A multi-purpose concrete crown beam construction assembled formwork device and construction method thereof

Abstract

The present invention discloses a multi-purpose concrete crown beam construction assembled formwork device, including a crown beam construction formwork and a positioning mechanism. The crown beam construction formwork is provided with a scale, and the positioning mechanism can be installed on the crown beam construction formwork, and the installation position of the positioning mechanism can be adjusted according to the scale; the positioning mechanism is provided with a positioning hole, and the shape of the positioning hole corresponds to the cross-sectional shape of the steel section; when the steel section is inserted into the positioning hole, the insertion position of the steel section is determined based on the installation position of the positioning mechanism. The crown beam construction formwork includes a plurality of side formworks arranged on both sides, and the positioning mechanism is slidably matched with the top of the side formwork to adjust the installation position of the positioning mechanism. The positioning mechanism includes a positioning plate, and the positioning hole is provided on the positioning plate; pulleys are respectively provided on both sides of the positioning plate, and the positioning plate is slidably matched with the slide groove on the side formwork through the pulley. The present invention can position the steel section to prevent the steel section from being displaced.

Description

Technical Field

[0001] The invention relates to the field of building foundation pit engineering, and in particular to a multi-purpose concrete crown beam construction assembled formwork device and a construction method thereof. Background Art

[0002] In the current urban underground space development process, the top support structure of the foundation pit is usually made of cast-in-place reinforced concrete. During the construction of such a structure, it is necessary to complete the steps of steel bar binding, formwork support, concrete pouring, etc., and remove the formwork after the concrete curing is completed. These steps not only significantly extend the construction period, but also have an adverse impact on the progress of the project.

[0003] In the SMW pile method, one of the steps is to insert H-shaped steel into the mixing pile body before the cement soil mixture hardens, forming a continuous and complete underground cement soil mixing pile with certain strength and rigidity. The H-shaped steel should be inserted before the cement soil initially sets. During the insertion process, the steel must be straightened, and it is difficult to position the H-shaped steel when inserting it, which may cause the H-shaped steel to deviate. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a multi-purpose concrete crown beam construction assembled formwork device and a construction method thereof, which can position the steel sections and prevent the steel sections from being displaced.

[0005] Technical solution: To achieve the above-mentioned purpose, the present invention provides a multi-purpose concrete crown beam construction prefabricated formwork device, including a crown beam construction formwork and a positioning mechanism, the crown beam construction formwork is provided with a scale, the positioning mechanism can be installed on the crown beam construction formwork, and the installation position of the positioning mechanism can be adjusted according to the scale; the positioning mechanism is provided with a positioning hole, and the shape of the positioning hole corresponds to the cross-sectional shape of the steel section; when the steel section is inserted into the positioning hole, the insertion position of the steel section is determined based on the installation position of the positioning mechanism.

[0006] Furthermore, the crown beam construction template includes a plurality of side templates arranged on both sides, and the positioning mechanism is slidably matched with the top of the side template to adjust the installation position of the positioning mechanism.

[0007] Furthermore, a slide groove is formed on the top of the side template, and the extension direction of the slide groove is consistent with the length direction of the side template; the positioning mechanism includes a positioning plate, and the positioning hole is opened on the positioning plate; pulleys are respectively provided on both sides of the positioning plate, and the positioning plate is slidably matched with the slide groove on the side template through the pulleys.

[0008] Furthermore, flanges are provided on both sides of the top of the side template, and a slide groove is formed between the flanges on both sides, and scales are correspondingly engraved on the flanges.

[0009] Furthermore, a plurality of pulleys are respectively arranged on both sides of the length direction of the positioning plate, and along the length direction of the positioning plate, the positioning plate is in an arc shape with a bulge in the middle; the length direction of the positioning hole is consistent with the length direction of the positioning plate, and guide rollers are respectively arranged at both ends of the length direction of the positioning hole, and the spacing between the two guide rollers is smaller than the length of the cross-section of the steel section; the positioning plate has a certain deformation ability, and the steel section can squeeze open the guide rollers on both sides and insert into the positioning hole, so that the steel section is clamped by the guide rollers on both sides during the process of moving down along the positioning hole; when the steel section squeezes open the guide rollers on both sides, it tends to flatten the positioning plate, so that the pulleys on both sides of the positioning plate are pressed against the inner wall of the slide groove, so as to clamp the positioning plate on the crown beam construction template.

