CN217974313U - Structure for enhancing lateral constraint force of composite foundation - Google Patents

Abstract

The utility model discloses a structure of reinforcing composite foundation side direction restraint, including crust layer, metalling, grid net, many reinforcers and divide left anchor roof beam and the right anchor roof beam of locating the composite foundation left and right sides. The hard shell layer is formed on the soft soil layer of the composite foundation, and the gravel layer is laid on the hard shell layer; the grid net comprises a plurality of longitudinal bars and a plurality of transverse bars, the longitudinal bars and the transverse bars are connected in a criss-cross mode, and the grid net is arranged in the gravel layer; the left anchoring beam and the right anchoring beam extend along the front-back direction, and the ends of the stretched transverse ribs are anchored on the left anchoring beam and/or the right anchoring beam. The reinforcement body penetrates through the upper layer of the gravel layer, the small lattices enclosed between the longitudinal ribs and the transverse ribs, the lower layer of the gravel layer, the hard shell layer and the soft soil layer. The longitudinal ribs and the transverse ribs have friction with the gravel layer and the reinforcing body, the gravel layer, the reinforcing body, the left anchoring beam and the right anchoring beam form a firm whole, and the lateral deformation resistance of the foundation is improved.

Description

Structure for enhancing lateral constraint force of composite foundation

Technical Field

The utility model relates to a road construction technical field, in particular to structure of compound ground side direction restraint of reinforcing.

Background

The composite foundation is a common roadbed or foundation treatment method in soft soil areas. For the existing composite foundation road, when development construction of lateral unloading is carried out on the road side by vacuum preloading treatment, foundation pit excavation and the like or heavy traffic exists, large lateral deformation piles can be generated at the edge of the composite foundation, so that the problems of pavement cracking, pipeline damage, pile breaking, embankment instability and the like can be caused. For the protection of the existing foundation, supporting structures such as cement soil mixing piles or reinforced concrete are generally constructed on the road side, but the former has the defects of low strength and rigidity, large slenderness ratio and insufficient lateral constraint force on the foundation, while the latter has high cost and long construction period, so that the protection of the composite foundation becomes an urgent problem to be solved in the road construction of soft foundation areas. Therefore, if the composite foundation structure with strong lateral constraint force can be adopted during foundation construction, the integrity of the composite foundation is enhanced, the lateral deformation of the composite foundation is reduced, and the problem of overlarge lateral deformation of the foundation can be avoided or alleviated during subsequent roadside development and construction.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a structure of reinforcing composite foundation side direction restraining force has higher side direction restraining force, and the wholeness of reinforcing composite foundation reduces composite foundation's lateral deformation.

According to the utility model discloses structure of reinforcing composite foundation side direction restraint power, including crust layer, metalling, grid net, many reinforcements and divide left anchor roof beam and the right anchor roof beam of locating the composite foundation left and right sides. The hard shell layer is formed on the soft soil layer of the composite foundation, the gravel layer is laid on the hard shell layer, and the embankment pavement is laid on the gravel layer. The grid net comprises a plurality of longitudinal bars and a plurality of transverse bars, the longitudinal bars and the transverse bars are connected in a criss-cross mode to form a grid shape, and the grid net is arranged in the gravel layer. Outside the both ends of horizontal muscle extended to the left and right sides of rubble layer respectively, left side anchor roof beam and right side anchor roof beam all extended along the fore-and-aft direction, many after the stretch-draw the end anchor of horizontal muscle is in left side anchor roof beam and/or on the right side anchor roof beam. The reinforcement body penetrates through the upper layer of the gravel layer, the small lattices enclosed by the longitudinal ribs and the transverse ribs, the lower layer of the gravel layer, the hard shell layer and the soft soil layer.

