CN113026773B - Frame lattice beam supporting system for expansive soil slope and construction method thereof - Google Patents

Frame lattice beam supporting system for expansive soil slope and construction method thereof Download PDF

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CN113026773B
CN113026773B CN202110304245.3A CN202110304245A CN113026773B CN 113026773 B CN113026773 B CN 113026773B CN 202110304245 A CN202110304245 A CN 202110304245A CN 113026773 B CN113026773 B CN 113026773B
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fixing
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double
assembled
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CN113026773A (en
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陈宾
卢葵
边兴宇
曾浩哲
张涛
吴洁云
刘通
龙啸宇
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Xiangtan University
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/20—Securing of slopes or inclines
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/20—Securing of slopes or inclines
    • E02D17/202—Securing of slopes or inclines with flexible securing means
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F3/00—Sewer pipe-line systems
    • E03F3/04—Pipes or fittings specially adapted to sewers
    • E03F3/046—Open sewage channels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
    • Y02A10/23—Dune restoration or creation; Cliff stabilisation

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
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  • Health & Medical Sciences (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)

Abstract

The invention discloses a lattice beam support system for an expansive soil slope and a construction method thereof. The system comprises a fabricated frame grid beam and an anchor rod. The assembled frame beam comprises a fixing piece, a connecting piece, an assembled beam member and an elastic piece. By utilizing the characteristic of assembly, the rapid dry construction can be carried out on site, and the construction efficiency is improved; by adding the elastic piece into the sash beam, the problem of large-area expansion deformation of the expansive soil slope is solved, the construction pressure of slope engineering is effectively reduced, and the stability of the expansive soil slope is effectively maintained. The assembled frame girder supporting structure of the system adopts novel splicing nodes, novel splicing modes and embedded elastic piece designs, improves the influence of deformation of a side slope on stability of the assembled frame girder, and improves the protection effect of the frame girder.

Description

Frame lattice beam supporting system for expansive soil slope and construction method thereof
Technical Field
The invention relates to slope protection engineering equipment, in particular to a lattice beam supporting system for an expansive soil slope and a construction method thereof, and belongs to the technical field of slope protection.
Background
The expansive soil is soil with wide distribution range in China and easy disaster induction. Because the engineering properties of the composite material have the characteristics of swelling, shrinkage, super consolidation and fissure compared with the common cohesive soil, the stability calculation and treatment scheme of the side slope are also different from those of other types of soil side slopes, and the composite material particularly has the deformation characteristics of obvious water absorption expansion and water loss shrinkage, and is easy to have adverse effects on the use of side slope engineering protective equipment. The scheme for slope landslide remediation of expansive soil commonly used in China at present comprises the following steps: the anti-slide piles, the anti-slide retaining walls, the prestressed anchor rods and the like are utilized. The anti-slide pile can flexibly select pile positions, the disturbance of a sliding body is small, the landslide on the whole operation line and the landslide control in a slow sliding stage are particularly beneficial, and the problems are easy to remedy if found in engineering. The anti-slip retaining wall has the advantages that the structural design is simple, but the arrangement position of the anti-slip retaining wall has certain limitation due to a plurality of factors affecting landslide; the prestressed anchor rod has the advantages of less investment and flexible arrangement, but has requirements on geological conditions, the anchoring section is arranged in a stable rock stratum, and the rock stratum is suitable for grouting. When the slope is remedied under the geological condition of the expansive soil, the schemes do not start from the characteristics of the expansive soil to fundamentally prevent the slope from being unstable, so that the short-term protection requirement can be met, and the control effect and the economical efficiency are not ideal.
Nowadays, along with the development of construction technology and economy, construction quality and construction period gradually become the main melody of engineering, so that an assembled structure with the advantages of high strength, short construction period, low consumption and the like is more and more paid attention to, in the traditional slope construction process, basically all-wet operation is adopted, construction is more troublesome, excavation and grooving are needed on a slope on site, steel bar construction is carried out in the groove, concrete is poured, and then maintenance is carried out. But the precision requirement of the assembly member is very high, so the problems of splicing the side slope assembly type frame grid beams and large deformation and even damage of the side slope protection engineering pressure caused by large-area deformation of the expansive soil side slope are gradually focused. The technical proposal of the industry for the problems basically adopts all-steel splicing, and the accuracy requirement of the splicing is guaranteed, but the reliability and the maintenance cost of the splicing are not controlled.
Chinese patent document CN111270693a discloses an assembled anchor cable frame grid beam and a construction method, the assembled anchor cable frame beam is formed by connecting intersection prefabricated members and connecting prefabricated members, the intersection prefabricated members are arranged in a row and column manner, and the intersection prefabricated members are connected with each other through the connecting prefabricated members; the end heads of the intersection prefabricated members which are positioned at the row and column edges and are not connected with the connection prefabricated members are connected with end socket prefabricated members; the anchor cable end is connected with the intersection prefabricated member through an anchor cable clamping piece. The prefabricated components are prefabricated in a concentrated mode in a professional prefabricated field and then conveyed to an excavated side slope for installation. The method adopts the assembled anchor cable frame grid beam to replace the existing integrally poured frame grid beam, so that the protection work efficiency is effectively improved, and the slope protection construction is completed in a short time. However, the problem that the expansion deformation of the side slope of the expansive soil causes large deformation and even damage of the side slope protection engineering is not solved.
Chinese patent CN104863162a discloses a foundation pit supporting system for expansive soil region and construction method thereof. The foundation pit side slope foundation pit comprises a flexible impermeable layer and a binding layer, wherein the flexible impermeable layer is paved on a foundation pit side slope, the binding layer is formed by arranging a plurality of longitudinal binding belts and a plurality of transverse binding belts in a staggered mode, and soil nails penetrating through the flexible impermeable layer and extending into the foundation pit side slope are fixedly arranged at the staggered positions of the longitudinal binding belts and the transverse binding belts. According to the foundation pit slope, the flexible impermeable layer is arranged on the foundation pit slope, when a foundation pit meets rainfall, the flexible impermeable layer can effectively prevent the rainwater from penetrating into the slope of the foundation pit slope, and effectively prevent the slope of the foundation pit slope from generating expansion force, even if the rainwater penetrates into the slope of the foundation pit slope, the slope of the foundation pit slope can have certain deformation under the double effects of the constraint effect and the flexible deformation effect of the flexible impermeable layer, so that the rapidly increased expansion force of the slope of the foundation pit slope can be effectively released, the load borne by soil nails is effectively reduced, and the stability of the foundation pit is ensured. The flexible impermeable layer is directly arranged on the slope, and as the expansive soil and the flexible impermeable layer are flexible, the flexible waterproof layer has limited slow release of the pressure generated by the expansion of the expansive soil (the main effect of the flexible waterproof layer is to prevent the water from entering the slope to expand and play a certain buffering role along the belt), and most of the expansion pressure generated by the whole expansive soil and the flexible impermeable layer is finally acted on the constraint layer and the anchor rod, so that the constraint layer and the anchor rod still need to bear huge pressure. Further, the expansive soil slope not only generates expansive pressure, but also has a downward force generated by sliding along the slope, and the flexible impermeable layer directly arranged on the slope has little relief effect on the part of force. The descending sliding force generated by the side slope almost completely acts on the binding layer and the anchor rod, and is extremely easy to damage the protection engineering.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a frame beam supporting system for an expansive soil slope and a construction method thereof, aiming at the characteristics of the expansive soil slope, an assembled frame beam supporting structure with a horizontal elastic structure and/or a vertical elastic structure is adopted, the construction process can be effectively accelerated through dry construction, the problem of large-area expansion deformation of the expansive soil slope is solved, the construction pressure of slope engineering is effectively reduced, and the stability of the expansive soil slope is effectively maintained.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
according to a first embodiment of the present invention, a lattice beam support system for an expansive soil slope is provided.
