CN216664253U - Double-load-box test structure of ultra-long test pile - Google Patents
Double-load-box test structure of ultra-long test pile Download PDFInfo
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- CN216664253U CN216664253U CN202122758182.7U CN202122758182U CN216664253U CN 216664253 U CN216664253 U CN 216664253U CN 202122758182 U CN202122758182 U CN 202122758182U CN 216664253 U CN216664253 U CN 216664253U
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- 238000012360 testing method Methods 0.000 title claims abstract description 124
- 238000006073 displacement reaction Methods 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 230000002787 reinforcement Effects 0.000 claims description 12
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 2
- 238000007569 slipcasting Methods 0.000 claims 3
- 238000002474 experimental method Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of pile foundation experiments, in particular to a double-load-box test structure of an overlong test pile. The middle part of the test pile is provided with an upper load box and a lower load box at intervals, the test pile is divided into an upper part, a middle part and a lower part by the two load boxes, each part of the test pile is provided with a displacement rod, the displacement rods extend upwards to the top of the test pile and are connected with displacement detection equipment, and a protection pipe is sleeved outside the displacement rods and used for isolating concrete and avoiding the adhesion of the concrete and the displacement rods; a plurality of secondary grouting pipes are pre-buried in the test pile and arranged around the edge of the test pile at intervals, and the secondary grouting pipes are provided with nozzles facing the outer side of the test pile.
Description
Technical Field
The utility model relates to the technical field of pile foundation experiments, in particular to a double-load box test structure for an overlong test pile.
Background
The design parameters of the pile foundation are generally determined by calculation from geological survey reports. The bearing capacity and the calculation result of the final pile foundation of some simple stratums are not very different, but the numerical value provided by a geological report in a region with a complicated geological structure is always conservative, and the site geological condition and the pile body material cannot be fully exerted. Therefore, an experimental pile is manufactured in advance in a region with similar geological conditions near the site before actual construction of the pile foundation and is used for testing the actual stress condition of the pile foundation.
The existing test pile test is to place a weight on the top of the test pile and then test the displacement condition of the test pile. Or erecting a reaction frame around the test pile, and connecting the reaction frame with the test pile through hydraulic equipment for testing the stress condition of the test pile. The traditional static load test detection method has the defects of limited ballast tonnage, high test cost, long test period, harsh test site conditions and the like.
And in some places, a loading box is arranged in the test pile for loading. The load box is hydraulic equipment arranged in the test pile, and is pressurized and loaded, so that the load box generates forces in the upper direction and the lower direction and transmits the forces to the pile body, a series of data such as pile foundation bearing capacity, pile end bearing capacity, side frictional resistance, frictional resistance conversion coefficient and the like are obtained, and the single pile bearing capacity of the pile foundation is finally measured.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a double-load-box test structure of an overlong test pile.
The technical problem to be solved is that: when the length of the test pile is long, the test structure of the single load box is difficult to accurately measure different stress conditions of the test pile, and the existing load box test pile can only be tested once.
In order to solve the technical problem, the utility model discloses a double-load-box test structure of an ultralong test pile, which adopts the following scheme.
A double-load-box test structure of an ultra-long test pile is characterized in that an upper load box and a lower load box are arranged at intervals in the middle of the test pile, the two load boxes divide the test pile into an upper part, a middle part and a lower part,
each part of the test pile is provided with a displacement rod, the displacement rods extend upwards to the top of the test pile and are connected with displacement detection equipment, and a protection pipe is sleeved outside the displacement rods and used for isolating concrete and avoiding the concrete from being bonded with the displacement rods;
a plurality of secondary grouting pipes are pre-buried in the test pile and surround the edge of the test pile at intervals, and the secondary grouting pipes are provided with nozzles facing the outer side of the test pile.
Preferably, a bursting disc is arranged at the nozzle of the secondary grouting pipe.