[0010] Furthermore, the crown beam construction template also includes a connecting component and a detachable guide rail, and adjacent or opposite side templates are connected and fixed by the connecting component; the detachable guide rail is provided with a slide groove that cooperates with the pulley of the positioning plate, and the detachable guide rail is correspondingly installed at the corner of the crown beam construction template, and the two ends of the detachable guide rail can be respectively overlapped on the side templates on both sides, so that the positioning plate can slide to the top of the corner of the crown beam construction template through the detachable guide rail.

[0011] Furthermore, the connection assembly includes a straight line connector, a corner connector, a corner template and an end template; two straight adjacent side templates are connected by a straight line connector; two corner adjacent side templates are connected by a corner connector or a corner template; and two side templates at the end are connected by an end template.

[0012] Furthermore, the connection assembly also includes a tensioning screw; a plurality of tensioning holes are opened on the side formwork, and the tensioning screws penetrate into the tensioning holes of two opposite side formworks and are fixed by screws to fix the two opposite side formworks.

[0013] A construction method of a multi-purpose concrete crown beam construction assembled formwork device comprises the following steps: step S1: positioning and laying out, and excavating a trench; step S2: installing a plurality of side formworks on both sides of the trench, and installing corresponding connection components between adjacent side formworks; step S3: performing mixing pile construction in the guide trench; step S4: installing a positioning plate on the top of the side formwork, and then hoisting a steel section, and inserting the steel section into the mixing pile through a positioning hole on the positioning plate; after inserting a steel section, adjusting the position of the positioning plate according to the scale on the side formwork, and then inserting the next steel section; step S5: after all the steel sections are inserted, removing the positioning plate from the side formwork; step S6: performing steel bar binding, and then installing a tension screw between the opposite side formworks to complete the crown beam construction formwork; step S7: pouring concrete in the crown beam construction formwork, and after the concrete is fully solidified, removing the crown beam construction formwork.

[0014] Furthermore, in step S2, the adjacent side formworks on the outside of the corner are connected by a corner formwork, and one end of the detachable guide rail is overlapped at the connection of the adjacent side formworks on the inside of the corner, and the other end of the detachable guide rail is overlapped at the connection between the side formwork on the outside of the corner and the corner formwork; in step S4, the positioning plate can slide to the top of the corner of the crown beam construction formwork through the detachable guide rail, and after the steel section is inserted into the corner of the crown beam construction formwork, the detachable guide rail is removed; then, the adjacent side formworks on the inside of the corner are reconnected by a corner connector; and the side formworks on the outside of the corner are reconnected with the corner formwork by a straight line connector.

[0015] Beneficial effects: The present invention provides a multi-purpose concrete crown beam construction assembled formwork device and a construction method thereof. The crown beam construction formwork has the function of positioning the steel section. Scales and slide grooves are set on the crown beam construction formwork to allow the positioning plate to slide on the crown beam construction formwork, so that the position of the positioning plate can be accurately controlled, and the steel section can be positioned with the help of the positioning holes on the positioning plate, thereby accurately controlling the insertion position of the steel section to prevent the steel section from being displaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 It is a schematic diagram of the overall structure of the crown beam construction template of the present invention;

[0017] Attached Figure 2 It is a schematic diagram of the installation of the removable guide rail on the crown beam construction template;

[0018] Attached Figure 3 This is a schematic diagram of the installation of the tension screw on the crown beam construction template;

[0019] Attached Figure 4 The structure diagram of the side formwork Figure 1 ;

[0020] Attached Figure 5 The structure diagram of the side formwork Figure 2 ;

[0021] Attached Figure 6 It is a structural schematic diagram of the end template;