A lattice beam support system for an expansive soil slope includes fabricated lattice beams and anchor rods. The fabricated lattice beam includes a fixing piece, a connecting piece, and a fabricated beam member. The fixing pieces, the connecting pieces and the assembled beam members are all of multi-layer design in the direction perpendicular to the slope surface, and horizontal elastic pieces are arranged among layers of the fixing pieces, among layers of the assembled beam members and among layers of the connecting pieces. And the plurality of layers of assembled beam members are connected with the plurality of layers of fixing pieces through the plurality of layers of connecting pieces to form the assembled frame grid beam. The anchor rods anchor the plurality of layers of assembled sash beams through the plurality of layers of fixing pieces.
Preferably, the fixing member has a double-layer structure. The double-layer fixing piece comprises an upper fixing component and a lower fixing component. The upper fixing component is arranged above the lower fixing component, and a horizontal elastic piece is arranged at the superposition position between the upper fixing component and the lower fixing component. The upper surface of the double-layer fixing piece is also provided with a reserved anchor hole, and the reserved anchor hole sequentially penetrates through the upper fixing assembly, the horizontal elastic piece and the lower fixing assembly from top to bottom. Preferably, the upper fixing component and the lower fixing component are vertically symmetrical rigid components.
Preferably, all sides of the double-layer fixing piece are provided with splicing grooves. The splice groove includes an upper groove and a lower groove. The lower ends of all sides of the upper fixing assembly are provided with upper grooves. The upper ends of all sides of the lower fixing component are provided with lower grooves. The upper groove on any side surface of the upper fixing component and the lower groove on the side surface of the lower fixing component on the same side form a splicing groove together.
Preferably, all sides of the double-layer fixing piece are provided with a plurality of reserved fixing holes. The reserved fixing holes are uniformly distributed around the splicing groove.
Preferably, the plurality of layers of the connecting member has a double-layer structure. The double-layer connecting piece comprises an upper connecting component and a lower connecting component. The upper connecting component is arranged above the lower connecting component, and a horizontal elastic piece is arranged at the superposition position between the upper connecting component and the lower connecting component. Preferably, the upper connecting component and the lower connecting component are vertically symmetrical rigid components.
Preferably, the upper connecting assembly comprises an upper connecting plate, an upper connecting cylinder and an upper rib. The upper connecting cylinder is of a long cylindrical structure, and the upper connecting plates are arranged at the front end and the rear end of the upper connecting cylinder. The upper rib is arranged at the joint of the upper connecting cylinder and the upper connecting plate, one end of the upper rib is fixed on the upper connecting cylinder, and the other end of the upper rib is fixed on the upper connecting plate.
Preferably, the lower connection assembly comprises a lower connection plate, a lower connection cylinder and a lower rib. The lower connecting cylinder is of a long cylindrical structure, and the lower connecting plates are arranged at the front end and the rear end of the lower connecting cylinder. The lower rib is arranged at the joint of the lower connecting cylinder and the lower connecting plate, one end of the lower rib is fixed on the lower connecting cylinder, and the other end of the lower rib is fixed on the lower connecting plate.
Preferably, the upper connecting plate and the lower connecting plate together form two end faces of the double-layer connecting piece. One end face of the double-layer connecting piece is provided with a splicing convex head, and the other end face of the double-layer connecting piece is provided with a reserved connecting bolt. The splicing convex head is matched with the splicing groove.
Preferably, the splicing protruding head comprises an upper splicing protruding head and a lower splicing protruding head. The upper splicing protruding head is arranged at the lower end of the upper connecting plate, and the lower splicing protruding head is arranged at the upper end of the lower connecting plate. And reserved connecting bolts are arranged on the other end face of the double-layer connecting piece, and the upper connecting plate and the lower connecting plate.
Preferably, a plurality of reserved connecting holes are formed in two end faces of the double-layer connecting piece. The reserved connecting holes are uniformly distributed around the splicing raised heads and the reserved connecting pegs. Wherein, the reserved connecting hole and the reserved fixing hole which are positioned on the same end face with the splicing convex head correspond to each other.
Preferably, a plurality of the fabricated beam members are of a double-layered structure. The double-deck assembled beam member includes an upper beam assembly and a lower beam assembly. The upper beam component is arranged above the lower beam component, and a horizontal elastic piece is arranged at the superposition position between the upper beam component and the lower beam component.
Preferably, the double-layer fabricated beam structure further comprises reserved steel bars. The reserved steel bars comprise upper steel bars and lower steel bars. And a plurality of upper steel bars are arranged at two ends of the upper beam assembly. And a plurality of lower reinforcing steel bars are arranged at two ends of the lower beam assembly. The reserved reinforcing steel bars at any end of the assembled beam member correspond to reserved connecting holes in the end face of the reserved connecting pin on the connecting piece.
Preferably, the ends of the upper steel bar and the lower steel bar are provided with threads.
Preferably, the system further comprises a vertical elastic member vertically disposed at a middle portion of the fabricated beam member in a length direction and dividing the fabricated beam member into a left member and a right member. The vertical elastic member and the horizontal elastic member are vertically intersected and integrally formed into a whole (the length direction of the vertical elastic member is consistent with the length direction of the horizontal elastic member).
Preferably, when the fabricated beam member is a double-layered structure, the left member includes an upper left member and a lower left member. The right member includes an upper right member and a lower right member. The vertical elastic piece and the horizontal elastic piece are integrally formed to form a cross-shaped elastic piece which is vertically intersected. The cross-shaped elastic piece is positioned in the middle of the upper left component, the lower left component, the upper right component and the lower right component.
Preferably, the system further comprises a waterproof geomembrane. The waterproof geomembrane is arranged between the assembled frame grid beam and the slope surface.
Preferably, the system further comprises a drainage tank, wherein the drainage tank is arranged at the top of the side slope and/or at the bottom of the side slope.
Preferably, the horizontal elastic piece and the vertical elastic piece are high-strength elastic rubber sheets.
Preferably, the fixing member and the connecting member are all rigid members made of steel.
According to a second embodiment of the present invention, a construction method for a lattice beam support system for an expansive soil slope is provided.
A method of constructing a lattice beam support system for an expansive soil slope or a system according to the first embodiment, the method comprising the steps of:
1) And trimming and measuring the side slope to determine the installation hole site of the anchor rod.
2) And determining the specification of the assembled frame grid beam according to the measurement data of the side slope.
3) And prefabricating the fixing piece, the connecting piece, the assembled beam component, the horizontal elastic piece and the vertical elastic piece into a factory according to the specification of the assembled frame grid beam.
4) And placing fixing pieces on the mounting hole sites of all the anchor rods, and enabling the reserved anchor holes to correspond to the mounting hole sites. And then connecting the fixing pieces through the connecting pieces and the assembly type beam members to form a grid-shaped assembly type frame beam, finally fixing the fixing pieces on the expansive soil slope after the anchor rods pass through the reserved anchor holes of the fixing pieces, and simultaneously carrying out corrosion prevention treatment on the exposed rigid connecting parts.
Preferably, the method further comprises the steps of:
5) After the installation hole position of the anchor rod is determined, punching the installation hole position to form a drilling hole, grouting the drilling hole, and finally fixing the anchor rod in the grouting drilling hole.
6) Before the assembled frame beams are installed, a waterproof geomembrane is paved on the surface of the side slope.
7) And pre-excavating drainage grooves at the top and bottom of the side slope.
Preferably, the fixing piece, the connecting piece and the assembled beam member are all at least of a double-layer structure, and the horizontal elastic piece is arranged between the layers of the fixing piece, the connecting piece and the assembled beam member. Preferably, the horizontal elastic members mounted between the two layers of the fixing member, between the two layers of the connecting member and between the two layers of the fabricated beam member are one integral elastic member.
