Furrow support retaining wall structure and furrow backfill method using existing underground structure

Abstract

The application discloses a kind of fertilizer groove supporting retaining wall structure and fertilizer groove backfilling method using existing underground structure, comprising: two superimposed walls, including superimposed multiple unit wallboards, opposite sides of unit wallboard and the supporting structure of deep foundation pit, underground structure between deep foundation pit respectively form post-cast space, opposite sides of unit wallboard are respectively anchored in the outer wall of supporting structure and underground structure by planting reinforcement, bottom of unit wallboard is formed with pressure plate;Cast-in-place concrete is poured in post-cast space and coated in planting reinforcement;Tie assembly, including multiple cables and counterforce beams, unit wallboard forms multiple reserved holes, cable is arranged in reserved hole, counterforce beam is pressed to the outside of unit wallboard, one end of cable is connected to counterforce beam, the other end of cable extends to the inside of unit wallboard and is connected to supporting structure.The application solves the problem that process insertion needs to backfill fertilizer groove in advance, and the construction time of full backfilling of fertilizer groove is long, which affects construction period.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a trench support retaining wall structure utilizing existing underground structures and a trench backfilling method. Background Technology

[0002] In the early stages of earthwork excavation for projects with deep foundation pits, internal ramps need to be reserved. After the underground structure is constructed to ±0, backfilling of the trench cannot be carried out due to the ramp's limitations; backfilling can only be done after the internal ramp is removed. During the demolition of the ramp, the construction site is limited, material transportation channels are obstructed, and the underground structure is isolated from the outside world by the trench. Due to the overlapping of work processes, the trench needs to be backfilled in advance.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, a trench support retaining wall structure and trench backfilling method using existing underground structures are provided to solve the problem that existing deep foundation pits require advance backfilling of trenches due to overlapping construction processes, and that the construction time for backfilling all trenches is long, affecting the construction period.

[0005] To achieve the above objectives, a trench support retaining wall structure utilizing existing underground structures is provided, comprising:

[0006] Two overlapping walls are erected vertically in the trench of a deep foundation pit. The overlapping walls include multiple layers of unit wall panels stacked together. The opposite sides of the unit wall panels form post-cast spaces with the support structure of the deep foundation pit and the underground structure of the deep foundation pit, respectively. The opposite sides of the unit wall panels are anchored to the outer walls of the support structure and the underground structure by rebar. A bearing plate is formed at the bottom of the unit wall panels.

[0007] Cast-in-place concrete is poured into the post-cast space and covers the reinforcing bars;

[0008] The tie assembly includes multiple stay cables and a reaction beam. The unit wall panel has multiple reserved holes. The stay cables pass through the reserved holes. The reaction beam presses against the outside of the unit wall panel. One end of the stay cable is connected to the reaction beam. The other end of the stay cable extends to the inside of the unit wall panel and is connected to the support structure.

[0009] Furthermore, a socket groove is formed at the bottom of the unit wall panel, and the insertion protrusion of the unit wall panel is inserted into the socket groove of the upper unit wall panel.

[0010] Furthermore, the pressure plate is disposed on the inner side of the unit wall panel.

[0011] Furthermore, stiffening ribs are formed between the bearing plate and the inner side of the unit wall panel.

[0012] Furthermore, the unit wall panel is arranged along the width direction of the trough.

[0013] Furthermore, the plurality of the reserved holes are arranged along the width direction of the trough.

[0014] This invention provides a method for backfilling trenches using a trench support retaining wall structure that utilizes existing underground structures, comprising the following steps:

[0015] a. Divide the fertilizer trench into an advance backfilling section and a follow-up backfilling section;

[0016] b. At both ends of the advanced backfill section, rebar is implanted in the outer walls of the support structure and the underground structure;

[0017] c. Install a unit wall panel at each end of the pre-fill section, and connect the opposite sides of the unit wall panel to the reinforcing bars in the outer wall of the support structure and the underground structure, so that the opposite sides of the unit wall panel form a post-pouring space between the support structure of the deep foundation pit and the underground structure of the deep foundation pit.

[0018] d. The reaction beam of the tie assembly presses against the outer side of the first-layer unit wall panel;

[0019] e. The stay cable of the tie assembly passes through the reserved hole of the first-floor unit wall panel, and one end of the stay cable of the tie assembly is connected to the reaction beam, and the other end of the stay cable extends to the inner side of the first-floor unit wall panel and is connected to the support structure.

[0020] f. Cast-in-place concrete is poured in the post-cast space, and the cast-in-place concrete covers the anchored rebar;

[0021] g. Backfill soil between the first-layer unit wall panels at both ends of the advanced backfill section;

[0022] h. Repeat steps b to g, backfilling the advanced backfill section layer by layer from bottom to top.

