An integrally pullable small box beam hydraulic inner mold and mold closing method

Abstract

The invention relates to the field of bridge construction, and in particular to an integrally pull-out type small box girder hydraulic inner mold and a mold closing method, comprising an intermediate beam, a side mold, a bottom mold and a top mold. The invention has the advantages that when the box girder mold is disassembled, the top mold cylinder, the bottom mold cylinder and the side mold cylinder are sequentially moved and recovered into place by the top mold cylinder, the bottom mold cylinder and the side mold cylinder. At this time, the cross-sectional size of the entire box girder mold is smaller than the inner hole size of the box girder. Then, the box girder mold is lifted upward by a jack for a certain distance to push the steel wheel plate with the steel wheel to the bottom of the box girder mold, and then the box girder mold is placed on the steel wheel. The box girder mold and the steel wheel plate are sequentially pulled out from the inner hole of the box girder by a winch. The operation is convenient, and the fully hydraulic automatic template can be realized. There is no need to manually enter the inner hole of the box girder and the box girder inner mold for installation and disassembly operations. After the box girder mold is closed, it can be pulled out from the cross section of the inner hole of the box girder as a whole, thereby reducing the labor intensity of workers, reducing safety risks, and greatly saving construction time.

Description

Technical Field

[0001] The invention relates to the field of bridge construction, in particular to an integrally pullable small box girder hydraulic inner mold and a mold closing method. Background Art

[0002] For the casting of prefabricated small box girders with a span of more than 25m, a pull-out inner mold is currently used. The mold can only be pulled out in two parts, and cannot be pulled out as a whole. In addition, the installation and disassembly of the box girder formwork requires manual entry into the narrow inner mold space for installation and disassembly operations, which is very inconvenient. At the same time, due to the high temperature of the inner mold, it will have adverse effects on the workers' health. Summary of the invention

[0003] The invention provides an integrally pull-out type small box girder hydraulic inner mold and a mold closing method, so as to overcome the problem that the box girder template assembly and disassembly in the prior art requires manual entry into a narrow inner mold space for assembly and disassembly operations, which is very inconvenient to operate.

[0004] The present invention adopts the following technical scheme: an integral pull-out type small box beam hydraulic inner mold, comprising an intermediate beam, a side mold, a bottom mold and a top mold, wherein the side molds and the bottom molds are symmetrically arranged on both sides of the intermediate beam, and a top mold is arranged directly above the upper cross beam of the intermediate beam;

[0005] The side formwork, bottom formwork and top formwork are all movably arranged outside the middle beam. When the side formwork, bottom formwork and top formwork are completely moved outward and unfolded, the side formwork, bottom formwork and top formwork are connected to each other to form an inner formwork of a box beam with an isosceles trapezoidal structure.

[0006] The side formwork is slidably installed on both sides of the middle beam, and a plurality of side formwork cylinders are connected to the surface of one side of the side formwork close to the middle beam, and the side formwork cylinders are fixed on the upper crossbeam;

[0007] The bottom surface of the top mold plate is connected to a plurality of top mold oil cylinders fixed on the upper cross beam, and the top mold plate is installed directly above the upper cross beam so as to be movable up and down by the top mold oil cylinders;

[0008] The bottom template is rotatably installed on both sides of the middle beam, one side of the bottom template is hinged to the lower crossbeam of the middle beam, and the other side of the bottom template is rotatably connected to the upper crossbeam of the middle beam through the bottom template support mechanism;

[0009] The bottom mold support mechanism includes a bottom mold support connecting rod, a coupling block and a mounting plate. The two ends of the bottom mold support connecting rod are respectively hinged to the bottom mold plate and the coupling block. The coupling block is slidably arranged on the mounting plate, and the mounting plate is fixed between the lower beam and the upper beam.

[0010] As a further improvement, the connecting surfaces between the side templates, the bottom template and the top template are cut into an angle of 45 degrees.

