Avoidance structure between foundation pit enclosing purlin and tower crane foundation

Abstract

The utility model relates to an avoiding structure between a foundation pit enclosing purlin and a tower crane foundation, the foundation pit enclosing purlin comprises a plurality of concrete columns, the tower crane foundation is arranged on the inner side of the foundation pit enclosing purlin, and a plurality of supporting beams are horizontally arranged on the top of the foundation pit enclosing purlin; the avoiding structure comprises H-shaped steel and a middle cross beam, and the H-shaped steel is arranged in a concrete column on the outer side of the tower crane foundation; a middle cross beam is arranged between every two adjacent supporting beams, and the intersection point of every two adjacent supporting beams is omitted, so that the two adjacent supporting beams do not intersect. The safety of the foundation pit support structure is guaranteed, and meanwhile safe construction of the tower crane is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit engineering, in particular to an avoidance structure between a foundation pit perimeter purlin and a tower crane foundation. Background Art

[0002] In today's world of high-rise buildings, deep foundation pit projects are now commonplace. There are many structures that play an indispensable role in deep foundation pit projects, such as purlins, crown beams, etc. They connect all the pile foundations to prevent the top and edge of the foundation pit from collapsing.

[0003] However, due to the limitation of the site, the planning and layout of the construction work surface and the need for tower crane hoisting during the construction of steel structure buildings, the tower crane foundation will collide with the foundation pit purlin. Especially in urban areas with many high-rise buildings, due to the limitation of the working surface and the hoisting needs during the construction of steel structure buildings, the purlin and the tower crane foundation will collide with each other. Under such working conditions, the purlin construction is difficult and it is difficult to continue the construction, which seriously affects the safety of the foundation pit and the working conditions in the pit.

[0004] Due to the limitations of the working surface and the influence of various factors such as the lifting requirements during the construction of the steel structure building, the on-site foundation pit purlins collided with the tower crane foundation. Under such operating conditions, the construction of the foundation pit purlins became difficult and it was difficult to continue construction, which seriously affected the safety of the foundation pit and the working conditions in the pit. Summary of the invention

[0005] The utility model aims to overcome the defects of the prior art, provides an avoidance structure between a foundation pit perimeter purlin and a tower crane foundation, and solves the problem that the perimeter purlin construction is difficult due to the tower crane foundation being too close to the perimeter purlin.

[0006] In order to solve the above technical problems, the utility model is achieved as follows:

[0007] A avoidance structure between a foundation pit purlin and a tower crane foundation, wherein the foundation pit purlin is surrounded by a plurality of concrete columns, the tower crane foundation is arranged on the inner side of the foundation pit purlin, and a plurality of support beams are arranged horizontally on the top of the foundation pit purlin; the avoidance structure is characterized in that: the H-shaped steel and an intermediate crossbeam are arranged, the H-shaped steel is arranged in the concrete column outside the tower crane foundation; the intermediate crossbeam is arranged between two adjacent support beams, and the intersection of the two adjacent support beams is eliminated so that they do not intersect.

[0008] The avoidance structure between the foundation pit purlin and the tower crane foundation is characterized in that it also includes a U-shaped support leg, and the U-shaped support leg is welded at the bottom of the H-shaped steel to support the H-shaped steel.

[0009] The avoidance structure between the foundation pit purlin and the tower crane foundation is characterized in that four hot-rolled ribbed steel bars are arranged around the H-shaped steel, and stirrups are added.

[0010] The described avoidance structure between the foundation pit collar beam and the tower crane foundation is characterized in that: the middle cross beam and the support beam are fixed by binding steel bars.

[0011] The described avoidance structure between the foundation pit collar beam and the tower crane foundation is characterized in that: it further includes a concrete slab, which is arranged at the position of the tower crane foundation, and the lattice column of the tower crane passes through the concrete slab.

[0012] The described avoidance structure between the foundation pit collar beam and the tower crane foundation is characterized in that: the thickness of the concrete slab is 200 mm.

[0013] The above-mentioned concrete slab is used as a strengthening plate for reinforcement. Due to the adjustment of the support layout on site, structural reinforcement is carried out on the position of some support beams after adjustment. A 200-mm-thick concrete slab is poured, and the lattice column of the tower crane passes through the slab. A circular hole is drilled with the center of the lattice column as the center of the circle, and the diameter of the hole is 400 mm.

