An integrally horizontally moving and retractable hydraulic internal mold and its working method

Abstract

The present invention belongs to the technical field of precast box girders, and particularly relates to an integral transverse translation and contraction type hydraulic internal formwork and its working method. The internal formwork includes: a left top formwork and a right top formwork, which are symmetrically arranged with each other, and the cross-sections of the left top formwork and the right top formwork are both L-shaped structures; a left side formwork and a right side formwork, which are symmetrically arranged with each other, and the left side formwork is hinged to the left top formwork through a formwork hinge, and the right side formwork is hinged to the right top formwork through a formwork hinge; a bottom formwork, and the bottom formwork, the left side formwork, the right side formwork, the left top formwork and the right top formwork enclose an internal formwork with an inverted trapezoidal cross-section; the left side formwork presses on the left end of the bottom formwork, and the right side formwork presses on the right end of the bottom formwork; a base is arranged on the bottom formwork, and a reaction rod is arranged between the bottom end of the left side formwork and the base, and a reaction rod is arranged between the bottom end of the right side formwork and the base. This internal formwork can improve the construction efficiency; and has the effects of avoiding slurry leakage and slurry running.

Description

Technical Field

[0001] The present invention belongs to the technical field of precast box girders, and particularly relates to an integral transverse translation and shrinkage type hydraulic internal formwork and its working method. Background Art

[0002] A box girder is a type of beam in bridge engineering. It is hollow inside and has flanges on both upper sides, resembling a box, hence the name. Box girders made of reinforced concrete are divided into precast box girders and cast-in-place box girders. Among them, precast box girders are precast in an independent site and can be erected after the lower works are completed with the help of a bridge erecting machine, which has the advantages of accelerating the project progress and saving the construction period.

[0003] During the production process of precast box girders, a support internal formwork for forming the inner cavity of the box is usually used. In order to prevent the support internal formwork from deforming due to buoyancy during the concrete pouring process and seriously affecting the normal pouring of the box girder, the existing support internal formwork is large in volume and weight, and the structure is relatively complex. This instead makes the unfolding and shrinking process of the support internal formwork rather cumbersome, unable to achieve efficient and rapid demoulding. The demoulding process requires a large number of procedures, is time-consuming and laborious, and results in low construction efficiency.

[0004] Therefore, an improved technical solution is needed to address the above deficiencies in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide an integral transverse translation and shrinkage type hydraulic internal formwork and its working method to at least solve the above problems existing in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] An integral transverse translation and shrinkage type hydraulic internal formwork, the internal formwork includes:

[0008] A left top formwork and a right top formwork, the left top formwork and the right top formwork are symmetrically arranged, and the cross-sections of the left top formwork and the right top formwork are both L-shaped structures;

[0009] A left side formwork and a right side formwork, the left side formwork and the right side formwork are symmetrically arranged, the left side formwork and the left top formwork are hinged together through a formwork hinge, and the right side formwork and the right top formwork are hinged together through a formwork hinge;

[0010] A bottom formwork, the bottom formwork, the left side formwork, the right side formwork, the left top formwork and the right top formwork enclose an internal formwork with an inverted trapezoidal cross-section; and the left side formwork presses on the left end of the bottom formwork, and the right side formwork presses on the right end of the bottom formwork;

[0011] A base is provided on the bottom formwork. Reaction rods are provided between the bottom ends of the left formwork and the base, and reaction rods are also provided between the bottom ends of the right formwork and the base. A double-headed oil cylinder is provided on the base. The two ends of the double-headed oil cylinder are respectively connected to the left formwork and the right formwork. The double-headed oil cylinder is used to control the telescopic movement of the left formwork and the right formwork. A reaction guide rail is also provided on the base. The reaction guide rail is parallel to the bottom formwork, presses on the reaction rods, and is used to guide the reaction rods. The reaction guide rail is located below the double-headed oil cylinder.

[0012] For the overall horizontally moving and shrinking hydraulic internal formwork 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 formwork and the right formwork, and a reaction guide wheel is rotatably provided at the top end of each of the two reaction rods on the left and right sides. The reaction guide wheels are displaced in the reaction guide rail.

