Construction method of cast-in-place concrete trapezoidal open trench formwork support

Abstract

The invention belongs to the technical field of cast-in-place concrete formwork supporting construction. In order to solve the problems of poor construction quality and low efficiency of the slope surface of the cast-in-place concrete trapezoidal open trench, the invention provides a formwork supporting construction method for the cast-in-place concrete trapezoidal open trench, which comprises the following steps of: manufacturing structures such as a slope surface formwork, a side formwork, a slope top edge formwork, a slope top side edge formwork and a gravity type load; according to the formwork supporting construction method, it can be effectively guaranteed that the slope surface of the trapezoid open trench is flat, dense and smooth, the roughness can be reduced, the water passing capacity is improved, the anti-seepage effect is enhanced, the service life of the drainage trench is prolonged, the construction structure adopted in the method is simple, the design is reasonable, reliability is high, the effect is good, and when the construction method is used for construction, the slope surface is attractive; the quality of the cast-in-place concrete slope is effectively guaranteed, and the construction manpower and time cost can be greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of cast-in-place concrete formwork support construction, and in particular relates to a cast-in-place concrete trapezoidal open ditch formwork support construction method. Background Art

[0002] Trapezoidal open ditch is a commonly used drainage ditch in the airport drainage system. It can effectively remove the water from the airport runway and surrounding areas, ensuring the safety and smoothness of the airport operation. The flat, dense and smooth slope of the trapezoidal open ditch can reduce the roughness, improve the water flow capacity, enhance the anti-seepage effect, and extend the service life of the drainage ditch.

[0003] In the construction process of cast-in-place concrete trapezoidal open ditch, the traditional methods of construction of formwork and casting were adopted. The traditional construction of formwork is time-consuming and labor-intensive. If wooden formwork is used, it is easy to deform or even run away. The turnover rate of wooden formwork is relatively low. The gravity sliding membrane system requires driving parts and the structure is relatively complicated.

[0004] In the construction process of cast-in-place concrete trapezoidal open ditch, low slump concrete is directly poured, manually vibrated, leveled and manually finished more than three times. This method is relatively primitive. When the slope and ditch depth are large, it is difficult to ensure the flatness and density of the slope during the construction process, and the construction efficiency is low. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a cast-in-place concrete trapezoidal open ditch formwork support construction method for improving the cast-in-place concrete trapezoidal open ditch slope construction quality and the construction efficiency of operators.

[0006] The present invention provides a cast-in-place concrete trapezoidal open ditch formwork support construction method, comprising the following steps:

[0007] S1. The bottom of the trapezoidal open ditch is first cast, and the cast-in-place reinforced concrete on the slope of the trapezoidal open ditch is constructed by the alternate-cast method;

[0008] S2. The two sides of the supporting side formwork are called independent warehouse sections. The independent warehouse section side formwork, slope top side formwork and slope top side formwork are made of rectangular steel pipes and fixed with steel chisels and pads.

[0009] S3. The slope formwork is made of rectangular steel pipes, steel plates and concrete, and is made into rectangular blocks of a certain length, thickness and width. After the construction of step 2 is completed, the slope formwork is placed by a crane;

[0010] S4. The slope formwork is fixed by adding load. The slope formwork is placed close to the upper surface of the side formwork of the independent warehouse section, and a gravity load is placed to counter-press the slope formwork on both sides;

[0011] S5. Pour the concrete at the position where the formwork is supported and vibrate it to make it dense;

[0012] S6, as in step S3 above, continue to place the slope template, add load to ensure that it is stable and does not move, pour and compact the cast-in-place concrete on the slope, until the concrete pouring construction of the independent warehouse section is completed, and remove the template and finish the surface in time;

[0013] S7. The cast-in-place concrete trapezoidal open ditch in the filling section does not need to support the side formwork of the independent section. However, when placing the slope formwork, a certain thickness of iron sheet must be laid on the completed slope of the adjacent independent section to prevent the slope formwork from directly hitting the completed slope and causing damage to the finished product. Other construction methods are the same as those for the cast-in-place concrete trapezoidal open ditch independent section.

[0014] Optionally, the side formwork of the independent warehouse section, the slope top edge formwork and the slope top side edge formwork are made of rectangular steel pipes with a wall thickness of 5 mm and a width of 8 cm. The height of the steel pipe is the thickness of the concrete trapezoidal open ditch slope, and the length is greater than the depth of the slope. The bottom of the side formwork of the independent warehouse section is cut into a fitting bevel with the bottom of the ditch.

[0015] Optionally, the length of the slope formwork is greater than the compartment length of the cast-in-place concrete trapezoidal open ditch, the overlap width is 0.5m, the width of the slope formwork is 1.2m, and the thickness of the steel plate and rectangular steel pipe material of the slope formwork is 8mm.

[0016] Optionally, the gravity load adopted by the slope formwork at the lowest point of the ditch bottom is an inverted trapezoidal concrete structure, whose structural dimensions are made according to the designed slope and ditch bottom width, and the remaining slope formworks at the upper part adopt rectangular concrete blocks as their gravity loads.

