A formwork-free structure for cast-in-place beams of underground assembled station and its construction method

Abstract

The present application relates to a formwork-free cast-in-place beam structure of an underground assembled station and a construction method thereof, which includes a ground-connected wall cast on the ground, a horizontal keel connected to the ground-connected wall at a position corresponding to the floor slab, precast beam shells evenly assembled on the horizontal keels, a support beam casting bracket set up at the bottom of the precast beam shells, support beam shells assembled between the precast beam shells, a clamping groove formed between the precast beam shells, the support beam shells and the horizontal keels, a precast board clamped in the clamping groove, and finally concrete is poured on the top of the precast beam shells, the support beam shells and the precast boards to form a surface layer. The present application has the effect of reducing the waste of manpower and material resources and improving construction efficiency.

Description

Technical Field

[0001] The present application relates to the field of subway station construction, and in particular to an underground assembled station cast-in-place beam formwork-free structure and a construction method thereof. Background Art

[0002] In the existing subway station construction projects, the construction of support beams usually involves the steps of setting up brackets, installing bottom formwork, tying steel bars, installing side formwork, and pouring concrete. This construction method is relatively mature and stable.

[0003] However, the traditional construction method has high requirements on the operation of personnel, and has strict requirements on the elevation, flatness, warping, materials, etc. of the formwork system. The level of the construction personnel limits the quality of the finished product. At the same time, in order to shorten the construction period, the traditional construction method usually uses more manpower for construction. At the same time, the steel bar binding time is long, and the scraps after the formwork processing are discarded, resulting in a waste of manpower and material resources, and the construction efficiency is low. Summary of the invention

[0004] In order to reduce the waste of manpower and material resources and improve construction efficiency, the present application provides a formwork-free structure of cast-in-place beams of an underground prefabricated station and a construction method thereof.

[0005] One purpose of the present application is to provide a formwork-free cast-in-place beam structure for an underground assembled station, which adopts the following technical solution:

[0006] A formwork-free cast-in-place beam structure for an underground assembled station comprises a ground-connected wall cast on the ground, a transverse keel is connected to the ground-connected wall at a position corresponding to the floor slab, precast beam shells are evenly assembled on the transverse keels, a supporting beam casting bracket is set up at the bottom of the precast beam shells, supporting beam shells are assembled between the precast beam shells, a clamping groove is formed between the precast beam shells, the supporting beam shells and the transverse keels, a precast plate is clamped in the clamping groove, and finally concrete is poured on the top of the precast beam shells, the supporting beam shells and the precast plates to form a surface layer.

[0007] By adopting the above technical scheme, when pouring the underground station floor, first set up the supporting beam casting bracket, then hoist the precast beam shell that meets the size of the floor slab to the top of the supporting beam casting bracket, assemble the precast beam shell, the supporting beam shell and the transverse keel together, install the precast slab, and finally pour the concrete surface layer. There is no need to tie steel bars before pouring. The precast beam shell and the supporting beam shell are the supporting beams, and there is no need to install the casting side formwork, and the removal of the side formwork is also omitted. The side wall of the precast beam shell is the side wall of the floor slab, and no grinding and polishing is required, thereby reducing manpower and material resources and improving construction efficiency.

[0008] Optionally, a pre-embedded plate is cast at the position of the floor corresponding to the ground-connected wall, and bolts are penetrated through the pre-embedded plate. The bolts pass through the transverse keel and are threadedly connected with nuts.

[0009] By adopting the above technical solution, when installing the transverse keel, the bolts are passed through the transverse keel and then fixed by nuts, which can facilitate the installation of the transverse keel.

[0010] Optionally, a cross-shaped plug-in groove is provided on the transverse keel, and a cross-shaped plug-in block is fixedly provided at the end of the prefabricated beam shell.

[0011] By adopting the above technical solution, when the prefabricated beam shell and the transverse keel are assembled together, the plug-in block at the end of the prefabricated beam shell is plugged into the transverse keel, so that the prefabricated beam shell can be fixed.

[0012] Optionally, the outer side wall of the prefabricated beam shell is evenly provided with a plurality of plug-in grooves having the same structure as the transverse keel, and plug-in blocks having the same structure as the end of the prefabricated beam shell are respectively fixed at both ends of the support beam shell.