[0011] As a further improvement, limit blocks are provided on the 45-degree cross-sections on the top template and the two bottom templates, and corresponding limit grooves compatible with the limit blocks are provided on the 45-degree cross-sections on the two side templates. When the top template, the bottom template and the side templates are fully unfolded and connected to each other, the limit blocks are respectively embedded in the limit grooves.

[0012] As a further improvement, the bottom mold support mechanism also includes a bottom mold cylinder and a slide groove. The top of the coupling block is connected to the bottom mold cylinder fixed on the upper cross beam, and the coupling block is slidably arranged in the slide groove on the mounting plate through the bottom mold cylinder.

[0013] As a further improvement, a side form guide rod is fixedly installed on the side surface of the side formwork close to the middle beam through a connecting plate, and the side form guide rod is slidably installed in a side form guide rod sleeve fixed on the middle beam.

[0014] As a further improvement, a plurality of support rods are connected between the lower crossbeam and the upper crossbeam.

[0015] As a further improvement, the length of a section of the box girder inner mold formed by the connection between the side mold, the bottom mold and the top mold to form an isosceles trapezoidal structure is m, and the box girder mold is formed by splicing several sections of the box girder inner molds together, and supports are fixed on the lower cross beams of the two sections of the box girder inner molds located at both ends of the box girder mold, respectively. The supports are in a 4 shape, and the protruding middle parts of the two supports extend outward from the end faces of the box girder mold respectively, and the inwardly recessed parts of the supports form an accommodating space, which is used to place the jack.

[0016] A mold closing method for an integrally pull-out small box beam hydraulic inner mold is characterized in that the method is carried out in the following steps: the first step is that when the box beam casting is completed and the box beam template on the inner hole of the box beam needs to be removed, a plurality of side mold cylinders, top mold cylinders and bottom mold cylinders are manually connected to an external hydraulic station through a quick-change joint; the second step is to first drive the top mold cylinder of each section of the box beam inner mold to move the top mold vertically downward and retract it into place through the external hydraulic station, as shown in the attached figure. Figure 8 As shown; the third step is to make the bottom mold oil cylinder of each section of the box beam inner mold drive the coupling block and the bottom mold support connecting rod to move upward, so that the bottom mold plate rotates inward and recovers to its position, as shown in the attached figure. Fig. 9 As shown; the fourth step is to finally make the side mold cylinder of the inner mold of each box beam section drive the side mold to move inward and recover to its position, and at the same time, the side mold guide rod on the side mold slides along the side mold guide rod sleeve, as shown in the attached Fig.10As shown; the fifth step, when the side formwork, bottom formwork and top formwork of each section of the box girder inner formwork are moved and recovered, the box girder formwork is 140mm away from the top surface of the box girder inner hole, and then the jack is placed in the accommodating space, and the box girder formwork is lifted up 120mm by the jack; the sixth step, push the steel wheel plate with steel wheels installed to the bottom of the box girder formwork, and then gently place the box girder formwork on the steel wheels through the jack; the seventh step, use the winch to pull the box girder formwork out of the box girder inner hole, and after each section of the box girder inner formwork is pulled out, remove the section of the box girder inner formwork from the box girder formwork; the eighth step, when all the box girder formworks are pulled out, take out the steel wheel plate from the box girder inner hole to complete the disassembly of the box girder formwork.

[0017] From the above description of the structure of the present invention, it can be seen that compared with the prior art, the present invention has the following advantages: when the box girder formwork needs to be disassembled, the top formwork, the bottom formwork and the side formwork cylinders are moved and recovered in place in turn by the top formwork cylinder, the bottom formwork cylinder and the side formwork cylinder. At this time, the cross-sectional size of the entire box girder formwork is smaller than the inner hole size of the box girder, and then the box girder formwork is lifted up a certain distance by a jack, and the steel wheel plate with steel wheels is pushed to the bottom of the box girder formwork, and then the box girder formwork is placed on the steel wheels, and the box girder formwork and the steel wheel plate are pulled out from the inner hole of the box girder in turn by a winch. The structure is simple and the operation is convenient, and the fully hydraulic automatic retractable formwork can be realized. There is no need to manually enter the inner hole of the box girder and the box girder inner mold for installation and disassembly operations. After the box girder formwork is retracted, it can be pulled out from the cross-section of the inner hole of the box girder as a whole, which reduces the labor intensity of workers, reduces safety risks, and greatly saves construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0019] Figure 2 It is a rear view structural schematic diagram of the present invention.

