A self-propelled preloading device and preloading method suitable for cast-in-place beam support

Abstract

The present invention discloses a self-propelled preloading device and a preloading method suitable for a cast-in-place beam support. The self-propelled preloading device includes a reaction beam support with a rectangular frame structure, a running system and a pressure system fixedly connected to the bottom end of the reaction beam support, a load distribution system connected to the pressure system, a locking system for positioning the reaction beam support, and a control system. The control system is used to control the running of the running system and to control the pressure system to drive the load distribution system to perform preloading of different load levels. The cast-in-place beam support preloading device disclosed by the present invention can automatically run and automatically grade load the cast-in-place beam support, and does not need to use preloading blocks or water bags for preloading, which can save a lot of manpower and material resources and improve construction efficiency.

Description

Technical Field

[0001] The invention relates to the field of bridge construction, in particular to a self-propelled preloading device suitable for a cast-in-place beam support and a preloading method thereof. Background Art

[0002] With the continuous updating of bridge construction technology, the construction process of cast-in-place beams is also constantly changing. Cast-in-place beams usually require cast-in-place brackets to be set up between two piers. In order to ensure that the cast-in-place bracket meets the construction requirements, the cast-in-place bracket needs to be pre-stressed to detect the stability of the bracket and eliminate the inelastic deformation of the bracket. The parameters that need to be adjusted are obtained through pre-stressing to ensure that the deformation of the bracket during concrete pouring is always kept within the allowable range.

[0003] At present, the traditional stent preloading methods include stacking preloading and water bag preloading.

[0004] Preloading is to preload the support by stacking preloading blocks (or sandbags) on the formwork. Although this achieves the effect of preloading the support, there are the following problems: (1) The construction period of hoisting preloading blocks (or sandbags) before and after preloading is long: Due to the large number of preloading blocks (or sandbags), they need to be hoisted many times, which takes a long time and prolongs the construction period. (2) Inconvenient transportation and high labor cost: When pouring the next beam section, the preloading blocks on the preloaded beam section must be transported to the next beam section. The transportation of preloading blocks (or sandbags) is very inconvenient, which increases the construction period and labor cost. (3) The load classification is uncontrollable: The support needs to be preloaded in stages, according to 60%, 80%, and 100% of the overall load. Due to the limitations of construction conditions, the preloading blocks (or sandbags) may be inaccurately graded or cannot be preloaded in stages. (4) Inconvenient adjustment: When preloading blocks (or sandbags), the bottom formwork and side formwork of the cast-in-place beam must be installed before loading. If the bracket needs to be strengthened or adjusted during the preloading process, it will affect the flatness of the formwork and even require the formwork to be reinstalled. (5) Serious material waste: In traditional technologies, most preloading blocks (or sandbags) cannot be transported to the next construction site, resulting in a large amount of material waste.

[0005] Water bag preloading is performed by placing a water bag on the formwork and filling it with water to simulate the construction load. Water bag preloading also has the following problems: (1) Water bag preloading is greatly affected by the water supply conditions at the construction site. For example, it is difficult to use this method of preloading when the water source is far away. (2) Due to the large difference in the specific gravity of water and reinforced concrete, it is difficult to accurately simulate the load according to the distribution of the actual construction load. (3) Water resources are seriously wasted. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a self-propelled preloading device and a preloading method suitable for a cast-in-place beam support, which does not require the use of preloading blocks or water bags for preloading, and the self-propelled preloading device can automatically travel and automatically load and preload the cast-in-place beam support in stages, which can save a lot of manpower and material resources and improve construction efficiency.

