Prefabricated steel bracket support device for foundation pit retaining and its construction method

Abstract

The present invention discloses an assembled steel corbel support device for foundation pit enclosure and a construction method thereof, aiming to provide an assembled steel corbel support device for foundation pit enclosure and a construction method thereof, which is not only convenient for installation and construction operation and can improve the installation and construction efficiency; but also is conducive to improving the accuracy of the installation position, so as to facilitate the stress of the support system. The assembled steel corbel support device for foundation pit enclosure comprises: a prefabricated corbel, the prefabricated corbel comprises a support rod and an oblique support rod located below the support rod, the upper end of the oblique support rod is connected to the support rod; a preset upper mounting piece, the preset upper mounting piece is welded and connected to the steel column of the retaining pile of the foundation pit, and one end of the support rod is connected to the preset upper mounting piece by an upper bolt; a preset lower mounting piece, the preset lower mounting piece is located below the preset upper mounting piece, the preset lower mounting piece is welded and connected to the steel column of the retaining pile of the foundation pit, and the lower end of the oblique support rod is connected to the preset lower mounting piece by a lower bolt.

Description

Technical Field

[0001] The invention relates to the field of foundation pit enclosure, and in particular to an assembled steel bracket support device for foundation pit enclosure and a construction method thereof. Background Art

[0002] In order to ensure the safety of underground structures and the surrounding environment of foundation pits, it is necessary to adopt support, reinforcement and other protective measures on the side walls and surrounding areas of the foundation pit. The current foundation pit support system usually includes a circle of foundation pit retaining piles set around the edge of the foundation pit, steel enclosures set in the retaining piles, steel triangles fixed on the inside of the steel enclosures, and steel inner support beams supported between the steel enclosures by steel triangles. Due to the heavy weight of steel triangles, conventional angle steel brackets cannot bear the load of steel triangles, so steel brackets are needed to bear the load.

[0003] The current steel corbel is composed of a horizontal beam and a diagonal brace, and both the horizontal beam and the diagonal brace are composed of H-shaped steel. When constructing the steel corbel, the horizontal beam is first welded horizontally to the steel column of the retaining pile, and then the upper end of the diagonal brace is welded to the horizontal beam, and the lower end of the diagonal brace is welded to the steel column of the retaining pile; at the same time, it should be ensured that the diagonal brace and the horizontal beam are at a set angle, for example, 45 degrees. The current structure and construction method of this type of steel corbel has the following shortcomings: since the horizontal beam and the diagonal brace are both composed of H-shaped steel, they are heavy, and not only is it inconvenient to operate when welding the horizontal beam and the diagonal brace; but also the positions of the horizontal beam and the diagonal brace are difficult to accurately locate, and the welding angle of the diagonal brace (45 degrees) is also difficult to control, which is not conducive to the force of the support system. Summary of the invention

[0004] The purpose of the present invention is to provide an assembled steel corbel support device for foundation pit enclosure and its construction method which is not only convenient for installation and construction operation and can improve installation and construction efficiency, but also helps to improve the accuracy of the installation position, so as to facilitate the support system to bear the stress.

[0005] The technical solution of the present invention is:

[0006] An assembled steel bracket support device for foundation pit enclosure, comprising:

[0007] Prefabricated corbels, the prefabricated corbels include a support rod and an oblique support rod located below the support rod, and the upper end of the oblique support rod is connected to the support rod;

[0008] A preset upper mounting piece is welded to a steel column of a retaining pile of a foundation pit, and one end of the support rod is connected to the preset upper mounting piece by an upper bolt;

[0009] A preset lower mounting piece is located below the preset upper mounting piece, the preset lower mounting piece is welded to the steel column of the retaining pile of the foundation pit, and the lower end of the diagonal brace is connected to the preset lower mounting piece through a lower bolt.

[0010] During the specific installation and construction of the assembled steel corbel support device for foundation pit retaining of the present scheme, the preset upper mounting parts are welded and connected to the steel columns of the retaining piles of the foundation pit, and the preset lower mounting parts are welded and connected to the steel columns of the retaining piles of the foundation pit. Since the preset upper mounting parts and the preset lower mounting parts are used to install the prefabricated corbels, their volume and mass are small, which is convenient for on-site positioning and welding, and the welding quality can be guaranteed when the lighter preset upper mounting parts and the preset lower mounting parts are welded to the steel columns; then, the prefabricated corbels made in the factory are directly installed on the preset upper mounting parts and the preset lower mounting parts through upper bolts and lower bolts. In this way, not only the installation and construction operation of the assembled steel corbel support device for foundation pit retaining is convenient, which can improve the installation and construction efficiency; it is also beneficial to improve the installation position accuracy of the assembled steel corbel support device for foundation pit retaining, so as to facilitate the force of the support system.

