A trestle deck structure

Abstract

The utility model relates to a foundation pit construction technology field especially relates to a trestle board structure, including first trestle board, first trestle board is connected in two along the first crown beam top surface of longitudinal layout of foundation pit respectively, first trestle board is supported through first trestle beam along the foundation pit horizontal arrangement and along the second trestle beam of longitudinal arrangement of foundation pit, first trestle beam is the most top of foundation pit concrete support, the most top concrete support is supported through first lattice column, the most top concrete support below still is equipped with second lattice column, the second trestle beam is connected in first trestle beam and is equipped with second lattice column place, first trestle board is equipped with the opening, the width of opening adapts the arrangement interval of concrete support, the length of opening adapts the interval of second lattice column along the foundation pit horizontal arrangement. Shorten earthwork horizontal transfer distance, still can be through the steel support in the self support system of opening place and lower, be favorable to shortening the time of no support exposure, be favorable to the deformation control of deep foundation pit.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit construction technology, and in particular to a trestle structure. Background Technology

[0002] Subway stations are mostly deep, strip-shaped foundation pits. Some subway stations are located in urban areas where land is extremely scarce, resulting in an exceptionally narrow site environment. This makes the temporary roads outside the foundation pit even narrower, severely affecting the efficiency of traffic organization within the site and increasing the difficulty of coordinating construction within the site. Therefore, trestle platforms are often added to the foundation pit. However, adding trestle platforms will greatly affect the efficiency of horizontal earthwork transportation below them, and the construction of steel supports also requires the excavation of long passages. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology, which involves adding a trestle plate to a strip-shaped deep foundation pit, resulting in low soil removal efficiency under the trestle plate, troublesome lowering of steel supports, and long exposure time without support. The present invention provides a trestle plate structure.

[0004] This utility model provides a trestle structure, including a first trestle, which is connected to the top surfaces of two first capping beams arranged longitudinally along the foundation pit. The first trestle is supported by a first trestle bridge arranged transversely along the foundation pit and a second trestle bridge arranged longitudinally along the foundation pit. The first trestle bridge is the uppermost concrete support of the foundation pit, which is supported by a first lattice column. A second lattice column is also provided below the uppermost concrete support. The second trestle bridge is connected to the first trestle bridge where the second lattice column is located. The first trestle has an opening, the width of which is adapted to the arrangement spacing of the concrete supports, and the length of which is adapted to the spacing of the second lattice columns transversely along the foundation pit.

[0005] The first capping beam is the capping beam in the foundation pit's self-supporting system; the concrete support is the concrete bracing in the foundation pit's self-supporting system; the uppermost concrete support is the first concrete bracing during the excavation process; and the first lattice column is the vertical support structure below the concrete bracing in the self-supporting system. The second trestle bridge and the second lattice column are added to accommodate the first trestle bridge slab with openings.

[0006] The width of the opening (along the longitudinal direction of the foundation pit) is adapted to the arrangement spacing of the concrete supports (along the longitudinal direction of the foundation pit), and the length of the opening (along the transverse direction of the foundation pit) is adapted to the spacing of the second lattice columns along the transverse direction of the foundation pit (the width direction of the strip foundation pit), so that there are no lattice columns without vertical support below the opening area, thereby facilitating the removal of soil and the lowering of construction equipment and components.

[0007] The trestle structure described in this utility model facilitates passage between the two sides of the foundation pit. The trestle structure fully utilizes the foundation pit's own support structure, increasing the construction workspace and improving site utilization. The openings effectively reduce the width of the trestle panels, shortening the horizontal transport distance of earthwork. Furthermore, the steel supports within the foundation pit's own support system can be lowered through the openings, eliminating the need for pre-excavation of long passages. After excavating two supports, the steel supports can be hoisted through the pre-drilled holes in the trestle panels, shortening the unsupported exposure time and improving deformation control in deep foundation pits.

[0008] Preferably, the first crown beam includes a sunken section and a standard section, the first trestle plate is connected to the sunken section, and the top surface of the first trestle plate is flush with the top surface of the standard section of the first crown beam.

[0009] Preferably, the height of the sunken section is less than the height of the standard section.

[0010] Preferably, there is a transition section between the sunken section and the standard section.

[0011] Preferably, the bottom slope of the transition section is 1:8-1:10.

[0012] Preferably, the opening is located at the end of the first trestle deck near one of the first cap beams.

[0013] Preferably, the opening has a beveled edge, which is arranged along the line connecting the second lattice column and the corresponding first lattice column, and the second trestle bridge is used to connect the corresponding second lattice column and the first lattice column.

[0014] The side of the opening facing the inside of the pit has a sloping edge, which facilitates the placement of machinery, equipment, and tools along the sloping edge to enable construction work to be carried out at the opening.

