An open-cut culvert foundation pit supporting structure

Abstract

The present application relates to the technical field of pit supporting, and specifically discloses a kind of open cut culvert pit supporting structure;Including: two rows of fences, horizontally opposite arrangement;Two rows of hanging boards are correspondingly matched with two rows of fences, and multiple hanging boards in each row are sequentially distributed and overlapped on the top end of single row of fences;Multiple groups of inner support assemblies are connected between two scrapers in the horizontally opposite position of two rows of hanging boards;Two groups of surrounding purlin assemblies;Surrounding purlin assembly includes multiple surrounding purlin plates, which are horizontally slidably inserted into multiple end pieces one by one, adjacent surrounding purlin plates are inserted and matched, and a locking clamp is inserted between adjacent surrounding purlin plates for connecting and locking them;The pit supporting structure provided by the present application improves the convenience and speed of supporting assembly, disassembly, reduces the difficulty of assembly and disassembly, improves the integrity and flexibility of the supporting structure, avoids or reduces damage and deformation of the supporting structure itself, and ensures the reusability of the supporting structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation pit support, and specifically provides a open-cut culvert foundation pit support structure. BACKGROUND

[0002] The open-cut culvert foundation pit is a temporary pit structure formed by open excavation in the construction of a culvert project, and is used for the construction of a culvert foundation and a culvert main body, and finally the foundation pit is backfilled to the ground state by earthwork. During the construction of the open-cut foundation pit, the excavation will destroy the original soil balance, which is easy to cause the instability and collapse of the soil on the side wall of the foundation pit, and even cause major accidents such as the settlement of the surrounding ground, the cracking of buildings, and the rupture of pipelines. Therefore, in accordance with the principle of supporting first and then constructing, before excavation, two rows of steel sheet piles are driven along the two sides of the foundation pit to be excavated, and the steel sheet piles in each row are mutually engaged to form a wall barrier separating the foundation pit from the surrounding soil. During excavation, the excavation is carried out by layering from top to bottom between the two rows of steel sheet piles. After excavation, the steel sheet piles on one side of the foundation pit are exposed. Therefore, in order to ensure the stability of the support, an inner support structure is further needed between the two rows of steel sheet piles for further bracing and reinforcement. When the design depth of the foundation pit is deep, synchronous layer-by-layer support is also needed as the excavation depth increases.

[0003] In the prior art, the inner support structure for each layer of reinforcement mainly consists of two groups of enclosing purlins and one group of inner support rods. The two groups of enclosing purlins cooperate with the two rows of steel sheet piles, and the enclosing purlins in the same group horizontally connect multiple steel sheet piles in one row, and the group of inner support rods is distributed and fixed between the two rows of enclosing purlins. The above is the common structure of the existing foundation pit support, which can effectively play a supporting role, but has the following problems: (1) The enclosing purlins need to be fixed on the steel sheet piles. The most common way is to weld the enclosing purlins directly on the steel sheet piles. Although the fixation is firm, the welding process is easy to cause deformation of the steel sheet piles and the enclosing purlins, affecting the subsequent reuse, and when disassembled, the welded part needs to be cut, which is not only inconvenient to disassemble, but also causes damage to the steel sheet piles and the enclosing purlins. In addition, some choose to fix the connection by bolts, which need to weld ear plates with bolt holes on the steel sheet piles, and then fix the enclosing purlins on the ear plates by bolts. Obviously, this affects the assembly efficiency of the support. In addition, there is a position error in the welding of the ear plate, and after the random assembly of the steel sheet piles, the previously welded ear plate may not be used for the fixation of the enclosing purlins due to the position error.

[0004] (2) In the existing inner support structure, the length of the inner support rod is fixed, and in actual construction, the inner support rod with a fixed length is only suitable for the construction support of the foundation pit with a corresponding standard width, and cannot meet the support needs of various widths of the foundation pit. In addition, for the corresponding width of the foundation pit construction, there is a real error in the width between the two rows of steel sheet piles during support, which increases the difficulty of fixing the inner support rod between the two rows of enclosing purlins, and affects the stability of the fixation of the two ends of the inner support rod.

