Permanent and temporary logistics channel in super large foundation pit and its construction method

Abstract

The present invention relates to a permanent and temporary logistics channel in a super-large foundation pit, comprising: a plurality of pipe piles buried below the bottom surface of the foundation pit and with the top portions protruding from the bottom surface of the foundation pit; a channel layer arranged above the bottom surface of the foundation pit, through which the tops of the pipe piles in the corresponding channel layer area are buried and the top surfaces of the pipe piles are exposed, the height of the channel layer being greater than the height of the pipe piles above the bottom surface of the foundation pit; and a cover plate detachably arranged on the tops of the pipe piles in the corresponding channel layer area, the top surface of the cover plate being flush with the top surface of the channel layer. The heavy construction of breaking and cleaning the channel layer is avoided, the construction progress is accelerated, and the construction cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of construction, and in particular to a permanent and temporary logistics channel in a super-large foundation pit and a construction method thereof. Background Art

[0002] During the construction process, for projects with large site areas and tight construction schedules, in terms of material transportation, if tower cranes are used for horizontal and vertical transportation on site, the tower cranes need to be transferred layer by layer to lift materials such as steel bars and formwork from the steel bars and woodworking processing plants around large-scale buildings to the construction site. This material transportation method is inefficient, and if the site around the construction environment is relatively narrow, it is impossible to use a pure tower crane method for transportation. For this kind of construction environment, it is necessary to combine tower crane transportation and temporary logistics channels to achieve efficient material transportation and speed up the construction progress. The existing temporary logistics channel is formed by pouring concrete directly on the bottom of the foundation pit. The structural strength of the temporary physical channel is not enough, and it is impossible to continue the construction of the cushion layer and the bottom plate on this basis. This temporary logistics channel needs to be broken after the main structure construction of other areas outside the logistics channel area is completed, and then the main structure of the logistics channel area is constructed. However, the construction workload of breaking and cleaning the temporary logistics channel is large, the construction progress is slow, and the construction cost is high.

[0003] Therefore, there is an urgent need to provide a permanent and temporary logistics channel and a construction method in a super-large foundation pit that can reduce construction investment, speed up construction progress, and save construction costs to solve the above-mentioned technical problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a permanent and temporary logistics channel in a super-large foundation pit to solve the problems of large construction workload, slow construction progress and high construction cost in demolition and cleaning of existing temporary logistics channels.

[0005] To achieve the above-mentioned purpose, the present invention provides a permanent and temporary logistics channel in a super-large foundation pit, which is arranged in the foundation pit, and the logistics channel comprises:

[0006] A plurality of pipe piles buried below the bottom surface of the foundation pit and with top portions protruding above the bottom surface of the foundation pit;

[0007] a channel layer disposed above the bottom surface of the foundation pit, through which the top ends of the pipe piles corresponding to the channel layer area are buried and the top surfaces of the pipe piles are exposed, and the height of the channel layer is greater than the height of the pipe piles above the bottom surface of the foundation pit; and

[0008] A cover plate is detachably arranged on the top of the pipe pile corresponding to the channel layer area, and the top surface of the cover plate is flush with the top surface of the channel layer.

[0009] The present invention combines the pipe piles with the channel layer, so that the channel layer has good structural strength and can serve as a part of the main structure in the foundation pit; and the top ends of the pipe piles corresponding to the channel layer area are detachably covered with a cover plate, the top surface of the cover plate is flush with the top surface of the channel layer, so that the cover plate can be used as a transportation road surface. When it is necessary to construct the foundation floor layer in the foundation pit, it is only necessary to remove the cover plate, and further construct the foundation floor layer on the basis of the channel layer, thereby avoiding the heavy construction of breaking and cleaning the channel layer, speeding up the construction progress, and saving construction costs.

[0010] A further improvement of the logistics channel of the permanent structure in the super-large foundation pit of the present invention is that an upper steel bar layer located above the channel layer and a lower steel bar layer located below the channel layer are transversely arranged in the channel layer.

[0011] A further improvement of the logistics channel of the permanent structure in the super-large foundation pit of the present invention is that a structural cushion layer is arranged on the bottom surface of the foundation pit except for the position of the channel layer;

[0012] The structural cushion layer is fixedly connected to the channel layer;

[0013] The height of the channel layer is greater than the height of the structural cushion layer.

