A passage floor structure applied to a deep foundation pit

Abstract

The utility model relates to a passageway bottom plate structure applied to deep foundation pit, including body, this body is flat plate, set up in deep foundation pit, and the left side and right side are connected with the inner wall of the bored pile support and diaphragm wall for being arranged in the both sides of deep foundation pit respectively, the left side of this body is straight edge, and the right side is Z down step shape, the outer end surface of the step is connected with the inner wall of diaphragm wall, and the upper vertical surface is connected with the existing building outside diaphragm wall through post-pouring belt. The utility model carries out passageway bottom plate construction first, and makes the bottom plate to be tightly pressed on diaphragm wall. Then, the diaphragm wall of passageway bottom plate upper portion is removed, and the bottom plate is connected with the existing structure through post-pouring belt. Thus, not only the structural strength of passageway bottom plate is guaranteed, but also the overturning of diaphragm wall can be effectively avoided, and the smooth construction is ensured.

Description

Technical Field

[0001] This utility model relates to a building structure, and more particularly to a channel structure suitable for construction in deep foundation pits, specifically a channel bottom plate structure applied in deep foundation pits. Background Technology

[0002] With the research and development of urban underground engineering, deep foundation pits are becoming increasingly common in engineering construction. When the foundation pit is deep, the geological conditions are poor, and the surrounding environment is complex, vertical retaining components such as cast-in-place piles and diaphragm walls are usually installed, and horizontal internal supports are used on the vertical retaining structure to resist the external earth pressure and prevent the vertical retaining structure from overturning into the foundation pit.

[0003] Some deep foundation pits require the construction of passageways, and the bottom slab of these passageways needs to be connected to the existing buildings outside the diaphragm wall. The current conventional construction method is to first remove the diaphragm wall above the bottom slab according to the design elevation, and then construct the connection between the bottom slab and the existing building. However, once the upper part of the diaphragm wall is removed, it will severely affect the load-bearing structure of the entire diaphragm wall, easily causing it to overturn, thus posing a significant safety hazard.

[0004] Therefore, improvements are urgently needed to eliminate safety hazards and ensure construction safety. Utility Model Content

[0005] The purpose of this invention is to address the problems encountered during the construction of passages in deep foundation pits by providing a passage bottom slab structure applicable to deep foundation pits. This structure can effectively prevent diaphragm wall overturning accidents that may occur during the construction of the bottom slab and eliminate safety hazards.

[0006] The technical solution of this utility model is: A channel bottom slab structure for use in deep foundation pits includes a body, which is flat and set in the deep foundation pit. Its left and right sides are connected to the inner walls of the cast-in-place pile support and the diaphragm wall located on both sides of the deep foundation pit, respectively. The left side of the body is a straight side, and its right side is a Z-shaped downward step. The outer end face of the step is connected to the inner wall of the diaphragm wall, and its upper facade is connected to the existing building outside the diaphragm wall through a post-cast strip.

[0007] Furthermore, the upper surface of the step is a vertical surface, and its lower surface is an inclined surface.

[0008] Furthermore, the top surface of the post-cast strip is flush with the top surface of the body.

[0009] Furthermore, the main body is provided with a first reserved steel bar; the outer end of the first reserved steel bar extends beyond the upper facade of the step and is provided with a first threaded joint; the existing building is provided with a second reserved steel bar; the end of the second reserved steel bar near the diaphragm wall is provided with a second threaded joint; it also includes a connecting steel bar, the two ends of which are respectively connected to the first threaded joint and the second threaded joint, and placed in the post-cast strip.

[0010] Furthermore, it also includes a water-stop steel plate, which is disposed at the connection between the body and the post-cast strip, with its length being equivalent to the width of the body and placed within the body and the post-cast strip.

[0011] The beneficial effects of this utility model are: This utility model features a reasonable design, simple structure, and convenient use. It allows for the initial construction of the tunnel floor slab, which is then firmly anchored against the diaphragm wall. Next, the diaphragm wall above the tunnel floor slab is removed, and the floor slab is connected to the existing structure via a post-cast strip. This not only ensures the structural strength of the tunnel floor slab but also effectively prevents the diaphragm wall from overturning, ensuring smooth construction. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the internal structure of the post-cast strip of this utility model.

[0014] Among them, 1-cast pile support; 2-body; 3-demolished part; 4-post-cast strip; 5-diaphragm wall; 6-existing building; 7-waterstop steel plate; 8-first embedded steel bar; 9-first threaded joint; 10-connecting steel bar; 11-second threaded joint; 12-second embedded steel bar. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] like Figure 1 and 2 As shown.