[0005] (3) In the existing support structure, the multiple internal support structures of the layer-by-layer support are independent of each other. Therefore, the support is not constructed into a horizontally connected support frame in space, which affects the overall strength and stability of the support to a certain extent. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a support structure for open-cut culvert foundation pits, which solves the problems mentioned in the background section.

[0007] To achieve the above objectives, the present invention employs the following technical solution: a support structure for an open-cut culvert foundation pit, comprising: two rows of retaining walls, arranged horizontally opposite each other, assembled and deployed along the excavation direction at both sides of the foundation pit; two rows of hanging plates, corresponding to and cooperating with the two rows of retaining walls, with multiple hanging plates in each row sequentially distributed and overlapping the top of a single row of retaining walls; multiple sets of internal bracing assemblies, with an internal bracing assembly connected between two scrapers in horizontally opposite positions in the two rows of hanging plates, and multiple internal bracing assemblies in a single set being vertically distributed; the internal bracing assembly includes two horizontally symmetrically arranged end members and an assembly beam detachably assembled and fixed between the two end members; a single set Multiple end pieces located on the same side are vertically connected and clamped onto the fence. The topmost end piece and the hanging plate are detachably assembled and connected together to the top of the fence. Two sets of waler assemblies are attached to the two rows of fences. Multiple waler assemblies in a single set are correspondingly connected to multiple inner support assemblies in the same set. The waler assembly includes multiple waler plates that are horizontally slidably inserted into multiple end pieces at the same height and on the same side. Adjacent waler plates are inserted and engaged, and locking clips are inserted between adjacent waler plates to lock them together. When the locking clips are inserted and locked between adjacent waler plates, they can be clamped onto the fence simultaneously.

[0008] Preferably, the end piece includes a suspension seat and an end beam horizontally fixed on the suspension seat. The suspension seat is clamped on the enclosure and can be hung on the hanging plate. Multiple suspension seats can be vertically and sequentially hung and assembled. The waler plate is horizontally inserted into the suspension seat. The assembly beam is assembled and connected to two horizontally opposite end beams.

[0009] Preferably, male and female connectors are provided at both horizontal ends of the waler plate, and adjacent waler plates are interlocked and connected through the male and female connectors.

[0010] Preferably, the locking clamp includes a tenon plate, a screw rod vertically and rotatably mounted on the tenon plate, and a clamping plate movably mounted between the horizontal ends of the tenon plate; the waler plate has symmetrical mortises at both ends for the tenon plate to slide vertically into, and the screw rod is threadedly engaged with the male connector; when the tenon plate is inserted between the mortises of two adjacent waler plates and the screw rod is screwed in, the clamping plate is driven to clamp the enclosure simultaneously.

[0011] Preferably, the hanging seat comprises a slot seat in sliding plug-in fit with the surrounding purlin, two upper and lower arranged clamping plates are fixed on the slot seat, both of the clamping plates are clamped on the surrounding fence, the top end of the upper clamping plate is horizontally fixed with a hanging connector, the bottom end of the lower clamping plate is horizontally fixed with a plug-in plate, both of the hanging plate and the plug-in plate can be in plug-in fit with the hanging connector; the end beam is horizontally fixed on the slot seat, and both of the hanging connector and the plug-in plate are arranged towards the end beam.

[0012] Preferably, the plug-in shaft is installed in the end beam in axial sliding fit, the plug-in shaft continuously penetrates the end beam and the slot seat, and the surrounding purlin is provided with a positioning hole for the plug-in shaft to insert.

[0013] Preferably, the clamping plate part comprises two sliding blocks horizontally arranged on both sides of the tenon plate, both of the sliding blocks are fixed with clamping plates in clamping contact with the surrounding fence, and a spring rod is fixed between the two clamping plates; the mortise is provided with a slope surface, the slope surfaces in the two mortises of the surrounding purlin are arranged in a spread shape, and the bottom end of the sliding block is provided with a contact head in contact with the slope surface.