[0014] A further improvement of the logistics channel of the permanent structure in the super-large foundation pit of the present invention is that a longitudinal steel mesh is vertically arranged at the intersection of the channel layer and the structural cushion layer.

[0015] A further improvement of the logistics channel of the permanent structure in the super-large foundation pit of the present invention is that the concrete strength of the channel layer is greater than the concrete strength of the structural cushion layer.

[0016] The present invention also provides a construction method for a permanent and temporary logistics channel in a super-large foundation pit, which is arranged in the foundation pit and is characterized in that the construction method comprises the following steps:

[0017] Driving the pipe piles at the positions where the pipe piles are to be constructed;

[0018] Excavating the earth at the location to be constructed of the foundation pit and digging to the elevation of the structural cushion layer;

[0019] Mark out the area of ​​the channel layer by surveying and laying out lines;

[0020] Installing a temporary baffle cover on the top of the pipe pile corresponding to the channel layer area;

[0021] The channel layer and the structural cushion layer are constructed simultaneously, the top surface of the channel layer is flush with the top surface of the temporary baffle, and the height of the channel layer is greater than the height of the structural cushion layer; and

[0022] After the concrete of the channel layer is hardened, the temporary baffle is taken out, and a cover plate is placed on the top of the corresponding pipe pile, so that the channel layer is used as a logistics channel.

[0023] A further improvement of the construction method of the permanent temporary structure in the super-large foundation pit of the present invention is that the simultaneous construction of the channel layer and the structural cushion layer comprises the following steps:

[0024] Binding and fixing the upper steel bar layer and the lower steel bar layer in the area of ​​the channel layer;

[0025] vertically arranging a longitudinal steel mesh at the intersection of the channel layer and the structural cushion layer; and

[0026] At the same time, concrete is poured in the area of ​​the channel layer and the area of ​​the structural cushion layer. The concrete of the channel layer is poured until it is flush with the top surface of the temporary baffle, and the concrete height of the structural cushion layer is lower than the top surface of the pipe pile.

[0027] A further improvement of the construction method of the permanent temporary structure in the super-large foundation pit of the present invention is that after the logistics channel is used, a foundation bottom plate layer is constructed on the logistics channel and the structural cushion layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the foundation pit and pipe piles of the permanent and temporary logistics channel in the super-large foundation pit of the present invention.

[0029] Figure 2 It is a cross-sectional view of the permanent and temporary combined logistics channel in the super-large foundation pit of the present invention.

[0030] Figure 3 for Figure 2 A partial enlarged view of .

[0031] Figure 4 It is a cross-sectional view of the permanent temporary structure in the super-large foundation pit of the present invention.

[0032] Figure 5 for Figure 4 A partial enlarged view of . DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] The present invention provides a permanent and temporary logistics channel in a super-large foundation pit, which is arranged in the foundation pit. The permanent and temporary logistics channel in the super-large foundation pit of the present invention comprises: a plurality of pipe piles buried under the bottom surface of the foundation pit and with the top part protruding from the bottom surface of the foundation pit, a channel layer arranged above the bottom surface of the foundation pit, and a cover plate detachably arranged on the top of the pipe piles corresponding to the channel layer area. By combining the pipe piles with the channel layer, the channel layer has good structural strength and can be used as a part of the main structure in the foundation pit; and the top of the pipe piles corresponding to the channel layer area is detachably covered with a cover plate, the top surface of the cover plate is flush with the top surface of the channel layer so that the cover plate can be used as a transportation road surface. When it is necessary to construct the foundation floor layer in the foundation pit, it is only necessary to remove the cover plate and further construct the foundation floor on the basis of the channel layer, thereby avoiding the heavy construction of breaking and cleaning the channel layer, speeding up the construction progress and saving the construction cost.

[0035] The permanent and temporary logistics channel in the super-large foundation pit of the present invention is described below with reference to the accompanying drawings.

[0036] See also Figure 2 , showing a cross-sectional view of a permanent and temporary logistics channel in a super-large foundation pit of the present invention. In this embodiment, a permanent and temporary logistics channel in a super-large foundation pit is provided in a foundation pit 1, and the logistics channel comprises: a plurality of pipe piles 2 buried below the bottom surface of the foundation pit 1 and with the top portions protruding from the bottom surface of the foundation pit 1, a channel layer 3 provided above the bottom surface of the foundation pit 1, and a cover plate 21 detachably provided on the top of the pipe piles 2 corresponding to the channel layer 3 area. The top of the pipe piles 2 corresponding to the channel layer 3 area is buried by the channel layer 3 and the top surface of the pipe piles 2 is exposed. This design of combining the pipe piles with the channel layer enables the channel layer 3 to have good structural strength and thus can be used as a part of the main structure in the foundation pit 1.

