Integral transverse moving contraction type hydraulic inner mold and working method thereof

Abstract

The invention belongs to the technical field of prefabricated box girders, and particularly relates to an integral transverse movement contraction type hydraulic inner mold and a working method thereof. The inner mold comprises a left top mold plate and a right top mold plate, the left top mold plate and the right top mold plate are symmetrically arranged, and the cross section of the left top mold plate and the cross section of the right top mold plate are each of an L-shaped structure. The left side template and the right side template are symmetrically arranged, the left side template is hinged to the left top template through a template hinge, and the right side template is hinged to the right top template through a template hinge; the bottom template, the left side template, the right side template, the left top template and the right top template are encircled to form an inner mold of which the cross section is of an inverted trapezoidal structure; the left side template is pressed at the left end part of the bottom template, and the right side template is pressed at the right end part of the bottom template; a base is arranged on the bottom template, a counter-force rod is arranged between the bottom end of the left template and the base, and a counter-force rod is arranged between the bottom end of the right template and the base. The internal mold can improve the construction efficiency; the device has the effect of avoiding mortar leakage and mortar runout.

Description

Technical Field

[0001] The invention belongs to the technical field of prefabricated box beams, and specifically relates to an integral transversely movable and retractable hydraulic inner mold and a working method thereof. Background Art

[0002] Box girder is a type of beam in bridge engineering. It is hollow inside and has flanges on both sides of the upper part, similar to a box, hence the name. Box girders of reinforced concrete structures are divided into prefabricated box girders and cast-in-place box girders. Among them, prefabricated box girders are box girders prefabricated in an independent site and can be erected after the lower part of the project is completed by combining with a bridge erection machine, which has the advantages of accelerating the progress of the project and saving construction time.

[0003] In the process of making prefabricated box girders, a supporting inner mold is usually used to form the inner cavity of the box. In order to prevent the supporting inner mold from deforming due to buoyancy during the pouring of concrete after it is expanded, which would seriously affect the normal pouring of the box girder, the existing supporting inner molds are large in size and weight, and have a complex structure. This in turn makes the expansion and contraction process of the supporting inner mold more complicated, making it impossible to achieve efficient and rapid demoulding. The demoulding process requires a large number of steps, which is time-consuming and labor-intensive, resulting in low construction efficiency.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0005] The purpose of the invention is to provide an integral transversely movable and retractable hydraulic inner mold and a working method thereof, so as to at least solve the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: An integral transversely movable and retractable hydraulic inner mold, the inner mold comprising: A left top template and a right top template, wherein the left top template and the right top template are symmetrically arranged, and the cross-sections of the left top template and the right top template are both L-shaped structures; A left side template and a right side template, wherein the left side template and the right side template are symmetrically arranged, the left side template and the left top template are hingedly connected to each other through a template hinge, and the right side template and the right top template are hingedly connected to each other through a template hinge; A bottom template, wherein the bottom template, the left template, the right template, the left top template and the right top template together form an inner template with an inverted trapezoidal cross section; and the left template is pressed on the left end of the bottom template, and the right template is pressed on the right end of the bottom template; A base is provided on the bottom template, a reaction rod is provided between the bottom end of the left template and the base, a reaction rod is provided between the bottom end of the right template and the base, a double-headed cylinder is provided on the base, both ends of the double-headed cylinder are respectively connected to the left template and the right template, the double-headed cylinder is used to control the telescopic movement of the left template and the right template, a reaction guide rail is also provided on the base, the reaction guide rail is parallel to the bottom template, the reaction guide rail is pressed on the reaction rod, and the reaction guide rail is used to guide the reaction rod, and the reaction guide rail is located at the lower part of the double-headed cylinder.

[0007] As for the integral transversely movable and retractable hydraulic inner mold as described above, preferably, the bottom ends of the two reaction rods on the left and right sides are respectively fixed to the bottom ends of the left and right templates, and the top ends of the two reaction rods on the left and right sides are rotatably provided with a reaction guide wheel, and the reaction guide wheel guides the displacement in the reaction guide rail.

[0008] As for the integral transversely movable and retractable hydraulic inner mold as described above, preferably, a middle cylinder is arranged above the double-headed cylinder, and after the middle cylinder is extended, it is used to push up the junction of the left top mold plate and the right top mold plate, and press down the reaction force guide rail.

