CN108444783B - Model test soil filling device and method for slide type large underground test platform - Google Patents

Abstract

The invention discloses a model test filling device and method for a slide-type large-scale underground test platform, and belongs to the field of model test filling. The device includes a platform scale, a trolley, a rest platform, a slide device, a vertical steel plate, hinges, bolts, a vertical baffle, a model box, a vertical support rod, a steel plate slot and an anti-shock sleeve. Among them, the slide device consists of a funnel-shaped slide, a head slide, a middle slide, a tail slide and a replaceable curvature outlet. The main part of the funnel-shaped slide and the vertical steel plate are connected by movable hinges, and the vertical steel plate can rotate freely. The vertical baffle is supported on one side wall of the model box, and the vertical baffle plays the role of preventing the slide device from sliding down. The invention can be assembled quickly, and after the test filling is completed, the disassembly is simple, the filling speed is fast, and time and labor are saved. According to the actual spatial position relationship between the test platform and the top of the model box, linear slides or curved slides can be erected in sections, with great flexibility.

Description

A model test filling device and method for a slide-type large-scale underground test platform

technical field

The invention belongs to the field of model test filling, in particular to a model test filling device and method for a slide-type large-scale underground test platform.

Background technique

In recent years, with the improvement of above-ground structure research, more and more scientific research institutes have gradually shifted their research focus to the field of geotechnical engineering. The research methods of geotechnical engineering problems include theoretical research, model test and numerical simulation.

Model tests are widely used in geotechnical engineering fields such as tunnels and foundation pits. The reason is that model tests are relatively intuitive, and can qualitatively or quantitatively reflect the mechanical properties of natural rock mass related to underground engineering. Mutual influence can be mutually verified with mathematical models; physical simulation can simulate complex underground engineering structures and complex formation conditions more comprehensively and realistically. In addition, model tests can explore many problems that are not easy to solve by mathematical and mechanical methods at present, and provide a basis for establishing new theories and mathematical models. As the scale of underground engineering becomes larger and larger, the problems that arise become more and more complex, and more and more contents need to be studied. Therefore, the requirements for the level of scientific research and design of underground engineering are also getting higher and higher. Simulating the model test of underground engineering under complex geological conditions is the current research direction of geotechnical engineering and has practical engineering significance.

The disadvantage of model testing is that the size of the model device is much smaller than the size of the engineering structure and formation. Therefore, the model test cannot satisfy all similarity ratios, and there is a size effect. The current solution, one is to run a centrifuge test; the other is to increase the size of the model device. The larger the size of the model test, the closer the results are to actual engineering, and the smaller the size effect. In order to reduce the size effect as much as possible and simulate the stratigraphic conditions and structures in the actual project as accurately as possible, many scientific research institutions have adopted the method of increasing the size of the model box.

However, one of the most basic problems that model tests need to face is filling soil into the model box. For example, the underground comprehensive test platform of Beijing University of Technology can do a model test with a maximum size of 6m × 6m × 10m. How to quickly and safely fill such a large model box is a difficult problem.

In view of the large scale of the large-scale underground test platform, it is urgent to propose a device and method for filling soil for the large-scale underground test platform.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a test device with convenient operation and high soil filling efficiency, which is used for soil filling of a large underground test platform.

The technical problem to be solved by the present invention is to provide a device and method for filling soil for a large-scale underground test platform, which can be conveniently provided for the underground test platform. Reliable test platform filling scheme.

The technical solution of the present invention is:

A model test filling device for a slide-type large-scale underground test platform, the device comprises a platform scale (1), a trolley (2), a rest platform (3), a slide device, a vertical steel plate (12), a hinge (13) ), bolts (14), vertical baffles (15), model boxes (16), vertical support rods (17), steel plate grooves (18) and impact sleeves (19).

The platform scale (1) is used to weigh the mass of the test fill each time it is put into the trolley (2).

The trolley (2) is a walk-behind flatbed. The handle of the trolley (2) is provided with a vertical support. The vertical support can keep the trolley (2) balanced when placed on the ground. To the rest platform (3) of the test platform, and then repeatedly transport the soil for the test.

The rest platform (3) is a hollow steel box with no steel plate on the front. The bottom plate of the hollow steel box is anchored with the ground to form a whole, and is used for parking the trolley (2) and fixing the slide device, and the slide device is arranged in an oblique direction.