[0017] Optionally, the iron sheet is a galvanized iron sheet with a thickness of not less than 1 mm, a length the same as a width of the slope formwork, and a width not less than a width of the slope formwork overlapped on the cast warehouse section.

[0018] Compared with the prior art, the technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0019] The embodiment of the present invention provides a construction method for supporting a cast-in-place concrete trapezoidal open ditch formwork. The ditch bottom poured first can be used as a support when pouring slope concrete to avoid sliding deformation and facilitate slope pouring. The slope is poured by skipping the warehouse, so that the time interval between the poured and newly poured slope concrete is relatively long. The poured slope solidifies and hardens, so when new concrete is poured next to it, its structure is not easily disturbed. The expansion joint plate material is easy to set and relatively standardized. The formwork support is relatively simple, and the turnover number is higher than that of wooden formwork. In addition, the formwork support method has high template stability, rigidity and position accuracy, which is convenient for full vibration, and the slope flatness is good, the construction efficiency is high, and when a crane is used to place the slope formwork, it is effectively avoided that the slope formwork causes bumps and damage to the poured independent warehouse concrete slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 It is a structural schematic diagram of the cast-in-place concrete trapezoidal open ditch independent bin section slope template and gravity load placement according to an embodiment of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the support of the independent bin section side formwork and the trench top formwork of the cast-in-place concrete trapezoidal open trench according to the embodiment of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the top edge formwork, slope surface formwork and gravity load placement of the cast-in-place concrete trapezoidal open ditch filling section according to an embodiment of the present invention.

[0025] Among them, 1. Independent warehouse section side formwork; 2. Slope top side formwork; 3. Slope top side formwork; 4. Slope surface formwork; 5. First gravity load; 6. Slope surface formwork hook; 7. First gravity load hook; 8. Second gravity load; 9. Second gravity load hook. DETAILED DESCRIPTION

[0026] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] Reference Figures 1 to 3 As shown, an embodiment of the present invention provides a method for supporting a cast-in-place concrete trapezoidal open ditch formwork, comprising the following steps:

[0029] By making the slope formwork 4, the independent warehouse section side formwork 1, the slope top edge formwork 2, the slope top side formwork 3, the gravity load and other structures, they are used as the main components for supporting the cast-in-place concrete trapezoidal open ditch formwork.

[0030] like Figure 2 As shown, in this construction, the ditch depth is 0.4m to 4.65m, the ditch bottom width is 0.4m, and the length of the independent warehouse section side formwork 1 is set to 8m; the slope of the trapezoidal open ditch slope is 1:1.25, the slope angle is 38°40′, and the bottom cutting positive angle of the independent warehouse section side formwork 1 is 141°20′; the steel pipe wall thickness of the independent warehouse section side formwork 1, the slope top side formwork 2, and the slope top side formwork 3 is 5mm, and the width is 8cm; the concrete thickness of the trapezoidal open ditch is 18cm, and the steel pipe height of the independent warehouse section side formwork 1, the slope top side formwork 2, and the slope top side formwork 3 is all set to 18cm; the compartment casting width is 5m, and the length of the slope top side formwork 3 is 6m; the width of the trapezoidal open ditch slope top pressure top is 0.5m, the length of the ditch top side formwork is 0.5m, and the joint with the independent warehouse section side formwork 1 is cut and fitted at an angle of 141°20′.

[0031] like Figure 1 As shown, the length, width and thickness of the slope rectangular load are 6m×1.2m×0.2m respectively. The wall thickness of the rectangular steel pipe and steel plate used is 8mm, the height of the steel pipe is 19cm, the rectangular steel pipe and the steel plate are connected by welding, rectangular steel pipes are arranged in the middle and around the rectangular load, the hollow part is filled with cast-in-place concrete, and the slope formwork hook 6 is embedded in advance, and the slope formwork hook 6 is welded to the steel plate.

[0032] In this example, the first gravity load 5 supports the independent warehouse section side formwork 1 and the slope formwork 4 in the cast trapezoidal open ditch, and is made of cast-in-place concrete. The height of the inverted trapezoidal first gravity load 5 is 0.6m; the second gravity load 8 is a concrete cuboid, and the first gravity load hook 7 and the second gravity load hook 9 are pre-buried respectively. The length, width and height are customized according to the depth of the cast trapezoidal open ditch. When the second layer of slope formwork 4 is back-pressed, the length, width and thickness are 2.9m×0.5m×0.5m, and when the third layer of slope formwork 4 is back-pressed, the length, width and thickness are 5m×0.5m×0.5m.

[0033] In this example, during the filling construction, the slope template 4 is overlapped on the poured slope, and the poured slope is covered with a galvanized iron sheet with a thickness of not less than 1 mm, a length of 1.2 m, and a width of 0.5 m.