[0011] Preferably, the preset upper mounting part includes an upper mounting plate, the upper mounting plate is provided with bolt connection holes, the support rod is composed of H-shaped steel, the web of the H-shaped steel constituting the support rod is provided with bolt connection holes, and the bolt connection holes on the support rod are close to one end of the support rod, and the upper bolt passes through the upper mounting plate and the bolt connection holes on the support rod to connect one end of the support rod with the preset upper mounting part as a whole. In this way, it is convenient to connect one end of the support rod with the preset upper mounting part through the upper bolt, and it is beneficial to improve the connection stability between one end of the support rod and the preset upper mounting part.

[0012] Preferably, the cross-section of the preset upper mounting part is L-shaped, which is composed of the upper mounting plate and the upper welding plate. The upper mounting plate and the upper welding plate are an integrally formed structure, and the upper welding plate is welded to the steel columns of the retaining piles of the foundation pit.

[0013] Preferably, the cross-section of the preset upper mounting part is T-shaped, which is composed of the upper mounting plate and the upper welding plate. The upper mounting plate and the upper welding plate are an integrally formed structure, and the upper welding plate is welded to the steel columns of the retaining piles of the foundation pit.

[0014] Preferably, the preset lower mounting part includes a lower mounting plate, the lower mounting plate is provided with bolt connection holes, the diagonal brace is composed of H-shaped steel, the web of the H-shaped steel constituting the diagonal brace is provided with bolt connection holes, and the bolt connection holes on the diagonal brace are close to the lower end of the diagonal brace, the lower bolts pass through the lower mounting plate and the bolt connection holes on the diagonal brace, and the lower end of the diagonal brace is connected to the preset lower mounting part as a whole. In this way, it is convenient to connect one end of the diagonal brace with the preset lower mounting part through the lower bolts, and it is beneficial to improve the connection stability between one end of the diagonal brace and the preset lower mounting part.

[0015] Preferably, the cross-section of the preset lower mounting part is L-shaped, which is composed of the lower mounting plate and the lower welding plate. The lower mounting plate and the lower welding plate are an integrally formed structure, and the lower welding plate is welded to the steel columns of the retaining piles of the foundation pit.

[0016] Preferably, the cross-section of the preset lower mounting part is T-shaped, which is composed of the lower mounting plate and the lower welding plate. The lower mounting plate and the lower welding plate are an integrally formed structure, and the lower welding plate is welded to the steel columns of the retaining piles of the foundation pit.

[0017] Preferably, the upper end of the diagonal brace is connected to the support rod by welding or bolts.

[0018] A construction method of an assembled steel bracket support device for foundation pit enclosure, characterized in that it comprises the following steps:

[0019] First, the corbel is prefabricated, and the upper end of the diagonal brace is connected to the support rod by welding;

[0020] Second, the preset upper mounting parts are installed with the preset lower mounting parts, the preset upper mounting parts are welded to the steel columns of the retaining piles of the foundation pit, and the preset lower mounting parts are welded to the steel columns of the retaining piles of the foundation pit;

[0021] Third, one end of the support rod is connected to the preset upper mounting piece through an upper bolt; and the lower end of the diagonal support rod is connected to the preset lower mounting piece through a lower bolt.

