Deep foundation pit lifting safety channel

Abstract

The utility model provides a deep foundation pit lifting safety channel which comprises two stand columns and two cantilever beams which are installed on the top and the side edges of a top beam of a foundation pit, two winches are further arranged on the top of the top beam, and lifting steel wire ropes of the winches sequentially penetrate through rolling pin shafts installed on the stand columns and the cantilever beams and then are connected with lifting lugs on a hanging platform base. A disc buckle type safety crawling ladder is erected on the suspension platform base, and a suspension steel wire rope is also installed between the cantilever beam and the suspension platform base. The safety channel can be flexibly adjusted to move up and down, and the problems that the upper safety channel and the lower safety channel of a deep foundation pit are limited by earth cutting and need to be erected and disassembled for multiple times, and manpower and material resource cost is high are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction, in particular to a deep foundation pit lifting safety passage. Background Art

[0002] With the development of the construction industry and the resulting shortage of land for urban construction, deep foundation pit projects exceeding 5 meters or even deeper are becoming increasingly common. Furthermore, due to site constraints, deep foundation pit projects are often excavated vertically. In such deep foundation pit projects, safe passages are required to accommodate workers in and out of the pit. However, as excavation progresses layer by layer, these passages must be repeatedly erected and dismantled, consuming significant manpower and resources, and the process also impacts on-site construction progress. To address these issues, this utility model designs a novel deep foundation pit elevating safe passage. Utility Model Content

[0003] In response to the deficiencies in the prior art, the utility model provides a deep foundation pit lifting safety passage, which solves the problem that the upper and lower safety passages in deep foundation pits are restricted by excavation, require multiple erection and dismantling, and have high manpower and material costs.

[0004] The utility model achieves the above technical objectives through the following technical means.

[0005] A deep foundation pit lifting safety passage comprises a cantilever beam, a column, a suspension platform base, and a disc-type safety ladder; the cantilever beam and the column are respectively installed at the side and top positions of the foundation pit crown beam, and rolling pins are installed on the cantilever beam and the column. A winch is also arranged on the top of the crown beam. The lifting wire rope connected to the winch passes through the rolling pins on the column and the cantilever beam in turn and is connected to the suspension platform base below. The disc-type safety ladder is installed on the suspension platform base; a suspension wire rope is also installed between the cantilever beam and the suspension platform base.

[0006] Furthermore, during the construction of the crown beam, the embedded parts of the cantilever beam and the column are embedded in the crown beam concrete, and the cantilever beam and the column are installed and fixed to the crown beam through the embedded parts.

[0007] Furthermore, a triangular reinforcement plate is welded between the lower surface of the cantilever beam and the embedded part.

[0008] Furthermore, the suspension platform base includes three suspension platform base transverse steel beams arranged in a direction parallel to the crown beam and two suspension platform base longitudinal steel beams arranged in a direction perpendicular to the crown beam. The suspension platform base transverse steel beams are located above the suspension platform base longitudinal steel beams and are welded into one piece with each other; the spacing of the suspension platform base transverse steel beams matches the vertical pole module of the disc-type safety ladder; and the suspension platform base longitudinal steel beams are welded with lifting ears for installing lifting wire ropes and suspension wire ropes.

[0009] Furthermore, a lifting lug for installing a hanging wire rope is welded on the lower surface of the cantilever beam.

[0010] Furthermore, when the deep foundation pit lifting safety passage is in the lifting state, no one stands on the deep foundation pit lifting safety passage, and the winch cooperates with the lifting wire rope to lift or lower the suspension platform base. After the suspension platform base reaches the predetermined elevation, a disc-type safety ladder is set up to the crown beam height; when the deep foundation pit lifting safety passage is in use, the suspension wire rope is tensioned, the lifting wire rope is relaxed, and the disc-type frame is tied to the surrounding structure of the frame.

[0011] The utility model has the following beneficial effects:

[0012] The utility model can flexibly adjust the safety passage to move up and down, and solves the problem that the upper and lower safety passages in deep foundation pits are restricted by excavation, need to be erected and dismantled many times, and have high manpower and material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an elevation view of the deep foundation pit lifting safety passage described in the utility model;

[0014] Figure 2 This is a plan view of the deep foundation pit lifting safety passage described in the utility model;

[0015] In the figure: 1-cantilever beam; 2-lifting wire rope; 3-longitudinal steel beam of suspension platform base; 4-transverse steel beam of suspension platform base; 5-suspension wire rope; 6-winch; 7-column; 8-embedded parts; 9-triangular reinforcement plate; 10-crown beam. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0017] The deep foundation pit lifting safety passage of the utility model comprises a cantilever beam 1, a column 7, a suspension platform base, a lifting system, and a disc-type safety ladder.