[0013] By adopting the above technical solution, the plug-in block is plugged into the plug-in groove, which facilitates the splicing between the prefabricated beam shell and the supporting beam shell.

[0014] Optionally, a limit plate is fixedly provided on the top of the support beam casting bracket at a position corresponding to the precast beam shell, a limit slot is provided in the limit plate, and the precast beam shell is snapped into the limit slot.

[0015] By adopting the above technical solution, the limit slot is used to position the precast beam shell to prevent the position of the precast beam shell from shaking during the pouring of concrete. At the same time, when the top surface layer is poured, the limit plate is clamped to the bottom of the precast beam shell, which can facilitate the removal of the precast beam shell from the bottom of the precast beam shell.

[0016] Optionally, supporting steps are symmetrically provided on both sides of the prefabricated beam shell, clamping steps with the same structure as the supporting steps are provided on both sides of the supporting beam shell, and a limiting step is provided on the side of the transverse keel away from the ground-connected wall. The supporting steps, clamping steps and limiting steps are arranged at the same height and are used to support the prefabricated panels.

[0017] By adopting the above technical solution, when the prefabricated beam shell, the supporting beam shell and the transverse keel are assembled together, the limiting step, the supporting step and the clamping step cooperate to jointly support the prefabricated panel, thereby facilitating the fixation of the prefabricated panel.

[0018] Optionally, grooves are provided on the top of the precast beam shell and the top of the supporting beam shell, and multiple steel sleeves are symmetrically cast at both ends of the groove of the precast beam shell. The steel sleeve at one end of the precast beam shell is threaded, while the steel sleeve at the other end is not threaded, and both ends of the steel bar are respectively located in the steel sleeves.

[0019] By adopting the above technical solution, when installing the steel bar, one end of the steel bar is inserted into the non-threaded steel bar sleeve, and the other end of the steel bar is threadedly connected to the steel bar sleeve at the other end of the groove, so that the steel bar can be fixed in the outer shell of the prefabricated beam. The steel bar can strengthen the connectivity of the concrete poured in the groove, reduce concrete cracking, and enhance the stability of the concrete after pouring.

[0020] Another purpose provided by the present application is a construction method for a formwork-free cast-in-place beam structure of an underground prefabricated station.

[0021] A construction method for a cast-in-place beam formwork-free structure of an underground assembled station, comprising the following steps:

[0022] S1. Prefabricate the precast beam shell according to the size: measure the length of the floor slab, prefabricate the precast beam shell with the same length as the floor slab according to the length of the floor slab, and transport the prefabricated precast beam shell to the site;

[0023] S2. Fixing the transverse keel: When pouring the ground-connected wall, a pre-buried plate is poured at the position of the ground-connected wall corresponding to the floor. Bolts that pass through the ground-connected wall are inserted into the pre-buried plate. The bolts pass through the transverse keel and are threadedly connected with nuts, so that the transverse keel can be fixedly connected to the ground-connected wall;

[0024] S3. Setting up a support beam casting bracket: Setting up a support beam casting bracket at the bottom of the floor to be cast, and setting up a support plate on the top of the support beam casting bracket, so that the limit plate on the top of the support plate corresponds to the position of installing the prefabricated beam shell;

[0025] S4. Install the prefabricated beam shell and the supporting beam shell: during installation, first assemble the prefabricated beam shell and the supporting beam shell together, so that the plug-in block of the supporting beam shell is plugged into the plug-in groove of the side wall of the supporting beam, then hoist the assembled prefabricated beam shell and the supporting beam shell onto the supporting plate, then clamp the prefabricated beam shell into the limiting plate, and plug the plug-in block at the end of the prefabricated beam shell into the plug-in groove of the transverse keel;

[0026] S5. Install the prefabricated panels: place the prefabricated panels against the supporting steps, the clamping steps and the limiting steps, and assemble the prefabricated panels with the prefabricated beam shell and the supporting beam shell;

[0027] S6. Surface layer pouring: first pour concrete in the grooves of the precast beam shell and the supporting beam shell, and finally pour concrete on the precast beam shell, the supporting beam shell and the top of the precast panel to form the surface layer.