[0007] The technical solution of the present invention is:

[0008] A self-propelled preloading device suitable for a cast-in-place beam support, comprising a reaction beam support with a rectangular frame structure, a travel system and a pressure system fixedly connected to the bottom end of the reaction beam support, a load distribution system connected to the pressure system, a locking system for positioning the reaction beam support, and a control system;

[0009] The running system includes a driving motor, and a plurality of running wheel assemblies fixed to both sides of the bottom end of the reaction beam support and driven by the driving motor, wherein the plurality of running wheel assemblies are symmetrically arranged along the central axis of the reaction beam support;

[0010] The pressure system includes a plurality of hydraulic cylinders fixed to the bottom end of the reaction beam support, the plurality of hydraulic cylinders are divided into two rows, the two rows of hydraulic cylinders are symmetrical along the central axis of the reaction beam support, and each row of hydraulic cylinders is evenly distributed along the travel direction of the reaction beam support;

[0011] The load distribution system includes two rows of load distribution beams, a plurality of bottom plate pressure beams connected between the two rows of load distribution beams, and a web plate pressure beam connected to the outer end of each load distribution beam. The two rows of load distribution beams, the plurality of bottom plate pressure beams and the plurality of web plate pressure beams are all arranged horizontally. The two rows of load distribution beams are symmetrical along the running direction of the reaction beam bracket. The plurality of load distribution beams in each row of load distribution beams are parallel to each other. The two rows of hydraulic cylinders are located directly above the corresponding two rows of load distribution beams. The vertically downward piston rod of each hydraulic cylinder is hinged to a corresponding load distribution beam. In the two rows of load distribution beams, the inner end of one row of load distribution beams is arranged opposite to the inner end of the other row of load distribution beams. The inner ends of the two load distribution beams with opposite inner ends are respectively supported on the two ends of the corresponding bottom plate pressure beam, and the two ends of the bottom plate pressure beam are hinged to the inner ends of the corresponding two load distribution beams. The top end of each web plate pressure beam is hinged to the outer end of a corresponding load distribution beam.

[0012] The locking system comprises a shoulder beam fixed to the top of the reaction beam support and an anchor rod with the top fixed to the shoulder beam, and the bottom end of the anchor rod is pre-buried in the bridge pier;

[0013] The control system includes a speed sensor fixed on the running wheel group, a running control module, a pressure sensor fixed on the hydraulic cylinder, a pre-pressure control module, and a main control module; the running control module and the pre-pressure control module are both connected to the main control module, the speed sensor and the driving motor of the running system are both connected to the running control module, the pressure sensor and the hydraulic cylinder of the pressure system are both connected to the pre-pressure control module, the running control module collects the running speed through the speed sensor, and controls the running speed of the entire self-propelled pre-pressure device by controlling the driving motor of the running system, the pre-pressure control module collects the pressure signal of the hydraulic cylinder through the pressure sensor, and achieves the purpose of pre-pressure load graded control by controlling the pressure of the hydraulic cylinder, and the main control module centrally sends control commands to the running control module and the pre-pressure control module, so that the hydraulic cylinder of the entire self-propelled pre-pressure device cannot work when the running device is running, and the driving motor of the running system cannot work when the hydraulic cylinder is pre-pressured.

[0014] The reaction beam support is fixed with guide rails extending along the running direction of the reaction beam support on both side surfaces symmetrical along its axis, each guide rail is slidably connected with a counter roller, each counter roller is fixed with a hook for hanging and fixing the running rail, the running rail support is positioned on the template above the cast-in-place beam support, the length of the running rail is greater than the length of the self-propelled preloading device, and the running wheel group of the self-propelled preloading device moves along the running rail.

[0015] The length between the hinge point between the hydraulic cylinder and the load distribution beam and the hinge point between the load distribution beam and the web pressure beam is L1, and the length between the hinge point between the hydraulic cylinder and the load distribution beam and the hinge point between the load distribution beam and the bottom plate pressure beam is L2. The ratio of L1 to L2 is equal to the ratio of the weight of 1 / 2 bottom plate and web of the cast-in-place beam.

[0016] The top end of each web compression beam is hinged to the corresponding load distribution beam, the two rows of web compression beams connected to the outer ends of the two rows of load distribution beams are parallel to each other, and the ends of multiple web compression beams in each row are butt-jointed in sequence.

[0017] The bottom plate pressure beam is a horizontally arranged rectangular frame structure, and two relatively parallel sides of the bottom plate pressure beam are respectively hinged to two corresponding load distribution beams.

[0018] The locking system comprises a plurality of vertically arranged anchor rods, the top ends of the plurality of anchor rods are fixed on the shoulder beam, and the bottom ends of the plurality of anchor rods are pre-buried in the bridge pier.

