1. The steel pipe underpinning device capable of replacing the support in the deep foundation pit is characterized by comprising a support rod (7), wherein two ends of the support rod (7) are connected with threaded sleeves (5) through threads, the outer sides of the threaded sleeves (5) are provided with support pipe bodies (3), a plurality of limiting structures (4) are rotatably mounted on the outer sides of the support pipe bodies (3), a connecting block (8) penetrating through the support pipe bodies (3) is arranged on the outer circumferential surface of each threaded sleeve (5), and the other ends of the connecting blocks (8) are fixed with limiting blocks (9);

one end that support body (3) kept away from each other all is fixed with articulated seat (2), the opposite side of articulated seat (2) is all rotated and is installed mounting panel (1), and the four corners department of mounting panel (1) all is provided with preformed hole (12).

2. The steel pipe underpinning device for replacing the support in the deep foundation pit as claimed in claim 1, wherein a plurality of sets of vertically arranged slide rail assemblies (10) are fixed on the outer circumferential surface of the support pipe body (3) at equal intervals, and each set of slide rail assemblies (10) comprises a plurality of arc-shaped limiting strips fixed on the outer circumferential side of the support pipe body (3) in order.

3. The steel pipe underpinning device for replacing the support in the deep foundation pit as claimed in claim 2, wherein the limiting structure (4) comprises a plurality of sliding bar rails (42) slidably mounted between the sliding rail assemblies (10), a limiting ring (41) is jointly fixed on the outer peripheral side of the plurality of sliding bar rails (42), and a limiting groove (43) is equidistantly formed in the limiting ring (41).

4. The steel pipe underpinning device for replacing the support in the deep foundation pit as claimed in claim 3, wherein the shape and size of the limiting groove (43) are matched with the shape and size of the limiting block (9).

5. The steel pipe underpinning device for replacing the support in the deep foundation pit as claimed in claim 4, wherein the thickness of the sliding strip rail (42) is equal to the distance between the adjacent sliding rail assemblies (10), the thickness of the limiting block (9) is a positive integral multiple of the limiting ring (41), and the surfaces of the adjacent upper limiting ring and the lower limiting ring (41) are mutually attached.

6. The steel pipe underpinning device for replacing the support in the deep foundation pit as claimed in claim 1, wherein the middle part of the support rod (7) is provided with an adjusting knob (6) for rotation, the upper half part and the lower half part of the support rod (7) are provided with threads, and the thread turning directions are opposite.

7. The steel pipe underpinning device for replacing the support in the deep foundation pit as claimed in claim 1, wherein the outer circumference of the support pipe body (3) is provided with a plurality of through grooves for the connecting blocks (8) to slide.

Background

The deep foundation pit refers to a project which has an excavation depth of more than 5 meters (including 5 meters), or has a depth of less than 5 meters, but has particularly complicated geological conditions, surrounding environments and underground pipelines.

The support replacement is that after the structural construction is completed under the working condition of the prior steel support, the prior steel support form influences the subsequent structural construction, so the prior steel support needs to be replaced and supported to facilitate the subsequent structural construction, and the support replacement is generally performed on the structure completed in the previous process. In the construction of deep foundation pits of subway stations and air shafts, the construction of wallboards and columns is influenced after the bottom plate is poured by the early steel vertical supports, so the steel inclined supports are replaced on the bottom plate.

At present, a supporting structure is generally needed to be replaced when the steel pipe is underpinned, the operation of the current supporting structure is very inconvenient, the current supporting structure cannot be adjusted according to actual working conditions, and the use has great limitation.

Disclosure of Invention

The invention aims to solve the problems in the background art, and provides a steel pipe underpinning device for replacing a support in a deep foundation pit, which can adjust the extension length of the device and generate a supporting force expanding towards two sides, thereby realizing the creation of underpinning environment, reducing the limitation of use, and being simple to operate and convenient to use.

In order to achieve the purpose, the invention adopts the following technical scheme:

a steel pipe underpinning device for replacing a support in a deep foundation pit comprises a supporting rod, wherein two ends of the supporting rod are connected with threaded sleeves through threads, supporting pipe bodies are arranged on the outer sides of the threaded sleeves, a plurality of limiting structures are rotatably mounted on the outer sides of the supporting pipe bodies, connecting blocks penetrating through the supporting pipe bodies are arranged on the outer circumferential surfaces of the threaded sleeves, and limiting blocks are fixed to the other ends of the connecting blocks;

the one end that the support body kept away from each other all is fixed with articulated seat, the opposite side of articulated seat all rotates installs the mounting panel, and the four corners department of mounting panel all is provided with the preformed hole.

Preferably, a plurality of groups of vertically arranged sliding rail assemblies are fixed on the outer circumferential surface of the supporting pipe body at equal intervals, and each group of sliding rail assemblies comprises a plurality of orderly arc-shaped limiting strips fixed on the outer circumferential side of the supporting pipe body.

Preferably, the limiting structure comprises a plurality of sliding bar rails which are slidably mounted between the sliding rail assemblies, a limiting ring is jointly fixed on the outer peripheral side of the plurality of sliding bar rails, and limiting grooves are equidistantly formed in the limiting ring.