Preferably, when the vertical elastic piece is still required to be prefabricated and installed in the double-layer fixing piece, the double-layer connecting piece and the double-layer assembled beam member, the vertical elastic piece divides the double-layer fixing piece, the double-layer connecting piece and the double-layer assembled beam member into left and right rows along the length direction. The vertical elastic piece and the horizontal elastic piece are vertically intersected and form a cross-shaped elastic piece.
Preferably, the double-layer connecting piece and the double-layer assembled beam member are connected in advance in layers by bolts in a factory, and the exposed steel bars are poured by concrete to form a combined whole. And a gap for installing the cross-shaped elastic piece is reserved on the whole of the poured combination, or the cross-shaped elastic piece, the double-layer connecting piece and the double-layer assembled beam member are poured in advance in a factory to form a combined whole.
Preferably, the fixing member is pre-filled with a viscous substance in a reserved anchor hole thereof when prefabricated in a factory.
In the prior art, the slope protection engineering basically adopts full wet operation, the construction is more troublesome, the slope is required to be excavated and grooved on site, the steel bar construction is carried out in the groove, the concrete is poured, and then the maintenance is carried out, so that the method has the characteristics of long construction period and high cost, and is greatly influenced by weather. The assembly type member has higher precision requirement, and the problem of splicing accuracy of the side slope assembly type frame grid beam is a focus. The technical proposal of the industry for the problems basically adopts all-steel splicing, and the accuracy requirement of the splicing is guaranteed, but the reliability and the maintenance cost of the splicing are not controlled. And the prefabricated concrete poured assembled frame grid beams are adopted for a small part, so that the assembly efficiency and the assembly precision are ensured, but the problems that the construction difficulty is increased and the frame grid beam protection engineering is easily damaged due to large-area deformation of the expansive soil slope cannot be effectively solved, and the stability of the expansive soil slope cannot be effectively maintained. Expansion deformation of the expansive soil slope tends to be applied to the cellular beam guard structure to apply outward axial pressure (pressure outward perpendicular to the slope) and downward pressure (sliding pressure downward parallel to the slope); the two forces have extremely high destructiveness on the latticed lattice beams, the latticed lattice beams are not solved and improved effectively all the time, the maintenance cost of the lattice beam protection engineering is greatly improved, the service life of the lattice beam is prolonged, and the risk of landslide is increased.
In the invention, a multi-layer assembled sash beam supporting structure (preferably a prefabricated double-layer assembled sash beam) with a horizontal elastic structure and/or a vertical elastic structure is adopted aiming at the characteristics of the expansive soil side slope; on one hand, by utilizing the characteristics of prefabricated assembly, the rapid dry construction can be performed on site, and the construction efficiency is improved; on the other hand, by adding the horizontal elastic piece and/or the vertical elastic piece (the elastic piece is preferably a high-strength rubber sheet) into the double-layer beam, the elastic potential energy generated by the expansion soil can be stored when the expansion soil expands, and the force is released when the expansion soil contracts, so that the property of reducing the expansion soil to absorb water and expand and lose water and contract is achieved, and the stability of the side slope is damaged. The assembled frame grid beam supporting structure adopts novel splicing nodes and splicing modes, improves the reliability of the structure, is also designed with corresponding prevention measures aiming at the expansion characteristics of the expansive soil slope, improves the influence of deformation (expansion and sliding) of the slope on the assembled frame grid beam, and improves the integral stability of the expansive soil slope.
In the invention, the frame beam supporting system for the expansive soil slope is a multi-layer assembled frame beam supporting structure, and the multi-layer assembled frame beam supporting structure comprises a plurality of layers of fixing pieces (central nodes), a plurality of layers of assembled beam members, a plurality of layers of connecting pieces (connecting nodes) and elastic pieces (preferably high-strength elastic rubber sheets). The multi-layer assembled beam member is arranged on the slope surface of the expansive soil slope, and because the system adopts the basic dry construction, the side slope is generally required to be treated in advance before construction, the double-layer assembled beam member is required to be designed according to the actual measurement data of the slope (the number of layers and the corresponding specification of each accessory monolayer are determined), then the prefabricated part is prefabricated by a factory, and the embedded part is treated on the transportation site, and the process is required to adopt the reinforcing steel bars and the concrete with certain specifications to ensure the design requirement of the member.
In the invention, a new connection mode is provided for the construction of the assembled frame grid beam, and the fixing piece, the connecting piece and the assembled beam component which are all multi-layer (generally double-layer) are obtained through factory prefabrication. Wherein, the mounting is the square all steel construction of general shape, and its orientation all is provided with the splice groove on the side of four directions for the horizontal plane (being on a parallel with the slope surface) to satisfy the connection demand rather than the connecting piece. The connecting piece is a combined rigid connecting node (also preferably made of all-steel material) in a lattice mode and is formed by welding or integrally casting a connecting plate, a reinforcing rib, a reserved connecting bolt, a splicing convex head and the like. The connecting piece needs to be provided with the concatenation protruding head that coincides with the concatenation recess on its connecting plate that is connected with the mounting (for the convenience of description, will be close to the connecting plate of mounting one end and be called front end connecting plate, otherwise be the rear end connecting plate, the following the same) to this front end connecting plate still needs to fix through high strength bolt with the corresponding side of mounting (generally, the specification height of mounting and connecting piece should be unanimous, in order to improve the reliability of connection accuracy, and the number of piles and the height of connecting piece, mounting and multilayer assembled beam member are all unanimous, the individual layer of the different component of common layer links to each other with the individual layer and forms a plurality of whole individual layers, a plurality of whole individual layers are recombined into multilayer assembled lattice beam structure). The assembled beam member is a prefabricated reinforced concrete assembly (generally, a cuboid structure and corresponding dimension design can be made according to different types of slopes, the length of the assembled beam member meets the national standard requirements), and rolling straight threads are arranged at the ends of the reinforced bars reserved at the two ends of the assembled beam member. The rear end connecting plate of the connecting piece is provided with reserved connecting bolts and reserved connecting holes, and when any one end of the assembled beam member is connected with the rear end connecting plate of the connecting piece, the steel bars with threads at the end parts of the assembled beam member only need to pass through the reserved connecting holes and then are fixed through high-strength bolts. It should be noted that, when the mill is prefabricated, the connecting piece of individual layer and the assembled beam member of individual layer need be fixed in advance, then carry out secondary pouring with naked reinforcing bar of concatenation department and peg, be called steel-concrete composite beam member (can reduce the connection number of component node, improve efficiency of construction), then transport to the scene, only need with the connecting piece at assembled beam member both ends with the mounting carry out the connection through high-strength bolt and fix can, and then realize the quick accurate assembly of latticed multilayer assembled frame grid roof beam, and select to avoid the plastic hinge region, and the cross-section position of being convenient for the construction connects, in order to improve its shock resistance.
It should be noted that, connect assembled beam member and mounting through the connecting piece, on the one hand can improve the installation effectiveness and the precision of assembled sash roof beam. On the other hand, when the expansive soil slope expands, the expansion force mainly acts on the assembled beam members (the contact surfaces of the fixing pieces and the connecting pieces with the slope are smaller, so that the stress is smaller), the expansion pressure vertical to the slope is exerted on the assembled frame grid beams, then the force is transmitted to the connecting pieces by the assembled frame grid beams, and finally the connecting pieces are transmitted to the fixing pieces and act on the anchor rods. In this process, the axial pressure perpendicular to the ramp surface becomes radial force when the assembled lattice beam transmits force to the connecting piece, and then becomes axial force when the connecting piece transmits force to the fixing piece; that is, the axial force applied directly to the fabricated lattice beam by the expansive soil slope eventually acts upon the anchor (including the anchor rod), and the force transmission undergoes the following transition: axial force-radial force-axial force; in this process, the initial force is released by great consumption after one conversion of the connecting piece, so that the force acting on the fixing piece (including the anchor rod) is smaller finally, the pressure of the fixing piece (including the anchor rod) is reduced, and the stability of the frame girder structure is maintained.