[0013] For the overall horizontally moving and shrinking hydraulic internal formwork as described above, preferably, a middle oil cylinder is provided above the double-headed oil cylinder. After the middle oil cylinder extends, it is used to jack up the joint part of the left top formwork and the right top formwork, and press down the reaction guide rail.

[0014] For the overall horizontally moving and shrinking hydraulic internal formwork as described above, preferably, a side oil cylinder is provided between the left formwork and the left top formwork, and a side oil cylinder is also provided between the right formwork and the right top formwork. The two side oil cylinders on the left and right sides are respectively used to control the unfolding and shrinking operations of the left top formwork and the right top formwork.

[0015] For the overall horizontally moving and shrinking hydraulic internal formwork as described above, preferably, the internal formwork further includes a jacking device. The jacking rod of the jacking device passes through the drainage hole reserved at the bottom of the precast box girder, and a roller is rotatably provided at the top end of the jacking rod. The roller abuts against the bottom of the bottom formwork.

[0016] For the overall horizontally moving and shrinking hydraulic internal formwork as described above, preferably, stiffening plates are provided inside the left top formwork with an L-shaped structure and the right top formwork with an L-shaped structure;

[0017] Force transfer plates are provided on the inner sides of the left formwork and the right formwork. The two ends of the double-headed oil cylinder are both connected to the force transfer plates;

[0018] A uniform pressure plate is provided at the top of the middle oil cylinder. The uniform pressure plate presses tightly on the joint part of the left top formwork and the right top formwork.

[0019] This application also provides a working method for an overall horizontally moving and shrinking hydraulic internal formwork. The working method uses the overall horizontally moving and shrinking hydraulic internal formwork as described above. The working method includes the installation and demoulding operations of the internal formwork;

[0020] The working method includes the following steps when installing the internal formwork:

[0021] Step 1: Extend the jack rods of all jacking devices upward. Pull the inner form in the retracted state along the rollers on the jack rods into the outer form of the precast box girder through an external traction mechanism. After the inner form moves into place, the jacking device controls the jack rods to descend so that the inner form is in place. At this time, the bottom form has been installed in place.

[0022] Step 2: Extend both ends of the double-headed oil cylinder outward. The reaction guide wheels at the ends of the reaction rods move outward along the reaction guide rails to install the left formwork and the right formwork in place.

[0023] Step 3: Extend the side oil cylinder on the right side to open the right top form relative to the right formwork, and install the right top form in place.

[0024] Step 4: Extend the side oil cylinder on the left side to open the left top form relative to the left formwork, and install the left top form in place.

[0025] Step 5: Extend the middle oil cylinder upward so that the middle oil cylinder abuts against the joint part of the left top form and the right top form.

[0026] For the working method of the overall horizontally moving and retractable hydraulic inner form as described above, preferably, when the inner form is demoulded, the working method includes the following steps:

[0027] Step 1: Lower and retract the middle oil cylinder.

[0028] Step 2: Retract the side oil cylinder on the left side to fold and close the left top form and separate it from the left top surface of the inner cavity of the box girder.

[0029] Step 3: Retract the side oil cylinder on the right side to fold and close the right top form and separate it from the right top surface of the inner cavity of the box girder.

[0030] Step 4: Retract the double-headed oil cylinder to drive the left formwork and the right formwork to move inward, so that both the left formwork and the right formwork are separated from the left and right abdominal plate surfaces of the inner cavity of the box girder.

[0031] Step 5: The jacking device extends the jack rods upward to separate the bottom form from the bottom surface of the inner cavity of the box girder, and complete the demoulding operation of the inner form.

[0032] Step 6: Pull out the inner form through an external traction device, and make the bottom form of the inner form move along the rollers on the jack rods to realize the overall extraction of the inner form.

[0033] Beneficial effects:

[0034] The force is transmitted to the base through the reaction rod to counteract the torsion of the left and right formworks caused by their own gravity and buoyancy during the grouting process, reducing the torque on the double-headed oil cylinder; and the two side formworks are pressed tightly by the reaction rod. At the same time, the two side reaction rods also indirectly press the two ends of the bottom formwork, further avoiding the leakage of slurry and running of slurry at the joint between the bottom formwork and the two side formworks; that is, the entire internal formwork structure of this application is not only more concise in structure, facilitating the improvement of construction efficiency, but also has a better effect of avoiding slurry leakage and running of slurry.