The slide device is composed of a funnel-shaped slide (4), a first slide (5), a middle slide (6), a tail slide (7) and a replaceable curvature outlet (8). The funnel-shaped slide (4), the first slide (5), the middle slide (6), the tail slide (7) and the replaceable curvature outlet (8) are connected in sequence; the funnel-shaped slide (4), the first slide (5), the middle slide The slide (6), the tail slide (7) and the head and tail of the replaceable curvature outlet (8) are all provided with extending ribs (9), which are connected to each other through the ribs (9).

The interior of the first slide (5), the middle slide (6) and the tail slide (7) are all composed of a support plate (10) and a circular steel ring (11), and the circular steel ring (11) is used for soil transportation, A support plate (10) is provided on the outer side of the circular steel ring (11), and the support plate (10) is used to prevent the circular steel ring (11) from moving and deforming. The slide device corresponds to the position of the model box (16).

The main part of the funnel-shaped slide (4) is connected with the vertical steel plate (12) by a movable hinge (13), and the vertical steel plate (12) can rotate freely. The vertical steel plate (12) is connected with the vertical panel of the rest platform (3) by bolts (14) to ensure that the funnel-shaped slide (4) and the rest platform (3) form a fixed whole.

A vertical baffle (15) is provided below the rear slide (7), the vertical baffle (15) is supported on one side wall of the model box (16), and the vertical baffle (15) prevents the slide device from sliding down effect.

The replaceable curvature outlet (8) plays the role of changing the direction of movement of the soil for testing in the slide. According to the position of the bottom of the box where the test soil needs to slide down, select the replaceable curvature outlet (8) with different lengths and different curvatures, and connect the replaceable curvature outlet (8) to the rear slide (7).

The bottom of the slide device is provided with a vertical support rod (17), the upper end of the vertical support rod (17) is connected with a steel plate groove (18), and the vertical support rod (17) plays the role of supporting the slide device, and the inclination of the slide device The angle is the same as the inclination angle of the steel plate slot (18).

The anti-impact sleeve (19) is made of tough and flexible material, and the anti-impact sleeve (19) is bound at the lowermost end of the replaceable curved surface outlet (8), and is vertically downward under the action of gravity. The impact velocity is reduced after passing through the anti-shock sleeve (19).

The inner surface of the circular steel ring (11) in the slide device is affixed with a smooth coil to reduce the friction between the test fill and the circular steel ring (11).

Utilize the above-mentioned sliding type large-scale underground test platform to carry out the soil filling method of the model test soil filling device, and this method comprises the following steps:

S1, according to the control density of the filling in the test model box (16), calculate the quality of the filling at the predicted height of each layer.

S2 In the test soil stacking area, use a platform scale (1) to weigh a certain amount of test soil in stages and put it into the trolley (2), and record the quality of the test soil in the trolley (2).

S3 pushes the trolley to the rest platform (3) of the test platform, pours the test soil into the funnel-shaped opening of the chute with a shovel or manual lift, and slides the test soil into the model box (16) through the chute.

S4 Push the trolley (2) back to the test soil stacking area, and load the weighed test soil into the trolley (2) again until the mass of the test soil in this layer reaches the calculated value.

S5 workers enter the model box through the escalator, flatten the soil for the test with a sand rake, and then compact it manually or mechanically according to the test plan.

S6 The test soil is compacted in layers, and the same position is rammed for a certain number of times, one compaction is pressed and half compacted, the compaction is connected, and the rows are connected. After the first tamping, re-leveling, and then tamping the next time.

S7 repeats steps S1-S6 to complete the filling and compaction of the next layer of test soil.

Compared with the prior art, the beneficial effects of the present invention are:

(1) The present invention uses a simple and low-cost test device and scheme, which can be quickly assembled and applied to a large-scale underground test platform model test filling device. At the same time, after the test fill is completed, the disassembly is simple.

(2) The present invention utilizes the gravitational potential energy of the filling soil, does not require the traditional heavy workload such as lifting and placing the soil for testing, the filling speed is fast, and time and effort are saved.

(3) The present invention focuses on providing an idea for filling soil for large underground test platforms. According to the actual spatial position relationship between the test platform and the top of the model box, linear slides or curved slides can be erected in sections, with great flexibility.

Description of drawings

Fig. 1 is a schematic diagram of a model test soil filling device of a slide-type large-scale underground test platform.

Figure 2 is a partial schematic diagram of the funnel-shaped slide and the head slide of the model test filling device of a slide-type large-scale underground test platform.

Fig. 3 is a partial schematic diagram of the head, middle and tail slides of a model test filling device of a slide-type large-scale underground test platform.

Figure 4 is a partial schematic diagram of the replaceable curvature outlet and the anti-shock sleeve of the model test soil filling device of a slide-type large-scale underground test platform.

Figure 5 is a top view of the slide device.

