A device for increasing prestress of a fish-bellied beam

Abstract

The application discloses a device for increasing prestress of a fish-belly beam and belongs to the field of foundation pit engineering support, which comprises a triangular key, a steel strand, a surrounding purlin, a rectangular steel support beam, a scissors support, an arc-shaped steel beam, a straight web member, an end connecting component, a concrete cushion plate, an anchoring device, a fastening device, an inclined web member, a rotating shaft device, a cross beam, a connecting device, a clamping groove, a semicircular connecting piece, a rectangular cushion plate, a stiffening plate, a locked steel strand anchorage device, a prestress locking device, an angle rotating disc, a tension component, a rotating rod and a steel pipe and the like equipment. The application can adjust the angle change of a large-span prestress fish-belly beam foundation pit support during construction, connects the surrounding purlin and the web member through the connecting device, the clamping groove, the semicircular connection at the end of the inclined web member, and effectively controls the stress of the foundation pit support. The application further increases a component for preventing the fish-belly beam from lowering, which is arranged at a certain position outside the fish-belly beam; the application can ensure safety and reliability, flexibly arrange the support structure, clearly bear the stress, and effectively control the deformation of the foundation pit.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of foundation pit engineering support, and relates to a prestressed fish-belly beam device. BACKGROUND

[0002] With the continuous expansion of the city scale, the relevant specifications and construction technologies of the construction industry are relatively perfect, high-rise and super high-rise buildings are rising, and the available ground space is increasingly tense, so the city construction changes to the underground space becomes an inevitable trend.

[0003] In order to meet the demand of city land space, the foundation pit engineering develops in the direction of deep excavation, large area and complex surrounding environment. Due to the limitation of relevant laws and regulations and the complex surrounding environment of the construction site, the pile anchor support application is hindered, and the internal support support becomes the main form of the current foundation pit support. Although the traditional concrete foundation pit support has a long maintenance time and can control the deformation requirements of the foundation pit excavation, it also has some shortcomings. For example, in the current reinforced concrete support or steel support supported foundation pit, the distribution of the bracing, angle bracing and column is dense, which leads to a small construction space, brings great difficulty to the excavation and earthmoving of the foundation pit, and the construction efficiency is affected. Moreover, the concrete support needs to be removed by using the pre-prepared blasting method, and a large amount of garbage is left, which does not meet the policy guidance of the green energy-saving and environment-friendly support of the construction industry advocated by the state.

[0004] Compared with the traditional internal support support system, the prestressed fish-belly beam type steel support structure can save certain cost, has fast installation and removal, large excavation and basement construction space, can save part of the construction period, dynamically applies prestress, effectively controls the deformation and settlement of the foundation pit, is processed in a factory, is constructed by professional workers, is strictly managed, does not need large machinery, has a large construction space for earthwork and underground structure, and more than 95% of the removed steel supports can be fully reused, which is energy-saving and environment-friendly. SUMMARY

[0005] The purpose of the application is to provide a fish-belly beam structure for optimizing the stress of foundation pit support, the installation of the steel beam can reduce the number of steel strands, the scissors support can flexibly adjust the support angle, control the distance between the rectangular steel support beams, the fish-belly beam web can be easily disassembled and reused in the deep foundation pit support structure, and the technical problems to be solved are that the deep foundation pit support structure in the prior art cannot meet the requirements of large construction operation space in the foundation pit, the web angle can be flexibly controlled, and the purpose of convenient construction is achieved.

