Bridge pier column formwork construction method based on BIM

Abstract

The invention relates to a BIM (Building Information Modeling)-based bridge pier column template construction method. The method comprises the following steps: modeling to obtain a bridge pier column model; building a pier column template model on the bridge pier column model; dividing the pier column template model into a straining beam section template, a standard section template, an adjusting section template, a pier cap template and a straining beam template; manufacturing a straining beam section template, a standard section template, an adjusting section template, a pier cap template and a straining beam template; a formwork reinforcing beam and a straining beam reinforcing beam are manufactured; when the formworks are constructed, the formworks are sequentially installed from bottom to top, the reinforcing beams are installed, and every two adjacent reinforcing beams are connected through a tensioning device. And after pier column pouring construction is completed, the reinforcing beam, the straining beam section formwork, the standard section formwork, the adjusting section formwork, the pier cap formwork and the straining beam formwork are dismantled, and construction of the next pier column is conducted. According to the method, through BIM modeling and segmentation of the pier column formwork, the machining precision can be improved, and the installation quality is guaranteed; and the reinforcing beam and part of the templates can be recycled, so that the material consumption is reduced.

Description

Technical Field

[0001] The present invention relates to a bridge construction technology, in particular to a bridge pier formwork construction method based on BIM. Background Art

[0002] In traditional municipal road overpass pier construction, the pier formwork and support beams are generally designed and constructed in an integrated manner. The pier and column cap formwork uses steel forming formwork, which is finalized and manufactured by the processing plant. The formwork and reinforcement beam system are designed and processed in an integrated manner. When the pier and column cap models are single, the construction formwork can be used in a cyclical manner, and the construction cost is acceptable. However, in the construction of large-scale municipal road viaducts, especially overpasses, due to the large number of piers and the wide variety of pier and column cap models, the use of integrated design and construction will require the production of multiple formwork and support beam systems to meet on-site construction requirements. A large number of formwork and reinforcement beams must be processed to meet the requirements. However, such formwork cannot be circulated after use and can only be discarded, resulting in very high construction costs. Summary of the Invention

[0003] The purpose of the present invention is to provide a BIM-based bridge pier formwork construction method to solve the problem of high construction costs due to the large number of bridge pier and column cap models and the large amount of formwork processing.

[0004] The present invention is achieved as follows: a BIM-based bridge pier formwork construction method includes the following steps.

[0005] a. Model the bridge piers according to the design drawings of the bridge to obtain a bridge pier model.

[0006] b. Establish a pier column template model on the bridge pier column model.

[0007] c. Divide the pier column formwork model into tie beam section formwork, standard section formwork, adjustment section formwork, pier cap formwork and tie beam formwork.

[0008] d. Make tie beam section templates, standard section templates, adjustment section templates, pier cap templates and tie beam templates according to the template model divided in step c.

[0009] e. Make formwork reinforcement beams and tie beam reinforcement beams, respectively open a number of plug holes at both ends of the formwork reinforcement beam, respectively open tensioning holes at both ends of the tie beam reinforcement beam, and set a corbel perpendicular to the tie beam reinforcement beam on the side of one end of the tie beam reinforcement beam, and open a plug hole on the corbel.

[0010] f. During the construction of bridge pier formwork, the formwork is installed in sequence from bottom to top, and formwork reinforcement beams are horizontally set around each standard section formwork, adjustment section formwork and pier cap formwork that is not connected to the tie beam. Two adjacent formwork reinforcement beams are connected by a tensioning device. Formwork reinforcement beams are horizontally set on the outside of the tie beam section formwork and the pier cap formwork connected to the tie beam. Tie beam reinforcement beams are vertically set on both sides of the end of the tie beam formwork. The corbels are located at the lower end or upper end of the tie beam reinforcement beams. Tension bolts are connected at both ends of the two tie beam reinforcement beams through tensioning holes. Two adjacent formwork reinforcement beams and between the formwork reinforcement beam and the corbels are connected by a tensioning device.

[0011] g. After the pier column casting construction is completed, the formwork reinforcement beams, tie beam reinforcement beams, tie beam section formwork, standard section formwork, adjustment section formwork, pier cap formwork and tie beam formwork shall be removed.

[0012] Furthermore, the template reinforcement beam includes two first connecting rods arranged in parallel, and the two first connecting rods are connected to each other by a connecting plate. The template reinforcement beam is divided into a first template reinforcement beam and a second template reinforcement beam according to the spacing between the two first connecting rods. The spacing between the two first connecting rods in the first template reinforcement beam is greater than or equal to the total thickness of the second template reinforcement beam.