[0009] As for the integral transversely movable and retractable hydraulic inner mold as described above, preferably, a side cylinder is provided between the left side mold and the left top mold, and a side cylinder is also provided between the right side mold and the right top mold. The two side cylinders on the left and right sides are respectively used to control the expansion and contraction operations of the left top mold and the right top mold.

[0010] As described above, the integral transversely movable and retractable hydraulic inner mold, preferably, the inner mold also includes a jacking device, the jacking rod of the jacking device passes through the drainage hole reserved at the bottom of the prefabricated box beam, and the top end of the jacking rod is rotatably provided with a roller, and the roller abuts against the bottom of the bottom template.

[0011] As for the integral transversely movable and retractable hydraulic inner mold as described above, preferably, a stiffening plate is provided inside the left top mold plate of the L-shaped structure and the right top mold plate of the L-shaped structure; The inner sides of the left template and the right template are both provided with force transmission plates, and both ends of the double-headed oil cylinder are connected to the force transmission plates; A pressure equalizing plate is arranged on the top of the middle oil cylinder, and the pressure equalizing plate is pressed tightly on the junction of the left top template and the right top template.

[0012] The present application also provides a working method of an integral transversely movable and retractable hydraulic inner mold, the working method using the integral transversely movable and retractable hydraulic inner mold described above, the working method including installation and demoulding operations of the inner mold; The working method comprises the following steps when the inner mold is installed: Step 1, the top rods of all the jacking devices are extended upward, and the inner mold in the contracted state is pulled into the outer mold of the prefabricated box beam along the rollers on the top rods through an external traction mechanism. After the inner mold moves into place, the jacking device controls the top rods to descend so that the inner mold is in place. At this time, the bottom mold has been installed in place; Step 2: Both ends of the double-headed oil cylinder extend outward, and the reaction guide wheel at the end of the reaction rod moves outward along the reaction guide rail, so that the left template and the right template are installed in place; Step 3, the side cylinder on the right side is extended to open the right top template relative to the right side template, and the right top template is installed in place; Step 4, the side cylinder on the left side is extended to open the left top template relative to the left side template, and the left top template is installed in place; Step 5, the middle oil cylinder extends upward so that the top of the middle oil cylinder contacts the junction of the left top template and the right top template.

[0013] The working method of the integral transverse shrinkage hydraulic inner mold as described above, preferably, comprises the following steps when the inner mold is demoulded: Step 1, the middle oil cylinder descends and retracts; Step 2: The side cylinder on the left side contracts to fold the left top template and separate it from the left top surface of the box beam inner cavity; Step 3: The side cylinder on the right side contracts to fold the right top template and separate it from the right top surface of the box beam inner cavity; Step 4: The double-headed oil cylinder contracts, driving the left template and the right template to move inward, so that the left template and the right template are separated from the left and right web surfaces of the inner cavity of the box beam; Step 5: The lifting device extends the ejector rod upward to separate the bottom template from the bottom plate surface of the inner cavity of the box beam, thus completing the inner mold demoulding operation; Step 6, pull out the inner mold through an external traction device, so that the bottom mold plate of the inner mold moves along the roller on the top rod to achieve the overall extraction of the inner mold.

[0014] Beneficial effects: The force is transmitted to the base through the reaction rod, so as to offset the torsion of the left and right side formworks caused by their own gravity and the buoyancy during the grouting process, and reduce the torque applied to the double-headed cylinder; and the formworks on both sides are pressed tightly by the reaction rod. At the same time, the reaction rods on both sides also indirectly press the two ends of the bottom formwork, so as to further avoid leakage and leakage of slurry at the junction of the bottom formwork and the formworks on both sides; that is, the entire inner formwork structure of the present application is not only more streamlined, which is convenient for improving construction efficiency; but also has a better effect of avoiding leakage and leakage of slurry.

[0015] The guide portion on the reaction guide rail is arranged downward; the reaction rod is pressed by the reaction guide rail, thereby forming a stable structure between the two reaction rods, the reaction guide rail and the bottom template, so that the bottoms of the templates on both sides are subjected to better pressure, so that the templates on both sides of the bottom of the inner mold and the bottom template have better anti-floating effect.

