Double-layer wood formwork cast-in-place arc-shaped beam construction method

Abstract

The invention discloses a double-layer wood formwork cast-in-place arc-shaped beam construction method. The method comprises the following steps that S1, a formwork support is prefabricated; s2, formwork supports are installed, wherein the formwork supports are arranged into two sets in the length direction of the arc-shaped beam; s3, lower-layer wood formworks are laid, and the two ends, in the length direction, of each lower-layer wood formwork are attached to and fixed to the corresponding formwork mounting plates of the formwork supports on the corresponding sides correspondingly; s4, upper-layer wood formworks are laid, specifically, the upper-layer wood formworks are laid between every two adjacent lower-layer wood formworks in the step S3, and the edges of the two transverse ends of each upper-layer wood formwork are fixedly connected with the transverse outer side edges of the two corresponding lower-layer wood formworks; s5, side formworks are installed; s6, pouring is conducted, and the upper-layer wood formwork naturally deforms to form a smooth arc shape at the break point structures by means of the dead weight of concrete; by means of the double-layer wood formwork cast-in-place arc beam construction method, the construction cost can be reduced, and the construction effect is guaranteed to a certain degree.

Description

Technical Field

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

[0002] At present, in construction, cast-in-place curved beam structures generally use customized formwork such as aluminum formwork or steel formwork, which is relatively expensive and has a low utilization rate. The cost can only be reduced by the turnover of a large number of standard components, which is more suitable for building projects with a large number of standard floors; for non-standard floor public construction projects such as gymnasiums and libraries, the use of a large number of standard components and customized formwork will greatly increase the cost. Therefore, it is urgent to provide a new construction method for cast-in-place curved beams in order to reduce the construction cost and ensure the construction effect to a certain extent. 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 double-layer wooden formwork cast-in-place curved beam construction method, comprising the following steps:

[0005] S1: a prefabricated formwork support, the formwork support comprising a bottom support seat and a formwork installation component arranged on the top of the bottom support seat, the formwork installation component comprising a plurality of formwork installation plates evenly arranged along the extension direction of the arc line of the arc-shaped beam cross section, the head and tail of the plurality of formwork installation plates are fixedly connected in sequence, and a V-shaped inflection point structure is formed between two adjacent formwork installation plates;

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

[0007] S3: Laying the lower wooden formwork, the number of the lower wooden formwork is the same as the formwork mounting plates, and both 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 the edges at both ends of the upper wooden formwork are respectively fixedly connected to the outer lateral edges of the two lower wooden formworks;

[0009] S5: side formwork installation;

[0010] S6: Pouring, relying on the deadweight of the concrete to make the upper wooden formwork deform naturally 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: dividing the arc frame obtained in step S11 into multiple segments of equal arc length, and marking the outer arc surface of the arc frame;

[0014] S13: Using the line marked in S12 as an alignment line, each template installation plate is welded and fixed at the head and tail in sequence to form a template installation component;

[0015] S14: A bottom support seat is manufactured according to the support strength requirements, and the bottom support seat is welded and fixed to the bottom of the template mounting component.

[0016] Furthermore, the arc 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 less 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 templates, 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 arranged corresponding to the plurality of template mounting plates, and the top of each 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-place 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-story public construction projects such as gymnasiums and libraries; specifically, in this construction method, a double-layer wooden formwork is used to cast and form 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 support 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 crease, and the dead weight of the concrete makes the upper wooden formwork deform naturally at each inflection point structure to form a smooth arc, so that the arc-shaped 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 support set in other parts, and can be pre-fabricated as a whole, reducing the later support construction and improving the construction efficiency; the height of the arc-shaped beam to be cast can be controlled by controlling the height of the formwork support, which makes the overall construction convenient, facilitates the construction precision control, and ensures the 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-shaped beam to be constructed on site.