[0006] Technical solution: The present invention proposes a fish belly beam device for increasing prestress, which includes a triangular key, a steel strand, a plurality of bolts, a purlin, a rectangular steel support beam, a plurality of scissors struts of different lengths, an arc-shaped steel beam, a plurality of straight web members, an end connecting member, a concrete pad, an anchoring device, a fastening device, a plurality of diagonal web members, a rotating shaft device, a crossbeam, a connecting device, a slot, a semicircular connecting piece, a rectangular pad, a stiffening plate, a locking steel strand anchor, a prestressed locking device, an angle turntable, a tension member, a rotating rod, and a steel pipe. The steel strands pass through the rectangular steel support beams and are connected to the prestressed tensioning locking device inside the triangular key. The rectangular steel support beams are symmetrically arranged parallel to the left and right sides of the straight webs. One end is a U-shaped groove with two circular holes that can just hold the curved steel beams. The ends are fixed with bolts. The other end is an arc-shaped component with a serrated middle part, which is appropriately bent along the direction of the steel strands. There are two rows of rectangular slots in the middle of the side of the rectangular steel support beam. Some of the scissors struts are of different lengths, and their ends have four stable clips that match the rectangular slots. The support angle is adjusted by the circular rotating shaft in the middle. The curved steel beam passes through the end connecting component of the straight web, and its two ends are inserted through and extend out of the purlin and concrete pad. They are fixed by the anchoring device. The curved steel beam is symmetrically provided with several straight webs of different lengths and fixedly connected to the purlin. Some of the straight webs are provided with eight-shaped diagonal webs on both sides, and the lower ends of some of the diagonal webs are rotatably connected to the purlin through the connecting device. The angle dial is a cylinder with eight transparent circular holes around its outer perimeter on its upper surface. A threaded hole is located at the center of its lower surface, half the depth of the cylinder. A rectangular hole is located in the middle of the side of the angle dial, corresponding in height to the circular hole, and is deeper than the inner portion of the hole. The tension member has a U-shaped hook at one end and a circular hole at the center of its inner portion at the other end, the size of which matches the circular holes around the angle dial. The top of the rotating rod has external threads, and the threaded hole on the inner side of the angle dial connects to the rotating rod. Several transparent circular holes are arranged along the same length of the rotating rod. The bottom of the rotating rod is connected to a steel pipe. The inner wall of the steel pipe is sized to fit the diameter of the rotating rod and has a conical lower end. The corresponding hole on the steel pipe has a circular hole of the same size. When the steel pipe and the rotating rod are extended and retracted to correspond to the circular holes on the same plane, they can be fixed with a pin to adjust the length of the rotating rod.

[0007] Furthermore, the perimeter purlins, straight web members, diagonal web members, triangular keys and cross beams are all composed of H-shaped steel.

[0008] Furthermore, the rectangular steel support beams, scissors support and buckles are all high-strength components.

[0009] Furthermore, the rectangular steel support beam has one end with serrations, and arc-shaped grooves are formed between the serrations.

[0010] Further, the steel strand is composed of 3 or more steel wires, and has the characteristics of high strength, low relaxation and easy anchoring.

[0011] Further, the scissors support can adjust the angle by selecting different length components, and can be moved along the direction of the rectangular steel support beam according to the position of the clamping groove, and can be appropriately increased or decreased according to requirements.

[0012] Further, the connecting device comprises a U-shaped connecting device, an arc-shaped connecting hole, a rotating shaft component and a clamping groove, the upper and lower ends of the U-shaped connecting device are placed in parallel on the upper and lower flanges of the inclined web member, and the two are fixed by two clamping grooves, so as to facilitate the connection of the inclined web member and the surrounding purlin.

[0013] Further, the U-shaped connecting device has a hole in one side of the rectangular component, and is placed in parallel between two arc-shaped connecting holes, the two arc-shaped connecting holes are welded in parallel on the rectangular pad in the vertical direction, the rotating shaft component passes through the hole in the rectangular component of the U-shaped connecting device and the arc-shaped connecting hole, the rotating shaft component is connected by two cylindrical nests with different diameters and two spheres, the spherical device in the rotating shaft component is located between the outer cylindrical and the arc-shaped connecting hole, so as to facilitate rolling and reduce friction.

[0014] Further, the surface of the rolling shaft device is smooth.

[0015] Further, the arc-shaped guide pipe is sprayed with high-strength concrete inside the ordinary steel pipe component, so as to increase the overall strength of the component.

[0016] Further, the component for preventing the fish-belly beam from lowering is placed at a certain position outside the fish-belly beam, so that one end of the tension component with a U-shaped hook hooks the steel beam. The hole in the side surface of the angle disc is used to connect with the tension component, and when the hole of the tension component is inserted into the angle disc and the circular holes are aligned, the two are fixed by a pin. The rotating rod can be fixed by a pin at the corresponding position of the hole during the process of lifting up and down in the steel pipe, so as to the length of the steel pipe. The lower end of the steel pipe is conical to facilitate insertion into the soil body.

