CN202330185U

CN202330185U - Rectangular rock board bend test loading device for monitoring lateral pressure variation

Info

Publication number: CN202330185U
Application number: CN2011202846717U
Authority: CN
Inventors: 王树仁; 保罗·黑跟; 张呈国
Original assignee: PAUL HAGEN
Current assignee: PAUL HAGEN
Priority date: 2011-08-08
Filing date: 2011-08-08
Publication date: 2012-07-11
Anticipated expiration: 2021-08-08

Abstract

The utility model provides a loading device which can carry out bend test on rectangular boards made of rock materials. The device is mainly formed by three parts: an upper part which is a round board capable of realizing centralized loading; a middle part which is a loading frame which is formed by connecting steel boards through bolts and can monitor the lateral pressure variation in real time; and a lower part which is a rectangular steel board base. With the aid of the loading device, the bend test of a single thick board, a single thin board and various combined forms of thick boards and thin boards can be realized under the condition of uniformly distributed load (equivalent to centralized point load). Meanwhile, rock board bending deformation and the variations of the lateral force during damage can be monitored.

Description

The charger that rectangle rock beam bending test monitoring wall pressure changes

Affiliated technical field

The utility model relates to a kind of bending test charger of plate, and especially rock type materials bending of Rectangular Plate test loading is carried out in rock mechanics field in mine.

Background technology

In the last few years, because the intervention in China a large amount of private and individual collieries, caused that the superficial part coal resources are predatory disorderly to be adopted, disorderly dig, formed a large amount of shallow-layers goaf hidden danger engineering that quantity and scope be difficult to add up (generally adopt deeply and adopt thickness rate) less than 30.Along with the minimizing day by day of land resource capable of using, many coal mine gobs are classified as industry and covil construction place gradually, and some highways, bridge, Tunnel Engineering etc. are built (structure) thing and had to cross over the superficial part goaf.

After the extraction of underground coal resource; The overlying strata body produces stresses re-distribution, causes the face of land to produce additional moving and distortion on the superficial part goaf; Cause face of land buildings or structures sedimentation, local cracking, tilt, until collapsing etc., have a strong impact on and endangering planning, construction and the safe operation of above goaf buildings or structures.

The superficial part goaf top plate depth of stratum that underlies is the vital safety guarantee of strip mining transformation.In above goaf perron digging process, operating personnel and open-air large-scale extractive equipment all possibly fall in the goaf at any time, cause casualties and property loss.Therefore, the safety of the goaf top plate of rationally confirming to underlie is isolated thickness, and is most important to the open pit bench excavation.On the one hand, excessive if its value is chosen, can cause the drilling hole amount increase that goaf disposal cost increase, productivity effect are reduced; On the other hand, too small if its value is chosen, then safety is isolated thickness low LCL, and operating personnel, extractive equipment are dangerous, might cause great casualties and equipment property loss, cause consequence such as mine stopping production.

Coal measures bedded deposit stratal configuration is the common rock mass structure type of coal mine gob top board.Because beded rock mass receives the influence of bedding architecture face, has tangible transverse isotropy, as consider the goaf top plate layer with layer between interaction, its deformation behaviour, failure mode, disrumpent feelings mechanism are more complicated.Therefore, carrying out superficial part goaf top plate deformation failure process and catastrophe Mechanism Study, is a challenging difficult problem anxious to be solved in the present engineering practice.At present, in rock mechanics experiment, usually the coal mine gob top board is reduced to beam both at home and abroad; Mainly carry out the three point bending test of beam; Actual engineering then shows as the destruction of plate, and is the failure mode of goaf stratiform compoboard, therefore; A kind of bending test charger that can carry out slab, thin plate and slab and thin plate array configuration of research and design is the key of carrying out goaf top plate deformation failure process and the experimental study of catastrophe mechanism.

Summary of the invention

In order to overcome 3 moment tests of present rock mechanics field rock beam hypothesis; Can not effectively disclose the deficiency of goaf top plate deformation behaviour, failure mode and disrumpent feelings mechanism; The utility model provides a kind of can monitor the rectangle rock beam bending test charger that wall pressure changes; Not only can carry out the multiple composite test of single slab, single thin plate and slab and thin plate; And can monitor the side force situation of change that produces in rock beam flexural deformation, the destructive process in real time, the disrumpent feelings mechanism of the damage that discloses all kinds of rock beams there are most important theories meaning and engineering practical value.

The utility model solves the technical scheme that its technical matters adopted: charger is mainly combined by three parts: top is for realizing concentrating the plectane (the evenly load equivalence is load) that loads; The middle part connects the loading frame that can monitor the side force variation in real time that steel plate is formed for bolt; The bottom is the rectangular steel plates base.

