Equivalent applying device for simulating load of overlying soil mass of bridge bearing platform and mounting method
阅读说明：本技术 一种模拟桥梁承台上覆土体荷载的等效施加装置及安装方法 (Equivalent applying device for simulating load of overlying soil mass of bridge bearing platform and mounting method ) 是由 吴维洲 张玉芳 张国安 李健 郑昌明 范海明 肖霞林 李伟 李嘉明 王生涛 侯李 于 2021-06-22 设计创作，主要内容包括：本发明涉及工程试验等效模拟技术领域,尤其是涉及一种模拟桥梁承台上覆土体荷载的等效施加装置及安装方法。该模拟桥梁承台上覆土体荷载的等效施加装置,其包括：若干个千斤顶装置、若干个机械传动框架机构以及第一钢板、第二钢板、第三钢板；该装置基于杠杆原理利用千斤顶顶推力通过机械装置传递达到对上覆荷载的等效操作,是一种适用于实体工程试验或室内模型试验的上覆荷载等效装置。解决了上覆荷载因结构监测无法掩埋及因体积和重量限制在工程试验中难以实现等效的难题。该装置采用液压千斤顶为动力源,可通过控制调整千斤顶数量、装置中主体材料的型号规格及螺杆的锚固深度来应对不同的工况。(The invention relates to the technical field of engineering test equivalent simulation, in particular to an equivalent applying device and an installation method for simulating the load of an overlying soil body of a bridge bearing platform. This device is applyed to equivalent of simulation bridge cushion cap overlying soil body load, it includes: the lifting jack device comprises a plurality of lifting jack devices, a plurality of mechanical transmission frame mechanisms, a first steel plate, a second steel plate and a third steel plate; the device utilizes jack thrust to reach the equivalent operation to overlying load through mechanical device transmission based on lever principle, is one kind and is applicable to entity engineering test or indoor model test's overlying load equivalent device. The problems that the overlying load cannot be buried due to structure monitoring and equivalence is difficult to realize in engineering tests due to volume and weight limitation are solved. The device adopts hydraulic jack as the power supply, and accessible control adjustment jack quantity, the model specification of main part material and the anchor degree of depth of screw rod in the device deal with different operating modes.)
1. The utility model provides a device is applyed to equivalent of simulation bridge cushion cap overlying soil body load which characterized in that includes:
the first steel plate is lapped on the upper end surfaces of the two concrete structures;
a second steel plate disposed on an upper end surface of the first concrete structure;
the third steel plate is arranged on the upper end face of the first concrete structure, a plurality of screw rods are implanted into the first concrete structure, and the third steel plate is fixed at the end parts of the screw rods;
a plurality of mechanical drive frame mechanisms, wherein each mechanical drive frame mechanism includes: the first I-shaped steel is positioned above the first steel plate, the second steel plate and the third steel plate, the second I-shaped steel, the third I-shaped steel and the fourth I-shaped steel are positioned below the first I-shaped steel and are respectively and vertically arranged with the first I-shaped steel, the bottom end of the second I-shaped steel is arranged on the second steel plate, a gap is reserved between the second I-shaped steel and the first I-shaped steel, the bottom end of the third I-shaped steel is arranged on the third steel plate through a hinge seat, the top end of the third I-shaped steel is connected with the first I-shaped steel, the bottom end of the fourth I-shaped steel is arranged on the first steel plate, and the top end of the fourth I-shaped steel is connected with the first I-shaped steel;
and each jack device is correspondingly arranged in a gap between the second I-shaped steel and the first I-shaped steel of one mechanical transmission frame mechanism.
2. The apparatus of claim 1, wherein the articulated seat comprises: the base vertical plate, the rotating steel plate and the pin shaft are arranged on the base vertical plate;
the two base vertical plates are welded on the third steel plate;
the base vertical plate is provided with a shaft hole;
the rotating steel plate is provided with a shaft hole, the rotating steel plate is arranged at the bottom end of the third I-shaped steel, and the rotating steel plate is inserted between the two base vertical plates;
the pin shaft penetrates through the two base vertical plates and the shaft holes of the rotating steel plates.