[0017] Advantages: Compared with the prior art, the characteristics of the present application are: 1. The web angle in the present application can be adjusted left and right; the adjustability of the web angle can realize the active control of the fish-belly beam support on the deformation of the foundation pit; coordinate the balance between the foundation pit excavation, dewatering and the pile load and soil pressure; 2. The arc-shaped steel beam in the present application can reduce the number of tensioned steel strands, reduce the friction between the steel strands caused by tensioning and make the prestress loss; 3. The fish-belly beam in the present application can realize factory prefabrication and on-site assembly, and can be recycled and reused, which is an economical and efficient, green and environmentally friendly support system. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1is the overall planar schematic diagram of the fish-bellied beam device in the present application;

[0019] Figure 2 is the three-dimensional structural schematic diagram of the fish-bellied beam device in the present application;

[0020] Figure 3 is the enlarged view of the end connecting member in the present application;

[0021] Figure 4 is the connection schematic diagram of the rectangular steel bracing beam and the scissors brace in the present application;

[0022] Figure 5 is the structural schematic diagram of the scissors brace in the present application;

[0023] Figure 6 is the connection schematic diagram of the steel beam end in the present application;

[0024] Figure 7 is the connection diagram of the connecting device and the semicircular connecting piece in the present application;

[0025] Figure 8 is the connecting device diagram in the present application;

[0026] Figure 9 is the rotating shaft device diagram in the present application;

[0027] Figure 10 is the semicircular connecting piece and steel plate connection diagram in the present application;

[0028] Figure 11 is the member schematic diagram for preventing the fish-bellied beam from lowering in the present application;

[0029] In the figure, 1 is a triangular key, 2 is a steel strand, 3 is a bolt, 4 is a surrounding purlin, 5 is a rectangular steel bracing beam, 6 is a scissors brace, 6-1 is a stable buckle, 6-2 is a circular rotating shaft, 7 is an arc-shaped steel beam, 8 is a straight web, 9 is an end connecting member, 11 is an anchoring device, 12 is a fastening device, 13 is an inclined web, 13-1 is an upper flange, 13-2 is a lower flange, 14 is a rotating shaft device, 14-1 is a cylindrical nest, 14-2 is an outer cylindrical, 14-3 is a spherical, 15 is a cross beam, 16 is a connecting device, 16-1 is a U-shaped connecting device, 16-2 is a rectangular member, 16-3 is a circular hole, 17 is a clamping groove, 18 is a semicircular connecting piece, 18-1 is a circular hole, 19 is a rectangular pad, 20 is a stiffened plate, 21 is a locking steel strand anchor, 22 is a prestressed locking device, 23 is a member for preventing the fish-bellied beam from lowering, 23-1 is an angle dial, 23-2 is a tension member, 23-3 is a rotating rod, 23-4 is a steel pipe. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the technical solution of the present invention, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings:

[0031] As shown in the figure, the fish belly beam device for increasing prestressing of the present invention includes a triangular key 1, a steel strand 2, a plurality of bolts 3, a purlin 4, a rectangular steel support beam 5, a plurality of scissors struts 6 of different lengths, a stabilizing buckle 6-1, a circular rotating shaft 6-2, an arc-shaped steel beam 7, a plurality of web members 8, an end connecting member 9, a concrete pad, an anchoring device 11, a fastening device 12, a plurality of diagonal web members 13, an upper flange 13-1, a lower flange 13-2, a rotating shaft device 14, a crossbeam 15, a connecting device 16, a U-shaped connecting device 16-1, a rectangular member 16-2, a circular hole 16-3, a slot 17, a semicircular connecting member 18, a rectangular pad 19, a stiffening plate 20, a locking steel strand anchor 21, a prestressed locking device 22, a member 23 for preventing the fish belly beam from lowering, an angle turntable 23-1, a tension member 23-2, a rotating rod 23-3 and a steel pipe 23-4.

[0032] like Figures 1-8 As shown, the triangular key 1, the purlin 4, the crossbeam 15, the straight web 8 and the diagonal web 13 are all made of H-shaped steel, and the web is placed parallel to the ground; wherein, the purlin 4 is connected by double-joined flanges of H-shaped steel, and in order to increase the strength, dense stiffening plates 20 are welded inside the H-shaped steel, and supporting structures are installed at the position where support is required, and the purlin 4 is hoisted to the support position and fixed.

