CN110146372B - Loading device and loading method for foundation pull-up load test - Google Patents
Loading device and loading method for foundation pull-up load test Download PDFInfo
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- CN110146372B CN110146372B CN201910372033.1A CN201910372033A CN110146372B CN 110146372 B CN110146372 B CN 110146372B CN 201910372033 A CN201910372033 A CN 201910372033A CN 110146372 B CN110146372 B CN 110146372B
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- 238000011068 loading method Methods 0.000 title claims abstract description 86
- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 230000005540 biological transmission Effects 0.000 claims abstract description 64
- 238000005452 bending Methods 0.000 claims abstract description 42
- 230000008030 elimination Effects 0.000 claims abstract description 32
- 238000003379 elimination reaction Methods 0.000 claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 3
- 238000012942 design verification Methods 0.000 description 2
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- 230000002238 attenuated effect Effects 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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Abstract
The invention discloses a loading device and a loading method for a basic pull-up load test, wherein the loading device comprises: the device comprises a loading screw (13), an upper top plate (7), a pressure-bearing force transmission device (A), a foundation screw (21), a bending elimination assembly (D) and a jack (5); part of the foundation screw rod (21) is poured into the experimental foundation (22); the pressure-bearing force transmission device (A) is placed on a foundation (23), the jack (5) is arranged on the pressure-bearing force transmission device (A), and the upper top plate (7) is arranged on the jack (5); the loading screw rod (13) sequentially passes through the upper top plate (7) and the pressure-bearing force transmission device (A) and is in flexible connection with the other part of the foundation screw rod (21) exposed to the experimental foundation (22) through the bending elimination assembly (D); the bending elimination assembly (D) is used for eliminating additional bending moment and stress concentration caused by rigid connection or non-coaxial connection of the loading screw (13) and the foundation screw (21).
Description
Technical Field
The invention relates to an upward pulling static load test device for a power transmission line tower model, in particular to a loading device and a loading method for an upward pulling load test of a single foundation bolt.
Background
The transmission tower foundation static load test is a universal direct and reliable method for carrying out tower foundation design verification and bearing characteristic research, wherein the capability and reliability of a lifting loading structure are key equipment for guaranteeing the reliability of test results. Because the transmission tower model foundation size is smaller, only 1 anchor screw is often pre-buried in the transmission tower model foundation. As shown in fig. 1, the loading structure types aiming at the up-pulling load test on the transmission tower model at present are various and do not realize standardization, but the main structural characteristics are that a penetrating jack is used as a power part, a force transmission beam, a loading screw and a foundation screw are used as main bearing members, and a nut-thread and a flange plate (disc) are used as main connection modes.
The conventional transmission tower foundation design verification and bearing characteristic research work can be completed by the conventional transmission tower model foundation static load test equipment, but the following problems exist: (1) problem that the loading process is limited by jack travel: when the foundation is deformed or the deformation of the force transmission beam is large or the foundation bearing characteristic under large deformation is needed to be studied in the loading process, under the condition that the foundation is not loaded to the required deformation, the jack reaches the maximum stroke, so that the test is forced to be stopped; (2) Due to assembly or loading errors between the loading screw and the foundation screw, additional bending moment is generated when an upward pulling load is applied to the test foundation, and on the other hand, the problem of stress concentration of a rigid connection mode is serious.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a loading device and a loading method for a single foundation bolt foundation pull-up load test, which are particularly suitable for the power transmission line tower single foundation bolt model foundation pull-up static load test. Aiming at the problems of jack restriction and additional bending moment and stress concentration caused by assembly errors in the process of a pull-up loading test, the main purpose of the invention is to realize that the pull-up load on a foundation is not attenuated in the range-increasing operation of the pull-up static load test by construction measures, thereby meeting the requirement of the pull-up static load test that the foundation is monotonically and increasingly pulled under the condition of large deformation (or insufficient rigidity of a foundation and a force transmission structure) of the foundation; the problems of additional bending moment and stress concentration caused by assembly or loading errors between the foundation screw and the loading screw are solved through the bending elimination connection measure.