Preferably, the upper part, the middle part and the lower part of the test pile are respectively provided with a separate reinforcement cage; and the upper end and the lower end of the load box are respectively connected with the end parts of the two reinforcement cages.
Preferably, the load box includes load box and lower load box, and the load box passes through the hydraulic pressure pipe and is connected with the hydraulic equipment on ground, and the hydraulic pressure pipe overcoat of lower load box is equipped with protective case.
Preferably, the load box is annular, and the centre has the equipment passageway, and concrete mortar and vibration equipment can pass through the equipment passageway.
Preferably, a guide mechanism is arranged above the equipment channel, the guide mechanism is in a horn shape with an upward opening, and a smaller opening is aligned with the equipment channel.
Preferably, an equipment pipe is arranged in the test pile, the load box is provided with a through hole at the equipment pipe, and the end part of the equipment pipe is connected with the load box.
Preferably, the upper part, the middle part and the lower part of the test pile are provided with stress meters, and cables of the stress meters are communicated to the outside through the equipment pipes.
Compared with the prior art, the double-load-box test structure of the overlong test pile has the following beneficial effects:
in the utility model, two load boxes are arranged in the test pile, and the stress condition of the test pile can be measured by the different states of the two load boxes. As shown in fig. 1.
Stage one: closing the upper load box, wherein the (upper + middle) section piles are connected into a whole, and the bearing capacity is greater than that of the lower section piles; and loading the lower load box, and measuring the bearing capacity of the lower section pile.
And a second stage: opening a lower load box (at the moment, the pile bottom of the middle-section pile is dislocated approximately and is not stressed), wherein the bearing capacity of the middle-section pile is smaller than that of the upper-section pile; and loading the upper load box, and measuring the bearing capacity of the middle-section pile.
And a third stage: closing the lower load box, wherein the (middle and lower) section piles are connected into a whole, and the bearing capacity is greater than that of the upper section pile; and loading the upper load box, and measuring the bearing capacity of the upper section pile.
And after the primary measurement is finished, spraying concrete slurry into the stratum around the test pile through a secondary grouting pipe, increasing the hardness of the bottom layer and the bonding strength with the test pile, and then testing again. And whether secondary grouting is needed for the final pile foundation or not, and the grouting position and the grouting amount can be adjusted according to the test result.
The test pile is manufactured by firstly placing the reinforcement cage together with the load box into the pile hole as shown in fig. 1, then pouring concrete, spraying water into the secondary grouting pipe before the concrete is solidified, and enabling the water to be sprayed out from the nozzle to reopen the edge of the test pile and be communicated with the external stratum. And then carrying out the first test on the test pile to obtain data, grouting into the stratum through a secondary grouting pipe, and then carrying out the second test to obtain the stress data of the test pile after grouting.
Drawings
FIG. 1 is a schematic structural diagram of a reinforcement cage and a load box in a double-load box test structure of an ultralong test pile according to the utility model;
fig. 2 is an enlarged view at a in fig. 1.
Description of reference numerals:
1-load box, 1 a-equipment channel, 1 b-via hole;
2-a reinforcement cage;
3-secondary grouting pipe;
4-a guiding mechanism;
5-equipment pipe.
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, the use of the directional terms such as "upper, lower, left, right" generally means upper, lower, left, right as shown in reference to fig. 1, unless otherwise specified; "inner and outer" refer to the inner and outer relative to the profile of the components themselves. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to solve when experimental stake length is longer, the problem of the different atress condition of single load case 1's test structure difficult to the accurate measurement experimental stake, current load case 1 test stake can only carry out the test once moreover. The utility model provides a double-load-box test structure of an overlong test pile, which is shown in figures 1 and 2.