[0014] The beneficial effect of the present utility model is: It can be seen from the above technical solutions that the present application provides an avoidance structure between the foundation pit collar beam and the tower crane foundation. To avoid the tower crane foundation, the thickness of the concrete column constituting the foundation pit collar beam is reduced, and H-shaped steel is placed in the concrete column; by adding H-shaped steel in the collar beam, the originally 1300*800 collar beam is adjusted to 700*800 according to this method, so that the collar beam and the tower crane foundation can avoid each other.

[0015] In view of the influence of irresistible factors on the working face and uncontrollable factors in construction requirements, the construction method of making an emergency avoidance between the foundation pit collar beam and the tower crane foundation can prevent the foundation pit collar beam and the tower crane foundation from colliding with each other, ensuring both the safety of the foundation pit retaining structure and the safe construction of the tower crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following further describes the present utility model in detail in conjunction with the drawings and embodiments:

[0017] Figure 1 Schematic diagram of arranging steel bars around the H-shaped steel.

[0018] Figure 2 For Figure 1 Schematic diagram in the top view direction.

[0019] Figure 3 Schematic diagram of the H-shaped steel.

[0020] Figure 4 Schematic diagram of the structure of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection requested by the present application.

[0022] like Figure 4 As shown: an avoidance structure between a foundation pit purlin and a tower crane foundation, the foundation pit purlin 5 is surrounded by a plurality of concrete columns, the tower crane foundation is arranged inside the foundation pit purlin, and a plurality of support beams are arranged horizontally on the top of the foundation pit purlin; the avoidance structure includes H-shaped steel and an intermediate cross beam, and in order to avoid the tower crane foundation, the thickness of the concrete column constituting the foundation pit purlin is reduced, and H-shaped steel is placed in the concrete column; the original 1300*800 purlin is adjusted to 700*800 according to this method;

[0023] An intermediate crossbeam 3 is arranged between two adjacent support beams 4, and the intersection of the two adjacent support beams is eliminated so that they do not intersect, thereby expanding the space between the support beams for placing the tower crane foundation.

[0024] It also includes a U-shaped support leg, and the U-shaped support leg is welded to the bottom of the H-shaped steel to support the H-shaped steel and lift it off the ground.

[0025] Four φ20 hot-rolled ribbed grade 3 steel bars are arranged around the H-shaped steel, and φ10@200 four-leg stirrups are added.

[0026] The middle cross beam and the supporting beam are fixed by steel bar binding.

[0027] It also includes a concrete slab, which is arranged at the tower crane foundation position, and the tower crane lattice column passes through the concrete slab; the concrete slab has a thickness of 200 mm.

[0028] The above concrete slab is used as a reinforcing plate. Due to the adjustment of the support arrangement on site, the structure of some support beams after the adjustment is reinforced, a 200mm thick concrete slab is poured, the tower crane lattice column passes through the slab, and a circular hole 6 is opened with the center of the lattice column as the center, and the hole diameter is 400mm.

[0029] Specific steps:

[0030] 1. Construction preparation

[0031] (1) Leveling the site: Use a PC200 excavator to remove surface and shallow debris and rocks to the bottom elevation of the second support beam. Use a pneumatic pick to break and clean the uneven concrete blocks under the tower crane foundation. Use a mini hydraulic excavator SY35U-10 in conjunction with manual excavation to excavate, clean and level the soil between the tower crane foundation and the retaining piles.

[0032] (2) Measurement and layout: Measure according to the coordinates and elevations on the drawings, use lime to lay out the lines and position, and control the construction of wooden formwork.

[0033] (3) Formwork construction: Use on-site measurement and positioning to install wooden formwork. The wooden formwork is spliced ​​smoothly and firmly with steel nails to prevent formwork from running and ensure that the cushion layer is installed accurately along the positioning axis.

[0034] (4) Concrete cushion pouring and felt laying: The purlin cushion concrete is 100mm thick C15 plain concrete. A tower crane is used to pour the concrete. The two sides are symmetrically alternated to prevent the formwork from running. If the formwork is offset, the pouring of concrete should be stopped immediately, the formwork should be reinforced, and the pouring can be continued after the axis is checked. After the pouring is completed, maintenance and waterproof felt should be laid in time.