[0013] Furthermore, the corbel includes two second connecting rods arranged in parallel, the two second connecting rods are connected to each other through a connecting plate, and the thickness of the corbel is less than or equal to the distance between the two first connecting rods in the first template reinforcement beam.

[0014] Furthermore, a reinforcing rib is provided in parallel on one side of the template reinforcement beam, the length of the reinforcing rib is less than the length of the template reinforcement beam and the center of the reinforcing rib coincides with the center of the template reinforcement beam.

[0015] Furthermore, the tensioning device includes a fastening bolt, a pin with a hole and a gasket with a hole. The pin with a hole is respectively inserted into the connecting holes of two adjacent formwork reinforcement beams or the connecting holes of the corbels on two adjacent formwork reinforcement beams and the tie beam reinforcement beam. The fastening bolt passes through the through-holes in the middle of the two pins with a hole at the same time. A gasket with a hole is arranged at the end of the fastening bolt and a nut is screwed on. By tightening the nut, the two formwork reinforcement beams or the corbels on the formwork reinforcement beam and the tie beam reinforcement beam are connected and tensioned.

[0016] Furthermore, a reinforcement support is provided on the outer side of the inclined arc surface of the pier cap formwork, the outer side surface of the reinforcement support is a vertical surface, and the formwork reinforcement beam is installed on the reinforcement support.

[0017] Furthermore, for the pier cap formwork connected to the tie beam, the height of the reinforcement support is lower than the lower surface of the tie beam or higher than the upper surface of the tie beam.

[0018] Furthermore, the tie beam section template, standard section template and adjustment section template are all spliced ​​together by two types of templates: [-shaped and |-shaped.

[0019] Furthermore, when the tie beam is located at the lower part of the tie beam section formwork or the pier cap formwork, the formwork reinforcement beam is arranged above the tie beam; when the tie beam is located at the upper part of the tie beam section formwork or the pier cap formwork, the formwork reinforcement beam is arranged below the tie beam.

[0020] Furthermore, the template reinforcement beam and the tie beam reinforcement beam are both made of channel steel.

[0021] The present invention uses BIM modeling and divides the pier column formwork into sections, which can improve processing accuracy and ensure installation quality; and adopts separate design, production and installation of the formwork and reinforcement beam, which can make the reinforcement beam and part of the formwork therein reusable, greatly reducing material consumption, lowering measures costs, and realizing green construction.

[0022] The template reinforcement beam and the tie beam reinforcement beam of the present invention can be used in conjunction with each other, are easy to disassemble and assemble, and can improve the connection strength and stability of the template at the tie beam, which is beneficial to ensuring the construction quality of the pier columns and tie beams. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the pier column template of the present invention.

[0024] Figure 2 yes Figure 1 AA view.

[0025] Figure 3 yes Figure 1 BB direction view.

[0026] Figure 4 It is a structural diagram of the template reinforcement beam of the present invention.

[0027] Figure 5 It is a side view of the first template reinforcement beam of the present invention.

[0028] Figure 6 It is a side view of the second template reinforcement beam of the present invention.

[0029] Figure 7 It is a structural diagram of the tie beam reinforcement beam of the present invention.

[0030] Figure 8 yes Figure 7 Left view of .

[0031] Figure 9 yes Figure 7 Top view of .

[0032] Figure 10It is a schematic diagram of the installation of the standard section formwork reinforcement beam of the present invention.

[0033] Figure 11 It is a schematic diagram of the installation of the reinforcement beam at the connection between the pier cap and the tie beam of the present invention.

[0034] Figure 12 It is a structural diagram of the tensioning device of the present invention.

[0035] In the figure: 1. Standard section formwork; 2. Adjustment section formwork; 3. Tie beam section formwork; 4. Pier cap formwork; 5. Tie beam formwork; 6. Formwork reinforcement beam; 7. Strengthening rib; 8. Connecting hole; 9. Tie beam reinforcement beam; 10. Corbel; 11. Tension hole; 12. Tension bolt; 13. Fastening bolt; 14. Pin with hole; 15. Gasket with hole; 16. Nut; 17. First connecting rod; 18. Second connecting rod; 19. Connecting plate. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used to indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are used solely to facilitate the description of the present invention and to simplify the description. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, terms such as "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] The BIM-based bridge pier formwork construction method of the present invention specifically includes the following steps.

[0039] a. Model the bridge piers based on the actual project bridge design drawings to obtain the models of each bridge pier. The height, shape, tie beam position, pier cap shape and size of each pier vary to a certain extent.