[0016] The middle oil cylinder is set to play a connecting role, so that after the inner mold is unfolded, a very stable overall structure is formed, so as to reduce the leakage and runaway of slurry as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the invention. The exemplary embodiments and descriptions of the invention are used to explain the invention and do not constitute an improper limitation on the invention. Among them: Figure 1 A schematic diagram of the structure of an inner mold for creating an embodiment of the present invention; Figure 2 A schematic diagram of inner mold demoulding is provided for creating an embodiment of the present invention.

[0018] In the figure: 1. Left top formwork; 2. Right top formwork; 3. Formwork hinge; 4. Left side formwork; 5. Right side formwork; 6. Bottom formwork; 7. Reinforced plate; 8. Side cylinder; 9. Cylinder hinge seat; 10. Force transfer plate; 11. Double-head cylinder; 12. Reaction guide wheel; 13. Reaction rod; 14. Reaction guide rail; 15. Base; 16. Middle cylinder; 17. Lifting device; 18. Push rod. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0020] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0022] According to the specific embodiments of the present invention, Figure 1-2 As shown, the present invention provides an integral transversely movable and retractable hydraulic inner mold, the inner mold comprising: The left top template 1 and the right top template 2 are symmetrically arranged with each other, and the cross sections of the left top template 1 and the right top template 2 are both L-shaped structures.

[0023] The left side template 4 and the right side template 5 are symmetrically arranged with each other, the left side template 4 and the left top template 1 are hingedly connected to each other through the template hinge 3, and the right side template 5 and the right top template 2 are hingedly connected to each other through the template hinge; in the present embodiment, one template hinge 3 is arranged at the end where the left side template 4 and the left top template 1 are close to each other, and the other template hinge is arranged at the end where the right side template 5 and the right top template 2 are close to each other.

[0024] The bottom template 6, the bottom template 6, the left template 4, the right template 5, the left top template 1 and the right top template 2 together form an inner mold with an inverted trapezoidal cross-section; and the left template 4 is pressed on the left end of the bottom template 6, and the right template 5 is pressed on the right end of the bottom template 6.

[0025] In this embodiment, the left top template 1 of the L-shaped structure and one side portion of the right top template 2 of the L-shaped structure together constitute the top of the inverted trapezoidal structure inner mold, the other side portion of the left top template 1 of the L-shaped structure and the left template 4 together constitute the left side portion of the inverted trapezoidal structure inner mold, the other side portion of the right top template 2 of the L-shaped structure and the right template 5 together constitute the right side portion of the inverted trapezoidal structure inner mold, and the bottom template 6 is used to constitute the bottom of the inverted trapezoidal structure inner mold.

[0026] Among them, the intersection of the left side template 4 and the bottom template 6 is at the left corner of the bottom of the inverted trapezoidal structure inner mold, and the intersection of the right side template 5 and the bottom template 6 is at the right corner of the bottom of the inverted trapezoidal structure inner mold. Since the intersection of the two templates is not only more prone to leakage, but also forms a casting mark; the present application avoids the formation of a template intersection seam on the bottom surface of the inverted trapezoidal structure inner mold, which not only enables the bottom template 6 to form a complete bottom surface in the inverted trapezoidal structure inner mold.

[0027] Moreover, as is well known, during the pouring process, the greater the buoyancy exerted on the template located at the bottom, the more leakage and runaway of slurry can be avoided at the junction of the bottom template 6 and the templates on both sides by pressing the left template 4 on the left end of the bottom template 6 and the right template 5 on the right end of the bottom template 6.

[0028] A base 15 is provided on the bottom template 6 , a reaction rod 13 is provided between the bottom end of the left template 4 and the base 15 , and a reaction rod 13 is provided between the bottom end of the right template 5 and the base 15 .

[0029] The force is transmitted to the base 15 through the reaction rod 13 to offset the torsion of the left and right side formworks 5 caused by their own gravity and buoyancy during the grouting process, thereby reducing the torque applied to the double-headed cylinder; and the two side formworks are pressed together through the reaction rod 13. At the same time, the two side reaction rods 13 also indirectly press the two ends of the bottom formwork 6, thereby further avoiding leakage and runaway of slurry at the junction of the bottom formwork 6 and the two side formworks; that is, the entire inner formwork structure of the present application is not only more streamlined, which is convenient for improving construction efficiency; but also has a better effect of avoiding leakage and runaway of slurry.