The technical scheme provided by the invention is as follows: a loading device for a foundation pull-up load test, comprising: the device comprises a loading screw (13), an upper top plate (7), a pressure-bearing force transmission device (A), a foundation screw (21), a bending elimination assembly (D) and a jack (5);
Part of the foundation screw rod (21) is poured into the experimental foundation (22);
The pressure-bearing force transmission device (A) is placed on a foundation (23), the jack (5) is arranged on the pressure-bearing force transmission device (A), and the upper top plate (7) is arranged on the jack (5);
The loading screw rod (13) sequentially passes through the upper top plate (7) and the pressure-bearing force transmission device (A) and is in flexible connection with the other part of the foundation screw rod (21) exposed to the experimental foundation (22) through the bending elimination assembly (D);
The bending elimination assembly (D) is used for eliminating additional bending moment and stress concentration caused by rigid connection or non-coaxial connection of the loading screw (13) and the foundation screw (21).
Preferably, the bending elimination assembly (D) is of a universal joint structure.
Preferably, the bending elimination assembly (D) comprises:
an upper U-shaped card (15), a cross core (17) and a lower U-shaped card (19);
The U-shaped opening of the upper U-shaped card (15) is vertical to the U-shaped opening of the lower U-shaped card (19) along the central axis to form a universal joint;
The U-shaped opening of the upper U-shaped clamp (15) is clamped at one end of the cross core (17);
The U-shaped opening of the lower U-shaped clamp (19) is clamped at the other end of the cross core (17);
The U-shaped opening of the upper U-shaped card (15) is vertical to the U-shaped opening of the lower U-shaped card (19) along the central axis to form a universal joint;
The lower end of the loading screw rod (13) passes through the bottom end of the upper U-shaped card (15) and is fixedly connected with the bottom end of the upper U-shaped card (15);
The upper end of the lower anchor screw rod (21) penetrates through the bottom end of the lower U-shaped clamp (19) and is fixedly connected with the bottom end of the lower U-shaped clamp (19).
Preferably, the bending elimination assembly (D) further comprises: an upper U-shaped clamping pin (16) and a lower U-shaped clamping bolt (18);
the U-shaped opening of the upper U-shaped clamp (15) is clamped at one end of the cross core (17) through the pin bolt (16) for the upper U-shaped clamp;
the U-shaped opening of the lower U-shaped clamp (19) is clamped at the other end of the cross core (17) through the bolt (18) for the lower U-shaped clamp.
Preferably, the apparatus further comprises: two stroke-increasing members (C) symmetrically arranged along the perpendicular bisector of the jack (5), and a backing plate (6) placed on the jack for increasing the stroke of the test foundation (22).
Preferably, the range-extending member (C) includes: increase Cheng Luogan (11), increase journey screw upper nut (9), increase nut (10) in Cheng Luogan and increase Cheng Luogan lower nut (12);
The upper end of the increase Cheng Luogan (11) passes through the upper top plate (7);
the range-increasing screw upper nut (9) is screwed at the upper end of the range-increasing Cheng Luogan (11) in cooperation with the upward pulling movement stroke of the experimental foundation (22);
The nut (10) in the increase Cheng Luogan is fixed at the lower side of the upper top plate (7) and used for fastening and connecting the increase Cheng Luogan (11) and the upper top plate (7);
The nut (12) under the increment Cheng Luogan is matched with the upward pulling movement stroke of the experimental foundation (22) to be screwed at the lower end of the increment Cheng Luogan (11).
Preferably, the pressure-bearing force-transmitting device (a) comprises: the device comprises two bearing plates (1), two force transmission piers (2) and a force transmission beam group (3);
The bearing plate (1) is placed on a foundation (23), and the force transmission pier (2) is placed on the bearing plate (1);
The force transmission beam group (3) is arranged on the two force transmission piers (2).
Preferably, the device further comprises a lower top plate (4);
The lower top plate (4) is arranged between the jack (5) and the force transmission beam group (3), and the lower top plate (4) is used for transmitting the load of the jack (5) and the force transmission beam group (3) integrally;
and increase Cheng Luogan (11) and loading screw (13) pass lower roof (4), increase Cheng Luogan lower nut (12) screw to hug closely on lower roof (4).
Preferably, the force transmission beam group (3) consists of a plurality of force transmission beams.