A double-load-box test structure of an ultra-long test pile is characterized in that an upper load box 1 and a lower load box 1 are arranged at intervals in the middle of the test pile, the two load boxes 1 divide the test pile into an upper part, a middle part and a lower part,
each part of the test pile is provided with a displacement rod, the displacement rods extend upwards to the top of the test pile and are connected with displacement detection equipment, and a protection pipe is sleeved outside the displacement rods and used for isolating concrete and avoiding the concrete from being bonded with the displacement rods;
a plurality of secondary grouting pipes 3 are pre-buried in the test pile, the secondary grouting pipes 3 surround the edge of the test pile at intervals, and the secondary grouting pipes 3 are provided with nozzles facing the outer side of the test pile.
As shown in fig. 1, the two load boxes 1 are designated for convenience of description as an upper load box 1 above and a lower load box 1 below. The two load boxes 1 are divided into three parts from two positions to separate the test piles, and are named as an upper test pile and a lower test pile for convenience of description. The external diameter of load case 1 is the same with the external diameter of steel reinforcement cage 2, and load case 1 inlays between two steel reinforcement cages 2. And the upper end and the lower end of the load box 1 are connected with the reinforcement cage 2.
The displacement rod is used for transmitting displacement information of the three parts of the test pile to the outside of the test pile and is connected with detection equipment connected with the displacement rod through the outer side of the test pile. When only one load box 1 is a displacement rod, the displacement rod is simple, and the displacement rod is connected with the top of the load box 1 and then extends upwards to the outer side of the test pile. However, when the test pile is divided into three parts by the two load boxes 1, the displacement transmission of the middle test pile and the lower test pile occurs, and the upper test pile is adhered to the displacement rod after the concrete is poured. Therefore, a protection pipe is sleeved on the outer side of the displacement rod, the protection pipe is connected with the load box 1, and the load box 1 is provided with a hole with the same inner diameter as the protection pipe. The protection tube is fixedly bonded with the concrete, and the displacement rod can slide in the protection tube.
In order to test the stress condition of the test pile after the secondary grouting. There is also a secondary grouting pipe 3 inside the test pile, the spout of the secondary grouting pipe 3 facing radially outwards of the test pile. And a blasting sheet is arranged at the nozzle of the secondary grouting pipe 3. The rupture disk can prevent mortar from flowing into the secondary grouting pipe 3 when concrete is poured into the test pile. And if necessary, pressurizing the secondary grouting pipe 3 to burst the rupture disk.
The upper part, the middle part and the lower part of the test pile are respectively provided with a single reinforcement cage 2; the upper end and the lower end of the load box 1 are respectively connected with the end parts of the two reinforcement cages 2. So that each section of test pile can be moved independently.
Load case 1 includes load case 1 and load case 1 down, and load case 1 is connected with the hydraulic equipment on ground through the hydraulic pressure pipe, and the hydraulic pressure pipe overcoat of load case 1 down is equipped with protective case. Avoiding breaking the hydraulic pipe of the lower load box 1 when the upper load box 1 extends.
Because the test pile needs to be poured with concrete, the load box 1 is annular, the middle of the load box is provided with an equipment channel 1a, and concrete mortar and vibration equipment can penetrate through the equipment channel 1 a.
And in order for the tamper equipment or other detection equipment to be able to pass smoothly through the equipment tunnel 1 a. A guide mechanism 4 is arranged above the equipment channel 1a, and the guide mechanism 4 is in a horn shape with an upward opening and a smaller opening aligned with the equipment channel 1 a.
Be provided with equipment pipe 5 in the experimental stake, load box 1 has via hole 1b in equipment pipe 5 department, and the tip and the load box 1 of equipment pipe 5 are connected. The pipelines such as hydraulic pipes, sounding pipes, displacement rods and secondary grouting pipes 3 which need to pass through the load box 1 all pass through the load box 1 through the through holes 1 b.
