A device for a side wall bottom formwork of a top-down construction method

Abstract

The application discloses a cover-excavation reverse construction method side wall bottom mold device and relates to the technical field of building construction. The cover-excavation reverse construction method side wall bottom mold device comprises a cover plate, a sand box and a base. The sand box comprises a rectangular bottom plate, first and second side plates oppositely arranged on the two long sides of the bottom plate, and third and fourth side plates oppositely arranged on the two short sides of the bottom plate. The top of the first side plate is provided with a first side lug, and the top of the second side plate is provided with a second side lug. The second side plate can be separated from the bottom plate in a direction away from the first side plate. The cover plate is supported on the top of the first side plate and the second side plate in a downward oblique direction from the first side plate to the second side plate and is limited between the first side lug and the second side lug. Steel bars are arranged vertically on the cover plate, and the base is arranged at the bottom of the bottom plate. The cover-excavation reverse construction method side wall bottom mold device can be used for bottom mold plugging and reinforcing of the bottom of a structural side wall, can reduce the installation difficulty and improve the recycling rate.

Description

Technical Field

[0001] This application relates to the field of building construction technology, specifically to a bottom formwork device for a cut-and-cover reverse construction method for side walls. Background Technology

[0002] Top-down construction is an advanced underground engineering construction technology. Its core concept is to first construct the columns, beams, and roof slabs of the underground structure, and then use these as supporting components to restore surface traffic above, while continuing soil excavation and underground main structure construction below. This method is suitable for situations with large excavation faces, shallow overburden, and surrounding buildings too close together, especially in cases where it is necessary to restore road traffic as soon as possible but a standardized overburden structure is lacking.

[0003] In the cut-and-cover reverse construction method, the bottom of the structural sidewalls needs to be reinforced with connecting steel bars and sealed with bottom formwork. Specific structural details can be found in CN114645551A and CN216839568U. Currently, the sealing of the sidewall bottom formwork mainly relies on manual installation of wooden formwork. However, due to the limited working space, the installation and reinforcement of wooden formwork is difficult, and the recycling rate is low, resulting in low construction efficiency. Furthermore, the quality of the pre-embedded steel bars is difficult to guarantee, requiring subsequent processing and increasing costs. Summary of the Invention

[0004] The purpose of this application is to provide a bottom formwork device for the side wall of the cut-and-cover reverse construction method, which solves the problems of difficult installation and reinforcement of wooden formwork and low recycling rate.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] A bottom formwork device for a cut-and-cover reverse construction method sidewall includes a cover plate, a sand box, and a base. The sand box includes a rectangular base plate, a first side plate and a second side plate oppositely disposed on the two long sides of the base plate, and a third side plate and a fourth side plate oppositely disposed on the two short sides of the base plate. The top of the first side plate is provided with a first side lug, and the top of the second side plate is provided with a second side lug. The second side plate can be separated from the base plate in a direction away from the first side plate. The cover plate is obliquely supported downward along the direction from the first side plate to the second side plate on the top of the first side plate and the second side plate, and is limited between the first side lug and the second side lug. The cover plate is vertically provided with reinforcing bar holes, and the base is disposed at the bottom of the base plate.

[0007] Furthermore, the sand box also includes a connecting plate disposed opposite to the first side plate. The first side plate and the connecting plate are respectively disposed on the long side of the bottom plate, and there is a steel reinforcement clearance space between the top of the connecting plate and the cover plate. The side of the connecting plate away from the first side plate is connected to the second side plate, and the second side plate can be separated from the connecting plate in a direction away from the connecting plate.

[0008] Furthermore, the connecting plate is connected to the second side plate via a snap-fit ​​structure.

[0009] Furthermore, the snap-fit ​​structure includes a first snap-fit ​​portion disposed on the connecting plate and a second snap-fit ​​portion disposed on the second side plate, wherein the first snap-fit ​​portion and the second snap-fit ​​portion engage in a snap-fit ​​cooperation.

[0010] Furthermore, the second side plate is provided with multiple sets of second snap-fit ​​parts from top to bottom.

[0011] Furthermore, reinforcing columns extending upwards are fixed at the four corners of the base plate, and the first side plate, the third side plate, and the fourth side plate are respectively fixedly connected to the reinforcing columns.

