CN112878397A - Use method of deep layer load test equipment in open caisson construction period - Google Patents
Use method of deep layer load test equipment in open caisson construction period Download PDFInfo
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- CN112878397A CN112878397A CN202110261872.3A CN202110261872A CN112878397A CN 112878397 A CN112878397 A CN 112878397A CN 202110261872 A CN202110261872 A CN 202110261872A CN 112878397 A CN112878397 A CN 112878397A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A method of using a deep layer load testing apparatus during open caisson construction, the apparatus comprising: a counterforce device, a loading device, a displacement limiting device and a displacement measuring device, the method comprising the steps of: arranging the displacement measuring device on the loading device; connecting the loading device to a second end of the counterforce device; arranging the displacement limiting device on the outer side wall of the counterforce device; extending the second end of the counterforce device into the open caisson test hole, and connecting the first end of the counterforce device with the open caisson main body structure; operating the loading device to test the test soil in the open caisson test hole; and observing the vertical displacement of the loading device through the displacement measuring device. The real displacement of bearing plate can directly be obtained to this application, significantly reduced because experimental degree of depth and reaction device warp the experimental error that causes.
Description
Technical Field
The invention belongs to the technical field of deep load tests, and particularly relates to a using method of deep load test equipment in an open caisson construction period.
Background
With the development of domestic and foreign traffic construction in recent years, the bridge span is continuously increased, and the requirements on the bearing capacity and settlement of the bridge foundation are continuously improved. The open caisson foundation is an important form of a deep foundation, has the advantages of good integrity, high bearing capacity, large structural strength, small deformation and the like, and is increasingly widely applied to large bridges. In order to exert the bearing capacity, the open caisson foundation needs to overcome the sinking resistance by taking soil in the well, and bottom sealing operation is carried out after the open caisson foundation continuously sinks and gradually heightens the shaft to reach the designed elevation.
The key of open caisson construction lies in ensuring stable and smooth sinking, and scholars at home and abroad use various methods such as a physical simulation method, an empirical formula method, a numerical analysis method and a numerical simulation method to research the open caisson construction process so as to ensure safe and stable sinking of the open caisson. How to obtain the relatively reasonable soil mass ultimate bearing capacity and key mechanical parameters in the sinking process of the open caisson is the foundation of open caisson sinking construction research.
The bearing capacity and the mechanical parameters of the soil body in the open caisson construction period have larger difference with the numerical values obtained in geological exploration, which is mainly because the soil body is disturbed by the increase of the soil penetration depth of the blade foot and the soil borrowing construction operation of engineering machinery during the open caisson construction period, so that the mechanical behavior of the soil body near the blade foot is changed, and the change is mainly shown as the increase or decrease of the soil body strength, the change of the soil body deformation modulus and the like. The ultimate bearing capacity of the soil body is the key of the open caisson sinking coefficient calculation, the soil body parameters are the basis for reasonably predicting the soil taking sinking, and the bearing capacities of the soil bodies determined by different soil body parameters are different, so that the accurate ultimate bearing capacity of the soil body and the key mechanical parameters are obtained, and the method has important significance for reasonably simulating the mechanical behavior of the soil body, predicting the open caisson sinking, ensuring the open caisson sinking construction safety and the like.
The deep layer load test equipment is common equipment for testing the mechanical behavior of the deep layer soil body on site, and a loading displacement curve of the deep layer soil body can be obtained through a test to obtain the ultimate bearing capacity of the soil body, so that corresponding soil body mechanical parameters are determined. However, in the prior art, there is no feasible device for carrying out a deep load test in the open caisson construction period, and other soil body in-situ test devices can not test the soil body near the open caisson cutting edge in the open caisson construction stage. The existing deep-layer load test equipment can not be directly applied to a load test during open caisson construction or applied to the load test during open caisson construction through simple improvement, so that the ultimate bearing capacity and key mechanical parameters of a soil body near a blade foot in the open caisson construction stage can not be obtained through a field test.