[0035] (5) Trimming of retaining piles: To facilitate the construction of the purlin, use a pneumatic pick to chisel the protruding parts of the retaining piles neatly.

[0036] (6) Off-site welding of H-beam: Two 300*500*11*18 I-beams are butt-welded together on site to form hot-rolled H-beams.

[0037] 2. Construction of purlin

[0038] (1) H-beam lifting: Use a tower crane to lift the H-beam between the tower crane foundation and the retaining piles on site, and place the H-beam on the positioning axis with the help of manually laid sleepers.

[0039] (2) H-beam welded support legs: To facilitate the binding of the purlin reinforcement, construction workers welded U-shaped support legs at the bottom of the H-beam to prop up the H-beam and lift it off the ground.

[0040] 3. Installation of purlin reinforcement;

[0041] like Figure 1-3 As shown:

[0042] Place 4 φ20 hot-rolled ribbed grade 3 steel bars 2 in the upper, lower, left and right sides of the H-shaped steel, and add φ10@200 four-leg stirrups 1. Adjust the original 1300*800 perimeter purlin to 700*800 according to this method, with the reinforcement unchanged and the variable section length subject to the plane marked dimensions;

[0043] like Figure 4 As shown:

[0044] 4. Support beam adjustment: cancel the intersection of two adjacent support beams so that they do not intersect, and expand the space between the support beams for placing the tower crane foundation.

[0045] 5. Reinforcement of reinforcing plate: Due to the adjustment of support arrangement on site, structural reinforcement is carried out on the position of some supporting beams after the adjustment, a 200mm thick concrete slab is poured, the tower crane lattice column passes through the slab, and a circular hole is opened with the center of the lattice column as the center, and the hole diameter is 400mm.

[0046] 6. Add an intermediate cross beam: Since the span of the reinforced plate is large, a 400*700 intermediate cross beam is set in the middle. The intermediate cross beam is added and reinforced with steel bars.

[0047] 7. Concrete pouring

[0048] Formwork construction: The formwork adopts finished integral steel formwork, and the formwork reinforcement adopts steel pipe support. The support spacing is not more than 1m to ensure firm reinforcement, prevent formwork running, and ensure the accuracy of axis and clearance.

[0049] Concrete pouring: 56m truck pump C30 concrete is used on site. The truck pump is set up in a safe area of ​​the foundation pit. With manual pouring, the two sides are symmetrically alternated to prevent formwork from running. If the formwork is offset, the pouring of concrete should be stopped immediately, the formwork should be reinforced, and pouring can be continued after the axis is checked.

[0050] The above are only embodiments provided for the present application and are not intended to limit the present application. Although the present application is described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An avoidance structure between a foundation pit purlin and a tower crane foundation, wherein the foundation pit purlin is surrounded by a plurality of concrete columns, the tower crane foundation is arranged inside the foundation pit purlin, and a plurality of support beams are arranged horizontally on the top of the foundation pit purlin; the characteristics are: The avoidance structure includes H-shaped steel and an intermediate crossbeam. The H-shaped steel is arranged in the concrete column outside the tower crane foundation; the intermediate crossbeam is arranged between two adjacent support beams, and the intersection of the two adjacent support beams is eliminated so that they do not intersect.

2. The avoidance structure between the foundation pit purlin and the tower crane foundation according to claim 1 is characterized by: It also includes a U-shaped support leg, and the U-shaped support leg is welded to the bottom of the H-shaped steel to support the H-shaped steel.

3. The avoidance structure between the foundation pit purlin and the tower crane foundation according to claim 1, characterized in that: Four hot-rolled ribbed steel bars are arranged around the H-shaped steel, and stirrups are added.

4. The avoidance structure between the foundation pit purlin and the tower crane foundation according to claim 1, characterized in that: The middle cross beam and the supporting beam are fixed by steel bar binding.

5. The avoidance structure between the foundation pit purlin and the tower crane foundation according to claim 1, characterized in that: The utility model also comprises a concrete plate which is arranged at the tower crane foundation position, and the tower crane lattice column passes through the concrete plate.

6. The avoidance structure between the foundation pit purlin and the tower crane foundation according to claim 5, characterized in that: The thickness of the concrete slab is 200 mm.

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