CN214328887U - Assembled foundation pit inner supporting structure convenient to disassemble - Google Patents

Abstract

The utility model belongs to the technical field of underground foundation pit engineering, in particular to an easy-to-disassemble assembly type foundation pit inner support structure, which comprises an enclosure structure and an assembly type support; the top of the enclosure structure is provided with a crown beam, the inner side of the enclosure structure is provided with a waist beam, and the assembled supports are supported between two opposite sides of the crown beam and between two opposite sides of the waist beam; the assembled support is formed by splicing a plurality of prefabricated support sections, and a disassembly gasket is arranged between at least two adjacent prefabricated support sections. The utility model discloses a set up between two at least adjacent prefabricated support segments in the assembled support and dismantle the gasket to can demolish earlier when dismantling and dismantle the gasket, eliminate the axle power between prefabricated support segment, reduce the degree of difficulty that prefabricated support segment was dismantled, improve the dismantlement efficiency that the assembled supported.

Description

Assembled foundation pit inner supporting structure convenient to disassemble

Technical Field

The utility model belongs to the technical field of underground foundation ditch engineering, concretely relates to supporting structure in assembled foundation ditch convenient to dismantle.

Background

Traditional cast in situ concrete supports, because of its rigidity is big, the wholeness is good, advantages such as safe and reliable, generally apply to underground works, nevertheless also have outstanding problem and shortcoming: (1) cost, high investment: concrete support belongs to temporary engineering, a main body of a station structure is finished, namely outward transportation is broken, the investment of temporary waste engineering is high, generally, underground stations are millions, complex stations are tens of millions, and the cost of complex stations is tens of millions; (2) time-consuming and long construction period: supporting a formwork by concrete, binding reinforcing steel bars, pouring and vibrating, maintaining and removing at the later stage, wherein the whole process is long for several months, and the site construction progress is seriously restricted; (3) hard, the degree of difficulty is big: the concrete support construction difficulty is high, and a large amount of manpower and material resources are consumed to break the construction after the use; (4) the concrete is not environment-friendly, the waste residues of the concrete are broken to pollute the environment, and the development direction of green construction, environmental protection and energy conservation is not met. Advanced products and scientific construction methods are urgently needed to replace the traditional concrete support.

At present, when the assembly type support is disassembled, because the support usually bears larger pressure and has longer length, the assembly type support with the length of several meters still has great difficulty in disassembling after bolts among prefabricated support sections are unscrewed under huge pressure stress. And traditional steel pipe props and to be retrieved, and the construction is comparatively convenient, but can only bear pressure between its and foundation ditch retaining structure, and the wholeness is relatively poor, and anti deformability is poor, becomes the weak link of foundation ditch safety.

Disclosure of Invention

In order to overcome the not enough of above-mentioned prior art existence, the utility model aims at providing an assembly type foundation ditch inner supporting structure convenient to dismantle reduces the degree of difficulty that prefabricated support segment section dismantled, improves the dismantlement efficiency that the assembly type supported.

In order to achieve the purpose, the technical scheme of the utility model is an easy-to-disassemble fabricated foundation pit inner supporting structure, which comprises an enclosure structure and a fabricated support; the top of the enclosure structure is provided with a crown beam, the inner side of the enclosure structure is provided with a waist beam, and the assembled supports are supported between two opposite sides of the crown beam and between two opposite sides of the waist beam; the assembled support is formed by splicing a plurality of prefabricated support sections, and a disassembly gasket is arranged between at least two adjacent prefabricated support sections.

Further, the prefabricated support section comprises a steel pipe, an inner ring plate and an outer ring plate; the end faces of two ends of the steel pipe are welded with inner ring plates, and the outer walls of two ends of the steel pipe are welded with outer ring plates in an annular mode; the inner ring plate and the outer ring plate which are positioned at the same end of the steel pipe are connected through a stiffening rib, and the stiffening rib is welded with the steel pipe; a plurality of screw holes are formed in the inner ring plate and the outer ring plate at intervals in the circumferential direction, and the screw holes in the outer ring plate correspond to the screw holes in the inner ring plate one by one; and corresponding screw holes on the inner ring plate and the outer ring plate on the adjacent prefabricated support sections are respectively provided with a screw and are fixed through nuts.