[0017] A channel bottom plate structure for use in deep foundation pits includes a body.

[0018] The main body 2 is flat and is installed in the deep foundation pit. Its left and right sides are connected to the inner walls of the cast-in-place pile support 1 and the diaphragm wall 5 located on both sides of the deep foundation pit, respectively. The left side of the main body 2 is a straight side, and its right side is a Z-shaped downward step. The outer end face of the step is connected to the inner wall of the diaphragm wall 5, so that the main body provides sufficient support for the diaphragm wall and can prevent the diaphragm wall 5 from overturning into the foundation pit when the upper part 3 of the diaphragm wall is removed.

[0019] Furthermore, the upper surface of the step is vertical, and the lower surface is sloping, making the step part resemble a corbel, which improves the support strength.

[0020] The upper surface of the steps of the main body 2 is connected to the existing building 6 outside the diaphragm wall 5 through the post-cast strip 4, and the top surface of the post-cast strip 5 is flush with the top surface of the main body 2, which fully meets the design requirements.

[0021] Furthermore, the main body 2 is provided with a first reserved reinforcing bar 8. The outer end of the first reserved reinforcing bar 8 extends beyond the upper facade of the step and is provided with a first threaded joint 9. At the same time, the existing building 6 is provided with a second reserved reinforcing bar 12. The end of the second reserved reinforcing bar 12 adjacent to the diaphragm wall is provided with a second threaded joint 11. Correspondingly, it also includes a connecting reinforcing bar 10, whose two ends are respectively connected to the first threaded joint 9 and the second threaded joint 11, and placed in the post-cast strip 4, so that the main body is effectively connected to the existing building. Preferably, there are multiple sets of the first and second reserved reinforcing bars to ensure a firm connection.

[0022] Furthermore, it also includes a water-stop steel plate 7, which is disposed at the connection between the body 2 and the post-cast strip 4. Its length is equivalent to the width of the body 2 and it is placed within the body 2 and the post-cast strip 4, which can prevent moisture from the surface of the body from seeping in from the connection and causing damage to the structure.

[0023] The construction process of this utility model is as follows: First, the main body is constructed so that its two sides are connected to the cast-in-place pile support on both sides of the deep foundation pit and the inner wall of the diaphragm wall, so as to ensure that the diaphragm wall is effectively supported.

[0024] Then, the upper part of the diaphragm wall is removed so that the upper surface of the diaphragm wall is flush with the top surface of the lower step of the main body.

[0025] Then, the first and second pre-embedded steel bars are connected with connecting steel bars, and a post-cast strip is poured between the upper facade of the steps and the existing building to firmly connect the main body with the existing building.

[0026] Therefore, this utility model not only ensures the structural strength of the channel bottom plate, but also effectively prevents the overturning of the diaphragm wall, ensuring the smooth progress of construction.

[0027] The parts not covered in this utility model are the same as or can be implemented using existing technologies.

Claims

1. A channel bottom plate structure for use in deep foundation pits, comprising a body, characterized in that, The main body is flat and is set in a deep foundation pit. Its left and right sides are connected to the inner walls of the cast-in-place pile support and the diaphragm wall set on both sides of the deep foundation pit, respectively. The left side of the main body is a straight side, and its right side is a Z-shaped downward step. The outer end face of the step is connected to the inner wall of the diaphragm wall, and its upper facade is connected to the existing building outside the diaphragm wall through a post-cast strip.

2. The channel bottom plate structure applied in deep foundation pits according to claim 1, characterized in that, The upper surface of the step is a vertical surface, and its lower surface is a sloping surface.

3. The channel bottom plate structure applied in deep foundation pits according to claim 1, characterized in that, The top surface of the post-cast strip is flush with the top surface of the body.

4. The channel bottom plate structure applied in deep foundation pits according to claim 1, characterized in that, The main body is provided with a first reserved steel bar; the outer end of the first reserved steel bar extends beyond the upper facade of the step and is provided with a first threaded joint; the existing building is provided with a second reserved steel bar; the end of the second reserved steel bar near the diaphragm wall is provided with a second threaded joint; it also includes a connecting steel bar, the two ends of which are respectively connected to the first threaded joint and the second threaded joint, and placed in the post-cast strip.

5. The channel bottom plate structure applied in deep foundation pits according to claim 1, characterized in that, It also includes a water-stop steel plate, which is set at the connection between the body and the post-cast strip, and its length is equivalent to the width of the body and is placed within the body and the post-cast strip.

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