A temporary broken-line steel frame support system and construction method for underground

Abstract

The present invention discloses a temporary folding steel frame support system and construction method for underground, which relates to the field of mechanical construction technology, including a foundation pit underground continuous wall, a bottom plate is arranged at the bottom of the foundation pit underground continuous wall, a floor plate is arranged above the bottom plate, a permanent structural column is arranged between the floor plates, a plurality of supporting points are arranged on the bottom surface of the floor plate of the lowest layer along the center line direction, and arched temporary support components are arranged on both sides of the supporting points between the floor plate and the bottom plate, and the arched temporary support components are connected to the floor plate only at the supporting points. In view of the problem of high construction cost in the prior art, the present invention effectively reduces the construction cost by reducing the repeated configuration of steel bars and the turnover use of full-house scaffolding.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical construction, and more specifically, to a temporary underground broken-line steel frame support system and a construction method. Background Art

[0002] The underground bottom floor of the station also serves as the starting assembly passage for the large circular shield machine, and a column-free space is required during the construction phase. Under normal circumstances, a temporary vertical support system such as temporary steel columns and steel beams is used to meet the force requirements under temporary column-free working conditions. The main shortcomings are as follows:

[0003] 1. Under the temporary working condition without columns, the stress state of the temporary structure is inconsistent with that of the permanent structure. The structural reinforcement must take into account both the temporary working condition and the permanent working condition, resulting in increased reinforcement. At the same time, pile foundations must be added to transfer vertical concentrated loads. These measures result in increased costs;

[0004] 2. In order to meet temporary working conditions, the full-height scaffolding of the basement structure needs to be erected layer by layer from bottom to top according to the force requirements. After the top plate is completed, it is dismantled from top to bottom and cannot be turned around. Therefore, a large number of full-height scaffolding is required for construction. Summary of the invention

[0005] In view of the problem of high construction cost in the prior art, the purpose of the present invention is to provide a temporary underground folding steel frame support system and construction method, so that the stress of the temporary structure system is consistent with the stress of the permanent structure system, reducing repeated reinforcement and lowering construction costs.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A temporary underground folding steel frame support system comprises an underground continuous wall of a foundation pit, a bottom plate is arranged at the bottom of the underground continuous wall of the foundation pit, a floor plate is arranged above the bottom plate, permanent structural columns are arranged between the floor plates, a plurality of supporting points are arranged on the bottom surface of the floor plate of the lowest layer along the center line direction, arched temporary supporting components are arranged on both sides of the supporting points between the floor plate and the bottom plate, and the arched temporary supporting components are connected to the floor plate only at the supporting points.

[0008] Through the above technical scheme, since the arched temporary support assembly is connected to the floor slab only at the supporting point to support the floor slab, the stress state of the temporary structure of the support system is consistent with the stress state of the permanent structure before and after the removal of the arched temporary support assembly, thereby reducing the repeated configuration of steel bars and effectively reducing the construction cost; and after the single-layer floor slab is supported by the arched temporary support assembly and the construction is completed, the full-height scaffolding used for the construction of the single-layer floor slab can be dismantled and used to build floors upwards, thereby realizing the turnover use of the full-height scaffolding and reducing construction costs.

[0009] Furthermore, the arched temporary support assembly includes a temporary inclined support rod whose two ends are respectively connected to the support point and the inner wall of the underground continuous wall of the foundation pit;

[0010] Among them, one end of the temporary inclined support rod close to the support point is the upper end, and the other end is the lower end.

[0011] Through the above technical solution, two temporary inclined support rods are used to support the supporting points of the floor slab, forming a triangular stable supporting structure to ensure sufficient supporting strength for the supporting points.

[0012] Furthermore, an embedded part is pre-embedded in the inner wall of the underground continuous wall of the foundation pit, and the embedded part is fixed to the lower end of the temporary inclined support rod.

[0013] Through the above technical solution, the connection strength between the lower end of the temporary inclined support rod and the inner wall of the underground continuous wall of the foundation pit is improved.

[0014] Furthermore, a pull rod is connected between the lower ends of the two temporary inclined support rods.

[0015] Through the above technical solution, the pull rod is used to balance the horizontal thrust of the lower end of the temporary tilt support rod.