3. The equivalent applying device for the overburden soil load of the simulated bridge bearing platform of claim 2, wherein the third steel plate is provided with a mounting hole, and the mounting hole of the third steel plate is arranged on a screw rod implanted in a concrete structure in a penetrating manner and is fixed through a nut.
4. The equivalent applying device for the overburden soil load of the simulated bridge bearing platform of claim 1, wherein the second steel plate and the third steel plate are respectively strip-shaped steel plates, and the width of the first steel plate is larger than the width of the second steel plate and the width of the third steel plate.
5. The apparatus of claim 1, wherein the jack device is a hydraulic drive structure.
6. The equivalent load device for simulating an overlying soil mass load of a bridge bearing platform of claim 5, wherein a plurality of the jack devices are supplied with oil by a series line.
7. The equivalent of exerting device of simulating overlying soil body load of bridge cushion cap of claim 1, characterized in that, angle steel bearing structure is connected between first I-steel and the third I-steel.
8. The equivalent of exerting device of simulating overlying soil body load of bridge cushion cap of claim 1, characterized in that, be connected with angle steel bearing structure between first I-steel and the fourth I-steel.
9. A method for installing an equivalent applying device for simulating an overlying soil load of a bridge bearing platform according to any one of claims 1 to 8, comprising the following steps:
s1, preprocessing a component:
processing various required steel components according to the requirements of design drawings, which comprises the following steps: the steel plate comprises a first steel plate, a second steel plate, a third steel plate, a first I-shaped steel, a second I-shaped steel, a third I-shaped steel, a fourth I-shaped steel and a hinge seat, wherein when each steel component is machined, the component is cut into a preset specific shape, and holes are pre-punched at a preset specific position;
s2, welding:
welding the main body component according to a design drawing, wherein the welding comprises welding of a first I-shaped steel, a second I-shaped steel, a third I-shaped steel, a fourth I-shaped steel and a hinge seat, and the welding process requires that the defects of slag inclusion, cracks, air holes and undercut are not generated;
s3, drilling:
considering the installation of the steel plate members at the later stage, drilling holes in the concrete structure are strictly constructed according to the design interval, the maximum allowable deviation is +/-2 mm, the hole inclination is not more than 2 degrees every 10mm, and residues in the holes are cleaned by a blower after the holes are formed;
s4, implanting a reinforcing screw:
adopting automatic injection of bar-planting glue, extruding a small amount of glue mixed unevenly in the front by using a glue gun, then injecting glue into a hole, ensuring the sequence from the bottom of the hole to an orifice, injecting the glue to fill more than 2/3 of the depth of the hole, screwing a screw into the drilled hole, drawing the screw up and down for several times, adhering the glue to the screw in the maximum range, waiting for 24 hours, and not shaking the screw in the period;
s5, integral assembly:
fixing a third steel plate on a screw rod implanted in a concrete structure by using a nut to form a base of the whole device, welding two base vertical plates on the third steel plate, installing a jack device at a corresponding position according to design through a pin shaft, the two base vertical plates and a shaft hole of a rotating steel plate, and welding a plurality of groups of mechanical transmission frame mechanisms into a whole by using a second steel plate and a steel bar;
s6, pushing by a jack device:
the jack devices adopt hydraulic transmission and are supplied with oil through series circuits so as to ensure that the output of each jack device is consistent, the load output by the jack devices is equal to the load of the fourth I-shaped steel on the other end to the first steel plate, and the force is uniformly diffused through the first steel plate so as to achieve the purpose of equivalently covering the load.
Technical Field
The invention relates to the technical field of engineering test equivalent simulation, in particular to an equivalent applying device and an installation method for simulating the load of an overlying soil body of a bridge bearing platform.