[0030] A double-headed oil cylinder 11 is provided on the base 15, and the two ends of the double-headed oil cylinder 11 are respectively connected to the left template 4 and the right template 5, and the double-headed oil cylinder 11 is used to control the telescopic movement of the left template 4 and the right template 5. In one embodiment of the present application, when the two ends of the double-headed oil cylinder 11 are controlled to extend outward, the left template 4 and the right template 5 are simultaneously expanded outward; when the two ends of the double-headed oil cylinder 11 are retracted inward, the left template 4 and the right template 5 are simultaneously retracted inward, that is, by providing the double-headed oil cylinder 11, the expansion and retraction of the templates on both sides are more easily controlled, thereby improving the efficiency of the template installation and demoulding operations.

[0031] A reaction guide rail 14 is also provided on the base 15 . The reaction guide rail 14 is parallel to the bottom template 6 . The reaction guide rail 14 is pressed on the reaction rod 13 and is used to guide the reaction rod 13 . The reaction guide rail 14 is located at the lower part of the double-headed cylinder 11 .

[0032] In one embodiment of the present application, the guide portion on the reaction guide rail 14 is set downward; the reaction rod 13 is pressed by the reaction guide rail 14, so that a stable structure is formed between the two reaction rods 13, the reaction guide rail 14 and the bottom template 6, so that the bottom of the two side templates can obtain better pressure, so that the two side templates at the bottom of the inner mold and the bottom template 6 have better anti-floating effect.

[0033] The bottom ends of the two reaction rods 13 on the left and right sides are respectively fixed to the bottom ends of the left template 4 and the right template 5, and the top ends of the two reaction rods 13 on the left and right sides are both rotatably provided with a reaction guide wheel 12, and the reaction guide wheel 12 guides the displacement in the reaction guide rail 14. In one embodiment of the present application, the reaction guide wheel 12 is provided at the end of the reaction rod 13, so that the reaction guide wheel 12 can slide along the reaction guide rail 14, thereby making it easier to telescopically move the left template 4 and the right template 5, which is beneficial to improving the construction effect of the inner mold.

[0034] In one embodiment of the present application, reinforcing ribs are provided between the left reaction rod 13 and the left formwork 4, and reinforcing ribs are provided between the right reaction rod 13 and the right formwork 5. The reinforcing ribs are used to strengthen the structural strength of the connection between the reaction rod and the formwork, so that the reaction rod can better exert its reaction effect.

[0035] A middle oil cylinder 16 is arranged above the double-head oil cylinder 11. After the middle oil cylinder 16 is extended, it is used to push up the intersection of the left top template 1 and the right top template 2, and press down the reaction guide rail 14. In one embodiment of the present application, the middle oil cylinder 16 is located on the central axis of the inner mold. The middle oil cylinder 16 is a multi-stage oil cylinder, which plays two roles. The first is to press upward on the intersection of the upper left top template 1 and the right top template 2, so as to avoid leakage and slurry running at the intersection of the upper left top template 1 and the right top template 2; the second is to press the reaction guide rail 14 downward, so that the reaction rod 13 can better play the role of pressing the templates on both sides and the bottom template 6; because the entire inner mold structure is streamlined, the middle oil cylinder 16 is arranged to play a role of connecting the upper and lower parts, so that a very stable overall structure is formed after the inner mold is unfolded, so as to minimize the occurrence of leakage and slurry running.

[0036] A side cylinder 8 is provided between the left side template 4 and the left top template 1, and a side cylinder 8 is also provided between the right side template 5 and the right top template 2. The two side cylinders 8 on the left and right sides are used to control the expansion and contraction of the left top template 1 and the right top template 2, respectively. In one embodiment of the present application, the side cylinders 8 on the left and right sides are contracted, so that the top templates on both sides rotate inward with their respective template hinges as the origin to shrink inward; the side cylinders 8 on the left and right sides are extended, so that the top templates on both sides rotate outward with their respective template hinges as the origin to expand outward. In this embodiment, a cylinder hinge seat 9 is provided on both the left and right side templates, and one end of the side cylinder 8 is hinged on the cylinder hinge seat 9.

[0037] The inner mold also includes a lifting device 17, a top rod 18 of the lifting device 17 passes through the drainage hole reserved at the bottom of the prefabricated box beam, and a roller is rotatably provided at the top of the top rod 18, and the roller abuts against the bottom of the bottom mold plate 6. In one embodiment of the present application, by providing the lifting device 17, the installation and withdrawal of the inner mold are more convenient.

