Indoor destructive model test device for suspension bridge anchorage

Abstract

The utility model discloses an indoor destructive model test device for a suspension bridge anchorage, which comprises a base and a box body which are fixedly arranged on the ground, and the box body is rotationally connected to the base by taking one side edge of the bottom of the box body as a rotating shaft; two fixing frames are integrally or fixedly arranged above the base and located on the two sides of the box body respectively, a horizontal transverse rod is arranged at the top of each fixing frame, and a sliding groove is formed in each transverse rod. Screws are fixedly arranged on the two sides of the box body, penetrate through the sliding grooves and can slide in the sliding grooves, the screws are connected with nuts, and the nuts abut against the transverse rods so that the screws can be fixed to the fixing frame. According to the utility model, the screws are fixedly arranged on the two sides of the box body and can slide in the chutes, so that the box body can be turned over to a proper angle, the box body is fixed through the nuts, the anchorage model in the box body can be kept in an inclined state, a load is applied to the anchorage model at the moment, and the stress condition and displacement of the anchorage model are measured; therefore, the real stress state of the suspension bridge anchorage can be restored as much as possible.

Description

Technical Field

[0001] The utility model relates to the technical field of suspension bridge anchorage, in particular to an indoor destructive model test device for suspension bridge anchorage. Background Art

[0002] The anchor is the main load-bearing structure of the suspension bridge, and its load-bearing reliability is related to the safety of the entire bridge. Among them, the tunnel anchor is one of the important types of suspension bridge anchors, and its load-bearing mechanism, load-bearing capacity and failure mode are the focus of attention and research.

[0003] Indoor destructive model test is an important and most effective means to study the above problems. In actual engineering, the tunnel anchorage of suspension bridge has a certain inclination angle, and the anchorage system includes the front anchorage chamber, anchor plug body, rear anchorage chamber, and prestressed anchorage system. Its force transmission mechanism is that the main cable is bundled by the loose cable saddle and then docked with the prestressed anchorage system one by one, so that the main cable load is bundled and anchored on the rear anchorage surface of the anchor plug body. Therefore, it is necessary to set up the front anchorage chamber and anchor plug body during the experiment, and ensure that the main cable load is applied to the rear anchorage surface and is relatively evenly distributed. In addition, in actual engineering, the anchorages are arranged symmetrically along the central axis of the bridge, the distance between the two anchorages varies according to the width of the bridge deck, and the anchorage inclination angle also varies according to the inclination angle of the side span main cable and the geological conditions of the anchorage.

[0004] Therefore, in order to restore the stress state of the suspension bridge anchorage from loading to destruction under an inclined condition, the current common method is to make models with different inclination angles, then apply tension to the main cable, and measure the stress state of the suspension bridge anchorage. This method is simple and convenient, but the process of making models with different inclination angles is complicated, the production is difficult, and the cost is high. At the same time, a single model cannot be tested for different anchorage inclination angles. Therefore, how to set up a model test device so that the anchorage model test can restore the stress state of the suspension bridge anchorage as realistically as possible, and can be applicable to anchorage projects with different anchorage inclination angles and anchorage spacings, and facilitate the test is a problem that needs to be solved urgently in this field. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model aims to provide a suspension bridge anchorage indoor destructive model test device to solve the problem that the model test device in the prior art cannot be applied to anchorage projects with different anchorage inclination angles and anchorage spacings. The specific technical solution is as follows:

[0006] A suspension bridge anchorage indoor destructive model test device, characterized in that it comprises a base fixedly mounted on the ground and a box for filling the anchorage and rock mass model, wherein the box is rotatably connected to the base with one of the side edges of the bottom thereof as a rotation axis;

[0007] Above the base, two fixing brackets are integrally or fixedly arranged. The two fixing brackets are respectively located on both sides of the box body. A horizontally arranged cross bar is provided at the top of the fixing bracket, and a chute is opened vertically along the inner edge of the cross bar; Both sides of the box body are fixedly provided with screw rods. The screw rods pass through the chutes and can slide in the chutes. Nuts are threadedly connected to the screw rods, and the screw rods are fixed to the fixing brackets by abutting the nuts against the cross bars.