Furthermore, a plurality of screw holes are formed in the disassembling gasket, and the screw holes in the disassembling gasket are in one-to-one correspondence with the screw holes in the outer ring plate and the screw holes in the inner ring plate; and the screw rod penetrates through a corresponding screw rod hole in the disassembling gasket.

Furthermore, filling concrete is poured in the steel pipe, and a hollow part which penetrates through the filling concrete along the axial direction is formed in the filling concrete; the terminal surface at steel pipe both ends all welds the shrouding, interior crown plate welds in deviate from on the shrouding on the one side of steel pipe.

Furthermore, the sealing plate, the inner ring plate and the outer ring plate are all annular, the size of the inner ring of the sealing plate and the size of the inner ring plate are both the same as the size of the hollow part filled with concrete, and the size of the inner ring of the outer ring plate is the same as the size of the outer ring of the steel pipe.

Furthermore, a plurality of circumferential stirrups and a plurality of longitudinal reinforcements are arranged in the filling concrete, the circumferential stirrups are arranged at intervals along the supporting direction, the longitudinal reinforcements are arranged at intervals along the inner sides of the circumferential stirrups, the longitudinal reinforcements are connected with the circumferential stirrups, and two ends of the longitudinal reinforcements are connected with the sealing plates at two ends of the steel pipe through perforated plug welding respectively.

Furthermore, a plurality of stiffening ribs are arranged between the inner ring plate and the outer ring plate at intervals along the circumferential direction, and the stiffening ribs and the screw rods are arranged at intervals.

Furthermore, the stiffening rib is a chamfered rectangular steel plate, and two corners of the side edge connected with the steel pipe on the stiffening rib are chamfers.

Furthermore, embedded parts are embedded in the crown beam and the waist beam, and each embedded part comprises an embedded steel plate and a plurality of embedded screws; one ends of the embedded screws respectively penetrate through the embedded steel plates in sequence, and the other ends of the embedded screws extend out of the crown beam or the waist beam and respectively penetrate through the plurality of screw holes in the inner ring plate and the plurality of screw holes in the outer ring plate at the end part of the assembled support in sequence and then are fixed through nuts.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) the utility model discloses a set up the dismantlement gasket between at least certain two adjacent prefabricated support segments in the assembled support to can demolish the dismantlement gasket earlier when dismantling, eliminate the axial force between the prefabricated support segment, reduce the degree of difficulty that the prefabricated support segment was dismantled, improve the dismantlement efficiency of assembled support;

(2) the utility model discloses a prefabricated support segment section is connected through many screws, ensures the rigid connection of middle node, realizes that the node is strong such as with the component, guarantees the safety and stability of foundation ditch engineering, and the installation is convenient with the dismantlement, and the batch production preparation of being convenient for and large tracts of land are popularized and applied.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a plan view of an easy-to-disassemble fabricated foundation pit inner supporting structure provided in an embodiment of the present invention;

fig. 2 is a longitudinal sectional view of a prefabricated support section provided by an embodiment of the present invention;

fig. 3 is a cross-sectional view of a prefabricated support segment when a steel pipe provided by an embodiment of the present invention is circular;

fig. 4 is a cross-sectional view of a prefabricated support segment when a steel pipe provided by an embodiment of the present invention is square;

fig. 5 is a longitudinal sectional view (without a removable spacer) of a connection node structure of a prefabricated support segment according to an embodiment of the present invention;

fig. 6 is a longitudinal sectional view (with a detachable spacer) of a connection node structure of a prefabricated support segment according to an embodiment of the present invention;

fig. 7 is a cross-sectional view of a connection node structure of a prefabricated support segment according to an embodiment of the present invention;

fig. 8 is a schematic view of an inner ring plate when the steel pipe provided by the embodiment of the present invention is circular;

fig. 9 is a schematic view of an outer ring plate when the steel pipe provided by the embodiment of the present invention is circular;

