A deep foundation pit inverted arch prestressed concrete support structure and construction method thereof

Abstract

A deep foundation pit inverted arch prestressed concrete support structure and a construction method thereof, the support structure comprising: a foundation pit retaining pile wall for installing a concrete waist beam; a concrete waist beam for installing a concrete ring beam; the concrete waist beam is closely attached to the inner wall of the foundation pit retaining pile wall; a concrete support beam for supporting the concrete ring beam; the first end of the concrete support beam is connected to the inner wall of the concrete waist beam and the second end is connected to the concrete ring beam; the concrete ring beam is used to install a concrete formwork to pour concrete and form a deep foundation pit; the outer wall of the concrete ring beam is connected to the concrete formwork. On the one hand, the present application controls the deformation of the foundation pit by applying prestress in stages before and during foundation pit excavation, thereby improving the level of protection for the surrounding environment; on the other hand, by providing a ring beam and a prestressed inverted arch beam, the integrity of the horizontal support structure is improved, and the cross-section of the ring beam can be reduced, thereby reducing the number of tree support piles.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction engineering, and in particular relates to a deep foundation pit inverted arch prestressed concrete support structure and a construction method thereof. Background Art

[0002] At present, ordinary reinforced concrete support beams are mostly used for supporting deep and large foundation pits. Due to the influence of spatial effects, large foundation pits have large deformations in the middle part, even exceeding the requirements for surrounding environmental protection. At the same time, ordinary concrete ring beams have large cross-sections and a large number of vertical supports, which affects the construction of the main structure of the horizontal support beams. Summary of the Invention

[0003] To solve the above problems, the present invention provides a deep foundation pit inverted arch prestressed concrete support structure, comprising:

[0004] Foundation pit retaining pile wall, used to install concrete waist beams;

[0005] Concrete waist beam, used for installing concrete ring beam; the concrete waist beam is closely attached to the inner wall of the foundation pit retaining pile wall;

[0006] A concrete support beam, used to support the concrete ring beam; the first end of the concrete support beam is connected to the inner wall of the concrete waist beam and the second end is connected to the concrete ring beam;

[0007] The concrete ring beam is used to install a concrete formwork to pour concrete and form a deep foundation pit; the outer side wall of the concrete ring beam is connected to the concrete formwork.

[0008] Preferably, it further comprises: a concrete bracing beam, both ends of which are respectively connected to the two opposite concrete waist beams and pass through the concrete ring beam.

[0009] Preferably, it also includes: a prestressed beam fixed end and a prestressed beam tensioning end, wherein the first end of the prestressed beam fixed end is connected to the inner wall of the concrete waist beam and the second end is connected to the outer wall of the concrete ring beam, and the first end of the prestressed beam tensioning end is connected to the inner wall of the concrete waist beam and the second end is connected to the outer wall of the concrete ring beam.

[0010] Preferably, it also includes: a fixed end anchor and a tension end anchor, the fixed end anchor is arranged on the fixed end of the prestressed beam, and the tension end anchor is arranged on the tension end of the prestressed beam.

[0011] Preferably, it also includes: an inverted arch prestressed support beam, the first end of the inverted arch prestressed support beam passes through the fixed end anchor to be connected to the fixed end of the prestressed beam, and the second end passes through the tensioning end anchor to be connected to the tensioning end of the prestressed beam, and passes through the concrete ring beam.

[0012] Preferably, it also includes: unbonded prestressed tendons at corners, which are arranged inside the inverted arch prestressed support beam and have a first end connected to the fixed end of the prestressed beam and a second end connected to the tensioning end of the prestressed beam.

[0013] Preferably, it also includes: a middle unbonded prestressed tendon, which is arranged inside the inverted arch prestressed support beam and has a first end connected to the fixed end of the prestressed beam and a second end connected to the tensioning end of the prestressed beam.

[0014] Preferably, it also includes: steel bars, which are arranged inside the inverted arch prestressed support beam, and whose two ends are respectively arranged in the fixed end anchor and the tensioning end anchor.

[0015] Preferably, it further comprises: a tree support pile steel column, wherein the tree support pile steel column is arranged at the bottom of the concrete ring beam.