Based on the same inventive concept, the invention also provides a loading method using the basic pull-up load test loading device, comprising the following steps:
flexibly connecting the loading screw (13) with an anchor bolt (21) poured in an experimental foundation (22) through the bending elimination assembly (D);
the jack (5) is lifted away from the pressure-bearing force transmission device (A) by driving the upper top plate (7) and the loading screw (13) to move upwards, so as to drive the bending elimination assembly (D) and the experimental foundation (22) fixedly connected with the bending elimination assembly (D) to move upwards.
Preferably, the driving of the loading screw (13) by the jack (5) moves upwards to drive the bending elimination assembly (D) and the experimental foundation (22) fixedly connected with the bending elimination assembly (D) move upwards, and the experimental foundation comprises:
1) The stroke of the jack (5) is fully increased, and the position of a nut (12) under the increment Cheng Luogan on the increment Cheng Luogan (11) in the increment component (C) is adjusted, so that the nut (12) under the increment Cheng Luogan is tightly attached to the lower top plate (4);
2) The jack (5) is retracted, the base plate (6) naturally falls along with the piston of the jack (5), and a gap is formed between the base plate (6) and the upper top plate (7);
3) The height of the base plate (6) is increased, and the gap between the base plate (6) and the upper top plate (7) is filled;
and then, if the basic pulling displacement needs to be continuously increased, repeating the steps 1) to 3).
Compared with the prior art, the invention has the beneficial effects that:
(1) The loading device provided by the invention comprises: the device comprises a loading screw (13), an upper top plate (7), a pressure-bearing force transmission device (A), a foundation screw (21), a bending elimination assembly (D) and a jack (5); part of the foundation screw rod (21) is poured into the experimental foundation (22); the pressure-bearing force transmission device (A) is placed on a foundation (23), the jack (5) is arranged on the pressure-bearing force transmission device (A), and the upper top plate (7) is arranged on the jack (5); the loading screw rod (13) sequentially passes through the upper top plate (7) and the pressure-bearing force transmission device (A) and is in flexible connection with the other part of the foundation screw rod (21) exposed to the experimental foundation (22) through the bending elimination assembly (D); the bending elimination assembly (D) is used for eliminating additional bending moment and stress concentration caused by rigid connection or non-coaxial connection of the loading screw (13) and the foundation screw (21), reducing errors and improving accuracy of the test.
(2) According to the technical scheme provided by the invention, the stroke increasing component (C) and the backing plate are additionally arranged, so that in the stroke increasing operation process of the loading structure, the stroke limiting problem of the jack is overcome, the foundation is always in a loading state, and the static load test requirement of monotonically increasing and pulling of the foundation is ensured as the stroke increasing component (C) is matched with the lifting movement stroke of the experimental foundation (20).
(3) According to the technical scheme provided by the invention, in the process of the range-increasing operation of the loading structure, the loading structure enables an operator to only need to carry out the screwing operation of the nut, so that the workload and time are saved;
(4) According to the technical scheme provided by the invention, the loading structure ensures that an operator only works outside the loading structure, so that potential safety hazards of entering the traditional loading structure by limbs of the operator are avoided.
Drawings
FIG. 1 is a schematic diagram of a loading device for a basic pull-up load test in the prior art;
FIG. 2 is a front view of a loading device for a basic pull-up load test of the present invention;
FIG. 3 is a side view in cross section of a loading device for the basic pull-up load test of the present invention;
FIG. 4 is a schematic diagram of a second structure of a loading device according to an embodiment of the present invention;
1-a pressure bearing plate; 2-a force transmission pier; 3-a force transmission beam group; 4-a lower top plate; 5-jack; 6-backing plate; 7-a top plate; 8-loading a nut on the screw; 9-increasing a nut on the screw; 10-adding Cheng Luogan a nut; 11-increase Cheng Luogan; 12-adding Cheng Luogan lower nuts; 13-loading screw; 14-loading a screw lower nut; 15-mounting a U-shaped card; 16-upper U-shaped bolt; 17-cross core; 18-lower U-shaped bolts for the clamp; 19-lower U-shaped card; 20-a nut for the anchor screw; 21-a ground screw; 22-test basis; 23-foundation.
Detailed Description
For a better understanding of the present invention, reference is made to the following description, drawings and examples.