[0019] The difference between the bottom end height of the web plate pressure beam and the bottom end height of the bottom plate pressure beam is equal to the thickness of the template above the cast-in-place beam support.

[0020] The main control module comprises a single chip microcomputer, a hydraulic pump station switch, a travel start and stop button and a display screen which are respectively connected to the single chip microcomputer.

[0021] A preloading method of a self-propelled preloading device suitable for a cast-in-place beam support, specifically comprising the following steps:

[0022] (1) First, set up the cast-in-place beam support and install the bottom formwork of the cast-in-place beam formwork, and lay the running track;

[0023] (2) Lift the components of the load distribution system onto the bottom formwork, place the load distribution beam on the bottom plate pressure beam and the web plate pressure beam according to the dimensions in the drawing, and hinge the three accordingly;

[0024] (3) Install the traveling system on the reaction beam support on the ground;

[0025] (4) Hoist the reaction beam bracket to the bottom mold of the template so that the running wheel group of the running system is supported on the upper surface of the running track;

[0026] (5) Install the connecting pin of the reaction beam bracket to connect the multiple sections of the reaction beam bracket into a whole;

[0027] (6) Install the control system and connect the power supply so that the reaction beam bracket can move along the running track;

[0028] (7) Fine-tune the position of the reaction beam bracket so that the pressure system on the bottom of the reaction beam bracket is aligned with the connection position of the load distribution beam, and install the hydraulic cylinder of the pressure system until all hydraulic cylinders are installed;

[0029] (8) Install the guide rail and the counter roller with hook on the reaction beam bracket;

[0030] (9) Install the hydraulic pipeline and other control parts, start the hydraulic control, and retract the hydraulic cylinder;

[0031] (10) Start the travel control to make the preloading device travel to the preloading position;

[0032] (11) Anchor the preloading device with the anchor rod of the locking system;

[0033] (12) Start the control system for preloading. Workers can set the ratio of the preloading load according to the standard until the maximum preloading load is reached, and unload after the preloading time is up;

[0034] (13) After the preloading is completed, the anchor rods of the locking system are removed, and the running system is started, so that the preloading device moves along the running track to the preloading position of the second segment cast-in-place beam support;

[0035] (14) Remove the running track on the template of the previous section, transfer it to the third section through the guide rail and lay it;

[0036] (15) Repeat steps 10 to 15 until all cast-in-place beam supports are pre-stressed.

[0037] While executing steps 1 to 12, the cast-in-place beam supports of the second and third sections are set up.

[0038] Advantages of the present invention:

[0039] (1) The construction period can be shortened. The self-propelled preloading device only needs to be assembled once, and no lifting equipment is required in the middle, nor does it need to be lifted many times for the preloading blocks or water bags, which can shorten the construction period.

[0040] (2) The present invention is easy to transport and can travel on the running track by itself, without spending a lot of manpower and material resources to transport the pre-pressed blocks or water bags.

[0041] (3) The present invention drives the load distribution system to perform preloading through a pressure system, and can control the load classification by adjusting the pressure to achieve graded preloading.

[0042] (4) The present invention can accurately simulate the load distribution under actual working conditions. The present invention can achieve accurate simulation of different load distributions by adjusting the torque relationship of the distribution system and the size of the hydraulic system pressure.

[0043] (5) The present invention is convenient for adjusting the cast-in-place beam support and the formwork after pre-compression, and the formwork has good flatness. During the construction of the present invention, only the bottom formwork of the formwork is installed. After the pre-compression is completed, there is no interference from other formworks when adjusting the cast-in-place beam support. After the adjustment is completed, other formworks are installed to ensure the flatness of the formwork.

[0044] (6) The present invention is a steel structure, which can be used in other project construction after one stage is completed, thus saving costs.

[0045] (7) The present invention can realize the common use of cast-in-place beam supports of different spans, and has good versatility.

[0046] (8) The present invention is highly safe. It only needs to be hoisted and assembled once during use, which reduces the risk of hoisting. In addition, the present invention performs walking transfer on the running track, which will not cause any impact on other equipment and lines next to the cast-in-place beam support, thus reducing the number of operators and the risk during construction. It is safer than traditional technologies.