[0018] like Figure 1 、 2 As shown, during the construction of the foundation pit crown beam 10, the embedded parts 8 of the cantilever beam 1 and the column 7 are all embedded in the concrete of the crown beam 10, wherein the embedded parts 8 of the cantilever beam 1 are located on the side of the crown beam 10, and the embedded parts 8 of the column 7 are located on the top of the crown beam 10. The two cantilever beams 1 and the two columns 7 are respectively installed at the side and top positions of the crown beam 10 through the embedded parts 8, and are all perpendicular to the crown beam 10.

[0019] like Figure 1 、 2As shown, in this embodiment, preferably, both the cantilever beam 1 and the column 7 are made of 20# I-beam. Two rolling pins are installed on each cantilever beam 1. A long hole is defined on the cantilever beam 1 flange above the rolling pin, and a round hole is defined below for the lifting wire rope 2 to pass through. Reinforcement plates are welded on both sides of the rolling pins, and the thickness of the stiffening plates is the same as the I-beam flange.

[0020] like Figure 1 As shown, in this embodiment, preferably, a triangular reinforcement plate 9 is further welded between the lower surface of the cantilever beam 1 and the embedded part 8 .

[0021] like Figure 1 、 2 As shown, the suspended platform base is composed of five I-beams: three transverse beams 4 arranged parallel to the crown beam 10 and two longitudinal beams 3 arranged perpendicular to the crown beam 10. The transverse beams 4 are positioned above the longitudinal beams 3 and welded together to form the suspended platform base. The spacing of the transverse beams 4 matches the vertical module of the disc-type safety ladder.

[0022] like Figure 1 、 2 As shown, the lifting system includes a winch 6, a lifting wire rope 2, and a suspension wire rope 5; one end of the lifting wire rope 2 is connected to the winch 6, and the other end passes through the rolling pin on the top of the column 7 and the rolling pin on the cantilever beam 1 in sequence, and then is connected to the lifting lug welded on the longitudinal steel beam 3 of the suspension platform base; one end of the suspension wire rope 5 is connected to the lifting lug welded on the lower surface of the cantilever beam 1, and the other end is connected to the lifting lug welded on the longitudinal steel beam 3 of the suspension platform base.

[0023] The deep foundation pit lifting safety passage described in the utility model is divided into a lifting state and a use state; in the lifting state, no one is allowed to stand on the safety passage, and the winch 6 cooperates with the lifting wire rope 2 to lift or lower the suspension platform base. After the suspension platform base reaches the predetermined elevation, a disc-type safety ladder is set up to the height of the crown beam 10; in the use state, the suspension wire rope 5 is tensioned, the lifting wire rope 2 is relaxed, and the disc-type frame is tied to the surrounding structure of the frame.

[0024] The specific installation and use method of the deep foundation pit lifting safety passage described in this utility model in actual construction is as follows:

[0025] S1: According to the frame type and maximum erection height, select the corresponding specifications of the cantilever beam 1, the I-beam of the suspension platform base, the steel wire rope, and the embedded parts 8;

[0026] S1: When casting the crown beam 10, embed the columns 7 and the embedded parts 8 of the cantilever beam 1;

[0027] S2: After the concrete of the crown beam 10 reaches the design strength, the cantilever beam 1 and the column 7 are installed. A long strip hole is opened on the upper flange of the rolling pin of the cantilever beam 1, and a round hole is opened on the lower flange for the subsequent lifting wire rope 2 to pass through. Reinforcement stiffening plates are welded on both sides of the rolling pin. The thickness of the stiffening plates is the same as that of the I-beam flange.

[0028] S3: Welding the suspension platform base, and welding the U-shaped lifting lugs above the longitudinal steel beam 3 of the suspension platform base;

[0029] S4: Fix two low-speed winches 6 of the same model on the crown beam 10, pass the lifting wire ropes 2 connected to the winches 6 through the columns 7 and the rolling pins on the cantilever beam 1, and finally connect them to the lifting lugs on the longitudinal steel beam 3 of the suspension platform base;

[0030] S5: Temporarily place the suspended platform base on the foundation. The foundation must be flat and meet the load requirements of the frame. Set up a buckle-type safety ladder on the suspended platform base.