[0020] Figure 3 Schematic diagram of the connection structure between the middle beam and the side formwork.

[0021] Figure 4 This is a schematic diagram of the structure of the side formwork.

[0022] Figure 5 It is a schematic diagram of the structure of the top template.

[0023] Figure 6 Schematic diagram of the connection structure between the middle beam and the bottom formwork.

[0024] Figure 7 It is a schematic diagram of the structure of the present invention closely attached to the inner hole of the box beam.

[0025] Figure 8 This is a schematic diagram of the structure after the top template is moved and recovered.

[0026] Fig. 9 This is a schematic diagram of the structure after the bottom template is rotated and recovered.

[0027] Fig.10 Schematic diagram of the structure after the side formwork is moved and recovered DETAILED DESCRIPTION

[0028] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0029] As attached Figures 1 to 10 As shown, a hydraulic inner mold of an integrally pull-out small box beam comprises a middle beam 1, a side mold 2, a bottom mold 3 and a top mold 4. The side molds 2 and the bottom mold 3 are symmetrically arranged on both sides of the middle beam 1, and a top mold 4 is arranged directly above the upper cross beam 13 of the middle beam 1.

[0030] As attached Figures 1 to 2 As shown, the side formwork 2, bottom formwork 3 and top formwork 4 can be movably arranged on the outside of the middle beam 1. When the side formwork 2, bottom formwork 3 and top formwork 4 are completely moved outward and unfolded, the side formwork 2, bottom formwork 3 and top formwork 4 are connected with each other to form an inner formwork of a box beam with an isosceles trapezoidal structure.

[0031] As attached Figures 2 to 4 As shown, the side formwork 2 is slidably installed on both sides of the middle beam 1, and a plurality of side formwork cylinders 23 are connected to the side surface of the side formwork 2 close to the middle beam 1, and the side formwork cylinders 23 are fixed on the upper cross beam 13. A side formwork guide rod 21 is installed and fixed on the side surface of the side formwork 2 close to the middle beam 1 through a connecting plate 22, and the side formwork guide rod 21 is slidably installed in a side formwork guide rod sleeve 24 fixed on the middle beam 1. The side formwork cylinder 23 is used to push the side formwork 2 to move outward to unfold and assemble with the bottom formwork 3 and the top formwork 4 to form the casting inner mold of the box beam, or to move the side formwork 2 inward to recycle the side formwork 2, and at the same time, the side formwork guide rod 21 slides back and forth along the side formwork guide rod sleeve 24, and the guiding effect of the side formwork guide rod 21 can make the movement of the side formwork 2 more stable, and avoid the side formwork 2 from being offset in the moving direction due to its gravity during the movement, which affects the forming of the box beam casting inner mold.

[0032] As attached Figure 2 , Attachment Figure 5 and attached Figure 6 As shown, the bottom surface of the top template 4 is connected to the piston rods of several top template cylinders 42 fixed on the upper cross beam 13. The top template 4 is installed directly above the upper cross beam 13 so as to be movable up and down through the top template cylinders 42. The top template cylinders 42 are used to push the top template 4 to move vertically upward to be assembled with the bottom template 3 and the side template 2 to form the casting inner mold of the box beam, or to move the top template 4 vertically downward to recover the top template 4.

