A formwork system and its construction method for beam-beam-column construction

Abstract

A formwork system and construction method for beam-beam-column construction is disclosed, comprising an L-shaped composite formwork, an I-shaped composite formwork, and a filter formwork. The L-shaped and I-shaped composite formworks each include a rubber layer, a panel, reinforcing ribs, and joint reinforcing ribs. The horizontal portion of the L-shaped composite formwork is fixed to the bottom of the beam using expansion bolts, and the vertical portion is fitted to the side surface of the column. The filter formwork includes a first layer of wire mesh, a second layer of wire mesh, reinforcing ribs, and joint reinforcing ribs. Geotextile is sandwiched between the first and second layers of wire mesh, and the reinforcing ribs are welded to the outside of the filter formwork as a reinforcement system. The I-shaped composite formwork is fixed to the side surface of the column using expansion bolts. The L-shaped composite formwork, filter formwork, and I-shaped composite formwork are connected using double-ended bolts. This invention provides a formwork system and construction method for beam-beam-column construction, which can solve the problem of insufficient compaction of the upper and lower concrete pours.

Description

Technical Field

[0001] This invention relates to the field of hydropower station construction, and in particular to a formwork system and construction method for beam-beam-column construction. Background Technology In the construction of large-scale hydropower projects, the main powerhouse and underground powerhouse often involve complex structural design and construction, especially the construction of rock mass support and concrete structures. To ensure the stability of the rock or soil mass, a "beam-first, column-later" construction method is usually adopted. First, pour the superstructure (beams): First, construct the rock-anchored beams (or anchor beams) to fix the beams to the rock or soil, forming a preliminary support structure. This process ensures the load-bearing capacity of the superstructure. Then, pour the substructure (columns): After the beams are constructed, construct the wall-mounted columns or supporting columns to connect the superstructure beams and the substructure foundation, enhancing the overall structural stability. However, using the beam-beam-then-column construction method presents some problems: 1. Insufficient compaction at the joint between the upper and lower concrete sections: Due to the completion of the upper and lower structure pouring, the working space is limited, making it difficult to place concrete into the formwork using conventional methods and to vibrate it effectively. This results in incomplete pouring and insufficient density at the top of the joint. Furthermore, due to the sequential pouring, cold joints are easily formed at the beam-column joint, affecting the overall strength and durability of the structure, and the top of the concrete is not fully poured.

[0002] 2. Poor concrete density: Due to inadequate sealing of the formwork, effective vibration is not possible, resulting in defects such as honeycomb and voids in the concrete, which affects the structural quality.

[0003] 3. Grout loss: During the pouring process, grout may leak from the gaps in the formwork, resulting in material waste and reduced strength. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a formwork system and construction method for beam-beam-column construction, which solves the problem of insufficient compactness of the upper and lower concrete pouring when the beam-beam-column construction method is adopted in the main powerhouse and underground powerhouse of large hydropower stations.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A formwork system for beam-beam-column construction includes an L-shaped composite formwork, an I-shaped composite formwork, and a reverse filter formwork; The horizontal part of the L-shaped composite template is fixed to the bottom of the beam by expansion bolts, and the vertical part of the L-shaped composite template is in contact with the side surface of the column. The vertical part of the type I composite template is fixed to the side surface of the column by expansion bolts; The filter template is located between the L-shaped composite template and the I-shaped composite template and is detachably connected to the L-shaped composite template and the I-shaped composite template to form a whole; The filter template includes a first layer of wire mesh and a second layer of wire mesh, with geotextile sandwiched between the first and second layers of wire mesh, and a reinforcing component provided on the outside of the second layer of wire mesh.

[0006] The L-shaped composite template and I-shaped composite template include a rubber layer, a panel, reinforcing ribs, and connecting ribs; wherein, the panel of the L-shaped composite template includes a horizontal panel and a vertical panel, the horizontal panel and the vertical panel are perpendicular and integrally formed; the rubber layer is fixed on the horizontal panel of the L-shaped composite template, and the rubber layer is attached to the bottom of the beam; the panel of the I-shaped composite template is arranged vertically and the rubber layer is fixed on the panel, and the rubber layer is attached to the side surface of the column.

[0007] The panel, reinforcing ribs, and connecting ribs are all made of Q235 steel plates and welded perpendicularly to each other, with a steel plate thickness between 2mm and 3mm.

[0008] The filter template is located in the gap between the beam and the column.

[0009] Both the first and second layers of wire mesh are made of welded steel wire with a diameter between 5 mm and 7 mm.