[0016] Furthermore, the temporary inclined support rod is in a broken line shape, a reinforcing rod is fixed at the inflection point of the temporary inclined support rod, and one end of the reinforcing rod away from the temporary inclined support rod is connected to the inner wall of the underground continuous wall of the foundation pit.

[0017] Through the above technical solution, the reinforcement rods, temporary inclined support rods and the side walls of the underground continuous wall of the foundation pit form multiple triangular stable structures, further improving the stability of the support system.

[0018] Furthermore, an inner lining wall is cast inside the underground continuous wall of the foundation pit, both sides of the floor slab are integrally arranged with the inner lining wall, and embedded objects are pre-embedded in the inner wall of the inner lining wall, and the embedded objects are connected to the reinforcing rods.

[0019] Through the above technical solution, the connection strength between the reinforcement rod and the inner wall of the underground continuous wall of the foundation pit is improved.

[0020] Furthermore, the bottom surface of the floor slab is provided with a reserved connector at the supporting point to facilitate the subsequent connection of the column.

[0021] Through the above technical solution, the reserved connector is convenient for the subsequent pouring of columns and floor slabs to connect and support.

[0022] Furthermore, a connecting beam is provided at the supporting point on the bottom surface of the floor slab to facilitate connection with the arched temporary supporting assembly, and the reserved connector is provided in one end of the connecting beam close to the bottom plate.

[0023] Through the above technical solution, the connecting beam facilitates the connection and support of the arched temporary support assembly at the support point.

[0024] Furthermore, a plurality of the support points are arranged along the center line direction of the floor slab.

[0025] Through the above technical solution, it is convenient to distribute the weight of the floor slab to each pair of arched temporary support components, thereby ensuring the stability of the floor slab support.

[0026] A construction method for an underground temporary broken-line steel frame support system comprises the following steps:

[0027] S1, construction base plate;

[0028] S2, installing the arch temporary support assembly to form an arch support structure, and installing the joint at the end of the tie rod;

[0029] S3, construct the lining wall at the bottom layer and install the out-of-plane supports, tie rods and reinforcing rods of the arch temporary support assembly;

[0030] S4, erecting a full-height scaffolding, and constructing a floor slab at the arch top of the arch structure; after the floor slab construction is completed, dismantling the corresponding horizontal support at the floor slab, dismantling the full-height scaffolding, and using the full-height scaffolding in rotation, sequentially constructing multiple floor slabs and the inner lining walls of the corresponding floors upwards;

[0031] S5, dismantle the full-hall scaffolding and the corresponding original concrete supporting structure from top to bottom;

[0032] S6: After the shield is hoisted out, the columns are cast and the temporary arch support components are removed after the strength reaches the design requirements.

[0033] Through the above technical scheme, the stress state of the temporary structure under temporary column-free working conditions is consistent with the stress state of the permanent structure, which reduces the use of reinforcement and reduces construction costs. After the construction of the floor slab is completed, the full-height scaffolding can be disassembled and used to construct multi-story floor slabs upwards, realizing the turnover use of the full-height scaffolding and reducing construction costs.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) Before and after the removal of the temporary arch support assembly, the stress state of the temporary structure of the support system is consistent with that of the permanent structure, thereby reducing the repeated configuration of steel bars and effectively reducing the cost;

[0036] (2) After the single-layer floor is supported by the arched temporary support assembly and the construction is completed, the full-height scaffolding used for the single-layer floor construction can be dismantled and used to build the upper floors, thereby realizing the turnover of the full-height scaffolding and reducing the construction cost;

[0037] (3) Furthermore, multiple triangular shaped stable structures are formed by reinforcing rods, temporary inclined support rods and the side walls of the underground continuous wall of the foundation pit, thereby further improving the stability of the support system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the supporting structure of the prior art;

[0039] Figure 2 It is a schematic diagram of the structure of the present invention;

[0040] Figure 3 It is a structural schematic diagram of the supporting point in the present invention.