In the invention, horizontal elastic pieces (preselected as high-strength elastic rubber) are arranged between layers of each assembly (fixing piece, connecting piece and assembly beam component) of the multi-layer assembly type frame beam, and the fixing piece, the connecting piece and the horizontal elastic pieces between the assembly beam components are integrated in order to improve the assembly efficiency; meanwhile, in order to ensure the overall elasticity of the horizontal elastic piece, the horizontal elastic piece has a certain thickness, and the thickness design of the horizontal elastic piece is carried out according to actual conditions aiming at different expansive soil slopes, so that the capacity of inhibiting the expansive soil deformation of the system is ensured, and the reliability of the supporting structure of the system is further improved. The horizontal elastic pieces are arranged between the layers of the multi-layer assembled frame grid beams (in general, when the multi-layer assembled frame grid beams are prefabricated in a factory, the multi-layer assembled frame grid beams are required to be assembled with the connecting pieces and the assembled beam members into a combined whole, only partial horizontal elastic pieces which need to be filled between the layers of the fixing pieces are required to be reserved at two ends of the combined whole, and the combined whole is performed in advance, so that the site construction efficiency can be effectively improved, the installation accuracy can be improved, the problem that the horizontal elastic pieces are required to be installed on site easily to cause uneven paving of the horizontal elastic pieces can be avoided, the buffer and energy absorption structure can be also avoided, when the expansive soil is expanded and deformed, the lower-layer frame grid beams are extruded, so that the horizontal elastic pieces of the multi-layer assembled frame grid Liang Cengjian are influenced by the deformation difference of the upper-layer frame grid beams and the lower-layer frame beams to generate small-range deformation, and therefore the energy generated by the expansive soil is buffered and absorbed, after the expansive soil is contracted, the stored energy is released, and most of the released energy is transmitted back to the soil layer, so that the expansive soil is reduced from the original state, and compared with the traditional device when the expansive soil is expanded to the side slope, the side slope stability is greatly lost, and the side slope stability is greatly improved; it should be noted that, setting the horizontal elastic piece between the multilayer assembled layer, can also play the inflation soil and expand when producing pressure for have certain buffering between upper and lower floor's rigidity assembled beam member, avoid the two direct actions unable unloading force and form extrusion collision (can lead to beam member fracture when serious, and then greatly reduced the protective effect of frame grid roof beam), horizontal elastic piece has still played the effect of protection assembled beam member promptly. The above-mentioned effect cannot be obtained by arranging the horizontal elastic member between the frame beam and the side slope, because the flexible horizontal elastic member and the flexible soil layer are attached to each other, the two form a flexible whole body, the effect of absorbing the pressure generated by the expansion of the expansive soil side slope is limited, and most of the force can only be exerted on the rigid frame beam in a clockwise direction (the horizontal elastic member is similar to a small ship with wave and flow, and can only be assimilated by the extra-large flexible body of the expansive soil side slope due to the fact that the horizontal elastic member attached to the side slope surface can only 'follow wave and flow', and the two exert the force on the frame beam together), so that the force transmitted to the beam member cannot be absorbed and consumed, and the beam member is extremely easy to damage.
In the invention, the assembled beam member is also provided with a vertical elastic piece, and the vertical elastic piece is vertically arranged in the middle of the assembled beam member along the length direction of the assembled beam member to divide the assembled beam member into a left member and a right member. The vertical elastic piece and the horizontal elastic piece are vertically intersected (crisscross) and integrally formed into a whole. When the assembled beam member is of a double-layer structure, the vertical elastic member and the horizontal elastic member divide the double-layer assembled beam member into four small cuboid beam members with the same specification. When prefabricated in a factory, the length of the vertical elastic piece is consistent with that of the assembled beam component, and the length of the horizontal elastic piece is equal to that of the two fixing pieces, the two connecting pieces and the assembled beam component after being connected in series. Meanwhile, in the prefabrication process of a factory, the double-layer assembled beam member, the double-layer connecting piece, the vertical elastic piece and the horizontal elastic piece are all required to be connected and poured into a whole in advance (the double-layer connecting piece is required to be connected to the two ends of the assembled beam member). In the grid-shaped assembled lattice beam structure, the main stress component is an assembled beam component, and the assembled beam component comprises transverse beams and vertical beams which are arranged transversely. In practical engineering, the expansive soil slopes are slope slopes with certain inclined gradients, and the slopes also have a sliding trend. The assembled frame beams installed on the side slopes are mainly impacted by two forces, one is the outward pressure (called axial force) perpendicular to the slope surface, which is formed by the expansion of the expansive soil slope, the axial force integrally acts on the assembled frame beams, and the assembled beam components are buffer-protected by the horizontal elastic pieces (see the detailed description of the prior art). Another force is the sliding pressure (downforce) parallel to the slope generated by the tendency of the expansive soil slope to slide down, which, because the direction of the slope sliding down is uncertain but generally downward, can be broken down into a horizontal force directed parallel to the slope on both sides of the slope and a vertical horizontal force directed downward parallel to the slope. Wherein, the horizontal force mainly acts on the vertical beam, and the vertical horizontal force mainly acts on the cross beam. Because the directions of the two forces are parallel to the sloping surface, the horizontal elastic pieces which are also parallel to the sloping surface play a role in relieving and absorbing the two forces, and therefore the vertical elastic pieces which are perpendicular to the horizontal elastic pieces are arranged on the length directions of the cross beams and the vertical beams, the relieving and absorbing of the two forces can be well realized (the vertical elastic pieces in the cross beams relieve and absorb the vertical horizontal forces, the vertical elastic pieces of the vertical beams relieve and absorb the horizontal forces), so that the buffer protection effect on the cross beams and the vertical beams is realized, and the overall protection effect of the multi-layer assembled frame grid beam is improved.
In the invention, the assembled beam member is a stressed key part of the frame grid beam, the strength, the rigidity, the ductility and the like of the assembled beam member directly influence the performance of the whole structure, the single-layer assembled beam member is of a reinforced concrete structure and is of a cuboid structure as a whole, at least four or multiple of four main ribs (reserved steel bars) are arranged at two ends of the single-layer assembled beam member, preferably four main ribs, and if the assembled beam member is a double-layer assembled beam member, eight or more main ribs are required at least, meanwhile, the member is subjected to steel bar reservation treatment, rolling straight threads are arranged at the ends of the main ribs, so that the assembled beam member is conveniently connected with connecting pieces in a splicing way (generally, high-strength bolts are adopted for bolting, and exposed steel bars after connection are poured, so that the single-layer connecting pieces and the single-layer assembled beam member form a steel-concrete combined node which is used for connecting two single-layer fixing pieces).
In the present invention, the thickness of the horizontal elastic member is 1 to 1000mm, preferably 10 to 500mm, more preferably 30 to 200mm. It should be noted that the horizontal elastic members are filled in the whole frame beams, and fig. 4 is for convenience of illustration, and the whole horizontal elastic members are required to function better.
In the present invention, the fixing member (double layer) has a square structure, and the length of any one edge thereof is 10 to 1000cm, preferably 30 to 800cm, more preferably 50 to 500cm, still more preferably 80 to 300cm.
In the invention, the connecting piece (double-layer) is of a cuboid structure, and the cross section of the connecting piece (double-layer) is of a square cross section with the same size as the fixing piece; the length thereof is 30-2000cm, preferably 50-1000cm, more preferably 80-500cm, still more preferably 100-300cm.
