal tension loading device and a pile body horizontal displacement measuring device which are connected in sequence;
the first horizontal tension loading device comprises a first steel wire rope and a chain block; the two ends of the first steel wire rope are connected through a first steel wire rope clip, so that the first steel wire rope forms an annular rope body with an adjustable diameter; the movable lifting hook of the chain block is connected to the first steel wire rope clip;
The second horizontal tension loading device comprises a second steel wire rope, and two ends of the second steel wire rope are connected through a second steel wire rope clip, so that the second steel wire rope forms an annular rope body with an adjustable diameter;
The horizontal tension measuring device comprises a dynamometer, one end of the dynamometer is connected with a fixed lifting hook of the chain block, and the other end of the dynamometer is connected with a second steel wire rope clip;
The pile body horizontal displacement measuring device comprises an inclinometer, a protective tube group and an inclinometer tube group; the protection tube group consists of two protection tubes which are symmetrically fixed on the side wall of the pile body in a mode that the axial direction of the protection tube group is parallel to the axial direction of the pile body; the inclinometer tube group consists of two inclinometer tubes which are inserted into the two protection tubes in a way of being coaxially arranged with the protection tubes; at least two axial grooves are uniformly distributed on the inner wall of the inclinometer along the circumferential direction, and the groove depth of the axial grooves is adapted to the diameter of the roller wheels on the inclinometer probe, so that the rollers on two sides of the inclinometer probe are respectively embedded in the two axial grooves on the inner wall of the inclinometer.
Further, the first horizontal tension loading device further comprises a first shackle and a first connecting wire rope; the first shackle is connected to the movable lifting hook of the chain block, so that the movable lifting hook of the chain block is detachably connected to the first steel wire rope buckle through the first shackle; one end of the first connecting steel wire rope is fixed on a fixed lifting hook of the chain block, and the other end of the first connecting steel wire rope is provided with a lifting ring.
Further, the second horizontal tension loading device further comprises a fourth shackle and a second connecting steel wire rope; the fourth shackle is detachably connected to the second steel wire rope buckle; one end of the second connecting steel wire rope is fixed on the fourth unloading buckle, and the other end of the second connecting steel wire rope is provided with a hanging ring.
Further, the hanging rings at two ends of the dynamometer are respectively connected with a second shackle and a third shackle, so that one end of the dynamometer is detachably connected to the hanging ring at the other end of the first connecting steel wire rope through the second shackle, and the other end of the dynamometer is detachably connected to the hanging ring at the other end of the second connecting steel wire rope through the third shackle.
Further, the protection tube is a steel tube with an opening at the top and a closed bottom; the inclinometer is a PVC pipe with an opening at the top and a closed bottom.
Further, the first steel wire rope, the second steel wire rope, the first connecting steel wire rope and the second connecting steel wire rope adopt steel wire ropes with the same specification.
Compared with the traditional single pile horizontal static load test equipment, the offshore pile foundation single pile horizontal static load test device has the advantages of simple structure, flexible and portable assembly and disassembly, and simple transportation and storage in a non-use state; on structural design, the device includes first horizontal tension loading device, horizontal tension measuring device and second horizontal tension loading device, through carrying out the mode of carrying out to the pulling to two pile bodies that await measuring and realizing loading appointed static load, and then utilize pile body horizontal displacement measuring device to measure the straightness change of perpendicularity of pile bodies around the loading static load, can obtain single pile horizontal bearing capacity fast, not only effectively reduce the requirement and the cost of traditional marine horizontal static load test, and test process stability and efficient, verify whether the horizontal bearing capacity of tubular pile satisfies the accurate structure of construction requirement, so that the horizontal displacement of two pile bodies changes of more accurate judgement, synthesize the relation of the horizontal force that marine pile foundation receives and displacement, can more audio-visual observation foundation pile horizontal bearing capacity's degree of variation.
Drawings
FIG. 1 is a top view of the horizontal static load test device for a single pile of an offshore pile foundation of the utility model;
FIG. 2 is a side view of the horizontal static load test device for the single pile of the offshore pile foundation of the utility model;
FIG. 3 is a cross-sectional view of an inclinometer pipe of the offshore pile foundation mono-pile horizontal static load test device of the present utility model.
Detailed Description
The utility model will now be further described with reference to the accompanying drawings and specific examples, which are in no way limiting.