[0047] (9) The present invention is easy to operate. The control system only requires one person to operate the hydraulic pump station switch or the travel start and stop button on the main control module. Even if an error occurs, there is a special safety control. The worker's skill requirements are low and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1It is a front view of the self-propelled preloading device of the present invention mounted on a cast-in-place beam support.

[0049] Figure 2 yes Figure 1 Enlarged view of part A.

[0050] Figure 3 It is a side view of the self-propelled preloading device of the present invention mounted on a cast-in-place beam support.

[0051] Figure 4 yes Figure 3 Enlarged view of part B in .

[0052] Figure 5 1 is a top view of the load distribution system of the present invention.

[0053] Figure 6 It is a side view of the load distribution system of the present invention.

[0054] Figure 7 It is a principle block diagram of the control system of the present invention. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] See Figure 1-Figure 4 , a self-propelled preloading device suitable for cast-in-place beam supports, comprising a reaction beam support 1 with a rectangular frame structure, a travel system 2 and a pressure system 3 fixedly connected to the bottom end of the reaction beam support, a load distribution system 4 connected to the pressure system 3, a locking system 5 for positioning the reaction beam support 1, and a control system 6;

[0057] The running system 2 includes a driving motor 21, and a plurality of running wheel assemblies 22 fixed to both sides of the bottom end of the reaction beam support 1 and driven by the driving motor 21. The plurality of running wheel assemblies 22 are symmetrically arranged along the central axis of the reaction beam support 1.

[0058] The pressure system 3 includes a plurality of hydraulic cylinders fixed to the bottom end of the reaction beam support 1, and the plurality of hydraulic cylinders are divided into two rows, the two rows of hydraulic cylinders are symmetrical along the central axis of the reaction beam support 1, and each row of hydraulic cylinders is evenly distributed along the running direction of the reaction beam support 1;

[0059] See Figure 5 and Figure 6The load distribution system 4 includes two rows of load distribution beams 41, a plurality of bottom plate pressure beams 42 connected between the two rows of load distribution beams 41, and a web plate pressure beam 43 connected to the outer end of each load distribution beam 41. The two rows of load distribution beams 41, the plurality of bottom plate pressure beams 42 and the plurality of web plate pressure beams 43 are all arranged horizontally. The two rows of load distribution beams 41 are symmetrical along the running direction of the reaction beam bracket 1. The plurality of load distribution beams 41 in each row of load distribution beams 41 are parallel to each other. The two rows of hydraulic cylinders are located directly above the corresponding two rows of load distribution beams 41. The vertically downward piston rod of each hydraulic cylinder is hinged to a corresponding load distribution beam 41. In the two rows of load distribution beams 41, the inner end of one row of load distribution beams 41 is arranged opposite to the inner end of the other row of load distribution beams 41. The bottom plate pressure beam 42 is a horizontally arranged rectangular frame structure. The inner ends of the two load distribution beams 41 with opposite inner ends are respectively supported on the corresponding bottom plate. On the relatively parallel sides of the pressure beam 42, and the relatively parallel sides of the bottom plate pressure beam 42 are respectively hinged to the inner ends of the corresponding two load distribution beams 41, the top end of each web pressure beam 43 is hinged to the outer end of a corresponding load distribution beam 41, the two rows of web pressure beams 43 connected to the outer ends of the two rows of load distribution beams 41 are parallel to each other, and the ends of multiple web pressure beams 43 in each row of web pressure beams 43 are connected in sequence; wherein, the difference between the bottom end height of the web pressure beam 43 and the bottom end height of the bottom plate pressure beam 42 is equal to the thickness of the formwork 8 above the cast-in-place beam support 7, the distance between the hinge point of the hydraulic cylinder and the load distribution beam 41 and the hinge point of the load distribution beam 41 and the web pressure beam 43 is L1, the distance between the hinge point of the hydraulic cylinder and the load distribution beam 41 and the hinge point of the load distribution beam 41 and the bottom plate pressure beam 42 is L2, and the ratio of L1 to L2 is equal to the ratio of the weight of 1 / 2 of the bottom plate and the web of the cast-in-place beam;

[0060] The locking system 5 includes a shoulder beam 51 fixed to the top of the reaction beam support 1 and four vertically arranged anchor rods 52. The top ends of the four anchor rods 52 are all fixed to the shoulder beam 51, and the bottom ends of the four anchor rods 52 are pre-buried in the bridge pier 10.