In the invention, the assembled beam member (double-layer) is of a cuboid structure, and the cross section of the assembled beam member (double-layer) is of a square cross section with the same size as the fixing piece; the length is 0.5-100m, preferably 0.8-80m, more preferably 1-50m, still more preferably 1.5-30m, still more preferably 2-15m.
In the invention, the length ratio of the fixing piece, the connecting piece and the assembled beam component is 1:1-50:1-300, preferably 1:1.2-40:10-200, and more preferably 1:1.5-30:30-100.
In the invention, all parts are connected with each other through high-strength bolts, wherein the center node (fixing piece) and the connecting node (connecting piece) are respectively provided with bolts and threaded holes through the two nodes, and then are connected through a certain number of bolts; the connecting node is connected with the multi-layer assembly beam member by arranging rolling straight threads at the end of the main bar (reserved steel bar), and is fixedly connected with the connecting steel plate (provided with reserved connecting holes) through high-strength bolts. When all the components are connected by bolts, the specifications of the bolts and the nuts can be freely selected and combined according to design requirements, preferably 10.9-level thickened nuts matched with the diameters of the main ribs are selected, and the bolts are preferably selected from M16 x 120 cylindrical head welding nails made of rivet steel materials.
In a specific embodiment, after the expansive soil is deformed for a plurality of times, after the device connecting node and the assembly beam are in failure, the failure part can be replaced and used in the whole. Because the device adopts prefabricated assembly type construction, the integrity of the device and the individual functions of the components can be completely embodied, so that the device can be replaced and replaced for multiple times at different invalid positions, and the influence on the integral effect of the device is small.
In the invention, the anchor rod can be selected from various types in the prior art, and the construction is carried out by adopting a full-dry method for matching with the assembled frame beam supporting structure of the system, so that the construction is preferably carried out by adopting an umbrella-shaped anchor rod.
In the invention, geotechnical engineering investigation is needed to be carried out on an engineering site before the construction of the side slope, and the specification of the anchor rod and the overall specification of the multi-layer assembled frame beam are determined according to the design requirement. And determining the thickness of the horizontal elastic piece and the vertical elastic piece according to the exploration result and the national standard, the detailed specification and the layer number requirement of the fixing piece, the connecting piece and the assembled beam member, and simultaneously, reasonably designing the waterproof geomembrane and the drainage tank and determining the space position, thereby ensuring the reliability of the whole system. The required components are prefabricated in a factory, and finally the components are transported to a construction site for standby by using a carrier in the construction process. In the construction process, each part can be spliced, and for the exposed spliced node reinforcing steel bars, anti-corrosion treatment (such as filling of concrete is adopted to prevent the exposed spliced node reinforcing steel bars from rusting) can be carried out on the periphery of the exposed spliced node reinforcing steel bars so as to improve the service life of the system and recheck the connection condition of each part, thereby ensuring the successful action of the whole support structure and the side slope.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the system adopts a novel node connection mode, fully utilizes the performances of reinforced concrete and steel members, solves the problems of connection precision and material consumption, improves the maintenance capability of the device, greatly reduces the cost and enhances the practicability of the device compared with all-steel fabricated grid beams in the industry. The commercial popularization potential of the device is improved.
2. The system adopts the combination of the multi-layer assembled beam component and the high-strength rubber sheet (elastic piece) with certain thickness, makes a reasonable solution to the problem of the expansion soil slope deformation, relieves and releases the expansion pressure of the expansion soil slope through the horizontal elastic piece, and relieves the axial pressure between the vertical rigid layers of the multi-layer assembled frame beam; the horizontal force and the vertical horizontal force generated by the sliding trend of the expansive soil side slope are relieved and released through the vertical elastic piece, and the horizontal pressure between the horizontal rigid layers of the multi-layer assembled frame is relieved; impact protection between the rigid members of the multi-layer assembled frame girder and the rigid members is realized through the horizontal elastic pieces and the vertical elastic pieces, and stability of the multi-layer assembled frame girder and protection effect on the expansive soil slope are improved.
3. The system adopts the prefabricated frame beam supporting structure, when the system is used for a certain period, if a part of components fail, the system is convenient to adjust, maintain and replace after being disassembled, saves maintenance and renovation costs, and is beneficial to maintaining the stability of the side slope.
Drawings
Fig. 1 is an overall side view of a lattice beam support system for an expansive soil slope according to the present invention.
Fig. 2 is an overall top view of a lattice beam support system for an expansive soil slope according to the present invention.
FIG. 3 is a node unit connection diagram of the lattice beam support system for an expansive soil slope according to the present invention.
Fig. 4 is an exploded view of a node unit of the lattice beam supporting system for an expansive soil slope according to the present invention.
Fig. 5 is a structural view of the double-layered fixing member according to the present invention.
Fig. 6 is a structural view of the double-layered connector according to the present invention.
FIG. 7 is a block diagram of a two-layer fabricated beam structure according to the present invention.
Fig. 8 is a block diagram of a double-layered fabricated beam structure according to the present invention having vertical elastic members.
Reference numerals: 1: assembling type frame grid beams; 11: a fixing member; 1101: an upper fixing assembly; 1102: a lower fixing assembly; 1103: reserving anchor holes; 1104: a splice groove; 110401: an upper groove; 110402: a lower groove; 1105: reserving a fixing hole; 12: a connecting piece; 1201: an upper connection assembly; 120101: an upper connecting plate; 120102: an upper connecting cylinder; 120103: a rib is arranged; 1202: a lower connection assembly; 120201: a lower connecting plate; 120202: a lower connecting cylinder; 120203: a lower rib; 1203: splicing the raised heads; 120301: a splicing convex head is arranged on the upper part; 120302: a lower splicing convex head; 1204: reserving a connecting pin; 1205: reserving a connecting hole; 13: a fabricated beam member; 1301: an upper beam assembly; 1302: a lower beam assembly; 1303: reserving reinforcing steel bars; 130301: a reinforcing steel bar is arranged; 130302: lower reinforcing steel bars; 13A: a left member; 13B: a right member; 1301A: an upper left member; 1301B: an upper right member; 1302A: a lower left member; 1302B: a lower right member; 14: a horizontal elastic member; 15: a vertical elastic member; 2: a bolt; 3: waterproof geomembranes; 4: a drainage channel; 5: and (5) a side slope.
Detailed Description
The following examples illustrate the technical aspects of the invention, and the scope of the invention claimed includes but is not limited to the following examples.
A lattice beam support system for an expansive soil slope comprises an assembled lattice beam 1 and anchor rods 2. The fabricated frame lattice beam 1 comprises a fixing piece 11, a connecting piece 12 and a fabricated beam member 13. The fixing pieces 11, the connecting pieces 12 and the assembled beam members 13 are all of multi-layer design in the direction vertical to the slope surface of the slope, and horizontal elastic pieces 14 are arranged among layers of the fixing pieces 11, among layers of the assembled beam members 13 and among layers of the connecting pieces 12. The multi-layer assembled beam member 13 is connected with the multi-layer fixing member 11 through the multi-layer connecting member 12 to form the multi-layer assembled frame beam 1. The anchor rods 2 anchor the plurality of layers of the assembled frame beams 1 through the plurality of layers of the fixing pieces 11.
Preferably, the fixing member 11 has a double-layer structure. The double-layered fixing member 11 includes an upper fixing member 1101 and a lower fixing member 1102. The upper fixture 1101 is disposed above the lower fixture 1102 and a horizontal spring 14 is disposed at the overlap therebetween. The upper surface of the double-layer fixing member 11 is further provided with a reserved anchor hole 1103, and the reserved anchor hole 1103 sequentially penetrates through the upper fixing assembly 1101, the horizontal elastic member 14 and the lower fixing assembly 1102 from top to bottom. Preferably, the upper fixture 1101 and the lower fixture 1102 are rigid members that are vertically symmetrical.