[0038] A stiffening plate 7 is provided inside the left top formwork 1 and the right top formwork 2 of the L-shaped structure; in one embodiment of the present application, the stiffening plate 7 is used to strengthen the structural strength of the left top formwork 1 and the right top formwork 2, and one end of the two side cylinders 8 on the left and right sides are respectively connected to the stiffening plates 7 of the left top formwork 1 and the right top formwork 2, so as to facilitate the control of the expansion and contraction operations of the left top formwork 1 and the right top formwork 2.

[0039] A force transfer plate 10 is provided on the inner side of the left template 4 and the right template 5, and both ends of the double-headed oil cylinder 11 are connected to the force transfer plate 10; A pressure equalizing plate is provided on the top of the middle oil cylinder 16, and the pressure equalizing plate is pressed against the junction of the left top template 1 and the right top template 2. In one embodiment of the present application, the pressure equalizing plate can increase the contact area between the middle oil cylinder 16 and the junction of the left top template 1 and the right top template 2, so that the middle oil cylinder 16 can better play its role in pressing the left top template 1 and the right top template 2.

[0040] The present application also provides a working method of an integral transversely movable and retractable hydraulic inner mold, the working method using the above-mentioned integral transversely movable and retractable hydraulic inner mold, the working method including the installation and demoulding operations of the inner mold; The working method comprises the following steps when the inner mold is installed: Step 1, the top rods 18 of all the jacking devices 17 are extended upward, and the inner mold in the contracted state is pulled into the outer mold of the prefabricated box beam along the rollers on the top rods 18 through the external traction mechanism. After the inner mold moves into place, the jacking device 17 controls the top rods 18 to descend so that the inner mold is in place. At this time, the bottom mold plate 6 has been installed in place; Step 2, both ends of the double-headed oil cylinder 11 extend outward, and the reaction guide wheel 12 at the end of the reaction rod 13 moves outward along the reaction guide rail 14, so that the left template 4 and the right template 5 are installed in place; Step 3, the side cylinder 8 on the right side is extended to open the right top template 2 relative to the right side template 5, and the right top template 2 is installed in place; Step 4, the side oil cylinder 8 on the left side is extended to open the left top template 1 relative to the left side template 4, and the left top template 1 is installed in place; Step 5: the middle oil cylinder 16 extends upward so that the middle oil cylinder 16 abuts against the junction of the left top template 1 and the right top template 2.

[0041] The working method comprises the following steps when demoulding the inner mold: Step 1, the middle oil cylinder 16 is lowered and retracted; Step 2, the side cylinder 8 on the left side is contracted to fold the left top template 1 and separate it from the left top surface of the box beam inner cavity; Step 3, the side cylinder 8 on the right side contracts to fold the right top template 2 and separate it from the right top surface of the box beam inner cavity; Step 4, the double-headed oil cylinder 11 contracts, driving the left template 4 and the right template 5 to move inward, so that the left template 4 and the right template 5 are separated from the left and right web surfaces of the inner cavity of the box beam; Step 5, the lifting device 17 extends the push rod 18 upward to separate the bottom template 6 from the bottom plate surface of the inner cavity of the box beam, completing the inner mold demoulding operation; Step 6, the inner mold is pulled out by an external traction device, so that the bottom mold plate 6 of the inner mold moves along the roller on the top rod 18 to realize the overall extraction of the inner mold.

[0042] It should be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. An integral transversely movable and retractable hydraulic inner mold, characterized in that: The inner mold comprises: A left top template and a right top template, wherein the left top template and the right top template are symmetrically arranged, and the cross-sections of the left top template and the right top template are both L-shaped structures; A left side template and a right side template, wherein the left side template and the right side template are symmetrically arranged, the left side template and the left top template are hingedly connected to each other through a template hinge, and the right side template and the right top template are hingedly connected to each other through a template hinge; A bottom template, wherein the bottom template, the left template, the right template, the left top template and the right top template together form an inner template with an inverted trapezoidal cross section; and the left template is pressed on the left end of the bottom template, and the right template is pressed on the right end of the bottom template; A base is provided on the bottom template, a reaction rod is provided between the bottom end of the left template and the base, a reaction rod is provided between the bottom end of the right template and the base, a double-headed oil cylinder is provided on the base, and the two ends of the double-headed oil cylinder are respectively connected to the left template and the right template, and the double-headed oil cylinder is used to control the telescopic movement of the left template and the right template. The base is also provided with a reaction guide rail, which is parallel to the bottom template, pressed on the reaction rod, and used to guide the reaction rod, and is located at the lower part of the double-headed oil cylinder.

