Construction method of cast-in-situ arc-shaped beam with double-layer wooden formwork

Abstract

The application discloses a kind of double-layer wood formwork cast-in-place arc-shaped beam construction methods, comprising the following steps: S1: prefabricated formwork support;S2: install formwork support, the formwork support is set to two groups along the length direction of arc-shaped beam;S3: lay lower wood formwork, the length direction of each lower wood formwork two ends respectively with corresponding formwork mounting plate of corresponding side formwork support is pasted and fixed;S4: lay upper wood formwork, in step S3 between two adjacent lower wood formwork respectively lay upper wood formwork, the edge of the transverse two ends of the upper wood formwork is respectively fixedly connected with the transverse lateral edge of two lower wood formwork;S5: side formwork installation;S6: pouring, rely on the self-weight of concrete to make upper wood formwork at each inflection point structure natural deformation form smooth arc;Double-layer wood formwork cast-in-place arc-shaped beam construction method provided by the application can facilitate to reduce construction cost, and ensure construction effect to some extent.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and particularly relates to a construction method for a double-layer wooden formwork cast-in-situ curved beam. Background Art

[0002] Currently, cast-in-place curved beam structures in construction typically use custom formwork, such as aluminum or steel formwork. These are relatively expensive and have low utilization rates. Costs can only be reduced by using a large number of standard components. This approach is suitable for residential projects with a large number of standard floors. For public buildings with non-standard floors, such as gymnasiums and libraries, using a large number of standard components and custom formwork significantly increases costs. Therefore, a new cast-in-place curved beam construction method is urgently needed to reduce construction costs while ensuring a certain level of quality. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a double-layer wooden formwork cast-in-place curved beam construction method, which can help reduce construction costs and ensure construction effects to a certain extent.

[0004] To achieve the above object, the present invention provides the following technical solution: a construction method for a double-layer wooden formwork cast-in-place curved beam, comprising the following steps:

[0005] S1: A prefabricated formwork support, comprising a bottom support base and a formwork mounting component disposed on top of the bottom support base, wherein the formwork mounting component comprises a plurality of formwork mounting plates evenly distributed along the arc extension direction of the arc-shaped beam cross section, wherein the plurality of formwork mounting plates are fixedly connected end to end in sequence, and a V-shaped inflection point structure is formed between two adjacent formwork mounting plates;

[0006] S2: Installing the formwork supports, installing the formwork supports obtained in step S1 to the preset points on the construction site, and setting the formwork supports in two groups along the length direction of the curved beam;

[0007] S3: Laying the lower wooden formwork, wherein the number of the lower wooden formwork is the same as the number of the formwork mounting plates, and the two ends of each lower wooden formwork in the length direction are respectively attached and fixed to the corresponding formwork mounting plates of the corresponding side formwork brackets;

[0008] S4: Laying the upper wooden formwork, respectively laying the upper wooden formwork between the two adjacent lower wooden formworks in step S3, and fixing the edges of the upper wooden formwork at both ends to the outer lateral edges of the two lower wooden formworks respectively;

[0009] S5: side formwork installation;

[0010] S6: Pouring, relying on the weight of the concrete to make the upper wooden formwork naturally deform at each inflection point structure to form a smooth arc.

[0011] Furthermore, the prefabrication step of the formwork support in step S1 includes:

[0012] S11: prefabricated curved frame conforming to the curved portion of the cross section of the curved beam to be cast;

[0013] S12: Divide the arc frame obtained in step S11 into multiple segments of equal arc length, and make markings on the outer arc surface of the arc frame;

[0014] S13: Using the line marked in S12 as the alignment line, weld the template mounting plates end to end in sequence to form a template mounting component;

[0015] S14: Make a bottom support seat according to the support strength requirements, and weld the bottom support seat to the bottom of the template installation component.

[0016] Furthermore, the arc-shaped frame is formed by bending a tubular beam.