[0037] See also Figure 2 and Figure 3 In one embodiment, the height of the channel layer 3 is greater than the height of the pipe pile 2 above the bottom surface of the foundation pit 1, so that after the cover plate 21 is placed on the top surface of the corresponding pipe pile 2, it can be ensured that the top surface of the cover plate 21 is flush with the top surface of the channel layer 3. The top surface of the cover plate 21 is flush with the top surface of the channel layer 3, so that the cover plate 21 can be used as a transportation road surface, and when it is necessary to construct the foundation bottom plate layer 5 in the foundation pit 1, it is only necessary to remove the cover plate 21 and further construct the foundation bottom plate layer 5 on the basis of the channel layer 3, avoiding the heavy construction of breaking and cleaning the channel layer 3, speeding up the construction progress, and saving construction costs. Specifically, the cover plate 21 is a steel plate with a thickness of 20 mm.

[0038] See also Figure 3An upper steel bar layer 31 located at the upper part of the channel layer 3 and a lower steel bar layer 32 located at the lower part of the channel layer 3 are transversely arranged in the channel layer 3. The upper steel bar layer 31 and the lower steel bar layer 32 enhance the structural strength of the channel layer 3 and ensure that the channel layer 3 has good bearing capacity and anti-deformation ability.

[0039] See also Figure 2 and Figure 3 Furthermore, a structural cushion layer 4 is arranged above the bottom surface of the foundation pit 1 except for the position of the channel layer 3. The structural cushion layer 4 is fixedly connected to the channel layer 3. The height of the channel layer 3 is greater than the height of the structural cushion layer 4 to ensure that the channel layer 3 has good structural strength and bearing capacity. Figure 4 and Figure 5 The portion of the channel layer 3 that is higher than the structural cushion layer 4 and the portion of the pipe piles 2 located in the area of ​​the structural cushion layer 4 that protrudes from the structural cushion layer 4 will be buried in the foundation slab layer 5 during the subsequent construction of the foundation slab layer 5. This structure can increase the connection strength between the foundation slab layer 5 and the pipe piles 3, the channel layer 3 and the structural cushion layer 4, thereby increasing the overall structural strength and firmness.

[0040] See also Figure 2 Furthermore, a longitudinal steel mesh 33 is vertically arranged at the intersection of the channel layer 3 and the structural cushion layer 4. On the one hand, the longitudinal steel mesh 33 enhances the structural strength of the channel layer 3. On the other hand, the longitudinal steel mesh 33 facilitates the construction of concrete of different strengths in the channel layer 3 and the structural cushion layer 4, and ensures the pouring and forming of concrete on both sides of the steel mesh 33.

[0041] Preferably, the concrete strength of the channel layer 3 is greater than the concrete strength of the structural cushion layer 4 to ensure that the channel layer 3 has good bearing capacity and deformation resistance.

[0042] Specifically, the bottom end of the pipe pile 2 has a bottom cover 22, which is a steel plate, to facilitate pouring concrete into the pipe core of the pipe pile 2 during subsequent construction.

[0043] In a preferred embodiment, the channel layer 3 is cross-shaped and arranged on the foundation pit 1, and the four ends of the channel layer 3 are located at the edges of the foundation pit 1 in four directions, or multiple cross-shaped channel layers 3 are staggered on the foundation pit 1 as logistics channels.

[0044] In another preferred embodiment, at least two or more linear channel layers 3 are arranged in parallel on the foundation pit 1 as logistics channels, and the ends of the channel layers 3 are located at the edges of the foundation pit 1 in two opposite directions.

[0045] The construction process of the permanent and temporary combined logistics channel in the super-large foundation pit of the present invention is described below.

