CN106193133A - A kind of slope section bridge pile foundation three-dimensional stress model assay device - Google Patents

Abstract

The invention relates to the technical field of model test devices, in particular to a three-dimensional loading model test device for bridge pile foundations in slope sections. The model test device includes a box body, a horizontal load measuring device, a vertical load measuring device and a slope gradient measuring device; the horizontal load measuring device includes several vertical steel pipes, and a triangular bracket is installed on the upper end of the vertical steel pipes; The slope gradient measurement device includes a rotating screw, a rotating shaft, a slope template and an arc-shaped slideway, one end of the rotating screw passes through the arc-shaped slideway and is connected with the rotating shaft, and the other end of the rotating screw is provided There is a lock nut for positioning the moving position of the rotating screw; the rotating screw moves along the arc-shaped slideway, driving the rotating shaft to rotate, and the rotating shaft drives the slope forming template to rotate. The model test device has the advantages of simple structure, high slope forming efficiency, high test accuracy and efficiency, strong working reliability, good use effect, and convenient popularization and use.

Description

A three-dimensional loading model test device for bridge pile foundation in slope section

technical field

The invention relates to the technical field of model test devices, in particular to a three-dimensional loading model test device for bridge pile foundations in slope sections.

Background technique

Due to the complex hydrogeological conditions and geographical location of the bridge pile foundation in the slope section of the mountainous area, compared with the bridge pile foundation on the flat ground, its stress and deformation characteristics are more complicated, so it is necessary to study the slope bridge pile foundation. Conduct in-depth and systematic research on the bearing mechanism, force and deformation characteristics. Most of the existing theoretical studies simplify the complex three-dimensional problem of the pile foundation of the slope section bridge into a two-dimensional plane problem for analysis and research, so there is a big gap between the load-bearing conditions of the pile foundation of the slope section bridge in actual engineering , which will bring safety hazards to the design and construction of actual projects. Therefore, using indoor model tests to study the bearing and deformation of bridge pile foundations on slopes can reflect the three-dimensional interaction between slopes and pile foundations more realistically and reasonably.

The commonly used geotechnical model tests at home and abroad mainly include indoor conventional model tests and centrifugal model tests. Among them, the centrifugal model test can reproduce the stress field of the prototype with a smaller model, but the disadvantage is that the soil particle size effect and the test cost are relatively large. In addition, due to the small size of the model, the selection, layout and embedding of measuring instruments are difficult.

At present, the indoor conventional model test is a feasible and important research method to study the force, deformation and stability of the pile foundation of slope bridges. However, the existing conventional model test device can only apply horizontal load in a single direction, and the loading equipment is fixed, so there is a big difference compared with the bearing condition of the pile foundation in the actual project, and there are obvious limitations in the loading method. Moreover, the existing model test device does not have a corresponding slope forming mold when measuring the slope, and the slope angle cannot be adjusted arbitrarily, so the slope of the model slope cannot be effectively controlled, which brings inconvenience to the production of the model slope .

Contents of the invention

(1) Technical problems to be solved

The purpose of the present invention is to provide a three-dimensional loading model test device for bridge pile foundations in slope sections, which solves the problem that the existing test device has a single horizontal load loading mode and cannot effectively control the slope gradient of the model.

(2) Technical solution

In order to solve the above technical problems, the present invention provides a three-dimensional loading model test device for bridge pile foundations on slopes, including a box body, a horizontal load measuring device arranged on the box body, a vertical load measuring device and a side slope gradient measurement device. device;

Wherein said horizontal load measuring device comprises several vertical steel pipes, and the upper end of said vertical steel pipes is equipped with a triangular support capable of moving up and down and horizontally rotating along the inner holes of said vertical steel pipes;

The slope gradient measuring device includes a rotating screw, a rotating shaft connected to the rotating screw, several slope forming templates connected perpendicularly to the rotating shaft, and an arc-shaped slideway, wherein one end of the rotating screw passes through the The arc-shaped slideway is connected with the rotating shaft, and the other end of the rotating screw rod is provided with a lock nut for positioning the moving position of the rotating screw rod; the rotating screw rod moves along the arc-shaped slideway, driving the rotating shaft Rotate, the rotating shaft drives the slope forming formwork to rotate.