Example 1
As shown in fig. 1, in the conventional loading device for the foundation pull-out load test, the loading screw and the anchor screw are rigidly connected, so that additional bending moment is generated while the pull-out load is applied to the test foundation, and on the other hand, the problem of stress concentration in the rigid connection mode is serious.
The implementation provides a loading device for a basic pull-up load experiment shown in fig. 2, which comprises:
1) The bearing plate 1 naturally falls on the surface of the foundation 23 and functions to transfer compressive load between the force transmission pier 2 and the foundation 23. Because the area of the bearing plate 1 is larger, the load of the foundation 23 is reduced, the foundation settlement is avoided, and the total resistance of the foundation is increased.
2) The force transmission pier 2 naturally falls on the bearing plate 1, and has the function of transmitting pressure load between the force transmission beam 3 and the bearing plate 1.
3) The force transmission beam group 3 naturally falls on the force transmission pier 2; the function of which is to transfer compressive loads between the lower top plate 4 and the force transferring pier 2.
4) The lower top plate 4 naturally falls on the force transmission beam group 3; the function of the hydraulic pressure transmission device is to transmit the pressure load between the center jack 5 and the force transmission beam 3.
5) The jack 5 naturally falls on the lower top plate 4; the oil supply and oil return working states of the jack pump station respectively control the extending and retracting actions of the piston of the jack 5.
6) The backing plate 6 naturally falls on the piston of the jack 5; the function of which is to transmit compressive loads between the jack piston and the nut 8 on the loading screw.
8) The nuts are connected with the screw rods through threads, such as 13-8, 13-14, 11-9, 11-10, 11-12 and 21-20; the loading screw 13 is used for transmitting a tensile load between the loading screw upper nut 8 and the loading screw lower nut 14; the anchor screw 21 is used for transmitting a tensile load between the anchor screw nut 20 and the test foundation 22; along with the jack 5, the loading screw 13 is driven to move upwards so as to drive the bending elimination assembly D and the experiment foundation 22 fixedly connected with the bending elimination assembly D to move upwards, and the upper top plate 7 and the upper top plate Cheng Luogan 11 are fixedly connected by an upper nut of the range-increasing screw and a middle nut of the range-increasing screw Cheng Luogan; the nut 12 under the increase Cheng Luogan is matched with the upward pulling movement stroke of the experiment foundation 22 to be screwed on the increase Cheng Luogan 11, and the nut 12 under the increase Cheng Luogan is positioned on the lower top plate 4.
9) The force transmission beam 3, the lower top plate 4 and the upper top plate 7 are reserved with holes or gaps, so that the loading screw 13 and the increase Cheng Luogan 11 pass through the holes or gaps.
10 The bending elimination assembly (the upper U-shaped clamp 15 to the lower U-shaped clamp 19) plays a role of a universal joint, namely, the additional bending moment caused by the fact that the loading screw 13 and the foundation screw 21 are not coaxial is eliminated, and only axial force is transmitted between the loading screw 13 and the foundation screw 21; the upper U-shaped clamp 15 is provided with a reserved hole, and the loading screw 13 passes through the reserved hole; the lower U-shaped clamp 19 is provided with a reserved hole, and the anchor screw rod 21 passes through the reserved hole;
the U-shaped openings of the upper U-shaped card 15 and the lower U-shaped card 19 are opposite and vertical.
11 The foundation screw 21 is pre-buried in the test foundation 22, and in the foundation pouring process, the foundation screw 21 is positioned and poured. The anchor screw nut 20 serves as a fixing function, ensuring that the anchor screw 21 is on the central axis.
12 As shown in fig. 4, the force transmission beam set 3 is composed of a plurality of force transmission beams, and the existence of the lower top plate 4 ensures the whole load transmission of the jack 5 and the force transmission beam set 3.
The novel program-increasing structure type of the up-pulling static load test provided by the invention ensures that the up-pulling static load test requirement of the foundation for monotonically increasing and pulling under the condition of large deformation (or insufficient rigidity of a foundation and a force transmission structure) of the foundation is met, and the additional bending moment and local stress concentration between a loading screw and a foundation screw are eliminated.