FIG. 10 is a schematic view of a stiffener according to an embodiment of the present invention;

fig. 11 is a schematic view of a removable gasket according to an embodiment of the present invention;

fig. 12 is a schematic view illustrating a connection between a prefabricated support section and a crown beam according to an embodiment of the present invention;

fig. 13 is a schematic view of an embedded part provided in an embodiment of the present invention;

fig. 14 is a cross-sectional view of a support according to an embodiment of the present invention;

fig. 15 is a top view of a support according to an embodiment of the present invention;

in the figure: 1. an enclosure structure; 2. a crown beam; 3. prefabricating a support segment; 4. embedding parts; 5. pre-burying a steel plate; 6. pre-burying a screw; 7. a support; 8. an outer ring plate; 9. a stiffening rib; 10. an inner ring plate; 11. a steel pipe; 12. hooping; 13. longitudinal ribs; 14. closing the plate; 15. plug welding of the through hole; 16. filling concrete; 17. a screw; 18. a nut; 19. a screw hole; 20. disassembling the gasket; 21. concave steel blocks; 22. steel legs; 23. a concrete base.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Example one

As shown in fig. 1 and 6, the present embodiment provides an easy-to-disassemble fabricated foundation pit inner support structure, which includes a building envelope 1 and a fabricated support; the top of the enclosure structure 1 is provided with a crown beam 2, the inner side of the enclosure structure 1 is provided with a waist beam, and the assembled supports are supported between two opposite sides of the crown beam 2 and between two opposite sides of the waist beam; the fabricated support is formed by splicing a plurality of prefabricated support sections 3, and a disassembly gasket 20 is arranged between at least two adjacent prefabricated support sections 3. The assembled support of this embodiment is equipped with a dismantlement gasket 20 in at least, through placing dismantlement gasket 20 between two of them prefabricated support sections 3 to can demolish dismantlement gasket 20 earlier when dismantling, eliminate the axle power between prefabricated support sections 3, all the other prefabricated support sections 3 alright with easily demolish, effectively solve the problem of the long assembled support of several meters and dismantle the difficulty, improve the dismantlement efficiency that the assembled supported.

In this embodiment, the removable spacer 20 may be a solid steel ring with a thickness of 3-10cm, or a solid steel ring formed by splicing multiple segments, such as two semicircular steel rings or multiple fan-shaped steel rings, and the multiple segments of steel rings are not connected; the surface of the disassembly gasket 20 needs to be smooth, a layer of lubricant can be coated on the two side surfaces of the disassembly gasket 20 before installation, the difficulty in disassembling the disassembly gasket 20 is much smaller, once the disassembly gasket 20 is disassembled, the axial force among the prefabricated support sections 3 disappears, and the rest prefabricated support sections 3 can be easily disassembled. The drawings of the present embodiment are explained taking the crown beam 2 as an example, and the case of the wale refers to the crown beam 2.

The prefabricated support section 3 of this embodiment may be supported by concrete-filled hollow steel tubes, as shown in fig. 3 and 4, or by pure steel supports and pure concrete supports, or by high-strength alloy steel materials or combined materials with concrete; the prefabricated support sections 3 can be designed with a plurality of fixed module sections with proper lengths according to requirements, and are not suitable for overlong, hoisting construction is not suitable for overlong, and joints are too many and difficult to connect due to too short length; as an implementation mode, the prefabricated support sections 3 can be designed with standard modules of 4m, 5m, 6m and the like and end section modules of 2m, and the prefabricated support sections 3 with completely the same, incompletely the same or completely different length specifications are selected for assembly according to actual foundation pit requirements, so that the requirements of foundation pit supports with different widths and lengths are met, and the universal applicability is realized.