The method has the following beneficial effects: the grid mesh is positioned in the gravel layer, the upper surface and the lower surface of the grid mesh generate a larger friction effect with the gravel, and the gravel generates a resistance effect on the longitudinal bars and the transverse bars. The grid net is sleeved on the reinforcements, and the longitudinal ribs, the transverse ribs and the reinforcements form mechanical connection, so that the displacement of relative distance between the reinforcements, particularly between the reinforcement in the middle of the composite foundation and the reinforcement at the edge of the composite foundation, is limited; after the grid net is stretched, the transverse ribs are anchored on the left anchoring beam and/or the right anchoring beam, so that the grid net, the gravel layer, the reinforcement body, the left anchoring beam and the right anchoring beam form a firm whole. The broken stone layer with good drainage accelerates the consolidation of the soft soil layer below, so that the strength, rigidity and thickness of the hard shell layer are increased, and the bearing capacity and the lateral deformation resistance of the foundation are further improved.

According to some embodiments of the utility model, the geogrid net is two-way high strength steel-plastic geosynthetic grid, the ultimate pulling force of grid net is more than or equal to 100kN/m, and the elongation is less than or equal to 3%.

According to some embodiments of the utility model, the thickness of rubble layer is 0.2m ~ 0.6m, the rubble layer adopts the grade of texture hard to divide the rubble, and maximum particle size is less than or equal to 50mm.

According to some embodiments of the utility model, left side anchor roof beam set up in the leftmost side the left side of reinforcement, be equipped with a plurality of running through on the left side anchor roof beam the connecting hole of side about the left side anchor roof beam, the left end of horizontal muscle is passed the connecting hole is connected with the connecting block, the side of connecting block is supported on the left surface of left side anchor roof beam.

According to the utility model discloses a some embodiments, the left end of horizontal muscle is equipped with the external screw thread, the connecting block is the nut, the internal thread of nut with the external screw thread is mutually supported.

According to some embodiments of the invention, the longitudinal bars are adjacent to each other, and the transverse bars are adjacent to each other.

According to some embodiments of the invention, the distance between the pile top of the reinforcement and the grid mesh is 0.5m to 1.0m.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention is further described with reference to the following figures and examples, in which:

fig. 1 is a schematic view of a structure for enhancing lateral restraining force of a composite foundation according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a grid net and a reinforcement in a structure for enhancing lateral restraining force of a composite foundation according to an embodiment of the present invention;

fig. 3 is the embodiment of the utility model discloses a structural schematic diagram of the left anchoring beam in the structure of reinforcing composite foundation side direction restraining force.

Reference numbers: the hard shell layer 100, the gravel layer 200, the grid mesh 300, the longitudinal ribs 310, the transverse ribs 320, the left anchoring beam 400, the connecting holes 410, the right anchoring beam 500 and the reinforcement body 600.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the directional descriptions, such as the directions or positional relationships indicated by upper, lower, front, rear, left, right, etc., are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but not for indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.

In the description of the present invention, a plurality means two or more. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 and 2, the present invention discloses a structure for enhancing lateral restraint force of a composite foundation, which comprises a hard shell layer 100, a gravel layer 200, a grid net 300, a plurality of reinforcements 600, and a left anchoring beam 400 and a right anchoring beam 500 respectively disposed at the left and right sides of the composite foundation. The hard shell layer 100 is formed on the soft soil layer of the composite foundation, the crushed stone layer 200 is laid on the hard shell layer 100, and the embankment pavement is laid on the crushed stone layer 200. The grid net 300 includes a plurality of longitudinal ribs 310 and a plurality of transverse ribs 320, the longitudinal ribs 310 and the transverse ribs 320 are criss-crossed to form a grid shape, and the grid net 300 is disposed in the crushed stone layer 200. Both ends of the transverse ribs 320 extend to the outside of the left side and the right side of the gravel layer 200 respectively, the left anchoring beam 400 and the right anchoring beam 500 both extend in the front-back direction, and the ends of the plurality of tensioned transverse ribs 320 are anchored on the left anchoring beam 400 and/or the right anchoring beam 500. The reinforcement 600 penetrates through the upper layer of the crushed stone layer 200, the small lattices enclosed between the longitudinal ribs 310 and the transverse ribs 320, the lower layer of the crushed stone layer 200, the hard shell layer 100 and the soft soil layer.