Referring to fig. 1 and 2, the horizontal static load test device for the offshore pile foundation single pile comprises a first horizontal tension loading device, a horizontal tension measuring device, a second horizontal tension loading device and a pile body horizontal displacement measuring device which are sequentially connected.
The first horizontal tension loading device comprises a first steel wire rope 11, a first shackle 2, a chain block 3 and a first connecting steel wire rope 14; the two ends of the first steel wire rope 11 are connected through a first steel wire rope clip, so that the first steel wire rope 11 forms an annular rope body with an adjustable diameter; the first shackle 2 is detachably connected to the first steel wire rope buckle; the chain block 3 adopts a commercial product, and the specific selection of the chain block meets the level bearing capacity to be tested; the movable lifting hook of the chain block 3 is connected with the first connecting steel wire rope 14 by hanging the first shackle 2 on the first steel wire rope buckle; one end of the first connecting steel wire rope 14 is fixedly connected to the fixed lifting hook of the chain block 3, and the other end of the first connecting steel wire rope is fixedly provided with a lifting ring.
The first horizontal tension loading device and the second horizontal tension loading device are respectively sleeved on the two pile bodies to be tested so as to load horizontal tension to the pile bodies to be tested.
The second horizontal tension loading device comprises a second steel wire rope 12, a fourth shackle 7 and a second connecting steel wire rope 15; wherein, the two ends of the second steel wire rope 12 are connected through the second steel wire rope fastener, so that the second steel wire rope 12 forms an annular rope body with adjustable diameter; the fourth shackle 7 is detachably connected to the second steel wire rope buckle; one end of the second connecting steel wire rope 15 is fixedly connected to the fourth shackle 7, and the other end of the second connecting steel wire rope is fixedly provided with a hanging ring.
The horizontal tension measuring device is used for measuring and controlling the horizontal load and comprises a second shackle 4, a dynamometer 5 and a third shackle 6; wherein, the dynamometer 5 adopts a commercial dynamometer with the measuring range meeting the level bearing capacity to be loaded; the second shackle 4 and the third shackle 6 are respectively fixed on the hanging rings at two ends of the dynamometer 5, and when the dynamometer is used, one end of the dynamometer 5 is detachably fixed at the hanging ring end of the first connecting steel wire rope 14 through the second shackle 4, and the other end of the dynamometer 5 is detachably fixed at the hanging ring end of the second connecting steel wire rope 15 through the third shackle 6.
The pile body horizontal displacement measuring device is used for measuring pile body displacement and comprises an inclinometer, a protective tube group and an inclinometer tube group; the protection pipe group consists of two protection pipes 1 which are symmetrically fixed on the side wall of the pile body in a mode that the axial direction of the protection pipe group is parallel to the axial direction of the pile body; the protection pipe 1 is a steel pipe with an opening at the top and a closed bottom, so as to be convenient to be welded and fixed on the pile body; the inclinometer tube group consists of two inclinometer tubes which are inserted into the two protection tubes 1 in a way of being coaxially arranged with the protection tubes 1; the inclinometer is a PVC pipe with an opening at the top and a closed bottom; in the actual use process, after the pile body welded with the protection pipe 1 is completely driven, the inclinometer pipe is inserted into the protection pipe 1 in a coaxial arrangement mode with the protection pipe 1, and sand is filled in an annular gap between the inclinometer pipe and the protection pipe 1, so that the inclinometer pipe is fixed in the protection pipe 1;
Referring to fig. 3, the inclinometer is a commercial product and comprises a probe, and rollers are arranged on two sides of the probe; correspondingly, the inner diameter of the inclinometer pipe is matched with the outer diameter of the probe of the inclinometer, four axial grooves are uniformly distributed on the inner wall of the pipe body along the circumferential direction, the groove depth of each axial groove is matched with the diameter of a roller wheel on the probe of the inclinometer, so that the rollers on two sides of the probe of the inclinometer pipe are respectively embedded in any group of axial grooves on the opposite sides of the inner wall of the inclinometer pipe, and the inclinometer pipe extends into and extends out of the inclinometer pipe in a way of always keeping coaxial arrangement with the inclinometer pipe; in the actual use process, the inclinometer respectively measures the pile body to be measured after loading horizontal tensile force, each measurement comprises the steps of extending a probe of the inclinometer into and out of an inclinometer pipe positioned on one side of the pile body, then extending the probe of the inclinometer into and out of the inclinometer pipe positioned on the other side of the pile body, testing four times in total, averaging four test results and taking the four test results as a perpendicularity result of the pile body, and obtaining displacement change of the pile body according to perpendicularity change of the pile body after horizontal force loading.