As an embodiment, the prefabricated support segment 3 comprises a steel tube 11, an inner ring plate 10 and an outer ring plate 8; inner ring plates 10 are welded on the end faces of two ends of the steel pipe 11, and outer ring plates 8 are welded on the outer walls of two ends of the steel pipe 11 in an annular mode; the inner ring plate 10 and the outer ring plate 8 which are positioned at the same end of the steel pipe 11 are connected 9 through a stiffening rib, and the stiffening rib 9 is welded with the steel pipe 11; a plurality of screw holes 19 are formed in the inner ring plate 10 and the outer ring plate 8 at intervals along the circumferential direction, and the screw holes 19 in the outer ring plate 8 correspond to the screw holes 19 in the inner ring plate 10 one by one; the corresponding screw holes 19 on the inner ring plate 10 and the outer ring plate 8 on the adjacent prefabricated support sections 3 are respectively provided with screws 17 and fixed through nuts 18. As shown in fig. 5 and 6, the inner ring plate 10, the stiffening ribs 9 and the outer ring plate 8 at the end of the steel pipe 11 form a boot beam node to increase the rigidity of the joint, wherein the outer ring plate 8 is welded to the steel pipe 11 in a circumferential direction, the inner side of the outer ring plate 8 is welded to the stiffening ribs 9, the inner side of the inner ring plate 10 is respectively welded to the stiffening ribs 9, the steel pipe 11 and the sealing plate 14, and three sides of the stiffening ribs 9 are respectively welded to the outer ring plate 8, the inner ring plate 10 and the steel pipe 11 to ensure the rigidity of the joint at the joint; the boot beam nodes at the end parts of the prefabricated support sections 3 are connected through the plurality of screw rods 17, so that the rigid connection of the middle nodes is ensured, the equal strength of the nodes and components is realized, the assembled support is ensured to reach the strength and rigidity similar to or even higher than those of cast-in-place concrete support, the safety and stability of foundation pit engineering are ensured, the assembly and disassembly are convenient, and the factory production and large-area popularization and application are facilitated; during splicing, a plurality of screw holes 19 on two prefabricated support sections 3 are respectively aligned, then screws 17 are installed in the screw holes 19 on the same straight line and are fixed through nuts 18, and splicing between the prefabricated support sections 3 is achieved.

Furthermore, a plurality of screw holes 19 are formed in the disassembly gasket 20, and the screw holes 19 in the disassembly gasket 20 correspond to the screw holes 19 in the outer ring plate 8 and the screw holes 19 in the inner ring plate 10 one by one; the screw 17 passes through a corresponding screw hole 19 on the removal gasket 20. As shown in fig. 6 and 11, the size of the removing shim 20 in this embodiment may be the same as that of the inner ring plate 10, a plurality of screw holes 19 are uniformly arranged along the circumferential direction on the outer edge, and the screw holes 19 on the removing shim 20 correspond to the screw holes 19 on the inner ring plate 10 and the outer ring plate 8 of the prefabricated support segment 3 one by one.

As another embodiment, on the basis of the prefabricated support section 3 of the steel structure, filling concrete 16 is poured into the steel pipe 11, and a hollow part penetrating along the axial direction is formed in the filling concrete 16; seal plates 14 are welded to the end faces of two ends of the steel pipe 11, and the inner ring plate 10 is welded to one face, deviating from the steel pipe 11, of the seal plate 14. In the embodiment, the filling concrete 16 is poured in the steel pipe 11 to form a hollow structure, so that the advantages of two materials of the steel pipe 11 and the concrete can be fully exerted, the cost performance is high, the weight and the strength are light, the recycling, the transportation and the installation are convenient, and compared with a pure steel support, the hollow steel pipe 11 has obvious economic benefit, and compared with a concrete support, the rigidity is higher, the steel pipe 11 is an outer skin of a prefabricated support, so that the internal filling concrete 16 can be protected from being damaged, the repeated recycling of a prefabricated part is realized, meanwhile, the bearing capacity of the filling concrete can be obviously improved under the hoop effect of the steel pipe 11, the bearing capacity (strength) of the concrete support of the hollow steel pipe 11 is high, the deformation resistance (rigidity) is high, the same as or even higher strength and rigidity of the conventional concrete support can be achieved, and the engineering safety of a foundation pit is ensured; and the hollow parts of the prefabricated support segments 3 of the assembled support are communicated, so that the assembled support has higher bearing capacity and stronger deformation resistance.