Figure 6 is a cross-sectional view of the first slide, the middle slide, and the tail slide of the slide device.

In the picture: 1. Platform scale, 2. Trolley, 3. Rest platform, 4. Funnel slide, 5. First slide, 6. Middle slide, 7. Tail slide, 8. Replaceable curvature outlet, 9. Rib , 10. Support plate, 11. Circular steel ring, 12. Vertical steel plate, 13. Hinge, 14. Bolt, 15. Vertical baffle, 16. Model box, 17. Vertical support rod, 18. Steel plate Slot, 19. Impact sleeve.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments, but the protection scope of the present invention should not be limited by this.

Referring first to Figures 1-6, the model test filling device of the slide-type large-scale underground test platform of the present invention is composed of a platform scale (1), a trolley (2), a rest platform (3) and a slide device, and the curvature can be replaced. Outlet (8), vertical support rod (17), anti-shock sleeve (19).

Platform scale (1), used to weigh the mass of the test fill each time it is put into the trolley. Small cart (2), during the test, push the test soil to the rest platform of the test platform, and then repeatedly transport the test soil. The rest platform (3) is a hollow steel box with no steel plate on the front, the bottom plate is anchored with the ground to form a whole, and is used for parking the trolley (2) and fixing the entire slide device at the lower part.

The slide device is the core part of the present invention, which consists of a funnel-shaped slide (4), a first slide (5), a middle slide (6), a tail slide (7) and a replaceable curvature outlet (8). The head and tail of each component are provided with outstretched rib plates (9), and each part is connected to each other by bolts between the rib plates (9). Among them, the first slide (5), the middle slide (6) and the tail slide (7) are all composed of a support plate (10) and a circular steel ring (11), and the circular steel ring (11) is used for soil During transportation, the support plate (10) is used to prevent the movement of the circular steel ring (11) from deformation. The main part of the funnel-shaped slide (4) is connected with the vertical steel plate (12) by a movable hinge (13), and the vertical steel plate (12) can rotate freely. The vertical steel plate (12) is connected with the vertical panel of the rest platform (3) by bolts (14) to ensure that the funnel-shaped slide (4) and the rest platform (3) form a fixed whole. The tail slide (7) has a vertical baffle plate (15) below it, which is supported on one side wall of the model box (16) and plays a role in preventing the slide device from sliding down. The replaceable curvature outlet (8) plays the role of converting the movement direction of the soil for testing in the slide. According to the position of the bottom of the box where the test soil needs to slide down, a replaceable curvature outlet (8) with different lengths and curvatures can be selected, and it can be connected with the rear slide (7).

The vertical support rod (17), the upper end of which is connected with a steel plate groove (18), plays the role of supporting the slideway, and the inclination angle of the slideway is the same as that of the steel plate groove (18). The anti-impact sleeve (19), a tough and flexible material, is bound at the lowermost end of the replaceable curved surface outlet (8), and is vertically downward under the action of gravity. After the test soil in the slide passes through the anti-impact sleeve (19), the velocity reduce.

The inner surface of the circular steel ring (11) in the above-mentioned slide device is affixed with a smooth coil to reduce the friction between the test fill and the steel ring.

The following operation steps are as follows with the model test material as the embodiment of sand:

S1, according to the control density of the fill in the model box (16), calculates the quality of the fill of the expected height of each layer. Next to the sand pile area, use the platform scale (1) to weigh the sand mass in stages, then load it into the trolley (2), and calculate and record the total mass of the test soil for the trolley.

S2 push the trolley to the rest platform (3) of the test platform, pour the test soil into the funnel-shaped opening of the slideway with a shovel or manual lift, and slide the test soil into the model box (16) through the slideway.

S3 Push the trolley (2) back to the test soil stacking area, and load the weighed test soil into the trolley (2) again until the mass of the test soil in this layer reaches the calculated value.

S4 workers entered the model box through the escalator, flattened the soil for the test with a sand rake, and then compacted it manually or mechanically according to the test plan. The test soil is compacted in layers, and the same position is rammed for a certain number of times. After the first tamping, re-leveling, and then tamping the next time.

S5 repeats steps (1)-(4) to complete the filling and compaction of the next layer of sand.

The components and embodiments of the present invention have been described above, but the present invention is not limited thereto, and can be appropriately changed within a range not departing from the gist of the present invention.

