Double-amplitude cast-in-place box girder formwork and construction method

Abstract

The invention provides a double-amplitude cast-in-place box girder formwork which comprises a main girder system, a plurality of suspension systems and an inner side outer formwork system, the main girder system comprises two groups of main girders and transverse connecting pieces, each suspension system comprises a cross beam, a suspended beam connecting arm and a suspended beam, one end of the suspended beam connecting arm is fixedly connected with one end of the cross beam, and the other end of the suspended beam connecting arm is fixedly connected with the other end of the cross beam. The suspended beam is located below the main beam system, and one end of the suspended beam is hinged to the other end of the suspended beam connecting arm. The inner side outer formwork system is arranged below the main beam system in the length direction of the main beam system, and the other end of the suspended beam is detachably connected with the inner side outer formwork system. The invention further provides a construction method adopting the double-amplitude cast-in-place box girder formwork. The problem that in the prior art, a post-construction box girder formwork in a double-amplitude cast-in-place box girder cannot be built through a movable formwork is solved, the construction cost is saved, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction equipment, and in particular to a double-width cast-in-place box girder formwork. Background Art

[0002] When constructing cast-in-place concrete box girders, the commonly used formwork construction methods include full-frame scaffolding and mobile formwork construction. Full-frame scaffolding requires the construction of full-frame scaffolds at the bottom of the bridge. Although this method can provide good support for the formwork, it requires a large area of ​​hardening treatment on the lower part of the bridge, and has high requirements for the bearing capacity of the foundation. After the construction is completed, the scaffolds need to be removed hole by hole, and the on-site work volume is extremely large. Mobile formwork construction uses legs to support the main beam on the cast box beam and piers, and suspends the formwork on the main beam through a crossbeam. After the casting and curing are completed, the formwork moves to the left and right sides of the cast box beam to open the mold, realize the mold opening, and at the same time avoid the front pier, and then push the formwork forward as a whole through the jacking mechanism. This construction method does not require hardening of the ground under the bridge, avoids repeated erection and removal of supports, reduces construction costs and shortens construction period; however, for double-span cast-in-place box girders, the box girder constructed first can use the above-mentioned mobile formwork to build the template, while the box girder constructed later cannot be constructed using the above-mentioned mobile formwork due to the obstruction of the box girder constructed first. It is still necessary to use full-span supports to build the template, which is time-consuming and labor-intensive. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and to provide a double-width cast-in-place box girder formwork to solve the problem that the post-construction box girder formwork in the double-width cast-in-place box girder in the prior art cannot be constructed using a mobile formwork.

[0004] In order to solve the above problems, the present invention provides a double-width cast-in-place box beam formwork, characterized in that it includes a main beam system, a suspension system and an inner and outer formwork system;

[0005] The main beam system comprises two groups of main beams and transverse connecting members, the two groups of main beams are located in the same horizontal plane, and the two groups of main beams are axially parallel, and the two groups of main beams are connected by the transverse connecting members;

[0006] The suspension system has several groups, each group of the suspension system includes a crossbeam, a hanging beam connecting arm and a hanging beam, the crossbeam, the hanging beam connecting arm and the hanging beam are located on the same cross section, the crossbeam passes through and is fixed on the two groups of main beams, and the crossbeam is perpendicular to the main beam, one end of the hanging beam connecting arm is fixedly connected to one end of the crossbeam, the hanging beam is located below the main beam system, and one end of the hanging beam is hinged to the other end of the hanging beam connecting arm;

[0007] The inner outer formwork system is arranged below the main beam system along the length direction of the main beam system, and the other end of the hanging beam is detachably connected to the inner outer formwork system.

[0008] The above-mentioned double-width cast-in-place box beam formwork is characterized in that: the double-width cast-in-place box beam formwork also includes a box beam outer formwork (6), the box beam outer formwork (6) includes an outer formwork outer wing formwork, an outer formwork outer side wall formwork, an outer formwork bottom formwork, an outer formwork inner side wall formwork, an outer formwork inner wing formwork and a plurality of adjustable support rods, the outer formwork outer wing formwork, the outer formwork outer side wall formwork, the outer formwork bottom formwork, the outer formwork inner side wall formwork and the outer formwork inner wing formwork are sequentially connected to form an outer membrane of the precast box beam, the outer formwork outer wing formwork is connected to the outer formwork The outer side wall template of the mold is fixedly connected, the outer wing template of the outer mold and the outer side wall template of the outer mold are connected to the hanging beam connecting arm through an adjustable support rod, the outer side wall template of the outer mold is detachably connected to the outer mold bottom template, the outer mold bottom template is fixedly connected to the hanging beam, the outer mold bottom template is detachably connected to the inner side wall template of the outer mold, the outer mold inner side wall template is fixedly connected to the outer mold inner wing template, and the outer mold inner side wall template and the outer mold inner wing template are connected to the inner outer mold frame system through an adjustable support rod.