Example 2
Based on the same inventive concept, the invention also provides a loading method for the single foundation bolt foundation pull-up load test loading device, which comprises the following steps:
flexibly connecting the loading screw (13) with an anchor bolt (21) poured in an experimental foundation (22) through the bending elimination assembly (D);
the jack (5) is lifted away from the pressure-bearing force transmission device (A) by driving the upper top plate (7) and the loading screw (13) to move upwards, so as to drive the bending elimination assembly (D) and the experimental foundation (22) fixedly connected with the bending elimination assembly (D) to move upwards.
In an embodiment, the driving the loading screw (13) to move upwards by the jack (5) further drives the bending elimination assembly (D) and the experimental foundation (22) fixedly connected with the bending elimination assembly (D) to move upwards includes:
1) The stroke of the jack (5) is fully increased, and the position of a nut (12) under the increment Cheng Luogan on the increment Cheng Luogan (11) in the increment component (C) is adjusted, so that the nut (12) under the increment Cheng Luogan is tightly attached to the lower top plate (4);
2) The jack (5) is retracted, the base plate (6) naturally falls along with the piston of the jack (5), and a gap is formed between the base plate (6) and the upper top plate (7);
3) The height of the base plate (6) is increased, and the gap between the base plate (6) and the upper top plate (7) is filled;
and then, if the basic pulling displacement needs to be continuously increased, repeating the steps 1) to 3).
Example 3
1) Performing a pull-up loading test according to a standard flow, wherein the flow of the pull-up loading test is described in annex K/p.150-154 of DL/T5219-2014 of basic design technical regulations of overhead transmission lines; and closing the oil supply pump station of the jack when the jack stroke is full.
2) Screwing Cheng Luogan lower nut 12 downwards to make it contact with lower top plate 4;
3) Adjusting an oil supply pump station of the jack to an oil return working state, starting the oil supply pump station, and closing the pump station after the piston of the jack (5) is completely retracted; at this time, the gasket 6 naturally drops along with the piston of the jack 5, and a gap is formed between the gasket 6 and the cross arm 7;
4) Increasing the height of the spacer 6 to fill the gap formed in step 3);
5) Adjusting the oil supply pump station of the jack to an oil supply working state, and then continuing the loading test according to a standard flow;
6) And (5) repeating the steps 1) to 5) when the jack stroke is full again and if the foundation pulling displacement needs to be increased continuously.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the scope of the claims.
Claims (7)
1. The utility model provides a loading device of basic pull-up load test which characterized in that includes: the device comprises a loading screw (13), an upper top plate (7), a pressure-bearing force transmission device (A), a foundation screw (21), a bending elimination assembly (D) and a jack (5);
Part of the foundation screw rod (21) is poured into the experimental foundation (22);
The pressure-bearing force transmission device (A) is placed on a foundation (23), the jack (5) is arranged on the pressure-bearing force transmission device (A), and the upper top plate (7) is arranged on the jack (5);
The loading screw rod (13) sequentially passes through the upper top plate (7) and the pressure-bearing force transmission device (A) and is in flexible connection with the other part of the foundation screw rod (21) exposed to the experimental foundation (22) through the bending elimination assembly (D);
the bending elimination assembly (D) is of a universal joint structure and is used for eliminating additional bending moment and stress concentration caused by rigid connection or non-coaxial connection of the loading screw (13) and the foundation screw (21) so that only axial force is transmitted between the loading screw and the foundation screw;
the apparatus further comprises: two stroke-increasing members (C) symmetrically arranged along the perpendicular bisector of the jack (5), and a backing plate (6) placed on the jack for increasing the stroke of the test foundation (22);
The range-extending member (C) comprises: increase Cheng Luogan (11), increase journey screw upper nut (9), increase nut (10) in Cheng Luogan and increase Cheng Luogan lower nut (12);
The upper end of the increase Cheng Luogan (11) passes through the upper top plate (7);
the range-increasing screw upper nut (9) is screwed at the upper end of the range-increasing Cheng Luogan (11) in cooperation with the upward pulling movement stroke of the experimental foundation (22);
The nut (10) in the increase Cheng Luogan is fixed at the lower side of the upper top plate (7) and used for fastening and connecting the increase Cheng Luogan (11) and the upper top plate (7);
The nut (12) under the increment Cheng Luogan is matched with the upward pulling movement stroke of the experimental foundation (22) to be screwed at the lower end of the increment Cheng Luogan (11).