Background
At present, with the development of railway construction in China, various large-scale complex geological disasters can not be avoided, and research means for renovating and treating the disasters comprise theoretical analysis, numerical calculation, indoor model tests, field entity tests and the like, wherein the inevitable existing parts of the indoor model tests and the field entity tests cannot be covered with loads consistent with a prototype, and the inevitable reasons comprise that monitoring on a structure cannot be buried, the implementation difficulty is high, the manufacturing cost is high and the like.
The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide an equivalent applying device for simulating the load of an overlying soil body of a bridge bearing platform and an installation method, and aims to solve the technical problems in the prior art.
In a first aspect, the present invention provides an equivalent applying device for simulating a load of an overlying soil mass of a bridge bearing platform, comprising:
the first steel plate is lapped on the upper end surfaces of the two concrete structures;
a second steel plate disposed on an upper end surface of the first concrete structure;
the third steel plate is arranged on the upper end face of the first concrete structure, a plurality of screw rods are implanted into the first concrete structure, and the third steel plate is fixed at the end parts of the screw rods;
a plurality of mechanical drive frame mechanisms, wherein each mechanical drive frame mechanism includes: the first I-shaped steel is positioned above the first steel plate, the second steel plate and the third steel plate, the second I-shaped steel, the third I-shaped steel and the fourth I-shaped steel are positioned below the first I-shaped steel and are respectively and vertically arranged with the first I-shaped steel, the bottom end of the second I-shaped steel is arranged on the second steel plate, a gap is reserved between the second I-shaped steel and the first I-shaped steel, the bottom end of the third I-shaped steel is arranged on the third steel plate through a hinge seat, the top end of the third I-shaped steel is connected with the first I-shaped steel, the bottom end of the fourth I-shaped steel is arranged on the first steel plate, and the top end of the fourth I-shaped steel is connected with the first I-shaped steel;
and each jack device is correspondingly arranged in a gap between the second I-shaped steel and the first I-shaped steel of one mechanical transmission frame mechanism.
As a further technical solution, the hinge base includes: the base vertical plate, the rotating steel plate and the pin shaft are arranged on the base vertical plate;
the two base vertical plates are welded on the third steel plate;
the base vertical plate is provided with a shaft hole;
the rotating steel plate is provided with a shaft hole, the rotating steel plate is arranged at the bottom end of the third I-shaped steel, and the rotating steel plate is inserted between the two base vertical plates;
the pin shaft penetrates through the two base vertical plates and the shaft holes of the rotating steel plates.
As a further technical scheme, the third steel plate is provided with a mounting hole, and the mounting hole of the third steel plate is mounted on a screw rod implanted in a concrete structure in a penetrating manner and is fixed through a nut.
As a further technical solution, the second steel plate and the third steel plate are respectively strip-shaped steel plates, and the width of the first steel plate is greater than the width of the second steel plate and the width of the third steel plate.
As a further technical scheme, the jack device is of a hydraulic transmission structure.
As a further technical scheme, a plurality of jack devices adopt serial lines for oil supply.
As a further technical scheme, an angle steel supporting structure is connected between the first I-shaped steel and the third I-shaped steel.
As a further technical scheme, an angle steel supporting structure is connected between the first I-shaped steel and the fourth I-shaped steel.