[0033] The triangular key 1 is an isosceles right triangle, one right-angled side of which is provided with an inlet for the steel strand 2, and its hypotenuse is connected to the purlin 4 with bolts 3, and a locking steel strand anchor 21 and a prestressed locking device 22 for tensioning the steel strand 3 are provided inside.

[0034] Figure 1 The steel strand 2 is composed of more than three steel wires with a diameter of 15.2 mm, and has the advantages of high strength, low relaxation and easy anchoring. The steel strand 2 must not cross when passing through the arc groove at the end of the rectangular steel support beam 5, and the end enters the steel strand 2 entrance reserved by the triangular key 1. The steel strand 2 is connected to the purlin 4 to form a closed structure; the prestressing of the steel strand 2 is applied by tensioning each strand with a through-type jack and locking it with a self-locking toothed clip.

[0035] Figure 1 and Figure 2 First, several of the eight-shaped diagonal web members 13 on both sides of the straight web members 8 are spliced ​​on the ground to facilitate stability, and pads 19 are placed on the upper part of the straight web members 8 near the flange and connected to the cross beam 15 with bolts 3 to make the fish belly beam more stable. The end connecting member 9 commonly used in engineering is installed on the top, and the bottom end is connected to the purlin 4 with bolts 3.

[0036] Figure 1 and Figure 4 The rectangular steel support beam 5 is symmetrically and parallelly arranged on both sides of the straight web 8, and different models are selected at different positions. One end of the rectangular steel support beam 5 is a U-shaped groove containing two circular holes, which can just hold the arc-shaped steel beam 7, and the end is fixed by a bolt 3. The other end is an arc-shaped member with a sawtooth shape in the middle, which has appropriate bending in the direction of the steel strand 2. There are two rows of rectangular clamping grooves 17 in the middle of the side surface of the rectangular steel support beam 5. Then several scissors supports 6 with different lengths are arranged, and the end has four stable buckles matched with the rectangular clamping grooves, and the support angle is adjusted by the circular rotating shaft in the middle. The rectangular steel support beam 5 is symmetrically and parallelly arranged on both sides of the straight web 8, and different models are selected at different positions. One end of the rectangular steel support beam 5 is a U-shaped groove containing two circular holes, which can just hold the arc-shaped steel beam 7, and the end is fixed by a bolt 3. The other end is an arc-shaped member with a sawtooth shape in the middle, which has appropriate bending in the direction of the steel strand 2. There are two rows of rectangular clamping grooves 17 in the middle of the side surface of the rectangular steel support beam 5. Then several scissors supports 6 with different lengths are arranged, and the end has four stable buckles matched with the rectangular clamping grooves, and the support angle is adjusted by the circular rotating shaft in the middle. The straight web 8 is connected to the surrounding purlin 4 at one end by a bolt 3, and connected to the commonly used end connecting member 9 at the other end.

[0037] Figure 1 and Figure 2 The arc-shaped steel beam 8 is embedded in the end connecting member 9 connected to the top of the straight web 9, and the two ends are inserted into and protrude from the surrounding purlin 4 and the concrete pad 11. Now the fastening device 13 is sleeved on the protruding end of the arc-shaped steel beam, gradually approaching the concrete pad 11, and then the anchoring device 12 is sleeved into the arc-shaped steel beam 8 close to the fastening device 13 for fixation.

[0038] Figure 4 and Figure 5 The connecting device 16 includes a U-shaped connecting device 16-1, a rectangular member 16-2, and a circular connecting hole 16-3. The upper and lower ends of the U-shaped connecting device 16-1 are respectively parallelly arranged outside the upper flange 13-1 and the lower flange 13-2 of the inclined web 13, and the two are fixed by the two clamping grooves 18 at a certain distance, facilitating the connection of the inclined web 14 and the surrounding purlin 4.