[0008] As a preferred embodiment: A gasket is also sleeved outside the screw rod, and the gasket is located between the cross bar and the nut.

[0009] As a preferred embodiment: A pull ring is arranged on the box body, and the pull ring is fixedly installed outside the side surface on the opposite side of the rotating shaft.

[0010] As a preferred embodiment: The diameter of the screw rod is 20 - 50 mm.

[0011] As a preferred embodiment: Threaded holes for installing support legs are provided at the top of the box body on the same side of the rotating shaft.

[0012] As a preferred embodiment: A wire winding wheel and a first pulley driven by a motor to rotate are installed on both of the two fixing brackets. A traction rope is fixedly wound around the wire winding wheel. The traction rope bypasses the first pulley and is fixedly connected to the box body, and the fixing position of the traction rope and the box body is at the top on the other side of the rotating shaft.

[0013] As a preferred embodiment: It further includes:

[0014] Bracket: It is arranged on one side close to the rotating shaft of the box body and is fixedly installed on the ground. A second pulley and a hollow jack are fixedly installed on the bracket, and the hollow jack is located above the second pulley;

[0015] Anchor plug body: It is arranged in the rock mass;

[0016] Steel strand: One end is fixed to the movable end of the hollow jack, bypasses the second pulley, is divided into several steel wires through a cable saddle and is anchored on the back anchor surface of the anchor plug body;

[0017] Earth pressure cell: It is fixedly arranged on both sides of the side wall of the anchor block and is used for monitoring the stress between the anchor block and the rock mass interface;

[0018] Dial gauge: It is arranged on the ground surface and in the rock mass and is used for measuring the displacement of the deep part and the apparent part of the rock mass.

[0019] As a preferred embodiment: it further includes a deep displacement measurement device arranged in the rock mass. The deep displacement measurement device includes a base plate, a fixing rod, a support and a sleeve. One end of the fixing rod is fixedly installed on the base plate, and the other end is provided with an external thread. A threaded hole is opened in the support, and the other end of the fixing rod is threadedly connected to the support. The sleeve is sleeved outside the fixing rod and can slide along the fixing rod;

[0020] The dial indicator is installed on the support.

[0021] As a preferred embodiment: the following are further provided on the bracket:

[0022] Channel steel: arranged vertically and fixed to both sides of the bracket respectively;

[0023] Mounting plate: arranged vertically, and multiple rows of horizontally opened positioning holes are opened therein for installing the second pulley;

[0024] Sliding plate: integrally or fixedly arranged on both sides of the mounting plate. The sliding plate is arranged vertically and perpendicular to the mounting plate, and the sliding plates on both sides are respectively slidably arranged in the two channel steels;

[0025] Positioning member: includes positioning screws respectively fixedly arranged at opposite positions on two side surfaces of the mounting plate and positioning nuts threadedly connected to the positioning screws. By rotating the two positioning nuts at corresponding positions, they respectively abut against the two side plates of the channel steel for fixing the mounting plate to the channel steels on both sides.

[0026] Compared with the prior art, the beneficial effects of the present utility model are:

[0027] By opening sliding grooves on the fixing frames on both sides of the base of the present utility model, and fixedly arranging screws on both sides of the box body, the screws can slide in the sliding grooves. Thus, by flipping the box body to a suitable angle and fixing the box body by the nuts on the screws abutting against the fixing frames, it can ensure that the anchor model in the box body remains in an inclined state. At this time, a load is applied to it, and its stress condition and displacement are measured, so as to restore as much as possible the true stress state of the suspension bridge anchor. Description of the Drawings

[0028] Figure 1 is the position relationship diagram of the box body and the base in the main view direction of the present utility model;

[0029] Figure 2 is the usage state diagram in the side view direction of the present utility model;

[0030] Figure 3 is the structural schematic diagram of the deep displacement measurement device in the present utility model;

[0031] Figure 4 is the structural schematic diagram of the mounting plate installed in the channel steel in the present utility model;

[0032] Figure 5 It is a schematic diagram of the connection relationship between the mounting plate and the two side edges of the channel steel in the present utility model.