[0033] As attached Figure 2 and attached Figure 6 As shown, the bottom template 3 is rotatably installed on both sides of the middle beam 1, one side of the bottom template 3 is hinged to the lower cross beam 12 of the middle beam 1, and the other side of the bottom template 3 is rotatably connected to the upper cross beam 13 of the middle beam 1 through the bottom template support mechanism 5, and the bottom template support mechanism 5 includes a bottom template support connecting rod 51, a connecting shaft block 52 and a mounting plate 54, and the two ends of the bottom template support connecting rod 51 are respectively hinged to the bottom template 3 and the connecting shaft block 52, and the connecting shaft block 52 is slidably arranged on the mounting plate 54, and the mounting plate 54 is fixed between the lower cross beam 12 and the upper cross beam 13. It includes a bottom mold cylinder 53 and a slide groove 55. The top of the coupling block 52 is connected to the piston rod of the bottom mold cylinder 53 fixed on the upper cross beam 13. The coupling block 52 is slidably arranged in the slide groove 55 on the mounting plate 54 through the bottom mold cylinder 53. The bottom mold cylinder 53 is used to drive the coupling block 52 and the bottom mold support connecting rod 51 of the bottom mold support mechanism 5 to move up and down along the slide groove 55, so that the bottom mold plate 3 is rotated outward under the action of the bottom mold support connecting rod 51 to be assembled with the top mold plate 4 and the side mold plate 2 to form the casting inner mold of the box beam, or the bottom mold plate 3 is rotated inward to recover the bottom mold plate 3.

[0034] As attached Figure 2 , Attachment Figure 4 and attached Figure 5 As shown, the connecting surfaces between the side formwork 2, the bottom formwork 3 and the top formwork 4 are cut into a 45-degree angle, which ensures that the connecting seams between the side formwork 2, the bottom formwork 3 and the top formwork 4 are very small to avoid cement slurry leakage from the connecting seams and save cement slurry. It can also avoid sliding friction when the side formwork 2, the bottom formwork 3 and the top formwork 4 are separated, thereby reducing the friction between the bottom formwork 3 and the top formwork 4 and the side formwork 2 when they are recycled, which is convenient for rapid recycling. The top formwork 4 and the two bottom formworks 3 are provided with a 45-degree cut surface. The limit blocks 41 and the corresponding limit grooves 43 matched with the limit blocks 41 are arranged on the cross-sections at an angle of 45 degrees on the two side templates 2. When the top template 4, the bottom template 3 and the side templates 2 are fully unfolded and connected with each other, the limit blocks 41 are respectively embedded in the limit grooves 43, thereby improving the stability of the connection between the top template 4, the bottom template 3 and the side templates 2, reducing the risk of loose connection and displacement of the top template 4, the bottom template 3 and the side templates 2 during use, and at the same time ensuring the outer dimensions of the box girder inner mold, reducing the adjustment time of the box girder inner mold, and improving work efficiency.

[0035] As attached Figure 3 As shown, a plurality of support rods 11 are connected between the lower cross beam 12 and the upper cross beam 13, and the support rods 11 are used to strengthen the strength and load-bearing capacity of the lower cross beam 12 and the upper cross beam 13, thereby reducing the risk of the lower cross beam 12 and the upper cross beam 13 being broken by stress during use.

[0036] As attached Figure 1 and attached Figure 3As shown, the length of a box beam inner mold section formed by the connection between the side mold plate 2, the bottom mold plate 3 and the top mold plate 4 to form an isosceles trapezoidal structure is 6m, and the box beam template is formed by splicing a plurality of box beam inner mold sections, and the plurality of box beam inner mold sections are connected by bolts, so as to facilitate adjustment according to the actual length of the box beam to be produced, and supports 6 are respectively fixed on the lower cross beams 12 of the two box beam inner mold sections at both ends of the box beam template, and the supports 6 are in a 4-shape, and the protruding middle parts of the two supports 6 respectively extend outwardly from the end faces of the box beam template, so as to provide a force point for the jack to lift the box beam template upward, and the inwardly recessed parts of the supports 6 The accommodating space 61 is formed in the position, and the accommodating space 61 is used to place the jack. When the side templates 2, bottom templates 3 and top templates 4 of each section are moved and recovered, the cross-sectional size of the box beam template is smaller than the size of the inner hole 8 of the box beam after forming. Then the jack is placed in the accommodating space 61, and the box beam template is lifted up a certain distance by the jack, and then the steel wheel plate with steel wheels installed is pushed to the bottom of the box beam template, and then the box beam template is gently placed on the steel wheels, so that the sliding friction to be overcome when pulling the box beam template is converted into rolling friction, which is convenient for the subsequent use of the winch to pull the box beam template out of the inner hole 8 of the box beam, thereby improving work efficiency. The side mold cylinders 23 in the inner mold of each section of the box beam can be connected and conducted through a conduit, and the conduit can be connected to the external hydraulic station through a quick-change joint, so that the external hydraulic station can synchronously control the side mold cylinders 23. Similarly, the top mold cylinders 42 and the bottom mold cylinders 53 are each connected to the external hydraulic station through a conduit for control.