[0026] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The schematic diagram of the cross section of the present invention is

[0028] Figure 2 for Figure 1 A partial enlarged view of the center

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

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

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely 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 In this embodiment, a double-layer wooden formwork cast-in-place curved beam construction method is disclosed, 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 arranged 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 is not limited here, and can form a stable support for the formwork installation component 2. Here, the arc The "horizontal" of the cross section of the curved beam refers to the width direction of the curved beam. The evenly distributed arrangement 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 number of template mounting plates 201 should be increased accordingly according to the molding accuracy (it can be understood that the more the number of the inflection point structures 201a formed is, the closer it is to the design 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 the formwork brackets, installing the formwork brackets obtained in step S1 to the preset points on the construction site, wherein the formwork brackets are arranged in two groups along the length direction of the arc-shaped beam. It can be understood that the two groups of installed formwork brackets are usually arranged at positions close to the ends of the arc-shaped beam in the length direction, and the installed formwork brackets can generally be fixed on the ground by riveting or the like;

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

[0036] S4: Laying the upper wooden formwork 4. In step S3, the upper wooden formwork 4 is laid between two adjacent lower wooden formworks 3. 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. It can be understood that the upper wooden formwork 4 refers to the width direction of the upper wooden formwork 4. 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 adjacent two 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 to form a smooth arc surface under the action of concrete gravity to ensure the construction effect.

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

[0038] S6: pouring, relying on the dead weight of the concrete to make the upper wooden formwork 4 deform naturally 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, which will not be repeated here;

[0039] The above-mentioned double-layer wooden formwork cast-in-place 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 public construction projects such as gymnasiums and libraries; specifically, in this construction method, a double-layer wooden formwork is used to cast and form 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 support 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 is set The creases are alleviated, and the dead 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-shaped beam finally cast has a better molding effect, thereby ensuring the construction quality; at the same time, the formwork support in the present 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, and can effectively reduce the auxiliary reinforcement supports set at other parts, and can be prefabricated as a whole, thereby reducing the subsequent support construction and improving the construction efficiency; the height of the arc-shaped 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 the construction quality; in the present 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-shaped beam to be constructed on site.

[0040] In this embodiment, the prefabrication step of the template 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 mark in S12 as the alignment line, the template installation plates 201 are welded end to end in sequence to form the template installation component 2. Specifically, one end of the template installation plate 201 is placed against the line mark, and the template installation component 2 is quickly manufactured using the line mark as a reference.

[0044] S14: manufacturing a bottom support seat 2 according to the support strength requirement, and welding and fixing the bottom support seat 2 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 installation component 2, and at the same time the construction efficiency is high, and it can be manufactured on site according to specific construction dimensions.

[0046] In this embodiment, the arc frame 5 is formed by bending a tube 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 advantageously deformed after installation, and the arc beam forming effect is excellent.

[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 the present embodiment, a movable gap is reserved at the joint between two adjacent upper 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 the plurality of template mounting plates 201. The top of each 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. The support columns 103 may be wooden columns, which provide stable and reliable support. The elevation of the overall structure can be controlled by presetting the height of the support columns 103, which is beneficial to construction precision control.

[0053] In the present 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 and is convenient for construction, which 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 be included in the scope of the claims of the present invention.

Claims

1. A double-layer wooden formwork cast-in-place curved beam construction method, 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) evenly distributed along the extension direction 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 preset points on the construction site, wherein the formwork supports are arranged in two groups along the length direction of the arc 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), wherein the upper wooden formwork (4) is laid between two adjacent lower wooden formworks (3) in step S3, 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) respectively; S5: side formwork installation; S6: pouring, relying on the deadweight of the concrete to make the upper wooden formwork (4) deform naturally at each inflection point structure (201a) to form a smooth arc.

2. The double-layer wooden formwork cast-in-place curved beam construction method according to claim 1 is characterized in that: 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 an alignment line, each template installation plate (201) is welded end to end in sequence to form a template installation component (2); S14: A bottom support seat (2) is manufactured according to the support strength requirements, and the bottom support seat (2) is welded and fixed to the bottom of the template mounting component (2).

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

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

5. The double-layer wooden formwork cast-in-place curved beam construction method according to claim 4 is 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).

6. The double-layer wooden formwork cast-in-place curved beam construction method according to claim 5 is characterized in that: The width of the lower wooden formwork (3) ranges from 15 to 30 cm.

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

8. The double-layer wooden formwork cast-in-place curved beam construction method according to claim 1 is characterized by: The bottom support seat (1) comprises a cross bracing beam (101) and a plurality of upper support columns (102) fixedly arranged on the top of the cross bracing beam (101) and arranged corresponding to a plurality of template mounting plates (201), wherein the top of each support column (102) is welded and fixed to the center of the bottom surface of the corresponding template mounting plate (201).

9. The double-layer wooden formwork cast-in-place curved beam construction method according to claim 8 is characterized in that: A plurality of lower support columns (103) are fixedly arranged at the bottom of the cross bracing beam (101).

10. The double-layer wooden formwork cast-in-place curved beam construction method according to claim 1 is 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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