[0061] See Figure 7The control system 6 includes a speed sensor 61 fixed on the running wheel group, a running control module 62, a pressure sensor 63 fixed on the hydraulic cylinder, a pre-pressure control module 64, and a main control module 65; the main control module 65 includes a single-chip computer 651, a hydraulic pump station switch 652, a running start and stop button 653 and a display screen 654 connected to the single-chip computer 651 respectively; the running control module 62 and the pre-pressure control module 64 are connected to the single-chip computer 651 of the main control module, the speed sensor 61 and the driving motor 21 of the running system are connected to the running control module 62, the pressure sensor 63 and the hydraulic cylinder of the pressure system 3 are connected to the pre-pressure control module 64, and the running control module 62 collects the running speed through the speed sensor 61 and passes The travel speed of the entire self-propelled prestressing device is controlled by controlling the driving motor 21 of the travel system. The prestressing control module 64 collects the pressure signal of the hydraulic cylinder through the pressure sensor 63, and achieves the purpose of prestressing load graded control by controlling the pressure of the hydraulic cylinder. The hydraulic pump station switch 652 and the travel start and stop button 653 of the main control module are control inputs. The single-chip microcomputer 651 of the main control module centrally sends control commands to the travel control module 62 and the prestressing control module 64. The display screen 654 displays the travel speed of the travel system 2 and the load level of the pressure system 3 driving the load distribution system 4 in real time. The hydraulic cylinder of the entire self-propelled prestressing device cannot work when the hydraulic cylinder is prestressed. The driving motor 21 of the travel system cannot work when the hydraulic cylinder is prestressed.

[0062] Among them, the reaction beam support 1 is fixed with guide rails 11 extending along the running direction of the reaction beam support 1 on both sides of the symmetrical sides along the axis thereof (see Figure 4 ), each guide rail 11 is slidably connected with a counter roller 12, and each counter roller 12 is fixed with a hook 13 for hanging and fixing the running track 7. The running track 7 is supported and positioned on the template 9 above the cast-in-place beam bracket 8. The length of the running track 7 is greater than the length of the self-propelled preloading device. The running wheel group of the self-propelled preloading device moves along the running track 7. When the self-propelled preloading device moves from the head end to the end of the running track 7, the part of the head of the running track that does not support the self-propelled preloading device is removed from the template 9 and fixed on the hook 13, and is transferred along the guide rail 11 to the next walking interval on the template 9 and laid, thereby realizing the rapid transfer of the running track 7.

[0063] A preloading method of a self-propelled preloading device suitable for a cast-in-place beam support, specifically comprising the following steps:

[0064] (1) First, set up the cast-in-place beam support 8 and install the bottom form of the cast-in-place beam formwork 9, and lay the running track 7;

[0065] (2) Lift the components of the load distribution system 4 onto the bottom formwork, place the load distribution beam 41 on the bottom plate pressure beam 42 and the web plate pressure beam 43 according to the dimensions in the drawing, and hinge the three accordingly;

[0066] (3) Install the traveling system 2 on the reaction beam support 1 on the ground;

[0067] (4) Hoist the reaction beam support 1 onto the bottom mold of the template 9 so that the running wheel set 22 of the running system 2 is supported on the upper surface of the running track 7;

[0068] (5) Install the connecting pin of the reaction beam bracket 1 to connect the multiple sections of the reaction beam bracket 1 into a whole;

[0069] (6) Install the control system 6 and turn on the power supply so that the reaction beam support can move along the running track 7;

[0070] (7) Fine-tune the position of the reaction beam support 1 so that the pressure system 3 on the bottom end of the reaction beam support 1 is aligned with the connection position of the load distribution beam 41, and install the hydraulic cylinder of the pressure system 3 until all the hydraulic cylinders are installed;

[0071] (8) Install the guide rail 11 and the counter roller 12 with the hook 13 on the reaction beam bracket 1;

[0072] (9) Install the hydraulic pipeline and other control parts, start the hydraulic control, and retract the hydraulic cylinder;

