Formwork system for first-beam and second-column construction and construction method of formwork system

Abstract

The invention discloses a formwork system for first-beam and second-column construction and a construction method of the formwork system. The formwork system comprises an L-shaped composite formwork, an I-shaped composite formwork and an inverted filter formwork. Each of the L-shaped composite templates and the I-shaped composite templates comprises a rubber layer, a panel, a reinforcing rib plate and a joint reinforcing rib plate; the horizontal part of the L-shaped composite formwork is fixed to the bottom of the beam through an expansion bolt, and the vertical part of the L-shaped composite formwork is attached to the side surface of the column. The inverted filter template comprises a first layer of silk screen, a second layer of silk screen, a reinforcing rib plate and a joint reinforcing rib plate, geotechnical cloth is clamped between the first layer of silk screen and the second layer of silk screen, and the reinforcing rib plate serves as a reinforcing system to be welded to the outer side of the inverted filter template; the I-shaped composite template is fixed on the side surface of the column through an expansion bolt; the L-shaped composite formwork, the inverted filter formwork and the I-shaped composite formwork are connected through studs. According to the formwork system for construction of the first beam and the second column and the construction method of the formwork system, the problem that the pouring compactness of concrete on the upper portion and the lower portion is insufficient can be solved.

Description

Technical Field

[0001] The present invention relates to the field of hydropower station engineering construction, and particularly to a formwork system for beam-first and column-later construction and its construction method. Background Art In the construction of large-scale hydropower station projects, the main powerhouse and underground powerhouse often involve complex structural designs and constructions, especially the construction of rock mass support and concrete structures. To ensure the stability of the rock mass or soil mass, the "beam-first and column-later" construction method is usually adopted: Pour the upper structure (beam) first: First, construct the rock-anchored beam (or bolted beam) and fix the beam to the rock mass or soil mass to form a preliminary support structure. This process ensures the bearing capacity of the upper structure. Then pour the lower structure (column): After the beam construction is completed, construct the wall-attached column or support column to connect the upper beam and the lower foundation, enhancing the overall structural stability. However, when using the beam-first and column-later construction method, there are some problems: 1. Insufficient compactness at the joint of the upper and lower concrete: Since the upper and lower structures have been poured, the working space is limited, making it difficult to place the concrete by conventional means and difficult to vibrate, resulting in an unfilled top at the joint and insufficient density. Also, due to the sequential pouring, cold joints are likely to form at the beam-column joint, affecting the overall strength and durability of the structure, and the top is not fully filled.

[0002] 2. Poor concrete compactness: Due to poor sealing of the formwork and ineffective vibration, defects such as honeycombing and holes appear in the concrete, affecting the structural quality.

[0003] 3. Loss of slurry: During the pouring process, the slurry may leak from the formwork gaps, resulting in material waste and a decrease in strength. Summary of the Invention

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

[0005] To solve the above technical problem, the technical solution adopted by the present invention is: A formwork system for beam-first and column-later construction includes an L-shaped composite formwork, an I-shaped composite formwork, and an anti-filtration formwork; The horizontal part of the L-shaped composite formwork is fixed to the bottom of the beam by expansion bolts, and the vertical part of the L-shaped composite formwork is attached to the side surface of the column; The vertical part of the I-shaped composite formwork is fixed to the side surface of the column by expansion bolts; The anti-filtration formwork is located between the L-shaped composite formwork and the I-shaped composite formwork and is detachably connected to the L-shaped composite formwork and the I-shaped composite formwork to form an integral body; The filter template includes a first-layer wire mesh and a second-layer wire mesh. A geotextile is clamped between the first-layer wire mesh and the second-layer wire mesh, and a reinforcement component is arranged outside the second-layer wire mesh.

[0006] The L-shaped composite formwork and the I-shaped composite formwork include a rubber layer, a panel, a reinforcing rib plate, and a connecting rib plate. Among them, the panel of the L-shaped composite formwork includes a horizontal panel and a vertical panel, and 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 formwork, and the rubber layer fits against the bottom of the beam. The panel of the I-shaped composite formwork is vertically arranged and the rubber layer is fixed on the panel, and the rubber layer fits against the side surface of the column.

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

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

[0009] Both the first-layer wire mesh and the second-layer wire mesh are welded into a mesh with steel wires, and the diameter of the steel wires is between 5 mm and 7 mm.

[0010] The geotextile is polyester filament non-woven fabric.

[0011] The L-shaped composite formwork, the filter template, and the I-shaped composite formwork are all connected by double-headed bolts, and rubber layers are evenly distributed outside the reinforcing rib plates at the connection parts.

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

[0013] A method for constructing a formwork system for beam-first and column-second construction. During the initial pouring, self-compacting concrete is used for pouring, and the high fluidity of the self-compacting concrete is utilized to achieve densification without vibration. At the same time, the filter template is used to discharge the excess water and air in the concrete. After initial setting, micro-expansion cement slurry is injected into the gap at the joint of the beam bottom and the column top to ensure that the slurry fills the gap and further improves the densification. At the same time, long-term flowing water curing is carried out after the concrete initial setting.