[0015] Preferably, the first trestle plate is located near one of the end wells of the foundation pit. Preferably, the end well is provided with a second trestle plate along the longitudinal direction of the foundation pit. One side of the second trestle plate is cantilevered and connected to the side of the second capping beam at the end well, and the other side of the second trestle plate is flush with the inner side of the first capping beam.

[0016] Further improve the efficiency of transportation within the venue and make reasonable use of the venue space.

[0017] Preferably, the first trestle plate, the second trestle plate, and the second trestle bridge are all reinforced concrete structures.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a trestle structure. By setting up trestle panels, passage between the two sides of the foundation pit is facilitated. The trestle panels make full use of the foundation pit's own support structure system, increasing the construction work space within the construction site and improving the utilization rate of the construction site. The openings effectively reduce the width of the trestle panels in certain areas, shortening the horizontal transport distance of earthwork. The steel supports in the self-supporting system can also be lowered through the openings without the need to excavate a long passage in advance. After excavating two supports, the steel supports can be hoisted through the reserved holes in the trestle panels to complete the erection, which helps to shorten the time of unsupported exposure and is beneficial to the deformation control of deep foundation pits. Attached Figure Description

[0019] Figure 1 This is a plan view of a trestle structure according to the present invention; Figure 2 This is a partial elevation view of a trestle structure according to the present invention; Figure 3 This is another planar schematic diagram of a trestle structure according to the present invention; Figure 4 This is a schematic diagram of the excavation of a trestle deck structure according to the present invention.

[0020] icon: 0-Foundation pit, 01-End well, 11-First trestle deck, 12-Second trestle deck, 2-First capping beam, 21-Sinking section, 22-Standard section, 23-Transition section, 31-First trestle bridge, 32-Second trestle bridge, 41-First lattice column, 42-Second lattice column, 5-Opening, 6-Second capping beam. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0022] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0024] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0025] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0026] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0027] Example 1 like Figures 1 to 2As shown, a trestle structure includes a first trestle 11, which is connected to the top surfaces of two first cap beams 2 arranged longitudinally along the foundation pit 0. The first trestle 11 is supported by a first trestle bridge 31 arranged transversely along the foundation pit 0 and a second trestle bridge 32 arranged longitudinally along the foundation pit 0. The first trestle bridge 31 is the uppermost concrete support of the foundation pit 0, which is supported by a first lattice column 41. A second lattice column 42 is also provided below the uppermost concrete support. The second trestle bridge 32 is connected to the first trestle bridge 31 where the second lattice column 42 is located. The first trestle 11 has an opening 5, the width of which is adapted to the arrangement spacing of the concrete supports, and the length of which is adapted to the spacing of the second lattice columns 42 transversely along the foundation pit 0.

[0028] Specifically, in this embodiment, along Figure 1 The left-right direction is the longitudinal direction of the foundation pit 0, and the up-down direction is the transverse direction of the foundation pit 0. The connectors between the first lattice columns 41 in the foundation pit 0's self-supporting system are reinforced concrete tie rods. The first trestle bridge 31 and the second trestle bridge 32 can have the same beam width and height. The dimensions of the second trestle bridge 32 are larger than the conventional tie rod dimensions. The first capping beam 2 includes a sunken section 21 and a standard section 22. A transition section 23 connects the sunken section 21 and the standard section 22. The sunken section 21 is the location that supports the first trestle bridge slab 11. The transition sections 23 are on both sides of the sunken section 21. The capping beams at other locations are standard sections 22. The height of the sunken section 21 is less than the height of the standard section 22. Figure 2 As shown, the bottom slope of the transition section 23 is 1:8-1:10. The first trestle 11 is connected to the sunken section 21. The top surface of the first trestle 11 is flush with the top surface of the standard section 22 of the first cap beam 2. The thickness of the first trestle 11 is selected according to the actual situation. The first trestle 11 and the second trestle bridge 32 are reinforced concrete structures. The steel bars of the first trestle 11 are anchored into the first cap beam 2 and the second trestle bridge 32.

[0029] The location of opening 5 can vary depending on the actual situation. For example, in this embodiment, opening 5 is located at... Figure 1 The first crown beam 2 on the upper middle side can also be moved to the lower side or placed in the middle.

[0030] The foundation pit 0 has end wells 01 on both sides, and a first trestle plate 11 is installed near one of the end wells 01. Each end well 01 has a second trestle plate 12 extending longitudinally along the foundation pit 0. One side of the second trestle plate 12 is cantilevered to the side of the second capping beam 6 at the end well 01, and the other side of the second trestle plate 12 is flush with the inner side of the first capping beam 2. The second trestle plate 12 is also made of reinforced concrete, and its thickness is set according to actual needs; typically, its thickness can be less than that of the first trestle plate 11.