[0046] Pipe piles 2 are driven at the positions to be constructed of pipe piles 2, excavation is carried out at the positions to be constructed of foundation pit 1 and the excavation is carried out to the elevation position of the structural cushion layer 4, the area of ​​the channel layer 3 is marked by measuring and laying out, a temporary baffle is set on the top of the pipe pile 2 corresponding to the area of ​​the channel layer 3, and the channel layer 3 and the structural cushion layer 4 are constructed at the same time, the top surface of the channel layer 3 is flush with the top surface of the temporary baffle, and the height of the channel layer 3 is greater than the height of the structural cushion layer 4. The upper steel bar layer 31 and the lower steel bar layer 32 are tied and fixed in the area of ​​the channel layer 3. A longitudinal steel mesh 33 is vertically set at the intersection of the channel layer 3 and the structural cushion layer 4. At the same time, concrete is poured in the area of ​​the channel layer 3 and the area of ​​the structural cushion layer 4, the concrete of the channel layer 3 is poured until it is flush with the top surface of the temporary baffle, and the concrete height of the structural cushion layer 4 is lower than the top surface of the pipe pile 2. After the concrete of the channel layer 3 is hardened, the temporary baffle is taken out, and the cover plate 21 is set on the top of the corresponding pipe pile 2.

[0047] The present invention also provides a construction method for a permanent and temporary logistics channel in a super-large foundation pit, which is arranged in the foundation pit and comprises the following steps:

[0048] See also Figure 1 , drive pipe pile 2 at the position where pipe pile 2 is to be constructed.

[0049] See also Figure 1 , excavation is carried out at the location to be constructed of the foundation pit 1 and excavated to the elevation position of the structural cushion layer 4.

[0050] See also Figure 1 , the area of ​​channel layer 3 is marked by measuring and laying out.

[0051] The temporary baffle is covered on the top of the pipe pile 2 corresponding to the channel layer 3. The function of the temporary baffle is to prevent the concrete from flowing into the pipe core in the pipe pile 2 when pouring concrete in the channel layer 3.

[0052] See also Figure 2 and Figure 3 , the channel layer 3 and the structural cushion layer 4 are constructed at the same time, the top surface of the channel layer 3 is flush with the top surface of the temporary baffle, and the height of the channel layer 3 is greater than the height of the structural cushion layer 4.

[0053] After the concrete of the channel layer 3 is hardened, the temporary baffle is taken out, and the cover plate 21 is placed on the top of the corresponding pipe pile 2, and the channel layer 3 is used as a logistics channel.

[0054] Furthermore, the simultaneous construction of the channel layer 3 and the structural cushion layer 4 includes the following steps:

[0055] An upper reinforcement layer 31 and a lower reinforcement layer 32 are tied and fixed in the area of ​​the channel layer 3 .

[0056] A longitudinal steel mesh 33 is vertically arranged at the intersection of the channel layer 3 and the structural cushion layer 4 .

[0057] See also Figure 2 and Figure 3 At the same time, concrete is poured in the area of ​​the channel layer 3 and the area of ​​the structural cushion layer 4. The concrete of the channel layer 3 is poured until it is flush with the top surface of the temporary baffle, and the concrete height of the structural cushion layer 4 is lower than the top surface of the pipe pile 2.

[0058] See also Figure 4 and Figure 5 After the logistics channel is used, the foundation floor layer 5 is constructed on the logistics channel and the structural cushion layer 4. The specific steps are as follows:

[0059] Install the formwork for the foundation slab layer 5.

[0060] The cover plate 21 is removed. The cover plate 21 is removed here to facilitate the construction of the pipe pile 2. After the cover plate 21 is removed, concrete will be poured at the original position of the cover plate 21 to form a part of the foundation slab layer 5, thereby increasing the connection strength between the foundation slab layer 5 and the channel layer 3.

[0061] The main reinforcement 23 is tied and fixed in the pipe core of the pipe pile 2 and concrete is poured into the pipe core. The end of the main reinforcement 23 is embedded in the foundation bottom plate layer 5. The end of the main reinforcement 23 near the inner wall of the pipe core is bent outward and anchored obliquely in the foundation bottom plate layer 5. The end of the main reinforcement 23 located in the middle of the pipe core is vertically anchored in the foundation bottom plate layer 5. The anchoring of the main reinforcement 23 in the foundation bottom plate layer 5 enhances the connection strength between the pipe pile 2 and the foundation bottom plate layer 5, thereby enhancing the stability of the overall structure.

[0062] The second steel mesh layer 52 is tied and fixed on the channel layer 3, the third steel mesh layer 53 is tied and fixed on the pipe piles 2 in the structural cushion layer 4 area, and the first steel mesh layer 51 is tied and fixed on the upper part of the foundation slab layer 5 area to be constructed. The first steel mesh layer 51, the second steel mesh layer 52 and the third steel mesh layer 53 enhance the structural strength of the foundation slab layer 5.