[0012] Furthermore, along the length of the base plate, the two ends of the cover plate are respectively provided with downwardly extending cover plate limiting ears.

[0013] Furthermore, a buckle plate is provided on the top of the outer surface of the third side plate or the fourth side plate, and the bottom of the buckle plate has a positioning groove extending along the width direction of the base plate.

[0014] Furthermore, the base includes several casters.

[0015] Furthermore, the casters include swivel wheels.

[0016] The beneficial effects of this application are:

[0017] The bottom formwork device for the cut-and-cover reverse construction method sidewall provided in this application embodiment is used to seal and reinforce the bottom of the structural sidewall; the cover plate, sand box and base can be assembled together outside the operating space and then moved into the operating space, thereby reducing the installation difficulty; after the structural sidewall is constructed, the bottom formwork device can be quickly dismantled, improving its recycling rate. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective view of the bottom formwork device for the cut-and-cover reverse construction sidewall provided in the embodiments of this application;

[0020] Figure 2 This is a front view of the bottom formwork device for the cut-and-cover reverse construction sidewall provided in the embodiments of this application;

[0021] Figure 3 yes Figure 2 Enlarged view of section A in the middle;

[0022] Figure 4 This is a side view of the bottom formwork device for the cut-and-cover reverse construction sidewall provided in the embodiments of this application;

[0023] Figure 5 This is an exploded view of the bottom formwork device for the cut-and-cover reverse construction sidewall provided in the embodiments of this application;

[0024] Figure 6 A schematic diagram of the structure for sealing the bottom of the structural sidewall using the cut-and-cover reverse construction sidewall bottom formwork device provided in the embodiments of this application;

[0025] Figure 7 This is a diagram showing the state of the sandbox during removal;

[0026] Figure 8 This is a diagram showing the state of the area when the second side panel was removed;

[0027] Figure 9 This is a diagram showing the state of the area when the cover plate is removed.

[0028] Figure label:

[0029] 10-Cover plate;

[0030] 101-Reinforcing bar hole;

[0031] 102 - Cover plate limiting lug;

[0032] 20-Sandbox;

[0033] 201-Base Plate;

[0034] 202 - First side panel;

[0035] 203 - Second side panel;

[0036] 2031 - Second Connector;

[0037] 204 - Third side panel;

[0038] 205 - Fourth side panel;

[0039] 206 - First Lateral Ear;

[0040] 207 - Second ear;

[0041] 208 - Connecting plate;

[0042] 2081 - First Connector;

[0043] 209 - Reinforced Column;

[0044] 210 - Buckle panel;

[0045] 2101 - Positioning groove;

[0046] 30 - Base;

[0047] 301 - Casters;

[0048] 40 - Steel bar. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0050] In the description of this application, the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in actual application, provided that the relative positional relationships shown in the accompanying drawings are satisfied.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] See Figure 1 , Figure 2 , Figure 4 , Figure 5This application provides a bottom formwork device for a cut-and-cover reverse construction method sidewall, including a cover plate 10, a sand box 20, and a base 30. The sand box 20 includes a rectangular base plate 201, a first side plate 202 and a second side plate 203 disposed opposite to each other on the two long sides of the base plate 201, and a third side plate 204 and a fourth side plate 205 disposed opposite to each other on the two short sides of the base plate 201. The top of the first side plate 202 is provided with a first side ear 206, and the top of the second side plate 203 is provided with a second side ear 207. The second side plate 203 can be separated from the base plate 201 in a direction away from the first side plate 202. The cover plate 10 is obliquely supported downward along the direction from the first side plate 202 to the second side plate 203 on the top of the first side plate 202 and the second side plate 203, and is limited between the first side ear 206 and the second side ear 207. The cover plate 10 is vertically provided with a rebar hole 101, and the base 30 is disposed at the bottom of the base plate 201.