[0035] The guiding part on the reaction guide rail is arranged downward; the reaction rod is pressed tightly by the reaction guide rail, so as to form a stable structure among the two reaction rods, the reaction guide rail and the bottom formwork, enabling the bottom of the two side formworks to obtain better pressure, so that the two side formworks and the bottom formwork at the bottom of the internal formwork have a better anti-floating effect.

[0036] A middle oil cylinder is arranged to play a connecting role, so that a very stable overall structure is formed after the internal formwork is unfolded, as much as possible reducing the occurrence of slurry leakage and running of slurry. Brief Description of the Drawings

[0037] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:

[0038] Figure 1 is a schematic structural diagram of the internal formwork of an embodiment of the present invention;

[0039] Figure 2 is a schematic diagram of the demolding of the internal formwork of an embodiment of the present invention.

[0040] 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, stiffening plate; 8, side oil cylinder; 9, oil cylinder hinge seat; 10, force transmission plate; 11, double-headed oil cylinder; 12, reaction guide wheel; 13, reaction rod; 14, reaction guide rail; 15, base; 16, middle oil cylinder; 17, jacking device; 18, ejector rod. Detailed Description of the Embodiment

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0042] In the description of the present invention, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The terms "connected" and "coupled" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0044] According to a specific embodiment of the present invention, as Figure 1-2 shown, the present invention provides an integrally horizontally moving and retractable hydraulic internal mold. The internal mold includes:

[0045] A left top template 1 and a right top template 2, 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.

[0046] A left side template 4 and a right side template 5, 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 a template hinge 3, and the right side template 5 and the right top template 2 are hingedly connected to each other through a template hinge; in this embodiment, one template hinge 3 is arranged at one 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 one end where the right side template 5 and the right top template 2 are close to each other.

[0047] A bottom template 6, the bottom template 6, the left side template 4, the right side template 5, the left top template 1 and the right top template 2 enclose an internal mold with an inverted trapezoidal cross-section; and the left side template 4 presses on the left end of the bottom template 6, and the right side template 5 presses on the right end of the bottom template 6.

[0048] In this embodiment, one side of the L-shaped left top template 1 and the L-shaped right top template 2 together form the top of the inverted trapezoidal internal mold, the other side of the L-shaped left top template 1 and the left side template 4 together form the left side of the inverted trapezoidal internal mold, the other side of the L-shaped right top template 2 and the right side template 5 together form the right side of the inverted trapezoidal internal mold, and the bottom template 6 is used to form the bottom of the inverted trapezoidal internal mold.

[0049] Among them, the joint part of the left template 4 and the bottom template 6 is at the bottom left corner of the inner mold of the inverted trapezoidal structure, and the joint part of the right template 5 and the bottom template 6 is at the bottom right corner of the inner mold of the inverted trapezoidal structure. Since the joint position of the two templates is not only more likely to leak liquid, but also a pouring mark will be formed; this application avoids forming a template joint seam on the bottom surface of the inner mold of the inverted trapezoidal structure, which not only enables the bottom template 6 to form a complete bottom surface in the inner mold of the inverted trapezoidal structure.

[0050] Moreover, as is well known, during the pouring process, the greater the buoyancy force on the bottommost template, by pressing the left end of the bottom template 6 through the left template 4 and the right end of the bottom template 6 through the right template 5, it is also possible to prevent leakage and running of the slurry at the joint part of the bottom template 6 and the two side templates.

[0051] 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.

[0052] The force is transmitted to the base 15 through the reaction rod 13 to offset the torsion caused by the self - weight of the left and right templates 5 and the buoyancy force during the grouting process, reducing the torque on the double - head oil cylinder; and the two side templates are pressed tightly through the reaction rod 13. At the same time, the two side reaction rods 13 also indirectly press the two ends of the bottom template 6, thereby further preventing leakage and running of the slurry at the joint part of the bottom template 6 and the two side templates; that is, the entire inner template structure of this application is not only more concise in structure, facilitating the improvement of construction efficiency; but also has a better effect of preventing leakage and running of the slurry.