Disclosure of Invention
In view of the above, the present invention provides a method of using a deep loading test apparatus during open caisson construction which overcomes or at least partially solves the above problems.
In order to solve the technical problem, the invention provides a use method of deep layer load test equipment in open caisson construction period, which comprises the following steps: a counterforce device, a loading device, a displacement limiting device and a displacement measuring device, the method comprising the steps of:
arranging the displacement measuring device on the loading device;
connecting the loading device to a second end of the counterforce device;
arranging the displacement limiting device on the outer side wall of the counterforce device;
extending the second end of the counterforce device into the open caisson test hole, and connecting the first end of the counterforce device with the open caisson main body structure;
operating the loading device to test the test soil in the open caisson test hole;
and observing the vertical displacement of the loading device through the displacement measuring device.
Preferably, the reaction force device includes: the device comprises a counter-force steel pipe and a counter-force beam, wherein the counter-force beam is connected with the open caisson main body structure, a first end of the counter-force steel pipe is connected with the counter-force beam, a second end of the counter-force steel pipe extends into the open caisson test hole and is connected with the loading device, the displacement limiting device is arranged on the outer side wall of the counter-force steel pipe, and the displacement measuring device is arranged in the counter-force steel pipe.
Preferably, the first end of the reaction steel pipe is connected to the reaction beam by a rib.
Preferably, the second end of the reaction steel pipe is connected with the loading device through a rib plate.
Preferably, the loading device includes: the device comprises a hydraulic telescopic piece, a connecting plate, a bearing plate and an oil pipe, wherein the fixed end of the hydraulic telescopic piece is connected with the first surface of the connecting plate, the movable end of the hydraulic telescopic piece is connected with the first surface of the bearing plate, the second surface of the connecting plate is connected with the second end of a counter-force steel pipe in a counter-force device, the first end of the oil pipe is connected with the hydraulic telescopic piece, the second end of the oil pipe is connected with an external oil pump, and the hydraulic telescopic piece controls the bearing plate to lift and move in an open caisson test hole and enables the second surface of the bearing plate to be in contact with or separated from a test soil body.
Preferably, the loading device further comprises: and the protective sleeve is arranged in the open caisson test hole, surrounds the hydraulic telescopic piece and is connected with the first surface of the connecting plate.
Preferably, the displacement limiting means comprises: the protection device comprises a protection cylinder, a bearing and a spring, wherein the protection cylinder is connected with a counter-force steel pipe in the counter-force device and extends out of the counter-force steel pipe, the spring is arranged in the protection cylinder, the first end of the spring is connected with the inner wall of the protection cylinder, the second end of the spring is connected with the bearing, and the bearing is tightly abutted to the inner wall of the open caisson test hole in a sliding mode.
Preferably, the displacement limiting means further comprises: the central column is arranged in the protective cylinder, a first end of the central column extends out of the protective cylinder, a second end of the central column is connected with the bearing, and the central column is sleeved with the spring.
Preferably, the displacement measuring device includes: the displacement device comprises a displacement rod and a displacement observation instrument, wherein the displacement rod is arranged in a reaction steel pipe in the reaction device, a first end of the displacement rod is connected with a bearing plate in the loading device, a second end of the displacement rod extends out of the top of a reaction cross beam in the reaction device, and the displacement observation instrument is connected with the second end of the displacement rod.