[0009] The above-mentioned double-width cast-in-place box girder formwork is characterized in that: the hanging beam connecting arm includes a vertical arm, an inclined arm, a folding cylinder and a folding cylinder leg, the upper end of the vertical arm is connected to the cross beam, and the vertical arm is located on the outside of the precast box girder flange, the lower end of the vertical arm is located below the precast box girder flange, one end of the inclined arm is fixedly connected to the lower end of the vertical arm, and the other end of the inclined arm is inclined toward the side close to the precast box girder, the other end of the inclined arm is hinged to the hanging beam, the folding cylinder leg is located below the other end of the inclined arm, and one end of the folding cylinder leg is fixedly connected to the inclined arm, one end of the folding cylinder is hinged to the other end of the folding cylinder leg, the other end of the folding cylinder is hinged to the hanging beam, and is used to push the hanging beam to rotate along the hinge axis of the hanging beam and the inclined arm.

[0010] The above-mentioned double-width cast-in-place box girder formwork is characterized in that: the hanging beam connecting arm also includes a reinforcing arm, the reinforcing arm is located below the cross beam, and the reinforcing arm and the vertical arm are inclined, one end of the reinforcing arm is fixedly connected to the cross beam, and the other end of the reinforcing arm is fixedly connected to the vertical arm.

[0011] The above-mentioned double-span cast-in-place box girder formwork is characterized in that: the inner outer formwork system includes an inner outer formwork small main beam, a small main beam supporting cylinder and the pier top trolley, the inner outer formwork small main beam is arranged below the inner flange of the precast box girder along the length direction of the precast box girder, the small main beam supporting cylinder is connected to the inner outer formwork small main beam, and is used to support the inner outer formwork small main beam on the pier top, and the pier top trolley is connected to the inner outer formwork small main beam, and is used to push the inner outer formwork small main beam through the hole along the pier top.

[0012] The above-mentioned double-span cast-in-place box girder formwork is characterized in that: the inner outer formwork system also includes an inner frame beam and an inner outer formwork transverse beam, the inner frame beam is connected to the inner outer formwork small main beam, and the inner frame beam is used to connect the inner outer formwork small main beam and the hanging beam, the inner outer formwork transverse beam is arranged below the inner outer formwork small main beam, and is used to adjust the lateral position of the inner outer formwork small main beam when passing through the hole.

[0013] The above-mentioned double-width cast-in-place box girder formwork is characterized in that: the inner outer mold sliding beam includes a base, a slide and an adjusting cylinder, the slide is installed on the base, one end of the adjusting cylinder is connected to the base, and the other end of the adjusting cylinder is connected to the slide, which is used to push the slide to move left and right on the base, the inner outer mold small main beam is arranged on the slide, and the inner outer mold small main beam is slidably connected to the slide.

[0014] The above-mentioned double-width cast-in-place box girder formwork is characterized in that: the double-width cast-in-place box girder formwork also includes a main beam rear support structure, which is arranged at the rear of the main beam system and is used to support the main beam system above the cast box girder.

[0015] The rear fulcrum structure of the main beam includes a guide rail, a transverse beam, a guide rail slide, a rotating shaft, a slide groove, a sliding bracket, a transverse cylinder, a main beam connecting beam and a longitudinal cylinder. The guide rail is laid on the cast box beam along the length direction of the cast box beam, the transverse beam is horizontally arranged above the cast box beam along the transverse direction of the cast box beam, the guide rail slide is arranged below the transverse beam, the transverse beam is slidably installed on the guide rail through the guide rail slide, the axis of the longitudinal cylinder is parallel to the guide rail, one end of the longitudinal cylinder is connected to the guide rail, and the other end of the longitudinal cylinder is connected to the guide rail slide and is used to push the guide rail slide to move along the guide rail, the slide groove is arranged on the transverse beam, the number of the slide grooves corresponds to the number of main beams, and The cam is configured to move the linkage set to the left and right sides of the vehicle frame, and the linkage set is configured to move the linkage set to the right and left sides of the vehicle frame. The cam is configured to move the linkage set to the right and left sides of the vehicle frame, and the linkage set is configured to move the linkage set to the right and left sides of the vehicle frame.

[0016] The above-mentioned double-width cast-in-place box girder formwork is characterized in that: the double-width cast-in-place box girder formwork also includes a first tie rod and a second tie rod, one end of the first tie rod is detachably connected to the cross beam, the other end of the first tie rod is detachably connected to an end of the hanging beam close to the hanging beam connecting arm, one end of the second tie rod is detachably connected to the cross beam, and the other end of the second tie rod is detachably connected to an end of the hanging beam close to the inner outer formwork system.