Because the reinforcement 600 passes through the cells enclosed between the longitudinal ribs 310 and the transverse ribs 320, the longitudinal ribs 310 and the transverse ribs 320 are connected in a criss-cross manner and are positioned in the gravel layer 200, and the ends of the transverse ribs 320 are connected with the left anchoring beam 400 and/or the right anchoring beam 500, the longitudinal ribs 310 and the transverse ribs 320 have friction with the gravel layer 200 and the reinforcement 600, the longitudinal ribs 310 and the transverse ribs 320 play a role of pulling ribs, and the gravel layer 200, the reinforcement 600, the left anchoring beam 400 and the right anchoring beam 500 form a firm whole, so that the structure has higher lateral constraint force, the strength and the rigidity are both larger, and the stability of the composite foundation is improved. The crushed stone layer 200 also has good drainage performance, which is beneficial to the drainage and dry hardening of the whole composite foundation.

The structure for enhancing the lateral constraint force of the composite foundation not only plays the role of traditional reinforced soil interaction, but also plays the role of limiting the mechanical connection of the grid net 300, the reinforcement body 600 and the anchoring beam. The grid net 300 is arranged in the gravel layer 200, the upper surface and the lower surface of the grid net 300 generate a larger friction effect with the gravel, the grid formed by the longitudinal ribs 310 and the transverse ribs 320 generates an effect of fixing the gravel, and the gravel generates an impedance effect on the longitudinal ribs 310 and the transverse ribs 320. By sleeving the grid net 300 on the reinforcements 600, the longitudinal ribs 310 and the transverse ribs 320 are mechanically connected with the reinforcements 600, so that the displacement of relative distance between the reinforcements 600, particularly between the reinforcements 600 in the middle of the composite foundation and the reinforcements 600 at the edges of the composite foundation is limited; after the grid net 300 is tensioned, the transverse ribs 320 are anchored on the left anchoring beam 400 and/or the right anchoring beam 500, and the edge reinforcement body 600 is dragged by the left anchoring beam 400 and/or the right anchoring beam 500 towards the inside of the foundation, so that the grid net 300, the gravel layer 200, the reinforcement body 600, the left anchoring beam 400 and the right anchoring beam 500 form a firm whole. The crushed stone layer 200 having good water drainage accelerates consolidation of the soft soil layer below, so that the strength, rigidity and thickness of the hard shell layer 100 are increased, and the bearing capacity and lateral deformation resistance of the foundation are further improved.

It can be known that the pile top of the reinforcement 600 is parallel to or higher than the upper surface of the gravel layer 200, the length of the reinforcement 600 is long enough, the specific length of the reinforcement 600 is determined according to the thickness of the soft soil layer, the lower end of the reinforcement 600 passes down through the soft soil layer and extends to the harder soil layer below the soft soil layer, and the harder soil layer is the pile end supporting layer. The reinforcement 600 may be one or more of a cement mixing pile, a CFG pile, a PHC pile, a jet grouting pile, and a rammed cement pile.

The hard shell layer 100 is a soil layer with high strength and modulus formed by leveling and filling soil in a composite foundation field or solidifying a soft soil layer below the composite foundation field. Its thickness and strength are related to the properties of the flat or soft fill, the properties of the ballast under drainage conditions, and the consolidation time.

Of course, in the composite foundation, the arrangement of the left anchoring beam 400 and the right anchoring beam 500 may be set according to engineering requirements, one or both of the left anchoring beam 400 and the right anchoring beam 500 may be set, and when only one side of the anchoring beam is set, the grid mesh 300 does not span the whole foundation width, but is only arranged in a certain width range of the foundation on the corresponding side; when the anchoring beams are arranged on both sides of the composite foundation, the grid net 300 can transversely span the whole width of the foundation, or the grid net 300 can be arranged only in a certain width range on both sides of the foundation. The crushed stone layer 200, the grid net 300, the left anchoring beam 400 and the right anchoring beam 500 may be provided in two or more layers in the depth direction of the foundation, resulting in a firmer foundation.