[0010] The geotextile is a polyester filament nonwoven fabric.

[0011] The L-shaped composite template, the reverse filter template, and the I-shaped composite template are all connected by double-headed bolts, and the outer side of the reinforcing ribs of the connection part is evenly covered with a rubber layer.

[0012] The vertical length of the L-shaped composite template is less than the gap between the column and the beam.

[0013] A method for constructing a formwork system for beam-beam-column construction involves using self-compacting concrete for the initial pour, utilizing its high fluidity to achieve compaction without vibration; simultaneously, a filter formwork is used to remove excess water and air from the concrete; after initial setting, micro-expansion cement grout is injected into the gap between the bottom of the beam and the top of the column to ensure the grout fills the gap and further improves compactness; and continuous water curing is carried out after the initial setting of the concrete.

[0014] A method for constructing a formwork system for beam-beam-column pre-construction includes the following steps: Step 1: Install the L-shaped composite formwork at the intersection of the beam bottom and column top, and fix it to the beam with expansion bolts to ensure the sealing and stability of the formwork; Step 2: Install the filter template at the bottom of the L-shaped composite template and fix it with double-headed bolts to ensure the sealing and stability of the template; Step 3: Install the Type I composite template at the bottom of the reverse filter template, fix it with double-headed bolts, and fix it to the column with expansion bolts to ensure the sealing and stability of the template; Step 4: Use self-compacting concrete for pouring. The concrete is injected into the pouring area by pumping. The high fluidity of the self-compacting concrete achieves good compaction without vibration. Step 5: After the upper concrete has initially set, the high-pressure pump injects micro-expansion cement grout into the gap between the bottom of the beam and the top of the column through the grouting pipe. The grouting pressure is controlled at 0.5-1.0 MPa to ensure that the grout fills the gap. Step 6: Perform routine curing to ensure that the concrete strength meets the design requirements, the filter template has good permeability, and after final setting, perform continuous water curing to ensure quality.

[0015] This invention provides a formwork system and construction method for beam-beam-column construction, which has the following technical advantages: 1) The two layers of wire mesh and geotextile work together to allow water and air to pass through during the concrete pouring process between beams and columns, while also preventing grout leakage. This effectively prevents grout loss, avoids cold joints and grout leakage, ensures the compactness of the beam-column intersection, and improves construction quality.

[0016] 2) The filter template has excellent sealing properties while also being breathable and permeable. Under pressure, it can appropriately expel excess moisture and air from the concrete, thereby ensuring good sealing and significantly improving the density of the concrete.

[0017] 3) For the initial pouring, self-compacting concrete is used to achieve good compaction without vibration due to its high fluidity. After initial setting, a high-pressure pump is used to inject micro-expansion cement slurry into the gap between the bottom of the beam and the top of the column to ensure that the slurry fills the gap and further improves the compaction.

[0018] 4) The rubber sheeting attached to the composite template and the rib at the template joint is 5mm thick, which can effectively play a role in sealing and elastic compensation, and prevent grout leakage during the pouring process.

[0019] 5) The excellent permeability of the filter template allows for continuous water curing after the initial setting of the concrete, promoting uniform hydration and strength development of the concrete, and further improving the quality of the concrete. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a longitudinal sectional front view of the present invention.

[0021] Figure 2 for Figure 1 A partial schematic diagram.

[0022] Figure 3This is a longitudinal sectional side view of the present invention.

[0023] Figure 4 for Figure 3 A partial schematic diagram.

[0024] Figure 5 This is a schematic diagram of the L-shaped composite template in this invention.

[0025] Figure 6 This is a schematic diagram of the Type I composite template in this invention.

[0026] Figure 7 This is a schematic diagram of the reverse filter template in this invention.

[0027] Figure 8 This is a flowchart of the construction process of the present invention.

[0028] In the diagram: L-shaped composite template 101, I-shaped composite template 102, filter template 103, rubber layer 104, panel 105, reinforcing rib 106, connecting rib 107, beam 108, column 109, first layer wire mesh 110, second layer wire mesh 111, geotextile 112, double-ended bolt 113, expansion bolt 114, grouting pipe 115. Detailed Implementation like Figure 1 , 2 As shown, a formwork system for beam-beam-column construction includes an L-shaped composite formwork 101, an I-shaped composite formwork 102, and a filter formwork 103. like Figures 5-6 As shown, both the L-shaped composite template 101 and the I-shaped composite template 102 include a rubber layer 104, a panel 105, a reinforcing rib 106, and a connecting rib 107.