[0022] Preferably, when the preset upper mounting part and the preset lower mounting part are installed in the second step, an auxiliary mounting device is used for installation, and the auxiliary mounting device includes a transverse adjustment plate, a vertical mounting plate connected to the transverse adjustment plate at the upper end, two adjustment devices arranged on the transverse adjustment plate, two lifting ropes corresponding to the adjustment devices one by one, and an upper hole group and a lower hole group arranged on the vertical mounting plate. The adjustment device includes a vertical guide sleeve arranged on the transverse adjustment plate, a sliding column slidably arranged in the vertical guide sleeve, a lifting rope through hole passing through the upper and lower end surfaces of the sliding column, an upper baffle plate and a lower baffle plate arranged on the sliding column, a pre-tightening compression spring sleeved on the sliding column, and a pre-tightening compression spring sleeved on the lower baffle plate. The vertical adjustment bolt on the plate, the upper baffle is located above the transverse adjustment plate, the pre-tightening compression spring is located between the upper baffle and the transverse adjustment plate, the lower baffle is located below the vertical guide sleeve, the upper end of the vertical adjustment bolt is against the lower surface of the transverse adjustment plate, the upper end of the lifting rope is provided with a hook, the lifting rope passes through the corresponding lifting rope through hole of the auxiliary installation device, and the sliding column is also provided with a locking bolt for locking the lifting rope, the vertical mounting plate is perpendicular to the transverse adjustment plate, the upper hole group includes a plurality of upper mounting holes for connecting a preset upper mounting member, the lower hole group is located below the upper hole group, and the lower hole group includes a plurality of lower mounting holes for connecting a preset lower mounting member;

[0023] The specific steps of installing the preset upper mounting member and the preset lower mounting member in the second step are as follows:

[0024] (1) Install the preset upper mounting member on the upper mounting hole of the upper hole group through connecting bolts, and install the preset lower mounting member on the lower mounting hole of the lower hole group through connecting bolts, so as to pre-install the preset upper mounting member and the preset lower mounting member on the vertical mounting plate;

[0025] (2) Hang the hooks at the upper ends of the two lifting ropes on the upper ends of the steel columns, so that the auxiliary installation device is hung below the upper ends of the steel columns. At this time, the preset upper installation parts and the preset lower installation parts are pre-abutted against the outer surface of the steel columns; then, loosen the locking bolts on the two adjustment devices, lower the horizontal adjustment plate, the vertical installation plate, the preset upper installation parts and the preset lower installation parts to the specified height, and then lock the locking bolts on the two adjustment devices; then, adjust the vertical adjustment bolts on the two adjustment devices to level the horizontal adjustment plate so that the horizontal adjustment plate is in a horizontal state, thereby making the vertical installation plate in a vertical state;

[0026] (3) The preset upper mounting parts are welded to the steel columns of the retaining piles of the foundation pit, and the preset lower mounting parts are welded to the steel columns of the retaining piles of the foundation pit.

[0027] Although the preset upper mounting parts and the preset lower mounting parts are small in size and mass, which are convenient for on-site positioning and welding; however, in actual operation, there are still problems such as inconvenient on-site positioning of the preset upper mounting parts and the preset lower mounting parts and inaccurate positioning. In order to solve this problem, the inventor has designed an auxiliary mounting device to position the preset upper mounting parts and the preset lower mounting parts, so as to facilitate on-site positioning of the preset upper mounting parts and the preset lower mounting parts and ensure the accuracy of the positioning position and orientation. Specifically, the preset upper mounting parts are installed on the upper mounting holes of the upper hole group by connecting bolts, and the preset lower mounting parts are installed on the lower mounting holes of the lower hole group by connecting bolts, thereby ensuring the preset upper mounting parts The relative position accuracy with the preset lower mounting part; by loosening the locking bolts on the two adjusting devices, lower the horizontal adjustment plate, the vertical mounting plate, the preset upper mounting part and the preset lower mounting part to the specified height, and then lock the locking bolts on the two adjusting devices to ensure the installation height accuracy of the preset upper mounting part and the preset lower mounting part; adjust the vertical adjustment bolts on the two adjusting devices (for example, tighten or loosen the vertical adjustment bolts) to level the horizontal adjustment plate, so that the horizontal adjustment plate is in a horizontal state, so that the vertical mounting plate is in a vertical state, so that the preset upper mounting part and the preset lower mounting part are in a vertical distribution state to ensure the accuracy of the positioning orientation. Thereafter, the preset upper mounting part is welded to the steel column of the retaining pile of the foundation pit, and the preset lower mounting part is welded to the steel column of the retaining pile of the foundation pit, which ensures the on-site positioning of the preset upper mounting part and the preset lower mounting part, and ensures the accuracy of the positioning position and orientation.

[0028] The beneficial effects of the present invention are as follows: not only is the installation and construction operation convenient, the installation and construction efficiency can be improved; but also the accuracy of the installation position is improved, so as to facilitate the force bearing of the support system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of an assembled steel corbel support device for foundation pit enclosure according to a first specific embodiment of the present invention.