In a second aspect, the invention further provides an installation method of the equivalent applying device for simulating the load of the overlying soil mass of the bridge bearing platform, which comprises the following steps:
s1, preprocessing a component:
processing various required steel components according to the requirements of design drawings, which comprises the following steps: the steel plate comprises a first steel plate, a second steel plate, a third steel plate, a first I-shaped steel, a second I-shaped steel, a third I-shaped steel, a fourth I-shaped steel and a hinge seat, wherein when each steel component is machined, the component is cut into a preset specific shape, and holes are pre-punched at a preset specific position;
s2, welding:
welding the main body component according to a design drawing, wherein the welding comprises welding of a first I-shaped steel, a second I-shaped steel, a third I-shaped steel, a fourth I-shaped steel and a hinge seat, and the welding process requires that the defects of slag inclusion, cracks, air holes and undercut are not generated;
s3, drilling:
considering the installation of the steel plate members at the later stage, drilling holes in the concrete structure are strictly constructed according to the design interval, the maximum allowable deviation is +/-2 mm, the hole inclination is not more than 2 degrees every 10mm, and residues in the holes are cleaned by a blower after the holes are formed;
s4, implanting a reinforcing screw:
adopting automatic injection of bar-planting glue, extruding a small amount of glue mixed unevenly in the front by using a glue gun, then injecting glue into a hole, ensuring the sequence from the bottom of the hole to an orifice, injecting the glue to fill more than 2/3 of the depth of the hole, screwing a screw into the drilled hole, drawing the screw up and down for several times, adhering the glue to the screw in the maximum range, waiting for 24 hours, and not shaking the screw in the period;
s5, integral assembly:
fixing a third steel plate on a screw rod implanted in a concrete structure by using a nut to form a base of the whole device, welding two base vertical plates on the third steel plate, installing a jack device at a corresponding position according to design through a pin shaft, the two base vertical plates and a shaft hole of a rotating steel plate, and welding a plurality of groups of mechanical transmission frame mechanisms into a whole by using a second steel plate and a steel bar;
s6, pushing by a jack device:
the jack devices adopt hydraulic transmission and are supplied with oil through series circuits so as to ensure that the output of each jack device is consistent, the load output by the jack devices is equal to the load of the fourth I-shaped steel on the other end to the first steel plate, and the force is uniformly diffused through the first steel plate so as to achieve the purpose of equivalently covering the load.
By adopting the technical scheme, the invention has the following beneficial effects:
the invention achieves equivalent operation of the overburden load by utilizing the pushing force of the jack and transmitting the pushing force through a mechanical device based on the lever principle, and is the overburden load equivalent device suitable for a solid engineering test or an indoor model test. The problems that the overlying load cannot be buried due to structure monitoring and equivalence is difficult to realize in engineering tests due to volume and weight limitation are solved. The device adopts hydraulic jack as the power supply, and accessible control adjustment jack quantity, the model specification of main part material and the anchor degree of depth of screw rod in the device deal with different operating modes. The device has the advantages of simple and stable structure, economy, reasonableness and convenience in construction, the stress structure and the counter-force structure are on the same side, the practicability is strong, and a simple and feasible method and thought are provided for the aspect of equivalent simulation of a single load engineering test.
The invention has the advantages of simple structure, common materials, economy, reasonableness, convenient and reliable installation, the same side of the stress structure and the counter-force structure and the like, and can realize equivalent simulation of overlying load.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic plan view of an equivalent applying device for simulating a load of an overlying soil mass of a bridge bearing platform according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an equivalent applying device for simulating a load of an overlying soil mass of a bridge bearing platform according to an embodiment of the present invention;
FIG. 3 is an enlarged view of part A shown in FIG. 1;
fig. 4 is a schematic structural diagram of a hinge base according to an embodiment of the present invention;
FIG. 5 is a side view of a hinge base provided by an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a rotating steel plate according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a pin according to an embodiment of the present invention;
fig. 8 is a plan view of a comprehensive testing system provided in an embodiment of the present invention.