[0029] Among them, the L-shaped composite template 101 is L-shaped in general, and the panel 105 of the L-shaped composite template 101 includes a horizontal panel and a vertical panel, which are perpendicular to each other and integrally formed.

[0030] The horizontal panel of the L-shaped composite template 101 is fixed to the bottom of the beam 108 by expansion bolts 114 and a rubber layer 104 is provided at the connection. The vertical panel of the L-shaped composite template 101 is attached to the side surface of the column 109.

[0031] The reinforcing ribs 106 of the L-shaped composite template 101 are arranged on the back of the panel 105 and perpendicular to the panel 105, serving a reinforcing function. The connecting ribs 107 of the L-shaped composite template 101 are perpendicular to both the panel 105 and the reinforcing ribs 106. The connecting rib 107 located at the bottom of the panel 105 is horizontal and has holes, facilitating connection to the filter template 103 via double-ended bolts 113, and a rubber layer 104 is provided at the connection point.

[0032] The cross-section of the type I composite template 102 is U-shaped. The vertical panel of the type I composite template 102 is fixed to the side surface of the column 109 by expansion bolts 114, and a rubber layer 104 is provided at the connection. The horizontal panel at the upper end of the type I composite template 102 is connected to the reverse filter template 103, and a rubber layer 104 is provided at the connection.

[0033] The filter template 103 includes a first layer of wire mesh 110 and a second layer of wire mesh 111, with geotextile 112 sandwiched between the first layer of wire mesh 110 and the second layer of wire mesh 111. A reinforcing assembly consisting of reinforcing ribs 106 and connecting ribs 107 is arranged on the outside of the second layer of wire mesh 111. The reinforcing ribs 106 and connecting ribs 107 of the filter template 103 are perpendicular to each other and welded together as a whole, and are arranged on the outside of the second layer of wire mesh 111 as a reinforcing assembly to ensure the rigidity of the filter template 103.

[0034] The reinforcing rib 106 and the connecting rib 107 are both perpendicular to the second layer of wire mesh 111, so as not to affect the air permeability of the first layer of wire mesh 110 and the second layer of wire mesh 111.

[0035] The L-shaped composite template 101, I-shaped composite template 102, and reverse filter template 103 are connected to each other by double-headed bolts 113, and rubber layers 104 are evenly distributed on the outer side of the connecting rib plate 107.

[0036] The panel 105, reinforcing rib 106 and connecting rib 107 are all made of Q235 steel plate with a thickness between 2mm and 3mm.

[0037] Both the first layer of wire mesh 110 and the second layer of wire mesh 111 are made of steel wire welded into a mesh, with the wire diameter between 5mm and 7mm and the mesh size being 50mm × 50mm.

[0038] The geotextile 112 is a 300g / ㎡ polyester filament nonwoven fabric.

[0039] The vertical length of the L-shaped composite template 101 is less than the gap between the beam 108 and the column 109.

[0040] like Figure 3 As shown, a method for beam-beam-column construction includes the following steps: Step 1: Installation of L-shaped composite formwork The L-shaped composite formwork 101 is installed at the intersection of the bottom of the beam 108 and the top of the column 109, and is fixed to the beam 108 with expansion bolts 114 to ensure the sealing and stability of the L-shaped composite formwork 101. Step 2: Install the reverse filter template The filter template 103 is installed at the bottom of the L-shaped composite template 101 and fixed with double-headed bolts 113 to ensure the sealing and stability of the filter template 103; Step 3: Installation of Type I Composite Template The type I composite template 102 is installed at the bottom of the filter template 103 and fixed with double-headed bolts 113 and expansion bolts 114 to the column 109 to ensure the sealing and stability of the template. Step 4: Concrete pouring Self-compacting concrete is used for pouring. The concrete is injected into the pouring area by pumping. The high fluidity of the self-compacting concrete achieves good compaction without vibration. Step 5: Secondary grouting After the upper concrete has initially set, micro-expansion cement grout is injected into the gap between the bottom of the beam and the top of the column using a high-pressure pump through grouting pipe 115. The grouting pressure is controlled at 0.5 to 1.0 MPa to ensure that the grout fills the gap and further improves the compactness. Step 6: Concrete Curing Perform routine curing to ensure that the concrete strength meets the design requirements. The filter template has good permeability and can be cured with running water after final setting to ensure quality.