[0034] Specific steps, such as Figure 1 , Figure 2 and Figure 3 As shown:

[0035] S1. First, cast cast-in-place concrete trapezoidal open ditch bottom, and cast-in-place reinforced concrete on the slope of the trapezoidal open ditch by using the alternate-cast-one-drilling method;

[0036] S2. Set the elevation and the trench bottom line, set up the independent warehouse section side formwork 1, the slope top side formwork 2 and the slope top side formwork 3, fix them with steel chisels and pads, and apply a demoulding agent on the inside;

[0037] S3, apply a demoulding agent on the inner side of the slope formwork 4, place the slope formwork 4 and the first gravity load 5 by using a crane, pour concrete and vibrate to make it dense;

[0038] S4, repeat the above steps until the concrete pouring of the slope is completed, and the top of the slope is pressed and the surface is initially finished;

[0039] S5. Remove the slope template 4 in time according to the temperature and other conditions, and press the top of the slope to close the surface;

[0040] S6. During the filling construction, the expansion joint plate is placed, and there is no need to support the side formwork 1 of the independent warehouse section and the side formwork 3 of the slope top. However, when placing the slope formwork, a 2mm thick galvanized iron sheet is required to be laid on the completed slope of the adjacent independent warehouse section. Other construction is the same as the independent warehouse;

[0041] S7. The cast-in-place concrete trapezoidal open ditch in the filling section does not need to support the side formwork 1 of the independent section. However, when placing the slope formwork, it is necessary to lay a 1mm thick galvanized iron sheet with a length of 1.2m and a width of 0.5m on the completed slope of the adjacent independent section to prevent the slope formwork 4 from directly hitting the completed slope and causing damage to the finished product. Other construction methods are the same as those of the cast-in-place concrete trapezoidal open ditch independent section.

[0042] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0043] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features invented herein.

Claims

1. A method for supporting cast-in-place concrete trapezoidal open ditch formwork, characterized in that: The steps include: S1. The bottom of the trapezoidal open ditch is first cast, and the cast-in-place reinforced concrete on the slope of the trapezoidal open ditch is constructed by the alternate-cast method; S2, the two sides of the supporting side formwork are called independent warehouse sections, and the independent warehouse section side formwork (1), the slope top side formwork (2) and the slope top side formwork (3) are made of rectangular steel pipes and fixed with steel chisels and pads; S3. The slope formwork (4) is made of rectangular steel pipes, steel plates and concrete, and is made into rectangular blocks of a certain length, thickness and width. After the construction of step 2 is completed, the slope formwork (4) is placed by a crane; S4, the slope formwork (4) is fixed by adding load, the slope formwork (4) is placed close to the upper surface of the side formwork (1) of the independent warehouse section, and a gravity load is placed to counter-press the slope formwork (4) on both sides; S5. Pour the concrete at the position where the formwork is supported and vibrate it to make it dense; S6. Continue to place the slope template (4) as in step 3 above, add load to ensure that it is stable and does not move, pour and compact the slope surface cast-in-place concrete, until the concrete pouring construction of the independent warehouse section is completed, and remove the template and finish the surface in time; S7. The cast-in-place concrete trapezoidal open ditch of the filling section does not need to support the side formwork (1) of the independent section. However, when placing the slope template, a certain thickness of iron sheet needs to be laid on the completed slope of the adjacent independent section to prevent the slope template (4) from directly hitting the completed slope and causing damage to the finished product. Other construction methods are the same as those of the cast-in-place concrete trapezoidal open ditch independent section.

2. A cast-in-place concrete trapezoidal open ditch formwork support construction method according to claim 1, characterized in that: The independent warehouse section side formwork (1), the slope top edge formwork (2) and the slope top side edge formwork (3) are made of rectangular steel pipes, the steel pipe wall thickness is 5 mm, the width is 8 cm, the height is the concrete thickness of the concrete trapezoidal open ditch slope surface, and the length is greater than the slope surface depth. The bottom of the independent warehouse section side formwork (1) is cut into a matching bevel with the ditch bottom.

3. A cast-in-place concrete trapezoidal open ditch formwork support construction method according to claim 1, characterized in that: The length of the slope template (4) is greater than the compartment length of the cast-in-place concrete trapezoidal open ditch, the overlap width is 0.5m, the width of the slope template (4) is 1.2m, and the thickness of the steel plate and rectangular steel pipe material of the slope template (4) is 8mm.

4. A cast-in-place concrete trapezoidal open ditch formwork support construction method according to claim 1, characterized in that: The gravity load adopted by the slope template (4) at the lowest part of the ditch bottom is an inverted trapezoidal concrete structure, and its structural size is made according to the designed slope and the width of the ditch bottom. The remaining slope templates (4) at the upper part adopt rectangular concrete blocks as their gravity loads.

5. A cast-in-place concrete trapezoidal open ditch formwork support construction method according to claim 1, characterized in that: The iron sheet is a galvanized iron sheet with a thickness of not less than 1 mm, and has a length equal to the width of the slope template (4) and a width not less than the width of the slope template (4) overlapped on the cast warehouse section.

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