[0030] Figure 2 It is a top view of a preset upper mounting part in an implementation manner of an assembled steel corbel support device for foundation pit enclosure according to a first specific embodiment of the present invention.

[0031] Figure 3 It is a top view of a preset upper mounting part in another implementation manner of the assembled steel corbel support device for foundation pit enclosure in the first specific embodiment of the present invention.

[0032] Figure 4 It is a top view of a preset upper mounting part in the third implementation manner of the assembled steel corbel support device for foundation pit enclosure in the first specific embodiment of the present invention.

[0033] Figure 5 It is a structural schematic diagram of the auxiliary installation device of the specific embodiment 3 of the present invention.

[0034] Figure 6 yes Figure 5 A partial enlarged view of point A in the middle.

[0035] In the figure:

[0036] Prefabricated corbel 1, support rod 1.1, diagonal brace 1.2;

[0037] Preset upper mounting part 2, upper mounting plate 2.1, upper welding plate 2.2;

[0038] Preset lower mounting part 3, lower mounting plate 3.1;

[0039] Steel column 4;

[0040] Horizontal adjustment plate 5;

[0041] Vertical mounting plate 6;

[0042] Adjustment device 7, vertical guide sleeve 7.1, sliding column 7.2, lifting rope through hole 7.3, preload compression spring 7.4, upper baffle 7.5, lower baffle 7.6, vertical adjustment bolt 7.7, locking bolt 7.8;

[0043] Lifting rope 8;

[0044] Hook 9;

[0045] Upper mounting hole 10;

[0046] Lower mounting hole 11. DETAILED DESCRIPTION

[0047] Specific embodiment 1: Figure 1 As shown, an assembled steel corbel support device for foundation pit protection includes a prefabricated corbel 1, a preset upper mounting member 2 and a preset lower mounting member 3.

[0048] The prefabricated corbel includes a support rod 1.1 and an oblique support rod 1.2 located below the support rod. The upper end of the oblique support rod is connected to the support rod, and the upper end of the oblique support rod is connected to the support rod by welding or bolts. In this embodiment, the upper end of the oblique support rod is connected to the support rod by welding. The angle between the oblique support rod and the support rod is 30-60 degrees. In this embodiment, the angle between the oblique support rod and the support rod is 45 degrees. The support rod and the oblique support rod are both made of H-shaped steel.

[0049] The preset upper mounting part 2 is welded to the steel column 4 of the retaining pile of the foundation pit. The preset lower mounting part 3 is located below the preset upper mounting part, and the preset lower mounting part is welded to the steel column of the retaining pile of the foundation pit. One end of the support rod is connected to the preset upper mounting part by an upper bolt. The lower end of the diagonal support rod is connected to the preset lower mounting part by a lower bolt. The support rods are distributed horizontally.

[0050] During the specific installation and construction of the assembled steel corbel support device for foundation pit enclosure of this embodiment, the preset upper mounting piece is welded and connected to the steel column of the enclosure pile of the foundation pit, and the preset lower mounting piece is welded and connected to the steel column of the enclosure pile of the foundation pit. Since the preset upper mounting piece and the preset lower mounting piece are used to install the prefabricated corbel, their volume and mass are small, which is convenient for on-site positioning and welding, and the welding quality can be guaranteed when the lighter preset upper mounting piece and the preset lower mounting piece are welded to the steel column; then, the prefabricated corbel made in the factory is directly installed on the preset upper mounting piece and the preset lower mounting piece through the upper bolts and the lower bolts. In this way, not only the installation and construction operation of the assembled steel corbel support device for foundation pit enclosure is convenient, which can improve the installation and construction efficiency; it is also beneficial to improve the installation position accuracy of the assembled steel corbel support device for foundation pit enclosure, so as to facilitate the force of the support system.

[0051] Specifically, the retaining piles of the foundation pit are formed by cement-soil mixing piles and steel columns inserted in the cement-soil mixing piles. The steel columns are steel columns, such as H-shaped steel columns or I-shaped steel columns or square steel columns. In this embodiment, the steel columns are H-shaped steel columns.