[0014] Preferably, the hanging plate is in L-shaped plate structure, and the lower end of the vertical plate part of the hanging plate is provided with a knife edge.

[0015] Preferably, the end beam is provided with an assembly slot for the horizontal movement of the assembly beam to insert at one end away from the hanging seat, and the side long edge side wall end of the assembly beam is provided with a limiting stop edge for assembly positioning.

[0016] The above technical scheme has the following advantages or beneficial effects: the present application provides a open cut culvert foundation pit support structure, which is provided with an inner support assembly composed of an assembly beam and two end beams, which replaces the existing inner support rod in whole length structure, so that better assembly adaptability flexibility is achieved within a certain width range, the assembly mode of the assembly beam is in turn inserted and hung between the vertically distributed multiple end pieces in the multi-layer support inner support assembly, the mutual series assembly between multiple inner support assemblies in the vertical direction is realized, and the top end of the end piece indirectly forms the hanging connection with the steel sheet pile through the hanging plate; the surrounding purlin assembly is composed of multiple surrounding purlin plates in occlusal assembly, the surrounding purlin plate can be positioned and locked on the end piece through the plug-in shaft, the assembly butt joint between the inner support assembly is realized, the adjacent surrounding purlin plates can be locked and connected through the lock clamping piece in mortise and tenon fit, and the clamping and fixing between the surrounding purlin plate and the steel sheet pile can be simultaneously completed, which replaces the existing direct welding and welding lug connection mode.

[0017] In summary, the foundation pit supporting structure provided by the application adopts the enclosure composed of steel sheet piles as the basis, uses the mode of layer-by-layer suspension, lapping, locking and multiple cooperation clamping to complete the rapid and detachable assembly of the supporting structure, uses the mode of vertical sequential hanging and horizontal insertion and stringing to form a three-dimensional supporting frame, greatly improves the convenience and speed of supporting assembly, lapping and disassembly, reduces the difficulty of assembly and disassembly, improves the integrity and flexibility of the supporting structure, avoids or reduces the damage and deformation of the supporting structure itself, and ensures the reusability of the supporting structure. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application and its features, shapes and advantages will become more apparent upon reading the detailed description of the non-limiting embodiments with reference to the following drawings. The same reference signs indicate the same parts throughout the drawings, which are not necessarily drawn to scale, and the emphasis is on illustrating the main idea of the present application.

[0019] Figure 1 is a three-dimensional structure diagram of a open cut culvert foundation pit supporting structure provided by the application.

[0020] Figure 2 is Figure 1 is an enlarged view of A in

[0021] Figure 3 is a side view of a open cut culvert foundation pit supporting structure provided by the application.

[0022] Figure 4 is a top view of a open cut culvert foundation pit supporting structure provided by the application.

[0023] Figure 5 is a three-dimensional structure diagram of an inner support assembly.

[0024] Figure 6 is a three-dimensional sectional view of an end piece.

[0025] Figure 7 is a three-dimensional structure diagram of a surrounding purlin plate and end piece assembly.

[0026] Figure 8 is a three-dimensional sectional view of a lock clip connected between two surrounding purlin plates in a surrounding purlin assembly.

[0027] Figure 9 is a three-dimensional structure diagram of a mortise plate and screw rod assembly.

[0028] Figure 10 is a three-dimensional structure diagram of a clamping plate.