And the broken line pipeline such as the hydraulic pipe, the displacement rod and the flaw detection inspection equipment mentioned in the foregoing is also arranged in the equipment pipe, for example, the upper part, the middle part and the lower part of the test pile are all provided with stress meters, and cables of the stress meters are communicated to the outside through the equipment pipe 5.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (8)
1. A double-load-box test structure of an ultra-long test pile is characterized in that an upper load box (1) and a lower load box (1) are arranged at intervals in the middle of the test pile, the two load boxes (1) divide the test pile into an upper part, a middle part and a lower part,
each part of the test pile is provided with a displacement rod, the displacement rods extend upwards to the top of the test pile and are connected with displacement detection equipment, and a protection pipe is sleeved outside the displacement rods and used for isolating concrete and avoiding the concrete from being bonded with the displacement rods;
it is provided with a plurality of secondary slip casting pipes (3) to pre-buried in experimental stake, and is a plurality of secondary slip casting pipe (3) encircle the marginal interval of experimental stake sets up to secondary slip casting pipe (3) are last to have the spout towards the experimental stake outside.
2. The double load box test structure of the overlength test pile according to claim 1, characterized in that a blasting sheet is arranged at the nozzle of the secondary grouting pipe (3).
3. The double load box test structure of the overlength test pile according to claim 1, wherein the upper, middle and lower three parts of the test pile are respectively provided with a single reinforcement cage (2); the upper end and the lower end of the load box (1) are respectively connected with the end parts of the two reinforcement cages (2).
4. The double-load-box test structure of the overlong test pile, as claimed in claim 1, wherein the load box (1) comprises an upper load box (1) and a lower load box (1), the load box (1) is connected with a hydraulic device on the ground through a hydraulic pipe, and a protective sleeve is sleeved outside the hydraulic pipe of the lower load box (1).
5. The double load box test structure of the overlength test pile according to claim 1, wherein the load box (1) is ring-shaped, and has an equipment passage (1 a) in the middle, and concrete mortar and vibration equipment can pass through the equipment passage (1 a).
6. The double load box test structure of the overlength test pile according to claim 5, characterized in that a guide mechanism (4) is arranged above the equipment channel (1 a), the guide mechanism (4) is in a horn shape with an upward opening, and a smaller opening is aligned with the equipment channel (1 a).
7. The double load box test structure of the overlength test pile according to claim 1, characterized in that an equipment pipe (5) is arranged in the test pile, the load box (1) is provided with a through hole (1 b) at the equipment pipe (5), and the end of the equipment pipe (5) is connected with the load box (1).
8. The double load box test structure of the overlength test pile according to claim 7, characterized in that the upper, middle and lower three parts of the test pile are provided with stress gauges, and the cables of the stress gauges are communicated to the outside through the equipment pipe (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122758182.7U CN216664253U (en) | 2021-11-11 | 2021-11-11 | Double-load-box test structure of ultra-long test pile |
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| CN202122758182.7U CN216664253U (en) | 2021-11-11 | 2021-11-11 | Double-load-box test structure of ultra-long test pile |
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| CN216664253U true CN216664253U (en) | 2022-06-03 |
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| CN202122758182.7U Expired - Fee Related CN216664253U (en) | 2021-11-11 | 2021-11-11 | Double-load-box test structure of ultra-long test pile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115233752A (en) * | 2022-08-31 | 2022-10-25 | 湖北工业大学 | Reverse self-balancing pile testing method based on double pile body load boxes |
| CN117127666A (en) * | 2023-10-27 | 2023-11-28 | 山西机械化建设集团有限公司 | Foundation pile negative friction resistance blocking type test element and mounting method |
-
2021
- 2021-11-11 CN CN202122758182.7U patent/CN216664253U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115233752A (en) * | 2022-08-31 | 2022-10-25 | 湖北工业大学 | Reverse self-balancing pile testing method based on double pile body load boxes |
| CN117127666A (en) * | 2023-10-27 | 2023-11-28 | 山西机械化建设集团有限公司 | Foundation pile negative friction resistance blocking type test element and mounting method |
| CN117127666B (en) * | 2023-10-27 | 2024-01-26 | 山西机械化建设集团有限公司 | Foundation pile negative friction resistance blocking type test element and mounting method |
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