Further, the vertical load measuring device includes a reaction frame, a test pile arranged under the reaction frame and a jack, one end of the jack is connected to the reaction frame, and the other end of the jack is connected to the reaction frame. The above test piles are connected.

Specifically, a backing plate is provided between the jack and the test pile, and a first force sensor is also provided on the jack.

Further, the horizontal load measuring device also includes a pulley, a steel wire rope and a loading weight, wherein the pulley is installed on the tripod bracket, one end of the steel wire rope is connected with the test pile, and the other end of the steel wire rope passes through The pulley is connected with the loading weight, and a second force sensor is also arranged on the steel wire rope.

Specifically, the box body is a cuboid structure with an upper opening, and the box body is composed of a supporting steel frame and glass baffles arranged around the supporting steel frame.

Further, the vertical steel pipes include a first vertical steel pipe, a second vertical steel pipe and a third vertical steel pipe, wherein the first vertical steel pipe, the second vertical steel pipe and the third vertical steel pipe are respectively set on the three adjacent side walls of the box.

Specifically, the two ends of the vertical steel pipe are respectively connected to the supporting steel frame through a connection assembly, and the connection assembly includes a buckle and a connecting bolt, wherein the buckle is formed by a buckle and is arranged on the buckle The vertical steel pipe is arranged between the engaging part and the supporting steel frame, and the supporting steel frame and the connecting part are connected by the connecting bolts.

Specifically, the arc angle of the arc-shaped slideway is 90°, and the two ends of the arc-shaped slideway are respectively connected with the supporting steel frame.

Specifically, the supporting steel frame at the bottom of the box body is provided with a through hole adapted to the rotating shaft, and the two ends of the rotating shaft respectively pass through the through holes and protrude out of the supporting steel frame.

Specifically, the triangular bracket is positioned with the vertical steel pipe through a positioning piece, and the positioning piece is a positioning bolt.

(3) Beneficial effects

The technical scheme of the present invention has the following advantages:

The three-dimensional loading model test device for the bridge pile foundation of the slope section provided by the present invention drives the rotation shaft to rotate by adjusting the rotation screw to move along the arc-shaped slideway, and then drives the slope-forming formwork connected to the rotation shaft Rotate to form model slopes with different angles. During the test, the rotating screw can be adjusted according to the slope to be simulated to control the slope, thereby improving the accuracy and efficiency of the test; The triangular bracket at the upper end moves up and down in the inner hole of the vertical steel pipe to adapt to test piles of different heights, and adjusts the triangular bracket to rotate horizontally in the inner hole of the vertical steel pipe to adapt to horizontal forces in different directions . The invention has the advantages of simple and reasonable structure, various functions, high slope forming efficiency, high test accuracy and efficiency, strong working reliability, good use effect and convenient popularization and use.

Description of drawings

Fig. 1 is the structural schematic diagram of the three-dimensional loading model test device of the bridge pile foundation of the slope section of the embodiment of the present invention;

Fig. 2 is the enlarged schematic diagram of place A in Fig. 1 of the three-dimensional loading model test device for the bridge pile foundation in the slope section of the embodiment of the present invention;

Fig. 3 is a schematic diagram of side slope gradient control according to an embodiment of the present invention;

Fig. 4 is the enlarged schematic diagram of the B place in Fig. 1 of the three-dimensional loading model test device for the slope section bridge pile foundation of the embodiment of the present invention;

Fig. 5 is the enlarged schematic diagram of the C place in Fig. 1 of the three-dimensional loading model test device for the slope section bridge pile foundation of the embodiment of the present invention;

Fig. 6 is a schematic structural view of a further embodiment of the three-dimensional loading model test device for bridge pile foundations in slope sections according to the present invention.