[0033] In the figure, 1 is the base; 2 is the box body; 20 is the rotating shaft; 21 is the screw rod; 22 is the nut; 23 is the gasket; 24 is the pull ring; 25 is the support leg; 3 is the fixing frame; 4 is the wire winding wheel; 5 is the first pulley; 6 is the traction rope; 7 is the bracket; 8 is the second pulley; 9 is the hollow jack; 10 is the anchor plug body; 11 is the steel strand; 12 is the negative film; 13 is the fixing rod; 14 is the support; 15 is the collar; 16 is the channel steel; 161 is the side plate; 17 is the mounting plate; 170 is the positioning hole; 18 is the sliding plate; 191 is the positioning screw rod; 192 is the positioning nut. Specific embodiments

[0034] The following describes the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0035] The following illustrates the embodiments of the present disclosure through specific examples. Those skilled in the art can easily understand other advantages and effects of the present disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of them. The present disclosure can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0036] Embodiment 1

[0037] As Figure 1 and Figure 2 shown, a destructive model test device for a suspension bridge anchor chamber includes a base 1 and a box body 2 disposed on the base 1. A fixed support is provided inside the base 1. One of the bottom edges of the box body 2 is a rotating shaft 20 ( Figure 1The rotation axis is at the rear side of the box body 2 and is not shown in the figure. The rotation axis 20 is rotatably arranged in the fixed support, so that the box body 2 can be turned over on the base 1 around the rotation axis. The left and right sides of the box body 1 are fixed frames 3, and the fixed frames 3 are fixedly arranged on the base 1. A pull ring 4 is arranged on the front side of the box body 2. The pull ring 4 is preferably made of steel. Workers can drive the box body 2 to turn over by pulling the pull ring 4. A horizontal cross bar is arranged at the top of the fixed frame 3. A chute is opened in the cross bar along the vertical direction, and the length direction of the chute is arranged horizontally. Vertical screws 21 are fixedly arranged on the left and right sides of the box body 2 respectively. A gasket 23 is sleeved outside the screw 21, and a nut 22 is arranged above the gasket. The nut 22 is threadedly connected to the screw 21. When the box body 2 is turned over to a proper angle, the nut 22 can be tightened to make the gasket 23 abut against the upper part of the cross bar, so as to fix the box body 2. In addition, threaded holes are arranged at the top of the rear side of the box body 2, one group on the left and right respectively, for connecting the support legs 25. The other ends of the support legs 25 abut against the ground, so that the inclined state of the box body 2 can be maintained more stably.

[0038] As Figure 2 shown, in some other embodiments, a first pulley 5 and a wire winding wheel 4 can also be arranged on the fixed frame 3. The wire winding wheel 4 is driven by a motor, and the motor can be installed inside the fixed frame 3. The wire winding wheel rotates to pull the traction rope 6. The traction rope 6 bypasses the first pulley 5, and the other end is fixed to the upper part of the front side of the box body 2, so that the box body 2 can be pulled to turn over by the wire winding wheel 4, without manual pulling of the pull ring 24, which can reduce the work burden of the workers.

[0039] As Figure 2 shown, after the box body 2 is turned over to a proper inclined angle and fixed, since the box body 2 is filled with rock mass, an anchor plug body 10 is placed in the rock mass. A support 7 is arranged on one side of the box body 2. A hollow jack 9 is fixedly arranged on the support 7. The movable end of the hollow jack 9 fixes the steel strand 11 through a wedge-shaped plug body. The wedge-shaped plug body is frustum-shaped, divided into 2-3 petals, with a round hole in the center and a circular ring on the periphery to ensure the fastening of the wedge-shaped plug body. The outer diameter of the outer circular ring is slightly smaller than the inner diameter of the hollow jack.

[0040] A bearing is also fixedly installed on the support 7. A second pulley 8 is sleeved outside the bearing. The steel strand 11 passes through the second pulley 8, turns through a fixed pulley in the saddle chamber in the rock mass, and is then divided into bundles by a cable saddle, for simulating the main cable strands after being divided into bundles. The steel strand is also anchored on the rear anchor surface of the anchor plug body 10, so as to transfer the load of the steel strand 11 to the rear anchor surface of the anchor plug body 10, and complete the fixation of the steel strand 11. The steel strand 11 is pulled by the hollow jack 9 to apply a load to the anchor plug body 10, so as to analyze the stress state of the anchor plug body 10 and the stress and deformation response of the rock mass.