Icon: 1-a jack device; 2-second i-steel; 3-reinforcing steel bars; 4-a second steel plate; 5-a first i-beam; 6-third I-steel; 7-a pin shaft; 8-angle steel support structure; 9-a base vertical plate; 10-a third steel plate; 11-a screw; 12-fourth I-steel; 13-a first steel plate; 14-rotating the steel plate; 101-drilling a pile; 102-bridge bearing platform; 103-slide-resistant piles; 104-concrete walls; 105-a jack; 106-load wall.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Example one
Referring to fig. 1 to 7, in one embodiment, an equivalent applying device for simulating a load of an overlying soil mass of a bridge bearing platform is provided, which includes: the steel plate lifting device comprises a first steel plate 13, a second steel plate 4, a third steel plate 10, a plurality of mechanical transmission frame mechanisms and a plurality of jack devices 1; the first steel plate 13 is lapped on the upper end surfaces of the two concrete structures (the two concrete structures are arranged at intervals); the second steel plate 4 is arranged on the upper end face of the first concrete structure; the third steel plate 10 is arranged on the upper end surface of a first concrete structure, a plurality of screw rods 11 are embedded into the first concrete structure, and the third steel plate 10 is fixed at the end parts of the screw rods 11; wherein, every mechanical transmission frame mechanism includes: a first I-beam 5, a second I-beam 2, a third I-beam 6 and a fourth I-beam 12, wherein the first I-beam 5 is positioned above the first steel plate 13, the second steel plate 4 and the third steel plate 10, the second I-beam 2, the third I-beam 6 and the fourth I-beam 12 are positioned below the first I-beam 5, and are respectively arranged vertically to the first i-beams 5, the bottom ends of the second i-beams 2 are arranged on the second steel plates 4, a gap is reserved between the second I-shaped steel 2 and the first I-shaped steel 5, the bottom of the third I-shaped steel 6 is arranged on the third steel plate 10 through a hinge seat, the top end of the third I-beam 6 is connected with the first I-beam 5, the bottom end of the fourth I-beam 12 is arranged on the first steel plate 13, and the top end of the fourth I-beam 12 is connected with the first I-beam 5; each jack device 1 is correspondingly arranged in a gap between the second I-beam 2 and the first I-beam 5 of one mechanical transmission frame mechanism, the load output by the jack device 1 is equal to the load of the fourth I-beam 12 at the other end on the first steel plate 13, and the force is uniformly diffused through the first steel plate 13 so as to achieve the purpose of equivalently covering the load. The invention has the advantages of simple structure, common materials, economy, reasonableness, convenient and reliable installation, the same side of the stress structure and the counter-force structure and the like, and can realize equivalent simulation of overlying load.
In this embodiment, as a further technical solution, the hinge seat includes: the base vertical plate 9, the rotating steel plate 14 and the pin shaft 7; the two base vertical plates 9 are welded to the third steel plate 10; the base vertical plate 9 is provided with a shaft hole; the rotating steel plate 14 is provided with a shaft hole, the rotating steel plate 14 is arranged at the bottom end of the third I-shaped steel 6, and the rotating steel plate 14 is inserted between the two base vertical plates 9; the pin shaft 7 is arranged in the shaft holes of the two base vertical plates 9 and the rotating steel plate 14 in a penetrating mode. The hinged seat functions as a fulcrum.
Specifically, the pin 7 with a diameter of 30mm is adopted in the embodiment.
In this embodiment, as a further technical solution, the third steel plate 10 is provided with a mounting hole, and the mounting hole of the third steel plate 10 is mounted on a screw 11 implanted in a concrete structure in a penetrating manner and is fixed by a nut. Considering the strength of concrete, the excessive tensile force may damage the concrete, and the application range of the device can be increased by calculating and adjusting the implantation depth of the screw rods 11 and the distance between the screw rods 11.
Specifically, the present embodiment employs a screw 11 of 16mm in diameter.
In this embodiment, the number of the devices can be adjusted according to the size of the overlying load, so as to achieve the purpose of equivalent overlying load.
In this embodiment, as a further technical solution, the second steel plate 4 and the third steel plate 10 are respectively strip-shaped steel plates, and the width of the first steel plate 13 is greater than the width of the second steel plate 4 and the width of the third steel plate 10.
Specifically, the second steel plate 4 and the third steel plate 10 are long steel plates having a thickness of 40 mm.