[0031] S6: Tension the lifting wire rope 2 to lift the base of the suspension platform off the ground;

[0032] S7: Excavation of the foundation pit is carried out. After the excavation reaches the working surface height, the winches 6 are started (two winches 6 are required to be synchronized), the suspension platform base is lowered to the working surface height, the suspension wire rope 5 connecting the cantilever beam 1 and the longitudinal steel beam 3 of the suspension platform base is tensioned, and the frame wall connection parts are installed and connected to the surrounding retaining piles or support beams. At this time, the lifting safety passage can be used for workers to go up and down the foundation pit;

[0033] S8: After the current working surface is completed, the foundation pit continues to be excavated downwards to the height of the lower working surface. The safety passage frame is further erected to a certain height, the frame wall ties are removed, the lifting wire rope 2 is tensioned, the suspension wire rope 5 is untied, and the winch 6 is started (both winches 6 must be synchronized). The suspension platform base is lowered to the height of the next working surface, the suspension wire rope 5 is tensioned, and the frame wall ties are installed and tied to the surrounding retaining piles or support beams. At this point, the lifting safety passage is ready for workers to enter and exit the foundation pit.

[0034] S9: After descending to the bottom plate of the deep foundation pit, carry out bottom plate construction work. As the structural construction progresses, follow the steps of descending the lifting safety passage, gradually raise it to the corresponding working surface elevation and remove the redundant frame on the top.

[0035] The embodiments described are preferred implementations of the present invention, but the present invention is not limited to the above-mentioned implementations. Any obvious improvements, replacements or modifications that can be made by those skilled in the art without departing from the essential content of the present invention are within the scope of protection of the present invention.

Claims

1. A deep foundation pit lifting safety passage, characterized in that: The utility model comprises a cantilever beam (1), a column (7), a suspension platform base, and a buckle-type safety ladder; the cantilever beam (1) and the column (7) are respectively installed at the side and top positions of the foundation pit crown beam (10); the cantilever beam (1) and the column (7) are both installed with rolling pins; a winch (6) is also arranged on the top of the crown beam (10); the lifting wire rope (2) connected to the winch (6) passes through the rolling pins on the column (7) and the cantilever beam (1) in sequence and is connected to the suspension platform base below; the buckle-type safety ladder is installed on the suspension platform base; a suspension wire rope (5) is also installed between the cantilever beam (1) and the suspension platform base.

2. The deep foundation pit lifting safety passage according to claim 1 is characterized in that: During the construction of the crown beam (10), the embedded parts (8) of the cantilever beam (1) and the column (7) are embedded in the concrete of the crown beam (10), and the cantilever beam (1) and the column (7) are fixed to the crown beam (10) through the embedded parts (8).

3. The deep foundation pit lifting safety passage according to claim 2 is characterized in that: A triangular reinforcement plate (9) is also welded between the lower surface of the cantilever beam (1) and the embedded part (8).

4. The deep foundation pit lifting safety passage according to claim 1 is characterized in that: The suspension platform base comprises three suspension platform base transverse steel beams (4) arranged in a direction parallel to the crown beam (10) and two suspension platform base longitudinal steel beams (3) arranged in a direction perpendicular to the crown beam (10). The suspension platform base transverse steel beams (4) are located above the suspension platform base longitudinal steel beams (3) and are welded together to form a whole. The arrangement spacing of the suspension platform base transverse steel beams (4) matches the vertical pole module of the disc-type safety ladder. Lifting lugs for installing lifting wire ropes (2) and suspension wire ropes (5) are welded on the suspension platform base longitudinal steel beams (3).

5. The deep foundation pit lifting safety passage according to claim 1 is characterized in that: A lifting lug for installing a suspension wire rope (5) is welded to the lower surface of the cantilever beam (1).

6. The deep foundation pit lifting safety passage according to claim 1 is characterized in that: When the deep foundation pit lifting safety passage is in a lifting state, no one stands on the deep foundation pit lifting safety passage, and the hoist (6) cooperates with the lifting wire rope (2) to lift or lower the suspension platform base. After the suspension platform base reaches a predetermined elevation, a buckle-type safety ladder is set up to the height of the crown beam (10); When the deep foundation pit lifting safety passage is in use, the hanging steel wire rope (5) is tightened, the lifting steel wire rope (2) is loosened, and the buckle frame and the surrounding structure of the frame are tied together.

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