[0017] The present invention also discloses a construction method using the double-width cast-in-place box beam formwork, which is characterized by comprising the following steps:

[0018] Step 1: Before pouring the first span, the formwork is connected as a whole, and the second tie rod passes through the small main beam of the inner outer formwork and is connected to the hanging beam;

[0019] Step 2: After pouring, curing and tensioning are completed, the first tie rod and the second tie rod are released and the whole mold is dropped;

[0020] Step 3: Release the hanging connection between the inner frame beam and the cross beam, release the connection between the outer mold bottom template and the outer side wall template of the outer mold, and release the connection between the outer mold bottom template and the inner side wall template of the outer mold;

[0021] Step 4: The hanging beam drives the outer mold bottom template to rotate outward through the folding cylinder to clear the pier body;

[0022] Step 5: The inner outer mold small main beam carries the inner side wall template of the outer mold and the inner wing template of the outer mold to realize separate through-holes with the help of the pier top trolley;

[0023] Step 6: Hole the entire mold frame;

[0024] Step 7. After all holes are drilled, reconnect the template and lift it to the casting position to prepare for the next span casting.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] The present invention divides the movable formwork into two parts, namely the main body part and the inner outer formwork system. The main body part and the inner outer formwork system can realize separate through-holes. After through-holes, the outer membrane of the box beam to be cast can be quickly built through connection. The inner curtain is hoisted from the main body part to the outer membrane of the box beam to be cast, and the formwork can be quickly built to improve construction efficiency.

[0027] The invention is further described in detail below through the accompanying drawings and examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 It is a structural schematic diagram of the rear support structure of the rear end main beam of the main beam system on the bridge in an embodiment of the present invention.

[0030] Figure 2 It is a schematic diagram of the structure of the rear support structure of the rear end main beam of the main beam system in an embodiment of the present invention and the inner outer formwork system on the box beam after the mold is dropped.

[0031] Figure 3 Schematic diagram of the structure of the inner and outer mold frame system in an embodiment of the present invention.

[0032] Figure 4 It is a schematic diagram of the exploded cross-sectional structure of the inner outer mold transverse beam in an embodiment of the present invention.

[0033] Figure 5 It is a schematic structural diagram of the middle suspension system of the main beam system and the inner outer formwork system when they are connected to the bridge for mold closing in an embodiment of the present invention.

[0034] Figure 6 It is a schematic diagram of the structure when the middle suspension system of the main beam system and the inner outer mold frame system are connected and molded in an embodiment of the present invention.

[0035] Figure 7It is a structural schematic diagram of the embodiment of the present invention when the middle suspension system of the main beam system is disconnected from the inner outer formwork system and the formwork is opened on the bridge.

[0036] Figure 8 It is a structural schematic diagram of the embodiment of the present invention in which the middle suspension system of the main beam system is disconnected from the inner outer mold frame system and the mold is opened.

[0037] Description of reference numerals:

[0038] 1—main beam; 2—cross beam; 3—hanging beam connecting arm; 31—vertical arm;

[0039] 32—tilt arm; 33—folding cylinder; 34—folding cylinder outrigger; 35—strengthening arm;

[0040] 4—hanging beam; 5—inner and outer formwork frame system; 51—inner and outer formwork small main beam;

[0041] 52—small main beam supporting cylinder; 54—inner frame beam; 55—inner outer mold transverse beam;

[0042] 55-1—base; 55-2—sliding seat; 55-3—adjusting cylinder 6—box beam outer mold;

[0043] 61—outer wing template of the mold; 62—outer side wall template of the outer mold; 63—outer bottom template of the outer mold;

[0044] 64—side wall template inside the outer mold; 65—wing template inside the outer mold; 66—adjustable support rod;

[0045] 71 - guide rail; 72 - transverse beam; 73 - guide rail slide; 74 - rotating shaft;

[0046] 75—slideway; 76—sliding bracket; 77—transverse cylinder; 78—main beam connecting beam;

