Large deep foundation pit rotating trestle

Abstract

The utility model relates to a large-scale deep foundation pit rotary trestle which comprises a trestle body and a supporting body which are integrated, the supporting body is arranged below the trestle body, the trestle body is divided into a straight section, a rotary slope section and a soil slope ramp, the straight sections are respectively arranged on the edge of the top of the foundation pit, among the rotary slope sections and at the tail ends of the rotary slope sections, the rotary slope sections are arranged between the two straight sections, the tail end of the last straight section is provided with a soil slope ramp, and the soil slope ramp is directly communicated with the bottom of the large-scale deep foundation pit. The bottom construction of the deep foundation pit is not affected, the construction difficulty of the deep foundation pit is reduced, the construction efficiency is high, the bearing capacity is high, the construction transportation capacity of the deep foundation pit is improved, the transportation efficiency is improved, and the construction progress of the deep foundation pit is accelerated.

Description

Technical Field

[0001] The utility model relates to the technical field of deep foundation pit rotary trestle construction, in particular to a large deep foundation pit rotary trestle. Background Art

[0002] With the current high-quality and high-speed development of the country, there are more and more large-scale and complex deep foundation pit engineering projects. Most of the construction sites are located in densely populated urban areas with complex surrounding construction environments. The construction sites are relatively small. To ensure the transportation of earth and stone and materials, the vertical transportation of earth and stone is usually carried out by reserving soil ramps and hardening them for vehicle traffic. However, due to the large overall construction depth of some projects and the maximum excavator arm length of 12 meters, the construction site is too tight and the traditional straight ramp cannot meet the transportation needs.

[0003] In the past, the types of trestles commonly used in China include: reserved earth trestles, earth-rock combined trestles, straight section + slope section trestles, pure steel structure trestles and prefabricated steel trestles. These methods have large excavation areas and are difficult to construct. They are not suitable for the transportation of earth and stone in large and complex deep foundation pits and have low transportation efficiency. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the utility model provides a large-scale deep foundation pit rotating trestle, which adopts the trestle and support as the same body, and the strength of the trestle is reinforced by a mixture of steel structure and concrete. The trestle adopts the internationally leading rotating trestle design concept of rotating + straight section + earth slope ramp structure for the construction and transportation of deep foundation pits, which increases the load capacity of construction and transportation, occupies a small area for construction, and reduces the construction difficulty. During transportation, the combination of rotating slope + straight section reduces the transportation difficulty of deep foundation pit construction, improves transportation efficiency, improves the adaptability of high-speed, large and complex deep foundation pits to the construction speed, and ensures the construction progress of large deep foundation pits.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A large deep foundation pit rotating trestle comprises a trestle and a support body, wherein the support body and the trestle are integrally formed and the support body is arranged below the trestle, and the trestle is divided into a straight section, a rotating slope section and an earth slope ramp, wherein the straight sections are respectively arranged at the top edge of the foundation pit, between the rotating slope sections and at the tail end of the rotating slope section, a rotating slope section is arranged between two straight sections, and an earth slope ramp is arranged at the tail end of the last straight section, and the earth slope ramp directly leads to the bottom of the large deep foundation pit.

[0007] Furthermore, the trestle is divided into a trestle deck and an internal supporting structure. The internal supporting structure is arranged on the lower surface of the trestle deck, the internal supporting structure is fixedly connected to the supporting body, and the internal supporting structure is supported by a steel structure frame.

[0008] Furthermore, the support body includes a lattice column and a steel cage. The lattice column is supported on the lower surface of the trestle. The steel cage is arranged inside the space of the lattice column. The four sides of the lattice column are fixedly connected to the steel cage. The main reinforcement of the steel cage is connected to the side of the lattice column using oblique steel bars.

[0009] Furthermore, the lattice columns use angle steel joints, the angle steel joints of the same cross section do not exceed 50% of the cross section, the adjacent angle steels are staggered at not less than 60cm, and the angle steel joints are reinforced with short angle steels of the same material on the inner side of the angle steel at the connection position.

[0010] Furthermore, a positioning rib is provided on the main reinforcement of the steel cage every 2m, and the positioning ribs are equally distributed at 360°, with a total of 4 ribs.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. The combination of lattice columns and steel cages is fixedly connected to the supporting structure inside the trestle, with strong bearing capacity, which improves the transportation capacity of deep foundation pit construction, improves transportation efficiency, and speeds up the progress of deep foundation pit construction.

[0013] 2. The trestle adopts a rotating + straight section + earth slope ramp structure, which has a small excavation working surface and a small construction workload. The trestle occupies a small area of ​​the deep foundation pit and does not affect the bottom construction of the deep foundation pit, thereby reducing the difficulty of deep foundation pit construction and improving construction efficiency. It improves the adaptability of the construction speed of large and complex deep foundation pits and ensures the construction progress of large deep foundation pits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic diagram of a large deep foundation pit rotating trestle structure.

[0015] Figure 2 The utility model is a schematic diagram of the expansion of a large deep foundation pit rotating trestle structure.

[0016] Figure 3 It is a flow chart of the rotary trestle construction method of the utility model.

[0017] Figure 4 It is a schematic diagram of the welding structure of the lattice column and the steel cage described in the present invention.

[0018] Figure 5 It is a cross-sectional schematic diagram of the guide frame described in the present utility model.

[0019] Figure 6 It is a schematic diagram of the scissors support of the trestle described in the utility model.