[0031] In some alternative embodiments, the side of the opening 5 facing the interior of the pit 0 is a sloping side, such as... Figure 3 As shown, the hypotenuse is arranged along the line connecting the second lattice column 42 and the corresponding first lattice column 41. Figure 1 The original second lattice column 42 can be removed), and the second trestle bridge 32 is replaced by connecting the corresponding second lattice column 42 and the first lattice column 41, so that beam structures are provided around the opening 5. The inclined structure facilitates the placement of mechanical equipment and tools along the inclined side, so as to facilitate construction work at the opening 5.

[0032] The excavation of foundation pit 0 needs to be carried out in layers. Each layer of excavation requires the installation of concrete bracing, and steel supports will be installed between the upper and lower layers of concrete bracing (see...). Figure 2 In existing technologies, if a bridge plate is used, as shown in the following example... Figure 4 The excavation direction is usually as follows: after the earthwork at the positions of steel supports #1 and #2 is completed, steel supports are lowered from the right side of the trestle to complete the erection of steel supports #1 and #2. Then, the passage between steel supports #3 and #8 is excavated first, and then the earthwork at the positions of steel supports #3 and #4 is excavated. The excavator moves to steel support #8 and transports the steel support to the positions of steel supports #3 and #4 to complete the erection. Then, steel supports #5, #6, #7, and #8 are excavated and erected in the same manner.

[0033] Using the bridge plate structure in this application, such as Figure 4 As shown, after the earthwork excavation at the locations of steel supports #1 and #2 is completed, steel supports are lowered from the right side of the first trestle slab 11 to complete the erection of steel supports #1 and #2. Then, the locations of steel supports #3 and #4 are excavated, and steel supports are hoisted from the opening 5 to complete steel supports #3 and #4. Then, the locations of steel supports #5 and #6 are excavated, and steel supports are hoisted from the opening 5 to complete steel supports #5 and #6. Subsequently, the construction of steel supports #7 and #8 is carried out. This effectively shortens the horizontal transportation distance of earthwork and allows steel supports from the self-supporting system to be lowered through the openings without the need to excavate a long passage in advance. After excavating two supports, steel supports can be hoisted through the reserved holes in the trestle slab to complete the erection, which helps to shorten the time of exposure without support and is beneficial to the deformation control of deep foundation pits.

[0034] The above content is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bridge deck structure, characterized in that, The first trestle plate (11) is connected to the top surface of two first cap beams (2) arranged longitudinally along the foundation pit (0). The first trestle plate (11) is supported by a first trestle bridge (31) arranged transversely along the foundation pit (0) and a second trestle bridge (32) arranged longitudinally along the foundation pit (0). The first trestle bridge (31) is the uppermost concrete support of the foundation pit (0). The uppermost concrete support is supported by a first lattice column (41). A second lattice column (42) is also provided below the uppermost concrete support. The second trestle bridge (32) is connected to the first trestle bridge (31) where the second lattice column (42) is provided. The first trestle plate (11) has an opening (5). The width of the opening (5) is adapted to the arrangement spacing of the concrete support. The length of the opening (5) is adapted to the spacing of the second lattice column (42) along the transverse direction of the foundation pit (0).

2. The trestle structure according to claim 1, characterized in that, The first crown beam (2) includes a sunken section (21) and a standard section (22). The first trestle plate (11) is connected to the sunken section (21), and the top surface of the first trestle plate (11) is flush with the top surface of the standard section (22) of the first crown beam (2).

3. The bridge deck structure according to claim 2, characterized in that, The height of the sunken section (21) is less than the height of the standard section (22).

4. The bridge deck structure according to claim 3, characterized in that, There is a transition section (23) between the sunken section (21) and the standard section (22).

5. A bridge deck structure according to claim 4, characterized in that, The bottom slope of the transition section (23) is 1:8-1:

10.

6. A bridge deck structure according to any one of claims 1-5, characterized in that, The opening (5) is located at the end of the first trestle (11) near one of the first cap beams (2).

7. A bridge deck structure according to claim 6, characterized in that, The opening (5) has a sloping side, which is arranged along the line connecting the second lattice column (42) and the corresponding first lattice column (41). The second trestle bridge (32) is alternately connected between the corresponding second lattice column (42) and the first lattice column (41).

8. A trestle structure according to claim 6, characterized in that, The first trestle plate (11) is set near one of the end wells (01) of the foundation pit (0).

9. A bridge deck structure according to claim 8, characterized in that, The end well (01) is provided with a second trestle plate (12) along the longitudinal direction of the foundation pit (0). One side of the second trestle plate (12) is cantilevered and connected to the side of the second crown beam (6) at the end well (01). The other side of the second trestle plate (12) is flush with the inner side of the first crown beam (2).

10. A trestle structure according to claim 9, characterized in that, The first trestle plate (11), the second trestle plate (12), and the second trestle bridge (32) are all reinforced concrete structures.

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