Referring to fig. 1 and 2, the specific implementation steps for detecting the horizontal bearing capacity of two adjacent pile bodies to be detected by adopting the offshore pile foundation single pile horizontal static load test device are as follows:
s1, respectively naming two opposite-pulling pile bodies for testing as a first pile body 9 and a second pile body 10; before piling, two protection pipes 1 are welded and fixed on opposite side walls of the first pile body 9 and the second pile body 10;
S2, performing driving on the first pile body 9 and the second pile body 10; after the pile is put in place, a constructor builds a test bearing platform 13 between the first pile body 9 and the second pile body 10 so as to facilitate walking and placing test facilities;
S3, inserting the inclinometer pipes into the protection pipes 1 on two sides of the first pile body 9, and filling sand into the annular gaps between the inclinometer pipes and the protection pipes 1 to fix the inclinometer pipes in the protection pipes 1;
S4, extending a probe of the inclinometer into and out of the inclinometer pipe at one side of the first pile body 9 to obtain two groups of test data, and extending the probe of the inclinometer into and out of the inclinometer pipe at the other side of the first pile body 9 to obtain two groups of test data; averaging four groups of test data of the two tests to obtain verticality of the first pile body 9 before horizontal static load test; similarly, the same test is carried out on the second pile body 10, and the obtained result is used as a test result of the second pile body; in the testing process, lifting the probes of the inclinometer sequentially at intervals of 0.5m and recording data until the probes pass through the whole pipeline of the inclinometer;
s5, sleeving a first steel wire rope 11 and a second steel wire rope 12 in the first pile body 9 and the second pile body 10 respectively, and adjusting the inner diameters through steel wire rope buckles on the first steel wire rope 11 and the second steel wire rope 12 so as to ensure that the first steel wire rope 11 and the second steel wire rope 12 are fixed on the two pile bodies; then, the first horizontal tension loading device, the horizontal tension measuring device and the second horizontal tension loading device are connected in sequence and are horizontally arranged; wherein the lengths of the first connecting steel wire rope 14 and the second connecting steel wire rope 15 are matched with the interval between the first pile body 9 and the second pile body 10;
s6, starting the chain block 3, loading horizontal tension to the pile body to be tested by withdrawing the chain of the chain block 3, and determining whether the horizontal tension loaded by the chain block 3 accords with test setting according to the reading displayed by the dynamometer 5; specifically, the horizontal pulling force is loaded by the chain block 3 from 0N, and the loading mode is adopted to gradually increase the load capacity to the estimated ultimate bearing capacity in 1/10 of the estimated ultimate bearing capacity as an increment; the duration time of loading the horizontal pulling force each time is 30 min-1 h; after the load of the last stage is loaded, the load of each stage is required to be unloaded to zero in a grading manner, the unloading capacity of each stage is the same as the loading increment, and when the load is unloaded, the load of each stage is maintained for 10min, then the pile body displacement measurement is carried out by using an inclinometer, after the load of the next stage is unloaded to zero, the pile body displacement measurement is carried out by using the inclinometer after 30min, and the residual displacement of the pile top is measured;
During the test of this step S6, the single pile horizontal load capacity test may terminate loading when one of the following occurs: 1) The horizontal loading value reaches the maximum loading value required by design; 2) The horizontal displacement of the pile body at the mud surface reaches the maximum displacement required by design;
and S7, loading horizontal pulling force to the two piles to be tested according to the test design of the step S6, and repeating the step S4 after horizontal force loading is carried out each time so as to respectively measure and obtain the verticality change results of the first pile body 9 and the second pile body 10 after the specified horizontal pulling force is loaded, and further judging whether the piles meet the construction design requirement according to the verticality change of the piles to be tested.
In the embodiment, the maximum load value of the horizontal loading value reaching the design requirement is 60kN, and the maximum displacement of the horizontal displacement of the pile body at the mud surface reaching the design requirement is 89.8057mm; the horizontal pulling force of the chain block 3 is loaded from 0kN, the loading increment of 20kN is gradually increased to 60kN, and the loading time of each horizontal pulling force is 30min. The displacement changes of the two piles are shown in table 1 below.