Preferably, the displacement measuring device further includes: and the positioning ring is arranged on the inner side wall of the counterforce steel pipe and sleeved on the displacement rod.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages: the application provides a method for using deep load test equipment during open caisson construction period can directly acquire the real displacement of the bearing plate (namely the accurate loading displacement of the test), and greatly reduces the test error caused by the test depth and the deformation of the counterforce device.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic overall structure diagram of a deep layer load test device in open caisson construction period according to an embodiment of the present invention;
FIG. 2 is a top view of FIG. 1;
fig. 3 is a schematic structural diagram of a loading device in a deep layer load test device during open caisson construction period according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a displacement limiting device in a deep layer load test device during open caisson construction according to an embodiment of the present invention;
fig. 5 is a top view of a displacement limiting device in a deep loading test apparatus during open caisson construction according to an embodiment of the present invention;
fig. 6 is an enlarged schematic structural diagram of a displacement limiting device in a deep layer load test device during open caisson construction according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Referring to fig. 1 to 6, in an embodiment of the present application, the present invention provides a deep layer load testing apparatus for open caisson construction, including:
the counter-force device is used for fixing the loading device and providing counter-force for the loading device during testing; the first end of the counterforce device is connected with the open caisson main body structure at the open caisson test hole, and the second end of the counterforce device extends into the open caisson test hole;
the loading device is used for testing the test soil in the open caisson test hole; the loading device is arranged in the open caisson test hole and is connected with the second end of the counterforce device;
a displacement limiting device 8 for limiting the horizontal displacement of the counterforce device in the open caisson test hole; the displacement limiting device 8 is arranged on the outer side wall of the counterforce device and is tightly abutted against the inner side wall of the open caisson test hole;
the displacement measuring device is used for measuring the vertical displacement of the loading device; the displacement measuring device is connected with the loading device.
In the embodiment of the application, when the deep layer load test device in the open caisson construction period is used, the displacement measuring device is arranged on the loading device, the loading device is connected with the second end of the counterforce device, then the second end of the counterforce device extends into the open caisson test hole, and the first end of the counterforce device is connected with the open caisson main structure; and then operating the loading device to test the test soil in the open caisson test hole, and observing the vertical displacement of the loading device through the displacement measuring device.
In the embodiment of the present application, as shown in fig. 1 to 6, the reaction force device includes: the open caisson structure comprises a reaction steel pipe 5 and a reaction cross beam 6, wherein the reaction cross beam 6 is connected with the open caisson main structure, the first end of the reaction steel pipe 5 is connected with the reaction cross beam 6, the second end of the reaction steel pipe extends into the open caisson test hole and is connected with the loading device, the displacement limiting device 8 is arranged on the outer side wall of the reaction steel pipe 5, and the displacement measuring device is arranged in the reaction steel pipe 5.
In the embodiment of the present application, the reaction beam 6 is connected to the open caisson main structure and located outside the open caisson test hole, and the first end of the reaction steel tube 5 is connected to the reaction beam 6 and the second end of the reaction steel tube extends into the open caisson test hole and is connected to the loading device.
As shown in fig. 1 to 6, in the embodiment of the present invention, the first end of the reaction steel pipe 5 is connected to the reaction beam 6 via a rib 7. The rib 7 enhances the connection between the reaction steel tube 5 and the reaction beam 6.
In the embodiment of the present application, as shown in fig. 1 to 6, the second end of the reaction steel tube 5 is connected to the loading device through a rib 7. The rib 7 can enhance the connection effect between the reaction steel pipe 5 and the loading device.
In the embodiment of the present application, the reaction beam 6 has a double-row i-steel structure, and the rib plate 7 may be additionally installed on the i-steel web side of the reaction beam 6, and the rib plate 7 may enhance the rigidity of the reaction beam 6.
As shown in fig. 1 to 6, in the embodiment of the present application, the loading device includes: the device comprises a hydraulic telescopic piece 1, a connecting plate 2, a bearing plate 3 and an oil pipe 9, wherein the fixed end of the hydraulic telescopic piece 1 is connected with the first surface of the connecting plate 2, the movable end of the hydraulic telescopic piece is connected with the first surface of the bearing plate 3, the second surface of the connecting plate 2 is connected with the second end of a counter-force steel pipe 5 in a counter-force device, the first end of the oil pipe 9 is connected with the hydraulic telescopic piece 1, the second end of the oil pipe is connected with an external oil pump, the hydraulic telescopic piece 1 controls the bearing plate 3 to move up and down in a sunk well test hole, and the second surface of the bearing plate 3 is in contact with or separated from a test soil body.