[0028] By adopting the above technical scheme, the precast beam shell is first prefabricated according to the width of the floor, and then the precast beam shell is transported to the site, and then the supporting beam casting bracket is set up, and then the precast beam shell that meets the size of the floor slab is hoisted to the top of the supporting beam casting bracket, the precast beam shell, the supporting beam shell and the transverse keel are assembled together, and then the precast slab is installed, and finally the concrete surface layer is poured. There is no need to tie steel bars before pouring. The precast beam shell and the supporting beam shell are the supporting beams, and there is no need to install the casting side formwork, and the removal of the side formwork is also omitted. The side wall of the precast beam shell is the side wall of the floor slab, and there is no need for grinding and polishing, etc., thereby reducing manpower and material resources and improving construction efficiency.

[0029] Optionally, in S6, before pouring the surface layer, the steel pipe is fixed to the top of the precast beam shell by a flange.

[0030] By adopting the above technical solution, the steel pipe is used to support the upper floor slab. When pouring the surface layer, the bottom and flange of the steel pipe are poured into the surface layer, which can enhance the stability of the steel pipe.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. A transverse keel is connected to the position of the ground-connected wall corresponding to the floor slab, and precast beam shells are evenly assembled on the transverse keels. A support beam casting bracket is set up at the bottom of the precast beam shells. A support beam shell is assembled between the precast beam shells. A clamping groove is formed between the precast beam shells, the support beam shells and the transverse keel. A precast board is clamped in the clamping groove. Finally, concrete is poured on the top of the precast beam shells, the support beam shells and the precast boards to form a surface layer, so that there is no need to tie steel bars before pouring. The precast beam shells and the support beam shells are the supporting beams, and there is no need to install the casting side formwork. The removal of the side formwork is also omitted. The side wall of the precast beam shell is the side wall of the floor slab, and no grinding and polishing is required, thereby reducing manpower and material resources and improving construction efficiency.

[0033] 2. A limit plate is fixedly installed at the top of the supporting beam casting bracket at a position corresponding to the precast beam shell, and a limit slot is provided in the limit plate. The precast beam shell is clamped in the limit slot. The limit slot is used to position the precast beam shell to prevent the position of the precast beam shell from shaking during the pouring of concrete. At the same time, when the top surface layer is poured, the limit plate is clamped at the bottom of the precast beam shell, which can facilitate the removal of the precast beam shell from the bottom of the precast beam shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is an axonometric view of an embodiment.

[0035] Figure 2 is an exploded view of an embodiment.

[0036] Figure 3It is an exploded view of the precast beam shell, support beam shell and transverse keel.

[0037] Figure 4 yes Figure 3 Enlarged view of part A.

[0038] Figure 5 It is a structural schematic diagram of the precast beam shell and the supporting beam shell.

[0039] Figure 6 It is a cross-sectional view of the precast beam shell.

[0040] Figure 7 yes Figure 6 Enlarged view of part B.

[0041] Explanation of the reference numerals in the accompanying drawings: 1. Ground-connected wall; 11. Embedded plate; 12. Horizontal keel; 121. Limiting step; 2. Prefabricated beam shell; 21. Plug-in slot; 22. Recess; 23. Supporting step; 24. Steel sleeve; 241. Steel bar; 242. Fixing cylinder; 243. Hinge; 244. Through hole; 3. Support beam shell; 31. Plug-in block; 32. Snap-in step; 4. Support beam casting bracket; 41. Support plate; 42. Limiting plate; 43. Limiting slot; 5. Prefabricated plate; 6. Steel pipe; 61. Flange; 7. Surface layer. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-7 This application is described in further detail.

[0043] The present application embodiment discloses a formwork-free cast-in-place beam structure for an underground assembled station. Figure 1 and Figure 2 A formwork-free cast-in-place beam structure of an underground assembled station includes a ground-connected wall 1 cast on the ground, and an embedded plate 11 is cast on the ground-connected wall 1 at a position corresponding to the floor. Bolts are penetrated through the embedded plate 11, and the bolts are connected to transverse keels 12 after passing through the ground-connected wall 1. After the bolts pass through the transverse keels 12, they are threadedly connected with nuts, so that the transverse keels 12 can be fixedly connected to the ground-connected wall 1.