Preferably, the double-layer fixing member 11 is provided with a splicing groove 1104 on all sides. The splice groove 1104 includes an upper groove 110401 and a lower groove 110402. The lower ends of all sides of the upper fixture 1101 are provided with upper grooves 110401. The upper ends of all sides of the lower fixing member 1102 are provided with lower grooves 110402. The upper groove 110401 of any one side of the upper fixture 1101 and the lower groove 110402 of the side of the lower fixture 1102 of the same side thereof together constitute a splice groove 1104.
Preferably, a plurality of reserved fixing holes 1105 are arranged on all sides of the double-layer fixing piece 11. The reserved fixing holes 1105 are uniformly distributed around the splicing groove 1104.
Preferably, the multiple layers of the connector 12 are of a double layer construction. The dual layer connector 12 includes an upper connector assembly 1201 and a lower connector assembly 1202. The upper linkage assembly 1201 is disposed above the lower linkage assembly 1202 with a horizontal spring member 14 disposed in the overlap therebetween. Preferably, the upper and lower connection assemblies 1201, 1202 are rigid members that are vertically symmetrical.
Preferably, the upper connection assembly 1201 includes an upper connection plate 120101, an upper connection cylinder 120102, and an upper rib 120103. The upper connecting cylinder 120102 has an elongated cylindrical structure, and the upper connecting plate 120101 is provided at both front and rear ends of the upper connecting cylinder 120102. The upper rib 120103 is disposed at the connection between the upper connecting cylinder 120102 and the upper connecting plate 120101, and one end of the upper rib 120103 is fixed to the upper connecting cylinder 120102, and the other end is fixed to the upper connecting plate 120101.
Preferably, the lower connection assembly 1202 includes a lower connection plate 120201, a lower connection barrel 120202, and a lower rib 120203. The lower connecting cylinder 120202 has an elongated cylindrical structure, and the lower connecting plates 120201 are provided at both front and rear ends of the lower connecting cylinder 120202. The lower rib 120203 is disposed at the connection between the lower connecting tube 120202 and the lower connecting plate 120201, and one end of the lower rib 120203 is fixed to the lower connecting tube 120202, and the other end is fixed to the lower connecting plate 120201.
Preferably, the upper connecting plate 120101 and the lower connecting plate 120201 together form two end faces of the double-layered connecting member 12. A splicing protrusion 1203 is provided on one end face of the double-layer connector 12, and a reserved connection pin 1204 is provided on the other end face. The mating protrusion 1203 mates with the mating recess 1104.
Preferably, the splicing protrusion 1203 includes an upper splicing protrusion 120301 and a lower splicing protrusion 120302. On one end face of the double-layered connecting member 12, the upper splice boss 120301 is provided at the lower end of the upper connecting plate 120101, and the lower splice boss 120302 is provided at the upper end of the lower connecting plate 120201. On the other end face of the double-layered connecting member 12, reserved connecting pegs 1204 are provided on both the upper connecting plate 120101 and the lower connecting plate 120201.
Preferably, a plurality of reserved connection holes 1205 are arranged on two end surfaces of the double-layer connecting piece 12. The reserved connecting holes 1205 are uniformly distributed around the splicing protruding head 1203 and the reserved connecting studs 1204. Wherein, the reserved connection hole 1205 and the splicing protruding head 1203 positioned on the same end face correspond to the reserved fixing hole 1105.
Preferably, the fabricated beam member 13 has a double-layered structure. The double-deck fabricated beam member 13 includes an upper beam assembly 1301 and a lower beam assembly 1302. The upper beam assembly 1301 is disposed above the lower beam assembly 1302 and a horizontal spring 14 is disposed at the overlap therebetween.
Preferably, the double-layered fabricated beam member 13 further includes reserved reinforcement 1303. The reserved reinforcement 1303 includes an upper reinforcement 130301 and a lower reinforcement 130302. Both ends of the upper beam assembly 1301 are provided with a plurality of upper reinforcing bars 130301. Both ends of the lower beam assembly 1302 are provided with a plurality of lower reinforcing bars 130302. Reserved steel bars 1303 at either end of the assembled beam member 13 correspond to reserved connection holes 1205 on the end face of the connecting piece 12 provided with reserved connection pins 1204.
Preferably, the ends of the upper reinforcement bar 130301 and the lower reinforcement bar 130302 are each provided with threads.
Preferably, the system further comprises a vertical elastic member 15, wherein the vertical elastic member 15 is vertically arranged at the middle part of the fabricated beam member 13 along the length direction and divides the fabricated beam member 13 into a left member 13A and a right member 13B. The vertical elastic member 15 is perpendicularly intersected with the horizontal elastic member 14 and integrally formed as a single body (the longitudinal direction of the vertical elastic member 15 is identical to the longitudinal direction of the horizontal elastic member 14).
Preferably, when the fabricated beam member 13 is a double-layered structure, the left member 13A includes an upper left member 1301A and a lower left member 1302A. The right member 13B includes an upper right member 1301B and a lower right member 1302B. The vertical elastic member 15 and the horizontal elastic member 14 are integrally formed to form a cross-shaped elastic member which vertically intersects. The cross-shaped elastic member is positioned in the middle of the upper left member 1301A, the lower left member 1302A, the upper right member 1301B, and the lower right member 1302B.
Preferably, the system further comprises a waterproof geomembrane 3. The waterproof geomembrane 3 is arranged between the assembled frame grid beam 1 and the slope surface.
Preferably, the system further comprises a drainage tank 4, wherein the drainage tank 4 is arranged at the top of the side slope and/or at the bottom of the side slope.
Preferably, the horizontal elastic member 14 and the vertical elastic member 15 are high-strength elastic rubber sheets.
Preferably, the fixing member 11 and the connecting member 12 are all rigid members made of steel.
Example 1
As shown in fig. 1-4, a lattice beam support system for an expansive soil slope comprises assembled lattice beams 1 and anchor rods 2. The fabricated frame lattice beam 1 comprises a fixing piece 11, a connecting piece 12 and a fabricated beam member 13. The fixing pieces 11, the connecting pieces 12 and the assembled beam members 13 are all of multi-layer design in the direction vertical to the slope surface of the slope, and horizontal elastic pieces 14 are arranged among layers of the fixing pieces 11, among layers of the assembled beam members 13 and among layers of the connecting pieces 12. The multi-layer assembled beam member 13 is connected with the multi-layer fixing member 11 through the multi-layer connecting member 12 to form the multi-layer assembled frame beam 1. The anchor rods 2 anchor the plurality of layers of the assembled frame beams 1 through the plurality of layers of the fixing pieces 11.
Example 2
Example 1 was repeated, as shown in fig. 5, except that the multilayered fixing member 11 had a double-layered structure. The double-layered fixing member 11 includes an upper fixing member 1101 and a lower fixing member 1102. The upper fixture 1101 is disposed above the lower fixture 1102 and a horizontal spring 14 is disposed at the overlap therebetween. The upper surface of the double-layer fixing member 11 is further provided with a reserved anchor hole 1103, and the reserved anchor hole 1103 sequentially penetrates through the upper fixing assembly 1101, the horizontal elastic member 14 and the lower fixing assembly 1102 from top to bottom. Preferably, the upper fixture 1101 and the lower fixture 1102 are rigid members that are vertically symmetrical.
Example 3
Example 2 was repeated except that splice grooves 1104 were formed on all sides of the double-layered fixing member 11. The splice groove 1104 includes an upper groove 110401 and a lower groove 110402. The lower ends of all sides of the upper fixture 1101 are provided with upper grooves 110401. The upper ends of all sides of the lower fixing member 1102 are provided with lower grooves 110402. The upper groove 110401 of any one side of the upper fixture 1101 and the lower groove 110402 of the side of the lower fixture 1102 of the same side thereof together constitute a splice groove 1104.
