Precast concrete hollow column type inspection pit structure

Abstract

The utility model discloses a prefabricated concrete hollow stand column type inspection pit structure. The inspection pit comprises a concrete cushion layer, a foundation beam, a waterproof bottom plate, a zero layer plate, anchor bars, prefabricated hollow stand columns and a track which are sequentially arranged from bottom to top. The concrete cushion is arranged at the bottommost part of the inspection pit, the foundation beams are poured on the concrete cushion, and the waterproof bottom plate is arranged between the foundation beams; a rail is mounted at the top of the prefabricated hollow stand column; anchor bars are reserved at the bottoms of the prefabricated hollow stand columns and used for fixedly connecting the prefabricated hollow stand columns and the zero-layer plate and supported by the foundation beam. Compared with the prior art, the foundation beam structure is arranged, the top face of the foundation beam is the same as the adjacent site in elevation, use of construction machinery, binding of zero-layer plates and transporting and hoisting of prefabricated columns are facilitated, the construction image, environment and quality are improved, the working procedures of pre-burying steel sleeves in a prefabricated hollow stand column factory and screwing in anchoring steel bars on site are omitted, and the construction cost is reduced. And the construction period is shortened, the steel sleeve cost is saved, and more energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] The utility model belongs to the field of urban rail transportation, in particular to a prefabricated concrete hollow column type inspection pit structure. Background Art

[0002] The rapid development of urban rail transit has put forward higher requirements on the quality and construction period of vehicle depot construction. Inspection pits are places in vehicle depots for maintenance of subway vehicles. At present, there are two types of inspection pit columns: one is a cast-in-place concrete structure, which is poured in two times. The first pouring is to the bottom of the track embedded parts, and the second pouring is carried out after the hanging rail is leveled. It has many construction processes, great construction difficulty, long construction period, low precision, poor quality and high cost; the other is a precast concrete column, where a steel sleeve connector is set at the bottom of the precast column to connect it to the lower foundation steel bar, and the column bottom connecting steel bar is screwed into the precast column bottom steel sleeve on site, and the foundation is poured after the hanging rail is leveled; compared with traditional cast-in-place columns, precast concrete columns have fewer construction processes, high precision, good quality, low cost and short construction period. However, the inspection pit based on precast concrete columns currently has the following problems: First, it is necessary to screw the eight anchoring steel bars at the bottom of the column into the precast steel sleeve at the bottom of the column on site. This process is relatively cumbersome, and 18mm diameter steel bars are used, which have a long anchoring length, are difficult to construct, and have high sleeve and labor costs; second, after the foundation of the inspection pit is poured, it does not reach the same elevation as the overall construction site plane, and the width of the concave surface is 2m. This form restricts the use of construction machinery and the subsequent construction processes; third, because the side wall retaining wall of the inspection pit needs to be poured after the column is installed, groundwater infiltrates and surface water gathers in the groove of the inspection pit foundation, which is prone to water and slag accumulation, resulting in corrosion of the side wall retaining wall steel bars that were tied first, and a large workload for daily drainage and cleaning and maintenance, which seriously affects the construction image, environment, quality, progress and cost of the vehicle depot. Utility Model Content

[0003] The purpose of this application is to provide a prefabricated concrete hollow column inspection pit structure to achieve the goals of high assembly rate, fewer construction processes, convenient construction and low project cost.

[0004] The technical solution for achieving the purpose of the utility model is: a precast concrete hollow column inspection pit structure, characterized in that the inspection pit includes a concrete cushion layer, a foundation beam, a waterproof bottom plate, a zero-layer plate, anchor bars, precast hollow columns and tracks arranged in sequence from bottom to top; the concrete cushion layer is arranged at the bottom of the inspection pit, and the foundation beam is cast on it, and a waterproof bottom plate is arranged between the foundation beams; a track is installed on the top of the precast hollow column; anchor bars are left at the bottom of the precast hollow column, which is used to fix the precast hollow column and the zero-layer plate and supported by the foundation beam.