In the figure: 1: supporting steel frame; 2: vertical steel pipe; 3: triangular bracket; 4: connecting component; 5: rotating screw; 6: rotating shaft; Lock nut; 10: reaction frame; 11: test pile; 12: jack; 13: pulley; 14: wire rope; 15: loading weight; 16: backing plate; 201: first vertical steel pipe; 202: second Vertical steel pipe; 203: third vertical steel pipe; 401: buckle; 402: connecting bolt.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figures 1-5, the three-dimensional loading model test device for bridge pile foundations in slope sections provided by the embodiment of the present invention includes a box body, a horizontal load measuring device arranged on the box body, a vertical load measuring device, and a side slope Slope measuring device.

The horizontal load measuring device includes several vertical steel pipes 2, and the upper end of the vertical steel pipes 2 is equipped with a tripod 3 capable of moving up and down and horizontally rotating along the inner holes of the vertical steel pipes 2. During use, adjust the triangular bracket 3 to move up and down in the inner hole of the vertical steel pipe 2 to adapt to test piles of different heights, and adjust the triangular bracket 3 in the inner hole of the vertical steel pipe 2. Rotate to adapt to the horizontal force in different directions, easy to operate, and improve the accuracy and efficiency of horizontal load measurement.

The slope gradient measuring device includes a rotating screw 5, a rotating shaft 6 connected to the rotating screw 5, several slope templates 7 vertically connected to the rotating shaft 6, and an arc-shaped slideway 8, wherein the rotating screw One end of 5 is connected to the rotating shaft 6 through the arc-shaped slideway 8, and the other end of the rotating screw 5 is provided with a lock nut 9 for positioning the moving position of the rotating screw. When in use, adjust the rotation screw rod 5 to move along the arc-shaped slideway 8, then the rotation screw rod 5 drives the rotation shaft 6 to rotate, and the rotation shaft 6 drives the slope template 7 to rotate, thereby realizing control The purpose of slope. In this embodiment, the arc angle of the arc-shaped slideway 8 is set to 90°, and a model slope of 0-90° can be formed by adjusting the position of the rotating screw 5, which greatly improves the accuracy of slope measurement and efficiency.

Further, the vertical load measuring device includes a reaction force frame 10, a test pile 11 arranged below the reaction force frame 10, and a jack 12, and one end of the jack 12 is connected with the reaction force frame 10, so that The other end of the jack 12 is connected to the test pile 11. A backing plate 16 is arranged between the jack 12 and the test pile 11 , and a first force sensor is also arranged on the jack 12 . When in use, the vertical load is controlled and applied by the jack 12, and the vertical load applied each time is measured by the first force sensor.

Further, the horizontal load measuring device also includes a pulley 13, a steel wire rope 14 and a loading weight 15, wherein the pulley 13 is installed on the tripod 3, and one end of the steel wire rope 14 is connected with the test pile 11 , the other end of the steel wire rope 14 passes through the pulley 13 and is connected to the loading weight 15 , and a second force sensor is also arranged on the steel wire rope 15 . In use, different pile foundation horizontal loads are applied by applying different loading weights, and the magnitude of the horizontal load applied each time is measured by the second force sensor.

Wherein, the pulley 13 is adjustable and movable installed on the tripod 3, and the pulley 13 can rotate 360° in the horizontal direction relative to the tripod 3. When it is necessary to measure the horizontal force in different directions, it can be adjusted The angle of the pulley 13 makes the direction of the pulley 13 consistent with the direction of the horizontal force to be measured, thereby ensuring the accuracy of measuring the horizontal force in different directions.

Specifically, the box body is a cuboid structure with an upper opening, and the box body is composed of a supporting steel frame 1 and glass baffles arranged around the supporting steel frame 1 . Wherein the supporting steel frame 1 is connected by splicing, through the transparent glass baffle, the changes of the body and the model piles in the box can be observed clearly and intuitively, the structure is simple, and it is very convenient to disassemble and install.