[0073] (10) Start the travel control to make the preloading device travel to the preloading position;

[0074] (11) Anchor the preloading device with the anchor rod of the locking system 5;

[0075] (12) Start the control system for preloading. Workers can set the ratio of the preloading load according to the standard until the maximum preloading load is reached, and unload after the preloading time is up; (while executing steps 1 to 12, the second and third segment cast-in-place beam supports 8 can be set up)

[0076] (13) After the preloading is completed, the anchor rod of the locking system 5 is removed, and the running system 2 is started, so that the preloading device moves along the running track 7 to the preloading position of the second segment cast-in-place beam support 8;

[0077] (14) Remove the running track 7 on the template of the previous section, transfer it to the third section through the guide rail 11 and lay it;

[0078] (15) Repeat steps 10 to 15 until all cast-in-place beam supports 8 are pre-stressed.

[0079] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-propelled preloading device suitable for cast-in-place beam supports, characterized in that: It includes a reaction beam support with a rectangular frame structure, a running system and a pressure system fixedly connected to the bottom end of the reaction beam support, a load distribution system connected to the pressure system, a locking system for positioning the reaction beam support, and a control system; the running system includes a drive motor, a plurality of running wheel groups fixed to both sides of the bottom end of the reaction beam support and driven by the drive motor, and the plurality of running wheel groups are symmetrically arranged along the central axis of the reaction beam support; the pressure system includes a plurality of hydraulic cylinders fixed to the bottom end of the reaction beam support, the plurality of hydraulic cylinders are divided into two rows, the two rows of hydraulic cylinders are symmetrical along the central axis of the reaction beam support, and each row of hydraulic cylinders is evenly distributed along the running direction of the reaction beam support; the load distribution system includes The invention comprises two rows of load distribution beams, a plurality of bottom plate pressure beams connected between the two rows of load distribution beams, and a web plate pressure beam connected to the outer end of each load distribution beam. The two rows of load distribution beams, the plurality of bottom plate pressure beams and the plurality of web plate pressure beams are all arranged horizontally. The two rows of load distribution beams are symmetrical along the running direction of the reaction beam bracket. The plurality of load distribution beams in each row of load distribution beams are parallel to each other. The two rows of hydraulic cylinders are located directly above the corresponding two rows of load distribution beams. The vertically downward piston rod of each hydraulic cylinder is hinged to a corresponding load distribution beam. In the two rows of load distribution beams, the inner end of one row of load distribution beams is arranged opposite to the inner end of the other row of load distribution beams, and the inner end portions of the two load distribution beams opposite to each other are respectively It is supported on the two end parts of the corresponding bottom plate pressure beam, and the two end parts of the bottom plate pressure beam are hinged to the inner end parts of the corresponding two load distribution beams, and the top end of each web pressure beam is hinged to the outer end part of a corresponding load distribution beam; the locking system includes a shoulder beam fixed to the top end of the reaction beam bracket and an anchor rod with the top end fixed on the shoulder beam, and the bottom end of the anchor rod is pre-buried in the pier; the control system includes a speed sensor fixed on the running wheel group, a running control module, a pressure sensor fixed on the hydraulic cylinder, a pre-pressure control module, and a main control module; the running control module and the pre-pressure control module are connected to the main control module, and the speed sensor, the driving motor of the running system They are all connected to the travel control module, the pressure sensor and the hydraulic cylinder of the pressure system are all connected to the pre-pressing control module, the travel control module collects the travel speed through the speed sensor, and controls the travel speed of the entire self-propelled pre-pressing device by controlling the driving motor of the travel system, the pre-pressing control module collects the pressure signal of the hydraulic cylinder through the pressure sensor, and achieves the purpose of graded control of the pre-pressing load by controlling the pressure of the hydraulic cylinder, the main control module centrally sends control commands to the travel control module and the pre-pressing control module, so that the hydraulic cylinder of the entire self-propelled pre-pressing device cannot work when it is traveling, and the driving motor of the travel system cannot work when the hydraulic cylinder is pre-pressing; The reaction beam support is provided with guide rails extending in the direction of travel of the reaction beam support on both sides symmetrically along its axis, each guide rail is slidably connected with a counter roller, each counter roller is provided with a hook for hanging and fixing the travel rail, the travel rail support is positioned on the template above the cast-in-place beam support, the length of the travel rail is greater than the length of the self-propelled preloading device, and the travel wheel group of the self-propelled preloading device travels and transfers along the travel rail; The length between the hinge point between the hydraulic cylinder and the load distribution beam and the hinge point between the load distribution beam and the web pressure beam is L1, and the length between the hinge point between the hydraulic cylinder and the load distribution beam and the hinge point between the load distribution beam and the bottom plate pressure beam is L2. The ratio of L1 to L2 is equal to the ratio of the weight of 1 / 2 bottom plate and web of the cast-in-place beam.

