A large-span, column-free subway station slab wall double-folded corner space structure

Abstract

This utility model provides a large-span, column-free subway station slab wall double-folded axle-angle spatial structure, including a large-span top slab, vertical side walls, and double-folded axle-angles. The large-span top slab is a reinforced concrete component with a transverse span ≥20m. The vertical side walls are connected to the large-span top slab via double-folded axle-angles. Each double-folded axle-angle is a double-fold structure consisting of two axle-angles, with the included horizontal angle of each axle-angle being an acute angle. This large-span, column-free subway station slab wall double-folded axle-angle spatial structure has advantages such as better stress distribution, better structural bearing capacity, and the ability to form a standard construction structure.

Description

Technical Field

[0001] This utility model relates to the field of underground building structure engineering technology, specifically to a large-span, column-free subway station slab wall double-folded corner space structure. Background Technology

[0002] After the construction of the subway wall is completed, the various connecting areas of the wall need to be treated. Since the subway station is an underground building, the requirements for stress in all directions are different from those of the above-ground building. Especially when constructing a large-span column-free structure, there are certain problems with the construction experience of above-ground buildings.

[0003] Specifically, the connection structure between the roof slab and side walls of existing subway stations has the following technical defects:

[0004] (1) Stress concentration is easily caused at right-angle nodes, which forces the structure to be thickened or reinforced, resulting in waste of building materials;

[0005] (2) The stress transmission path of a single folded haunch angle is singular, making it difficult to meet the load transfer requirements of a column-free large-span space of more than 20 meters;

[0006] (3) Traditional construction techniques have common quality problems such as difficulty in setting up formwork and inadequate concrete vibration, which affect the durability of the structure.

[0007] For the reasons mentioned above, it is necessary to optimize the structure of the large-span column-free subway station slab wall to improve its stress distribution and structural bearing capacity, so as to meet the spatial permeability advantage brought by the large-span structure. Utility Model Content

[0008] The purpose of this utility model is to address the shortcomings of existing technologies by providing a large-span, column-free subway station slab wall double-folded corner space structure with better stress distribution and structural bearing capacity, which can form a standard construction structure.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is: a large-span column-free subway station slab wall double-folded armpit corner space structure, including a large-span top slab, vertical side walls and double-folded armpit corners;

[0010] The large-span roof slab is a reinforced concrete component with a transverse span of ≥20m;

[0011] The upright sidewall is connected to the large-span roof slab via a double-folded corner joint;

[0012] The double-folded axillary angle is a double-folded structure consisting of two axillary angles, and the included horizontal angle of each axillary angle is an acute angle.

[0013] Preferably, the connection area between the double-folded corner, the upright sidewall, and the large-span roof slab is an integral structure made of cast-in-place concrete.

[0014] Preferably, the concrete structure corresponding to the double-folded armpit angle has a built-in radial reinforcing mesh.

[0015] Preferably, the surface of the double-folded armpit corner structure is covered with a fiber mesh fabric.

[0016] Preferably, the basis weight of the fiber mesh fabric is ≥300g / m². 2 .

[0017] Preferably, the concrete grade of the large-span roof slab is C40 concrete.

[0018] Preferably, the cross-sectional thickness of the large-span roof slab is between 500mm and 1200mm.

[0019] Preferably, in the double axillary angle, the axillary angle closer to the upright sidewall is the first axillary angle, and the horizontal included angle of the first axillary angle is between 30° and 60°.

[0020] Preferably, in the double-folded axilla angle, the axilla angle closer to the top plate of the large span is the second axilla angle, and the horizontal included angle of the second axilla angle is between 15° and 30°.

[0021] Preferably, the height of the double-folded armpit angle is between 1.5m and 2.5m, and the unfolded width is between 2m and 4m.

[0022] This utility model has substantial features and progress compared with the prior art. Specifically, this utility model adopts a double-fold armpit angle structure to innovatively disperse structural stress. Compared with the traditional single-fold structure, the local stress peak is significantly reduced, which significantly improves the structural reliability.

[0023] Supported by the double-folded armpit-shaped structure, a breakthrough was achieved in constructing a 20-30 meter column-free space, creating an open visual corridor and increasing the space efficiency index by 27%, perfectly meeting the functional and aesthetic requirements of modern rail transit hubs.

[0024] The above-mentioned structure is constructed by rebar installation and cast-in-place construction. Based on BIM technology, a standardized prefabrication system for formwork can be implemented, which can effectively shorten the construction period. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a large-span, column-free subway station slab wall double-folded corner space structure according to this utility model.

[0026] Figure 2 This is a cross-sectional view of the reinforcement details of a double-folded haunch angle spatial structure for a large-span, column-free subway station slab wall in this utility model.

[0027] In the diagram: 1. Large-span roof slab; 2. Vertical sidewalls; 3. Double-folded haunches; 4. Radial reinforcing mesh. Detailed Implementation

[0028] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0029] like Figure 1 and Figure 2 As shown, a large-span, column-free subway station slab wall double-folded axle corner spatial structure includes a large-span top slab 1, vertical side walls 2, and double-folded axle corners 3.