[0029] In the figure: 1, enclosure; 11, steel sheet pile; 2, hanging plate; 3, inner support assembly; 4, end piece; 41, hanging seat; 411, slot seat; 412, clamping plate; 413, hanging piece; 414, plug-in plate; 42, end beam; 421, assembled slot; 422, extension hole; 43, bolt shaft; 431, limit stop ring; 5, assembled beam; 51, limit stop edge; 6, enclosure purlin assembly; 7, enclosure purlin plate; 71, positioning hole; 72, mortise; 721, inclined surface; 73, male connector; 74, female connector; 8, locking clamp; 81, tenon plate; 811, sliding groove; 82, screw rod; 83, clamping plate; 84, sliding block; 841, contact head; 85, clamping plate; 86, elastic rod. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0031] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0032] Referring to Figure 1 and Figure 4 , a open-cut culvert foundation pit support structure, comprising two rows of enclosures 1, arranged horizontally opposite to each other, respectively arranged along the excavation direction at the pit edge of the two sides of the foundation pit; the enclosure 1 is composed of existing steel sheet piles 11, in the present application, the steel sheet pile 11 is in the form of a trapezoidal channel steel structure, and the two sides of the steel sheet pile 11 have mutually cooperating engagement edges, a single row of enclosures 1 is composed of a plurality of steel sheet piles 11 continuously and alternately engaged, before the formal excavation of the foundation pit, the steel sheet pile 11 is pre-driven into the soil layer by a piling equipment. It should be noted that, in order to facilitate the assembly of the subsequent support, the two rows of steel sheet piles 11 need to be arranged horizontally opposite to each other, and the arrangement form can be seen from Figure 4 .

[0033] Referring to Figure 1 , Figure 2 and Figure 4, two rows of hanging plates 2 are correspondingly matched with the two rows of enclosing fences 1, and multiple hanging plates 2 in each row are sequentially distributed and overlapped at the top end of the single-row enclosing fence 1, specifically, each hanging plate 2 is overlapped on the steel sheet pile 11 with the notch facing away from the foundation pit, the hanging plate 2 is in the form of an L-shaped plate, and the lower end of the vertical plate part of the hanging plate 2 is provided with a knife edge, which facilitates the insertion of the hanging plate 2 into the soil layer. A plurality of inner support assemblies 3 are uniformly distributed along the extension direction of the enclosing fence 1 between the two rows of enclosing fences 1, and each group of inner support assemblies 3 is connected between two adjacent scraping plates in the two rows of hanging plates 2, and multiple inner support assemblies 3 in a single group are vertically distributed; it should be noted that the number of hanging plates 2 corresponds to the number of groups of inner support assemblies 3, and the number of groups of inner support assemblies 3 is determined by the actual supporting requirement, similarly, the number of inner support assemblies 3 in each group is determined by the depth of the pit foundation excavation, and as the excavation deepens, layer-by-layer synchronous support is required, and the number of inner support assemblies 3 in each group in the finally assembled supporting structure can be one, two or three, or even more, to ensure the overall strength and reliability of the supporting structure. In addition, it should be noted that, from the single-row enclosing fence 1, Figure 1 three steel sheet piles 11 are also spaced between the two adjacent groups of inner support assemblies 3, and the plurality of inner support assemblies 3 are uniformly distributed as shown in the figure, but it does not mean that the actual assembly must be in this distribution layout.

[0034] Referring to Figure 2 , Figure 3 , Figure 4 and Figure 5 , the inner support assembly 3 comprises two horizontally symmetrical end pieces 4 and an assembly beam 5 detachably assembled and fixed between the two end pieces 4; the end piece 4 comprises a hanging seat 41 and an end beam 42; the hanging seat 41 comprises a slot seat 411, two upper and lower oppositely arranged clamping plates 412 are welded on the slot seat 411, the clamping plate 412 is in the form of a trapezoidal groove steel structure matched with the outer convex surface of the steel sheet pile 11, the clamping plate 412 is made of spring steel material, the clamping plate 412 has an inner groove with a smaller included angle than that of the two side surfaces of the inner groove of the steel sheet pile 11 in the natural state, and the inner groove surface of the clamping plate 412 is roughened, and the hanging seat 41 is clamped on the steel sheet pile 11 by the two clamping plates 412; the top end of the upper clamping plate 412 is horizontally aligned and welded with a hanging piece 413, and the bottom end of the lower clamping plate 412 is horizontally aligned and welded with a plug-in plate 414, and the hanging piece 413 and the plug-in plate 414 are located on the side away from the inner groove of the clamping plate 412, and the hanging plate 2 and the plug-in plate 414 can be inserted and matched with the hanging piece 413.