[0022] Attached Figure 7 Embodiment of the positioning plate Figure 1 ;

[0023] Attached Figure 8 Embodiment of the positioning plate Figure 2 ;

[0024] Attached Fig. 9 It is a structural schematic diagram of a straight line connector;

[0025] Attached Fig.10 is a schematic diagram of the structure of a corner connector;

[0026] Attached Fig.11 It is a structural schematic diagram of the corner template;

[0027] Attached Fig.12 It is a schematic diagram of the structure of the detachable guide rail;

[0028] Attached Fig.13 It is a schematic diagram of the structure of the tension screw. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] As attached Figures 1 to 13 The multi-purpose concrete crown beam construction assembled formwork device comprises a crown beam construction formwork and a positioning mechanism. The crown beam construction formwork is provided with scales. The positioning mechanism can be installed on the crown beam construction formwork, and the installation position of the positioning mechanism can be adjusted according to the scales.

[0031] In the SMW pile method, one of the steps is to insert the H-shaped cross-section steel into the pile to be mixed before the cement-soil mixture hardens. It is difficult to position the steel and the steel may be displaced. Therefore, in the present invention, a positioning hole 1 is provided on the positioning mechanism, and the shape of the positioning hole 1 corresponds to the cross-sectional shape of the steel so that the steel can be inserted into the positioning hole 1. When the steel is inserted into the positioning hole 1, the insertion position of the steel is determined based on the installation position of the positioning mechanism, thereby positioning the steel.

[0032] In the present invention, in addition to the original functions, the crown beam construction template can also provide support for the positioning mechanism, and measure the moving distance of the positioning mechanism through a scale, thereby accurately controlling the insertion position of the steel section, thereby expanding the use of the crown beam construction template.

[0033] The positioning mechanism is slidably matched with the crown beam construction template. The positioning mechanism can slide on the crown beam construction template to adjust the installation position of the positioning mechanism. The position of the positioning mechanism on the crown beam construction template can be easily adjusted by sliding, thereby reducing the difficulty of operation.

[0034] The crown beam construction template includes a plurality of side templates 2 arranged on both sides, and the positioning mechanism is slidably matched with the top of the side template 2 to adjust the installation position of the positioning mechanism. Figure 4 and 5 As shown in FIG. 1 , a slide groove 3 is formed on the top of the side template 2, and the extending direction of the slide groove 3 is consistent with the length direction of the side template 2. Figure 7 and 8As shown in , the positioning mechanism includes a positioning plate 4, and the positioning hole 1 is opened on the positioning plate 4. Pulleys 5 are respectively arranged on both sides of the positioning plate 4, and the positioning plate 4 is slidably matched with the slide groove 3 on the side template 2 through the pulleys 5, so that the positioning plate 4 can slide on the side template 2 with the help of the pulleys 5 to adjust the position of the positioning plate 4 on the side template 2.

[0035] As attached Figure 4 and 5 As shown in , flanges 6 are respectively provided on both sides of the top of the side template 2, and a slide groove 3 is formed between the flanges 6 on both sides, and scales are correspondingly engraved on the flanges 6. Correspondingly, a positioning indicator line is engraved on the positioning plate 4, and the positioning indicator line can correspond to the scale on the crown beam construction template, so as to conveniently indicate the scale corresponding to the positioning plate 4, so as to more accurately adjust the installation position of the positioning plate 4 on the crown beam construction template, and then more accurately control the insertion position of the steel section.

[0036] An example of a structure of the positioning plate 4 is shown in the attached figure. Figure 7 As shown in , the positioning plate 4 is a flat plate, and the shape of the positioning hole 1 is consistent with the cross-sectional shape of the steel. When such a positioning plate 4 is used, when inserting the steel, it is necessary to manually fix the position of the positioning plate 4 to prevent the positioning plate 4 from slipping on the side template 2.