[0017] Furthermore, the angle between two adjacent template mounting plates ranges from 155 to 170 degrees.

[0018] Furthermore, the thickness of the upper wooden formwork is in the range of 4-8 mm, and the thickness of the upper wooden formwork is smaller than the thickness of the lower wooden formwork.

[0019] Furthermore, the width of the lower wooden formwork ranges from 15 to 30 cm.

[0020] Furthermore, a movable gap is reserved at the joint between two adjacent upper wooden formworks, and the movable gap is sealed by filling with sealant.

[0021] Furthermore, the bottom support seat includes a cross bracing beam and a plurality of upper support columns fixed on the top of the cross bracing beam and corresponding to the plurality of template mounting plates. The top of each upper support column is welded and fixed to the center of the bottom surface of the corresponding template mounting plate.

[0022] Furthermore, a plurality of lower support columns are fixedly provided at the bottom of the cross bracing beam.

[0023] Furthermore, the upper wooden formwork and the lower wooden formwork are fixed by self-tapping screws.

[0024] The beneficial effects of the present invention are as follows:

[0025] The double-layer wooden formwork cast-in-situ curved beam construction method provided by the present invention can help reduce construction costs and ensure construction effects to a certain extent, and is particularly suitable for the construction of non-standard-layer public building projects such as gymnasiums and libraries; specifically, in this construction method, a double-layer wooden formwork is used to cast the curved portion of the curved beam, wherein the lower wooden formwork and the upper wooden formwork are both conventional flat plate structures, and there is no need to customize specific curved aluminum formwork or steel formwork, which greatly reduces the cost investment of customized formwork; at the same time, the formwork bracket in this construction method provides an installation position for the lower wooden formwork, and the set formwork installation component can fit the shape of the curved portion of the curved beam to a certain extent (it can be understood that the more the number of inflection point structures set, the closer it is to the design arc of the curved beam), and the upper wooden formwork set The board slows down the creases, and the weight of the concrete causes the upper wooden formwork to deform naturally at each folding point structure to form a smooth arc, so that the arc beam finally cast has a better molding effect, ensuring the construction quality; at the same time, the formwork support in this construction method not only plays a shaping role, but also serves as a supporting structure for the overall formwork. The supporting structure is stable and reliable, which can effectively reduce the auxiliary reinforcement supports set in other parts, and can be pre-made as a whole, reducing the later support construction and improving construction efficiency; the elevation of the arc beam to be cast can be controlled by controlling the height of the formwork support, and the overall construction is convenient, which is convenient for construction precision control and ensures construction quality; in this construction method, there is no need to equip a large number of customized formworks, and it can be prefabricated on site according to the specific size of the arc beam to be constructed on site.

[0026] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the cross-section of the present invention

[0028] Figure 2 for Figure 1 A partial enlarged view of point A in the middle

[0029] Figure 3 Schematic diagram of the structure of the present invention

[0030] Figure markings: 1- bottom support seat; 101- cross beam; 102- upper support column; 103- lower support column; 2- template installation component; 201- template installation plate; 201a- breaking point structure; 3- lower wooden template; 4- upper wooden template; 4a- sealant; 5- arc frame; 6- self-tapping screw. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] See also Figure 1-3 This embodiment discloses a method for constructing a double-layer wooden formwork cast-in-place curved beam, comprising the following steps:

[0033] S1: Prefabricated formwork support, the formwork support includes a bottom support seat 1 and a formwork installation component 2 arranged on the top of the bottom support seat 1, the formwork installation component 2 includes a plurality of formwork installation plates 201 evenly distributed along the arc extension direction of the arc beam cross section, the head and tail of the plurality of formwork installation plates 201 are fixedly connected in sequence, and a V-shaped inflection point structure 201a is formed between two adjacent formwork installation plates 201. It can be understood that the structure of the bottom support seat 1 here is not limited, and can form a stable support for the formwork installation component 2. Here, the arc The "horizontal" in the cross-section of the curved beam refers to the width direction of the curved beam. The uniform distribution of multiple template mounting plates 201 is conducive to ensuring the appearance effect of the curved beam molding. The specific number of template mounting plates 201 can be determined according to the width of the curved beam. The wider the width of the curved beam, the more template mounting plates 201 are required according to the molding accuracy (it can be understood that the more the number of inflection point structures 201a formed, the closer it is to the designed arc of the curved beam, and the better the molding accuracy or effect). The template mounting component 2 in this structure has good overall strength and good structural reliability.

[0034] S2: Installing formwork supports: Install the formwork supports obtained in step S1 to preset points on the construction site. The formwork supports are arranged in two groups along the length direction of the curved beam. It can be understood that the two groups of installation formwork supports are usually arranged at positions close to the ends of the curved beam in the length direction. The installation formwork supports can generally be fixed to the ground by riveting or other methods;

[0035] S3: Laying the lower wooden formwork 3. The number of the lower wooden formwork 3 is the same as the formwork mounting plates 201. The two ends of each lower wooden formwork 3 in the length direction are respectively attached to and fixed to the corresponding formwork mounting plates 201 of the corresponding side formwork bracket. Here, the lower wooden formwork 3 is fixed to the formwork mounting plates 201 by air nails.

[0036] S4: Laying the upper wooden formwork 4. In step S3, the upper wooden formwork 4 is laid between the two adjacent lower wooden formworks 3. The edges at both ends of the upper wooden formwork 4 are fixedly connected with the outer horizontal edges of the two lower wooden formworks 3 respectively. It can be understood that the horizontal direction of the upper wooden formwork 4 refers to the width direction of the upper wooden formwork 4. Here, the upper wooden formwork 4 and the lower wooden formwork 3 are preferably fixed with self-tapping screws. After the upper wooden formwork 4 and the two adjacent lower wooden formworks 3 are laid, an isosceles triangle structure is formed. The middle part of the upper wooden formwork 4 forms a certain suspended state, which can be deformed under the action of concrete gravity to form a smooth curved surface to ensure the construction effect.

[0037] S5: Installation of side formwork. The installation method of the side formwork, i.e. the side formwork of the upper straight beam part of the curved beam, is the same as that of the existing side formwork, which will not be described here in detail.

[0038] S6: pouring, relying on the deadweight of the concrete to make the upper wooden formwork 4 naturally deform at each inflection point structure 201a to form a smooth arc. The pouring process is consistent with the existing cast-in-place beam construction process and will not be repeated here;

[0039] The above-mentioned double-layer wooden formwork cast-in-situ curved beam construction method can help reduce construction costs and ensure construction effects to a certain extent, and is particularly suitable for the construction of non-standard-layer public building projects such as gymnasiums and libraries; specifically, in this construction method, a double-layer wooden formwork is used to cast the curved portion of the curved beam, wherein the lower wooden formwork 3 and the upper wooden formwork 4 are both conventional flat plate structures, and there is no need to customize specific curved aluminum formwork or steel formwork, which greatly reduces the cost investment of customized formwork; at the same time, the formwork bracket in this construction method provides an installation position for the lower wooden formwork 3, and the set formwork installation component 2 can fit the shape of the curved portion of the curved beam to a certain extent (it can be understood that the more the number of inflection point structures set, the closer it is to the design arc of the curved beam), and the upper wooden formwork 4 set To reduce creases, the weight of the concrete causes the upper wooden formwork 4 to deform naturally at each inflection point structure 201a to form a smooth arc, so that the arc beam finally cast has a better molding effect, ensuring the construction quality; at the same time, the formwork support in this construction method not only plays a shaping role, but also serves as a supporting structure for the entire formwork. The supporting structure is stable and reliable, which can effectively reduce the auxiliary reinforcement supports set in other parts, and can be pre-made as a whole, reducing the later support construction and improving construction efficiency; the elevation of the arc beam to be cast can be controlled by controlling the height of the formwork support, and the overall construction is convenient, which facilitates the control of construction accuracy and ensures the construction quality; in this construction method, there is no need to equip a large number of customized formworks, and they can be prefabricated on site according to the specific size of the arc beam to be constructed on site.