[0053] A double - head oil cylinder 11 is provided on the base 15. The two ends of the double - head oil cylinder 11 are respectively connected to the left template 4 and the right template 5. The double - head oil cylinder 11 is used to control the telescopic movement of the left template 4 and the right template 5. In an embodiment of this application, when the two ends of the double - head oil cylinder 11 are controlled to extend outwards, the left template 4 and the right template 5 expand outwards simultaneously; when the two ends of the double - head oil cylinder 11 retract inwards, the left template 4 and the right template 5 contract inwards simultaneously. That is, by setting the double - head oil cylinder 11, the expansion and retraction of the two side templates are more convenient to control, improving the efficiency of template installation and demoulding operations.

[0054] 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 presses on the reaction rod 13, and the reaction guide rail 14 is used to guide the reaction rod 13. The reaction guide rail 14 is located below the double - head oil cylinder 11.

[0055] In an embodiment of the present application, the guiding portion on the reaction force guide rail 14 is arranged downward; the reaction force guide rail 14 presses against the reaction force rod 13, so as to form a stable structure among the two reaction force rods 13, the reaction force guide rail 14 and the bottom formwork 6, enabling the bottoms of the side formworks to receive better pressure, and thus enabling the side formworks at both sides of the bottom of the inner formwork to have a better anti-floating effect with the bottom formwork 6.

[0056] The bottom ends of the two reaction force rods 13 on the left and right sides are respectively fixed to the bottom ends of the left side formwork 4 and the right side formwork 5, and a reaction force guide wheel 12 is rotatably arranged at the top end of each of the two reaction force rods 13 on the left and right sides, and the reaction force guide wheel 12 guides and displaces in the reaction force guide rail 14. In an embodiment of the present application, the reaction force guide wheel 12 is arranged at the end of the reaction force rod 13, so that the reaction force guide wheel 12 can slide along the reaction force guide rail 14, thereby facilitating the telescopic movement of the left side formwork 4 and the right side formwork 5 more conveniently, and being beneficial to improving the construction effect of the inner formwork.

[0057] In an embodiment of the present application, a reinforcing rib is arranged between the left reaction force rod 13 and the left side formwork 4, and a reinforcing rib is arranged between the right reaction force rod 13 and the right side formwork 5. The reinforcing rib is used to strengthen the connection structure strength between the reaction force rod and the formwork, so that the reaction force rod can better exert its reaction force function.

[0058] A middle oil cylinder 16 is arranged above the double-headed oil cylinder 11. After the middle oil cylinder 16 extends, it is used to jack up the joint part of the left top formwork 1 and the right top formwork 2, and press down the reaction force guide rail 14. In an embodiment of the present application, the middle oil cylinder 16 is located on the central axis of the inner formwork. The middle oil cylinder 16 is a multi-stage oil cylinder, which has two functions. First, it jacks up and presses the joint part of the left top formwork 1 and the right top formwork 2 upward, so as to avoid the situation of slurry leakage and slurry running at the joint part of the left top formwork 1 and the right top formwork 2; second, it presses the reaction force guide rail 14 downward in the opposite direction, so that the reaction force rod 13 can better play the role of pressing the side formworks and the bottom formwork 6; due to the simple structure of the whole inner formwork, by arranging the middle oil cylinder 16, it plays a role of connecting the upper and lower parts, enabling the inner formwork to form a very stable overall structure after unfolding, so as to minimize the occurrence of slurry leakage and slurry running.

[0059] A side oil cylinder 8 is arranged between the left side formwork 4 and the left top formwork 1, and a side oil cylinder 8 is also arranged between the right side formwork 5 and the right top formwork 2. The two side oil cylinders 8 on the left and right sides are respectively used to control the unfolding and contraction operations of the left top formwork 1 and the right top formwork 2. In an embodiment of the present application, the side oil cylinders 8 on the left and right sides contract, so that the two side top formworks rotate inward respectively with their respective formwork hinges as the origin, so as to contract inward; the side oil cylinders 8 on the left and right sides extend, so that the two side top formworks rotate outward respectively with their respective formwork hinges as the origin, so as to expand outward. In this embodiment, oil cylinder hinge seats 9 are arranged on both the left and right side formworks, and one end of the side oil cylinder 8 is hinged to the oil cylinder hinge seat 9.