[0037] When the box beam casting is completed and the box beam formwork on the inner hole 8 of the box beam needs to be removed, the side form oil cylinders 23, the top form oil cylinders 42 and the bottom form oil cylinders 53 are manually connected to the external hydraulic station through the quick-change joints, and then the top form oil cylinders 42 of the inner form of each section of the box beam drive the top form 4 to move vertically downward and recover to the position through the external hydraulic station, and then the bottom form oil cylinders 53 of the inner form of each section of the box beam drive the coupling block 52 and the bottom form support connecting rod 51 of the bottom form support mechanism 5 to move upward along the slide groove 55, so that the bottom form 3 is rotated inwardly and recovered to the position under the action of the bottom form support connecting rod 51, and finally the side form oil cylinders 23 of the inner form of each section of the box beam are driven to rotate inwardly and recover to the position. The side formwork 2 is driven to move inward and recovered in place. At the same time, the side formwork guide rod 21 on the side formwork 2 slides along the side formwork guide rod sleeve 24, and the guiding effect of the side formwork guide rod 21 can make the movement of the side formwork 2 more stable, avoiding the side formwork 2 from being offset in the moving direction due to its gravity during the movement process, which affects the forming of the inner formwork for pouring the box girder. The above operation is the recovery process of the box girder formwork, which realizes the full hydraulic automatic recovery of the box girder formwork, and the box girder formwork expansion process is opposite to the recovery process of the box girder formwork. When the side formwork 2, bottom formwork 3 and top formwork 4 of the inner formwork of each section of the box girder are moved and recovered, the section of the entire box girder formwork is The surface size is smaller than the size of the inner hole 8 of the box beam after forming, and then the jack is placed in the accommodating space 61, and the box beam template is lifted up a certain distance by the jack, and then a plurality of steel wheel plates equipped with a plurality of steel wheels are pushed to the bottom of the box beam template, and then the box beam template is gently placed on the steel wheels, so that the sliding friction to be overcome when pulling the box beam template can be converted into rolling friction, which is convenient for the subsequent use of the winch to pull the box beam template out of the inner hole 8 of the box beam. The steel wheel is fixed on the steel wheel plate through the bearing seat, and when each section of the box beam inner mold is pulled out, the bolts at the connection of the box beam inner mold are unscrewed to pull the section of the box beam inner mold out of the box beam template. The box girder formwork can be disassembled from the upper part to avoid the box girder inner mold having an excessively long stroke and requiring a larger processing site, thereby saving site costs, and when disassembling a section of the box girder inner mold that has been pulled out, workers do not need to enter the box girder inner hole 8 and the box girder inner mold. Finally, when all the box girder formwork is pulled out, the steel wheel plate is taken out from the box girder inner hole 8 to complete the disassembly of the box girder formwork. The structure is simple and the operation is convenient, and the full hydraulic automatic retractable formwork can be realized. There is no need to manually enter the box girder inner hole 8 and the box girder inner mold for installation and disassembly operations. After the box girder formwork is retracted, it can be pulled out as a whole from the cross-section of the box girder inner hole 8, which reduces the labor intensity of workers, reduces safety risks, and greatly saves construction time.