Preferably, the shape and size of the limiting groove are matched with those of the limiting block.

Preferably, the thickness of the sliding strip rail is equal to the distance between adjacent sliding rail assemblies, the thickness of the limiting block is positive integral multiple of the limiting ring, and the surfaces of the upper limiting ring and the lower limiting ring which are adjacent are mutually attached.

Preferably, the middle part of the supporting rod is provided with an adjusting knob for rotation, the upper half part and the lower half part of the supporting rod are both provided with threads, and the thread turning directions are opposite.

Preferably, the circumferential surface outside the supporting pipe body is provided with a plurality of through grooves for the connecting blocks to slide.

The invention has the beneficial effects that:

1, the invention can realize the states of inclined strut and horizontal support by the arrangement of the hinge seat and the mounting plate in a hinge way;

2, the sliding strip rail can move along the arc-shaped limiting strip by rotating the limiting ring, so that the upper limiting groove and the lower limiting groove are staggered with each other, and the limiting block is supported;

3, the invention rotates the adjusting knob to rotate the supporting rod, and the extension length of the device is adjusted under the matching of the threaded sleeve, and a supporting force expanding to two sides is generated.

Drawings

Fig. 1 is a schematic structural view of a steel pipe underpinning device for replacing a support in a deep foundation pit according to the present invention.

Fig. 2 is a schematic structural diagram of a limiting structure in the steel pipe underpinning device for replacing the support in the deep foundation pit.

Fig. 3 is a sectional view taken in the direction B-B in fig. 1.

Fig. 4 is an enlarged schematic view of a portion a in fig. 1.

Reference numerals: 1 mounting panel, 2 articulated seats, 3 support body, 4 limit structure, 5 threaded sleeve, 6 adjust knob, 7 bracing pieces, 8 connecting blocks, 9 stopper, 10 sliding rail set spares, 12 preformed holes, 41 spacing rings, 42 slip strip rail, 43 spacing grooves.

Detailed Description

As shown in fig. 1 and 3, the steel pipe underpinning device for replacing the support in the deep foundation pit comprises a support rod 7, wherein both ends of the support rod 7 are connected with threaded sleeves 5 through threads, the outer sides of the threaded sleeves 5 are provided with support pipe bodies 3, a plurality of limiting structures 4 are rotatably mounted on the outer sides of the support pipe bodies 3, the outer circumferential surface of each threaded sleeve 5 is provided with a connecting block 8 penetrating through the support pipe body 3, and the other end of each connecting block 8 is fixed with a limiting block 9;

one end that the support tube body 3 kept away from each other all is fixed with articulated seat 2, and the opposite side of articulated seat 2 all rotates and installs mounting panel 1, and the four corners department of mounting panel 1 all is provided with preformed hole 12.

The outer periphery equidistance of support body 3 is fixed with the slide rail set 10 of the vertical arrangement of multiunit, and every slide rail set 10 includes a plurality of orderly arc spacing strips of fixing at the support body 3 periphery side.

Referring to fig. 2, the limiting structure 4 includes a plurality of sliding rails 42 slidably mounted between the sliding rail assemblies 10, a limiting ring 41 is fixed to an outer peripheral side of the plurality of sliding rails 42, and limiting grooves 43 are equidistantly formed in the limiting ring 41. The shape and size of the limiting groove 43 are matched with the shape and size of the limiting block 9.

The thickness of the sliding rail 42 shown in fig. 4 is equal to the distance between the adjacent sliding rail assemblies 10, the thickness of the limiting block 9 is positive integer times of the limiting ring 41, and the surfaces of the adjacent upper and lower limiting rings 41 are mutually attached. The middle part of the supporting rod 7 is provided with an adjusting knob 6 used for rotation, the upper half part and the lower half part of the supporting rod 7 are both provided with threads, and the thread screwing directions are opposite. A plurality of through grooves for the connecting blocks 8 to slide are formed in the outer circumferential surface of the supporting pipe body 3.

The existing steel pipe supporting structure is generally required to be replaced when in underpinning, the operation of the existing supporting structure is very inconvenient and cannot be adjusted according to actual working conditions, and the use has great limitation, in the embodiment, the device is placed at the position to be replaced and supported, the connecting block 8 and the limiting block 9 slide along the sliding chute and the limiting ring 41, so that the mounting plate 1 is respectively contacted with the position to be supported, the mounting plate 1 is fixed at the position to be supported through the preformed hole 12 and the bolt, and meanwhile, the hinge seat 2 is hinged with the mounting plate 1, so that the inclined support and horizontal support states can be realized;

treat two fixed backs of support position, through rotatory spacing ring 41 for sliding strip rail 42 can remove along the spacing strip of arc, make two upper and lower spacing grooves 43 misplace each other, thereby support stopper 9, and then restrict stopper 9's removal, then rotate adjust knob 6, make bracing piece 7 rotate, and make the extension length of device adjust under the cooperation of threaded sleeve 5, and produce the holding power to both sides extension, thereby create the environment for the underpinning of steel pipe.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.