Example 4
Example 3 is repeated except that a plurality of reserved fixing holes 1105 are provided on all sides of the double-layered fixing member 11. The reserved fixing holes 1105 are uniformly distributed around the splicing groove 1104.
Example 5
Example 4 was repeated, as shown in fig. 6, except that the multilayer connection member 12 had a double-layer structure. The dual layer connector 12 includes an upper connector assembly 1201 and a lower connector assembly 1202. The upper linkage assembly 1201 is disposed above the lower linkage assembly 1202 with a horizontal spring member 14 disposed in the overlap therebetween. Preferably, the upper and lower connection assemblies 1201, 1202 are rigid members that are vertically symmetrical.
Example 6
Embodiment 5 is repeated except that the upper connection assembly 1201 includes an upper connection plate 120101, an upper connection cylinder 120102, and an upper rib 120103. The upper connecting cylinder 120102 has an elongated cylindrical structure, and the upper connecting plate 120101 is provided at both front and rear ends of the upper connecting cylinder 120102. The upper rib 120103 is disposed at the connection between the upper connecting cylinder 120102 and the upper connecting plate 120101, and one end of the upper rib 120103 is fixed to the upper connecting cylinder 120102, and the other end is fixed to the upper connecting plate 120101.
Example 7
Embodiment 6 is repeated except that the lower connection assembly 1202 includes a lower connection plate 120201, a lower connection cylinder 120202, and a lower rib 120203. The lower connecting cylinder 120202 has an elongated cylindrical structure, and the lower connecting plates 120201 are provided at both front and rear ends of the lower connecting cylinder 120202. The lower rib 120203 is disposed at the connection between the lower connecting tube 120202 and the lower connecting plate 120201, and one end of the lower rib 120203 is fixed to the lower connecting tube 120202, and the other end is fixed to the lower connecting plate 120201.
Example 8
Example 7 was repeated except that the upper connecting plate 120101 and the lower connecting plate 120201 together constituted both end faces of the double-layered connecting member 12. A splicing protrusion 1203 is provided on one end face of the double-layer connector 12, and a reserved connection pin 1204 is provided on the other end face. The mating protrusion 1203 mates with the mating recess 1104.
Example 9
Embodiment 8 is repeated except that the splice tab 1203 includes an upper splice tab 120301 and a lower splice tab 120302. On one end face of the double-layered connecting member 12, the upper splice boss 120301 is provided at the lower end of the upper connecting plate 120101, and the lower splice boss 120302 is provided at the upper end of the lower connecting plate 120201. On the other end face of the double-layered connecting member 12, reserved connecting pegs 1204 are provided on both the upper connecting plate 120101 and the lower connecting plate 120201.
Example 10
Example 9 was repeated except that a plurality of reserved connection holes 1205 were provided on both end surfaces of the double-layered connector 12. The reserved connecting holes 1205 are uniformly distributed around the splicing protruding head 1203 and the reserved connecting studs 1204. Wherein, the reserved connection hole 1205 and the splicing protruding head 1203 positioned on the same end face correspond to the reserved fixing hole 1105.
Example 11
Example 10 is repeated as shown in fig. 7. Except that a plurality of layers of the fabricated beam member 13 are of a double-layered structure. The double-deck fabricated beam member 13 includes an upper beam assembly 1301 and a lower beam assembly 1302. The upper beam assembly 1301 is disposed above the lower beam assembly 1302 and a horizontal spring 14 is disposed at the overlap therebetween.
Example 12
Example 11 is repeated except that the double layer fabricated beam structure 13 further includes reserved rebar 1303. The reserved reinforcement 1303 includes an upper reinforcement 130301 and a lower reinforcement 130302. Both ends of the upper beam assembly 1301 are provided with a plurality of upper reinforcing bars 130301. Both ends of the lower beam assembly 1302 are provided with a plurality of lower reinforcing bars 130302. Reserved steel bars 1303 at either end of the assembled beam member 13 correspond to reserved connection holes 1205 on the end face of the connecting piece 12 provided with reserved connection pins 1204.
Example 13
Example 12 is repeated except that the ends of both the upper reinforcement bar 130301 and the lower reinforcement bar 130302 are provided with threads.
Example 14
Example 13 is repeated, as shown in fig. 8, except that the system further includes a vertical elastic member 15 vertically disposed in the middle of the fabricated beam member 13 in the length direction and dividing the fabricated beam member 13 into a left member 13A and a right member 13B. The vertical elastic member 15 and the horizontal elastic member 14 are vertically intersected and integrally formed into a whole.
Example 15
Example 14 is repeated except that the left member 13A includes an upper left member 1301A and a lower left member 1302A when the fabricated beam member 13 is of a double-layered structure. The right member 13B includes an upper right member 1301B and a lower right member 1302B. The vertical elastic member 15 and the horizontal elastic member 14 are integrally formed to form a cross-shaped elastic member which vertically intersects. The cross-shaped elastic member is positioned in the middle of the upper left member 1301A, the lower left member 1302A, the upper right member 1301B, and the lower right member 1302B.
Example 16
Example 15 is repeated as shown in fig. 1 except that the system further comprises a waterproofing geomembrane 3. The waterproof geomembrane 3 is arranged between the assembled frame grid beam 1 and the slope surface.
Example 17
Example 16 is repeated except that the system further comprises a drainage channel 4, said drainage channel 4 being provided at the top of the slope and/or at the bottom of the slope.
Example 18
Example 17 was repeated except that the horizontal elastic member 14 and the vertical elastic member 15 were each a high-strength elastic rubber sheet.
Example 19
Example 18 is repeated except that the fixing member 11 and the connecting member 12 are all rigid members made of steel.

Claims (13)

1. A lattice beam support system for expansive soil slope, its characterized in that: the system comprises an assembled frame grid beam (1) and an anchor rod (2); the assembled frame beam (1) comprises a fixing piece (11), a connecting piece (12) and an assembled beam member (13); the fixing pieces (11), the connecting pieces (12) and the assembled beam members (13) are all of multi-layer design in the direction vertical to the slope, and horizontal elastic pieces (14) are arranged among layers of the fixing pieces (11), among layers of the assembled beam members (13) and among layers of the connecting pieces (12); the multi-layer assembled beam member (13) is connected with the multi-layer fixing piece (11) through the multi-layer connecting piece (12) to form the multi-layer assembled frame beam (1); the anchor rods (2) anchor the plurality of layers of assembled frame beams (1) through the plurality of layers of fixing pieces (11);
The system also comprises a vertical elastic piece (15), wherein the vertical elastic piece (15) is vertically arranged in the middle of the assembled beam member (13) along the length direction and divides the assembled beam member (13) into a left member (13A) and a right member (13B); the vertical elastic piece (15) and the horizontal elastic piece (14) are vertically intersected and integrally formed into a whole;
the plurality of layers of fixing pieces (11) are of a double-layer structure; the double-layer fixing piece (11) comprises an upper fixing component (1101) and a lower fixing component (1102); the upper fixing assembly (1101) is arranged above the lower fixing assembly (1102), and a horizontal elastic piece (14) is arranged at the superposition position between the upper fixing assembly and the lower fixing assembly; the upper surface of the double-layer fixing piece (11) is also provided with a reserved anchor hole (1103), and the reserved anchor hole (1103) sequentially penetrates through the upper fixing component (1101), the horizontal elastic piece (14) and the lower fixing component (1102) from top to bottom; all side surfaces of the double-layer fixing piece (11) are provided with splicing grooves (1104);
the connecting piece (12) is of a double-layer structure; the double-layer connecting piece (12) comprises an upper connecting assembly (1201) and a lower connecting assembly (1202); the upper connecting assembly (1201) is arranged above the lower connecting assembly (1202), and a horizontal elastic piece (14) is arranged at the superposition position between the upper connecting assembly and the lower connecting assembly; the upper connecting assembly (1201) comprises an upper connecting plate (120101), an upper connecting cylinder (120102) and an upper rib (120103); the upper connecting cylinder (120102) is of a long cylindrical structure, and the upper connecting plate (120101) is arranged at the front end and the rear end of the upper connecting cylinder (120102); the lower connecting assembly (1202) comprises a lower connecting plate (120201), a lower connecting cylinder (120202) and lower ribs (120203); the lower connecting cylinder (120202) is of a long cylindrical structure, and the lower connecting plates (120201) are arranged at the front end and the rear end of the lower connecting cylinder (120202); the upper connecting plate (120101) and the lower connecting plate (120201) jointly form two end faces of the double-layer connecting piece (12); a splicing raised head (1203) is arranged on one end face of the double-layer connecting piece (12), and a reserved connecting bolt (1204) is arranged on the other end face of the double-layer connecting piece; the splicing convex head (1203) is matched with the splicing groove (1104);
The multi-layer assembled beam member (13) is of a double-layer structure; the double-layer fabricated beam member (13) comprises an upper beam assembly (1301) and a lower beam assembly (1302); the upper beam assembly (1301) is arranged above the lower beam assembly (1302), and a horizontal elastic piece (14) is arranged at the superposition position between the upper beam assembly and the lower beam assembly; the left member (13A) includes an upper left member (1301A) and a lower left member (1302A); the right member (13B) includes an upper right member (1301B) and a lower right member (1302B); the vertical elastic piece (15) and the horizontal elastic piece (14) are integrally formed to form a cross-shaped elastic piece which is vertically intersected; the cross-shaped elastic piece is positioned in the middle of the upper left component (1301A), the lower left component (1302A), the upper right component (1301B) and the lower right component (1302B);
the fixing piece (11) and the connecting piece (12) are all rigid members made of all steel materials.