Process of the test:

The first step, the assembling charger, and charger is placed in mechanical pressure machine bottom such as MTS and loads on the cushion cap;

In second step,, be placed on the rotating cushion block in loading frame two ends the thick rock beam that processes, thin rock beam or its compoboard;

In the 3rd step, the nut of four bolts of adjusting makes loading frame both sides steel plate step up to test rock beam and bidirection press box;

The 4th step, on the test rock beam, place and load plectane, the steel ball that loads plectane is transferred to the position of form center of test rock beam;

The 5th step, utilize mechanical pressure machine such as MTS to loading the plectane load application, promptly can carry out under the centrostigma load action bending test research of all kinds of rectangle rock beams.

The beneficial effect of the utility model is by means of this charger, can realize under evenly load (equivalence the is the centrostigma load) condition the polymorphic bending test research of single slab, single thin plate and slab and thin plate.Under can the Considering Vertical load action, the side force situation of change that produces in rock beam flexural deformation, the destructive process.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

Fig. 1 is that the utility model structure is formed synoptic diagram.

Among Fig. 1: (1) superstructure; (2) central structure; (3) polycrystalline substance.

Fig. 2 is (1) superstructure detailed dimensions figure among Fig. 1.

Among Fig. 2: the 1-1 steel ball; The 1-2 round plate.

Fig. 3 is the 2-1 both sides steel plate figure of (2) central structure among Fig. 1.A-A is the steel plate sectional view.

Fig. 4 is the 2-2 intermediate thin steel plate figure of (2) central structure among Fig. 1.B-B is the sheet steel sectional view.

Fig. 5 is the pad support graph of (2) central structure among Fig. 1.C-C is the bearing sectional view.

Among Fig. 5: the movable base of 2-3; The 2-4 hold-down support; 2-5 rolling cylinder.

Fig. 6 is the circular screw flight figure of (2) central structure among Fig. 1.

Among Fig. 6: the circular screw rod of 2-6; The 2-7 screw thread.

Fig. 7 is (3) polycrystalline substance detailed dimensions figure among Fig. 1.

Among Fig. 7: 3-1 steel plate backing plate.

Fig. 8 is the design size figure of 4-1 rectangular thick plate.

Fig. 9 is the design size figure of 4-2 rectangular thin plate.

Embodiment

The first step, assembling charger Fig. 1 is placed in polycrystalline substance (3) mechanical pressure machine bottom such as MTS earlier and loads on the cushion cap, then, central structure (2) is placed on the polycrystalline substance (3), and Fig. 7 is the detailed dimensions figure of polycrystalline substance rectangular steel plates backing plate;

Second step; End or its array configuration with rectangle rock beam 4-1,4-2 among Fig. 8 and Fig. 9; Be placed among Fig. 5 on the rotating cushion block of 2-3,2-4 fixedly among base and Fig. 4 the welding of 2-2 intermediate thin steel plate fixing, among Fig. 5 among 2-3 and Fig. 5 2-4 be connected through rolling steel column in the groove;

In the 3rd step, the nut of 2-6 and four bolts of 2-7 makes loading frame both sides steel plate 2-1 and intermediate thin steel plate 2-2 step up to test rock beam and bidirection press box among adjusting Fig. 6;

The 4th step, on the test rock beam, place among Fig. 2 and load plectane, 1-2 loads the embedded movable steel ball 1-1 of round plate, the steel ball that loads plectane is transferred to the position of form center of test rock beam;

The 5th step, utilize mechanical pressure machine such as MTS to loading the plectane load application, can carry out under the centrostigma load action, the bending test of all kinds of rectangle rock beams, and can monitor the variation of side force in rock beam flexural deformation and the destructive process in real time.

Claims

1. one kind can be carried out the charger that rectangle rock beam bending test monitoring wall pressure changes, and this device is mainly combined by three parts: top is for realizing concentrating the plectane that loads; The loading frame that can monitor the side force variation is formed for bolt connects steel plate in the middle part; The bottom is the rectangular steel plates base; It is characterized in that: the thick rock beam that will process, thin rock beam or its compoboard; Be placed on the rotating cushion block in loading frame two ends,, make loading frame both sides steel plate step up to test rock beam and bidirection press box through regulating the nut of four bolts.

2. the charger that rectangle rock beam bending test monitoring wall pressure according to claim 1 changes; It is characterized in that: on the test rock beam, place and load plectane; After the steel ball that loads plectane being transferred to the position of form center of test rock beam, utilize MTS mechanical pressure machine, promptly can carry out under the centrostigma load action loading the plectane load application; The bending test of all kinds of rectangle rock beams, and can monitor the variation of wall pressure in real time.