Claims (3)

1. The utility model provides a large-scale underground test platform's of slide formula model test device of filling soil which characterized in that: the device comprises a platform scale (1), a trolley (2), a rest platform (3), a slide device, a vertical steel plate (12), a hinge (13), a bolt (14), a vertical baffle (15), a model box (16), a vertical supporting rod (17), a steel plate groove (18) and an impact-proof sleeve (19):

the platform scale (1) is used for weighing the quality of the test filling soil which is put into the small cart (2) each time;

the small handcart (2) is a walking flat car, a vertical support is arranged at the handle of the small handcart (2), the vertical support is placed on the ground to keep the small handcart (2) balanced, soil for test is pushed onto a rest platform (3) of the test platform during test, and then the soil for test is transported repeatedly;

the rest platform (3) is a hollow steel plate box without a steel plate on the front surface, a bottom plate of the hollow steel plate box is anchored with the ground to form a whole and used for parking the trolley (2) and fixing the slide device, and the slide device is obliquely arranged;

the slide device consists of a funnel-shaped slide (4), a front slide (5), a middle slide (6), a tail slide (7) and a replaceable curvature outlet (8); the funnel-shaped slide (4), the head slide (5), the middle slide (6), the tail slide (7) and the replaceable curvature outlet (8) are sequentially connected; the end parts of the funnel-shaped slide (4), the head slide (5), the middle slide (6), the tail slide (7) and the replaceable curvature outlet (8) are all provided with outward extending rib plates (9) which are connected with each other through the rib plates (9);

the interior of each of the head slide (5), the middle slide (6) and the tail slide (7) is composed of a support plate (10) and a circular steel ring (11), the circular steel ring (11) is used for transporting soil, the support plate (10) is arranged on the outer side of the circular steel ring (11), and the support plate (10) is used for preventing the circular steel ring (11) from moving and deforming; the slide device corresponds to the position of the model box (16);

the main part of the funnel-shaped slide (4) is connected with a vertical steel plate (12) through a movable hinge (13), and the vertical steel plate (12) can rotate freely; the vertical steel plate (12) is connected with a vertical panel of the rest platform (3) through a bolt (14), so that the funnel-shaped slide (4) and the rest platform (3) form a fixed whole;

a vertical baffle (15) is arranged below the tail slide (7), the vertical baffle (15) is supported on the wall of one side of the model box (16), and the vertical baffle (15) plays a role in preventing the slide device from sliding downwards;

the replaceable curvature outlet (8) plays a role in converting the movement direction of the test soil in the slide; according to the position of the box bottom where the test soil is required to slide down, the replaceable curvature outlets (8) with different lengths and curvatures are selected, and the replaceable curvature outlets (8) are connected with the tail slide (7);

the bottom of the slide device is provided with a vertical support rod (17), the upper end of the vertical support rod (17) is connected with a steel plate groove (18), the vertical support rod (17) plays a role in supporting the slide device, and the inclination angle of the slide device is the same as that of the steel plate groove (18);

protecting against shock sleeve (19) are made by tough flexible material, and protecting against shock sleeve (19) ligature has reduced the impact velocity at the lower extreme of removable curved surface export (8), vertical downwards under the action of gravity, and the experiment in the slide device is with soil behind protecting against shock sleeve (19).

2. The model test soil filling device of the slide type large-scale underground test platform according to claim 1, characterized in that: smooth coiled materials are attached to the inner surface of a circular steel ring (11) in the slide device and used for reducing friction between test filling and the circular steel ring (11).

3. A soil filling method of a model test soil filling apparatus using the soil filling apparatus according to claim 1, characterized in that: the method comprises the following steps of,

s1, calculating the quality of the earth filling at the predicted height of each layer according to the control density of the earth filling in the test model box (16);

s2, weighing a certain amount of soil for the test in a soil piling area for the test by a platform scale (1) in a grading manner, then loading the soil for the test into the small trolley (2), and recording the total mass of the soil for the test of the small trolley (2);

s3, pushing the small cart to a rest platform (3) of the test platform, pouring test soil into a funnel-shaped opening of a slideway by using a spade or a manual lifting vehicle, and sliding the test soil into a model box (16) through the slideway;

s4, pushing the small cart (2) back to the test soil stacking area, and filling the weighed test soil into the small cart (2) again until the quality of the test soil on the layer reaches a calculated value;

s5, a worker enters the model box through the escalator, the soil for the test is scraped flat by a flat sand rake, and then manual tamping or mechanical tamping is selected according to the test scheme;

s6, ramming the soil for the test layer by layer, ramming the soil for a certain number of times at the same position, and performing ramming, namely half ramming, ramming connection and row connection; tamping for the first time, leveling again, and then tamping for the next time;

s7 repeating steps S1-S6 to complete filling and tamping of the soil for the next layer of test.

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