[0037] Another embodiment of the positioning plate 4 is shown in the attached figure. Figure 8 As shown in the figure, a plurality of pulleys 5 are respectively arranged on both sides of the length direction of the positioning plate 4. Along the length direction of the positioning plate 4, the positioning plate 4 is in an arc shape with the middle part convex upward. When the positioning plate 4 is placed on the side template 2, the length direction of the positioning plate 4 is perpendicular to the length direction of the side template 2, and the pulleys 5 on both sides of the length direction of the positioning plate 4 are respectively placed on the side templates 2 on both sides.

[0038] The cross section of the steel section inserted in the mixing pile is H-shaped, and accordingly, the positioning hole 1 is also H-shaped. The length direction of the positioning hole 1 is consistent with the length direction of the positioning plate 4. Guide rollers 7 are respectively provided at both ends of the length direction of the positioning hole 1, and the guide rollers 7 are rotatably installed at both ends of the positioning hole 1. The spacing between the two guide rollers 7 is smaller than the length of the cross section of the steel section. When the steel section is inserted into the positioning hole 1, the steel section will be connected with the two guide rollers 7 and squeeze the two guide rollers 7. The positioning plate 4 has a certain deformation ability. In the process of inserting the steel section downward into the positioning hole 1, the positioning plate 4 will deform to a certain extent. The steel section can squeeze the guide rollers 7 on both sides and insert into the positioning hole 1, so that the steel section is in a state of being clamped by the guide rollers 7 on both sides during the process of moving down along the positioning hole 1. Since the steel section is in a state of being clamped by the guide rollers 7, the positioning hole 1 has a better positioning effect on the steel section, and the insertion position of the steel section can be controlled more accurately.

[0039] In addition, when the steel section squeezes the guide rollers 7 on both sides, the steel section will tend to flatten the positioning plate 4. As the positioning plate 4 is flattened, the length of the positioning plate 4 will increase, and accordingly, the pulleys 5 on both sides of the positioning plate 4 will move to both sides, so that the pulleys 5 on both sides of the positioning plate 4 are pressed against the inner wall of the slide groove 3 to clamp the positioning plate 4 on the crown beam construction template. Since the positioning plate 4 is in a clamped state during the process of inserting the steel section into the positioning hole 1, the positioning plate 4 will not slip on the side template 2, avoiding the position of the positioning plate 4 from changing, and there is no need to manually fix the position of the positioning plate 4.

[0040] The crown beam construction template also includes a connecting assembly and a detachable guide rail 8, and adjacent or opposite side templates 2 are connected and fixed by the connecting assembly. Figure 2 and 12 As shown, there is a slide groove 3 on the detachable guide rail 8 that matches the pulley 5 of the positioning plate 4. The detachable guide rail 8 is installed at the corner of the crown beam construction template. The two ends of the detachable guide rail 8 can be overlapped on the side templates 2 on both sides, so that the positioning plate 4 can slide to the top of the corner of the crown beam construction template through the detachable guide rail 8. In actual projects, steel sections are also inserted at the corners of the crown beam construction template, but as shown in the attached figure Figure 1 As shown in FIG. 1 , if there is only the side formwork 2, the positioning plate 4 cannot slide to the top of the corner of the crown beam construction formwork, and it is also impossible to position the steel section during the steel section insertion process through the positioning holes 1 on the positioning plate 4. Figure 2 As shown in , by providing a detachable guide rail 8, the positioning plate 4 can slide to above the corner of the crown beam construction template through the detachable guide rail 8.

[0041] Specifically, the connection assembly includes a straight connection member 9, a corner connection member 10, a corner template 11 and an end template 12. The structure of the straight connection member 9 is shown in the attached figure. Fig. 9 As shown in , two vertically adjacent side templates 2 are connected by a linear connector 9, a vertical slide groove 3 is provided on the top of the linear connector 9, and the side templates 2 can be fixedly connected to the linear connector 9 by bolts and other structures.

