High-low span inverted triangular area formwork supporting system and building construction method

Abstract

The invention discloses a high-low span inverted triangular area formwork supporting system and a building construction method. The formwork supporting system comprises valve plate area reinforcing steel bars, inverted triangular area reinforcing steel bars, side wall area reinforcing steel bars, inverted triangular area single-side formworks, side wall area opposite-side formworks and inner side supporting frames. The building construction method comprises the following steps that valve plate area steel bars, inverted triangle area steel bars and side wall area steel bars are constructed; an inner side supporting frame is installed; constructing a single-side template of the inverted triangular area and an opposite-side template of the side wall area; concrete is poured in the valve plate area; and meanwhile, concrete is poured in the side wall area and the inverted triangular area. The construction method has the beneficial effects that a supporting system is complex to build, reasonable planning needs to be made in advance, the problem of construction joints caused by intermittent construction is avoided, and the construction method is practical and can be rapidly and integrally formed at a time especially in the project that construction joints are not allowed to be reserved due to the design requirement that overall pouring is conducted, so that the construction efficiency is improved. The appearance quality of the whole underground structure concrete is guaranteed, and the adaptability is high.

Description

Technical Field

[0001] The present application belongs to the field of building construction technology, and specifically relates to a high-low span inverted triangle area formwork support system and a construction method. Background Art

[0002] During the construction of underground building projects, there are often high and low span areas. For high and low span areas with large height differences, the "inverted triangle" concrete casting formwork support becomes a problem in on-site construction. During on-site construction, sometimes there are single-side walls and high and low span "inverted triangle" large-volume concrete raft slabs in the span direction of the structure. At this time, the traditional construction method is to cast the wall on one side first, and then support the "inverted triangle" high and low span area raft formwork after the wall concrete strength reaches the design requirements, and use the cast side wall to set the top support rod to ensure the stability of the "inverted triangle" casting area formwork support.

[0003] When the construction period is tight and the construction environment is complex, the traditional construction method cannot meet the on-site needs. In addition, the method of using the cast single-sided wall to set up top support rods to stabilize the "inverted triangle" area formwork system has many disadvantages. The force on the single-sided concrete may cause the concrete in the cast guide wall to be damaged, and even worse, cracks may occur. Summary of the invention

[0004] In order to ensure the progress of on-site construction and the overall one-time forming quality of concrete, and improve on-site construction efficiency, this application has formed a high-low span inverted triangle area formwork support system and construction method based on the actual situation on site to solve the problem of concrete construction in high-low span parts of underground projects.

[0005] The purpose of this application is achieved through the following technical solutions:

[0006] A high-low span inverted triangle area formwork support system includes valve plate area steel bars at the bottom of a foundation pit, the two sides of the valve plate area steel bars are respectively connected to the inverted triangle area steel bars and the side wall area steel bars, an inverted triangle area single-side formwork is provided on the inner side of the inverted triangle area steel bars, and a side wall area opposite-side formwork is provided on the inner and outer sides of the side wall area steel bars, an inner support frame is provided on the valve plate area steel bars, and the inner support frame is supported between the inverted triangle area single-side formwork and the side wall area opposite-side formwork.

[0007] Furthermore, an anti-floating tie rod is provided between the valve plate area steel bar and the inverted triangle area single-side formwork. The top of the inverted triangle area single-side formwork is connected to the outer boss formwork through a tie screw.

[0008] Furthermore, an outer support frame is provided between the opposite side formwork of the side wall area and the anchoring steel bars of the side wall of the foundation pit wall, and the opposite side formworks of the inner and outer side wall areas are connected by tension screws.

[0009] Furthermore, a counterweight platform is provided on one side of the inner support frame close to the single-side template of the inverted triangle area, and a counterweight object is provided on the counterweight platform.

[0010] Furthermore, the frame ends of the inner support frame and / or the outer support frame are provided with adjustable top supports.