[0047] 81 - first pull rod 82 - second pull rod. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] like Figure 1 , Figure 5 and Figure 6As shown, for a double-span bridge, during construction, it is necessary to first cast the box girder on one side, and then cast the box girder on the other side. After the first box girder is cast, the space between the box girder cast later and the box girder cast earlier is extremely limited, and the existing mobile formwork cannot be used for construction at all. Therefore, the existing double-span bridges have to use the full-span scaffolding method when casting the rear box girder, which is not only time-consuming and labor-intensive, but also some site environments are not suitable for the full-span scaffolding method. In order to solve the difficulties in the prior art, the present embodiment provides a double-span cast-in-place box girder formwork, which includes a main beam system, a suspension system and an inner and outer formwork system 5; the main beam system includes two groups of main beams 1 and transverse connectors, the two groups of main beams 1 are located in the same horizontal plane, and the two groups of main beams 1 are axially parallel, and the two groups of main beams 1 are connected by the transverse connector; the suspension system has several groups, each group of the suspension system includes a crossbeam 2, a hanging beam connecting arm 3 and a hanging beam 4, the crossbeam 2, the hanging beam connecting arm 3 and The hanging beam 4 is located on the same cross section, the cross beam 2 passes through and is fixed on the two groups of main beams 1, and the cross beam 2 is perpendicular to the main beam 1, one end of the hanging beam connecting arm 3 is fixedly connected to one end of the cross beam 2, the hanging beam 4 is located below the main beam system, and one end of the hanging beam 4 is hinged to the other end of the hanging beam connecting arm 3; the inner external formwork frame system 5 is arranged below the main beam system along the length direction of the main beam system, and the other end of the hanging beam 4 is detachably connected to the inner external formwork frame system 5.

[0050] In this embodiment, the double-width cast-in-place box beam formwork divides the movable formwork into two parts, namely the main part and the inner outer formwork system 5. The main part includes the main beam system and the suspension system. The main beam system has similar structure and function to the existing movable formwork system, including the main beam, nose beam, front legs, middle legs, rear support, longitudinal movement mechanism, etc. The main beam and nose beam are supported on the bridge pier and the cast box beam through the front legs, middle legs and rear support, and the main beam system is pushed to move longitudinally through the hole through the longitudinal movement mechanism. The suspension system is connected to the main beam system and is used to install the outer membrane of the box beam; the longitudinal movement of the main beam system through the hole drives the longitudinal movement of the suspension system, and then drives the outer membrane of the box beam to move longitudinally through the hole; in order to adapt to the double-width cast-in-place box beam structure, the suspension system in this embodiment is different from the bridge-building machine in the prior art, and adopts a cantilever structure connected on one side; when passing through the hole, the hanging beam 4 can be reversed outward, and all the bottom molds of the outer membrane of the box beam can be reversed to the outside of the bridge pier, reserving the space required for the hole, so as to realize the hole. The inner outer formwork system 5 in this embodiment can realize a separate through-hole. During casting, one end of the hanging beam 4 is connected to the inner outer formwork system 5. The inner outer formwork system 5 is supported on the pier top by a supporting oil cylinder. The inner outer formwork system 5 is moved through the hole by the longitudinal moving mechanism of the outer formwork system. The longitudinal moving mechanism of the outer formwork system includes the pier top trolley and the inner outer formwork transverse moving beam 55. The pier top trolley is similar to the longitudinal moving mechanism of the movable formwork in the prior art. When the inner outer formwork system 5 moves longitudinally, one end of the pier top trolley acts on the pier top, and the other end pushes the inner outer formwork small main beam 51 of the inner outer formwork system 5 to move longitudinally through the hole along the inner outer formwork transverse moving beam 55 set on the pier top. Therefore, the double-width cast-in-place box beam formwork in this embodiment can effectively improve the construction efficiency through the separate through-holes and rapid splicing of the main part and the inner outer formwork system 5, and solve the problems of the difficulty of setting up the formwork for casting the double-width cast-in-place box beam in the prior art.

[0051] like Figures 5 to 8As shown, in this embodiment, the double-width cast-in-place box beam formwork further includes a box beam outer formwork (6), the box beam outer formwork (6) includes an outer formwork outer wing formwork 61, an outer formwork outer side wall formwork 62, an outer formwork bottom formwork 63, an outer formwork inner side wall formwork 64, an outer formwork inner wing formwork 65 and a plurality of adjustable support rods 66, the outer formwork outer wing formwork 61, the outer formwork outer side wall formwork 62, the outer formwork bottom formwork 63, the outer formwork inner side wall formwork 64 and the outer formwork inner wing formwork 65 are sequentially connected to form an outer membrane of the precast box beam, the outer formwork outer wing formwork 61 is fixed to the outer formwork outer side wall formwork 62 The outer mold outer wing template 61 and the outer mold outer side wall template 62 are connected to the hanging beam connecting arm 3 through an adjustable support rod 66, the outer mold outer side wall template 62 is detachably connected to the outer mold bottom template 63, the outer mold bottom template 63 is fixedly connected to the hanging beam 4, the outer mold bottom template 63 is detachably connected to the outer mold inner side wall template 64, the outer mold inner side wall template 64 is fixedly connected to the outer mold inner wing template 65, and the outer mold inner side wall template 64 and the outer mold inner wing template 65 are connected to the inner outer mold frame system 5 through an adjustable support rod 66.