[0052] The preset upper mounting member 2 includes an upper mounting plate 2.1, on which bolt connection holes are provided. Bolt connection holes are provided on the web of the H-shaped steel constituting the support rod, and the bolt connection holes on the support rod are close to one end of the support rod. The upper bolt passes through the bolt connection holes on the upper mounting plate and the support rod to connect one end of the support rod with the preset upper mounting member as a whole. The upper mounting plate is located between the two flange plates of the H-shaped steel constituting the support rod, and the upper mounting plate is close to the web of the H-shaped steel constituting the support rod. In this way, it is convenient to connect one end of the support rod with the preset upper mounting member through the upper bolt, and it is beneficial to improve the connection stability between one end of the support rod and the preset upper mounting member.

[0053] The preset lower mounting member 3 includes a lower mounting plate 3.1, on which bolt connection holes are provided. Bolt connection holes are provided on the web of the H-shaped steel constituting the diagonal brace, and the bolt connection holes on the diagonal brace are close to the lower end of the diagonal brace. The lower bolts pass through the bolt connection holes on the lower mounting plate and the diagonal brace to connect the lower end of the diagonal brace with the preset lower mounting member as a whole. The lower mounting plate is located between the two flange plates of the H-shaped steel constituting the diagonal brace, and the lower mounting plate is close to the web of the H-shaped steel constituting the diagonal brace. In this way, it is convenient to connect one end of the diagonal brace with the preset lower mounting member through the lower bolts, and it is beneficial to improve the connection stability between one end of the diagonal brace and the preset lower mounting member.

[0054] like Figure 2 As shown, in one implementation of this embodiment, the preset upper mounting member 2 is composed of a steel plate, which constitutes an upper mounting plate, which is welded to the steel column, and the upper mounting plate is vertically distributed, and the upper mounting plate is perpendicular to the flange plate of the H-shaped steel column constituting the steel column. The preset lower mounting member 2 is composed of a steel plate, which constitutes a lower mounting plate, and the lower mounting plate is welded to the steel column. The lower mounting plate is vertically distributed, and the lower mounting plate is perpendicular to the flange plate of the H-shaped steel column constituting the steel column.

[0055] like Figure 3 As shown, in another implementation of this embodiment, the cross-section of the preset upper mounting member 2 is L-shaped, which is composed of the upper mounting plate 2.1 and the upper welding plate 2.2, the upper mounting plate and the upper welding plate are an integral structure, and the upper welding plate is welded to the steel column of the retaining pile of the foundation pit. The upper mounting plate is vertically distributed, and the upper mounting plate is perpendicular to the flange plate of the H-shaped steel column constituting the steel column. The cross-section of the preset lower mounting member is L-shaped, which is composed of the lower mounting plate and the lower welding plate, and the lower mounting plate and the lower welding plate are an integral structure. The lower welding plate is welded to the steel column of the retaining pile of the foundation pit. The lower mounting plate is vertically distributed, and the lower mounting plate is perpendicular to the flange plate of the H-shaped steel column constituting the steel column.

[0056] like Figure 4As shown, in the third implementation of this embodiment, the cross-section of the preset upper mounting member 2 is T-shaped, which is composed of the upper mounting plate 2.1 and the upper welding plate 2.2, the upper mounting plate and the upper welding plate are an integral structure, and the upper welding plate is welded to the steel column of the retaining pile of the foundation pit. The upper mounting plate is vertically distributed, and the upper mounting plate is perpendicular to the flange plate of the H-shaped steel column constituting the steel column. The cross-section of the preset lower mounting member is T-shaped, which is composed of the lower mounting plate and the lower welding plate, the lower mounting plate and the lower welding plate are an integral structure, and the lower welding plate is welded to the steel column of the retaining pile of the foundation pit. The lower mounting plate is vertically distributed, and the lower mounting plate is perpendicular to the flange plate of the H-shaped steel column constituting the steel column.

[0057] Specific embodiment 2, a construction method of an assembled steel corbel support device for foundation pit enclosure, the specific structure of the assembled steel corbel support device for foundation pit enclosure in this embodiment refers to specific embodiment 1, the construction method of the assembled steel corbel support device for foundation pit enclosure includes the following steps,

[0058] First, the corbel is prefabricated, and the upper end of the diagonal brace is connected to the support rod by welding;

[0059] Second, the preset upper mounting parts are installed with the preset lower mounting parts, the preset upper mounting parts are welded to the steel columns of the retaining piles of the foundation pit, and the preset lower mounting parts are welded to the steel columns of the retaining piles of the foundation pit;

[0060] Third, one end of the support rod is connected to the preset upper mounting piece through an upper bolt; and the lower end of the diagonal support rod is connected to the preset lower mounting piece through a lower bolt.