In this application embodiment, hydraulic telescoping member 1 is by external oil pump power, and the oil pump passes through oil pipe 9 and links to each other with hydraulic telescoping member 1, and the rising and the reduction of oil pressure in the oil pump can control hydraulic telescoping member 1 to realize the loading and the uninstallation of hydraulic telescoping member 1, oil pipe 9 and oil pump connection position have arranged the oil pressure gauge, are used for measuring the oil pressure, confirm the test load that bearing plate 3 bore in the test process.
In the embodiment of the application, the hydraulic telescopic part 1 is a hydraulic oil cylinder or a hydraulic jack, the connecting plate 2 is connected with the hydraulic telescopic part 1 through a bolt, and the bearing plate 3 is connected with the hydraulic telescopic part 1 through a bolt.
In the embodiment of the application, the connecting plate 2 is a disc, the bearing plate 3 is a disc, the protective sleeve 4 is a hollow round pipe, and the whole loading device is cylindrical.
As shown in fig. 1 to 6, in the embodiment of the present application, the loading device further includes: and the protective sleeve 4 is arranged in the open caisson test hole, surrounds the hydraulic telescopic piece 1 and is connected with the first surface of the connecting plate 2.
In this application embodiment, hydraulic telescoping piece 1 sets up in protective sheath 4, and hydraulic telescoping piece 1 can set up one or more, and quantity is confirmed according to the soil body type and the hydro-cylinder model of awaiting measuring.
As shown in fig. 1 to 6, in the present embodiment, the displacement limiting device 8 includes: the protection device comprises a protection cylinder 13, a bearing 15 and a spring 16, wherein the protection cylinder 13 is connected with a reaction steel pipe 5 in the reaction device and extends out of the reaction steel pipe 5, the spring 16 is arranged in the protection cylinder 13, a first end of the spring 16 is connected with the inner wall of the protection cylinder 13, a second end of the spring 16 is connected with the bearing 15, and the bearing 15 is tightly abutted to the inner wall of the open caisson test hole in a sliding manner.
In the embodiment of the present application, the displacement limiting devices 8 are located around the reaction steel pipe 5, a set of displacement limiting devices 8 is arranged at a certain height along the vertical direction, each set is composed of a plurality of identical displacement limiting devices 8, and the plurality of displacement limiting devices 8 are uniformly distributed on the horizontal circumference of the reaction steel pipe 5.
In the present embodiment, a set of displacement defining means 8 is arranged every 10m in the vertical direction, each set comprising 3 displacement defining means 8. The bearing 15 is in contact with the inner wall of the mud sucking hole and can roll up and down along the inner wall. The plurality of displacement limiting devices 8 work together to keep the reaction steel pipe 5 in the vertical direction.
As shown in fig. 1 to 6, in the embodiment of the present application, the displacement limiting device 8 further includes: the central column 14 is disposed inside the protection cylinder 13, a first end of the central column 14 extends out of the protection cylinder 13, a second end of the central column is connected with the bearing 15, and the spring 16 is sleeved on the central column 14.
In the embodiment of the present application, the central pillar 14 is located in the protection cylinder 13, one end of the central pillar is connected to the bearing 15, the other end of the central pillar extends out of the protection cylinder 13, and the nut connected to the protection cylinder 13 limits the excessive displacement of the central pillar 14 to prevent the central pillar 14 from coming off the protection cylinder 13, and the spring 16 is located between the central pillar 14 and the protection cylinder 13, and the three are coaxial.