[0041] Combined with Figure 4As shown, on both sides of the support 7, vertically arranged channel steels 16 are fixedly installed. The channel steel includes two side plates 161. An installation plate 17 is arranged between the two channel steels 16. The installation plate 17 is preferably made of steel, and a number of columns of positioning holes 170 are opened thereon for installing the second pulley 8 through bolts. By installing the second pulley 8 on different columns of the installation plate 17, the left and right positions of the second pulley 8 can be adjusted to simulate the anchor projects with different spacings corresponding to different bridge deck widths.

[0042] Combined with Figure 5 As shown, sliding plates 18 are fixedly or integrally arranged on both sides of the installation plate 17. The sliding plates 18 are vertically arranged and perpendicular to the installation plate 17. The size of the sliding plates 18 matches that of the channel steels 16 and can slide up and down within the channel steels 16. By adjusting the positions of the sliding plates 18, it is convenient to adjust the height of the second pulley 8. One group or multiple groups of positioning devices are arranged on both side surfaces of the installation plate 17. Each group of positioning devices includes positioning screws 191 arranged at corresponding positions on the two side surfaces of the installation plate 17. External threads of the positioning screws 191 are threadedly connected with positioning nuts 192. By rotating the two positioning nuts 192 of each group, the positioning nuts 192 on both sides respectively abut against the two side plates 161 of the channel steels 16 to fix the installation plate 17.

[0043] The utility model further includes monitoring equipment, and the monitoring equipment includes stress monitoring equipment and displacement monitoring equipment. Among them, the stress monitoring equipment is an earth pressure cell, and the displacement monitoring equipment is a dial gauge. The earth pressure cells are fixedly installed on both sides of the side wall of the anchor, and specifically, they can be pasted with strong glue. The dial gauges are placed on the surface and deep positions of the stratum.

[0044] As Figure 3 shown, the dial gauges for measuring the deep positions are installed on the deep displacement measuring device. The deep displacement measuring device includes a bottom plate 12, a fixing rod 13, a support 14, and a sleeve 15. One end of the fixing rod 13 is fixedly installed on the bottom plate 12, and the other end is provided with external threads. A threaded hole is opened in the support 14, and the other end of the fixing rod 13 is threadedly connected with the support 14. The sleeve 15 is sleeved outside the fixing rod 13, and its length is less than that of the fixing rod 13, so it can slide along the fixing rod 13. The dial gauge is installed on the support 14. As a preference, the support 14 can be selected as a cuboid structure, which is beneficial to its placement in the rock mass. By arranging the sleeve 15, when the deep displacement measuring device has a displacement in the rock mass, since the sleeve 15 is sleeved outside the fixing rod 13, the sleeve 15 blocks the contact between the fixing rod 13 and the rock mass, reducing the influence of friction force. Thus, the dial gauge can more accurately measure the deep displacement of the rock mass caused by the load.

[0045] The utility model is provided with a fixing structure, which can conveniently fix the inclined box body 2 on the fixing frame 3. Therefore, when modeling, the anchor plug body model in the box body 2 does not need to be inclined. From beginning to end, the rear anchor surface is parallel to the bottom surface of the box body. After the construction of the anchor block and the rock mass model is completed, the box body is inclined through the pull ring to realize the modeling of the model with a given inclination angle, reducing the difficulty of simulating the anchor block project under the given inclination angle. Moreover, different anchor block spacings can be adjusted and different loads can be applied to the anchor plug body model, facilitating the experiment and being suitable for popularization and use.

[0046] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "middle", "length", "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0047] In the present utility model, unless otherwise clearly specified and limited, the first feature being "on" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. The meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0048] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] The above is only to illustrate the embodiments of the present utility model and is not used to limit the present utility model. For those skilled in the art, any modifications, equivalent replacements, improvements, etc. made without creative efforts within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A destructive model test device for a suspension bridge anchor chamber, characterized in that: It includes a base (1) fixedly installed on the ground and a box body (2) for filling the anchor and rock mass model. The box body (2) is rotatably connected to the base (1) with one side at its bottom as the rotation axis (20). Above the base (1), two fixing frames (3) are integrally or fixedly arranged. The two fixing frames (3) are respectively located on both sides of the box body (2). At the top of the fixing frame (3), there is a horizontally arranged cross bar, and a chute is opened along the vertical direction inside the cross bar. On both sides of the box body (2), screw rods (21) are fixedly arranged. The screw rods (21) pass through the chutes and can slide in the chutes. Nuts (22) are threadedly connected to the screw rods (21). By abutting the nuts (22) against the cross bar, the screw rods (21) are fixed to the fixing frames (3).