Claims

1. A formwork system for beam-beam-column construction, characterized in that: Including L-type composite template (101), I-type composite template (102), and reverse filter template (103); The horizontal part of the L-shaped composite template (101) is fixed to the bottom of the beam (108) by expansion bolts (114), and the vertical part of the L-shaped composite template (101) is attached to the side surface of the column (109). The vertical part of the type I composite template (102) is fixed to the side surface of the column (109) by expansion bolts (114); The filter template (103) is located between the L-shaped composite template (101) and the I-shaped composite template (102) and is detachably connected to the L-shaped composite template (101) and the I-shaped composite template (102) to form a whole; The filter template (103) includes a first layer of wire mesh (110) and a second layer of wire mesh (111). Geotextile (112) is sandwiched between the first layer of wire mesh (110) and the second layer of wire mesh (111). A reinforcing component is provided on the outside of the second layer of wire mesh (111).

2. The formwork system for beam-beam-column construction according to claim 1, characterized in that: The L-shaped composite template (101) and I-shaped composite template (102) include a rubber layer (104), a panel (105), a reinforcing rib (106), and a connecting rib (107); wherein, the panel (105) of the L-shaped composite template (101) includes a horizontal panel and a vertical panel, the horizontal panel and the vertical panel are perpendicular and integrally formed; the rubber layer (104) is fixed on the horizontal panel of the L-shaped composite template (101), and the rubber layer (104) is attached to the bottom of the beam (108); the panel (105) of the I-shaped composite template (102) is arranged vertically and the rubber layer (104) is fixed on the panel (105), and the rubber layer (104) is attached to the side surface of the column (109).

3. A formwork system for beam-beam-column construction according to claim 2, characterized in that: The panel (105), reinforcing rib (106) and connecting rib (107) are all made of Q235 steel plate and welded perpendicularly to each other, with a steel plate thickness between 2mm and 3mm.

4. A formwork system for beam-beam-column construction according to claim 3, characterized in that: The filter template (103) is located in the gap between the beam (108) and the column (109).

5. A formwork system for beam-beam-column construction according to claim 4, characterized in that: Both the first layer of wire mesh (110) and the second layer of wire mesh (111) are made of steel wire welded into a mesh, with the diameter of the steel wire between 5 mm and 7 mm.

6. A formwork system for beam-beam-column construction according to claim 5, characterized in that: The geotextile (112) is a polyester filament nonwoven fabric.

7. A formwork system for beam-beam-column construction according to claim 6, characterized in that: The L-shaped composite template (101), the filter template (103), and the I-shaped composite template (102) are all connected by double-headed bolts (113), and the connecting ribs (107) of the connecting part are evenly distributed with rubber layers (104) on the outside.

8. A formwork system for beam-beam-column construction according to claim 7, characterized in that: The vertical length of the L-shaped composite template (101) is less than the gap between the beam (108) and the column (109).

9. A method for constructing a formwork system for beam-beam-column construction according to claim 8, characterized in that: During the initial pouring, self-compacting concrete is used to achieve compaction without vibration by utilizing the high fluidity of self-compacting concrete. At the same time, the filter template (103) is used to remove excess water and air from the concrete. After initial setting, micro-expansion cement slurry is injected into the gap between the bottom of the beam and the top of the column to ensure that the slurry fills the gap and further improves the compactness. Meanwhile, after the initial setting of the concrete, continuous water curing is carried out.

10. A method for constructing a formwork system for beam-beam-column construction according to claim 9, comprising the following steps: Step 1: Install the L-shaped composite formwork (101) at the intersection of the bottom of the beam and the top of the column, and fix it to the beam (108) with expansion bolts (114) to ensure the sealing and stability of the formwork; Step 2: Install the reverse filter template (103) at the bottom of the L-shaped composite template (101) and fix it with double-headed bolts (113) to ensure the sealing and stability of the template; Step 3: Install the type I composite template (102) at the bottom of the filter template (103), fix it with double-headed bolts (113), and fix it with expansion bolts (114) to the column (109) to ensure the sealing and stability of the template; Step 4: Use self-compacting concrete for pouring. The concrete is injected into the pouring area by pumping. The high fluidity of the self-compacting concrete achieves good compaction without vibration. Step 5: After the upper concrete has initially set, the high-pressure pump injects micro-expansion cement grout into the gap between the bottom of the beam and the top of the column through the grouting pipe (115). The grouting pressure is controlled at 0.5 to 1.0 MPa to ensure that the grout fills the gap. Step 6: Perform routine curing to ensure that the concrete strength meets the design requirements, the filter template has good permeability, and after final setting, perform continuous water curing to ensure quality.

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