[0014] A method for constructing a formwork system for beam-first and column-second construction includes the following steps: Step 1: Install the L-shaped composite formwork at the intersection of the beam bottom and the 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 formwork and fix it with double-headed bolts to ensure the sealing and stability of the formwork; Step 3: Install the I-shaped composite formwork at the bottom of the 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 formwork; Step 4: Pour with self-compacting concrete. Inject the concrete into the pouring area by pumping method, and use the high fluidity of the self-compacting concrete to achieve good compactness without vibration. Step 5: After the upper concrete begins to set, use a high-pressure pump to inject the slightly expanding cement slurry into the gap at the joint of the beam bottom and the column top through the grouting pipe. Control the grouting pressure at 0.5 - 1.0 MPa to ensure that the slurry fills the gap. Step 6: Conduct conventional curing to ensure that the concrete strength reaches the design requirements. The filter template has good water permeability, and long-term running water curing is carried out after final setting to ensure quality.

[0015] The present invention provides a formwork system and its construction method for beam-first and column-later construction, having the following technical effects: 1) The combined action of two layers of wire mesh and geotextile can permeate water and air during the pouring process of the concrete pouring area between the beam and the column, prevent slurry leakage, effectively prevent slurry loss, avoid the occurrence of cold joints and slurry leakage, ensure the compactness of the beam-column intersection part, and improve the construction quality.

[0016] 2) The filter template has excellent sealing performance, and at the same time has air permeability and water permeability. Under pressure, it can appropriately discharge the excess water and air in the concrete, thereby ensuring good sealing performance and significantly improving the compactness of the concrete.

[0017] 3) During the initial pouring, self-compacting concrete is used for pouring, and the high fluidity of the self-compacting concrete is used to achieve good compactness without vibration; after initial setting, a high-pressure pump is used to inject slightly expanding cement slurry into the gap at the joint of the beam bottom and the column top to ensure that the slurry fills the gap and further improves the compactness.

[0018] 4) The thickness of the rubber rubber sheet attached to the rib plate at the formwork joint position of the composite formwork is 5 mm, which can effectively play a role in sealing and elastic compensation, and prevent slurry leakage during the pouring process.

[0019] 5) The excellent water permeability of the filter template can carry out long-term running water curing after the concrete begins to set, promote the uniform hydration and strength development of the concrete, and further improve the concrete quality. Description of the Drawings

[0020] The following further illustrates the present invention in conjunction with the drawings and embodiments: Figure 1 It is a longitudinal sectional front view schematic diagram of the present invention.

[0021] Figure 2 It is Figure 1 a partial schematic diagram of

[0022] Figure 3Longitudinal sectional side view schematic diagram of the present invention.

[0023] Figure 4 is Figure 3 partial schematic diagram of.

[0024] Figure 5 Schematic diagram of the L-shaped composite formwork in the present invention.

[0025] Figure 6 Schematic diagram of the I-shaped composite formwork in the present invention.

[0026] Figure 7 Schematic diagram of the filter template in the present invention.

[0027] Figure 8 Construction process flow chart of the present invention.

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

[0029] Among them, the L-shaped composite formwork 101 is integrally L-shaped. The panel 105 of the L-shaped composite formwork 101 includes a horizontal panel and a vertical panel, and the horizontal panel and the vertical panel are perpendicular and integrally formed.

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

[0031] The reinforcing rib plates 106 of the L-shaped composite formwork 101 are arranged on the back of the panel 105 and are perpendicular to the panel 105, playing a strengthening role. The connecting rib plates 107 of the L-shaped composite formwork 101 are perpendicular to both the panel 105 and the reinforcing rib plates 106. The connecting rib plate 107 at the bottommost end of the panel 105 is horizontal and has openings, facilitating connection to the filter template 103 through double-headed bolts 113, and a rubber layer 104 is provided at the connection.

[0032] The cross-section of the I-shaped composite formwork 102 is U-shaped. The vertical panel of the I-shaped composite formwork 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 I-shaped composite formwork 102 is connected to the filter template 103, and a rubber layer 104 is provided at the connection.

[0033] The filter template 103 includes a first-layer wire mesh 110 and a second-layer wire mesh 111. A geotextile 112 is clamped between the first-layer wire mesh 110 and the second-layer wire mesh 111. On the outer side of the second-layer wire mesh 111, a reinforcement assembly composed of reinforcing rib plates 106 and connecting rib plates 107 is arranged. The reinforcing rib plates 106 and connecting rib plates 107 of the filter template 103 are perpendicular to each other and welded into one body, and are arranged on the outer side of the second-layer wire mesh 111 as a reinforcement assembly to ensure the stiffness of the filter template 103.

[0034] Both the reinforcing rib plates 106 and the connecting rib plates 107 are perpendicular to the second-layer wire mesh 111, without affecting the air permeability of the first-layer wire mesh 110 and the second-layer wire mesh 111.

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

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

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

[0038] The geotextile 112 is 300 g / ㎡ polyester filament non-woven fabric.