[0011] Furthermore, a leg pad is provided on the bottom of the foundation pit, and a steel leg is provided on the leg pad. The steel leg is respectively connected to the valve plate surface reinforcement and the valve plate bottom reinforcement. The steel leg is inserted into the support upright of the inner support frame, and the steel leg is provided with a leg transverse reinforcement supporting the support upright.

[0012] A construction method for a high-low span inverted triangle area comprises the following steps:

[0013] Step 1, constructing valve plate area steel bars at the bottom of the foundation pit, and constructing inverted triangle area steel bars and side wall area steel bars on both sides of the valve plate area steel bars;

[0014] Step 2, installing the inner support frame on the steel bars in the valve plate area;

[0015] Step 3, constructing a single-side formwork for the inverted triangle area on the inner side of the steel bars in the inverted triangle area, constructing an opposite-side formwork for the side wall area on the inner and outer sides of the steel bars in the side wall area, and supporting the single-side formwork for the inverted triangle area and the opposite-side formwork for the side wall area by using an inner support frame and an auxiliary support assembly;

[0016] Step 4, pouring concrete in the valve plate area;

[0017] Step 5: pour concrete in the side wall area and the inverted triangle area at the same time, and pour in layers until the pouring is completed.

[0018] Furthermore, in the step 2, a line is drawn on the bottom of the foundation pit according to the arrangement spacing of the support poles, and a leg pad is placed on the bottom of the foundation pit according to the drawn line. Then, a steel leg is arranged on the leg pad. The steel leg is respectively connected and fixed to the valve plate surface reinforcement and the valve plate bottom reinforcement. The steel leg is connected and fixed to the leg transverse reinforcement above the valve plate protective layer. The support pole is inserted into the steel leg and placed on the leg transverse reinforcement.

[0019] Furthermore, in the step 3, the opposite side formworks of the inner and outer side wall areas are connected and fixed by tension screws, and the anchor steel bars on the side walls of the foundation pit wall support the opposite side formworks of the side wall area through the outer support frame; the single-sided formwork of the inverted triangle area is connected and fixed to the steel bars of the valve plate area by an anti-floating tie rod, and the top of the single-sided formwork of the inverted triangle area is connected to the outer boss formwork by tension screws.

[0020] Furthermore, in the step 3, a counterweight platform is provided on one side of the inner support frame close to the single-side template of the inverted triangle area, and a counterweight object is provided on the counterweight platform.

[0021] Beneficial effects of the present application: The support system of the present application is relatively complex and requires reasonable planning in advance, but it avoids the construction joint problem caused by intermittent construction, especially in projects where the design requires overall casting and no construction joints are allowed. The present application is more practical and can be quickly formed as a whole in one go, ensuring the appearance quality of the concrete of the entire underground structure, and has strong adaptability.

[0022] The aforementioned main scheme of the present application and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection in the present application; and in the present application, (non-conflicting options) can also be freely combined with each other and with other options. After understanding the scheme of the present application, those skilled in the art can understand that there are many combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present application, and they are not exhaustively listed here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of this application.

[0024] Figure 2 It is a structural schematic diagram of the inner support frame of the present application.

[0025] Figure 3 It is a pouring diagram of this application.

[0026] In the figure: 1- pit bottom, 2- pit corner side wall, 3- pit wall side wall, 4- valve plate area steel bars, 5- inverted triangle area steel bars, 6- side wall area steel bars, 7- inner support frame, 8- outer support frame, 9- inverted triangle area single-side formwork, 10- side wall area opposite side formwork, 11- anti-floating tie rod, 12- tension screw, 13- anchor steel bars, 14- counterweight platform, 15- counterweight, 16- leg pads, 17- steel leg, 18- valve plate surface bars, 19- valve plate bottom bars, 20- leg transverse bars, 21- bracket vertical rods, 22- adjustable top supports, 23- boss formwork. DETAILED DESCRIPTION

[0027] The following non-limiting examples are provided to illustrate the present application.

