Combined supporting structure for deep foundation pit earth excavation

Abstract

The utility model discloses a combined supporting structure for earth excavation of a deep foundation pit, and relates to the technical field of civil engineering. The device structurally comprises a support ring beam, an end positioning seat, a fixed steel strut and a telescopic steel strut assembly, the telescopic steel strut assembly comprises an outer sleeve and an inner sleeve which are in axial sliding fit. Two top extension positioning seats are axially symmetrically mounted on the outer wall of the inner sleeve through bolts; a jack is mounted between the top extension positioning seat and the outer sleeve; the two ends of the fixed steel supporting column and the opposite far ends of the outer sleeve and the inner sleeve are each fixedly provided with a flange disc. By means of the structure that the telescopic steel supporting column assemblies are combined with the supporting ring beam and the standardized and modularized design, the applicability and flexibility of the supporting structure are improved, and the requirements of foundation pits with different widths and depths can be met; and the design of flange disc connection and rapid installation and positioning is adopted, so that the construction efficiency and safety are improved. The protective cover provides protection for key components such as the jack, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of civil engineering, and particularly relates to a combined support structure for deep foundation pit earth excavation. Background Technique

[0002] In the field of civil engineering, especially in urban underground engineering, the excavation and support of deep foundation pits are important measures to ensure construction safety, protect the surrounding environment and buildings. Traditional deep foundation pit support methods include various types, such as slope excavation, soil nail wall, row pile wall, diaphragm wall, etc. These technologies have their own characteristics and application scopes, but there are also some limitations, such as strong dependence on the environment, long construction period, high cost, etc.

[0003] In recent years, with the acceleration of the urbanization process and the increase in the development and utilization of urban underground space, deep foundation pit projects are facing more complex geological conditions and more stringent environmental protection requirements, and the limitations of traditional support technologies are becoming increasingly prominent. For example, during the initial excavation and subsequent construction process, a large number of steel pipes, welded parts, etc. are required to support the steel sheet piles. Due to different working conditions, the shapes and sizes of the excavated pits are different, and the sizes of the steel pipes and welded parts used for supporting the steel sheet piles vary greatly, which brings a lot of trouble to transportation and installation. In addition, the non-modular structure manufacturing and installation adjustment both bring complicated workloads; for areas with soft soil layers, the support structure needs to be able to adaptively adjust the support expansion pressure and the support length. To solve these problems, the utility model provides a combined support structure for deep foundation pit earth excavation. Content of the Utility Model

[0004] The purpose of the utility model is to provide a combined support structure for deep foundation pit earth excavation. By combining the support ring beam, end positioning seat, fixed steel support column and telescopic steel support column assembly, and through standardized and modular design, the applicability and flexibility of the support structure are improved, and the problem of complicated installation and adjustment of deep foundation pit support is solved.

[0005] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0006] The utility model relates to a combined support structure for earthwork excavation of deep foundation pits, which comprises a support ring beam, end positioning seats, fixed steel columns, and telescopic steel column assemblies; the telescopic steel column assemblies include an outer sleeve and an inner sleeve that are axially slidably matched; two top extension positioning seats are symmetrically installed on the outer wall of the inner sleeve through bolts; a jack is installed between the top extension positioning seats and the outer sleeve; flange discs are respectively fixed at both ends of the fixed steel column and at the relative far ends of the outer sleeve and the inner sleeve, and the flange discs are coaxially arranged with the fixed steel column; the flange discs are coaxially arranged with the outer sleeve; the two flange discs between the fixed steel column and the outer sleeve are connected by bolts and nuts; the flange disc at the other end of the fixed steel column is fixedly installed on the end positioning seat through bolts; the flange disc at the end of the inner sleeve is fixedly installed on the other end positioning seat through bolts; the end positioning seats are snap-fitted and installed on the support ring beam.

[0007] As a preferred technical solution of the utility model, the support ring beam comprises two parallel rectangular plate bodies; a column of vertically arranged fixed inner lining plates are welded and fixed into a whole between the two rectangular plate bodies; two columns of first threaded through holes are respectively opened at both ends of the rectangular plate bodies; adjacent support ring beams are connected into a whole through connecting plates and bolts.