As shown in fig. 1 to 6, in the embodiment of the present application, the displacement measuring device includes: the displacement device comprises a displacement rod 10 and a displacement observation instrument 11, wherein the displacement rod 10 is arranged in a reaction steel pipe 5 in the reaction device, a first end of the displacement rod is connected with a bearing plate 3 in the loading device, a second end of the displacement rod extends out of the top of a reaction beam 6 in the reaction device, and the displacement observation instrument 11 is connected with the second end of the displacement rod 10.
In the embodiment of the present application, the displacement rod 10 is connected to the pressure-bearing plate 3 for reflecting the bottom surface displacement of the hydraulic expansion piece 1 during the loading test, the displacement observation instrument 11 is disposed at the top end of the displacement rod 10 for measuring the displacement of the displacement rod 10, and the displacement of the displacement rod 10 is the displacement of the connected pressure-bearing plate 3, that is, the displacement of the bottom surface of the hydraulic expansion piece 1.
In the embodiment of the present application, four displacement rods 10 are all connected to the pressure-bearing plate 3, and during measurement, an average displacement value of the four displacement rods 10 connected to the pressure-bearing plate 3 is obtained as the displacement of the pressure-bearing plate 3.
Further, in the embodiment of the present application, the displacement rod 10 has a standard length of 3m, and can be adapted to different test depths by splicing.
As shown in fig. 1 to 6, in the embodiment of the present application, the displacement measuring device further includes: and the positioning ring 12 is arranged on the inner side wall of the reaction steel pipe 5 and sleeved on the displacement rod 10.
In the embodiment of the present application, a layer of positioning rings 12 is disposed inside the counterforce steel pipe 5 at a certain height along the vertical direction, and the number of each layer of positioning rings 12 is the same as that of the displacement rods 10, so as to ensure that the corresponding displacement rods 10 only move along the vertical direction.
In the present embodiment, the displacement rod positioning rings 12 are arranged in every 3m layer along the vertical direction, and each layer includes four displacement rod positioning rings 12.
The application also provides a use method of the deep load test equipment in the open caisson construction period, and the equipment comprises the following steps: a counterforce device, a loading device, a displacement defining device 8 and a displacement measuring device, the method comprising the steps of:
arranging the displacement measuring device on the loading device;
connecting the loading device to a second end of the counterforce device;
arranging the displacement limiting device on the outer side wall of the counterforce device;
extending the second end of the counterforce device into the open caisson test hole, and connecting the first end of the counterforce device with the open caisson main body structure;
operating the loading device to test the test soil in the open caisson test hole;
and observing the vertical displacement of the loading device through the displacement measuring device.
In the embodiment of the application, when the deep layer load test equipment in the open caisson construction period is used, firstly, the test equipment is installed, the number of the reaction steel pipes 5 and the number of the displacement rods 10 which need to be used are determined according to the sinking depth of the open caisson, and the displacement rods 10 are pre-connected in each section of the reaction steel pipe 5, so that the lengths of each section of the reaction steel pipe 5 correspond to the lengths of the displacement rods 10; positioning the position of the displacement rod 10, welding a positioning ring 12, and placing the displacement rod 10 into the positioning ring 12; splicing the oil pipes 9, and temporarily binding and fixing the oil pipes 9 in each section of the reaction steel pipe 5; welding the first section of the reaction steel pipe 5 and the loading device together; secondly, transfer the loading apparatus: placing the first section of the reaction steel pipe 5 and the loading device into the test hole; lifting the counter-force steel pipes 5 section by section and putting the counter-force steel pipes into the open caisson mud suction hole, wherein the displacement rods 10, the oil pipes 9 and the counter-force steel pipes 5 are sequentially connected in the putting process, and the oil pipes 9 need to be formally bound and fixed on the inner walls of the counter-force steel pipes 5; the loading device is put down to the bottom of the open caisson; then, a load test was performed: carrying out graded loading according to the deep flat plate load test specification requirement, measuring the displacement of the displacement rod 10 according to the requirement, recording the oil pressure value measured by the oil pressure gauge, terminating the loading after reaching the loading termination condition, and then carrying out graded unloading, wherein the oil pressure and the displacement are observed and recorded in the unloading process; finally, the test equipment was removed: the test equipment is lifted and taken out by utilizing equipment such as a tower crane, the joint of each section of the reaction steel pipe 5 is cut off in the taking-out process, the reaction steel pipe 5, the displacement rod 10 and the oil pipe 9 are taken out section by section, the cyclic use is convenient, and after the loading device is taken out, the displacement of the hydraulic telescopic part is reset to zero, so that the next test can be conveniently and cyclically used.