[0042] The structure of the corner connector 10 is shown in the attached Fig.10 As shown in FIG. 1 , the structure of the corner template 11 is as shown in FIG. Fig.11 As shown in the figure, the top of the corner connector 10 and the top of the corner template 11 are both provided with a corner-shaped slide groove 3. The two side templates 2 adjacent to the corner are connected by the corner connector 10 or the corner template 11;

[0043] The structure of the end template 12 is shown in the attached Figure 6 As shown in FIG, both sides of the end template 12 are provided with slots 15 opening downward. Figure 5As shown in the figure, the two sides of the side template 2 at the end are provided with slots 15 opening upward, while the side templates 2 at other positions are as shown in the figure. Figure 4 At the end position of the crown beam construction template, the side templates 2 are connected through the end templates 12, and the side templates 2 and the end templates 12 are plugged into each other through the slots 15.

[0044] The connecting assembly also includes a tension screw 13, the structure of which is shown in the attached figure. Fig.13 As shown, a plurality of pulling holes 14 are provided on the side formwork 2. Figure 3 As shown in , when forming a complete crown beam construction template, the tensioning screw 13 penetrates into the tensioning holes 14 of two opposite side templates 2 and is fixed by screws to fix the two opposite side templates 2.

[0045] When the crown beam construction template in the present invention is only used for crown beam construction, the first step is to excavate the foundation pit: according to the design drawings, the foundation pit excavation operation is performed to ensure that the excavation size, depth and soil quality meet the design requirements;

[0046] The second step is to process the steel bars: refer to the design drawings to cut, weld, bend and process the steel bars to ensure that the quality and specifications of the steel bars meet the requirements;

[0047] The third step is to install the crown beam construction template: follow the design regulations, first install the side template 2, then pass the tension screw 13 through the tension hole 14 on the side template 2, and fix it with screws; the side templates 2 can be connected by a straight connector 9, and when encountering a corner, the outer side is connected by a corner template 11, and the inner side is connected by a corner connector 10; near the end, the end template 12 is used for connection, and the side template 2 and the end template 12 are connected by a slot 15;

[0048] Step 4: Concrete pouring: Pour the evenly mixed concrete into the formwork and compact it with a vibrator to ensure that the concrete fully fills the formwork and eliminates air bubbles;

[0049] Step 5, maintenance: After the concrete is poured, appropriate maintenance measures are implemented, such as covering with straw mats, spraying water, etc., to ensure that the concrete is fully solidified and the strength is developed;

[0050] Step 6: demoulding: when the concrete reaches a predetermined strength, remove the tension screws 13 and then use a crane to lift the concrete through the flange 6 of the side formwork 2.

[0051] In addition, the present invention also provides a construction method of a multi-purpose concrete crown beam construction assembled formwork device, which can take into account the positioning of the steel in the SMW method pile and realize the multi-functional application of the crown beam construction formwork, including the following steps:

[0052] Step S1: Positioning and laying out, excavating trenches; specifically, measuring and laying out, laying out the retaining pile edge lines and control lines according to the axis reference points, setting up temporary control signs, and doing a good job of technical review; then excavating trenches and clearing underground obstacles, and the trench width is determined according to the width of the retaining structure;

[0053] Step S2: Install several side templates 2 on both sides of the groove, and install corresponding connection components between adjacent side templates 2; first install the side templates 2 on both sides, and the side templates 2 can be connected by a straight connecting piece 9; when encountering a corner, use a corner template 11 and a detachable guide rail 8 for connection; near the end, use an end template 12 for connection;

[0054] Step S3: Carry out mixing pile construction in the guide trench; determine the drilling and mixing construction sequence according to the construction site conditions, usually adopt the skip-slot double-hole full-set drilling and re-mixing continuous method; strictly control the sinking and lifting speed of the mixing drill, the spraying sinking speed should be controlled at 0.5-1m / min, and the lifting speed should be controlled at 1-2m / min, and the drilling and lifting should be carried out at a uniform speed to fully mix the cement slurry and the original foundation soil;