[0040] like Figure 1 、 Figure 2 as well as Figure 3 As shown, taking a pier column as an example, the cross section of the pier column is rectangular, and it includes two tie beams, the middle tie beam is located between the two columns, and the upper tie beam is located between the two pier caps.

[0041] b. Establish a pier column template model on the established bridge pier column model.

[0042] c. Segment the pier column formwork model into a tie beam section formwork 3, a standard section formwork 1, an adjustment section formwork 2, a pier cap formwork 4, and a tie beam formwork 5.

[0043] The pier column formwork is constructed of steel, with adjacent forms connected by bolts and other fasteners. Standard sections are uniformly heighted, for example, 2.4 meters per standard section. The section where the pier column body connects to the tie beam is divided into tie beam sections, with the outer section being the tie beam section formwork 3. The outer section of the cap is the pier cap formwork 4. The remaining section of the pier column formwork is first divided using standard section formwork 1, with the remaining section serving as adjustment section formwork 2.

[0044] When dividing the tie beam section formwork 3, the connection between the tie beam section formwork 3 and the tie beam section formwork 5 should be located at the upper or lower part of the tie beam section formwork 3, and a certain height difference should be left between the top or bottom of the tie beam section formwork 3 and the upper end or lower end of the tie beam section formwork 3.

[0045] d. According to the template model divided in step c, make the tie beam section template 3, standard section template 1, adjustment section template 2, pier cap template 4 and tie beam template 5.

[0046] Among them, since the height of the standard section is consistent, the standard section can be used universally for multiple piers with the same cross-sectional dimensions.

[0047] e. Make formwork reinforcement beams 6 and tie beam reinforcement beams 9.

[0048] Among them, the structure of the template reinforcement beam 6 is as follows Figure 4 、 Figure 5 as well as Figure 6 As shown, the template reinforcement beam 6 is a long strip structure, and its total length is greater than the side length of the pier column cross section. A number of plug holes 8 are respectively opened at both ends of the template reinforcement beam 6, and the plug holes 8 are evenly distributed along the length direction of the template reinforcement beam 6.

[0049] Specifically, the formwork reinforcement beam 6 includes two parallel first connecting rods 17 , which are channel steels. The two channel steels are arranged back to back, and the two first connecting rods 17 are connected to each other by a connecting plate 19 , so that a certain gap is left between the two first connecting rods 17 .

[0050] Since the ends of the template reinforcement beams 6 on two adjacent sides of the template cross each other during use, the template reinforcement beam 6 is divided into the first template reinforcement beam 6 and the second template reinforcement beam 6 according to the distance between the two first connecting rods 17. The distance between the two first connecting rods 17 in the first template reinforcement beam 6 is greater than or equal to the total thickness of the second template reinforcement beam 6. In this way, the end of the second template reinforcement beam 6 can be inserted into the gap between the two first connecting rods 17 of the first template reinforcement beam 6, which can improve the stability of the connection.

[0051] At the same time, a reinforcing rib 7 is provided parallel to the outer side of the formwork reinforcement beam 6. The length of the reinforcing rib 7 is less than that of the formwork reinforcement beam 6, and the center of the reinforcing rib 7 coincides with the center of the formwork reinforcement beam 6. The reinforcing rib 7 is also formed by two oppositely disposed channel steels connected by a connecting plate 19. The thickness of the reinforcing rib 7 is equal to that of the formwork reinforcement beam 6. The reinforcing rib 7 is fixed to the outer side of the formwork reinforcement beam 6 by welding, thereby improving the overall structural strength of the formwork reinforcement beam 6.

[0052] The structure of the tie beam reinforcement beam 9 is as follows Figure 7 、 Figure 8 as well as Figure 9 As shown, the tie beam reinforcement beam 9 is also formed by two oppositely disposed channel steels connected by a connecting plate 19. An angle steel is provided at each end of the tie beam reinforcement beam 9, and a tension hole 11 is provided in the angle steel. The axis of the tension hole 11 passes through the gap between the two channel steels. A corbel 10 is provided at one end of the tie beam reinforcement beam 9. The corbel 10 has a certain length and is perpendicular to the tie beam reinforcement beam 9. The corbel 10 has a plug hole 8, and the axis direction of the plug hole 8 is consistent with the length direction of the tie beam reinforcement beam 9.

[0053] The corbel 10 includes two parallel second connecting rods 18, which are connected to each other by a connecting plate 19. The thickness of the corbel 10 is less than or equal to the spacing between the two first connecting rods 17 in the first formwork reinforcement beam 6, so that the corbel 10 can be inserted into the gap between the two first connecting rods 17 in the first formwork reinforcement beam 6.