[0005] Compared with the prior art, the utility model has the following significant advantages:

[0006] (1) The precast concrete column disclosed in the utility model eliminates the steel sleeve at the bottom of the precast concrete column, thereby reducing the cost of the precast concrete column and shortening the construction period while ensuring the strength of the precast concrete column;

[0007] (2) A foundation beam structure is provided in the inspection pit structure of the utility model, and the top elevation of the foundation beam is flush with the adjacent site. During construction, the foundation beam is cast first, so that the construction site is leveled to facilitate mechanized construction, zero-layer slab binding, and prefabricated column transportation and hoisting, thereby improving the civilized construction image, construction environment and quality, accelerating the construction progress, and reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a structural schematic diagram of a prefabricated concrete hollow column type inspection pit of the utility model;

[0009] Figure 2 This is a structural schematic diagram of a prefabricated concrete hollow column of the utility model;

[0010] The names corresponding to the numbers in the figure are: 1-concrete cushion; 2-foundation beam; 3-waterproof bottom plate; 4-zero-layer plate; 5-anchor bar; 6-prefabricated hollow column; 7-top embedded sleeve; 8-fastener; 9-track; 10-column bottom rough surface; 11-steel skeleton. DETAILED DESCRIPTION

[0011] The present invention is further described below in conjunction with the accompanying drawings and specific implementation examples. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0012] like Figure 1 As shown, this embodiment provides a precast concrete hollow column type inspection pit structure, including a concrete cushion layer 1, a foundation beam 2, a waterproof bottom plate 3, a zero-layer plate 4, anchor bars 5, precast hollow columns 6, embedded sleeves 7, fasteners 8 and rails 9 arranged in sequence from bottom to top.

[0013] The concrete cushion layer 1 is set at the bottom of the inspection pit, and the foundation beam 2 is cast on it. A waterproof bottom plate 3 is set between the foundation beams 2; the top of the prefabricated hollow column 6 is provided with an embedded sleeve 7, and the track 9 and the prefabricated hollow column 6 are fixedly connected by the fastener 8 installed on the embedded sleeve 7. Anchor bars 5 are left at the bottom of the prefabricated hollow column 6, which are used to fix the prefabricated hollow column 6 and the zero-layer slab 4 and are supported by the foundation beam, eliminating the process of embedding steel sleeves in the factory of the prefabricated hollow column 6 and screwing in anchor steel bars on site, saving construction time, saving steel sleeve costs, and being more energy-saving and environmentally friendly;

[0014] like Figure 2As shown, the prefabricated hollow column 6 includes a solid section and a hollow section. Preferably, the height of the solid section is 250 mm; the height of the hollow section is designed according to the actual project. Preferably, the hollow ratio of the hollow section is 14.4%, which ensures structural strength while saving processing costs.

[0015] An embedded sleeve 7 is provided on the top of the solid section, which is used to fix the track 9 and the prefabricated hollow column 6 through the connecting fastener 8; the hollow section of the prefabricated hollow column 6 saves material and transportation costs; the factory standardized production of the prefabricated hollow column 6 has high efficiency, guaranteed quality and low component cost.

[0016] The steel bar skeleton 11 is arranged inside the prefabricated hollow column 6 to ensure the structural strength of the prefabricated hollow column 6. The main reinforcement is a threaded steel bar with a diameter of 14 mm.

[0017] The length of the anchor bar 5 reserved at the bottom of the prefabricated hollow column 6 is not less than the seismic anchor length l ae , 14mm diameter threaded steel bar seismic anchorage length l ae Compared with the anchorage length l of the main reinforcement using 18mm diameter threaded steel bars in the prior art ae Short, which is conducive to the anchor connection with the zero-layer board and convenient for on-site installation;

[0018] The rough surface 10 of the bottom of the prefabricated hollow column 6 has a concave-convex depth of not less than 6 mm, so that it is connected to the zero-layer plate 4 as a whole;

[0019] The prefabricated hollow column 6 is provided with R=35mm chamfers around its periphery to facilitate transportation and ensure the aesthetics of the column;

[0020] The upper top surface of the foundation beam 2 in the inspection pit (i.e., the first pouring surface) is at the same elevation as the adjacent site, which facilitates the use of construction machinery, the binding of zero-layer slabs, and the transportation and hoisting of prefabricated columns, achieves a waterproof effect, improves the construction image, environment, and quality, speeds up the construction progress, and reduces the construction cost;

[0021] The top rough surface of the foundation beam 2 has a concave-convex depth of not less than 4 mm, so that the zero-layer plate 4 is connected to it as a whole;

[0022] The construction process of a prefabricated concrete hollow column type inspection pit structure disclosed in the utility model is as follows:

[0023] (1) Concrete cushion layer 1 is poured.