[0039] Figure 5 , Figure 7 and Figure 8The rectangular member 16-2 at the top of the U-shaped connecting device 16-1 has a circular hole 16-3, and is placed in parallel between the two semicircular connecting plates 19. The two semicircular connecting members 18 have a circular hole 18-1 in the middle and are welded in parallel to the rectangular pad 19 in the vertical direction. The circular hole 16-3 in the rectangular member of the U-shaped connecting device 16-1 and the circular hole 18-1 in the middle of the semicircular connecting member 18 are aligned vertically. The rotating shaft device 14 passes through the circular hole 16-3 in the rectangular member of the U-shaped connecting device 16-1 and the circular hole 18-1 in the middle of the semicircular connecting member 18. The rotating shaft device 14 is composed of two cylindrical nests with different diameters and two spheres. The spherical device in the rotating shaft device 14 is located on the outside of the cylindrical nest and the lower part of the circular hole 18-1 in the middle of the semicircular connecting member 18, with a smooth surface for easy rolling and reduced friction.

[0040] Figure 11 The angle disc 23-1 is a cylinder with eight through holes around the outer surface of the upper surface. There is a threaded hole in the center of the lower surface of the angle disc 23-1, and the depth of the threaded hole is half the height of the cylinder.

[0041] There is a rectangular hole in the middle of the side of the angle disc 23-1, which communicates with the circular hole and has a depth exceeding the inner side of the circular hole.

[0042] One end of the tension member 23-2 is a U-shaped hook for hooking the arc-shaped steel beam 7 to prevent the fish belly beam from lowering due to the length of the straight web 8. The other end has a circular hole in the middle of the inner side, which is the same size as the circular hole around the angle disc 23-1. When the hole end of the tension member 23-2 is inserted into the angle disc 23-1, the circular holes are aligned vertically and fixed with a pin.

[0043] The rotating rod 23-3 has external threads at the top end, and the threaded hole in the inner side of the angle disc 23-1 is connected to the rotating rod 23-3. There are several through holes arranged on the same side of the length direction of the rotating rod 23-3.

[0044] The rotating rod 23-3 is connected to a steel pipe 23-4 at the bottom. The inner wall of the steel pipe 23-4 is the same size as the diameter of the rotating rod 23-3 with a gap and the lower end is conical. The position corresponding to the circular hole of the rotating rod 23-3 on the steel pipe 23-4 is also a circular hole of the same size. When the steel pipe 23-4 and the rotating rod 23-3 are extended to the same plane corresponding to the circular hole, they can be fixed with a pin to adjust the length of the rotating rod 23-3.