[0053] The sandbox 20 includes a base plate 201, a first side plate 202, a second side plate 203, a third side plate 204, and a fourth side plate 205. The base plate 201 is a horizontally arranged rectangular structure. The first side plate 202 and the second side plate 203 are vertically arranged rectangular structures, facing each other and connected to the two long sides of the base plate 201 respectively. The top of the first side plate 202 is higher than the top of the second side plate 203, and the second side plate 203 can be separated from the base plate 201 in a direction away from the first side plate 202. The third side plate 204 and the fourth side plate 205 are vertically arranged rectangular structures, facing each other and connected to the two short sides of the base plate 201 respectively. This allows for the formation of a top-opening chamber between the base plate 201, the first side plate 202, the second side plate 203, the third side plate 204, and the fourth side plate 205. This chamber is filled with fine sand to pre-embed and fix the lower end of the reinforcing bar 40.

[0054] A first side ear 206 extending along its length direction is fixed to the top of the outer side of the first side plate 202, and a second side ear 207 extending along its length direction is fixed to the top of the outer side of the second side plate 203. The first side ear 206 and the second side ear 207 serve as limiting devices to limit the cover plate 10 in the width direction of the base plate 201.

[0055] The cover plate 10 is a rectangular structure with an incline, used to be placed on top of the sand box 20 and also serves as a bottom template. The cover plate 10 is supported diagonally downward along the direction from the first side plate 202 to the second side plate 203 on the first side plate 202 and the second side plate 203, and is limited between the first side lug 206 and the second side lug 207, so that the sand box 20 can reliably support the cover plate 10.

[0056] The cover plate 10 has two sets of reinforcing bar holes 101 spaced apart along its width. Each set of reinforcing bar holes 101 includes multiple holes spaced apart along the length of the cover plate 10. Each reinforcing bar hole 101 is vertically arranged to allow the reinforcing bars 40 in the structural side wall to pass through, and to pre-embed the lower end of the reinforcing bars 40 in the fine sand in the sand box 20. The base 30 is fixed to the bottom of the base plate 201 to support the base plate 201 and to provide a certain support height for the base plate 201.

[0057] The cut-and-cover reverse construction sidewall bottom formwork device provided in this application embodiment is used for bottom formwork sealing and reinforcement of the bottom of the structural sidewall. The specific construction process is as follows:

[0058] S1. Assemble the sidewall bottom formwork device, fill the inner cavity of the sand box 20 with fine sand, and then move the sidewall bottom formwork device into the operating space; see Figure 6 The second side plate 203 is tightly attached to the wall on its right side, and the lower end of the reinforcing bar 40 passes through the reinforcing bar hole 101 of the cover plate 10 and is inserted into the fine sand in the sand box 20; during subsequent concrete pouring, in order to prevent the bottom formwork of this side wall from moving, a limiting device that abuts against the first side plate 202 can also be fixed on the foundation; for simplified view, Figure 6 The structure of the limiting device is not shown.

[0059] S2, see also Figure 7 Concrete is poured on top of the cover plate 10 to form a structural side wall. After the concrete has solidified, the limiting device on the left side of the first side plate 202 is removed, and the sand box 20 is moved to the left. The top of the first side plate 202 is separated from the cover plate 10, the second side plate 203 is separated from the bottom plate 201, and there is a height difference between the lower end of the second side plate 203 and the foundation.

[0060] S3, see also Figure 8 Move the second side plate 203 downwards to separate it from the cover plate 10, and then the second side plate 203 can be removed from the operating space. See also Figure 9 Move the cover plate 10 downwards to separate the cover plate 10 from the reinforcing bar 40, and then remove the cover plate 10 from the operating space.

[0061] Compared with the prior art, the bottom formwork device for the cut-and-cover reverse construction side wall provided in this application embodiment allows the cover plate 10, sand box 20 and base 30 to be assembled together outside the operating space and then moved into the operating space, thereby reducing the installation difficulty; after the construction of the structural side wall is completed, the bottom formwork device can be quickly dismantled, improving its recycling rate.

[0062] In some embodiments, see Figure 5The sand box 20 also includes a connecting plate 208 disposed opposite to the first side plate 202. The first side plate 202 and the connecting plate 208 are respectively disposed on the long side of the bottom plate 201, and there is a steel bar clearance space between the top of the connecting plate 208 and the cover plate 10. The side of the connecting plate 208 away from the first side plate 202 is connected to the second side plate 203, and the second side plate 203 can be separated from the connecting plate 208 in a direction away from the connecting plate 208.