[0040] In this embodiment, the prefabrication step of the formwork support in step S1 includes:

[0041] S11: prefabricate an arc frame 5 that conforms to the arc portion of the cross section of the arc beam to be cast;

[0042] S12: dividing the arc frame 5 obtained in step S11 into multiple segments of equal arc length, and marking the outer arc surface 5a of the arc frame 5;

[0043] S13: Using the line marks in S12 as alignment lines, weld the template mounting plates 201 end to end in sequence to form the template mounting component 2. Specifically, place one end of the template mounting plate 201 against the line marks, and use the line marks as a reference to quickly complete the production of the template mounting component 2.

[0044] S14: Make a bottom support base 1 according to the support strength requirements, and weld the bottom support base 1 to the bottom of the template mounting component 2;

[0045] In the method for manufacturing the formwork support, the provision of the arc frame 5 can effectively ensure the manufacturing quality of the formwork mounting component 2, while having high construction efficiency, and can be manufactured on-site according to specific construction dimensions.

[0046] In this embodiment, the arc frame 5 is formed by bending a pipe beam, which has a simple structure and is easy to manufacture.

[0047] In this embodiment, the angle between the two adjacent template installation plates 201 ranges from 155 to 170 degrees. Within this angle range, the upper wooden template 4 is better deformed after installation, and the arc beam forming effect is better.

[0048] In this embodiment, the thickness range of the upper wooden formwork 4 is 4-8 mm, and the thickness of the upper wooden formwork 4 is less than the thickness of the lower wooden formwork 3. In this design, the lower wooden formwork 3 can play a good supporting and limiting role, the upper wooden formwork 4 has a good deformation effect, and the arc beam forming effect is good.

[0049] In this embodiment, the width of the lower wooden formwork 3 ranges from 15 to 30 cm. Within this width range, the deformation effect of the upper wooden formwork 4 is good and the arc beam forming effect is good.

[0050] In this embodiment, a movable gap is reserved at the joint between the two adjacent upper wooden formworks 4, and the movable gap is sealed by filling with sealant 4a; by setting the movable gap, the adaptive deformation of the upper wooden formwork 4 is facilitated, the deformation effect of the upper wooden formwork 4 is good, and the arc beam forming effect is good; by filling with sealant 4a for sealing, leakage of slurry can be avoided to affect the appearance of the arc beam.

[0051] In this embodiment, the bottom support seat 1 includes a cross-bracing beam 101 and a plurality of upper support columns 102 fixed on the top of the cross-bracing beam 101 and corresponding to a plurality of template mounting plates 201. The top of each upper support column 102 is welded and fixed to the center of the bottom surface of the corresponding template mounting plate 201; the bottom support seat 1 in this structural design has a simple structure, good supporting strength, and a reliable structure, which is conducive to improving construction safety, reducing deformation of the template mounting component 2, and further ensuring the construction and molding quality of the curved beam.

[0052] In this embodiment, a plurality of lower support columns 103 are fixedly provided at the bottom of the cross bracing beam 101. Here, the lower support columns 103 can be wooden columns, which provide stable and reliable support. The elevation of the overall structure can be controlled by presetting the height of the lower support columns 103, which is conducive to construction precision control.

[0053] In this embodiment, the upper wooden formwork 4 and the lower wooden formwork 3 are fixed by self-tapping screws 6. It can be understood that a plurality of self-tapping screws 6 are provided along the length direction of the upper wooden formwork 4; the use of self-tapping screws 6 for fixation has good connection strength, convenient construction, and is conducive to ensuring construction efficiency.