[0044] A plurality of precast beam shells 2 are evenly connected to one side of the transverse keel 12 away from the ground-connected wall 1. The precast beam shells 2 are arranged perpendicular to the transverse keel 12. The length of the precast beam shells 2 is pre-cast according to the size of the floor. A cross-shaped plug-in groove 21 is opened on the transverse keel 12. A plug-in block 31 is fixed to the end of the precast beam shell 2, and the plug-in blocks 31 are arranged in a cross shape.

[0045] Referring to Figures 3 and 4, a support beam shell 3 is inserted between adjacent prefabricated beam shells 2. The cross-sections of the support beam shell 3 and the prefabricated beam shell 2 are the same. The outer side wall of the prefabricated beam shell 2 is evenly provided with a plurality of plug-in grooves 21 having the same structure as the transverse keel 12. Plug-in blocks 31 having the same structure as the end of the prefabricated beam shell 2 are respectively fixed at both ends of the support beam shell 3. The plug-in blocks 31 are inserted into the plug-in grooves 21 to facilitate the splicing between the prefabricated beam shell 2 and the support beam shell 3.

[0046] See also Figure 1 and Figure 4 Before setting up the precast beam shell 2, it is necessary to first set up a support beam casting bracket 4. The top of the support beam casting bracket 4 is used to support the precast beam shell 2. A support plate 41 is jointly built on the top of the support beam casting bracket 4. A limit plate 42 is fixedly provided on the top of the support plate 41 corresponding to the position of the precast beam shell 2. A limit slot 43 is provided in the limit plate 42. The limit slot 43 is used to position the precast beam shell 2 to prevent the position of the precast beam shell 2 from shaking during the pouring of concrete.

[0047] See also Figure 5 and Figure 6 , the top of the precast beam shell 2 and the support beam shell 3 is provided with a groove 22, the groove 22 is used for pouring concrete, thereby reducing the weight of the precast beam shell 2 and the support beam shell 3, the two sides of the length direction of the precast beam shell 2 are symmetrically provided with support steps 23, and the two sides of the length direction of the support beam shell 3 are provided with a clamping step 32 with the same structure as the support step 23, and the support step 23 and the clamping step 32 are arranged at the same height; when the precast beam shell 2 and the support beam shell 3 are assembled together, the precast board 5 is placed in the support step 23 and the clamping step 32, and the side of the transverse keel 12 away from the ground connecting wall 1 is provided with a limited step 121, and the limited step 121 cooperates with the support step 23 and the clamping step 32 to jointly support the precast board 5. Finally, concrete is poured on the top of the precast beam shell 2, the support beam shell 3 and the precast board 5 to form a surface layer 7, which can replace the traditional formwork and steel bar binding.

[0048] See also Figure 6 and Figure 7A plurality of steel sleeves 24 are cast in the groove 22 of the precast beam shell 2. The steel sleeves 24 are located at both ends of the groove 22, and the steel sleeves 24 at both ends are symmetrically arranged. A thread is provided in the steel sleeve 24 at one end of the precast beam shell 2, and the steel sleeve 24 at the other end of the precast beam shell 2 is not threaded. When installing the steel bar 241, one end of the steel bar 241 is inserted into the non-threaded steel sleeve 24, and the other end of the steel bar 241 is threadedly connected to the steel sleeve 24 at the other end of the groove 22, so that the steel bar 241 can be fixed in the precast beam shell 2; the steel bar 241 can strengthen the connectivity of the concrete cast in the groove 22 and reduce concrete cracking. The bottom of the steel bar 241 is connected to a steel bar 241 of the same structure. A fixing tube 242 is fixedly provided on the steel bar 241 at the bottom. Two arc-shaped hinges 243 are hinged on the top of the fixing tube 242. A through hole 244 for the bolt to pass through is provided at the end of the hinge 243 away from the fixing tube 242. The hinge 243 passes through the steel bar 241 fixed to the steel bar sleeve 24, and then the steel bar 241 and the hinge 243 are fixed by bolts and nuts. That is, another layer of steel bar 241 can be tied in the groove 22, which can enhance the stability of the concrete after pouring.