[0041] Figure numerals: 1. Underground continuous wall of foundation pit; 2. Bottom plate; 3. Floor slab; 4. Support point; 5. Temporary inclined support rod; 6. Embedded parts; 7. Pull rod; 8. Reinforcement rod; 9. Lining wall; 10. Embedded objects; 11. Reserved connector; 12. Connecting beam. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0043] A temporary steel frame support system for underground Figure 2 and Figure 3 As shown, it includes a foundation pit underground continuous wall 1 formed by an underground continuous wall, the bottom of the foundation pit underground continuous wall 1 is formed by pouring concrete to form a bottom plate 2, a floor slab 3 is arranged above the bottom plate 2, and permanent structural columns are arranged between the floor slabs 3. The bottom surface of the floor slab 3 of the lowest layer is provided with multiple support points 4 along the center line of its length direction, and arched temporary support components are arranged on both sides of the support points 4 between the floor slab 3 and the bottom plate 2 to form an arch frame structure, and the arched temporary support components are connected to the floor slab 3 only at the support points 4.

[0044] Since the arched temporary support assembly is connected to the floor 3 only at the support point 4 to support the floor 3, the stress state of the temporary structure of the support system is consistent with the stress state of the permanent structure before and after the removal of the arched temporary support assembly, thereby reducing the repeated configuration of steel bars and effectively reducing the construction cost; and after the construction of the single-layer floor 3 is completed, the full-floor scaffolding can be used to build floors upwards, thereby realizing the turnover of the full-floor scaffolding and reducing construction costs.

[0045] The arched temporary support assembly includes a temporary inclined support rod 5 whose two ends are respectively connected to the support point 4 and the inner wall of the underground continuous wall 1 of the foundation pit, wherein the end of the temporary inclined support rod 5 close to the support point 4 is the upper end, and the other end is the lower end. The two temporary inclined support rods 5 are used to support the support point 4 of the floor 3 to form a triangular stable support structure to ensure sufficient support strength for the support point 4. The inner wall of the underground continuous wall 1 of the foundation pit is pre-embedded with an embedded part 6, which is located near the bottom plate 2. The embedded part 6 is fixed to the lower end of the temporary inclined support rod 5 to improve the connection strength between the lower end of the temporary inclined support rod 5 and the underground continuous wall 1 of the foundation pit. A pull rod 7 is connected between the lower ends of the two temporary inclined support rods 5 to balance the horizontal thrust of the lower end of the temporary inclined support rod 5.

[0046] The temporary tilting support rod 5 is in a broken line shape, and a reinforcing rod 8 is fixed at the breaking point of the temporary tilting support rod 5. The reinforcing rod 8 and the temporary tilting support rod 5 are both made of H-shaped steel. An inner lining wall 9 is cast between the bottom plate 2 and the floor 3 on the inner side of the underground continuous wall 1 of the foundation pit. Both sides of the floor 3 are integrally arranged with the inner lining wall 9. The inner wall of the inner lining wall 9 is pre-embedded with embedded objects 10, and the embedded objects 10 are connected to the reinforcing rod 8. The reinforcing rod 8, the temporary tilting support rod 5 and the side wall of the underground continuous wall 1 of the foundation pit form a plurality of triangular stable structures, which further improves the stability of the support system of the present invention.

[0047] In addition, in order to ensure the stability of the arched temporary support assembly outside the plane, a longitudinal horizontal support system is also arranged on both sides of the arched temporary support assembly, which is formed by angle steel or inclined steel bars to further improve the support stability of the arched temporary support assembly.

[0048] A connecting beam 12 is provided at the supporting point 4 on the bottom surface of the floor 3 for connecting the arched temporary supporting assembly. The connecting beam 12 is made of cast-in-place concrete. A reserved connector 11 is provided at one end of the connecting beam 12 close to the bottom plate 2 for subsequent connection with the column. The reserved connector 11 is an existing device.

[0049] A construction method for an underground temporary broken line steel frame support system, such as Figure 2 and Figure 3 As shown, the following steps are included:

[0050] S1, construction of concrete base plate 2;

[0051] S2, installing the arch temporary support assembly to form an arch support structure, and installing a joint at the end of the tie rod 7;

[0052] S3, construct the lining wall 9 at the bottom layer, and install the out-of-plane support, tie rod 7 and reinforcing rod 8 of the arch temporary support assembly;

[0053] S4, erecting a full-floor scaffolding, and constructing a floor 3 at the arch top of the arch structure; after the construction of the floor 3 is completed, dismantling the corresponding horizontal support of the floor 3, dismantling the full-floor scaffolding, and using the full-floor scaffolding in rotation, sequentially constructing multiple floor slabs 3 and the inner lining walls 9 of the corresponding floors upward;

[0054] S5, dismantle the full-hall scaffolding and the corresponding original concrete supporting structure from top to bottom;

[0055] S6: After the shield is hoisted out, the columns are cast and the temporary arch support components are removed after the strength reaches the design requirements.