[0008] As a preferred technical solution of the utility model, the end positioning seat comprises an insertion block placed between the two rectangular plate bodies; an L-shaped buckle plate is fixed on one side of the upper end of the insertion block; a circle of second threaded through holes matched with the flange disc are opened on the outer side surface of the L-shaped buckle plate; inner arc support plates for supporting the flange disc are symmetrically fixed on the lower half part of the outer side surface of the L-shaped buckle plate; a V-shaped groove is opened in the upper half part of the insertion block.

[0009] As a preferred technical solution of the utility model, a column of partition grooves perpendicular to the L-shaped buckle plate are opened in the insertion block along the length direction of the rectangular plate body, and the width of the partition grooves is greater than the width of the fixed inner lining plate.

[0010] As a preferred technical solution of the utility model, two support ear seats are symmetrically fixed at one end of the outer sleeve adjacent to the inner sleeve; a first limit retaining ring matched with the base of the jack is fixed on the side surface of the support ear seat relative to the inner sleeve.

[0011] As a preferred technical solution of the utility model, four columns of first threaded blind holes matched with the top extension positioning seats are symmetrically opened on the circumferential side surface of the inner sleeve; a circle of first reinforcing rib plates are welded between the inner sleeve and the flange disc.

[0012] As a preferred technical solution of the present utility model, the top extension positioning seat includes a T-shaped plate; four bolt through holes are provided in the flat plate portion of the T-shaped plate; on the side of the vertical plate portion of the T-shaped plate opposite to the outer sleeve, a second limiting retaining ring cooperating with the telescopic end of the jack is fixed; a row of second reinforcing rib plates is fixed between the other side of the vertical plate portion of the T-shaped plate and the flat plate portion of the T-shaped plate.

[0013] As a preferred technical solution of the present utility model, a second threaded blind hole is respectively provided on the upper and lower end faces of the ear seat; a protective cover covering the outside of the two jacks is installed on the two ear seats.

[0014] As a preferred technical solution of the present utility model, the protective cover includes a U-shaped plate body; a U-shaped notch cooperating with the outer wall of the inner sleeve is provided in the bent portion of the U-shaped plate body; a single ear cooperating with the connection of the outer sleeve is respectively provided at both ends of the two parallel plates of the U-shaped plate body.

[0015] The present utility model has the following beneficial effects:

[0016] 1. The present utility model mounts and installs an end positioning seat on the supporting ring beam, and a rigid support telescopic steel column assembly can be stably installed therebetween. After the two ends of the telescopic steel column assembly are bolted to the end positioning seat, the telescopic process of the telescopic steel column assembly is stable. During the telescopic process, only the telescopic amount of the jack needs to be adjusted, and no other structural adjustments are required. The overall structure is modularly manufactured and installed, and the overall installation and telescopic operation are convenient.

[0017] 2. Due to the design of the telescopic steel column assembly of the present utility model, the supporting structure can adapt to foundation pits of different widths, improving the versatility and adaptability of the structure. The combination of the top extension positioning seat and the jack enables the supporting system to adjust the pressure on the side wall of the foundation pit according to actual needs, increasing the flexibility of construction.

[0018] 3. The present utility model installs the fixed steel column and the telescopic steel column assembly on the supporting ring beams on both sides of the foundation pit through the end positioning seat. Such a design ensures the installation stability of the entire supporting system, and the pressure can be conveniently and quickly adjusted by two jacks, ensuring the stability of the side wall of the foundation pit and the safety of construction.

[0019] 4. The design of the end positioning seat of the present utility model takes into account the convenience of installation and maintenance. Through elements such as L-shaped buckle plates, inner arc supporting plates, and V-shaped grooves, effective fixation and quick installation positioning of the flange disc are achieved.

[0020] 5. The design of the supporting structure of the present utility model takes into account cost-effectiveness. By using standardized and modular components, the manufacturing and construction costs are reduced, and the easy installation and maintenance also reduce the long-term operation costs.

[0021] 6. The utility model adopts a standardized flange disc, which reduces the use of bolt types, simplifies the construction process, and improves the construction efficiency. At the same time, the design of the protective cover not only provides protection for the jack, but also facilitates the operation, further improving the construction efficiency.