[0061] Specific embodiment 3, the specific construction method of the construction method of the assembled steel bracket support device for foundation pit enclosure of this embodiment refers to the specific embodiment 2, and the difference is that:

[0062] In the second step of the second specific embodiment, when the preset upper mounting member and the preset lower mounting member are installed, an auxiliary mounting device is used for installation.

[0063] like Figure 5 , Figure 6 As shown, the auxiliary installation device includes a transverse adjustment plate 5, a vertical installation plate 6 connected to the transverse adjustment plate at the upper end, two adjustment devices 7 arranged on the transverse adjustment plate, two lifting ropes 8 corresponding to the adjustment devices one by one, and an upper hole group and a lower hole group arranged on the vertical installation plate. The upper end of the vertical installation plate is located between the two adjustment devices. In this embodiment, the two adjustment devices are symmetrically distributed on both sides of the vertical installation plate.

[0064] The adjustment device includes a vertical guide sleeve 7.1 arranged on the transverse adjustment plate, a sliding column 7.2 slidably arranged in the vertical guide sleeve, a lifting rope through hole 7.3 penetrating the upper and lower end surfaces of the sliding column, an upper baffle plate 7.5 and a lower baffle plate 7.6 arranged on the sliding column, a preload compression spring 7.4 sleeved on the sliding column, and a vertical adjustment bolt 7.7 arranged on the lower baffle plate. The upper baffle plate is located above the transverse adjustment plate, and the upper baffle plate is located above the vertical guide sleeve. The preload compression spring is located between the upper baffle plate and the transverse adjustment plate, the lower end of the preload compression spring abuts against the transverse adjustment plate, and the upper end of the preload compression spring abuts against the upper baffle plate. The lower baffle plate is located below the vertical guide sleeve, and the upper end of the vertical adjustment bolt abuts against the lower surface of the transverse adjustment plate.

[0065] The vertical mounting plate is perpendicular to the horizontal adjustment plate. The upper hole group includes a plurality of upper mounting holes 10 for connecting a preset upper mounting member. The lower hole group is located below the upper hole group, and the lower hole group includes a plurality of lower mounting holes 11 for connecting a preset lower mounting member.

[0066] The upper end of the hoisting rope is provided with a hook 9, and the hoisting rope passes through the hoisting rope through hole of the corresponding auxiliary installation device. The sliding column is also provided with a locking bolt 7.8 for locking the hoisting rope. In this embodiment, the locking bolt is located below the transverse adjustment plate.

[0067] The specific steps of installing the preset upper mounting member and the preset lower mounting member in the second step of the specific embodiment 2 are as follows:

[0068] (1) Install the preset upper mounting member 2 on the upper mounting hole of the upper hole group by connecting bolts, and install the preset lower mounting member 3 on the lower mounting hole of the lower hole group by connecting bolts, so as to pre-install the preset upper mounting member and the preset lower mounting member on the vertical mounting plate; at this time, the upper mounting plate of the upper mounting member is closely attached to the vertical mounting plate and is parallel to the vertical mounting plate; the lower mounting plate of the lower mounting member is closely attached to the vertical mounting plate and is parallel to the vertical mounting plate.

[0069] (2) Hang the hooks at the upper ends of the two lifting ropes on the upper ends of the steel columns, so as to hang the auxiliary installation device below the upper ends of the steel columns. At this time, the preset upper installation parts and the preset lower installation parts are pre-abutted against the outer surface of the steel columns, and the vertical installation plate is perpendicular to the flange plate of the H-shaped steel column constituting the steel column;

[0070] Next, loosen the locking bolts on the two adjustment devices, lower the horizontal adjustment plate, the vertical mounting plate, the preset upper mounting piece and the preset lower mounting piece to the specified height, and then lock the locking bolts on the two adjustment devices;

[0071] Next, the horizontal adjustment plate is leveled by adjusting the vertical adjustment bolts on the two adjustment devices, so that the horizontal adjustment plate is in a horizontal state, thereby making the vertical mounting plate in a vertical state, and making the upper mounting plate and the lower mounting plate in a vertical state;

[0072] (3) The preset upper mounting parts are welded to the steel columns of the retaining piles of the foundation pit, and the preset lower mounting parts are welded to the steel columns of the retaining piles of the foundation pit.