[0035] When assembling the supporting structure, as to the single inner support assembly 3, first, two end head pieces 4 are assembled in corresponding positions on two steel sheet piles 11 in the two rows of enclosing fences 1 in horizontal opposite positions, and the two end head pieces 4 of the inner support assembly 3 in the top layer of support are indirectly suspended on the top ends of the steel sheet piles 11 through the hanging plates 2. Specifically, the suspension seat 41 is clamped on the steel sheet pile 11 through the two clamping plates 412, and the top end of the upper clamping plate 412 is aligned with the top end of the steel sheet pile 11. Then, the vertical plate part of the hanging plate 2 is inserted into the soil layer, the horizontal plate part of the hanging plate 2 is aligned with the hanging piece 413, the horizontal plate part of the hanging plate 2 is inserted into the hanging piece 413 through horizontal movement, and is fixed by screw locking. At this time, the end head piece 4 is suspended on the steel sheet pile 11 through the horizontal plate part of the hanging plate 2, and the part near the top end of the steel sheet pile 11 is clamped between the hanging plate 2 and the clamping plate 412. On the basis of the clamping and clamping of the end head piece 4 and the steel sheet pile 11, the end head piece 4 is further fixed on the top end of the steel sheet pile 11 in a suspended and overlapped manner through the hanging plate 2, so as to achieve the purpose of indirect non-welding fixation.

[0036] Referring to Figure 6 and Figure 7 , the end head beam 42 is horizontally and centrally welded on the insertion slot seat 411; the end head beam 42 extends axially from one end away from the suspension seat 41 to form an assembly insertion slot 421 for horizontal movement of the assembly beam 5, and the assembly beam 5 is provided with a limiting baffle 51 on one side of the long side wall end for assembly positioning.

[0037] Referring to Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 8 , a plurality of enclosing purlin assemblies 6 are stringingly assembled between the horizontally distributed plurality of end head pieces 4 on the same row of enclosing fences 1; the enclosing purlin assembly 6 comprises a plurality of enclosing purlin plates 7 which are horizontally and slidingly inserted into the plurality of end head pieces 4 one by one; the end head beam 42 is axially slidingly fitted with a latch shaft 43, the latch shaft 43 continuously penetrates the end head beam 42 and the insertion slot seat 411, and the latch shaft 43 is integrally formed with a limiting baffle 431 to prevent the latch shaft 43 from sliding out of one end of the end head beam 42; the enclosing purlin plate 7 is provided with a positioning hole 71 through which the latch shaft 43 is inserted; the enclosing purlin plate 7 is provided with a male joint 73 and a female joint 74 at the horizontal two ends, respectively, and the adjacent two enclosing purlin plates 7 are engaged and butt-jointed through the male joint 73 and the female joint 74.

[0038] When the end pieces 4 in the plurality of inner support assemblies 3 in a layer are evenly assembled along the two rows of cofferdam 1, the serial assembly of the plurality of coaming plates 7 can be carried out between the plurality of end pieces 4 on the same side. During assembly, the plurality of coaming plates 7 are in a state of sequentially engaging and abutting and are slid horizontally through the plurality of slot seats 411, so that the plurality of coaming plates 7 are distributed one by one at the plurality of slot seats 411. During the overall sliding and advancing process, when the coaming plate 7 at the advancing end is in the central position relative to the slot seat 411, the remaining coaming plates 7 are also in the relatively central position of the corresponding slot seat 411. During actual support assembly, considering that the foundation pit is relatively long, the serial assembly of the plurality of inner support assemblies 3 and the plurality of coaming plates 7 can be divided into multiple sections and batches in the extension direction of the cofferdam 1.

[0039] During the segmented and batched assembly, when a batch of coaming plates 7 are assembled in place by sliding, the splicing beams 5 can be spliced between the two end pieces 4 in each inner support assembly 3 in sequence. Specifically, during splicing, the pin shafts 43 in the two end pieces 4 are first slid into the positioning holes 71 in the coaming plate 7 on one side, to complete the relative locking between the coaming plate 7 and the end piece 4. Then, the splicing beam 5 is inserted horizontally into the splicing slot 421 of the two end head beams 42 until the limiting stop edge 51 contacts the side wall of the end head beam 42. By moving and adjusting, the splicing beam 5 is in the central position of the two end head beams 42. The end head beam 42 is also provided with an extension hole 422 that is in communication with the splicing slot 421. By passing a plurality of bolts through the extension hole 422, the splicing beam 5 is locked on the end head beam 42, so that the inner support assembly 3 is spliced to form a complete structure for internal support. In the present application, the inner support assembly 3 adopts a splicing structure, which has better adaptability in the inner support width, can meet the inner support requirements within a certain width range, and can also solve the problem of assembly inconvenience caused by the uneven actual distribution width of the steel sheet piles 11.