[0022] Of course, it is not necessary for any product implementing the utility model to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of the combined support structure for earth excavation in deep foundation pits of the present utility model.

[0025] Figure 2 For Figure 1 the top view.

[0026] Figure 3 It is a schematic structural diagram of the support ring beam.

[0027] Figure 4 It is a schematic structural diagram of the end positioning seat.

[0028] Figure 5 It is a schematic structural diagram of the telescopic steel support column assembly.

[0029] Figure 6 It is a schematic structural diagram of the top extension positioning seat.

[0030] Figure 7 It is a schematic structural diagram of the protective cover.

[0031] In the accompanying drawings, the list of components represented by each reference numeral is as follows:

[0032] 1 - support ring beam, 2 - end positioning seat, 3 - fixed steel support column, 4 - outer sleeve, 5 - inner sleeve, 6 - top extension positioning seat, 7 - jack, 8 - flange disc, 9 - protective cover, 11 - rectangular plate body, 12 - fixed inner lining plate, 13 - first threaded through hole, 21 - insertion block, 22 - L-shaped clamping plate, 23 - second threaded through hole, 24 - inner arc support plate, 25 - V-shaped groove, 26 - partition groove, 41 - ear seat, 42 - first limit retaining ring, 43 - second threaded blind hole, 51 - first threaded blind hole, 52 - first stiffening rib plate, 61 - T-shaped plate, 62 - bolt through hole, 63 - second limit retaining ring, 64 - second stiffening rib plate, 91 - U-shaped plate body, 92 - U-shaped notch, 93 - single ear. Detailed implementation manners

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. Specific Embodiment 1:

[0035] Please refer to Figures 1-7 As shown, the present utility model is a combined support structure for deep foundation pit earth excavation, including a support ring beam 1, an end positioning seat 2, a fixed steel support column 3, and a telescopic steel support column assembly. Before the deep foundation pit excavation, steel pipe enclosures are pressed into both sides of the foundation pit to be excavated. After the steel pipes are hinged, cement is injected to connect them to form an isolation retaining wall. For soil layers with high water content, a water retaining wall is constructed on the outside of the isolation retaining wall. A support frame is welded on the steel pipe, and the support ring beam 1 is horizontally welded and installed on the steel pipe. The end positioning seat 2 is snap-fitted and installed on the support ring beam 1. The combination support between the end positioning seats 2 on both sides of the foundation pit is carried out through the fixed steel support column 3 and the telescopic steel support column assembly.

[0036] Specifically, the telescopic steel support column assembly includes an outer sleeve 4 and an inner sleeve 5 that are axially slidably mated. Two top extension positioning seats 6 are symmetrically installed on the outer wall of the inner sleeve 5 through bolts. A jack 7 is installed between the top extension positioning seat 6 and the outer sleeve 4. In the telescopic steel support column assembly, by changing the different installation positions of the top extension positioning seat 6 on the inner sleeve 5, the support requirements for foundation pits of different widths can be adapted, and the pressure on both sides of the foundation pit can be changed by the two jacks 7, which can be quickly adjusted before and during the construction.

[0037] In order to facilitate and quicken the overall connection, a flange disc 8 is respectively fixed at both ends of the fixed steel support column 3 and at the relative far ends of the outer sleeve 4 and the inner sleeve 5. The flange disc 8 is coaxially arranged with the fixed steel support column 3. The flange disc 8 is coaxially arranged with the outer sleeve 4. Using the same specification of flange discs 8 reduces the types of bolts used and facilitates the construction.

[0038] The two flange discs 8 between the fixed steel support column 3 and the outer sleeve 4 are connected by bolts and nuts. The flange disc 8 at the other end of the fixed steel support column 3 is fixedly installed on the end positioning seat 2 through bolts. The flange disc 8 at the end of the inner sleeve 5 is fixedly installed on the other end positioning seat 2 through bolts. The fixed steel support column 3 and the telescopic steel support column assembly for foundation pit earth support are installed on the support ring beam 1 on both sides of the foundation pit through the two end positioning seats 2, with high installation stability, and the two jacks 7 are convenient and fast to adjust the pressure on the side wall of the foundation pit.