In this embodiment, the cross section of the steel pipe 11 may be circular, square, rectangular, polygonal, or the like, may be made of high-strength steel, may be made of alloy steel, or the like, satisfies the stress, and is easy to weld. In this embodiment, the filling concrete 16 may be high strength concrete, lightweight concrete or foam concrete, and the strength needs to meet the design requirement; the filling concrete 16 is hollow and can be formed by a centrifugal process or other processes, the thickness of the filling concrete 16 is about 100mm-200mm, and a small value is preferably adopted under the condition of meeting the supporting rigidity so as to reduce the self weight of the prefabricated part; the hollow part of the filling concrete 16 can be not provided with any inner wall, or can be in the form of an inner wall, the inner wall can be made of steel pipes, PVC and the like, the cross section of the inner wall is not limited to be circular, and can also be in various shapes such as square, polygon and the like, and the closing plate 14 can protect the filling concrete 16 at the end part; the closing plate 14, the inner ring plate 10, the outer ring plate 8, the stiffening ribs 9 and the steel pipes 11 can be prefabricated into a whole or can be prefabricated separately and then welded into a whole.

Furthermore, the sealing plate 14, the inner ring plate 10 and the outer ring plate 8 are all ring-shaped, and the inner ring size of the sealing plate 14 and the inner ring size of the inner ring plate 10 are all the same as the size of the hollow part of the filling concrete 16, and the inner ring size of the outer ring plate 8 is the same as the size of the outer ring of the steel pipe 11. The shapes and the sizes of the closing plate 14, the inner ring plate 10 and the outer ring plate 8 are matched with those of the steel pipe 11 in the embodiment; when the steel pipe 11 is circular, the closing plate 14, the inner ring plate 10 and the outer ring plate 8 are all circular steel plates, as shown in fig. 3, 8 and 9, wherein the inner diameter of the outer ring plate 8 is the same as the outer diameter of the steel pipe 11, the inner diameter of the inner ring plate 10 and the inner diameter of the closing plate 14 are both the same as the inner diameter of the hollow part filled with concrete 16, the outer diameter of the closing plate 14 may be the same as the outer diameter of the steel pipe 11, and the outer diameter of the inner ring plate 10 may be the same as the outer diameter of the outer ring plate 8; when the steel pipe 11 is square, as shown in fig. 4, the closing plate 14, the inner ring plate 10 and the outer ring plate 8 are square ring-shaped steel plates, and the inner ring size and/or the outer ring size of the closing plate 14, the inner ring plate 10 and the outer ring plate 8 are adjusted accordingly, and will not be described in detail herein.

Furthermore, a plurality of circumferential stirrups 12 and a plurality of longitudinal reinforcements 13 are configured in the filling concrete 16, the circumferential stirrups 12 are arranged at intervals along the supporting direction, the longitudinal reinforcements 13 are arranged at intervals along the inner sides of the circumferential stirrups 12, each longitudinal reinforcement 13 is connected with the circumferential stirrups 12, and two ends of each longitudinal reinforcement 13 are connected with the sealing plates 14 at two ends of the steel pipe 11 through the perforated plug welds 15. As shown in fig. 2-4, a plurality of longitudinal bars 13 are disposed in the filling concrete 16 of this embodiment along the supporting direction, and the longitudinal bars 13 are uniformly disposed at the inner sides of the circumferential stirrups 12 and connected to the circumferential stirrups 12, so as to enhance the tight connection effect between the concrete and the steel tube 11, so as to ensure that the steel tube 11 and the concrete work together effectively, and the rigidity of the concrete is higher and far exceeds the concrete support of the concrete size; the diameters and the arrangement numbers of the longitudinal ribs 13 and the circumferential stirrups 12 can be determined according to actual conditions, and the longitudinal ribs and the circumferential stirrups can be arranged in the middle of the filling concrete 16; two ends of the longitudinal rib 13 are respectively welded with the sealing plates 14 at two ends of the steel pipe 11 into a whole through the perforation plug welding 15, so that the structure of the steel pipe 11 and the core filling concrete are integrated, the integrity of the prefabricated part is improved, and the node rigidity is ensured.

Furthermore, a plurality of the stiffening ribs 9 are arranged between the inner ring plate 10 and the outer ring plate 8 at intervals along the circumferential direction, and the stiffening ribs 9 and the screw rods 17 are arranged at intervals. As shown in fig. 7, the stiffening ribs 9 are arranged between the pair of screw holes 19 of the inner and outer ring plates, the number of the stiffening ribs 9 is consistent with that of the screw holes 19, and the plurality of stiffening ribs 9 and the plurality of screws 17 are arranged at intervals, so that the strength and the rigidity of the connecting node are improved; the thickness of the stiffening ribs 9 is determined according to the stress, and the surplus is reserved.