[0023] The beneficial effects of this invention are that it utilizes the existing underground structure of the trench support retaining wall structure, and uses the support structures on both sides of the trench and the outer wall of the underground structure to erect a composite wall. The composite wall is formed by stacking multiple layers of prefabricated unit wall panels. Each side of the unit wall panel is connected to the support structure through tie components to form a stable retaining structure, which enables the pre-filling of local trench sections, allows for the interleaving of processes, and shortens the construction period. Attached Figure Description

[0024] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of a trench support retaining wall structure utilizing existing underground structures, according to an embodiment of the present invention.

[0026] Figure 2 This is a top view of the trench support retaining wall structure utilizing existing underground structures, according to an embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of the structure of the unit wall panel according to an embodiment of the present invention.

[0028] Figure 4 This is a top view of a unit wall panel according to an embodiment of the present invention.

[0029] Figure 5 This is a side view of a unit wall panel according to an embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram of the structure of the other end of the stay cable in an embodiment of the present invention.

[0031] Figure 7 This is a frontal structural diagram of the other end of the stay cable in an embodiment of the present invention. Detailed Implementation

[0032] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] Reference Figures 1 to 7 As shown, the present invention provides a trench support retaining wall structure utilizing existing underground structures, comprising: a composite wall 1, cast-in-place concrete 2, and tie components.

[0035] In this embodiment, the trench is divided into an advance backfilling section and a follow-up backfilling section. The follow-up backfilling section is backfilled normally according to the construction schedule. The advance backfilling section is backfilled before the follow-up backfilling section.

[0036] Specifically, the two composite walls 1 are erected vertically in the deep foundation pit. In this embodiment, the two composite walls are respectively set at both ends of the pre-fill section of the deep foundation pit.

[0037] The composite wall 1 comprises multiple layers of unit wall panels 11 stacked together. Post-cast spaces are formed between the opposite sides of the unit wall panels 11 and the support structure 4 of the deep foundation pit, and between the unit wall panels 11 and the underground structure of the deep foundation pit. A post-cast space is formed between one side of the unit wall panel 11 and the support structure 4 of the deep foundation pit; a post-cast space is formed between the other side of the unit wall panel 11 and the outer wall of the underground structure of the deep foundation pit.

[0038] The opposite sides of the unit wall panel 11 are anchored to the support structure 4 and the outer wall 5 of the underground structure respectively by rebar 112. A bearing plate 12 is formed at the bottom of the unit wall panel 11. After backfilling in the advanced backfill section, the backfill soil presses against the bearing plate, improving the bearing capacity and structural stability of the unit wall panel.

[0039] Cast-in-place concrete 2 is poured into the post-cast space. Cast-in-place concrete 2 covers the reinforcing bars 112 to form the post-cast section. The post-cast section firmly connects the unit wall panels to the outer wall of the support structure and the underground structure.

[0040] The tie assembly includes multiple stay cables 31 and a reaction beam 32.

[0041] In this embodiment, the unit wall panel is a precast wall panel. The unit wall panel 11 has multiple pre-drilled holes. The stay cable 31 passes through these pre-drilled holes. The reaction beam 32 presses against the outer side of the unit wall panel 11. One end of the stay cable 31 is connected to the reaction beam 32. The other end of the stay cable 31 extends to the inner side of the unit wall panel 11 and is connected to the support structure 4.

[0042] In a preferred embodiment, a socket groove 110 is formed at the bottom of the unit wall panel 11. An insertion protrusion 111 is formed on the unit wall panel 11. The insertion protrusion 111 is inserted into the socket groove 110 of the upper unit wall panel 11.

[0043] In this embodiment, the pressure plate 12 is disposed on the inner side of the unit wall panel 11.

[0044] In some embodiments, stiffening ribs (not shown in the figures) are formed between the bearing plate 12 and the inner side of the unit wall panel 11.

[0045] In a preferred embodiment, the unit wall panel 11 is arranged along the width direction of the groove. Multiple pre-drilled holes are also arranged along the width direction of the groove.

[0046] In this embodiment, the unit wall panels are arranged along the width direction of the pre-fill section. Multiple pre-reserved holes are also arranged along the width direction of the pre-fill section.

[0047] This invention provides a method for backfilling trenches using a trench support retaining wall structure that utilizes existing underground structures, comprising the following steps:

[0048] a. Divide the fertilizer trench into an advance backfilling section and a follow-up backfilling section.

[0049] b. At both ends of the advanced backfill section, rebar 112 is implanted in the outer wall 5 of the support structure 4 and the underground structure.

[0050] Precast unit wall panels are constructed based on the width of the pre-filled section on site. The unit wall panels are C30 concrete wall panels. Rebar is installed on both sides at both ends of the pre-filled section. After the rebar installation is completed, the external wall waterproofing of the underground structure is applied to the rebar installation area.

[0051] c. At both ends of the pre-fill section, a layer of unit wall panel 11 is erected, and the opposite sides of the layer of unit wall panel 11 are respectively connected to the reinforcing bars 112 in the support structure 4 and the outer wall 5 of the underground structure, so that the opposite sides of the layer of unit wall panel 11 and the support structure 4 of the deep foundation pit and the underground structure of the deep foundation pit respectively form a post-pouring space.