The construction steps of the composite foundation are as follows, after filling field flat filling on a soft soil layer, the reinforcement body 600 is constructed; reversely digging a pit with a certain depth downwards to expose the upper end of the reinforcement body 600; paving broken stones in the pit groove to form a broken stone layer 200 lower layer with a certain thickness; laying a grid net 300 on the lower layer of the crushed stone layer 200, and cutting at the reinforcing bodies 600 to enable the grid net 300 to be sleeved on the reinforcing bodies 600 or enable the reinforcing bodies 600 to be positioned in small lattices formed on the grid net 300; paving broken stones on the grid net 300 to form an upper layer of a broken stone layer 200 with a certain thickness; after a hard shell layer 100 with a certain thickness is formed below the gravel layer 200, construction of the left anchoring beam 400 and/or the right anchoring beam 500 is carried out, the left anchoring beam 400 and/or the right anchoring beam 500 can be obtained by adopting a field construction or prefabrication mode, a transverse bar 320 to be used for anchoring penetrates through the left anchoring beam 400 and/or the right anchoring beam 500 in advance during construction, pretension is applied to the transverse bar 320, and then the end of the transverse bar 320 is connected with the left anchoring beam 400 and/or the right anchoring beam 500; finally, embankment pavement construction is carried out

It can be understood that, the distances between two adjacent longitudinal bars 310 and between two adjacent transverse bars 320 are smaller than or equal to the diameter of the reinforcement 600, so that the longitudinal bars 310 and the transverse bars 320 are supported on the reinforcement 600, the friction traction force between the reinforcement 600 and the longitudinal bars 310 and between the reinforcement 600 and the transverse bars 320 is larger, and the foundation has a larger lateral restraining force.

It is appreciated that the longitudinal ribs 310 and the transverse ribs 320 may be bar-shaped or rod-shaped. The ultimate tensile force of the longitudinal ribs 310 and the transverse ribs 320 is not less than 100kN/m, and the elongation is not more than 3%.

It is conceivable that, when the transverse rib 320 is connected to the left anchoring beam 400 and the right anchoring beam 500, the entire grid net 300 may be in a tensioned state by applying a pre-stress to the transverse rib 320, the active constraint effect of the grid net 300 on the reinforcement member 600 is enhanced by a pre-stress technique, and the initial strain of the grid net 300 is eliminated, so that the composite foundation may have a stronger integrity and a smaller deformation. Of course, when the prestress loss is large, the grid net 300 may be tensioned as needed.

It is understood that the grill net 300 is a net shape, and the grill net 300 is fitted over the reinforcement member 600. The longitudinal ribs 310 and the transverse ribs 320 may be made of one of a plastic geosynthetic material, a bidirectional tensile high-strength steel-plastic geosynthetic material, a glass fiber geosynthetic material, and a polyester geosynthetic material, that is, the grill net 300 is made of a geosynthetic material. Conventional earth materials provide tension and resist deformation through reinforcement and soil friction. The geosynthetic material of this embodiment has both the conventional reinforcement interaction with the crushed stone of the crushed stone layer 200, such as friction, fixation, and resistance, and the limiting function of mechanical connection with the reinforcement member 600 and the left and right anchoring beams 400 and 500, and when the geosynthetic material has sufficient rigidity and strength, the limiting resistance provided by this connection is much greater than the resistance provided by the reinforcement interaction with the conventional geosynthetic material.