[0054] f. When constructing the bridge pier formwork, the formwork is installed from bottom to top, and each section of the formwork is reinforced by a reinforcement beam.

[0055] Among them Figure 10 As shown, horizontal formwork reinforcement beams 6 are installed around the standard section formwork 1 and the adjustable section formwork 2, with adjacent formwork reinforcement beams 6 connected by a tensioning device. Because some pier caps are connected to tie beams while others are not, horizontal formwork reinforcement beams 6 are installed around the pier cap formwork 4 of pier caps not connected to tie beams. The ends of adjacent formwork reinforcement beams 6 are interlocked and connected by a tensioning device.

[0056] like Figure 11As shown, as for the pier cap formwork 4 of the blocking cap connected to the tie beam, it is the same as the tie beam section formwork 3. First, a formwork reinforcement beam 6 is horizontally set on the outer side of the formwork on the three sides without the tie beam, and tie beam reinforcement beams 9 are vertically set on both sides of the end of the tie beam formwork 5. The corbel 10 is located at the lower end or the upper end of the tie beam reinforcement beam 9. The tensioning bolts 12 are respectively connected at both ends of the two tie beam reinforcement beams 9 through the tensioning holes 11. The two adjacent formwork reinforcement beams 6 and the formwork reinforcement beam 6 and the corbel 10 are plugged into each other and connected through a tensioning device.

[0057] g. Formwork construction and concrete pouring construction are carried out on the piers in sequence. When the pouring construction of one pier is completed, the formwork reinforcement beam 6, tie beam reinforcement beam 9, tie beam section formwork 3, standard section formwork 1, adjustment section formwork 2, pier cap formwork 4 and tie beam formwork 5 are removed to proceed with the construction of the next pier. The standard section formwork 1, formwork reinforcement beam 6 and tie beam reinforcement beam 9 can be reused. Some adjustment section formwork 2, pier cap formwork 4 and tie beam formwork 5 can also be reused if subsequent piers use formwork of the same shape and size. Whether the formwork can be reused can be determined in the BIM model.

[0058] like Figure 12 As shown, the tensioning device includes a fastening bolt 13, a pin with a hole 14 and a gasket with a hole 15. The pin with a hole 14 is inserted into the connecting holes 8 of two adjacent formwork reinforcement beams 6 or the connecting holes 8 of the corbels 10 on two adjacent formwork reinforcement beams 6 and the tie beam reinforcement beam 9. The fastening bolt 13 is used to pass through the through holes in the middle of the two pins with a hole 14 at the same time. The gasket with a hole 15 is set at the end of the fastening bolt 13 and the nut 16 is screwed on. By tightening the nut 16, the two formwork reinforcement beams 6 or the corbels 10 on the formwork reinforcement beam 6 and the tie beam reinforcement beam 9 are connected and tensioned.

[0059] Since a plurality of plug-in holes 8 are provided at the end of the formwork reinforcement beam 6, the distance between the two plug-in holes 8 of two adjacent formwork reinforcement beams 6 is within the adjustment range of the tensioning device, and the distance between the two plug-in holes 8 of adjacent formwork reinforcement beams 6 and the corbel 10 is also within the adjustment range of the tensioning device. When installing the tensioning device, two plug-in holes 8 that meet the spacing requirements are selected.

[0060] One end of the perforated gasket 15 is an arcuate surface, which fits the surface of the perforated pin 14 .

[0061] A reinforcement support is provided on the outer side of the inclined arc surface of the pier cap formwork 4. The outer side surface of the reinforcement support is a vertical surface, and the formwork reinforcement beam 6 is installed on the reinforcement support.

[0062] For the pier cap formwork 4 connected to the tie beam, the height of the reinforcement bracket is lower than the lower surface of the tie beam or higher than the upper surface of the tie beam.

[0063] When the tie beam is located at the lower part of the tie beam section formwork 3 or the pier cap formwork 4, the formwork reinforcement beam 6 is arranged above the tie beam; when the tie beam is located at the upper part of the tie beam section formwork 3 or the pier cap formwork 4, the formwork reinforcement beam 6 is arranged below the tie beam, so that the reinforcement beam is close to the middle position of the formwork, thereby improving the overall stability.