The structure of the deep layer load test equipment in the open caisson construction period is matched with the open caisson main structure, a load test can be carried out on the soil body near the blade foot at the current open caisson sinking depth at any depth in the open caisson construction period, a soil body loading displacement curve is obtained, the real limit bearing capacity of the soil body is determined, the key soil body mechanical parameters reflecting the actual state of the tested soil body are obtained, and researchers can accurately master the mechanical behavior of the soil body near the blade foot in the open caisson construction period; different from the traditional deep layer load test loading device which loads on the ground, the loading device is positioned below the counterforce device, and the hydraulic telescopic part in the equipment is directly connected with the bearing plate which is in contact with the test soil body, so that the real displacement of the bearing plate (namely the accurate loading displacement of the test) can be directly obtained, and the test error caused by the test depth and the deformation of the counterforce device is greatly reduced; by means of the displacement rod connected to the bearing plate, a measurer can be located on the open caisson construction platform to measure and observe conveniently and visually; deep load test equipment can adapt to the deep load test requirement of different depth soil bodies through the concatenation during open caisson construction period, and test equipment easy dismounting conveniently uses repeatedly.
The application provides a loading device can directly acquire the true displacement of bearing plate (be experimental accurate loading displacement promptly), greatly reduced because experimental degree of depth and reaction device warp the experimental error that causes.
The application provides a method for using deep load test equipment during open caisson construction period can directly acquire the real displacement of the bearing plate (namely the accurate loading displacement of the test), and greatly reduces the test error caused by the test depth and the deformation of the counterforce device.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
In short, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A use method of deep layer load test equipment in open caisson construction period is characterized in that the equipment comprises: a counterforce device, a loading device, a displacement limiting device and a displacement measuring device, the method comprising the steps of:
arranging the displacement measuring device on the loading device;
connecting the loading device to a second end of the counterforce device;
arranging the displacement limiting device on the outer side wall of the counterforce device;
extending the second end of the counterforce device into the open caisson test hole, and connecting the first end of the counterforce device with the open caisson main body structure;
operating the loading device to test the test soil in the open caisson test hole;
and observing the vertical displacement of the loading device through the displacement measuring device.
2. The method for using the deep loading test equipment in the open caisson construction period, as claimed in claim 1, wherein the counterforce device comprises: the device comprises a counter-force steel pipe and a counter-force beam, wherein the counter-force beam is connected with the open caisson main body structure, a first end of the counter-force steel pipe is connected with the counter-force beam, a second end of the counter-force steel pipe extends into the open caisson test hole and is connected with the loading device, the displacement limiting device is arranged on the outer side wall of the counter-force steel pipe, and the displacement measuring device is arranged in the counter-force steel pipe.
3. The method for using the deep load test equipment in the open caisson construction period as claimed in claim 2, wherein the first end of the reaction steel pipe is connected with the reaction beam through a rib plate.
4. The method for using the deep load test equipment in the open caisson construction period as claimed in claim 2, wherein the second end of the counterforce steel pipe is connected with the loading device through a rib plate.