[0039] Among them, the support ring beam 1 includes two rectangular plate bodies 11 arranged in parallel. The two rectangular plate bodies 11 are welded and fixed into one body by a row of vertically arranged fixed lining plates 12. Two rows of first threaded through holes 13 are respectively opened at both ends of the rectangular plate body 11. Adjacent two support ring beams 1 are connected into one body by a connecting plate and bolts.

[0040] Among them, the end positioning seat 2 includes an inserting block 21 placed between the two rectangular plate bodies 11. One side of the upper end of the inserting block 21 is fixed with an L-shaped buckle plate 22. A circle of second threaded through holes 23 matching with the flange disc 8 is opened on the outer side surface of the L-shaped buckle plate 22. Inner arc supporting plates 24 for supporting the flange disc 8 are symmetrically fixed on the lower half of the outer side surface of the L-shaped buckle plate 22. A V-shaped groove 25 is opened in the upper half of the inserting block 21. The inserting block 21 of the end positioning seat 2 is placed between the two rectangular plate bodies 11 to strengthen the structure of the rectangular plate body 11 and improve the stability of the pressure support. The combination of the inserting block 21 with the L-shaped buckle plate 22 and the inner arc supporting plates 24 can effectively fix the flange disc 8. Before installation and fastening, the inner arc supporting plate 24 supports and guides the flange disc 8, which helps to quickly install and position.

[0041] In order to avoid the insertion block 21 being blocked in the area containing the fixed lining plate 12, a row of separating grooves 26 perpendicular to the L-shaped buckle plate 22 is opened in the inserting block 21 along the length direction of the rectangular plate body 11, and the width of the separating groove 26 is greater than the width of the fixed lining plate 12.

[0042] Among them, the specific connection structure of the outer sleeve 4, the inner sleeve 5 and the top extension positioning seat 6 is that two ear seats 41 are symmetrically fixed at one end of the outer sleeve 4 adjacent to the inner sleeve 5. A first limit retaining ring 42 matching with the base of the jack 7 is fixed on the side surface of the ear seat 41 relative to the inner sleeve 5. Four rows of first threaded blind holes 51 matching with the top extension positioning seat 6 are symmetrically opened on the circumferential side surface of the inner sleeve 5. A first reinforcing rib plate 52 is welded in a circle between the inner sleeve 5 and the flange disc 8. The top extension positioning seat 6 specifically includes a T-shaped plate 61. Four bolt through holes 62 are opened in the flat part of the T-shaped plate 61. A second limit retaining ring 63 matching with the telescopic end of the jack 7 is fixed on one side of the vertical plate part of the T-shaped plate 61 relative to the outer sleeve 4. A row of second reinforcing rib plates 64 is fixed between the other side surface of the vertical plate part of the T-shaped plate 61 and the flat part of the T-shaped plate 61.

[0043] In order to protect the two jacks 7, protective covers 9 covering the outside of the two jacks 7 are installed on the two ear seats 41. A second threaded blind hole 43 is respectively opened at the upper and lower end surfaces of the ear seat 41.

[0044] In order to facilitate the installation of the protective cover 9 and not affect the operation of the jack 7, the main body of the protective cover 9 includes a U-shaped plate body 91. A U-shaped notch 92 that cooperates with the outer wall of the inner sleeve 5 is formed in the bent portion of the U-shaped plate body 91. Single ear portions 93 that are respectively connected and cooperate with the outer sleeve 4 are provided at both ends of the two parallel plates of the U-shaped plate body 91. The protective cover 9 can be directly snapped onto the inner sleeve 5 from the side of the inner sleeve 5. The two ends of the protective cover 9 are fixed to the outer sleeve 4 by bolts, and thus the installation of the protective cover 9 is completed. The protective cover 9 provides protection in the up and down direction of the jack 7, and at the same time, the operation of the jack 7 can be carried out through the side opening of the protective cover 9.