[0063] Specifically, the connecting plate 208 is a vertically oriented rectangular structure. The length of the connecting plate 208 is parallel to the length of the base plate 201, and the lower end of the connecting plate 208 is fixedly connected to the long side of the base plate 201. Correspondingly, using the connecting plate 208 to install and support the second side plate 203 can improve the convenience and stability of the installation of the second side plate 203. By forming a space between the top of the connecting plate 208 and the cover plate 10 to avoid interference with the reinforcing bars, when the side wall construction is completed and the bottom formwork device of the side wall is removed, interference between the connecting plate 208 and the reinforcing bars 40 can be avoided, ensuring that the bottom formwork device of the side wall can be removed smoothly.

[0064] In some embodiments, see Figure 5 The connecting plate 208 is connected to the second side plate 203 via a snap-fit ​​structure. Accordingly, the snap-fit ​​structure enables quick assembly and separation of the second side plate 203 and the connecting plate 208, requiring no other accessories during assembly and saving costs.

[0065] For example, see Figure 5 The snap-fit ​​structure includes a first snap-fit ​​part 2081 disposed on the connecting plate 208 and a second snap-fit ​​part 2031 disposed on the second side plate 203, wherein the first snap-fit ​​part 2081 and the second snap-fit ​​part 2031 are snap-fitted together.

[0066] For example, the first engaging portion 2081 can be a protrusion, and the second engaging portion 2031 can be a groove, with the protrusion engaging within the groove. Multiple protrusions can be included, spaced apart along the length of the connecting plate 208; multiple grooves can also be included, their number matching the number of protrusions and corresponding one-to-one, with each protrusion engaging within its corresponding groove. In other embodiments, the first engaging portion 2081 can also be a groove, and the second engaging portion 2031 can be a protrusion.

[0067] In some embodiments, see Figure 5 The second side plate 203 is provided with multiple sets of second snap-fit ​​portions 2031 from top to bottom. The multiple sets refer to at least two sets, and each set of second snap-fit ​​portions 2031 may include at least two portions spaced apart along the length direction of the second side plate 203.

[0068] Correspondingly, by setting multiple sets of second snap-fit ​​parts 2031, during assembly, the second snap-fit ​​parts 2031 of different heights can be snap-fitted and connected to the first snap-fit ​​part 2081, thereby adjusting the installation height of the second side plate 203, realizing the installation requirements of the cover plate 10 with different inclinations, and improving the flexibility and applicability of the entire side wall bottom formwork device.

[0069] In some embodiments, see Figure 1 , Figure 5 The base plate 201 has four corners fixed with upwardly extending reinforcing columns 209, and the first side plate 202, the third side plate 204 and the fourth side plate 205 are respectively fixedly connected to the reinforcing columns 209.

[0070] Correspondingly, the use of reinforcing columns 209 can improve the stability of sand box 20, increase the load-bearing capacity of sand box 20, enable it to withstand greater loads, help improve the stability of sand box 20 during use, and reduce the risks during construction.

[0071] Specifically, the reinforcing column 209 can be made of angle steel, round steel, or other structural steel. The lower end of the reinforcing column 209 is welded to the base plate 201. The first side plate 202, the third side plate 204, the fourth side plate 205, and the connecting plate 208 are welded to the reinforcing column 209. The first side plate 202, the third side plate 204, and the fourth side plate 205 are welded to the base plate 201.

[0072] In some embodiments, see Figure 1 , Figure 4 , Figure 5 Along the length of the base plate 201, the cover plate 10 has downwardly extending cover plate limiting ears 102 at both ends. Accordingly, when the cover plate 10 is placed on top of the sand box 20, the cover plate limiting ears 102 can be used to limit the cover plate 10 along the length of the base plate 201 by cooperating with the sand box 20.

[0073] In some embodiments, see Figure 1 , Figure 2 , Figure 3 , Figure 5 The top of the outer surface of the third side plate 204 or the fourth side plate 205 is provided with a buckle plate 210, and the bottom of the buckle plate 210 has a positioning groove 2101 extending along the width direction of the base plate 201.

[0074] For example, see Figure 5 The snap plate 210 is set on the top of the outer surface of the third side plate 204. When multiple side wall bottom formwork devices are installed side by side in the operating space, the top of the fourth side plate 205 of one side wall bottom formwork device can be snapped into the positioning groove 2101 of the snap plate 210 of another side wall bottom formwork device, so as to connect two adjacent side wall bottom formwork devices together and improve the reliability of construction.