[0054] Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A construction method for cast-in-situ curved beams with double-layer wooden formwork, characterized in that: The steps include: S1: A prefabricated formwork support, the formwork support comprising a bottom support seat (1) and a formwork mounting component (2) arranged on the top of the bottom support seat (1), the formwork mounting component (2) comprising a plurality of formwork mounting plates (201) uniformly arranged along the direction of extension of the arc line of the arc-shaped beam cross section, the plurality of formwork mounting plates (201) being fixedly connected at their ends in sequence, and a V-shaped inflection point structure (201a) being formed between two adjacent formwork mounting plates (201); S2: Installing the formwork supports, installing the formwork supports obtained in step S1 to the preset points on the construction site, and setting the formwork supports in two groups along the length direction of the curved beam; S3: Laying the lower wooden formwork (3), wherein the number of the lower wooden formwork (3) is the same as the number of the formwork mounting plates (201), and both ends of each lower wooden formwork (3) in the length direction are respectively attached to and fixed to the corresponding formwork mounting plates (201) of the corresponding side formwork brackets; S4: Laying the upper wooden formwork (4), in step S3, the upper wooden formwork (4) is laid between the two adjacent lower wooden formworks (3), and the edges at both ends of the upper wooden formwork (4) are fixedly connected to the outer lateral edges of the two lower wooden formworks (3); S5: side formwork installation; S6: pouring, relying on the weight of the concrete to naturally deform the upper wooden formwork (4) at each inflection point structure (201a) to form a smooth arc; The prefabrication steps of the formwork support in step S1 include: S11: prefabricating an arc frame (5) conforming to the arc portion of the cross section of the arc beam to be cast; S12: dividing the arc frame (5) obtained in step S11 into multiple segments of equal arc length, and marking the outer arc surface (5a) of the arc frame (5); S13: Using the line marked in S12 as the alignment line, each template installation plate (201) is welded end to end in sequence to form a template installation component (2); S14: manufacturing a bottom support base (1) according to the support strength requirements, and welding the bottom support base (1) to the bottom of the template mounting component (2); The bottom support seat (1) comprises a cross beam (101) and a plurality of upper support columns (102) fixed on the top of the cross beam (101) and correspondingly arranged with a plurality of template mounting plates (201), wherein the top of each upper support column (102) is welded and fixed to the center of the bottom surface of the corresponding template mounting plate (201).

2. The method for constructing a double-layer wooden formwork cast-in-place curved beam according to claim 1, characterized in that: The arc-shaped frame (5) is formed by bending a tube beam.

3. The method for constructing a double-layer wooden formwork cast-in-place curved beam according to claim 1, characterized in that: The angle between two adjacent template mounting plates (201) ranges from 155 to 170 degrees.

4. The method for constructing a double-layer wooden formwork cast-in-place curved beam according to claim 3, characterized in that: The thickness of the upper wooden formwork (4) ranges from 4 to 8 mm, and the thickness of the upper wooden formwork (4) is smaller than the thickness of the lower wooden formwork (3).

5. The method for constructing a double-layer wooden formwork cast-in-situ curved beam according to claim 4, characterized in that: The width of the lower wooden formwork (3) ranges from 15 to 30 cm.

6. The method for constructing a double-layer wooden formwork cast-in-place curved beam according to claim 1, characterized in that: A movable gap is reserved at the joint between two adjacent upper wooden templates (4), and the movable gap is sealed by filling with sealant (4a).

7. The method for constructing a double-layer wooden formwork cast-in-place curved beam according to claim 1, characterized in that: A plurality of lower support columns (103) are fixedly provided at the bottom of the cross bracing beam (101).

8. The method for constructing a double-layer wooden formwork cast-in-place curved beam according to claim 1, characterized in that: The upper wooden formwork (4) and the lower wooden formwork (3) are fixed together by self-tapping screws (6).

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