It can be understood that the thickness of the crushed stone layer 200 is 0.2 m-0.6 m, the hard graded crushed stones are adopted, the maximum grain size is less than or equal to 50mm, so that the crushed stone layer 200 is compact and has excellent drainage performance, the thickness of the crushed stone layer 200 is not more than the depth of the anti-excavation pit groove, and the top surface of the upper layer of the crushed stone layer 200 can be backfilled with compacted earth filling meeting the specification requirement to the composite foundation working surface.

Referring to fig. 3, the left anchoring beam 400 is provided with a plurality of connecting holes 410 penetrating through left and right sides of the left anchoring beam 400, the left end of the transverse rib 320 penetrates through the connecting holes 410 and is connected with a connecting block, and the side of the connecting block abuts against the left side of the left anchoring beam 400. When the left end of the transverse rib 320 is connected to the left anchoring beam 400, the left end of the transverse rib 320 is first inserted into the connecting hole 410, and then the left end of the transverse rib 320 is connected to the upper connecting block. The left end of the transverse rib 320 can be detachably connected with the connecting block.

It can be understood that the left end of the transverse rib 320 is provided with an external thread, the connecting block is a nut, the internal thread and the external thread of the nut are matched with each other, and the transverse rib 320 can be tensioned or loosened by screwing the connecting block, so that the transverse rib 320 and the left anchoring beam 400 can be conveniently connected, tensioned and disassembled.

It is to be understood that the connection mechanism and connection manner of the right end of the transverse bar 320 to the right anchoring beam 500 and the connection mechanism and connection manner of the left end of the transverse bar 320 to the left anchoring beam 400 are the same or similar, and redundant description is omitted here.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims (7)

1. Structure of reinforcing composite ground side direction restraint power, its characterized in that includes:

a hard shell layer formed on a soft soil layer of the composite foundation;

the broken stone layer is laid on the hard shell layer;

the grating net comprises a plurality of longitudinal ribs and a plurality of transverse ribs, the longitudinal ribs and the transverse ribs are connected in a criss-cross mode, and the grating net is arranged in the gravel layer;

the left anchoring beam and the right anchoring beam extend along the front-back direction, and the ends of the plurality of stretched transverse ribs are anchored on the left anchoring beam and/or the right anchoring beam;

the reinforcing bodies penetrate through the upper layer of the gravel layer, the small lattices formed by the enclosure of the longitudinal ribs and the transverse ribs, the lower layer of the gravel layer, the hard shell layer and the soft soil layer.

2. A structure for enhancing lateral restraining force of a composite foundation as defined in claim 1, wherein: the grid net is a bidirectional high-strength steel-plastic geosynthetic grid, the ultimate tensile force of the grid net is greater than or equal to 100kN/m, and the elongation is less than or equal to 3%.

3. A structure for enhancing lateral restraining force of a composite foundation as defined in claim 1, wherein: the thickness of the gravel layer is 0.2-0.6 m, the gravel layer is made of hard graded gravel, and the maximum grain size is less than or equal to 50mm.

4. A structure for enhancing lateral restraining force of a composite foundation as defined in claim 1, wherein: the left side anchor roof beam set up in the leftmost side the left side of reinforcement, be equipped with a plurality of running through on the left side anchor roof beam the connecting hole of side about the left side anchor roof beam, the left end of horizontal muscle passes the connecting hole is connected with the connecting block, the side of connecting block supports on the left surface of left side anchor roof beam.

5. The structure for enhancing the lateral restraining force of a composite foundation as claimed in claim 4, wherein: the left end of horizontal muscle end is equipped with the external screw thread, the connecting block is the nut, the internal thread of nut with the external screw thread is mutually supported.

6. A structure for enhancing lateral restraining force of a composite foundation as defined in claim 1, wherein: the distance between two adjacent longitudinal ribs and the distance between two adjacent transverse ribs are smaller than or equal to the diameter of the reinforcement body.

7. A structure for enhancing lateral restraining force of a composite foundation as defined in claim 1, wherein: the distance between the pile top of the reinforcement body and the grid net is 0.5-1.0 m.

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