Specifically, the arc-shaped slideway 8 is composed of two arc-shaped plates arranged in parallel, and a slideway is formed between the two arc-shaped plates for limiting the sliding track of the rotating screw 5. The arc-shaped slideway The two ends of the track 8 are respectively connected with the supporting steel frame 1 by bolts.

Specifically, the upper and lower ends of the vertical steel pipe 2 are respectively connected to the supporting steel frame 1 through the connecting assembly 4, and the connecting assembly 4 includes a buckle 401 and a connecting bolt 402, wherein the buckle 401 is formed by a buckle Composed of joint parts and connecting parts arranged at both ends of the engaging part, the vertical steel pipe 2 is arranged between the engaging part and the supporting steel frame 1, and the supporting steel frame 1 and the connecting part They are connected by the connecting bolts 402 .

Specifically, the supporting steel frame at the bottom of the box body is provided with a through hole adapted to the rotating shaft 6, and the two ends of the rotating shaft 6 extend out of the supporting steel frame through the through hole respectively. Rack 1 exterior. A through hole compatible with the rotating screw 5 is provided on the rotating shaft 6, and one end of the rotating screw 5 passes through the through hole and is connected with the rotating shaft 6, when the rotating screw 5 moves , the rotating shaft 6 can be driven to rotate.

Specifically, the triangular bracket 3 is locked and positioned with the vertical steel pipe 2 by a positioning piece, and the positioning piece can be a positioning bolt. When the lifting position or rotation angle of the tripod 3 needs to be adjusted, the adjustment can be performed by loosening the positioning bolts; when the position is fixed, only the positioning bolts need to be locked, which is easy to operate.

Specifically, during the test, the height of the model slope can be controlled by adjusting the number of the slope forming formwork 7, and the slope forming formwork 7 is detachably installed on the rotating shaft 6, which is very convenient for loading and unloading , and after the slope-forming template 7 is completely disassembled, the model test device can be changed into a model test device for non-simulated slopes.

As shown in Figure 6, in a further embodiment of the present invention, the vertical steel pipes include a first vertical steel pipe 201, a second vertical steel pipe 202 and a third vertical steel pipe 203, wherein the first vertical The steel pipe 201, the second vertical steel pipe 202 and the third vertical steel pipe 203 are respectively arranged on the three adjacent side walls of the box, and the first vertical steel pipe 201, the second vertical steel pipe 202 and the The third vertical steel pipes 203 are respectively installed with a tripod to form a horizontal load measuring device in three different directions. When in use, experiments can be performed sequentially on the first vertical steel pipe 201 , the second vertical steel pipe 202 and the third vertical steel pipe 203 to further expand the direction and range of horizontal load measurement.

Of course, according to the direction of the horizontal load to be applied, a plurality of vertical steel pipes can be respectively arranged on each of the three side walls of the box, so that a horizontal load in any direction from 0° to 180° on the horizontal plane can be applied. Load, thus greatly improving the test accuracy and test efficiency.

In summary, the three-dimensional loading model test device for bridge pile foundations on slope sections provided by the embodiment of the present invention has the following advantages:

1. Through the horizontal load measuring device, vertical load measuring device and side slope measuring device arranged on the box body, the model test operation of force, deformation and stability under three-way bearing conditions is realized. The structure is simple and the design Novel and reasonable, with various functions.

2. The present invention controls the slope of the slope by adjusting the rotating screw. According to the slope slope to be simulated, a model slope of 0°-90° can be formed, which greatly improves the test accuracy and efficiency.

3. The present invention adapts to test piles of different heights by adjusting the upper and lower positions of the triangular bracket through the cooperation between the triangular bracket and the vertical steel pipe; and adapts to horizontal forces in different directions by adjusting the horizontal plane rotation angle of the triangular bracket.