[0028] Embodiment 1:

[0029] refer to Figure 1 to Figure 3 As shown, a high-low span inverted triangle area formwork support system includes a foundation pit bottom 1, foundation pit corner side walls 2, foundation pit wall side walls 3, valve plate area steel bars 4, inverted triangle area steel bars 5, side wall area steel bars 6, inner support frame 7, outer support frame 8, inverted triangle area single-side formwork 9, side wall area opposite side formwork 10, anti-floating tie rods 11, tension screws 12, anchor steel bars 13, counterweight platforms 14, counterweights 15, leg pads 16, steel leg 17, valve plate surface bars 18, valve plate bottom bars 19, leg transverse bars 20, bracket uprights 21, adjustable top supports 22 and boss formwork 23.

[0030] The foundation pit includes a foundation pit bottom 1 and foundation pit corner side walls 2 and foundation pit wall side walls 3 on both sides. The foundation pit bottom 1 is a flat bottom surface or a stepped bottom surface, and the foundation pit corner side walls 2 and foundation pit wall side walls 3 are slope structures. The surface of the foundation pit bottom 1 is a valve plate area and a valve plate area steel bar 4 is provided. The foundation pit corner side wall 2 is close to the inner side as an inverted triangle area and an inverted triangle area steel bar 5 is provided. The foundation pit wall side walls 3 are separated by a distance as a side wall area and a side wall area steel bar 6 is provided.

[0031] The two sides of the valve plate area steel bar 4 are tied and connected with the inverted triangle area steel bar 5 and the side wall area steel bar 6 respectively, and the steel bars of the three parts are tied and connected as one in advance, making the whole more stable and facilitating the subsequent integrated pouring construction.

[0032] The inverted triangle area single-side formwork 9 (15 mm thick) is arranged inside the inverted triangle area reinforcement 5, and the inverted triangle area single-side formwork 9 cooperates with the foundation pit corner side wall 2 to complete the enclosure of the inverted triangle area concrete. The side wall area opposite side formwork 10 (15 mm thick) is arranged inside and outside the side wall area reinforcement 6. Since the inside and outside of the side wall area opposite side formwork 10 are arranged relatively, the side wall area opposite side formwork 10 itself can complete the enclosure of the side wall area concrete.

[0033] An inner support frame 7 is provided on the steel bars 4 in the valve plate area, and the steel bars 4 in the valve plate area are used to realize the placement and fixation of the inner support frame 7. The inner support frame 7 is supported between the single-side formwork 9 in the inverted triangle area and the opposite-side formwork 10 in the (inner) side wall area. The inner support frame 7 forms a force form of supporting on both sides, thus avoiding the imbalance problem caused by single-side force in traditional construction.

[0034] An anti-floating tie rod 11 is provided between the valve plate area steel bar 4 and the inverted triangle area single-side template 9, and the valve plate area steel bar 4 is used to realize the placement and fixation of the inverted triangle area single-side template 9 to prevent it from floating and tilting. The top of the inverted triangle area single-side template 9 is connected to the outer boss template 23 through a tie screw 12, and the inverted triangle area single-side template 9 is opposite to the boss template 23 to form a boss at the upper part of the inverted triangle area.

[0035] A plurality of anchoring steel bars 13 are obliquely inserted and anchored on the side wall 3 of the foundation pit wall. An outer support frame 8 is provided between the (outer) side wall area opposite side formwork 10 and the anchoring steel bars 13 of the side wall 3 of the foundation pit wall. The outer support frame 8 is supported and fixed by the anchoring steel bars 13, and the outer support frame 8 supports the side wall area opposite side formwork 10. The inner and outer side wall area opposite side formworks 10 are connected by tension screws 12 to achieve relative connection between the side wall area opposite side formworks 10.