[0016] The present application also provides a method for constructing a deep foundation pit inverted arch prestressed concrete support structure, characterized in that the deep foundation pit inverted arch prestressed concrete support structure comprises any of the deep foundation pit inverted arch prestressed concrete support structures described above, and the method comprises the steps of:

[0017] Build a foundation pit retaining pile wall around the deep foundation pit at the preset location;

[0018] Building a concrete waist beam along the inner wall of the foundation pit retaining pile wall so that the outer wall of the concrete waist beam is tightly pressed against the inner wall of the foundation pit retaining pile wall;

[0019] Building a concrete formwork and a concrete ring beam along a preset position, so that the outer wall of the concrete ring beam is connected to the concrete formwork;

[0020] pouring concrete along the concrete formwork to form a deep foundation pit;

[0021] A concrete support beam is built between the concrete waist beam and the concrete ring beam, so that the first end of the concrete support beam is tightly pressed against the inner wall of the concrete waist beam and the second end is tightly pressed against the outer wall of the concrete ring beam.

[0022] The present application provides a deep foundation pit inverted arch prestressed concrete support structure and a construction method thereof, which are suitable for the field of deformation control of large and deep foundation pits with high protection requirements such as the presence of sensitive buildings, pipelines or rail transit in the surrounding area. On the one hand, before and during the excavation of the foundation pit, the deformation of the foundation pit is controlled by applying prestress in stages, thereby improving the level of protection of the surrounding environment; on the other hand, by arranging ring beams and prestressed inverted arch beams, the integrity of the horizontal support structure is improved, and the cross-section of the ring beam can be reduced, thereby reducing the number of tree support piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic diagram of a top view of a deep foundation pit inverted arch prestressed concrete support structure provided by the present invention;

[0025] Figure 2 This is a schematic cross-sectional view of a deep foundation pit inverted arch prestressed concrete support structure provided by the present invention;

[0026] Figure 3 This is a front view structural schematic diagram of an inverted arch prestressed concrete support beam in a deep foundation pit inverted arch prestressed concrete support structure provided by the present invention;

[0027] Figure 4 The present invention provides a schematic structural diagram of a front view of an inverted arch prestressed concrete support beam in a deep foundation pit inverted arch prestressed concrete support structure. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0029] like Figure 1-4 In an embodiment of the present application, the present application provides a deep foundation pit inverted arch prestressed concrete support structure, including: a foundation pit retaining pile wall 1, a concrete waist beam 2, a concrete support beam 3 and a concrete ring beam 4. Each part is described in detail below.

[0030] like Figure 1-4 In an embodiment of the present application, the present application provides a deep foundation pit inverted arch prestressed concrete support structure, comprising:

[0031] Foundation pit retaining pile wall 1, used for installing concrete waist beam 2;

[0032] The concrete waist beam 2 is used to install the concrete ring beam 4; the concrete waist beam 2 is close to the inner wall of the foundation pit retaining pile wall 1;

[0033] A concrete support beam 3 is used to support the concrete ring beam 4; the first end of the concrete support beam 3 is connected to the inner wall of the concrete waist beam 2 and the second end is connected to the concrete ring beam 4;

[0034] The concrete ring beam 4 is used to install a concrete formwork to pour concrete and form a deep foundation pit; the outer side wall of the concrete ring beam 4 is connected to the concrete formwork.

[0035] When constructing a deep foundation pit, first, a foundation pit retaining pile wall 1 is set up outside the underground project of the construction project, and then a concrete waist beam 2 is set up along the inner wall of the foundation pit retaining pile wall 1, and then a concrete formwork and a concrete ring beam 4 are set up at a predetermined position, and the outer wall of the concrete ring beam 4 is connected to the concrete formwork, and then concrete is poured along the concrete formwork to form a deep foundation pit; finally, concrete support beams 3 are set up at multiple locations between the concrete waist beam 2 and the concrete ring beam 4, and the first end of the concrete support beam 3 is connected to the inner wall of the concrete waist beam 2 and the second end is connected to the concrete ring beam 4, which is used to support the concrete ring beam 4, and then support the concrete formwork, so that the formed deep foundation pit has good support and is not easy to deform.

[0036] like Figure 1-4 In an embodiment of the present application, a deep foundation pit inverted arch prestressed concrete support structure is provided, further comprising: a concrete bracing beam 5, the ends of which are connected to the two opposing concrete waist beams 2 and pass through the concrete ring beam 4. The concrete bracing beam 5 is used to support the two opposing concrete waist beams 2 and enhance the stability between the concrete ring beam 4 and the concrete waist beam 2.

[0037] like Figure 1-4 In an embodiment of the present application, the present application provides a deep foundation pit inverted arch prestressed concrete support structure further comprising: a prestressed beam fixed end 9 and a prestressed beam tensioning end 10, wherein the first end of the prestressed beam fixed end 9 is connected to the inner wall of the concrete waist beam 2 and the second end is connected to the outer wall of the concrete ring beam 4, and the first end of the prestressed beam tensioning end 10 is connected to the inner wall of the concrete waist beam 2 and the second end is connected to the outer wall of the concrete ring beam 4. The prestressed beam fixed end 9 and the prestressed beam tensioning end 10 can be used to connect the inner wall of the concrete waist beam 2 and the outer wall of the concrete ring beam 4, while enhancing the stability between the concrete waist beam 2 and the concrete ring beam 4.