[0040] Referring to Figure 2 , Figure 3 , Figure 7 , Figure 8 , Figure 9 and Figure 10, in order to further lock the butt joint end of two adjacent surrounding purlin plates 7, a locking clamp 8 for series locking is inserted between the adjacent surrounding purlin plates 7; it should be noted that the locking clamp 8 corresponds to the steel sheet pile 11 distributed adjacent to the inner groove and away from the foundation pit. The locking clamp 8 comprises a tenon plate 81, a screw rod 82 vertically penetrating and rotatably installed on the tenon plate 81, and a clamping plate 83 movably installed between the horizontal two ends of the tenon plate 81; the two ends of the surrounding purlin plate 7 are symmetrically provided with a mortise 72 for vertical sliding insertion of the tenon plate 81, the screw rod 82 is threadedly connected with a male joint 73, and a female joint 74 is provided with a clearance hole for insertion of the screw rod 82, when the male joint 73 and the female joint 74 are engaged and butt jointed, the screw hole on the male joint 73 and the clearance hole on the female joint 74 are aligned vertically. The horizontal two ends of the tenon plate 81 are symmetrically provided with a sliding groove 811, the clamping plate 83 comprises two sliding blocks 84 movably installed in the two sliding grooves 811, respectively, the top end of each sliding block 84 is welded with a clamping plate 85 in clamping contact with the fence 1, the clamping surface of the clamping plate 85 is roughened, and the two clamping plates 85 are welded with a spring rod 86 made of spring steel material; the mortise 72 is provided with an inclined surface 721, and the inclined surfaces 721 in the two mortises 72 of the surrounding purlin plate 7 are arranged in a spreader shape, and the bottom end of the sliding block 84 is provided with a contact head 841 in contact with the inclined surface 721.

[0041] When assembling the locking clamp 8, the tenon plate 81 is vertically slid and inserted between the two mortises 72, at this time, the tenon plate 81 is matched with the mortise and tenon of the two mortises 72, so that the two surrounding purlin plates 7 cannot be pulled apart in the horizontal direction, achieving the locking effect, then the screw rod 82 is screwed into the male joint 73, the tenon plate 81 is lowered, and the two sliding blocks 84 are in contact with the two inclined surfaces 721 through the contact head 841, the two inclined surfaces 721 act as wedges to promote the two sliding blocks 84 to slide towards each other, and the spring rod 86 is deformed, the two clamping plates 85 are clamped on the steel sheet pile 11, when the tenon plate 81 reaches the bottom of the mortise 72, the screw rod 82 extends into the clearance hole of the female joint 74, and the locking clamp 8 completes the series locking of the two surrounding purlin plates 7, and also indirectly clamps and fixes the surrounding purlin plates 7 on the steel sheet pile 11 as a clamp.

[0042] When the assembly of multiple inner support assemblies 3 and the assembly of two surrounding purlin assemblies 6 are completed, the assembly and splicing of the first layer of inner support is completed. During the process of foundation pit excavation construction, as the depth of downward excavation deepens, the assembly and splicing of the second layer, even the third layer or the fourth layer of inner support structure need to be completed synchronously and sequentially. When the assembly and splicing of the subsequent layer of inner support structure are carried out, the difference is that the end piece 4 needs to be sequentially hung. Specifically, the subsequent end piece 4 is still clamped and tightly attached to the steel sheet pile 11, but the plug-in plate 414 in the end piece 4 at the upper position needs to be plugged into the hanging piece 413 in the end piece 4 at the lower position, and locked by a bolt, so that multiple end pieces 4 are in a sequentially hung and assembled state, and the assembly of the splicing beam and the assembly of the surrounding purlin assembly 6 are exactly the same as the assembly process of the first layer.