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

[0040] As Figure 3 shown, a construction method for beam first and column later includes the following steps: Step 1: Installation of L-shaped composite formwork Install the L-shaped composite formwork 101 at the intersection of the bottom of the beam 108 and the top of the column 109, and fix it to the beam 108 with expansion bolts 114 to ensure the sealing and stability of the L-shaped composite formwork 101; Step 2: Installation of filter template Install the filter template 103 at the bottom of the L-shaped composite template 101 and fix it with the double-headed bolts 113 to ensure the tightness and stability of the filter template 103; Step 3: Installation of the I-shaped composite template Install the I-shaped composite template 102 at the bottom of the filter template 103, fix it with the double-headed bolts 113, and fix it with the expansion bolts 114 to the column 109 to ensure the tightness and stability of the template; Step 4: Concrete pouring Use self-compacting concrete for pouring. Inject the concrete into the pouring area by pumping method, and use the high fluidity of the self-compacting concrete to achieve good compactness without vibration; Step 5: Secondary grouting After the upper concrete begins to set, inject the slightly expanding cement slurry into the gap between the bottom of the beam and the top of the column through the grouting pipe 116 by using a high-pressure pump. The grouting pressure is controlled at 0.5 - 1.0 MPa to ensure that the slurry fills the gap and further improves the compactness; Step 6: Concrete curing Conduct routine curing to ensure that the concrete strength reaches the design requirements and the filter template has good water permeability. After final setting, long-term flowing water curing can be carried out to ensure the quality.

Claims

1. A formwork system for the construction of beams first and then columns, characterized in that: It includes an L-shaped composite formwork (101), an I-shaped composite formwork (102), and an anti-filtration formwork (103); The horizontal part of the L-shaped composite formwork (101) is fixed to the bottom of the beam (108) by expansion bolts (114), and the vertical part of the L-shaped composite formwork (101) is attached to the side surface of the column (109); The vertical part of the I-shaped composite formwork (102) is fixed to the side surface of the column (109) by expansion bolts (114); The anti-filtration formwork (103) is located between the L-shaped composite formwork (101) and the I-shaped composite formwork (102) and is detachably connected to the L-shaped composite formwork (101) and the I-shaped composite formwork (102) to form an integral body; The anti-filtration formwork (103) includes a first-layer wire mesh (110) and a second-layer wire mesh (111). A geotextile (112) is clamped between the first-layer wire mesh (110) and the second-layer wire mesh (111), and a reinforcement assembly is arranged outside the second-layer wire mesh (111).

2. The formwork system for beam-first and column-second construction according to claim 1, wherein: The L-shaped composite formwork (101) and the I-shaped composite formwork (102) include a rubber layer (104), a panel (105), a reinforcing rib plate (106), and a connecting rib plate (107); among them, the panel (105) of the L-shaped composite formwork (101) includes a horizontal panel and a vertical panel, and 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 formwork (101), and the rubber layer (104) is attached to the bottom of the beam (108); the panel (105) of the I-shaped composite formwork (102) is vertically arranged 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. The formwork system for beam-first and column-second construction according to claim 2, characterized in that: The panel (105), the reinforcing rib plate (106), and the connecting rib plate (107) are all made of Q235 steel plates and are perpendicularly welded to each other, and the thickness of the steel plates is between 2 mm and 3 mm.

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

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

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

7. A formwork system for beam-first and column-later construction according to claim 6, characterized in that: The L-shaped composite formwork (101), the anti-filtration formwork (103), and the I-shaped composite formwork (102) are all connected by double-headed bolts (113), and rubber layers (104) are evenly distributed outside the reinforcing rib plates (107) at the connection parts.

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

9. A method for constructing using the formwork system for beam-first and column-later construction according to claim 8, characterized in that: During the initial pouring, self-compacting concrete is used for pouring, and the high fluidity of the self-compacting concrete is used to achieve compaction without vibration; at the same time, the anti-filtration formwork (103) is used to discharge the excess water and air in the concrete; after initial setting, micro-expansion cement slurry is injected into the gap at the joint of the beam bottom and the column top to ensure that the slurry fills the gap and further improves the compactness; at the same time, long-flowing water curing is carried out after the concrete initial sets.

10. A method for constructing using the formwork system for beam-first and column-later 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 tightness and stability of the formwork; Step 2: Install the filter template (103) at the bottom of the L-shaped composite formwork (101), and fix it with double-headed bolts (113) to ensure the tightness and stability of the formwork; Step 3: Install the I-shaped composite formwork (102) at the bottom of the filter template (103), fix it with double-headed bolts (113), and fix it to the column (109) with expansion bolts (114) to ensure the tightness and stability of the formwork; Step 4: Pour the self-compacting concrete, inject the concrete into the pouring area by pumping, and use the high fluidity of the self-compacting concrete to achieve good compactness without vibration; Step 5: After the upper concrete begins to set, use a high-pressure pump to inject the slightly expanding cement slurry into the gap at the joint of the bottom of the beam and the top of the column through the grouting pipe (116), and control the grouting pressure at 0.5 - 1.0 MPa to ensure that the slurry fills the gap; Step 6: Conduct routine curing to ensure that the concrete strength reaches the design requirements, and the good water permeability of the filter template. After final setting, conduct long-term running water curing to ensure the quality.

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