[0052] like Figures 5 to 8 As shown, the hanging beam connecting arm 3 in this embodiment includes a vertical arm 31, an inclined arm 32, a folding cylinder 33 and a folding cylinder leg 34, the upper end of the vertical arm 31 is connected to the cross beam 2, and the vertical arm 31 is located on the outside of the flange of the precast box beam, and the lower end of the vertical arm 31 is located below the flange of the precast box beam, one end of the inclined arm 32 is fixedly connected to the lower end of the vertical arm 31, and the other end of the inclined arm 32 is inclined toward the side close to the precast box beam, the folding cylinder leg 34 is located below the other end of the inclined arm 32, and one end of the folding cylinder leg 34 is fixedly connected to the inclined arm 32, the other end of the inclined arm 32 is hinged to the hanging beam 4, one end of the folding cylinder 33 is hinged to the other end of the folding cylinder leg 34, and the other end of the folding cylinder 33 is hinged to the hanging beam 4, and is used to push the hanging beam 4 to rotate along the hinge axis between the hanging beam 4 and the inclined arm 32.

[0053] In this embodiment, the lower end of the vertical arm 31 is located below the flange of the precast box girder, and the inclined arm 32 is inclined toward the side close to the precast box girder; when the hanging beam 4 is folded outward through the hole, the center of gravity of the suspension system can be made as close as possible to directly below the center of the main beam system, thereby improving the stability of the hole.

[0054] like Figures 5 to 8 As shown, the hanging beam connecting arm 3 in this embodiment also includes a reinforcing arm 35, which is located below the cross beam 2, and the reinforcing arm 35 is inclined to the vertical arm 31, one end of the reinforcing arm 35 is connected to the cross beam 2, and the other end of the reinforcing arm 35 is fixedly connected to the vertical arm 31.

[0055] like Figure 2 and Figure 3 As shown, the inner outer formwork frame system 5 in this embodiment includes an inner outer formwork small main beam 51, a small main beam supporting cylinder 52 and the pier top trolley. The inner outer formwork small main beam 51 is arranged below the inner flange of the precast box beam along the length direction of the precast box beam. The small main beam supporting cylinder 52 is connected to the inner outer formwork small main beam 51, and is used to support the inner outer formwork small main beam 51 on the pier top. The pier top trolley is connected to the inner outer formwork small main beam 51, and is used to push the inner outer formwork small main beam 51 through the hole along the pier top.

[0056] The hole-passing principle of the inner outer formwork frame system 5 in this embodiment is similar to the hole-passing principle of the existing bridge-building machine. During the pouring process, the inner outer formwork small main beam 51 is supported on the pier top by the small main beam supporting cylinder 52; during the hole-passing process, the small main beam supporting cylinder 52 is retracted, and the inner outer formwork small main beam 51 falls onto the sliding beam set on the pier top, and the pier top trolley pushes the inner outer formwork small main beam 51 to move longitudinally along the sliding beam through the hole.

[0057] like Figure 3 and Figure 4 As shown, the inner outer mold frame system 5 in this embodiment also includes an inner frame beam 53 and an inner outer mold transverse beam 55, the inner frame beam 53 is connected to the inner outer mold small main beam 51, and the inner frame beam 53 is used to connect the inner outer mold small main beam 51 and the hanging beam 4, the inner outer mold transverse beam 55 is arranged below the inner outer mold small main beam 51, and is used to adjust the lateral position of the inner outer mold small main beam 51 when passing through the hole.

[0058] like Figure 3 and Figure 4 As shown, the inner outer mold sliding beam 55 includes a base 55-1, a slide 55-2 and an adjusting cylinder 55-3. The slide 55-2 is installed on the base 55-1, one end of the adjusting cylinder 55-3 is connected to the base 55-1, and the other end of the adjusting cylinder 55-3 is connected to the slide 55-2, which is used to push the slide 55-2 to move left and right on the base 55-1. The inner outer mold small main beam 51 is arranged on the slide 55-2, and the inner outer mold small main beam 51 is slidably connected to the slide 55-2.

[0059] In this embodiment, the slide 55-2 includes a slide body, and a guide wheel is arranged on the slide body. When the inner outer mold small main beam 51 falls onto the slide 55-2, the guide wheel is located on one side of the inner outer mold small main beam 51, and is used to limit the lateral position of the inner outer mold small main beam 51; and when the inner outer mold small main beam 51 moves longitudinally, it reduces unnecessary friction, dynamically limits the position, reduces the through-hole resistance, and provides the safety of the through-hole. The slide body is also provided with a hanging plate. When the inner outer mold small main beam 51 falls onto the slide 55-2, the hanging plate is located on the other side of the inner outer mold small main beam 51, the side opposite to the guide wheel. One end of the hanging plate is connected to the slide body, and the other end of the slide body extends to the inner outer mold small main beam 51, and is located above the bottom plate at the bottom of the inner outer mold small main beam 51, so as to form a hanging connection, effectively limit the position of the inner outer mold small main beam 51, prevent the inner outer mold small main beam 51 from falling out, and provide the safety of the through hole.