4. The present invention also has the advantages of high measurement accuracy and efficiency, strong operational reliability, low cost, good use effect, long service life, and easy popularization and use.

In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "plurality" is two or more; the terms "upper", "lower", "left", "right", "inside ", "Outside" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific Orientation, construction and operation in a particular orientation, therefore should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. a slope section bridge pile foundation three-dimensional stress model assay device, it is characterised in that: include casing, be arranged on described case Horizontal load measurement apparatus, vertical load measurement apparatus and grade of side slope measurement apparatus in body；

Wherein said horizontal load measurement apparatus includes that some vertical steel pipes, the upper end of described vertical steel pipe are provided with can be along institute The endoporus stating vertical steel pipe moves up and down with level to the A-frame rotated；

Described grade of side slope measurement apparatus includes rotating rotary shaft and the described rotary shaft that screw rod is connected with described rotation screw rod Some one-tenth slope templates connected vertically and cambered way, one end of wherein said rotation screw rod passes described cambered way and institute Stating rotary shaft to be connected, the other end of described rotation screw rod is provided with the locking nut positioning described rotation screw motion position；Described Rotating screw rod to move along described cambered way, drive described rotary shaft to rotate, described rotary shaft drives described one-tenth slope template to rotate.

Slope section bridge pile foundation three-dimensional stress model assay device the most according to claim 1, it is characterised in that: described perpendicular Include reaction frame to load-measuring device, be arranged on the test pile below described reaction frame and jack, described jack One end is connected with described reaction frame, and the other end of described jack is connected with described test pile.

Slope section bridge pile foundation three-dimensional stress model assay device the most according to claim 2, it is characterised in that: described It is provided with backing plate between jack and described test pile, described jack is additionally provided with the first force transducer.

Slope section bridge pile foundation three-dimensional stress model assay device the most according to claim 2, it is characterised in that: described water Flat load-measuring device also includes pulley, steel wire rope and loading counterweight, and wherein said pulley is arranged on described A-frame, institute The one end stating steel wire rope is connected with described test pile, and the other end of described steel wire rope passes described pulley and described loading counterweight phase Even, described steel wire rope is additionally provided with the second force transducer.

Slope section bridge pile foundation three-dimensional stress model assay device the most according to claim 1, it is characterised in that: described case Body is the rectangular structure of upper opening, described casing by supporting steel frame and be arranged on described supporting steel frame surrounding glass gear Plate forms.

Slope section bridge pile foundation three-dimensional stress model assay device the most according to claim 5, it is characterised in that: described perpendicular The first vertical steel pipe, the second vertical steel pipe and the 3rd vertical steel pipe is included, wherein said the first vertical steel pipe, second to steel pipe Vertical steel pipe and the 3rd vertical steel pipe are separately positioned on three sidewalls of described casing.

Slope section bridge pile foundation three-dimensional stress model assay device the most according to claim 5, it is characterised in that: described perpendicular Being connected with described supporting steel frame by connection assembly respectively to the two ends of steel pipe, described connection assembly includes buckle and connects spiral shell Bolt, wherein said buckle is by holding section and is arranged on the connecting portion at two ends, described holding section and forms, and described vertical steel pipe is arranged Between described holding section and described supporting steel frame, by described connecting bolt phase between described supporting steel frame with described connecting portion Even.

Slope section bridge pile foundation three-dimensional stress model assay device the most according to claim 5, it is characterised in that: described arc The curved angle of shape slideway is 90 °, and the two ends of described cambered way are connected with described supporting steel frame respectively.

Slope section bridge pile foundation three-dimensional stress model assay device the most according to claim 5, it is characterised in that: described case Supporting steel frame bottom body is provided with the through hole suitable with described rotary shaft, and the two ends of described rotary shaft are each passed through described logical Hole is stretched out outside described supporting steel frame.

Slope section bridge pile foundation three-dimensional stress model assay device the most according to claim 1, it is characterised in that: described A-frame is positioned with described vertical steel pipe by keeper, and described keeper is bolt.