[0038] A method for closing a hydraulic inner mold of an integrally pullable small box beam, characterized by being carried out in the following steps:

[0039] In the first step, when the box beam casting is completed and the box beam formwork on the inner hole 8 of the box beam needs to be removed, several side mold cylinders 23, top mold cylinders 42 and bottom mold cylinders 53 are manually connected to the external hydraulic station through quick-change joints;

[0040] In the second step, the top mold cylinder 42 of the inner mold of each box beam is driven by the external hydraulic station to move the top mold plate 4 vertically downward and retract it into place, as shown in the attached Figure 8 As shown;

[0041] In the third step, the bottom mold oil cylinder 53 of the inner mold of each box beam section drives the coupling block 52 and the bottom mold support connecting rod 51 of the bottom mold support mechanism 5 to move upward along the slide groove 55, so that the bottom mold plate 3 rotates inwardly under the action of the bottom mold support connecting rod 51 and is recovered in place, as shown in the attached figure. Fig. 9 As shown;

[0042] In the fourth step, the side mold oil cylinder 23 of the inner mold of each box beam section drives the side mold plate 2 to move inward and recover to its position, and at the same time, the side mold guide rod 21 on the side mold plate 2 slides along the side mold guide rod sleeve 24, as shown in the attached figure. Fig.10 As shown, the guiding effect of the side formwork guide rod 21 can make the movement of the side formwork 2 more stable, thereby preventing the side formwork 2 from being offset in its moving direction due to its gravity during the movement process, thereby affecting the forming of the inner formwork for casting the box beam;

[0043] Step 5: After the side templates 2, bottom templates 3 and top templates 4 of each section of the box beam inner template are moved and recovered, the cross-sectional size of the entire box beam template is smaller than the size of the box beam inner hole 8 after forming, and the box beam template is 140 mm away from the top surface of the box beam inner hole 8. Then, a jack is placed in the accommodating space 61, and the box beam template is lifted up by 120 mm using the jack.

[0044] The sixth step is to push the steel wheel plate with steel wheels installed to the bottom of the box beam template, and then gently place the box beam template on the steel wheel through the jack, so that the sliding friction to be overcome when pulling the box beam template can be converted into rolling friction;

[0045] The seventh step is to use a winch to pull the box beam template out of the box beam inner hole 8. After each section of the box beam inner mold is pulled out, the bolts at the connection of the box beam inner mold are unscrewed to remove the box beam inner mold from the box beam template, so as to avoid the box beam inner mold having a long stroke and requiring a larger processing site, thereby saving site costs, and when removing a section of the box beam inner mold that has been pulled out, workers do not need to enter the box beam inner hole 8 and the box beam inner mold.

[0046] In the eighth step, when the box girder formwork is completely pulled out, the steel wheel plate is taken out from the inner hole 8 of the box girder to complete the disassembly of the box girder formwork. The structure is simple and the operation is convenient. It can realize full hydraulic automatic retraction and extension of the formwork. There is no need to manually enter the inner hole 8 of the box girder and the box girder inner mold for installation and disassembly operations. After the box girder formwork is retracted, it can be pulled out from the cross-section of the inner hole 8 of the box girder as a whole, which reduces the labor intensity of workers, reduces safety risks, and greatly saves construction time.