Table 1:
As can be seen from the test results in table 1, in the test of horizontal bearing capacity for the first pile body 9 and the second pile body 10, when the horizontal tension loading value reaches the maximum load of 60kN required by design, the horizontal displacement of the pile bodies of the two pile bodies is 33.25mm and 75.23mm respectively, which are smaller than the design control value 89.8057mm, and the construction requirements are met.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
1. The horizontal static load test device for the single pile of the offshore pile foundation is characterized by comprising a first horizontal tension loading device, a horizontal tension measuring device, a second horizontal tension loading device and a pile body horizontal displacement measuring device which are connected in sequence; the first horizontal tension loading device comprises a first steel wire rope (11) and a chain block (3); the two ends of the first steel wire rope (11) are connected through a first steel wire rope clip, so that the first steel wire rope (11) forms an annular rope body with an adjustable diameter; the movable lifting hook of the chain block (3) is connected to the first steel wire rope clip; the second horizontal tension loading device comprises a second steel wire rope (12), and two ends of the second steel wire rope are connected through a second steel wire rope clip, so that the second steel wire rope (12) forms an annular rope body with an adjustable diameter; the horizontal tension measuring device comprises a dynamometer (5), one end of the dynamometer is connected with a fixed lifting hook of the chain block (3), and the other end of the dynamometer is connected with a second steel wire rope clip; the pile body horizontal displacement measuring device comprises an inclinometer, a protective tube group and an inclinometer tube group; the protective tube group consists of two protective tubes (1), the inclinometer tube group consists of two inclinometer tubes, and the two inclinometer tube groups are inserted into the two protective tubes (1) in a way of being coaxially arranged with the protective tubes (1); at least two axial grooves are uniformly distributed on the inner wall of the inclinometer along the circumferential direction, and the groove depth of the axial grooves is adapted to the diameter of the roller wheels on the inclinometer probe, so that the rollers on two sides of the inclinometer probe are respectively embedded in the two axial grooves on the inner wall of the inclinometer.
2. The horizontal static load test device for the single pile of the offshore pile foundation according to claim 1, wherein the first horizontal tension loading device further comprises a first shackle (2) and a first connecting steel wire rope (14); the first shackle (2) is connected to the movable lifting hook of the chain block (3), so that the movable lifting hook of the chain block (3) is detachably connected to the first steel wire rope buckle through the first shackle (2); one end of the first connecting steel wire rope (14) is fixed on a fixed lifting hook of the chain block (3), and the other end of the first connecting steel wire rope is provided with a lifting ring.
3. The horizontal static load test device for the single pile of the offshore pile foundation according to claim 2, wherein the second horizontal tension loading device further comprises a fourth shackle (7) and a second connecting steel wire rope (15); wherein, the fourth shackle (7) is detachably connected to the second steel wire rope buckle; one end of the second connecting steel wire rope (15) is fixed on the fourth shackle (7), and the other end is provided with a hanging ring.
4. The horizontal static load test device for the single pile of the offshore pile foundation according to claim 3, wherein the second shackle (4) and the third shackle (6) are respectively connected to the hanging rings at the two ends of the dynamometer (5), one end of the dynamometer (5) is detachably connected to the hanging ring at the other end of the first connecting steel wire rope (14) through the second shackle (4), and the other end of the dynamometer (5) is detachably connected to the hanging ring at the other end of the second connecting steel wire rope (15) through the third shackle (6).
5. The horizontal static load test device for the single pile of the offshore pile foundation according to claim 4, wherein the protection pipe (1) is a steel pipe with an opening at the top and a closed bottom; the inclinometer is a PVC pipe with an opening at the top and a closed bottom.
6. The offshore pile foundation single pile horizontal static load test device according to claim 1, wherein the first steel wire rope (11), the second steel wire rope (12), the first connecting steel wire rope (14) and the second connecting steel wire rope (15) are steel wire ropes with the same specification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323169045.5U CN221218923U (en) | 2023-11-23 | 2023-11-23 | Horizontal static load test device for single pile of offshore pile foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323169045.5U CN221218923U (en) | 2023-11-23 | 2023-11-23 | Horizontal static load test device for single pile of offshore pile foundation |
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| CN221218923U true CN221218923U (en) | 2024-06-25 |
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| CN202323169045.5U Active CN221218923U (en) | 2023-11-23 | 2023-11-23 | Horizontal static load test device for single pile of offshore pile foundation |
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