Specifically, the first steel plate 13 is a 40mm thick large steel plate.
In this embodiment, as a further technical solution, the jack device 1 is a hydraulic transmission structure. In this embodiment, as a further technical solution, a plurality of the jack devices 1 are supplied with oil through a serial line. Specifically, the hydraulic oil is YB-N32 in type, and is supplied by a serial line to ensure that the output of each jack device 1 is consistent.
In this embodiment, as a further technical solution, an angle steel support structure 8 is connected between the first i-beam 5 and the third i-beam 6.
In this embodiment, as a further technical solution, an angle steel support structure 8 is connected between the first i-beam 5 and the fourth i-beam 12.
Example two
The second embodiment further provides an installation method of the equivalent applying device for simulating the load of the overlying soil mass of the bridge bearing platform, which comprises the following steps:
s1, preprocessing a component:
processing various required steel components according to the requirements of design drawings, which comprises the following steps: the steel plate processing device comprises a first steel plate 13, a second steel plate 4, a third steel plate 10, a first I-shaped steel 5, a second I-shaped steel 2, a third I-shaped steel 6, a fourth I-shaped steel 12 and a hinge seat, wherein when each steel component is processed, the component is cut to be processed into a preset specific shape, and holes are pre-punched at a preset specific position;
s2, welding:
welding the main body component according to a design drawing, wherein the welding comprises welding between a first I-beam 5, a second I-beam 2, a third I-beam 6, a fourth I-beam 12 and a hinge seat, and the welding process requires no slag inclusion, cracks, air holes and undercut; the strength of the joint is ensured, the length of the welding seam is prolonged as much as possible at the position needing larger bearing force, and the structure checking calculation is carried out.
S3, drilling:
considering the installation of steel plate components in the later period, drilling holes in a concrete structure are strictly constructed according to the design interval, the maximum allowable deviation is +/-2 mm, the hole inclination is not more than 2 degrees every 10mm, and residues in the holes are cleaned by a blower after the holes are formed, so that a proper environmental condition is provided for injecting bar planting glue in the later period;
s4, implanting the reinforcing screw rod 11:
adopting automatic injection of bar-planting glue, firstly extruding a small amount of glue mixed unevenly in the front by using a glue gun, then injecting glue into a hole, ensuring the sequence from the bottom of the hole to the orifice, avoiding mixing air bubbles as much as possible, injecting the glue above 2/3 of the depth of the hole, screwing the screw rod 11 into the drilled hole, drawing up and down for several times, adhering the glue on the screw rod 11 in the maximum range, waiting for 24 hours, and not shaking the screw rod 11 in the period;
s5, integral assembly:
fixing a third steel plate 10 on a screw rod 11 implanted in a concrete structure by using a nut to form a base of the whole device, welding two base vertical plates 9 on the third steel plate 10, installing a jack device 1 at a corresponding position according to design through a pin shaft 7, the two base vertical plates 9 and a shaft hole of a rotating steel plate 14, and welding a plurality of groups of mechanical transmission frame mechanisms into a whole by using a second steel plate 4 and a steel bar 3;
s6, pushing by the jack device 1:
the jack devices 1 adopt hydraulic transmission and are supplied with oil through series circuits so as to ensure that the output of each jack device 1 is consistent, the load output by the jack devices 1 is equal to the load of the fourth I-shaped steel 12 at the other end on the first steel plate 13, and the force is uniformly diffused through the first steel plate 13 so as to achieve the purpose of equivalently covering the load.
In conclusion, the embodiment utilizes the jack thrust to achieve equivalent operation of the overlying load through transmission of the mechanical device based on the lever principle, and is an overlying load equivalent device suitable for an entity engineering test or an indoor model test. The problems that the overlying load cannot be buried due to structure monitoring and equivalence is difficult to realize in engineering tests due to volume and weight limitation are solved. The device adopts hydraulic jack as the power supply, and accessible control adjustment jack quantity, the model specification of the body material in the device and the anchor depth of screw rod 11 deal with different operating modes. The device has the advantages of simple and stable structure, economy, reasonableness and convenience in construction, the stress structure and the counter-force structure are on the same side, the practicability is strong, and a simple and feasible method and thought are provided for the aspect of equivalent simulation of a single load engineering test.