[0047] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. An integral pull-out small box beam hydraulic inner mold, characterized in that: It includes a middle beam, a side formwork, a bottom formwork and a top formwork, wherein the side formwork and the bottom formwork are symmetrically arranged on both sides of the middle beam, and a top formwork is arranged just above the upper crossbeam of the middle beam; The side formwork, bottom formwork and top formwork are all movably arranged outside the middle beam. When the side formwork, bottom formwork and top formwork are completely moved outward and unfolded, the side formwork, bottom formwork and top formwork are connected to each other to form an inner formwork of a box beam with an isosceles trapezoidal structure. The side formwork is slidably installed on both sides of the middle beam, and a plurality of side formwork cylinders are connected to the surface of one side of the side formwork close to the middle beam, and the side formwork cylinders are fixed on the upper crossbeam; The bottom surface of the top mold plate is connected to a plurality of top mold oil cylinders fixed on the upper cross beam, and the top mold plate is installed directly above the upper cross beam so as to be movable up and down by the top mold oil cylinders; The bottom template is rotatably installed on both sides of the middle beam, one side of the bottom template is hinged to the lower crossbeam of the middle beam, and the other side of the bottom template is rotatably connected to the upper crossbeam of the middle beam through the bottom template support mechanism; The bottom mold support mechanism includes a bottom mold support connecting rod, a coupling block and a mounting plate, the two ends of the bottom mold support connecting rod are respectively hinged to the bottom mold plate and the coupling block, the coupling block is slidably arranged on the mounting plate, and the mounting plate is fixed between the lower crossbeam and the upper crossbeam; Limit blocks are provided on the cross-sections at an angle of 45 degrees on the top template and the two bottom templates, and limit grooves matched with the limit blocks are correspondingly provided on the cross-sections at an angle of 45 degrees on the two side templates. When the top template, the bottom template and the side templates are fully unfolded and connected with each other, the limit blocks are respectively embedded in the limit grooves. A side template guide rod is installed and fixed on the surface of the side of the side template close to the middle beam through a connecting plate, and the side template guide rod can be slidably installed in the side template guide rod sleeve fixed on the middle beam. The length of a section of the box girder inner mold with an isosceles trapezoidal structure formed by the mutual connection between the side template, the bottom template and the top template is 6m, and the box girder template is formed by splicing several sections of the box girder inner molds with each other, and supports are respectively fixed on the lower cross beams of the two sections of the box girder inner molds located at both ends of the box girder template, and the supports are in a 4-shape, and the protruding middle parts of the two supports extend outward from the end faces of the box girder template respectively, and the inwardly recessed parts of the supports form an accommodating space, and the accommodating space is used to place the jack.

2. The hydraulic inner mold of the integrally pull-out small box beam according to claim 1 is characterized in that: The connecting surfaces between the side template, the bottom template and the top template are all cut into 45 degree angles.

3. The hydraulic inner mold of the integrally pullable small box beam according to claim 1 is characterized in that: The bottom mold support mechanism also includes a bottom mold oil cylinder and a slide groove. The top of the coupling block is connected to the bottom mold oil cylinder fixed on the upper crossbeam, and the coupling block is slidably arranged in the slide groove on the mounting plate through the bottom mold oil cylinder.

4. The hydraulic inner mold of the integrally pullable small box beam according to claim 1 is characterized in that: A plurality of support rods are connected between the lower cross beam and the upper cross beam.

5. The mold closing method of the hydraulic inner mold of the integral pull-out small box beam according to claim 1 is characterized in that: Follow these steps: In the first step, when the box beam casting is completed and the box beam formwork on the inner hole of the box beam needs to be removed, several side mold cylinders, top mold cylinders and bottom mold cylinders are manually connected to the external hydraulic station through quick-change joints; The second step is to use the external hydraulic station to first drive the top mold cylinder of the inner mold of each section of the box beam to move the top mold vertically downward and retract it into place; The third step is to make the bottom mold oil cylinder of each section of the box beam inner mold drive the coupling block and the bottom mold supporting connecting rod to move upward, so that the bottom mold plate is rotated inward and recovered in place; Step 4: Finally, the side mold oil cylinder of the inner mold of each box beam section drives the side mold to move inward and recover to its position, and at the same time, the side mold guide rod on the side mold slides along the side mold guide rod sleeve; Step 5: After the side formwork, bottom formwork and top formwork of each section of the box beam inner formwork are moved and recovered, the box beam formwork is 140mm away from the top surface of the box beam inner hole, and then the jack is placed in the accommodating space, and the box beam formwork is lifted up 120mm by the jack; The sixth step is to push the steel wheel plate with steel wheels installed to the bottom of the box beam template, and then gently place the box beam template on the steel wheels by using a jack; Step 7: Use a winch to pull the box beam template out of the inner hole of the box beam. After each section of the box beam inner mold is pulled out, remove the box beam inner mold from the box beam template. Step 8. After all the box girder formwork is pulled out, remove the steel wheel plate from the inner hole of the box girder to complete the disassembly of the box girder formwork.

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