2. A self-propelled preloading device suitable for cast-in-place beam support according to claim 1, characterized in that: The top end of each web compression beam is hinged to the corresponding load distribution beam, the two rows of web compression beams connected to the outer ends of the two rows of load distribution beams are parallel to each other, and the ends of multiple web compression beams in each row are butt-jointed in sequence.

3. The self-propelled preloading device suitable for cast-in-place beam support according to claim 1, characterized in that: The bottom plate pressure beam is a horizontally arranged rectangular frame structure, and two relatively parallel sides of the bottom plate pressure beam are respectively hinged to two corresponding load distribution beams.

4. The self-propelled preloading device suitable for cast-in-place beam support according to claim 1, characterized in that: The locking system comprises a plurality of vertically arranged anchor rods, the top ends of the plurality of anchor rods are fixed on the shoulder beam, and the bottom ends of the plurality of anchor rods are pre-buried in the bridge pier.

5. The self-propelled preloading device suitable for cast-in-place beam support according to claim 1, characterized in that: The difference between the bottom end height of the web plate pressure beam and the bottom end height of the bottom plate pressure beam is equal to the thickness of the template above the cast-in-place beam support.

6. The self-propelled preloading device suitable for cast-in-place beam support according to claim 1, characterized in that: The main control module comprises a single chip microcomputer, a hydraulic pump station switch, a travel start and stop button and a display screen which are respectively connected to the single chip microcomputer.

7. The preloading method of the self-propelled preloading device suitable for cast-in-place beam support according to claim 1, characterized in that: Specifically, the following steps are included: (1) first set up the cast-in-place beam support and install the bottom form of the cast-in-place beam formwork, and lay the running track; (2) hoist the components of the load distribution system onto the bottom formwork, place the load distribution beam on the bottom plate pressure beam and the web pressure beam according to the dimensions in the drawing, and hinge the three accordingly; (3) install the running system on the reaction beam support on the ground; (4) hoist the reaction beam support to the bottom formwork of the formwork so that the running wheel group of the running system is supported on the upper surface of the running track; (5) install the connecting pin of the reaction beam support so that the multi-section reaction beam support is connected as a whole; (6) install the control system and turn on the power so that the reaction beam support can move along the running track. ; (7) Fine-tune the position of the reaction beam bracket so that the pressure system on the bottom end of the reaction beam bracket is aligned with the connection position of the load distribution beam, and install the hydraulic cylinder of the pressure system until all the hydraulic cylinders are installed; (8) Install the guide rails and the anti-roller with hooks on the reaction beam bracket; (9) Install the hydraulic pipeline and the remaining control parts, start the hydraulic control, and retract the hydraulic cylinder; (10) Start the travel control to make the pre-stressing device move to the pre-stressing position; (11) Anchor the pre-stressing device with the anchor rod of the locking system; (12) Start the control system for pre-stressing. The workers can set the proportion of the pre-stressing load according to the standard until the maximum pre-stressing load, and unload after the pre-stressing time is up; (13) After preloading is completed, remove the anchor rods of the locking system, start the running system, and allow the preloading device to run along the running track to the preloading position of the second-segment cast-in-place beam support; (14) Remove the running track on the previous segment template, transfer it to the third segment via the guide rail and lay it; (15) Repeat steps 10 to 15 until all cast-in-place beam supports are preloaded.

8. The preloading method of the self-propelled preloading device suitable for cast-in-place beam support according to claim 7, characterized in that: While executing steps 1 to 12, the cast-in-place beam supports of the second and third sections are set up.

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