[0049] Replay Figure 2 The top of the precast beam shell 2 is bolted with a flange 61, on which a steel pipe 6 is fixed. The steel pipe 6 is used to support the upper floor slab. The flange 61 connection can facilitate the installation of the steel pipe 6. The bottom of the flange 61 and the steel pipe 6 are finally cast in the surface layer 7.

[0050] A construction method for a cast-in-place beam formwork-free structure of an underground assembled station, comprising the following steps:

[0051] S1. Prefabricate the prefabricated beam shell 2 according to the size: measure the length of the floor slab, prefabricate the prefabricated beam shell 2 of the length matching the length of the floor slab, and then transport the prefabricated prefabricated beam shell 2 to the site.

[0052] S2. Fix the transverse purlin 12: When casting the ground-connected wall 1, a pre-embedded plate 11 is cast at the position of the ground-connected wall 1 corresponding to the floor. The pre-embedded plate 11 is penetrated with bolts that pass through the ground-connected wall 1. The bolts pass through the transverse purlin 12. After the bolts pass through the transverse purlin 12, nuts are threadedly connected to the transverse purlin 12, thereby fixing the transverse purlin 12 to the ground-connected wall 1.

[0053] S3. Set up the support beam casting bracket 4: set up the support beam casting bracket 4 at the bottom of the floor to be cast, build a support plate 41 on the top of the support beam casting bracket 4, so that the limit plate 42 on the top of the support plate 41 corresponds to the position for installing the prefabricated beam shell 2.

[0054] S4. Install the prefabricated beam shell 2 and the support beam shell 3: During installation, first assemble the prefabricated beam shell 2 and the support beam shell 3 together, so that the plug-in block 31 of the support beam shell 3 is plugged into the plug-in groove 21 of the side wall of the support beam, and then hoist the assembled prefabricated beam shell 2 and the support beam shell 3 onto the support plate 41, first clamp the prefabricated beam shell 2 into the limit plate 42, so that the plug-in block 31 at the end of the prefabricated beam shell 2 is plugged into the plug-in groove 21 of the transverse keel 12, and then the prefabricated beam shell 2 and the support beam shell 3 can be installed on the top of the support plate 41.

[0055] S5. Install the prefabricated panel 5: clamp the prefabricated panel 5 between the prefabricated beam shell 2, the support beam shell 3 and the transverse keel 12, so that the prefabricated panel 5 abuts against the supporting step 23, the clamping step 32 and the limiting step 121, and assemble the prefabricated panel 5 with the prefabricated beam shell 2 and the support beam shell 3.

[0056] S6, pouring of surface layer 7: first pour concrete in the groove 22 of the precast beam shell 2 and the groove 22 of the support beam shell 3, and finally pour concrete on the precast beam shell 2, the support beam shell 3 and the top of the precast slab 5 to form the surface layer 7. Before pouring the surface layer 7, the steel pipe 6 used to support the upper floor slab needs to be fixed to the top of the precast beam shell 2 through the flange 61. When pouring the surface layer 7, the bottom of the steel pipe 6 and the flange 61 are poured into the surface layer 7.

[0057] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A formwork-free cast-in-place beam structure for an underground assembled station, characterized in that: The invention comprises a ground-connected wall (1) cast on the ground, wherein a transverse keel (12) is connected to the ground-connected wall (1) at a position corresponding to the floor slab, a precast beam shell (2) is evenly assembled on the transverse keel (12), a support beam casting bracket (4) is set at the bottom of the precast beam shell (2), a support beam shell (3) is assembled between the precast beam shells (2), a clamping groove is formed between the precast beam shells (2), the support beam shells (3) and the transverse keel (12), a precast board (5) is clamped in the clamping groove, and finally concrete is poured on the top of the precast beam shells (2), the support beam shells (3) and the precast board (5) to form a surface layer (7); A limiting plate (42) is fixedly provided at the top of the supporting beam casting bracket (4) at a position corresponding to the precast beam shell (2), a limiting slot (43) is provided in the limiting plate (42), and the precast beam shell (2) is clamped in the limiting slot (43); The top of the precast beam shell (2) and the top of the support beam shell (3) are both provided with a groove (22), and a plurality of steel bar (241) sleeves (24) are symmetrically cast at both ends of the groove (22) of the precast beam shell (2), a thread is provided in the steel bar (241) sleeve (24) at one end of the precast beam shell (2), and no thread is provided in the steel bar (241) sleeve (24) at the other end, and both ends of the steel bar (241) are respectively located in the steel bar (241) sleeve (24).