[0056] In summary:

[0057] When the present invention is used, before and after the arch temporary support assembly is dismantled, the stress state of the temporary structure of the support system is consistent with the stress state of the permanent structure, thereby reducing the repeated configuration of steel bars and effectively reducing the construction cost; and after the construction of the single-layer floor 3 is completed, the full-floor scaffolding can be used to build floors upwards, thereby realizing the turnover use of the full-floor scaffolding and reducing construction costs.

[0058] The arch foot is connected to the underground continuous wall through embedded parts, transferring the temporary vertical load to the ground wall without the need for additional pile foundations. A steel tie rod 7 is used between the two arch feet to balance the horizontal thrust of the temporary folding steel arch frame. The temporary folding steel frame support system effectively solves the problem of inconsistency between the stress state of the temporary structure and the stress state of the permanent structure in the existing solution, reduces the repeated configuration of steel bars, and effectively reduces the cost.

[0059] At the same time, the intersection node between the broken steel arch frame and the concrete beam was designed using the design concept of rigid steel structure nodes, which not only meets the force requirements of the temporary structure, but also meets the column-free space requirements during the shield construction phase.

[0060] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A temporary underground broken line steel frame support system, comprising an underground continuous wall (1) for a foundation pit, a bottom plate (2) being arranged at the bottom of the underground continuous wall (1), and a floor plate (3) being arranged above the bottom plate (2), characterized in that: Permanent structural columns are arranged between the floor slabs (3); a plurality of supporting points (4) are arranged on the bottom surface of the floor slab (3) of the lowest layer along the center line thereof; all supporting points (4) are arranged in a row; arched temporary supporting components are arranged on both sides of the supporting points (4) between the floor slab (3) and the bottom plate (2); all arched temporary supporting components are divided into two rows; all supporting points (4) are located between the two rows of arched temporary supporting components; and the two arched temporary supporting components corresponding to each supporting point (4) are connected to the floor slab (3) only at the supporting point (4); After the shield is hoisted out, cast columns are constructed at the supporting points; The arched temporary support assembly comprises temporary inclined support rods (5) whose two ends are respectively connected to the support point (4) and the connection between the underground continuous wall (1) and the bottom plate (2) of the foundation pit; Wherein, one end of the temporary tilting support rod (5) close to the support point (4) is the upper end, and the other end is the lower end; The temporary inclined support rod (5) is in the shape of a broken line, a reinforcing rod (8) is fixed at the breaking point of the temporary inclined support rod (5), and one end of the reinforcing rod (8) away from the temporary inclined support rod (5) is connected to the inner wall of the underground continuous wall (1) of the foundation pit; The reinforcing rods (8), the temporary inclined support rods (5) and the side walls of the underground continuous wall (1) of the foundation pit form a plurality of triangular-shaped stable structures.

2. The temporary underground folding steel frame support system according to claim 1, characterized in that: The underground continuous wall (1) of the foundation pit is pre-embedded with an embedded part (6), and the embedded part (6) is fixed to the lower end of the temporary inclined support rod (5).

3. A temporary underground folding steel frame support system according to claim 1 or 2, characterized in that: A pull rod (7) is connected between the lower ends of the two temporary tilting support rods (5).

4. The temporary underground folding steel frame support system according to claim 1, characterized in that: An inner lining wall (9) is cast inside the underground continuous wall (1) of the foundation pit, and both sides of the floor slab (3) are integrally arranged with the inner lining wall (9). An embedded object (10) is pre-embedded in the inner wall of the inner lining wall (9), and the embedded object (10) is connected to the reinforcing rod (8).

5. The temporary underground folding steel frame support system according to claim 1, characterized in that: The bottom surface of the floor slab (3) is provided with a reserved connector (11) at the supporting point (4) for facilitating the subsequent connection with a column.

6. The temporary underground folding steel frame support system according to claim 5, characterized in that: The bottom surface of the floor slab (3) is provided with a connecting beam (12) at the supporting point (4) for facilitating connection with the arched temporary supporting assembly, and the reserved connector (11) is arranged in one end of the connecting beam (12) close to the bottom plate (2).

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