[0043] After the culvert foundation and the culvert main body are constructed, the supporting structure can be quickly disassembled. The bolt can be loosened, and the splicing beam 5 can be slid out one by one, so that the splicing beam 5 and the two end pieces 4 are disassembled. Then the pin shaft 43 is pulled out from the positioning hole 71 one by one, the locking between the surrounding purlin plate 7 and the end piece 4 is released, then the screw rod 82 of each locking clamp 8 is loosened one by one, so that the locking clamp 8 is pulled out from between the two surrounding purlin plates 7 to release the locking between the adjacent surrounding purlin plates 7. Then the surrounding purlin plate 7 is pulled out horizontally, then the bolts between the adjacent two end pieces 4 are loosened from bottom to top, then the bolts on the hanging plate 2 are loosened, and in the process of loosening the bolts, the end piece 4 is removed from the steel sheet pile 11 one by one from bottom to top. Finally, the two rows of steel sheet piles 11 are moved upward from the soil layer, so that the complete disassembly of the entire supporting structure is completed.

[0044] Finally, it needs to be supplemented that under the premise of not affecting the final assembly and splicing strength and stability of the supporting structure, the tolerance range of the assembly of parts can be appropriately relaxed to improve the flexibility and feasibility of the actual assembly of each component.

[0045] In the foundation pit support structure provided by the application, the inner support assembly 3 composed of the assembled beam 5 and two end beam 42 is arranged, instead of the existing inner support rod with integral length structure, so that better assembly adaptability is achieved within a certain width range, the assembly mode of the end piece 4 in the vertical distribution in the multi-layer support inner support assembly 3 is sequentially inserted, suspended and overlapped, the mutual series assembly between the plurality of inner support assemblies 3 in the vertical direction is realized, and the top end piece 4 indirectly forms the hanging connection with the steel sheet pile 11 through the hanging plate 2; the surrounding purlin assembly 6 is composed of the surrounding purlin plate 7 in multi-section engagement assembly, the surrounding purlin plate 7 can be positioned and locked on the end piece 4 through the bolt shaft 43, the assembly butt joint between the inner support assembly 3 is realized, the adjacent surrounding purlin plates 7 can be locked and connected through the mortise and tenon matched locking clamp 8, and the clamping and fixing between the surrounding purlin plate 7 and the steel sheet pile 11 can be simultaneously completed, instead of the existing direct welding and welding lug plate connection mode; in summary, the foundation pit support structure provided by the application is based on the fence 1 composed of the steel sheet pile 11, the layer-by-layer suspended, overlapped and locked mode and the multiple matched clamping mode are used to complete the rapid and detachable assembly of the support structure, the vertical sequential hanging connection and the horizontal penetrating series connection are used to form a three-dimensional support frame, the convenience and speed of the support assembly, overlap and disassembly are greatly improved, the difficulty of assembly and disassembly is reduced, the integrity and flexibility of the support structure are improved, the damage and deformation of the support structure itself are avoided or reduced, and the reusability of the support structure is ensured.

[0046] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0047] In the description of the present application, it should be understood that, unless otherwise explicitly specified and limited, the terms "arrangement", "connection", "installation", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] The preferred embodiments of the present application have been described. It is to be understood that the application is not limited to the above specific embodiments, and that devices and structures not described in detail should be understood to be implemented in the ordinary way in the art; any person skilled in the art can make many possible changes and modifications, or modify equivalent embodiments without departing from the technical solutions of the present application, which does not affect the essential content of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical essence of the present application, without departing from the technical solutions of the present application, still belongs to the protection scope of the technical solutions of the present application.