[0060] like Figure 1 and Figure 2 As shown, the double-width cast-in-place box beam formwork also includes a main beam rear fulcrum structure, which is arranged at the rear of the main beam system and is used to support the main beam system above the cast box beam. The main beam rear fulcrum structure includes a guide rail 71, a transverse beam 72, a guide rail slide 73, a rotating shaft 74, a slide chute 75, a sliding bracket 76, a transverse cylinder 77, a main beam connecting beam 78 and a longitudinal cylinder. The guide rail 71 is laid on the cast box beam along the length direction of the cast box beam. The transverse beam 72 is horizontally arranged above the cast box beam along the transverse direction of the cast box beam, the guide rail slide 73 is arranged below the transverse beam 72, the transverse beam 72 is slidably installed on the guide rail 71 through the guide rail slide 73, the axis of the longitudinal cylinder is parallel to the guide rail 71, one end of the longitudinal cylinder is connected to the guide rail 71, and the other end of the longitudinal cylinder is connected to the guide rail slide 73 and is used to push the guide rail slide 73 to move along the guide rail 71, the slide groove 7 5 is arranged on the transverse beam 72, the number of the slide grooves 75 corresponds to the number of the main beams 1, and the slide grooves 75 are located below the corresponding main beams 1, the sliding bracket 76 is located between two adjacent slide grooves 75, and the sliding bracket 76 is slidably installed on the transverse beam 72 along the left and right directions, one end of the transverse oil cylinder 77 is connected to the sliding bracket 76, and the other end of the transverse oil cylinder 77 is connected to the transverse beam 72, the axis of the transverse oil cylinder 77 is parallel to the length direction of the transverse beam 72, and the transverse oil cylinder 77 is used to push the sliding bracket 76 to move along the length direction of the transverse beam 72, the main beam connecting beam 78 is horizontally arranged between the two main beams 1, and the two ends of the main beam connecting beam 78 are respectively fixed to the corresponding main beams 1 on the same side by bolts, the rotating shaft 74 is arranged in the vertical direction, the upper end of the rotating shaft 74 is rotatably installed in the middle part of the main beam connecting beam 78, and the lower end of the rotating shaft 74 is fixed on the sliding bracket 76.

[0061] like Figure 5 and Figure 6 As shown, the double-span cast-in-place box girder formwork also includes a first tie rod 81 and a second tie rod 82, one end of the first tie rod 81 is detachably connected to the cross beam 2, the other end of the first tie rod 81 is detachably connected to an end of the hanging beam 4 close to the hanging beam connecting arm 3, one end of the second tie rod 82 is detachably connected to the cross beam 2, and the other end of the second tie rod 82 is detachably connected to an end of the hanging beam 4 close to the inner outer formwork system 5.

[0062] The present invention also discloses a construction method using the double-width cast-in-place box beam formwork, which is characterized by comprising the following steps:

[0063] Step 1: Before pouring the first span, the formwork is connected as a whole, and the second tie rod 82 passes through the inner outer formwork small main beam 51 and is connected to the hanging beam 4;

[0064] Step 2: After pouring, curing and tensioning are completed, the first tie rod 81 and the second tie rod 82 are released and the whole mold is dropped;

[0065] Step 3: Release the hanging connection between the inner frame beam 53 and the cross beam 2, release the connection between the outer mold bottom template 63 and the outer mold outer side wall template 62, and release the connection between the outer mold bottom template 63 and the outer mold inner side wall template 64;

[0066] Step 4: The hanging beam 4 drives the outer mold bottom template 63 to rotate outward to a position away from the pier body through the folding cylinder 33;

[0067] Step 5: The inner outer mold small main beam 51 carries the outer mold inner side wall template 64 and the outer mold inner wing template 65 to realize separate through-holes with the help of the pier top trolley;

[0068] Step 6: Hole the entire mold frame;

[0069] Step 7. After all holes are drilled, reconnect the template and lift it to the casting position to prepare for the next span casting.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-width cast-in-place box beam formwork, characterized in that: It includes a main beam system, a suspension system and an inner and outer formwork system (5); The main beam system comprises two groups of main beams (1) and transverse connecting members, the two groups of main beams (1) are located in the same horizontal plane, and the two groups of main beams (1) are arranged axially parallel, and the two groups of main beams (1) are connected via the transverse connecting members; The suspension system has several groups, each group of the suspension system comprises a cross beam (2), a hanging beam connecting arm (3) and a hanging beam (4), the cross beam (2), the hanging beam connecting arm (3) and the hanging beam (4) are located on the same cross section, the cross beam (2) passes through and is fixed on the two groups of main beams (1), and the cross beam (2) is perpendicular to the main beam (1), one end of the hanging beam connecting arm (3) is fixedly connected to one end of the cross beam (2), the hanging beam (4) is located below the main beam system, and one end of the hanging beam (4) is hinged to the other end of the hanging beam connecting arm (3); The inner outer formwork system (5) is arranged below the main beam system along the length direction of the main beam system, and the other end of the hanging beam (4) is detachably connected to the inner outer formwork system (5).