[0073] Although the preset upper mounting parts and the preset lower mounting parts are small in size and mass, which are convenient for on-site positioning and welding; however, in actual operation, there are still problems such as inconvenient on-site positioning of the preset upper mounting parts and the preset lower mounting parts and inaccurate positioning. In order to solve this problem, the inventor has designed an auxiliary mounting device to position the preset upper mounting parts and the preset lower mounting parts, so as to facilitate on-site positioning of the preset upper mounting parts and the preset lower mounting parts and ensure the accuracy of the positioning position and orientation. Specifically, the preset upper mounting parts are installed on the upper mounting holes of the upper hole group by connecting bolts, and the preset lower mounting parts are installed on the lower mounting holes of the lower hole group by connecting bolts, thereby ensuring the preset upper mounting parts. The relative position accuracy with the preset lower mounting part; by loosening the locking bolts on the two adjusting devices, lower the horizontal adjustment plate, the vertical mounting plate, the preset upper mounting part and the preset lower mounting part to the specified height, and then lock the locking bolts on the two adjusting devices to ensure the installation height accuracy of the preset upper mounting part and the preset lower mounting part; adjust the vertical adjustment bolts on the two adjusting devices (for example, tighten or loosen the vertical adjustment bolts) to level the horizontal adjustment plate, so that the horizontal adjustment plate is in a horizontal state, so that the vertical mounting plate is in a vertical state, so that the preset upper mounting part and the preset lower mounting part are in a vertical distribution state to ensure the accuracy of the positioning orientation. Thereafter, the preset upper mounting part is welded to the steel column of the retaining pile of the foundation pit, and the preset lower mounting part is welded to the steel column of the retaining pile of the foundation pit, which ensures the on-site positioning of the preset upper mounting part and the preset lower mounting part, and ensures the accuracy of the positioning position and orientation.

[0074] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A construction method for an assembled steel bracket support device for foundation pit enclosure, characterized in that: The following steps are included: First, the corbel is prefabricated, and the upper end of the diagonal brace is connected to the support rod by welding; Second, the preset upper mounting part and the preset lower mounting part are installed by using an auxiliary mounting device, the preset upper mounting part is welded to the steel column of the retaining pile of the foundation pit, and the preset lower mounting part is welded to the steel column of the retaining pile of the foundation pit; The auxiliary installation device includes a transverse adjustment plate, a vertical installation plate connected to the transverse adjustment plate at the upper end, two adjustment devices arranged on the transverse adjustment plate, two lifting ropes corresponding to the adjustment devices one by one, and an upper hole group and a lower hole group arranged on the vertical installation plate, and the adjustment device includes a vertical guide sleeve arranged on the transverse adjustment plate, a sliding column slidably arranged in the vertical guide sleeve, a lifting rope through hole penetrating the upper and lower end surfaces of the sliding column, and an upper baffle plate and a lower baffle plate arranged on the sliding column; The adjusting device also includes a pre-tightening compression spring sleeved on the sliding column and a vertical adjusting bolt arranged on the lower baffle plate, the upper end of the vertical adjusting bolt abuts against the lower surface of the horizontal adjusting plate, and the sliding column is also provided with a locking bolt for locking the lifting rope; Third, one end of the support rod is connected to the preset upper mounting piece through an upper bolt; and the lower end of the diagonal support rod is connected to the preset lower mounting piece through a lower bolt.

2. The construction method of the assembled steel bracket support device for foundation pit enclosure according to claim 1 is characterized in that: The upper baffle is located above the transverse adjustment plate, the preload compression spring is located between the upper baffle and the transverse adjustment plate, the lower baffle is located below the vertical guide sleeve, a hook is provided at the upper end of the lifting rope, the lifting rope passes through the corresponding lifting rope through hole of the auxiliary installation device, the vertical installation plate is perpendicular to the transverse adjustment plate, the upper hole group includes a plurality of upper installation holes for connecting the preset upper installation parts, the lower hole group is located below the upper hole group, and the lower hole group includes a plurality of lower installation holes for connecting the preset lower installation parts; The specific steps of installing the preset upper mounting member and the preset lower mounting member in the second step are as follows: A, install the preset upper mounting piece on the upper mounting hole of the upper hole group through connecting bolts, and install the preset lower mounting piece on the lower mounting hole of the lower hole group through connecting bolts, so as to pre-install the preset upper mounting piece and the preset lower mounting piece on the vertical mounting plate; B. Hang the hooks at the upper ends of the two lifting ropes on the upper ends of the steel columns, so as to hang the auxiliary installation device below the upper ends of the steel columns. At this time, the preset upper installation parts and the preset lower installation parts are pre-abutted against the outer surface of the steel columns; then, loosen the locking bolts on the two adjustment devices, lower the horizontal adjustment plate, the vertical installation plate, the preset upper installation parts and the preset lower installation parts to the specified height, and then lock the locking bolts on the two adjustment devices; then, adjust the vertical adjustment bolts on the two adjustment devices to level the horizontal adjustment plate, so that the horizontal adjustment plate is in a horizontal state, and the vertical installation plate is in a vertical state; C. Weld the preset upper mounting parts to the steel columns of the retaining piles of the foundation pit, and weld the preset lower mounting parts to the steel columns of the retaining piles of the foundation pit.