[0038] like Figure 1-4In an embodiment of the present application, the present application provides a deep foundation pit inverted arch prestressed concrete support structure further comprising: a fixed end anchor 13, a tensioning end anchor 14, and an inverted arch prestressed support beam 6, wherein the fixed end anchor 13 is provided on the fixed end 9 of the prestressed beam, and the tensioning end anchor 14 is provided on the tensioning end 10 of the prestressed beam. The first end of the inverted arch prestressed support beam 6 passes through the fixed end anchor 13 and is connected to the fixed end 9 of the prestressed beam, while the second end passes through the tensioning end anchor 14 and is connected to the tensioning end 10 of the prestressed beam, and passes through the concrete ring beam 4. The fixed end anchor 13 and the tensioning end anchor 14 can be used to fix the two ends of the inverted arch prestressed support beam 6, and the inverted arch prestressed support beam 6 can be used to enhance the stability between the concrete ring beam 4, the fixed end 9 of the prestressed beam, and the tensioning end 10 of the prestressed beam.

[0039] like Figure 1-4 In an embodiment of the present application, a deep foundation pit inverted arch prestressed concrete support structure is provided, further comprising: corner unbonded prestressed tendons 7, which are disposed within the inverted arch prestressed support beam 6 and have a first end connected to the prestressed beam fixed end 9 and a second end connected to the prestressed beam tensioning end 10. The corner unbonded prestressed tendons 7 are disposed within the inverted arch prestressed support beam 6 and can be used to enhance the strength of the inverted arch prestressed support beam 6, thereby enhancing the stability between the concrete ring beam 4, the prestressed beam fixed end 9, and the prestressed beam tensioning end 10.

[0040] like Figure 1-4 In an embodiment of the present application, the present application provides a deep foundation pit inverted arch prestressed concrete support structure further comprising: a middle unbonded prestressed tendon 8, wherein the middle unbonded prestressed tendon 8 is disposed inside the inverted arch prestressed support beam 6 and has a first end connected to the prestressed beam fixed end 9 and a second end connected to the prestressed beam tensioning end 10. The middle unbonded prestressed tendon 8 is disposed inside the inverted arch prestressed support beam 6 and can be used together with the corner unbonded prestressed tendons 7 to enhance the strength of the inverted arch prestressed support beam 6, thereby enhancing the stability between the concrete ring beam 4, the prestressed beam fixed end 9, and the prestressed beam tensioning end 10.

[0041] like Figure 1-4 In an embodiment of the present application, the present application provides a deep foundation pit inverted arch prestressed concrete support structure further comprising: a steel bar 11, the steel bar 11 being arranged inside the inverted arch prestressed support beam 6, and having its two ends respectively arranged in the fixed end anchor 13 and the tensioning end anchor 14. The steel bar 11 is arranged inside the inverted arch prestressed support beam 6, and can be used together with the corner unbonded prestressed tendons 7 and the middle unbonded prestressed tendons 8 to enhance the strength of the inverted arch prestressed support beam 6, thereby enhancing the stability between the concrete ring beam 4, the prestressed beam fixed end 9, and the prestressed beam tensioning end 10.

[0042] like Figure 1-4 In an embodiment of the present application, the present application provides a deep foundation pit inverted arch prestressed concrete support structure further comprising: a tree support pile steel column 12, which is arranged at the bottom of the concrete ring beam 4. The tree support pile steel column 12 can be used to support the concrete ring beam 4 to meet different height requirements.

[0043] In the embodiment of the present application, the present application also provides a method for constructing a deep foundation pit inverted arch prestressed concrete support structure, wherein the deep foundation pit inverted arch prestressed concrete support structure comprises: Figure 1-4 The deep foundation pit inverted arch prestressed concrete supporting structure described in the method comprises the steps of:

[0044] Construct a foundation pit retaining pile wall 1 around the deep foundation pit at a preset location;

[0045] Build a concrete waist beam 2 along the inner wall of the foundation pit retaining pile wall 1, so that the outer wall of the concrete waist beam 2 is tightly pressed against the inner wall of the foundation pit retaining pile wall 1;

[0046] Build a concrete formwork and a concrete ring beam 4 along a preset position, so that the outer wall of the concrete ring beam 4 is connected to the concrete formwork;

[0047] pouring concrete along the concrete formwork to form a deep foundation pit;

[0048] A concrete support beam 3 is built between the concrete waist beam 2 and the concrete ring beam 4 so that a first end of the concrete support beam 3 is pressed against the inner wall of the concrete waist beam 2 and a second end is pressed against the outer wall of the concrete ring beam 4 .