Claims

1. An open cut culvert excavation support structure, characterized by, The utility model relates to a kind of pit support structures, including: Two rows of fences are arranged horizontally and oppositely, and are arranged along the excavation direction at the pit sides of the foundation pit; Two rows of hanging plates are matched with the two rows of fences, and multiple hanging plates in each row are sequentially distributed and overlapped on the top of a single fence; Multiple sets of inner support assemblies are connected between two hanging plates in the two rows of hanging plates that are horizontally opposite, and multiple inner support assemblies in a single set are vertically distributed; the inner support assembly includes two horizontally symmetrical end pieces and an assembly beam detachably assembled and fixed between the two end pieces; Multiple end pieces on the same side in a single set are vertically and sequentially hung and set, and are all clamped on the fence; the top end piece is detachably assembled with the hanging plate and is commonly hung on the top of the fence; Two sets of surrounding purlin assemblies are correspondingly attached to the two rows of fences; Multiple surrounding purlin assemblies in a single set are one-to-one correspondingly arranged with multiple inner support assemblies in the single set; the surrounding purlin assembly includes multiple surrounding purlin plates that are one-to-one correspondingly horizontally slidably inserted into multiple end pieces at the same height and on the same side; adjacent surrounding purlin plates are inserted and matched, and a locking clamp for connecting the two is inserted between adjacent surrounding purlin plates; after the locking clamp is inserted and locked between the adjacent surrounding purlin plates, it can be synchronously clamped on the fence; The surrounding purlin plate is provided with a male joint and a female joint at its horizontal two ends, and the two are mutually engaged and connected at the adjacent two surrounding purlin plates; The locking clamp includes a mortise plate, a screw rod vertically and rotatably installed on the mortise plate, and a clamping plate movably installed between the horizontal two ends of the mortise plate; the two ends of the surrounding purlin plate are symmetrically provided with a mortise slot for vertically sliding insertion of the mortise plate, and the screw rod is threadedly connected with the male joint; when the mortise plate is inserted between the mortise slots of the adjacent two surrounding purlin plates and the screw rod is screwed in, the clamping plate is synchronously driven to clamp the fence; The clamping plate includes two sliders horizontally and oppositely slidably installed on the two sides of the mortise plate, the top ends of the two sliders are fixed with clamping plates that are clamped in contact with the fence, and a spring rod is fixed between the two clamping plates; the mortise slot is provided with a slope surface, and the slope surfaces in the two mortise slots of the surrounding purlin plate are arranged in a figure-of-eight pattern, and the bottom end of the slider is provided with a contact head in contact with the slope surface.

2. The open cut culvert excavation support structure according to claim 1, wherein: The end piece includes a hanging seat and an end beam fixed horizontally on the hanging seat, the hanging seat is clamped on the fence, the hanging seat can be hung on the hanging plate, and multiple hanging seats can be vertically and sequentially hung and assembled; the surrounding purlin plate is inserted through the hanging seat; the assembly beam is assembled and connected at the two horizontally opposite end beams.

3. An open cut culvert excavation support structure according to claim 2, wherein: The hanging seat includes a slot seat slidably inserted and matched with the surrounding purlin plate, the slot seat is fixed with two upper and lower clamping plates, the two clamping plates are clamped on the fence, the top end of the upper clamping plate is fixed with a hanging piece, the bottom end of the lower clamping plate is fixed with an insertion plate, and the hanging plate and the insertion plate can be inserted and matched with the hanging piece; the end beam is fixed horizontally on the slot seat, and the hanging piece and the insertion plate are arranged towards the end beam.

4. A structure for supporting the sides of an open cut tunnel excavation according to claim 3 wherein: The end beam is axially slidably installed with a latch shaft, the latch shaft continuously penetrates the end beam and the slot seat, and the surrounding purlin plate is provided with a positioning hole for insertion of the latch shaft.

5. The open cut culvert excavation support structure according to claim 1, wherein: The hanging plate is in the form of an L-shaped plate, and a knife edge is formed at the lower end of the vertical plate portion of the hanging plate.

6. A structure for supporting the sides of an open cut tunnel excavation according to claim 2 wherein: The end beam is provided with an assembling slot for horizontal movement and insertion of the assembling beam at one end away from the hanging seat, and the long side wall end of one side of the assembling beam is provided with a limiting stop edge for assembling positioning.

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