[0045] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0046] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present utility model, so that those skilled in the relevant technical field can understand and utilize the present utility model well. The present utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A combined support structure for earth excavation of deep foundation pits, characterized in that: It includes a support ring beam (1), end positioning seats (2), fixed steel columns (3), and telescopic steel column assemblies; The telescopic steel column assembly includes an outer sleeve (4) and an inner sleeve (5) that are axially slidably fitted; two top extension positioning seats (6) are symmetrically installed on the outer wall of the inner sleeve (5) through bolts; a jack (7) is installed between the top extension positioning seat (6) and the outer sleeve (4); Flange discs (8) are respectively fixed at both ends of the fixed steel column (3) and at the relatively far ends of the outer sleeve (4) and the inner sleeve (5), and the flange discs (8) are coaxially arranged with the fixed steel column (3); the flange discs (8) are coaxially arranged with the outer sleeve (4); The two flange discs (8) between the fixed steel column (3) and the outer sleeve (4) are connected by bolts and nuts; the flange disc (8) at the other end of the fixed steel column (3) is fixedly installed on the end positioning seat (2) through bolts; the flange disc (8) at the end of the inner sleeve (5) is fixedly installed on the other end positioning seat (2) through bolts; The end positioning seat (2) is snap-fitted and installed on the support ring beam (1).

2. The combined support structure for deep foundation pit earth excavation according to claim 1, characterized in that, The support ring beam (1) includes two parallel rectangular plate bodies (11); the two rectangular plate bodies (11) are welded and fixed into one body by a row of vertically arranged fixed inner lining plates (12); two rows of first threaded through holes (13) are respectively opened at both ends of the rectangular plate body (11); adjacent support ring beams (1) are connected into one body by connecting plates and bolts.

3. The combined support structure for deep foundation pit earth excavation according to claim 2, characterized in that, The end positioning seat (2) includes an insertion block (21) placed between the two rectangular plate bodies (11); an L-shaped clamping plate (22) is fixed on one side of the upper end of the insertion block (21); a second threaded through hole (23) that cooperates with the flange disc (8) is opened in a circle on the outer side of the L-shaped clamping plate (22); inner arc supporting plates (24) for supporting the flange disc (8) are symmetrically fixed on the lower half of the outer side of the L-shaped clamping plate (22); a V-shaped groove (25) is opened in the upper half of the insertion block (21).

4. The combined support structure for deep foundation pit earthwork excavation according to claim 3, characterized in that, A row of partition grooves (26) perpendicular to the L-shaped clamping plate (22) is opened in the insertion block (21) along the length direction of the rectangular plate body (11), and the width of the partition groove (26) is greater than the width of the fixed inner lining plate (12).

5. The combined support structure for deep foundation pit earth excavation according to claim 2, characterized in that, Two ear seats (41) are symmetrically fixed at one end of the outer sleeve (4) adjacent to the inner sleeve (5); a first limit retaining ring (42) that cooperates with the base of the jack (7) is fixed on the side of the ear seat (41) opposite to the inner sleeve (5).

6. The combined support structure for deep foundation pit earthwork excavation according to claim 1, characterized in that Four rows of first threaded blind holes (51) that cooperate with the top extension positioning seat (6) are symmetrically opened on the circumferential side of the inner sleeve (5); a first reinforcing rib plate (52) is welded in a circle between the inner sleeve (5) and the flange disc (8).

7. The combined support structure for deep foundation pit earthwork excavation according to claim 6, characterized in that, The top extension positioning seat (6) includes a T-shaped plate (61); four bolt through holes (62) are formed in the flat part of the T-shaped plate (61); a second limit retaining ring (63) that cooperates with the telescopic end of the jack (7) is fixed to one side of the vertical plate part of the T-shaped plate (61) relative to the outer sleeve (4); a row of second reinforcing rib plates (64) is fixed between the other side surface of the vertical plate part of the T-shaped plate (61) and the flat part of the T-shaped plate (61).

8. The combined support structure for deep foundation pit earthwork excavation according to claim 5, characterized in that, A second threaded blind hole (43) is formed in each of the upper and lower end faces of the ear seat (41); a protective cover (9) covering the outside of the two jacks (7) is installed on the two ear seats (41).

9. The combined support structure for deep foundation pit earthwork excavation according to claim 8, wherein, The protective cover (9) includes a U-shaped plate body (91); a U-shaped notch (92) that cooperates with the outer wall of the inner sleeve (5) is formed in the bent part of the U-shaped plate body (91); a single ear (93) that is connected and cooperates with the outer sleeve (4) is provided at each of the two ends of the two parallel plates of the U-shaped plate body (91).

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