2. The destructive model test device for the suspension bridge anchor chamber according to claim 1, characterized in that: A gasket (23) is also sleeved outside the screw rod (21), and the gasket (23) is located between the cross bar and the nut (22).

3. The destructive model test device for the anchor chamber of a suspension bridge according to claim 1, characterized in that: A pull ring (24) is arranged on the box body (2), and the pull ring (24) is fixedly installed outside the side surface on the side opposite to the rotation axis (20).

4. The destructive model test device for the suspension bridge anchor chamber according to claim 1, wherein: The diameter of the screw rod (21) is 20 - 50 mm.

5. The destructive model test device for the anchor chamber of a suspension bridge according to claim 1, characterized in that: On the box body (2) at the top on the same side of the rotation axis (20), there are threaded holes for installing support legs (25).

6. The destructive model test device for the suspension bridge anchor chamber according to claim 1, wherein: On both of the two fixing frames (3), a wire winding wheel (4) driven by a motor to rotate and a first pulley (5) are installed. A traction rope (6) is fixedly wound around the wire winding wheel (4). The traction rope (6) bypasses the first pulley (5) and is fixedly connected to the box body (2), and the fixing position of the traction rope (6) and the box body (2) is at the top on the other side of the rotation axis (20).

7. The destructive model test device for the anchor chamber of a suspension bridge according to any one of claims 1-6, characterized in that It also includes: A bracket (7): arranged on one side close to the rotation axis (20) of the box body (2) and fixedly installed on the ground. A second pulley (8) and a hollow jack (9) are fixedly installed on the bracket (7). The hollow jack (9) is located above the second pulley (8). An anchor plug body (10): arranged in the rock mass; A steel strand (11): one end is fixed to the movable end of the hollow jack (9), bypasses the second pulley (8), is divided into several steel strands through a cable saddle and is anchored on the rear anchor surface of the anchor plug body (10); Earth pressure cells: fixedly arranged on both sides of the side wall of the anchor, used to monitor the stress between the anchor and the rock mass interface; Dial gauges: arranged on the ground surface and in the rock mass, used to measure the deep and apparent displacements of the rock mass.

8. The destructive model test device for the suspension bridge anchor chamber according to claim 7, wherein: It also includes a deep displacement measuring device arranged in the rock mass. The deep displacement measuring device includes a negative film (12), a fixing rod (13), a support (14) and a sleeve (15). One end of the fixing rod (13) is fixedly installed on the negative film (12), and the other end has an external thread. A threaded hole is opened in the support (14), and the other end of the fixing rod (13) is threadedly connected to the support (14). The sleeve (15) is sleeved outside the fixing rod (13) and can slide along the fixing rod (13). The dial gauge is installed on the support (14).

9. The destructive model test device for the suspension bridge anchor chamber according to claim 7, characterized in that, On the bracket (7), there is also arranged: Channel steels (16): arranged vertically and respectively fixed on both sides of the bracket (7); Mounting plate (17): Vertically arranged, with multiple columns of horizontally arranged positioning holes (170) formed therein for mounting the second pulley (8); Sliding plate (18): Integrally or fixedly arranged on both sides of the mounting plate (17), the sliding plate (18) is vertically arranged and perpendicular to the mounting plate (17), and the sliding plates (18) on both sides are respectively slidably arranged in two channel steels (16); Positioning member: Comprising a positioning screw (191) fixedly arranged at relative positions on two side surfaces of the mounting plate (17) respectively and a positioning nut (192) threadedly connected to the positioning screw (191), by rotating the two positioning nuts (192) at corresponding positions to respectively abut against the two side plates (161) of the channel steel (16), for fixing the mounting plate (17) on the two side channel steels (16).

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