EXAMPLE III
The embodiment provides a comprehensive test system of an equivalent applying device for simulating the load of an overlying soil body of a bridge bearing platform. The embodiment is directed at the problem that the existing railway design is still designed in a professional mode under the condition of facing complex geology, so that the structure under an interaction combined system of a landslide-anti-slide pile-bridge structure is mostly lack of theoretical basis according to experience, the stress and deformation of the designed structure have the possibility of exceeding the limit, a single research means has inevitable defects, aiming at all the problems, the project develops comprehensive test research comprising numerical calculation, theoretical analysis, indoor test and field full-scale test, and the main test thought comprises the following steps:
firstly, selecting a proper test work point, and carrying out deep geomechanics analysis on the work point
Selecting a proper working point to determine a main shaft section (namely a prototype section), further determining a test section by combining the actual condition of the working point, carrying out basic geomechanical analysis on the section, determining the most unfavorable sliding surface and analyzing the current stable state of the slope body.
Secondly, the design of the test system is carried out at the selected work point, and the optimized design is carried out on the components of the test system
A landslide body, an anti-slide pile and bridge structure combined system test system is comprehensively developed, a field full-scale test system consisting of a model structure system, a large-tonnage servo jack loading system and a multifunctional comprehensive test system is constructed, technical and economic optimization is carried out on a plurality of technical links of each subsystem, and the purposes of meeting test requirements and reducing cost are achieved.
Thirdly, design of working conditions of loading test
And extracting the displacement of the depth position of the loading wall corresponding to the anti-slide pile under each unfavorable working condition as a displacement value of the jack pushing and loading wall, so as to realize the simulation of each working condition of the prototype section.
Fourthly, the interaction mechanism of the landslide-slide-resistant pile-bridge structure combined system is deeply researched and analyzed, and the interaction mechanism of the landslide, the slide-resistant pile and the bridge structure is deeply analyzed through field test data acquisition, processing and analysis.
Fifth, design optimization suggestions and engineering strategies
Suggestions with guiding significance are provided from three aspects of line selection, roadbed supporting and retaining reinforcement structures and bridge structure design optimization, and suitable engineering countermeasures are provided for built or under-construction engineering.
The overall scheme of this example is designed as follows:
as shown in fig. 1 and 8, the comprehensive test system mainly includes: bridge cap 102, bored pile 101, loading wall 106 (force transfer optimized loading structure) and slide-resistant pile 103; an equivalent applying device for simulating the load of the soil body coated on the bridge bearing platform is arranged between the bridge bearing platform 102 and the loading wall 106, and a concrete wall 104 is arranged between the three anti-slide piles 103; the loading wall 106 is positioned between the middle slide-resistant pile 103 and the bridge bearing platform 102; the loading wall 106 is connected with the middle slide-resistant pile 103 through a plurality of jacks 105, and the loading wall 106 is pushed through the jacks 105.
Through theoretical calculation, backfill soil is filled between the loading wall and the bearing platform, the weight of the backfill soil above the range of 5.65m of the width of the bearing platform is 61.5t, and in order to realize equivalent simulation, constraint equivalence is realized by adopting an overlying load equivalent applying mechanical hydraulic device through optimization design of various schemes. There are 10 groups of these devices equally spaced over 5.65m of the width of the platform, each group providing 15t of pressure for a total of 150 t. By utilizing the principle of equivalent lever, the force provided by the jack is transmitted to the backfill soil covered between the loading wall and the bearing platform through a mechanical device, and the 10 groups of devices can realize synchronous linkage pressurization.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.