[0060] The inner mold further includes a jacking device 17. The ejector rod 18 of the jacking device 17 penetrates through the drainage holes reserved at the bottom of the precast box girder, and a roller is rotatably arranged at the top end of the ejector rod 18, and the roller abuts against the bottom of the bottom formwork 6. In an embodiment of the present application, by providing the jacking device 17, it is more convenient to install and remove the inner mold.

[0061] Reinforcing plates 7 are arranged inside the left top formwork 1 and the right top formwork 2 of the L-shaped structure; In an embodiment of the present application, the reinforcing plates 7 are used to strengthen the structural strength of the left top formwork 1 and the right top formwork 2, and one ends of the two side cylinders 8 on the left and right sides are respectively connected to the reinforcing plates 7 of the left top formwork 1 and the right top formwork 2, so as to more conveniently control the unfolding and contraction operations of the left top formwork 1 and the right top formwork 2.

[0062] Force transmission plates 10 are arranged on the inner sides of the left side formwork 4 and the right side formwork 5, and both ends of the double-headed cylinder 11 are connected to the force transmission plates 10;

[0063] A pressure equalizing plate is arranged on the top of the middle cylinder 16, and the pressure equalizing plate presses against the joint part of the left top formwork 1 and the right top formwork 2. In an embodiment of the present application, setting the pressure equalizing plate can increase the contact area between the middle cylinder 16 and the joint part of the left top formwork 1 and the right top formwork 2, so that the middle cylinder 16 can better play its role in pressing the left top formwork 1 and the right top formwork 2.

[0064] The present application also provides a working method for the integral transverse movement and contraction type hydraulic inner mold. The working method uses the above-mentioned integral transverse movement and contraction type hydraulic inner mold, and the working method includes the installation and demolding operations of the inner mold;

[0065] When installing the inner mold, the working method includes the following steps:

[0066] Step 1, extend the ejector rods 18 of all the jacking devices 17 upward, and pull the inner mold in the contracted state into the outer mold of the precast box girder along the rollers on the ejector rods 18 through an external traction mechanism. After the inner mold moves into place, the jacking device 17 controls the ejector rods 18 to descend so that the inner mold is in place. At this time, the bottom formwork 6 has been installed in place;

[0067] Step 2, extend both ends of the double-headed cylinder 11 outward, and the reaction guide wheels 12 at the ends of the reaction rods 13 move outward along the reaction guide rails 14, so that the left side formwork 4 and the right side formwork 5 are installed in place;

[0068] Step 3, extend the side cylinder 8 on the right side, so that the right top formwork 2 opens relative to the right side formwork 5, and the right top formwork 2 is installed in place;

[0069] Step 4, extend the side cylinder 8 on the left side, so that the left top formwork 1 opens relative to the left side formwork 4, and the left top formwork 1 is installed in place;

[0070] Step 5: The middle oil cylinder 16 extends upward, so that the middle oil cylinder 16 abuts against the joint part of the left top formwork 1 and the right top formwork 2.

[0071] The working method includes the following steps when demolding the inner mold:

[0072] Step 1: The middle oil cylinder 16 descends and retracts;

[0073] Step 2: The side oil cylinder 8 on the left side contracts, so that the left top formwork 1 folds and retracts and disengages from the left top surface of the inner cavity of the box girder;

[0074] Step 3: The side oil cylinder 8 on the right side contracts, so that the right top formwork 2 folds and retracts and disengages from the right top surface of the inner cavity of the box girder;

[0075] Step 4: The double-headed oil cylinder 11 contracts, driving the left side formwork 4 and the right side formwork 5 to move inward, so that both the left side formwork 4 and the right side formwork 5 disengage from the left and right web surfaces of the inner cavity of the box girder;

[0076] Step 5: The jacking device 17 extends the jacking rod 18 upward, so that the bottom formwork 6 disengages from the bottom surface of the inner cavity of the box girder, completing the demolding operation of the inner mold;

[0077] Step 6: Pull out the inner mold through an external traction device, so that the bottom formwork 6 of the inner mold moves along the rollers on the jacking rod 18 to realize the overall extraction of the inner mold.

[0078] It can be understood that the above description is only exemplary, and the embodiments of the present application do not limit this.

[0079] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles 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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