[0024] (2) First pouring: First, pour the foundation beam 2 and waterproof bottom plate 3. The depth of the rough surface on the top of the foundation beam 2 is not less than 4 mm. After pouring, it is flush with the plane of the construction site. The width of the concave surface in the middle of the foundation beam is only 1 m. After the temporary laying of the steel plate, the site is leveled, which facilitates the implementation of subsequent processes and the use of mechanical equipment.

[0025] (3) Hoist the prefabricated columns, accurately position them, and tie the steel bars of the zero-layer slab 4;

[0026] (4) Second pouring: After the positioning and elevation of the precast columns are verified according to the track requirements, the zero-layer slab 4 is poured.

[0027] (5) Installing the track 9: The track 9 is installed on the top of the prefabricated hollow column 6 through the embedded sleeve 7 and the fastener 8, thereby achieving a fixed connection between the prefabricated hollow column 6 and the track 9.

[0028] The present invention is not limited to the above-mentioned specific implementation modes. For ordinary technicians in this field, various changes made based on the above-mentioned conception without creative work all fall within the protection scope of the present invention.

Claims

1. A prefabricated concrete hollow column inspection pit structure, characterized in that: The inspection pit comprises a concrete cushion layer (1), a foundation beam (2), a waterproof bottom plate (3), a zero-layer plate (4), anchor bars (5), a prefabricated hollow column (6) and a track (9) which are arranged in sequence from bottom to top. The concrete cushion layer (1) is arranged at the bottom of the inspection pit, and the foundation beam (2) is cast on it. The waterproof bottom plate (3) is arranged between the foundation beams (2). The top of the prefabricated hollow column (6) is equipped with a track (9). The bottom of the prefabricated hollow column (6) is provided with anchor bars (5) for fixing the prefabricated hollow column (6) and the zero-layer plate (4) to be supported by the foundation beam (2).

2. The precast concrete hollow column inspection pit structure according to claim 1 is characterized in that: The inspection pit further comprises an embedded sleeve (7) and a fastener (8); the embedded sleeve (7) is arranged on the top of the prefabricated hollow column (6), and the track (9) and the prefabricated hollow column (6) are fixedly connected by the fastener (8) installed on the embedded sleeve (7).

3. The precast concrete hollow column inspection pit structure according to claim 1 is characterized in that: The top surface of the foundation beam (2) is at the same elevation as the adjacent site.

4. The precast concrete hollow column inspection pit structure according to claim 1 is characterized in that: The length of the anchor bar (5) reserved at the bottom of the prefabricated hollow column (6) is not less than the seismic anchor length l ae .

5. The precast concrete hollow column inspection pit structure according to claim 1 is characterized in that: The prefabricated hollow column (6) comprises a solid section and a hollow section.

6. The precast concrete hollow column inspection pit structure according to claim 1 is characterized in that: The top rough surface of the foundation beam (2) has a concave-convex depth of not less than 4 mm.

7. The precast concrete hollow column inspection pit structure according to claim 1 is characterized in that: The rough surface (10) at the bottom of the prefabricated hollow column (6) has a concave-convex depth of not less than 6 mm, so that it is connected with the zero-layer board (4) to form a whole.

8. The precast concrete hollow column inspection pit structure according to claim 1 is characterized in that: The steel reinforcement frame (11) is arranged to penetrate inside the prefabricated hollow column (6) and is used to ensure the structural strength of the prefabricated hollow column (6).

9. The precast concrete hollow column inspection pit structure according to claim 8 is characterized in that: The main reinforcement of the prefabricated hollow column (6) is threaded steel bar with a diameter of 14 mm.

10. The precast concrete hollow column inspection pit structure according to claim 5, characterized in that: The hollow ratio of the hollow section is 14.4%.

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