5. The method for using the deep loading test equipment in the open caisson construction period as claimed in claim 1, wherein the loading device comprises: the device comprises a hydraulic telescopic piece, a connecting plate, a bearing plate and an oil pipe, wherein the fixed end of the hydraulic telescopic piece is connected with the first surface of the connecting plate, the movable end of the hydraulic telescopic piece is connected with the first surface of the bearing plate, the second surface of the connecting plate is connected with the second end of a counter-force steel pipe in a counter-force device, the first end of the oil pipe is connected with the hydraulic telescopic piece, the second end of the oil pipe is connected with an external oil pump, and the hydraulic telescopic piece controls the bearing plate to lift and move in an open caisson test hole and enables the second surface of the bearing plate to be in contact with or separated from a test soil body.
6. The method for using the deep loading test equipment in the open caisson construction period of claim 5, wherein the loading device further comprises: and the protective sleeve is arranged in the open caisson test hole, surrounds the hydraulic telescopic piece and is connected with the first surface of the connecting plate.
7. The method of using the deep loading test apparatus for open caisson construction period of claim 1, wherein the displacement limiting means comprises: the protection device comprises a protection cylinder, a bearing and a spring, wherein the protection cylinder is connected with a counter-force steel pipe in the counter-force device and extends out of the counter-force steel pipe, the spring is arranged in the protection cylinder, the first end of the spring is connected with the inner wall of the protection cylinder, the second end of the spring is connected with the bearing, and the bearing is tightly abutted to the inner wall of the open caisson test hole in a sliding mode.
8. The method of using the deep loading test apparatus for open caisson construction period of claim 7, wherein the displacement limiting device further comprises: the central column is arranged in the protective cylinder, a first end of the central column extends out of the protective cylinder, a second end of the central column is connected with the bearing, and the central column is sleeved with the spring.
9. The method for using the deep loading test equipment in the open caisson construction period of claim 1, wherein the displacement measuring device comprises: the displacement device comprises a displacement rod and a displacement observation instrument, wherein the displacement rod is arranged in a reaction steel pipe in the reaction device, a first end of the displacement rod is connected with a bearing plate in the loading device, a second end of the displacement rod extends out of the top of a reaction cross beam in the reaction device, and the displacement observation instrument is connected with the second end of the displacement rod.
10. The method of using the deep loading test equipment for open caisson construction period of claim 9, wherein the displacement measuring device further comprises: and the positioning ring is arranged on the inner side wall of the counterforce steel pipe and sleeved on the displacement rod.
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| CN2263664Y (en) * | 1996-11-05 | 1997-10-01 | 王文臣 | Deep flat loading test device |
| JP2006207151A (en) * | 2005-01-25 | 2006-08-10 | Ps Mitsubishi Construction Co Ltd | Ground load bearing capacity test method and its device |
| CN206245359U (en) * | 2016-12-02 | 2017-06-13 | 广东中科华大工程技术检测有限公司 | Foundation pile static loading test device |
| CN208459608U (en) * | 2018-05-24 | 2019-02-01 | 天津市石大同方新能源技术有限公司 | A kind of micro-earthquake monitoring system |
| CN212001318U (en) * | 2020-04-22 | 2020-11-24 | 武汉建科科技有限公司 | Digital pressure detection device suitable for pile foundation |
-
2021
- 2021-03-10 CN CN202110261872.3A patent/CN112878397A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2263664Y (en) * | 1996-11-05 | 1997-10-01 | 王文臣 | Deep flat loading test device |
| JP2006207151A (en) * | 2005-01-25 | 2006-08-10 | Ps Mitsubishi Construction Co Ltd | Ground load bearing capacity test method and its device |
| CN206245359U (en) * | 2016-12-02 | 2017-06-13 | 广东中科华大工程技术检测有限公司 | Foundation pile static loading test device |
| CN208459608U (en) * | 2018-05-24 | 2019-02-01 | 天津市石大同方新能源技术有限公司 | A kind of micro-earthquake monitoring system |
| CN212001318U (en) * | 2020-04-22 | 2020-11-24 | 武汉建科科技有限公司 | Digital pressure detection device suitable for pile foundation |
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