[0055] Step S4: Install the positioning plate 4 on the top of the side formwork 2, then hoist the steel section by a crane, and insert the steel section into the mixing pile through the positioning hole 1 on the positioning plate 4; align the positioning indicator line on the positioning plate 4 with the scale on the flange 6 of the side formwork 2 to determine the position of the steel section; after inserting a steel section, adjust the position of the positioning plate 4 according to the scale on the side formwork 2, and then insert the next steel section; at a straight line, the positioning plate 4 can be directly pushed to move; at a corner, the position of the positioning plate 4 needs to be changed by a crane;

[0056] Step S5: After all the steel sections are inserted, the positioning plate 4 is removed from the side formwork 2, that is, the positioning plate 4 is lifted away by a crane;

[0057] Step S6: Referring to the design drawings, the steel bars are cut, welded, bent, and processed to ensure that the steel bars are straight and the specifications meet the requirements, and then the steel bars are tied according to the relevant specifications; then the tension screws 13 are installed between the opposite side templates 2, that is, the tension screws 13 are passed through the tension screw holes on the side templates, and then fixed with screws, so as to complete the crown beam construction template;

[0058] Step S7: pouring concrete in the crown beam construction template, and removing the crown beam construction template after the concrete is fully solidified.

[0059] Specifically, in step S2, the adjacent side templates 2 on the outside of the corner are connected by using the corner template 11, and one end of the detachable guide rail 8 is overlapped at the connection of the adjacent side templates 2 on the inside of the corner, and the other end of the detachable guide rail 8 is overlapped at the connection between the side template 2 on the outside of the corner and the corner template 11, so as to form an attached Figure 2 In step S4, the positioning plate 4 can slide to the top of the corner of the crown beam construction template through the detachable guide rail 8. After the steel section is inserted into the corner of the crown beam construction template, the detachable guide rail 8 is removed; then, the corner connector 10 is used to reconnect the adjacent side templates 2 on the inner side of the corner; the linear connector 9 is used to reconnect the side templates 2 on the outer side of the corner with the corner template 11 to form an attached Figure 1 Therefore, in the present invention, by providing a detachable guide rail 8, the problem of inserting the section steel at the corner can be solved.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-purpose concrete crown beam construction assembled formwork device, characterized in that: The invention comprises a crown beam construction template and a positioning mechanism, wherein the crown beam construction template is provided with a scale, the positioning mechanism can be installed on the crown beam construction template, and the installation position of the positioning mechanism can be adjusted according to the scale; the positioning mechanism is provided with a positioning hole (1), and the shape of the positioning hole (1) corresponds to the cross-sectional shape of the steel section; when the steel section is inserted into the positioning hole (1), the insertion position of the steel section is determined based on the installation position of the positioning mechanism.

2. A multi-purpose concrete crown beam construction assembled formwork device according to claim 2, characterized in that: The crown beam construction template comprises a plurality of side templates (2) arranged on both sides, and the positioning mechanism is slidably matched with the top of the side template (2) to adjust the installation position of the positioning mechanism.

3. A multi-purpose concrete crown beam construction assembled formwork device according to claim 2, characterized in that: A slide groove (3) is formed on the top of the side template (2), and the extension direction of the slide groove (3) is consistent with the length direction of the side template (2); the positioning mechanism includes a positioning plate (4), and the positioning hole (1) is opened on the positioning plate (4); pulleys (5) are respectively arranged on both sides of the positioning plate (4), and the positioning plate (4) is slidably matched with the slide groove (3) on the side template (2) through the pulleys (5).

4. A multi-purpose concrete crown beam construction assembled formwork device according to claim 3, characterized in that: The top two sides of the side template (2) are respectively provided with flanges (6), a slide groove (3) is formed between the flanges (6) on both sides, and scales are correspondingly engraved on the flanges (6).