Claims

1. A fish beam device for increasing prestress, characterized in that: It comprises a triangular key (1), a steel strand (2), a web (8), an end connecting member (9), an anchoring device (11), a fastening device (12), a plurality of diagonal webs (13), a rotating shaft device (14), a crossbeam (15), a connecting device (16), a clamping groove (17), a semicircular connecting member (18), a rectangular pad (19), a stiffening plate (20), a locking steel strand anchor (21), a prestressed locking device (22) and a member for preventing the fish belly beam from lowering its head (23); Wherein, a purlin (4) is arranged at the lower end of the triangular key (1) and the steel strand (2). The triangular key (1) is symmetrically arranged on both sides of the steel strand (2), and the triangular key (1) and the steel strand (2) are movably connected through the surrounding purlin (4) and the inserted bolts (3). A rectangular steel support beam (5) is installed at the middle and upper end of the steel strand (2). Prestressed locking devices (22) are installed on the inner sides of the triangular keys (1) on both sides. The steel strand (2) passes through the rectangular steel support beam (5) and is connected to the prestressed locking device (22) inside the triangular key (1); A locking steel strand anchor (21) is arranged inside the triangular key (1); A plurality of straight web members (8) are evenly distributed between the rectangular steel support beam (5) and the surrounding purlin (4). A plurality of scissor braces (6) of varying lengths are installed in the rectangular steel support beam (5); The rectangular steel support beam (5) is symmetrically arranged in parallel on the left and right sides of the straight web member (8). One end of the U-shaped groove contains two circular holes, and an arc-shaped steel beam (7) is fixed in the U-shaped groove. The ends of the beams are fixedly connected by installed bolts (3). The other end of the U-shaped groove is an arc-shaped component with a sawtooth shape in the middle. The steel strands (2) pass parallel to each other between the serrations of the arc-shaped member in the horizontal direction; Two rows of rectangular slots are also provided in the middle of the side of the rectangular steel support beam (5); Four stabilizing buckles (6-1) adapted to the rectangular slots are installed at the ends of the scissor struts (6), and the stabilizing buckles are used to adjust their support angles via a circular rotating shaft (6-2) installed in the middle. The straight web members (8) are all supported by the installed cross beams (15), and an end connecting member (9) is installed on the upper part thereof. A plurality of oblique web members (13) with an inclination angle and in the shape of an eight are symmetrically installed on both sides of the lower part of the middle part. One end of the straight web (8) is connected to the scissors strut (6) via an end connecting member (9). The other end is connected to the purlin (4) via bolts (3); An arc-shaped steel beam (7) is passed through the end connecting member (9). The two ends of the arc-shaped steel beam (7) are inserted into and extended into the purlin (4) and the concrete pad extending therefrom after passing through the end connection member (9), and are fixed by the installed anchoring device (11) and the fastening device (12); The diagonal web member (13) comprises an upper flange (13-1) and a lower flange (13-2); The lower ends of the plurality of diagonal web members (13) are adjusted in angle through a rotating shaft device (14) and connected to the surrounding purlin (4); A connecting device (16) is installed on the outer wall of the diagonal web member (13). The connecting device (16) comprises a U-shaped connecting device (16-1), a rectangular component (16-2) connected to the outer wall of the U-shaped connecting device (16-1), and a circular hole (16-3) is also provided through the rectangular component (16-2); The upper and lower ends of the U-shaped connecting device (16-1) are respectively placed parallel to the outer walls of the upper flange (13-1) and the lower flange (13-2) of the diagonal web member (13), and are fixed via two clamping grooves (17); A rectangular pad (19) is installed on the other side of the connecting device (16), and the rectangular pad (19) is connected to the stiffening plate (20) by a plurality of bolts (3) passing through the pad; Two semicircular connecting members (18) are installed on the rectangular pad (19), and two circular holes (18-1) adapted to the circular holes (16-3) are opened on the semicircular connecting members (18). A rotating shaft device (14) is provided through the circular hole (16-3) and the circular hole (18-1). The rotating shaft device (14) is composed of two cylindrical nests (14-1) with different diameters at both ends, an outer cylindrical shape (14-2) in the middle, and two spherical shapes (14-3). The two spherical bodies (14-3) are installed at the lower part of the circular hole (18-1) opened between the outer column (14-2) and the semicircular connecting member (18); A fish beam lowering prevention member (23) is also installed on the web (8), and the fish beam lowering prevention member (23) includes an angle rotating disk (23-1). The angle turntable (23-1) is cylindrical in shape, and has at least 8 circular holes around its upper surface. A threaded hole is provided at the center of the lower surface of the angle rotating disk (23-1), wherein the depth of the threaded hole is half of the depth of the angle rotating disk (23-1); A rectangular hole communicating with the circular hole is provided at a position in the middle of the side surface of the angle rotating disk (23-1) at a height corresponding to the circular hole; A tension member (23-2) is arranged on one side of the angle rotating disk (23-1), a U-shaped hook is arranged at one end of the tension member (23-2), and a circular hole is arranged at the inner middle position of the other end thereof, the size of the circular hole being consistent with the size of the circular holes around the angle rotating disk (23-1); A rotating rod (23-3) is also connected to the angle rotating disk (23-1), an external thread is provided at the top end of the rotating rod (23-3), a threaded hole inside the angle rotating disk (23-1) is connected to the rotating rod (23-3), and a plurality of transparent circular holes are arranged on the same side of the rotating rod (23-3) in the longitudinal direction; A steel pipe (23-4) connected to the rotating rod (23-3) is installed at the bottom thereof; the inner wall of the steel pipe (23-4) is in clearance with the diameter of the rotating rod (23-3), and the lower end is conical; A circular hole of equal size is provided on the steel pipe (23-4) at a position corresponding to the circular hole on the rotating rod (23-3); When the steel pipe (23-4) and the rotating rod (23-3) are extended and retracted to correspond to the circular hole in the same plane, a pin for fixing the steel pipe (23-4) and the rotating rod (23-3) is installed in the circular hole.

Images