[0049] The present application provides a deep foundation pit inverted arch prestressed concrete support structure and a construction method thereof, which are suitable for the field of deformation control of large and deep foundation pits with high protection requirements such as the presence of sensitive buildings, pipelines or rail transit in the surrounding area. On the one hand, before and during the excavation of the foundation pit, the deformation of the foundation pit is controlled by applying prestress in stages, thereby improving the level of protection of the surrounding environment; on the other hand, by arranging ring beams and prestressed inverted arch beams, the integrity of the horizontal support structure is improved, and the cross-section of the ring beam can be reduced, thereby reducing the number of tree support piles.

[0050] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or illustrative of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention. In addition, the appended claims are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A deep foundation pit inverted arch prestressed concrete support structure, characterized in that: include: Foundation pit retaining pile wall, used to install concrete waist beams; Concrete waist beams for mounting concrete ring beams; The concrete waist beam is closely attached to the inner wall of the foundation pit retaining pile wall; A concrete support beam, used to support the concrete ring beam; the first end of the concrete support beam is connected to the inner wall of the concrete waist beam and the second end is connected to the concrete ring beam; A concrete ring beam is used to install a concrete formwork to pour concrete and form a deep foundation pit; the outer side wall of the concrete ring beam is connected to the concrete formwork; It also includes: a fixed end of a prestressed beam and a tensioned end of a prestressed beam, a fixed end anchor and a tensioned end anchor, an inverted prestressed support beam, unbonded prestressed tendons at corners, and unbonded prestressed tendons at the middle; The first end of the inverted arch prestressed support beam passes through the fixed end anchor to be connected to the fixed end of the prestressed beam, and the second end passes through the tensioning end anchor to be connected to the tensioning end of the prestressed beam and passes through the concrete ring beam; The unbonded prestressed tendons at the corners are arranged inside the inverted arch prestressed support beam, with the first end connected to the fixed end of the prestressed beam and the second end connected to the tensioning end of the prestressed beam; The middle unbonded prestressed tendon is arranged inside the inverted arch prestressed support beam, and the first end is connected to the fixed end of the prestressed beam and the second end is connected to the tensioning end of the prestressed beam.

2. The deep foundation pit inverted arch prestressed concrete support structure according to claim 1, characterized in that: Also includes: A concrete bracing beam, wherein both ends of the concrete bracing beam are respectively connected to the two opposite concrete waist beams and pass through the concrete ring beam.

3. The deep foundation pit inverted arch prestressed concrete support structure according to claim 1, characterized in that: The first end of the fixed end of the prestressed beam is connected to the inner wall of the concrete waist beam and the second end is connected to the outer wall of the concrete ring beam. The first end of the tensioning end of the prestressed beam is connected to the inner wall of the concrete waist beam and the second end is connected to the outer wall of the concrete ring beam.

4. The deep foundation pit inverted arch prestressed concrete support structure according to claim 3, characterized in that: The fixed end anchor is arranged on the fixed end of the prestressed beam, and the tensioned end anchor is arranged on the tensioned end of the prestressed beam.

5. The deep foundation pit inverted arch prestressed concrete support structure according to claim 1, characterized in that: Also includes: The steel bar is arranged inside the inverted arch prestressed support beam, and its two ends are respectively arranged in the fixed end anchor and the tensioning end anchor.

6. The deep foundation pit inverted arch prestressed concrete support structure according to any one of claims 1 to 5, characterized in that: Also includes: A tree support pile steel column is arranged at the bottom of the concrete ring beam.

7. A method for constructing a deep foundation pit inverted arch prestressed concrete support structure, characterized in that: The deep foundation pit inverted arch prestressed concrete support structure comprises the deep foundation pit inverted arch prestressed concrete support structure according to any one of claims 1 to 6, and the method comprises the steps of: Build a foundation pit retaining pile wall around the deep foundation pit at the preset location; Building a concrete waist beam along the inner wall of the foundation pit retaining pile wall so that the outer wall of the concrete waist beam is tightly pressed against the inner wall of the foundation pit retaining pile wall; Building a concrete formwork and a concrete ring beam along a preset position, so that the outer wall of the concrete ring beam is connected to the concrete formwork; pouring concrete along the concrete formwork to form a deep foundation pit; A concrete support beam is built between the concrete waist beam and the concrete ring beam, so that the first end of the concrete support beam is tightly pressed against the inner wall of the concrete waist beam and the second end is tightly pressed against the outer wall of the concrete ring beam.

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