2. The formwork-free cast-in-place beam structure of an underground assembled station according to claim 1, characterized in that: An embedded plate (11) is cast at a position corresponding to the floor of the ground-connected wall (1), and bolts are penetrated through the embedded plate (11). The bolts pass through the transverse keel (12) and are threadedly connected with nuts.

3. The formwork-free cast-in-place beam structure of an underground assembled station according to claim 1, characterized in that: The transverse keel (12) is provided with a cross-shaped plug-in groove (21), and the end of the prefabricated beam shell (2) is fixedly provided with a cross-shaped plug-in block (31).

4. The formwork-free cast-in-place beam structure of an underground assembled station according to claim 3, characterized in that: The outer side wall of the prefabricated beam shell (2) is evenly provided with a plurality of plug-in grooves (21) having the same structure as the transverse keel (12), and plug-in blocks (31) having the same structure as the end of the prefabricated beam shell (2) are respectively fixedly provided at both ends of the support beam shell (3).

5. The formwork-free cast-in-place beam structure of an underground assembled station according to claim 1, characterized in that: Support steps (23) are symmetrically provided on both sides of the prefabricated beam shell (2), clamping steps (32) having the same structure as the support steps (23) are provided on both sides of the support beam shell (3), and a limiting step (121) is provided on the side of the transverse keel (12) away from the ground-connected wall (1), and the support step (23), the clamping step (32) and the limiting step (121) are arranged at the same height and are used to support the prefabricated panel (5).

6. A construction method for a formwork-free cast-in-place beam structure of an underground assembled station as claimed in any one of claims 1 to 5, characterized in that: The steps include: S1. Prefabricate the prefabricated beam shell (2) according to the size: measure the length of the floor slab, prefabricate the prefabricated beam shell (2) with the same length as the floor slab according to the length of the floor slab, and transport the prefabricated prefabricated beam shell (2) to the site; S2. Fixing the transverse keel (12): When casting the ground-connected wall (1), a pre-embedded plate (11) is cast at a position corresponding to the floor on the ground-connected wall (1). Bolts that pass through the ground-connected wall (1) are inserted into the pre-embedded plate (11). The bolts pass through the transverse keel (12) and are threadedly connected with nuts, thereby fixing the transverse keel (12) to the ground-connected wall (1); S3, erecting a support beam casting bracket (4): erecting a support beam casting bracket (4) at the bottom of the floor to be cast, and constructing a support plate (41) on the top of the support beam casting bracket (4), so that the limit plate (42) on the top of the support plate (41) corresponds to the position of installing the prefabricated beam shell (2); S4, installing the prefabricated beam shell (2) and the supporting beam shell (3): during installation, first assemble the prefabricated beam shell (2) and the supporting beam shell (3) together, so that the plug-in block (31) of the supporting beam shell (3) is plugged into the plug-in groove (21) of the side wall of the supporting beam, and then the assembled prefabricated beam shell (2) and the supporting beam shell (3) are hoisted onto the supporting plate (41), and then the prefabricated beam shell (2) is clamped into the limiting plate (42), and the plug-in block (31) at the end of the prefabricated beam shell (2) is plugged into the plug-in groove (21) of the transverse keel (12); S5, installing the prefabricated plate (5): placing the prefabricated plate (5) against the supporting step (23), the clamping step (32) and the limiting step (121), and assembling the prefabricated plate (5) with the prefabricated beam shell (2) and the supporting beam shell (3); S6, pouring of the surface layer (7): first pouring concrete into the groove (22) of the precast beam shell (2) and the groove (22) of the support beam shell (3), and finally pouring concrete on the top of the precast beam shell (2), the support beam shell (3) and the precast panel (5) to form the surface layer (7).

7. The construction method of the formwork-free cast-in-place beam structure of an underground assembled station according to claim 6, characterized in that: In S6, before pouring the surface layer (7), the steel pipe (6) is fixed to the top of the precast beam shell (2) through the flange (61).

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