2. The cellular beam support system for an expansive soil slope of claim 1, wherein: the upper (1101) and lower (1102) fixation assemblies are rigid members that are vertically symmetrical.
3. The cellular beam support system for an expansive soil slope of claim 2, wherein: the splice groove (1104) includes an upper groove (110401) and a lower groove (110402); the lower ends of all sides of the upper fixing assembly (1101) are provided with upper grooves (110401); the upper ends of all sides of the lower fixing component (1102) are provided with lower grooves (110402); the upper groove (110401) on any side of the upper fixing component (1101) and the lower groove (110402) on the side of the lower fixing component (1102) on the same side form a splicing groove (1104).
4. A lattice beam support system for expansive soil slopes as claimed in claim 3, wherein: all side surfaces of the double-layer fixing piece (11) are provided with a plurality of reserved fixing holes (1105); the reserved fixing holes (1105) are uniformly distributed around the splicing groove (1104).
5. The cellular beam support system for an expansive soil slope of claim 1, wherein: the upper (1201) and lower (1202) connection assemblies are rigid members that are vertically symmetrical.
6. The cellular beam support system for an expansive soil slope of claim 5, wherein: the upper rib (120103) is arranged at the joint of the upper connecting cylinder (120102) and the upper connecting plate (120101), one end of the upper rib (120103) is fixed on the upper connecting cylinder (120102), and the other end is fixed on the upper connecting plate (120101);
the lower rib (120203) is arranged at the joint of the lower connecting cylinder (120202) and the lower connecting plate (120201), one end of the lower rib (120203) is fixed on the lower connecting cylinder (120202), and the other end is fixed on the lower connecting plate (120201).
7. The cellular beam support system for an expansive soil slope of claim 6, wherein: the splicing protruding head (1203) comprises an upper splicing protruding head (120301) and a lower splicing protruding head (120302); on one end face of the double-layer connecting piece (12), the upper splicing protruding head (120301) is arranged at the lower end of the upper connecting plate (120101), and the lower splicing protruding head (120302) is arranged at the upper end of the lower connecting plate (120201); on the other end face of the double-layer connecting piece (12), reserved connecting bolts (1204) are arranged on the upper connecting plate (120101) and the lower connecting plate (120201).
8. The cellular beam support system for an expansive soil slope of claim 7, wherein: a plurality of reserved connecting holes (1205) are formed in the two end faces of the double-layer connecting piece (12); the reserved connecting holes (1205) are uniformly distributed around the splicing raised heads (1203) and the reserved connecting pegs (1204); wherein, the reserved connecting hole (1205) which is positioned on the same end face with the splicing protruding head (1203) corresponds to the reserved fixing hole (1105).
9. The cellular beam support system for an expansive soil slope of claim 8, wherein: the double-layer assembled beam member (13) also comprises reserved steel bars (1303); the reserved steel bars (1303) comprise upper steel bars (130301) and lower steel bars (130302); a plurality of upper steel bars (130301) are arranged at two ends of the upper beam assembly (1301); a plurality of lower reinforcing bars (130302) are arranged at two ends of the lower beam assembly (1302); the reserved steel bars (1303) at any end of the double-layer assembled beam member (13) correspond to reserved connecting holes (1205) on the end face of the reserved connecting studs (1204) arranged on the double-layer connecting piece (12).
10. The cellular beam support system for an expansive soil slope of claim 9, wherein: the ends of the upper reinforcing steel bar (130301) and the lower reinforcing steel bar (130302) are respectively provided with threads.
11. The cellular beam support system for an expansive soil slope of claim 1, wherein: the system also comprises a waterproof geomembrane (3); the waterproof geomembrane (3) is arranged between the assembled frame grid beam (1) and the slope surface; and/or
The system also comprises a drainage groove (4), wherein the drainage groove (4) is arranged at the top of the side slope and/or at the bottom of the side slope; and/or
The horizontal elastic piece (14) and the vertical elastic piece (15) are high-strength elastic rubber sheets.
12. A method of constructing a system as claimed in any one of claims 9 to 10, wherein: the method comprises the following steps:
1) Trimming and measuring the side slope to determine the installation hole site of the anchor rod (2);
2) Determining the specification of the assembled frame grid beam (1) according to the measurement data of the side slope;
3) Prefabricating a fixing piece (11), a connecting piece (12), an assembled beam component (13), a horizontal elastic piece (14) and a vertical elastic piece (15) to a factory according to the specification of the assembled frame grid beam (1); the double-layer connecting piece (12) and the double-layer assembled beam member (13) are connected in advance in layers through bolts in a factory, and exposed steel bars are poured through concrete to form a combined whole; the gap for installing the cross-shaped elastic piece is reserved on the whole of the poured combination, or the cross-shaped elastic piece, the double-layer connecting piece (12) and the double-layer assembled beam member (13) are poured in advance in a factory to form a combined whole; when the fixing piece (11) is prefabricated in a factory, an anchor hole (1103) is reserved in the fixing piece, and is filled with viscous substances in advance;
4) Placing fixing pieces (11) on the mounting hole sites of all the anchor rods (2) and enabling the reserved anchor holes (1103) to correspond to the mounting hole sites; and then connecting the fixing pieces (11) through the connecting pieces (12) and the assembled beam members (13) to form the assembled lattice beam (1) in a lattice shape, and finally fixing the fixing pieces (11) on an expansive soil slope after the anchor rods (2) pass through the reserved anchor holes (1103) of the fixing pieces (11), and simultaneously carrying out corrosion prevention treatment on the exposed rigid connecting parts.
13. The construction method according to claim 12, wherein: the method further comprises the steps of:
5) After determining the installation hole position of the anchor rod (2), punching the installation hole position to form a drill hole, grouting the drill hole, and finally fixing the anchor rod (2) in the grouted drill hole; and/or
6) Before the assembled frame beams (1) are installed, a waterproof geomembrane (3) is paved on the surface of a side slope; and/or
7) And pre-excavating drainage grooves (4) at the top and bottom of the side slope.
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