[0030] In this embodiment, the large-span top slab 1 is a C40 reinforced concrete component with a transverse span ≥20m and a cross-sectional thickness between 500-1200mm.

[0031] The upright sidewall 2 and the large-span roof slab 1 are connected by a double-folded haunch angle 3. In this embodiment, the upright sidewall 2 and the large-span roof slab 1 form a T-shaped connection, and the concrete strength grade is ≥C35.

[0032] The double-folded axilla 3 is a double-fold structure consisting of two axillas, each with an acute horizontal angle. Specifically, in this embodiment, the axilla closer to the vertical sidewall is the first axilla, illustrated as α, and its horizontal angle is between 30° and 60°. The axilla closer to the large-span roof slab is the second axilla, illustrated as β, and its horizontal angle is between 15° and 30°.

[0033] The height H of the double-folded armpit angle 3 is between 1.5m and 2.5m, and the unfolded width W is between 2m and 4m.

[0034] In terms of structural forming, the connection area of ​​the double-folded axle angle 3, the vertical side wall 2 and the large-span top plate 1 is a cast-in-place concrete integral structure. The concrete structure corresponding to the double-folded axle angle has a built-in radial reinforcement mesh 4, which uses Φ12@100-150 steel bars.

[0035] To prevent cracking, the surface of the double-folded armpit corner structure is covered with a fiber mesh fabric, the weight of which is ≥300g / m². 2 .

[0036] In practice, industrial tools are required. The key steps in constructing this structure are as follows:

[0037] (1) Parametric design: The optimal geometric parameters of the double-fold armpit angle (α=57°, β=15°, H=2.2m, W=3.9m) were determined based on ANSYS topology optimization.

[0038] (2) Intelligent prefabrication: The assembly steel mold system is processed by a five-axis CNC machine tool, and the underarm corner joint is equipped with a hydraulic angle adjustment device to adapt to the engineering tolerance of ±5°.

[0039] (3) Segmented casting construction:

[0040] ① Phase 1: Implement precise positioning and installation of side wall formwork, and complete the initial pouring of C50 self-compacting concrete in the underarm corner area;

[0041] ② Phase Two: Erect the top slab support system and carry out secondary pouring of the upper haunch corner area and the top slab structure to form an integral load-bearing unit.

[0042] (4) Three-dimensional quality monitoring: Phased array ultrasonic testing technology is used to establish a three-dimensional cloud map of concrete density in the axilla corner area, achieving a 99.2% compliance rate for solid quality.

[0043] In summary, this utility model addresses the structural-spatial collaborative design requirements of large-span subway stations by incorporating a double-folded haunch angle structure in the slab-wall joint area. The reinforcement scheme follows the stress flow guidance principle, employing a composite configuration of radial reinforcement groups and circumferential reinforcement, meeting the GB50010 standard for crack resistance level three control.

[0044] Finally, it should be noted that: the preferred embodiments of this patent have been described in detail above, but this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A double-folded corner space structure for a large-span, column-free subway station slab wall, characterized in that: This includes the large-span roof slab, vertical side walls, and double-folded haunches; The large-span roof slab is a reinforced concrete component with a transverse span of ≥20m; The upright sidewall is connected to the large-span roof slab via a double-folded corner joint; The double-folded axillary angle is a double-folded structure consisting of two axillary angles, and the included horizontal angle of each axillary angle is an acute angle.

2. The large-span, column-free subway station slab wall double-folded corner space structure according to claim 1, characterized in that: The connection area between the double-folded axle corner, the upright side wall, and the large-span roof slab is a cast-in-place concrete integral structure.

3. The large-span, column-free subway station slab wall double-folded corner space structure according to claim 2, characterized in that: The concrete structure corresponding to the double-folded armpit angle has an internal radial reinforcing mesh.

4. The large-span, column-free subway station slab wall double-folded corner space structure according to claim 2 or 3, characterized in that: The surface of the double-folded armpit corner structure is covered with fiber mesh fabric.

5. The large-span, column-free subway station slab wall double-folded corner space structure according to claim 4, characterized in that: The basis weight of the fiber mesh fabric is ≥300g / m². 2 .

6. The large-span, column-free subway station slab wall double-folded corner space structure according to claim 4, characterized in that: The concrete grade of the large-span roof slab is C40 concrete.

7. The large-span, column-free subway station slab wall double-folded corner space structure according to claim 4, characterized in that: The cross-sectional thickness of the large-span roof slab is between 500mm and 1200mm.

8. The large-span, column-free subway station slab wall double-folded corner space structure according to claim 4, characterized in that: In the double axillary angle, the axillary angle closer to the upright sidewall is the first axillary angle, and the horizontal included angle of the first axillary angle is between 30° and 60°.

9. The large-span, column-free subway station slab wall double-folded corner space structure according to claim 4, characterized in that: In the double-folded axilla angle, the axilla angle closer to the top plate of the large span is the second axilla angle, and the horizontal included angle of the second axilla angle is between 15° and 30°.

10. The large-span, column-free subway station slab wall double-folded corner space structure according to claim 4, characterized in that: The height of the double-folded armpit angle is between 1.5m and 2.5m, and the unfolded width is between 2m and 4m.

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