Furthermore, the stiffening rib 9 is a rectangular steel plate with a chamfer, and two corners of the side edge of the stiffening rib 9 connected with the steel pipe 11 are chamfers. As shown in fig. 5, 6 and 10, in the present embodiment, the two corners of the side edge connecting the stiffening rib 9 and the steel pipe 11 are chamfered to form a chamfer structure, so that the stress concentration during the welding process is effectively reduced; wherein, the side of the stiffening rib 9 facing away from the steel pipe 11 can be flush with the outer side of the outer ring plate 8.

Furthermore, embedded parts 4 are embedded in the crown beam 2 and the waist beam, and each embedded part 4 comprises two embedded steel plates 5 and a plurality of embedded screws 6; one end of each embedded screw 6 sequentially penetrates through the two embedded steel plates 5 and is welded with the two embedded steel plates 5, and the other end of each embedded screw extends out of the crown beam 2 or the waist beam and sequentially penetrates through the plurality of screw holes 19 in the inner ring plate 10 and the plurality of screw holes 19 in the outer ring plate 8 at the end part of the assembled support and is fixed through a screw cap 18. As shown in fig. 12 to 13, the two embedded steel plates 5 of the present embodiment are oppositely arranged and embedded in the crown beam 2 or the wale to perform an anchoring function; the two embedded steel plates 5 are provided with a plurality of screw holes 19, the two embedded steel plates are in one-to-one correspondence with the inner ring plate 10 and the plurality of screw holes 19 on the outer ring plate 8, one ends of the plurality of embedded screws 6 correspondingly penetrate through the corresponding screw holes 19 on the two embedded steel plates 5 and are welded with the embedded steel plates 5, and the other ends of the plurality of embedded screws correspondingly penetrate through the plurality of screw holes 19 on the inner ring plate 10 and the plurality of screw holes 19 on the outer ring plate 8 and are fixed through screw caps 18.

In the embodiment, all steel structures such as the steel pipe 11, the inner ring plate 10, the outer ring plate 8 and other parts which are directly contacted with the outside need to be coated with antirust materials in advance, so that the surface of the steel structures is prevented from being rusted and damaged, and the strength is prevented from being reduced; the nuts 18 are preferably two stacked to prevent loosening, and a backing plate may be provided under the nuts 18 as needed.

Example two

The embodiment provides a construction method of an assembly type foundation pit inner support structure, which comprises the following steps:

s1, manufacturing the prefabricated support sections 3 and the embedded parts 4 in a factory according to a design drawing, and transporting to a construction site;

s2, splicing the prefabricated support sections 3 section by section through the screw rods 17 and the nuts, and meanwhile installing the disassembling gaskets 20 between at least two adjacent prefabricated support sections 3 to assemble an assembled support; and the two ends of the assembled support are connected with the embedded part 4 through screw rods 17;

s3, embedding a support 7 at the supporting position in the foundation pit;

s4, hoisting the assembled support, and placing the assembled support on a support 7 to place the embedded parts 4 at two ends of the assembled support at the position of the crown beam 2 or the waist beam to be poured;

s5, pouring the crown beam 2 or the waist beam to embed the embedded part 4 therein;

s6, after the construction is finished, firstly unscrewing the screw rods 17 on the two prefabricated support sections 3 with the disassembly gaskets 20 arranged in the middle, and disassembling the disassembly gaskets 20;

s7, unscrewing the screw 17 segment by segment and recovering the prefabricated support segments 3.

In this embodiment, the embedded parts 4 at the two ends of the fabricated support are firstly placed at the positions of the crown beam 2 or the waist beam to be cast, then the crown beam 2 or the waist beam is cast, and meanwhile, the embedded parts 4 at the two ends of the fabricated support are cast in the embedded parts, so that the strength of the two ends of the fabricated support and the node of the crown beam 2 or the waist beam is improved, and the safety and stability of the foundation pit project are ensured. The assembled support in the embodiment can be rigidly connected with the crown beam 2 or the waist beam, so that in the ultra-deep foundation pit, the assembled support can replace a plurality of traditional concrete supports, and the assembly rate is improved.