[0052] d. The reaction beam 32 of the tie assembly presses against the outer side of the first-floor unit wall panel 11.

[0053] e. The stay cable 31 of the tie assembly passes through the reserved hole of the first-floor unit wall panel 11, and one end of the stay cable 31 of the tie assembly is connected to the reaction beam 32, and the other end of the stay cable 31 extends to the inside of the first-floor unit wall panel 11 and is connected to the support structure 4.

[0054] Precast unit wall panels are installed in their respective positions, and the lapped reinforcing bars of the unit wall panels are connected to the anchor bars. Then, formwork is erected to form the post-cast space. After this, 25A channel steel is used as the reaction beam, and the reaction beam is connected to the stay cables through precast holes.

[0055] See Figure 6 and Figure 7 The other end of the stay cable passes over the anchor cable 41 on the support structure and is embedded between the anchor plate 42 and the anchor 43, and then is fixed with the rope clamp 33.

[0056] f. Pour cast-in-place concrete 2 in the post-pouring space, and the cast-in-place concrete 2 covers the rebar 112.

[0057] Cast-in-place C40 concrete. C40 concrete is poured in the post-cast space and cured until it reaches the design strength, after which the formwork is removed.

[0058] g. Backfill soil between the first-layer unit wall panels 11 at both ends of the advanced backfill section.

[0059] Backfill soil is backfilled inside the first-floor unit wall panel to complete the bottom layer backfill of the advanced backfill section.

[0060] h. Repeat steps b to g, backfilling the advanced backfill section layer by layer from bottom to top.

[0061] The present invention utilizes the existing underground structure of the trough support retaining wall structure. It uses the support structures on both sides of the trough and the outer wall of the underground structure to build a composite wall. The composite wall is formed by stacking multiple layers of prefabricated unit wall panels. Each unit wall panel is tied to the support structure through tie components to form a stable retaining structure, which realizes the advance backfilling of local sections of the trough and realizes the interleaving of processes.

[0062] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A trench support retaining wall structure utilizing existing underground structures, characterized in that, include: Two overlapping walls are erected vertically in the trench of a deep foundation pit. The overlapping walls include multiple layers of unit wall panels stacked together. The opposite sides of the unit wall panels form post-cast spaces with the support structure of the deep foundation pit and the underground structure of the deep foundation pit, respectively. The opposite sides of the unit wall panels are anchored to the outer walls of the support structure and the underground structure by rebar. A bearing plate is formed at the bottom of the unit wall panels. Cast-in-place concrete is poured into the post-cast space and covers the reinforcing bars; The tie assembly includes multiple stay cables and a reaction beam. The unit wall panel has multiple reserved holes. The stay cables pass through the reserved holes. The reaction beam presses against the outside of the unit wall panel. One end of the stay cable is connected to the reaction beam. The other end of the stay cable extends to the inside of the unit wall panel and is connected to the support structure.

2. The trench support retaining wall structure utilizing existing underground structures according to claim 1, characterized in that, The bottom of the unit wall panel has a socket groove, and the top of the unit wall panel has an insertion protrusion, which is inserted into the socket groove of the upper unit wall panel.

3. The trench support retaining wall structure utilizing existing underground structures according to claim 2, characterized in that, The pressure plate is located on the inner side of the unit wall panel.

4. The trench support retaining wall structure utilizing existing underground structures according to claim 3, characterized in that, A stiffening rib is formed between the bearing plate and the inner side of the unit wall panel.

5. The trench support retaining wall structure utilizing existing underground structures according to claim 1, characterized in that, The unit wall panel is arranged along the width direction of the trough.

6. The trench support retaining wall structure utilizing existing underground structures according to claim 5, characterized in that, The plurality of the reserved holes are arranged along the width direction of the trough.

7. A method for backfilling a trench using a trench support retaining wall structure based on any one of claims 1 to 6, characterized in that, Includes the following steps: a. Divide the fertilizer trench into an advance backfilling section and a follow-up backfilling section; b. At both ends of the advanced backfill section, rebar is implanted in the outer walls of the support structure and the underground structure; c. Install a unit wall panel at each end of the pre-fill section, and connect the opposite sides of the unit wall panel to the reinforcing bars in the outer wall of the support structure and the underground structure, so that the opposite sides of the unit wall panel form a post-pouring space between the support structure of the deep foundation pit and the underground structure of the deep foundation pit. d. The reaction beam of the tie assembly presses against the outer side of the first-layer unit wall panel; e. The stay cable of the tie assembly passes through the reserved hole of the first-floor unit wall panel, and one end of the stay cable of the tie assembly is connected to the reaction beam, and the other end of the stay cable extends to the inner side of the first-floor unit wall panel and is connected to the support structure. f. Cast-in-place concrete is poured in the post-cast space, and the cast-in-place concrete covers the anchored rebar; g. Backfill soil between the first-layer unit wall panels at both ends of the advanced backfill section; h. Repeat steps b to g, backfilling the advanced backfill section layer by layer from bottom to top.

Images