2. The device according to claim 1, wherein said de-bowing assembly (D) comprises:
An upper U-shaped card (15), a cross core (17) and a lower U-shaped card (19);
The U-shaped opening of the upper U-shaped card (15) is vertical to the U-shaped opening of the lower U-shaped card (19) along the central axis to form a universal joint;
the U-shaped opening of the upper U-shaped clamp (15) is clamped at one end of the cross core (17);
The U-shaped opening of the lower U-shaped clamp (19) is clamped at the other end of the cross core (17);
the U-shaped opening of the upper U-shaped card (15) is vertical to the U-shaped opening of the lower U-shaped card (19) along the central axis to form a universal joint;
The lower end of the loading screw rod (13) passes through the bottom end of the upper U-shaped card (15) and is fixedly connected with the bottom end of the upper U-shaped card (15);
The upper end of the lower anchor screw rod (21) penetrates through the bottom end of the lower U-shaped clamp (19) and is fixedly connected with the bottom end of the lower U-shaped clamp (19).
3. The apparatus of claim 2, wherein the de-bowing assembly (D) further comprises: an upper U-shaped clamping pin (16) and a lower U-shaped clamping bolt (18);
the U-shaped opening of the upper U-shaped clamp (15) is clamped at one end of the cross core (17) through the pin bolt (16) for the upper U-shaped clamp;
the U-shaped opening of the lower U-shaped clamp (19) is clamped at the other end of the cross core (17) through the bolt (18) for the lower U-shaped clamp.
4. The device according to claim 1, wherein the pressure-bearing force-transmitting means (a) comprises: the device comprises two bearing plates (1), two force transmission piers (2) and a force transmission beam group (3);
The bearing plate (1) is placed on a foundation (23), and the force transmission pier (2) is placed on the bearing plate (1);
the force transmission beam group (3) is arranged on the two force transmission piers (2).
5. The device according to claim 4, characterized in that it further comprises a lower top plate (4);
The lower top plate (4) is arranged between the jack (5) and the force transmission beam group (3), and the lower top plate (4) is used for transmitting the load of the jack (5) and the force transmission beam group (3) integrally;
and increase Cheng Luogan (11) and loading screw (13) pass lower roof (4), increase Cheng Luogan lower nut (12) screw to hug closely on lower roof (4).
6. The device according to claim 4, characterized in that the force-transmitting beam set (3) consists of a plurality of force-transmitting beams.
7. A loading method using the loading device for the pull-up load test according to any one of claims 1 to 6, comprising:
Flexibly connecting the loading screw (13) with an anchor bolt (21) poured in an experimental foundation (22) through the bending elimination assembly (D);
The jack (5) is lifted away from the pressure-bearing force transmission device (A) by driving the upper top plate (7) and the loading screw (13) to move upwards, so as to drive the bending elimination assembly (D) and the experimental foundation (22) fixedly connected with the bending elimination assembly (D) to move upwards;
the jack (5) lifts up from pressure-bearing force transmission device (A) through driving upper roof (7) and loading screw (13) upward movement, and then drives the curved subassembly (D) that disappears and with curved subassembly (D) fixed connection's experimental foundation (22) upward movement disappears, include:
1) The stroke of the jack (5) is fully increased, and the position of a nut (12) under the increment Cheng Luogan on the increment Cheng Luogan (11) in the increment component (C) is adjusted, so that the nut (12) under the increment Cheng Luogan is tightly attached to the lower top plate (4);
2) The jack (5) is retracted, the base plate (6) naturally falls along with the piston of the jack (5), and a gap is formed between the base plate (6) and the upper top plate (7);
3) The height of the base plate (6) is increased, and the gap between the base plate (6) and the upper top plate (7) is filled;
And then, if the basic pulling displacement needs to be continuously increased, repeating the steps 1) to 3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910372033.1A CN110146372B (en) | 2019-05-06 | 2019-05-06 | Loading device and loading method for foundation pull-up load test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910372033.1A CN110146372B (en) | 2019-05-06 | 2019-05-06 | Loading device and loading method for foundation pull-up load test |
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| CN110146372A CN110146372A (en) | 2019-08-20 |
| CN110146372B true CN110146372B (en) | 2024-05-24 |
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