The specific method for manufacturing the prefabricated support section 3 in the factory in step S1 of this embodiment may be:

s11, preparing a steel pipe 11, a sealing plate 14, an inner ring plate 10 and an outer ring plate 8 according to a design drawing;

s12, arranging a hoop reinforcement 12 and a plurality of longitudinal reinforcements 13 in the steel pipe 11;

s13, respectively welding sealing plates 14 on the end surfaces of the two ends of the steel pipe 11, and respectively connecting the two ends of the longitudinal rib 13 with the sealing plates 14 on the two ends of the steel pipe 11 through the perforation plug welding 15;

s14, welding an inner ring plate 10 on one surface of the closing plate 14, which is far away from the steel pipe 11, circumferentially welding an outer ring plate 8 on the outer wall of the two ends of the steel pipe 11, and welding stiffening ribs 9 between the inner ring plate 10 and the outer ring plate 8; then pouring filling concrete 16 in the steel pipe 11 and reserving the hollow part to finish the manufacture of the concrete support prefabricated member of the hollow steel pipe 11; or pouring filling concrete 16 in the steel pipe 11 and reserving a hollow part, then welding an inner ring plate 10 on one surface of the closing plate 14, which is far away from the steel pipe 11, annularly welding outer ring plates 8 on the outer walls of two ends of the steel pipe 11, and welding stiffening ribs 9 between the inner ring plate 10 and the outer ring plates 8 to complete the manufacture of the concrete support prefabricated member of the hollow steel pipe 11.

In the embodiment, the concrete 16 can be poured and filled in the steel pipe 11 by adopting a centrifugal process, so that an internal hollow can be automatically formed, the steel pipe 11 can be used as an external template of the centrifugal process without being detached, and meanwhile, compared with the conventional cast-in-place vibration process, the centrifugal process is convenient for realizing high-strength concrete, and the concrete of the hollow steel pipe 11 has higher bearing capacity and deformation resistance and better durability; other processes may also be used to accomplish this.

In step S2 of this embodiment, when the prefabricated support segments 3 are spliced, the inner ring plates 10 at the end portions of the two prefabricated support segments 3 are aligned, and then the screws 17 sequentially pass through the outer ring plate 8 and the inner ring plate 10 at the end portion of one of the prefabricated support segments 3, and the inner ring plate 10 and the outer ring plate 8 at the end portion of the other prefabricated support segment 3 and are fixed by the nuts 18, so as to splice the two prefabricated support segments 3; when the two prefabricated support sections 3 with the disassembly gasket 20 arranged in the middle are assembled, firstly, a layer of lubricant is coated on two side surfaces of the disassembly gasket 20, then, the disassembly gasket 20 is placed between the two prefabricated support sections 3, the screw 17 sequentially penetrates through the outer ring plate 8 and the inner ring plate 10 at the end part of one prefabricated support section 3, the disassembly gasket 20, the inner ring plate 10 at the end part of the other prefabricated support section 3 and the screw hole 19 on the outer ring plate 8 and is fixed through the screw cap 18, when in disassembly, the screw 17 and the screw cap 18 are firstly disassembled, then, the disassembly gasket 20 is disassembled, the axial force between the prefabricated components is eliminated, and then, the prefabricated support sections 3 are disassembled section by section. In the embodiment, the support is not easy to be damaged due to the effect of the protective wall of the external steel pipe 11, the joints are connected by the high-strength screw rods 17, and the prefabricated support sections 3 can be recycled by removing the high-strength screw rods 17, so that the cost is reduced.