2. A double-width cast-in-place box beam formwork according to claim 1, characterized in that: The double-width cast-in-place box girder formwork also includes a box girder outer formwork (6), the box girder outer formwork (6) includes an outer mold outer wing formwork (61), an outer mold outer side wall formwork (62), an outer mold bottom formwork (63), an outer mold inner side wall formwork (64), an outer mold inner wing formwork (65) and a plurality of adjustable support rods (66), the outer mold outer wing formwork (61), the outer mold outer side wall formwork (62), the outer mold bottom formwork (63), the outer mold inner side wall formwork (64) and the outer mold inner wing formwork (65) are sequentially connected to form an outer membrane of the precast box girder, the outer mold outer wing formwork (61) is fixedly connected to the outer mold outer side wall formwork (62), the The outer mold outer wing template (61) and the outer mold outer side wall template (62) are connected to the hanging beam connecting arm (3) through an adjustable support rod (66); the outer mold outer side wall template (62) is detachably connected to the outer mold bottom template (63); the outer mold bottom template (63) is fixedly connected to the hanging beam (4); the outer mold bottom template (63) is detachably connected to the outer mold inner side wall template (64); the outer mold inner side wall template (64) is fixedly connected to the outer mold inner wing template (65); the outer mold inner side wall template (64) and the outer mold inner wing template (65) are connected to the inner outer mold frame system (5) through an adjustable support rod (66).

3. A double-width cast-in-place box beam formwork according to claim 2, characterized in that: The hanging beam connecting arm (3) comprises a vertical arm (31), an inclined arm (32), a folding cylinder (33) and a folding cylinder support leg (34); the upper end of the vertical arm (31) is connected to the cross beam (2), and the vertical arm (31) is located outside the flange of the precast box beam; the lower end of the vertical arm (31) is located below the flange of the precast box beam; one end of the inclined arm (32) is fixedly connected to the lower end of the vertical arm (31), and the other end of the inclined arm (32) is close to the side of the precast box beam. The folding cylinder leg (34) is located below the other end of the tilting arm (32), and one end of the folding cylinder leg (34) is fixedly connected to the tilting arm (32), and the other end of the tilting arm (32) is hinged to the hanging beam (4), one end of the folding cylinder (33) is hinged to the other end of the folding cylinder leg (34), and the other end of the folding cylinder (33) is hinged to the hanging beam (4) and is used to push the hanging beam (4) to rotate along the hinge axis between the hanging beam (4) and the tilting arm (32).

4. The double-width cast-in-place box beam formwork according to claim 3, characterized in that: The hanging beam connecting arm (3) further comprises a reinforcing arm (35), the reinforcing arm (35) being located below the cross beam (2), and the reinforcing arm (35) and the vertical arm (31) being arranged obliquely, one end of the reinforcing arm (35) being connected to the cross beam (2), and the other end of the reinforcing arm (35) being fixedly connected to the vertical arm (31).

5. The double-width cast-in-place box beam formwork according to claim 2, characterized in that: The inner outer formwork frame system (5) comprises an inner outer formwork small main beam (51), a small main beam supporting oil cylinder (52) and the pier top trolley. The inner outer formwork small main beam (51) is arranged below the inner flange of the precast box beam along the length direction of the precast box beam. The small main beam supporting oil cylinder (52) is connected to the inner outer formwork small main beam (51) and is used to support the inner outer formwork small main beam (51) on the pier top. The pier top trolley is connected to the inner outer formwork small main beam (51) and is used to push the inner outer formwork small main beam (51) through the hole along the pier top.

6. The double-width cast-in-place box beam formwork according to claim 5, characterized in that: The inner outer mold frame system (5) further comprises an inner frame beam (53) and an inner outer mold transverse beam (55); the inner frame beam (53) is connected to the inner outer mold small main beam (51), and the inner frame beam (53) is used to connect the inner outer mold small main beam (51) and the hanging beam (4); the inner outer mold transverse beam (55) is arranged below the inner outer mold small main beam (51) and is used to adjust the lateral position of the inner outer mold small main beam (51) when passing through a hole.