[0036] A counterweight platform 14 is provided on one side of the inner support frame 7 near the single-side formwork 9 in the inverted triangle area, and a counterweight 15 is provided on the counterweight platform 14. Specifically, the counterweight platform 14 is a 15mm thick formwork laid on the top of the vertical pole, and a 9m long bundle of steel bars is pressed on the top of the formwork to serve as a weight steel bar when pouring the bottom slab concrete to prevent the frame from floating up.

[0037] The frame ends of the inner support frame 7 and the outer support frame 8 are provided with adjustable top supports 22, which are threaded rotation adjustment methods. The adjustable top supports 22 act on the single-side formwork 9 in the inverted triangle area, the opposite side formwork 10 in the side wall area, the side wall 3 of the foundation pit wall and the counterweight platform 14, which can ensure stable and sufficient support for the formwork and the side wall, and can adjust the center of gravity of the counterweight platform to optimize the anti-floating effect.

[0038] A leg pad 16 is provided on the bottom of the foundation pit 1. The leg pad 16 is a concrete pad used to ensure the thickness of the valve plate protective layer. A steel leg 17 is provided on the leg pad 16. The steel leg 17 is welded to the valve plate surface reinforcement 18 and the valve plate bottom reinforcement 19 respectively to ensure the vertical stability of the steel leg 17. The steel leg 17 is inserted into the support column 21 of the inner support frame 7. The steel leg 17 is provided with a leg transverse reinforcement 20 for supporting the support column 21. The steel leg 17 and the leg transverse reinforcement 20 are used to support the support column 21 together to ensure that the support column 21 does not fall or deflect.

[0039] Example 2

[0040] A construction method for a high-low span inverted triangle area, using the formwork support system of Example 1, comprises the following steps:

[0041] Step 1, apply valve plate area steel bars 4 at the bottom 1 of the foundation pit, apply inverted triangle area steel bars 5 and side wall area steel bars 6 on both sides of the valve plate area steel bars 4, and the two sides of the valve plate area steel bars 4 are tied and connected with the inverted triangle area steel bars 5 and the side wall area steel bars 6 respectively.

[0042] Step 2, install the inner support frame 7 on the valve plate area steel bar 4. First, according to the arrangement spacing of the support poles 21, the pole arrangement spacing is 900*900mm, and the leg pads 16 are placed on the foundation pit bottom 1 according to the elastic line (pole arrangement spacing). The leg pads 16 are 100*100*100mm concrete pads to ensure the thickness of the raft (lower) protective layer.

[0043] Then, a steel support leg 17 is arranged on the support leg pad 16. The steel support leg 17 is welded and fixed to the valve plate surface reinforcement 18 and the valve plate bottom reinforcement 19 respectively. The steel support leg 17 extends upward from the valve plate area. The steel support leg 17 is welded and fixed to the leg transverse reinforcement 20 above the valve plate protective layer. The support vertical pole 21 is inserted into the steel support leg 17 and placed on the support leg transverse reinforcement 20. The steel support leg vertical reinforcement is inserted into the vertical pole by not less than 300 mm to achieve the fixation of the support vertical pole 21 on the steel support leg 17.

[0044] According to the above steps, the support poles 21 are arranged one by one, and then the longitudinal and transverse poles are arranged. The inner support frame 7 is arranged at a spacing of 900*900mm, the horizontal pull rod step is 1500mm, and the bottom and upper parts of the frame are respectively provided with horizontal scissor braces, which are made of φ48.3*3.6mm steel pipes, and the middle overlap length is not less than 1 meter.

[0045] Step 3, construct a 15mm thick single-sided formwork 9 for the inverted triangle area on the inner side of the inverted triangle area steel bar 5, and construct a 15mm thick opposite-side formwork 10 for the side wall area on the inner and outer sides of the side wall area steel bar 6, and use the inner support frame 7 and auxiliary support components to support the single-sided formwork 9 for the inverted triangle area and the opposite-side formwork 10 for the side wall area.