The specific method for embedding the support 7 in step S3 of this embodiment is as follows: the concrete base 23 is constructed firstly, the steel legs 22 are embedded in the concrete base 23, and then the concave steel blocks 21 with the grooves on the upper surfaces are welded on the steel legs 22. As shown in fig. 14-15, the concave steel block 21 has a concave groove on its upper surface, and the concave groove matches with the profile of the steel pipe 11 of the prefabricated support section 3 to facilitate the installation of the fabricated support, serving as a temporary support. The support 7 of the embodiment can also adopt other structural forms, and can play a temporary supporting role for the assembled support; under the condition that each component of the support 7 can bear the self weight of the prefabricated support, the size of each component is as small as possible so as to reduce the self weight.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides an assembled foundation ditch inner support structure convenient to dismantle which characterized in that: the building comprises a building enclosure and an assembled support; the top of the enclosure structure is provided with a crown beam, the inner side of the enclosure structure is provided with a waist beam, and the assembled supports are supported between two opposite sides of the crown beam and between two opposite sides of the waist beam; the assembled support is formed by splicing a plurality of prefabricated support sections, and a disassembly gasket is arranged between at least two adjacent prefabricated support sections.

2. The prefabricated foundation pit support structure convenient to disassemble as claimed in claim 1, wherein: the prefabricated support sections comprise steel pipes, inner ring plates and outer ring plates; the end faces of two ends of the steel pipe are welded with inner ring plates, and the outer walls of two ends of the steel pipe are welded with outer ring plates in an annular mode; the inner ring plate and the outer ring plate which are positioned at the same end of the steel pipe are connected through a stiffening rib, and the stiffening rib is welded with the steel pipe; a plurality of screw holes are formed in the inner ring plate and the outer ring plate at intervals in the circumferential direction, and the screw holes in the outer ring plate correspond to the screw holes in the inner ring plate one by one; and corresponding screw holes on the inner ring plate and the outer ring plate on the adjacent prefabricated support sections are respectively provided with a screw and are fixed through nuts.

3. The prefabricated foundation pit supporting structure convenient to disassemble as claimed in claim 2, wherein: the disassembling gasket is provided with a plurality of screw holes, and the screw holes on the disassembling gasket correspond to the screw holes on the outer ring plate and the screw holes on the inner ring plate one by one; and the screw rod penetrates through a corresponding screw rod hole in the disassembling gasket.

4. The prefabricated foundation pit supporting structure convenient to disassemble as claimed in claim 2, wherein: filling concrete is poured in the steel pipe, and a hollow part which penetrates through the filling concrete along the axial direction is formed in the filling concrete; the terminal surface at steel pipe both ends all welds the shrouding, interior crown plate welds in deviate from on the shrouding on the one side of steel pipe.

5. The prefabricated foundation pit support structure convenient to disassemble as claimed in claim 4, wherein: the sealing plate, the inner ring plate and the outer ring plate are all annular, the size of the inner ring of the sealing plate and the size of the inner ring plate are the same as that of the hollow part filled with concrete, and the size of the inner ring of the outer ring plate is the same as that of the outer ring of the steel pipe.

6. The prefabricated foundation pit support structure convenient to disassemble as claimed in claim 4, wherein: the filling concrete is internally provided with a plurality of circumferential stirrups and a plurality of longitudinal reinforcements, the circumferential stirrups are arranged at intervals along the supporting direction, the longitudinal reinforcements are arranged at intervals along the inner sides of the circumferential stirrups, the longitudinal reinforcements are connected with the circumferential stirrups, and the two ends of the longitudinal reinforcements are respectively connected with the sealing plates at the two ends of the steel pipe through perforated plug welding.

7. The prefabricated foundation pit supporting structure convenient to disassemble as claimed in claim 2, wherein: a plurality of stiffening ribs are arranged between the inner ring plate and the outer ring plate at intervals along the circumferential direction, and the stiffening ribs and the screw rods are arranged at intervals.

8. The prefabricated foundation pit support structure convenient to disassemble as claimed in claim 7, wherein: the stiffening rib is a chamfered rectangular steel plate, and two corners of the side edge connected with the steel pipe on the stiffening rib are chamfers.

9. The prefabricated foundation pit supporting structure convenient to disassemble as claimed in claim 2, wherein: embedded parts are embedded in the crown beam and the waist beam, and each embedded part comprises an embedded steel plate and a plurality of embedded screws; one ends of the embedded screws respectively penetrate through the embedded steel plates in sequence, and the other ends of the embedded screws extend out of the crown beam or the waist beam and respectively penetrate through the plurality of screw holes in the inner ring plate and the plurality of screw holes in the outer ring plate at the end part of the assembled support in sequence and then are fixed through nuts.

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