[0063] Concrete is poured on the structural cushion layer 4 and the channel layer 3. The portion of the channel layer 3 that is higher than the structural cushion layer 4 and the portion of the pipe piles 2 that protrude from the structural cushion layer 4 in the area of ​​the structural cushion layer 4 are buried in the foundation slab layer 5, thereby increasing the connection strength between the foundation slab layer 5, the pipe piles 2, the channel layer 3 and the structural cushion layer 4, and enhancing the integrity and stability of the structure.

[0064] By adopting the above technical solution, the present invention has the following beneficial effects:

[0065] The present invention combines the pipe piles with the channel layer, so that the channel layer has good structural strength and can serve as a part of the main structure in the foundation pit; and the top ends of the pipe piles corresponding to the channel layer area are detachably covered with a cover plate, the top surface of the cover plate is flush with the top surface of the channel layer, so that the cover plate can be used as a transportation road surface. When it is necessary to construct the foundation floor layer in the foundation pit, it is only necessary to remove the cover plate, and further construct the foundation floor layer on the basis of the channel layer, thereby avoiding the heavy construction of breaking and cleaning the channel layer, speeding up the construction progress, and saving construction costs.

[0066] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0067] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A permanent and temporary logistics channel in a super-large foundation pit, arranged in the foundation pit, characterized in that: The logistics channel includes: A plurality of pipe piles buried below the bottom surface of the foundation pit and with top portions protruding above the bottom surface of the foundation pit; a channel layer disposed above the bottom surface of the foundation pit, through which the top ends of the pipe piles corresponding to the channel layer area are buried and the top surfaces of the pipe piles are exposed, and the height of the channel layer is greater than the height of the pipe piles above the bottom surface of the foundation pit; and A cover plate detachably covered on the top of the pipe pile corresponding to the channel layer area, wherein the top surface of the cover plate is flush with the top surface of the channel layer; An upper steel reinforcement layer located at the upper part of the channel layer and a lower steel reinforcement layer located at the lower part of the channel layer are transversely arranged in the channel layer; A structural cushion layer is arranged on the bottom surface of the foundation pit except for the position of the channel layer; The structural cushion layer is fixedly connected to the channel layer; The height of the channel layer is greater than the height of the structural cushion layer.

2. The permanent and temporary logistics channel in the super-large foundation pit according to claim 1 is characterized in that: A longitudinal steel mesh is vertically arranged at the intersection of the channel layer and the structural cushion layer.

3. The permanent and temporary logistics channel in the super-large foundation pit according to claim 1 is characterized in that: The concrete strength of the channel layer is greater than the concrete strength of the structural cushion layer.

4. A construction method for a permanent and temporary logistics channel in a super-large foundation pit as claimed in claim 1, which is arranged in a foundation pit and is characterized in that: The construction method comprises the following steps: Driving the pipe piles at the positions where the pipe piles are to be constructed; Excavating the earth at the location to be constructed of the foundation pit and digging to the elevation of the structural cushion layer; Mark out the area of ​​the channel layer by surveying and laying out lines; Installing a temporary baffle cover on the top of the pipe pile corresponding to the channel layer area; The channel layer and the structural cushion layer are constructed simultaneously, the top surface of the channel layer is flush with the top surface of the temporary baffle, and the height of the channel layer is greater than the height of the structural cushion layer; as well as After the concrete of the channel layer is hardened, the temporary baffle is taken out, and a cover plate is placed on the top of the corresponding pipe pile, so that the channel layer is used as a logistics channel.

5. The construction method of a permanent and temporary logistics channel in a super-large foundation pit according to claim 4 is characterized in that: The simultaneous construction of the channel layer and the structural cushion layer includes the following steps: Binding and fixing the upper steel bar layer and the lower steel bar layer in the area of ​​the channel layer; vertically arranging a longitudinal steel mesh at the intersection of the channel layer and the structural cushion layer; and At the same time, concrete is poured in the area of ​​the channel layer and the area of ​​the structural cushion layer. The concrete of the channel layer is poured until it is flush with the top surface of the temporary baffle, and the concrete height of the structural cushion layer is lower than the top surface of the pipe pile.

6. The construction method of a permanent and temporary logistics channel in a super-large foundation pit according to claim 4 is characterized in that: After the logistics channel is used, a foundation bottom plate layer is constructed on the logistics channel and the structural cushion layer.

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