3. The construction method of the assembled steel bracket support device for foundation pit enclosure according to claim 1 is characterized in that: The assembled steel bracket support device for foundation pit protection includes: Prefabricated corbels, the prefabricated corbels include a support rod and an oblique support rod located below the support rod, and the upper end of the oblique support rod is connected to the support rod; A preset upper mounting piece is welded to a steel column of a retaining pile of a foundation pit, and one end of the support rod is connected to the preset upper mounting piece by an upper bolt; A preset lower mounting piece is located below the preset upper mounting piece, the preset lower mounting piece is welded to the steel column of the retaining pile of the foundation pit, and the lower end of the diagonal brace is connected to the preset lower mounting piece through a lower bolt.

4. The construction method of the assembled steel corbel support device for foundation pit enclosure according to claim 3 is characterized in that: The preset upper mounting part includes an upper mounting plate, which is provided with bolt connection holes. The support rod is composed of H-shaped steel, and the web of the H-shaped steel constituting the support rod is provided with bolt connection holes, and the bolt connection holes on the support rod are close to one end of the support rod. The upper bolt passes through the upper mounting plate and the bolt connection holes on the support rod to connect one end of the support rod with the preset upper mounting part as a whole.

5. The construction method of the assembled steel bracket support device for foundation pit enclosure according to claim 4 is characterized in that: The cross section of the preset upper mounting part is L-shaped, and it is composed of the upper mounting plate and the upper welding plate. The upper mounting plate and the upper welding plate are an integrally formed structure, and the upper welding plate is welded to the steel columns of the retaining piles of the foundation pit.

6. The construction method of the assembled steel bracket support device for foundation pit enclosure according to claim 4 is characterized in that: The cross section of the preset upper mounting part is T-shaped, and it is composed of the upper mounting plate and the upper welding plate. The upper mounting plate and the upper welding plate are an integrally formed structure, and the upper welding plate is welded to the steel columns of the retaining piles of the foundation pit.

7. The construction method of the assembled steel bracket support device for foundation pit enclosure according to claim 3, 4, 5 or 6, characterized in that: The preset lower mounting member includes a lower mounting plate, which is provided with bolt connection holes. The diagonal brace is composed of H-shaped steel. The web of the H-shaped steel constituting the diagonal brace is provided with bolt connection holes, and the bolt connection holes on the diagonal brace are close to the lower end of the diagonal brace. The lower bolts pass through the lower mounting plate and the bolt connection holes on the diagonal brace to connect the lower end of the diagonal brace with the preset lower mounting member as a whole.

8. The construction method of the assembled steel bracket support device for foundation pit enclosure according to claim 7 is characterized in that: The cross section of the preset lower mounting part is L-shaped, and it is composed of the lower mounting plate and the lower welding plate. The lower mounting plate and the lower welding plate are an integrally formed structure, and the lower welding plate is welded to the steel columns of the retaining piles of the foundation pit.

9. The construction method of the assembled steel bracket support device for foundation pit enclosure according to claim 7 is characterized in that: The cross section of the preset lower mounting part is T-shaped, and it is composed of the lower mounting plate and the lower welding plate. The lower mounting plate and the lower welding plate are an integrally formed structure, and the lower welding plate is welded to the steel columns of the retaining piles of the foundation pit.

10. The construction method of the assembled steel bracket support device for foundation pit enclosure according to claim 3, 4, 5 or 6, characterized in that: The upper end of the diagonal brace is connected to the support rod by welding or bolts.

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