[0046] The opposite side formworks 10 of the inner and outer side wall areas are connected and fixed by three-stage tension screws 12. A number of anchoring steel bars 13 are obliquely inserted and anchored on the side wall 3 of the foundation pit wall. The anchoring steel bars 13 on the side wall 3 of the foundation pit wall support the opposite side formworks 10 of the side wall area through the outer support frame 8. A 25mm diameter steel bar is anchored on the slope of the side wall 3 of the foundation pit wall as the horizontal support anchor end. Steel pipe horizontal supports are added to the symmetrical parts of the outside and inside of the side wall, arranged at a spacing of 900mm, aligned vertically and horizontally, and the inner and outer horizontal supports are arranged on the same horizontal line.

[0047] The single-side formwork 9 of the inverted triangle area is connected and fixed to the valve plate area steel bar 4 through an anti-floating tie rod 11, with a horizontal spacing of 900 mm. The top of the single-side formwork 9 of the inverted triangle area is connected to the outer boss formwork 23 through a tension screw 12.

[0048] The frame ends of the inner support frame 7 and the outer support frame 8 are provided with adjustable top supports 22. The adjustable top supports 22 are threaded rotation adjustment methods. Specifically, a full-length steel pipe is used as a top support support and fixed. The top support is adjusted as a free end. Two steel pipes are placed in the top support as vertical force support for the template. At the same time, 50*100mm square wood is added as a template support beam. The left and right top supports are arranged with a horizontal spacing of 900mm and are vertically and horizontally aligned.

[0049] A counterweight platform 14 is arranged on the inner support frame 7 near the single-side formwork 9 of the inverted triangle area, and a counterweight 15 is arranged on the counterweight platform 14. Specifically, within a span near the inverted triangle raft area, a 15mm thick formwork is laid on the top of the vertical pole, and a 9m long bundle of steel bars is pressed on the upper part of the formwork as a weight steel bar when pouring the bottom slab concrete to prevent the frame from floating up. The counterweight 15 is placed when the side wall pouring starts.

[0050] Step 4, pouring concrete in the valve plate area. This construction method belongs to the one-time forming construction method of the valve plate area, side wall area, and inverted triangle area. The construction sequence should be arranged reasonably during the concrete pouring. First, pour the concrete of the lower valve plate area. When pouring, it is advanced forward in layers and steps according to the requirements of large-volume concrete construction. The pouring thickness of each layer is 300-500mm, and manual vibration is performed at the same time. Due to the dense arrangement of the frame, the bottom plate concrete surface is manually smoothed and polished for the second time.

[0051] Step 5, after the valve plate is cast, concrete is cast in the side wall area and the inverted triangle area at the same time, and the casting is uniform, layered, and segmented, so that the inner support frame 7 in the middle is evenly stressed until the casting is completed. During the casting construction process, pay attention to the stability of the entire frame and the verticality of the side wall at any time, and ensure the continuity of the concrete casting construction until the overall casting is completed.

[0052] The aforementioned basic examples and their further selected examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed for protection in this application. In the scheme of this application, each selected example can be arbitrarily combined with any other basic examples and selected examples.

[0053] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A high-low span inverted triangle area formwork support system, comprising valve plate area steel bars (4) at the bottom of a foundation pit (1), characterized in that: The two sides of the valve plate area steel bar (4) are respectively connected to the inverted triangle area steel bar (5) and the side wall area steel bar (6); an inverted triangle area single-side formwork (9) is provided on the inner side of the inverted triangle area steel bar (5); a side wall area opposite-side formwork (10) is provided on the inner and outer sides of the side wall area steel bar (6); an inner support frame (7) is provided on the valve plate area steel bar (4); and the inner support frame (7) is supported between the inverted triangle area single-side formwork (9) and the side wall area opposite-side formwork (10).