[0075] In some embodiments, see Figure 2 , Figure 4 , Figure 5 The base 30 includes several casters 301.

[0076] For example, three sets of casters 301 are installed below the base plate 201 along its length, and each set of casters 301 includes two casters spaced apart along the width of the base plate 201.

[0077] Correspondingly, the casters 301 not only support the sand box 20, but also enable the sand box 20 to move quickly. When removing the sand box 20, the friction between it and the foundation can be reduced, thus saving effort.

[0078] Casters 301 may include swivel wheels, which allow 360° rotation, enabling the sandbox to move easily in any direction and greatly improving mobility. Of course, casters 301 may also include fixed wheels; no specific limitation is made here.

[0079] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A bottom formwork device for a side wall in a cut-and-cover reverse construction method, characterized in that, Includes a cover plate (10), a sand box (20), and a base (30); The sand box (20) includes a rectangular base plate (201), a first side plate (202) and a second side plate (203) disposed opposite to each other on the two long sides of the base plate (201), and a third side plate (204) and a fourth side plate (205) disposed opposite to each other on the two short sides of the base plate (201). The first side plate (202) is provided with a first side ear (206) at its top, and the second side plate (203) is provided with a second side ear (207) at its top. The second side plate (203) can be separated from the base plate (201) in a direction away from the first side plate (202). The cover plate (10) is obliquely supported downward along the direction from the first side plate (202) to the second side plate (203) on the top of the first side plate (202) and the second side plate (203), and is limited between the first side ear (206) and the second side ear (207); the cover plate (10) is provided with a steel bar hole (101) vertically, and the base (30) is provided at the bottom of the base plate (201); The sand box (20) also includes a connecting plate (208) disposed opposite to the first side plate (202). The first side plate (202) and the connecting plate (208) are respectively disposed on the long side of the bottom plate (201), and there is a steel bar clearance space between the top of the connecting plate (208) and the cover plate (10). The side of the connecting plate (208) away from the first side plate (202) is connected to the second side plate (203), and the second side plate (203) can be separated from the connecting plate (208) in a direction away from the connecting plate (208).

2. The bottom formwork device for the side wall in the cut-and-cover reverse construction method according to claim 1, characterized in that, The connecting plate (208) is connected to the second side plate (203) via a snap-fit ​​structure.

3. The bottom formwork device for the cut-and-cover reverse construction method sidewall as described in claim 2, characterized in that, The snap-fit ​​structure includes a first snap-fit ​​part (2081) disposed on the connecting plate (208) and a second snap-fit ​​part (2031) disposed on the second side plate (203), wherein the first snap-fit ​​part (2081) and the second snap-fit ​​part (2031) snap-fit ​​into each other.

4. The bottom formwork device for the cut-and-cover reverse construction method sidewall as described in claim 3, characterized in that, The second side plate (203) is provided with multiple sets of second snap-fit ​​parts (2031) from top to bottom.

5. The bottom formwork device for the side wall in the cut-and-cover reverse construction method according to claim 1, characterized in that, The base plate (201) has four corners fixed with upwardly extending reinforcing columns (209), and the first side plate (202), the third side plate (204) and the fourth side plate (205) are respectively fixedly connected to the reinforcing columns (209).

6. The bottom formwork device for the side wall in the cut-and-cover reverse construction method according to claim 1, characterized in that, Along the length of the base plate (201), the cover plate (10) is provided with downwardly extending cover plate limiting ears (102) at both ends.

7. The bottom formwork device for the side wall in the cut-and-cover reverse construction method according to claim 1, characterized in that, The top of the outer surface of the third side plate (204) or the fourth side plate (205) is provided with a buckle plate (210), and the bottom of the buckle plate (210) has a positioning groove (2101) extending along the width direction of the base plate (201).

8. The bottom formwork device for the side wall in the cut-and-cover reverse construction method according to claim 1, characterized in that, The base (30) includes several casters (301).

9. The bottom formwork device for the side wall in the cut-and-cover reverse construction method according to claim 8, characterized in that, The caster (301) includes a swivel caster.

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