7. The double-width cast-in-place box beam formwork according to claim 1, characterized in that: The inner outer mold sliding crossbeam (55) comprises a base (55-1), a slide seat (55-2) and an adjusting oil cylinder (55-3); the slide seat (55-2) is mounted on the base (55-1); one end of the adjusting oil cylinder (55-3) is connected to the base (55-1); the other end of the adjusting oil cylinder (55-3) is connected to the slide seat (55-2) and is used to push the slide seat (55-2) to move left and right on the base (55-1); the inner outer mold small main beam (51) is arranged on the slide seat (55-2), and the inner outer mold small main beam (51) is slidably connected to the slide seat (55-2).

8. The double-width cast-in-place box beam formwork according to claim 1, characterized in that: The double-width cast-in-place box beam formwork further comprises a main beam rear fulcrum structure, which is arranged at the rear of the main beam system and is used to support the main beam system above the cast box beam. The main beam rear fulcrum structure comprises a guide rail (71), a transverse beam (72), a guide rail slide seat (73), a rotating shaft (74), a slide groove (75), a sliding bracket (76), a transverse cylinder (77), a main beam connecting beam (78) and a longitudinal cylinder. The guide rail (71) is laid on the cast box beam along the length direction of the cast box beam. The transverse beam (72) is arranged on the cast box beam. 2) is arranged horizontally along the transverse direction of the cast box beam and above the cast box beam, the guide rail slide (73) is arranged below the transverse beam (72), the transverse beam (72) is slidably installed on the guide rail (71) through the guide rail slide (73), the axis of the longitudinal oil cylinder is parallel to the guide rail (71), one end of the longitudinal oil cylinder is connected to the guide rail (71), the other end of the longitudinal oil cylinder is connected to the guide rail slide (73), and is used to push the guide rail slide (73) to move along the guide rail (71), and the slide groove (75) is arranged on the transverse beam (72), the number of the slide grooves (75) corresponds to the number of the main beams (1), and the slide grooves (75) are located below the corresponding main beams (1), the sliding bracket (76) is located between two adjacent slide grooves (75), and the sliding bracket (76) is installed on the transverse beam (72) in a sliding manner along the left and right directions, one end of the transverse oil cylinder (77) is connected to the sliding bracket (76), and the other end of the transverse oil cylinder (77) is connected to the transverse beam (72), and the axis of the transverse oil cylinder (77) is aligned with the length of the transverse beam (72). The two main beams (1) are parallel in the degree direction, and the transverse oil cylinder (77) is used to push the sliding bracket (76) to move along the length direction of the transverse beam (72). The main beam connecting beam (78) is horizontally arranged between the two main beams (1), and the two ends of the main beam connecting beam (78) are respectively fixed to the main beams (1) corresponding to the same side by bolts. The rotating shaft (74) is arranged in the vertical direction, and the upper end of the rotating shaft (74) is rotatably installed in the middle part of the main beam connecting beam (78), and the lower end of the rotating shaft (74) is fixed to the sliding bracket (76).

9. The double-width cast-in-place box beam formwork according to claim 5, characterized in that: The double-width cast-in-place box girder formwork further comprises a first tie rod (81) and a second tie rod (82), one end of the first tie rod (81) being detachably connected to the cross beam (2), the other end of the first tie rod (81) being detachably connected to an end of the hanging beam (4) close to the hanging beam connecting arm (3), one end of the second tie rod (82) being detachably connected to the cross beam (2), and the other end of the second tie rod (82) being detachably connected to an end of the hanging beam (4) close to the inner outer formwork system (5).

10. A construction method using the double-width cast-in-place box beam formwork as claimed in claim 9, characterized in that: The following steps are involved: Step 1: Before pouring the first span, the formwork is connected as a whole, and the second tie rod (82) passes through the inner outer formwork small main beam (51) and is connected to the hanging beam (4); Step 2: After pouring, curing and tensioning are completed, the first tie rod (81) and the second tie rod (82) are released and the whole is demoulded; Step 3: Release the hanging connection between the inner frame beam (53) and the cross beam (2), release the connection between the outer mold bottom template (63) and the outer mold outer side wall template (62), and release the connection between the outer mold bottom template (63) and the outer mold inner side wall template (64); Step 4: The hanging beam (4) drives the outer mold bottom template (63) to rotate outward to a position away from the pier body through the folding cylinder (33); Step 5: The inner outer mold small main beam (51) carries the outer mold inner side wall template (64) and the outer mold inner wing template (65) to achieve separate through-holes with the help of the pier top trolley; Step 6: Hole the entire mold frame; Step 7. After all holes are drilled, reconnect the template and lift it to the casting position to prepare for the next span casting.

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