5. The multi-purpose concrete crown beam construction assembled formwork device according to claim 3, characterized in that: A plurality of pulleys (5) are respectively arranged on both sides of the length direction of the positioning plate (4), and along the length direction of the positioning plate (4), the positioning plate (4) is in an arc shape with the middle part convex upward; the length direction of the positioning hole (1) is consistent with the length direction of the positioning plate (4), and guide rollers (7) are respectively arranged at both ends of the length direction of the positioning hole (1), and the distance between the two guide rollers (7) is less than the length of the cross section of the steel section; The positioning plate (4) has a certain deformation capacity, and the steel section can squeeze open the guide rollers (7) on both sides and be inserted into the positioning hole (1), so that the steel section is in a state of being clamped by the guide rollers (7) on both sides during the process of moving down along the positioning hole (1); when the steel section squeezes open the guide rollers (7) on both sides, it has a tendency to flatten the positioning plate (4), so that the pulleys (5) on both sides of the positioning plate (4) are pressed against the inner wall of the slide groove (3), so that the positioning plate (4) is clamped on the crown beam construction template.

6. The multi-purpose concrete crown beam construction assembled formwork device according to claim 3, characterized in that: The crown beam construction template also includes a connecting component and a detachable guide rail (8), and adjacent or opposite side templates (2) are connected and fixed by the connecting component; the detachable guide rail (8) is provided with a slide groove (3) that matches the pulley (5) of the positioning plate (4), and the detachable guide rail (8) is correspondingly installed at the corner of the crown beam construction template, and the two ends of the detachable guide rail (8) can be respectively overlapped on the side templates (2) on both sides, so that the positioning plate (4) can slide to the top of the corner of the crown beam construction template through the detachable guide rail (8).

7. A multi-purpose concrete crown beam construction assembled formwork device according to claim 6, characterized in that: The connection assembly comprises a straight connecting piece (9), a corner connecting piece (10), a corner template (11) and an end template (12); two side templates (2) adjacent in a straight direction are connected via the straight connecting piece (9); two side templates (2) adjacent in a corner are connected via the corner connecting piece (10) or the corner template (11); and two side templates (2) at the end are connected via the end template (12).

8. The multi-purpose concrete crown beam construction assembled formwork device according to claim 7, characterized in that: The connection assembly also includes a tensioning screw rod (13); a plurality of tensioning holes (14) are provided on the side formwork (2); the tensioning screw rod (13) is inserted into the tensioning holes (14) of two opposite side formworks (2) and is fixed by screws to fix the two opposite side formworks (2).

9. The construction method of a multi-purpose concrete crown beam construction assembled formwork device according to claim 8, characterized in that: The following steps are involved: Step S1: positioning and laying out the lines, and excavating trenches; Step S2: installing a plurality of side templates (2) on both sides of the groove, and installing corresponding connection components between adjacent side templates (2); Step S3: constructing mixing piles in the guide ditch; Step S4: Install the positioning plate (4) on the top of the side formwork (2), then hoist the steel section, and insert the steel section into the mixing pile through the positioning hole (1) on the positioning plate (4); after inserting one steel section, adjust the position of the positioning plate (4) according to the scale on the side formwork (2), and then insert the next steel section; Step S5: After all the steel sections have been inserted, the positioning plate (4) is removed from the side formwork (2); Step S6: tie the steel bars, then install the tension screws (13) between the opposite side formworks (2), and assemble the crown beam construction formwork; Step S7: pouring concrete in the crown beam construction template, and removing the crown beam construction template after the concrete is fully solidified.

10. The construction method of a multi-purpose concrete crown beam construction assembled formwork device according to claim 9, characterized in that: In step S2, the adjacent side templates (2) on the outside of the corner are connected by using the corner template (11), and one end of the detachable guide rail (8) is overlapped at the connection between the adjacent side templates (2) on the inside of the corner, and the other end of the detachable guide rail (8) is overlapped at the connection between the side template (2) on the outside of the corner and the corner template (11); In step S4, the positioning plate (4) can slide to the top of the corner of the crown beam construction template via the detachable guide rail (8). After the steel section is inserted into the corner of the crown beam construction template, the detachable guide rail (8) is removed; then, the adjacent side templates (2) on the inner side of the corner are reconnected using the corner connector (10); and the side templates (2) on the outer side of the corner are reconnected to the corner template (11) using the straight connector (9).

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