2. The integral transversely movable and retractable hydraulic inner mold according to claim 1 is characterized in that: The bottom ends of the two reaction rods on the left and right sides are respectively fixed to the bottom ends of the left and right templates, and the top ends of the two reaction rods on the left and right sides are rotatably provided with a reaction guide wheel, and the reaction guide wheel guides the displacement in the reaction guide rail.

3. The integral transversely movable and retractable hydraulic inner mold according to claim 2 is characterized in that: A middle oil cylinder is arranged above the double-head oil cylinder. After the middle oil cylinder is extended, it is used to push up the intersection of the left top template and the right top template, and press down the reaction force guide rail.

4. The integral transversely movable and retractable hydraulic inner mold according to claim 3 is characterized in that: A side cylinder is arranged between the left side template and the left top template, and a side cylinder is also arranged between the right side template and the right top template. The two side cylinders on the left and right sides are respectively used to control the expansion and contraction operations of the left top template and the right top template.

5. The integral transversely movable and retractable hydraulic inner mold according to claim 4 is characterized in that: The inner mold also includes a jacking device, a jacking rod of the jacking device passes through a drainage hole reserved at the bottom of the prefabricated box beam, and a roller is rotatably provided on the top end of the jacking rod, and the roller abuts against the bottom of the bottom template.

6. The integral transversely movable and retractable hydraulic inner mold according to claim 5 is characterized in that: A stiffening plate is provided inside the left top formwork of the L-shaped structure and the right top formwork of the L-shaped structure; The inner sides of the left template and the right template are both provided with force transmission plates, and both ends of the double-headed oil cylinder are connected to the force transmission plates; A pressure equalizing plate is arranged on the top of the middle oil cylinder, and the pressure equalizing plate is pressed tightly on the junction of the left top template and the right top template.

7. A working method of an integral transversely movable and retractable hydraulic inner mold, characterized in that: The working method uses the integral transversely movable and retractable hydraulic inner mold according to claim 6, and the working method includes the installation and demoulding operations of the inner mold; The working method comprises the following steps when the inner mold is installed: Step 1, the top rods of all the jacking devices are extended upward, and the inner mold in the contracted state is pulled into the outer mold of the prefabricated box beam along the rollers on the top rods through an external traction mechanism. After the inner mold moves into place, the jacking device controls the top rods to descend so that the inner mold is in place. At this time, the bottom mold has been installed in place; Step 2: Both ends of the double-headed oil cylinder extend outward, and the reaction guide wheel at the end of the reaction rod moves outward along the reaction guide rail, so that the left template and the right template are installed in place; Step 3, the side cylinder on the right side is extended to open the right top template relative to the right side template, and the right top template is installed in place; Step 4, the side cylinder on the left side is extended to open the left top template relative to the left side template, and the left top template is installed in place; Step 5, the middle oil cylinder extends upward so that the top of the middle oil cylinder contacts the junction of the left top template and the right top template.

8. The working method of the integral transversely movable and retractable hydraulic inner mold according to claim 7 is characterized in that: The working method comprises the following steps when the inner mold is demoulded: Step 1, the middle oil cylinder descends and retracts; Step 2: The side cylinder on the left side contracts to fold the left top template and separate it from the left top surface of the box beam inner cavity; Step 3: The side cylinder on the right side contracts to fold the right top template and separate it from the right top surface of the box beam inner cavity; Step 4: The double-headed oil cylinder contracts, driving the left template and the right template to move inward, so that the left template and the right template are separated from the left and right web surfaces of the inner cavity of the box beam; Step 5: The lifting device extends the ejector rod upward to separate the bottom template from the bottom plate surface of the inner cavity of the box beam, thus completing the inner mold demoulding operation; Step 6, pull out the inner mold through an external traction device, so that the bottom mold plate of the inner mold moves along the roller on the top rod to achieve the overall extraction of the inner mold.

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