2. The high-low span inverted triangle area formwork support system according to claim 1 is characterized by: An anti-floating tie rod (11) is provided between the valve plate area steel bar (4) and the inverted triangle area single-sided formwork (9); the top of the inverted triangle area single-sided formwork (9) is connected to the outer boss formwork (23) via a tension screw rod (12).

3. The high-low span inverted triangle area formwork support system according to claim 1 is characterized by: An outer support frame (8) is provided between the side wall area opposite side formwork (10) and the anchoring steel bar (13) of the foundation pit wall side wall (3); the inner and outer side wall area opposite side formworks (10) are connected via a tension screw (12).

4. The high-low span inverted triangle area formwork support system according to claim 1 is characterized in that: A counterweight platform (14) is provided on the inner support frame (7) at a side close to the single-side template (9) in the inverted triangle area, and a counterweight object (15) is provided on the counterweight platform (14).

5. The high-low span inverted triangle area formwork support system according to any one of claims 1 to 4, characterized in that: The frame ends of the inner support frame (7) and / or the outer support frame (8) are provided with adjustable top supports (22).

6. The high-low span inverted triangle area formwork support system according to claim 1 is characterized by: The foundation pit bottom (1) is provided with a leg pad (16), the leg pad (16) is provided with a steel leg (17), the steel leg (17) is connected to the valve plate surface reinforcement (18) and the valve plate bottom reinforcement (19) respectively, the steel leg (17) is inserted into the support upright (21) of the inner support frame (7), and the steel leg (17) is provided with a leg transverse reinforcement (20) supporting the support upright (21).

7. A construction method for a high-low span inverted triangle area, characterized in that: The steps include: Step 1, installing valve plate area steel bars (4) at the bottom of the foundation pit (1), and installing inverted triangle area steel bars (5) and side wall area steel bars (6) on both sides of the valve plate area steel bars (4); Step 2, installing an inner support frame (7) on the steel bars (4) in the valve plate area; Step 3, constructing a single-side formwork (9) of the inverted triangle area on the inner side of the inverted triangle area steel bar (5), constructing a side wall area opposite side formwork (10) on the inner and outer sides of the side wall area steel bar (6), and supporting the single-side formwork (9) of the inverted triangle area and the side wall area opposite side formwork (10) by using an inner support frame (7) and an auxiliary support assembly; Step 4, pouring concrete in the valve plate area; Step 5: pour concrete in the side wall area and the inverted triangle area at the same time, and pour in layers until the pouring is completed.

8. The construction method for high-low span inverted triangle area according to claim 7 is characterized by: In the step 2, a line is drawn on the bottom (1) of the foundation pit according to the arrangement spacing of the support poles (21), and a leg pad (16) is placed on the bottom (1) of the foundation pit according to the drawn line, and then a steel leg (17) is arranged on the leg pad (16), and the steel leg (17) is connected and fixed to the valve plate surface reinforcement (18) and the valve plate bottom reinforcement (19) respectively, and the steel leg (17) is connected and fixed to the leg transverse reinforcement (20) above the valve plate protective layer, and the support pole (21) is inserted into the steel leg (17) and placed on the leg transverse reinforcement (20).

9. The construction method for high-low span inverted triangle area according to claim 7 is characterized by: In the step 3, the opposite side formworks (10) of the inner and outer side wall areas are connected and fixed by tension screws (12), and the anchor steel bars (13) on the side wall (3) of the foundation pit wall support the opposite side formworks (10) of the side wall area through the outer support frame (8); the single-side formwork (9) of the inverted triangle area is connected and fixed to the valve plate area steel bars (4) by an anti-floating tie rod (11), and the top of the single-side formwork (9) of the inverted triangle area is connected to the outer boss formwork (23) by a tension screw (12).

10. The construction method for high-low span inverted triangle area according to claim 7 or 9, characterized in that: In the step 3, a counterweight platform (14) is arranged on the inner support frame (7) at a side close to the single-side template (9) in the inverted triangle area, and a counterweight object (15) is arranged on the counterweight platform (14).

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