[0064] In order to facilitate the installation and disassembly of the template, the tie beam section template 3, the standard section template 1 and the adjustment section template 2 are all spliced ​​together by two types of templates: [-shaped and |-shaped.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A BIM-based bridge pier formwork construction method, characterized in that: The following steps are involved: a. Model the bridge piers according to the bridge design drawings to obtain a bridge pier model; b. Establish a pier column template model on the bridge pier column model; c. Segment the pier column formwork model into tie beam section formwork, standard section formwork, adjustment section formwork, pier cap formwork, and tie beam formwork; d. Make tie beam section templates, standard section templates, adjustment section templates, pier cap templates, and tie beam templates according to the template model divided in step c; e. Fabricate formwork reinforcement beams and tie beam reinforcement beams, with several insertion holes opened at both ends of the formwork reinforcement beams, and tension holes opened at both ends of the tie beam reinforcement beams. A corbel perpendicular to the tie beam reinforcement beam is provided on the side of one end of the tie beam reinforcement beam, and a insertion hole is opened on the corbel; f. During bridge pier formwork construction, the formwork is installed sequentially from bottom to top. Formwork reinforcement beams are horizontally installed around each standard section formwork, adjustment section formwork, and pier cap formwork not connected to the tie beam. Adjacent formwork reinforcement beams are connected via a tensioning device. Formwork reinforcement beams are horizontally installed on the outside of the tie beam section formwork and the pier cap formwork connected to the tie beam. Tie beam reinforcement beams are vertically installed on both sides of the end of the tie beam formwork. The brackets are located at the lower or upper end of the tie beam reinforcement beams. Tension bolts are connected at both ends of the two tie beam reinforcement beams through tensioning holes. Adjacent formwork reinforcement beams and the formwork reinforcement beams and the brackets are connected via tensioning devices. g. After the pier column casting construction is completed, the formwork reinforcement beams, tie beam reinforcement beams, tie beam section formwork, standard section formwork, adjustment section formwork, pier cap formwork and tie beam formwork shall be removed.

2. The BIM-based bridge pier formwork construction method according to claim 1 is characterized in that: The template reinforcement beam includes two first connecting rods arranged in parallel, and the two first connecting rods are connected to each other by a connecting plate. The template reinforcement beam is divided into a first template reinforcement beam and a second template reinforcement beam according to the spacing between the two first connecting rods. The spacing between the two first connecting rods in the first template reinforcement beam is greater than or equal to the total thickness of the second template reinforcement beam.

3. The BIM-based bridge pier formwork construction method according to claim 2 is characterized in that: The corbel includes two second connecting rods arranged in parallel, and the two second connecting rods are connected to each other through a connecting plate. The thickness of the corbel is less than or equal to the distance between the two first connecting rods in the first template reinforcement beam.

4. The BIM-based bridge pier formwork construction method according to claim 1, characterized in that: A reinforcing rib is arranged in parallel on one side of the template reinforcement beam, the length of the reinforcing rib is smaller than the length of the template reinforcement beam, and the center of the reinforcing rib coincides with the center of the template reinforcement beam.

5. The BIM-based bridge pier formwork construction method according to claim 1 is characterized in that: The tensioning device includes a fastening bolt, a pin with a hole and a gasket with a hole. The pin with a hole is respectively inserted into the plug-in holes of two adjacent formwork reinforcement beams or the plug-in holes of the corbels on two adjacent formwork reinforcement beams and the tie beam reinforcement beam. The fastening bolt passes through the through-holes in the middle of the two pins with a hole at the same time. A gasket with a hole is set at the end of the fastening bolt and a nut is screwed on. By tightening the nut, the two formwork reinforcement beams or the corbels on the formwork reinforcement beam and the tie beam reinforcement beam are connected and tensioned.

6. The BIM-based bridge pier formwork construction method according to claim 1, characterized in that: A reinforcement support is provided on the outer side of the inclined arc surface of the pier cap template, the outer side surface of the reinforcement support is a vertical surface, and the template reinforcement beam is installed on the reinforcement support.

7. The BIM-based bridge pier formwork construction method according to claim 6, characterized in that: For the pier cap formwork connected to the tie beam, the height of the reinforcement bracket is lower than the lower surface of the tie beam or higher than the upper surface of the tie beam.

8. The BIM-based bridge pier formwork construction method according to claim 1 is characterized in that: The tie beam section template, standard section template and adjustment section template are all formed by splicing two types of templates: [-shaped and |-shaped.

9. The BIM-based bridge pier formwork construction method according to claim 1, characterized in that: When the tie beam is located at the bottom of the tie beam section formwork or the pier cap formwork, the formwork reinforcement beam is arranged above the tie beam; when the tie beam is located at the top of the tie beam section formwork or the pier cap formwork, the formwork reinforcement beam is arranged below the tie beam.

10. The BIM-based bridge pier formwork construction method according to claim 1, characterized in that: The template reinforcement beam and the tie beam reinforcement beam are both made of channel steel.

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