[0020] In the figure: 1. Pier platform; 2. First straight section; 3. First rotating slope section; 4. Middle straight section; 5. Last rotating slope section; 6. Last straight section; 7. Earth slope ramp; 8. Lattice column; 9. Steel cage; 10. Scissor brace; 11. Connecting beam; 12. Deep foundation pit; 13. Guide frame. DETAILED DESCRIPTION

[0021] The specific implementation of the utility model is further described below:

[0022] In the description of this patent, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this utility model: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0023] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here shall be interpreted accordingly. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0024] like Figures 1-6As shown, a large deep foundation pit rotating trestle includes a trestle and a support body, wherein the support body and the trestle are integral, and the support body is arranged below the trestle, and the trestle is divided into a straight section, a rotating slope section and an earth slope ramp. A trestle platform 1 is arranged on the upper plane of the foundation pit, and the trestle platform 1 is connected to the first straight section 2, the first straight section 2 is connected to the first rotating slope section 3, the first rotating slope section 3 is connected to the middle straight section 4, the middle straight section 4 is connected to the tail rotating slope section 5, the tail rotating slope section 5 is connected to the tail straight section 6, the tail end of the tail straight section 6 is connected to the earth slope ramp 7, and the other end of the earth slope ramp 7 leads directly to the bottom of the large deep foundation pit 12.

[0025] Furthermore, the trestle is divided into a trestle deck and an internal supporting structure. The internal supporting structure is arranged on the lower surface of the trestle deck, the internal supporting structure is fixedly connected to the supporting body, and the internal supporting structure is supported by a steel structure frame.

[0026] Furthermore, the support body includes a lattice column 8 and a steel cage 9. The lattice column 8 is supported on the lower surface of the trestle, and the steel cage 9 is arranged inside the space of the lattice column 8. The four sides of the lattice column 8 are fixedly connected to the steel cage 9. The main reinforcement of the steel cage 9 is connected to the side of the lattice column 8 by oblique steel bars. After the steel cage 9 is inserted into the hole, a positioning guide frame 13 is installed at the position of the lattice column 8. The positioning hole in the middle of the guide frame 13 is 50 mm larger than the lattice column on each side, which is convenient for screw inspection connection and column position adjustment. The lattice columns 8 are laid in layers and connected with connecting beams 11. Scissors struts 10 are arranged between the lattice columns 8 and the connecting beams 11. The scissors struts 10 are cross-arranged, and one end of the scissors struts 10 is located at the bottom of the upper connecting beam 11, and the other end is located at the top of the connecting beam 11. The scissors struts 10 increase the supporting force of the lattice column 8.

[0027] Furthermore, the lattice columns 8 are made of angle steel joints, with the number of angle steel joints of the same cross section not exceeding 50% of the cross section, and the staggered positions of adjacent angle steels not less than 60 cm. The angle steel joints are reinforced with short angle steels of the same material on the inner side of the angle steel at the connection position.

[0028] Furthermore, a positioning rib is provided on the main reinforcement of the steel cage 9 every 2 m, and the positioning ribs are equally divided into 360°, with a total of 4 ribs.

[0029] like Figures 1-6As shown, the structural features of the large-scale deep foundation pit rotating trestle are as follows: the circular trestle spirals downhill from the top of the first straight section 1 to 9 meters above the foundation pit bottom. Subsequent elevation differences are excavated using an earthen slope ramp 7. The circular trestle ramp is made of reinforced concrete and has a slope of 1:8. An earthen slope ramp 7 is provided at the bottom to the bottom of the deep foundation pit 12 for vehicle traffic. The completion of the rotating trestle construction relieves the pressure of controlling the progress of the later stage of earthwork excavation. The bottom of the trestle is supported by steel columns for lattice columns 8. The lattice columns 8 are composed of steel columns and concrete column piles. The upper steel columns are steel components, and the lower column piles are reinforced concrete bored cast-in-place pile foundations. The rotating trestle occupies a small area, is conducive to deep foundation pit transportation operations, has a high load capacity, and increases transportation capacity.

[0030] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A large deep foundation pit rotating trestle, comprising a trestle and a support body, characterized in that: The support body and the trestle are integrally formed, and the support body is arranged below the trestle. The trestle is divided into a straight section, a rotating slope section and an earth slope ramp. The straight sections are arranged at the top edge of the foundation pit, between the two rotating slope sections and at the tail end of the rotating slope section. A rotating slope section is arranged between the two straight sections, and an earth slope ramp is arranged at the tail end of the last straight section. The earth slope ramp leads directly to the bottom of the large deep foundation pit.

2. A large deep foundation pit rotating trestle according to claim 1, characterized in that: The trestle is divided into a trestle deck and an internal supporting structure. The internal supporting structure is arranged on the lower surface of the trestle deck, is fixedly connected to the supporting body, and is supported by a steel structure frame.

3. A large deep foundation pit rotating trestle according to claim 1, characterized in that: The support body includes a lattice column and a steel cage. The lattice column is supported on the lower surface of the trestle. The steel cage is arranged inside the lattice column space. The four sides of the lattice column are fixedly connected to the steel cage. The main reinforcement of the steel cage is connected to the side of the lattice column with oblique steel bars.

4. A large deep foundation pit rotating trestle according to claim 2, characterized in that: The lattice columns use angle steel joints, the angle steel joints of the same section do not exceed 50% of the section, the adjacent angle steels are staggered at not less than 60cm, and the angle steel joints are reinforced with short angle steels of the same material on the inner side of the angle steel at the connection position.

5. A large deep foundation pit rotating trestle according to claim 2, characterized in that: A positioning bar is set every 2m on the main reinforcement of the steel cage, and the positioning steel bars are arranged equally at 360 degrees, with a total of 4 bars.

Images