A system and construction method for multi-point girder lowering of box girders

Abstract

The present invention relates to a system and a construction method for multi-point beam dropping of a box girder, which comprises: a pier body, and a beam body located at the top of the pier body; a permanent support for supporting the beam body, which is supported on the top of the pier body through a steel pipe; a push-up anti-skid assembly for pushing the beam body, one end of which is anchored to the side of the pier body and the other end is anchored to the beam body; a vertical jack, which is arranged at the top of the pier body and located between the beam body and the pier body, and the beam body is dropped to a preset height above the permanent support by the vertical jack. The present invention relates to a system and a construction method for multi-point beam dropping of a box girder, which has a short installation time of permanent supports, and the beam body is not easy to slide down during beam dropping construction on a large longitudinal slope, so the safety risk is relatively small and the cost is relatively low.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a system suitable for multi-point beam dropping of a box beam and a construction method thereof. Background Art

[0002] With the vigorous development of infrastructure construction in my country, there are more and more continuous box girder bridges across highways, rivers and existing bridges. In order to ensure the normal operation of traffic under the bridge and the safety of construction, the box girder is generally constructed by pushing it to the preset position first and then dropping the beam.

[0003] In the related technology, the traditional beam-dropping construction with a walking jack uses a walking machine to drop to a low position, and then replaces the jack for subsequent beam-dropping. However, this method is difficult to install and remove in the narrow space between the pier body and the beam body due to the large size of the walking machine. The replacement of the permanent support takes a long time, the entire beam-dropping process is slow, and there is a risk of slipping during the construction of beam-dropping on a large longitudinal slope.

[0004] Therefore, it is necessary to design a new system and construction method suitable for multi-point box girder dropping to overcome the above problems. Summary of the invention

[0005] The embodiment of the present invention provides a system and a construction method suitable for multi-point box girder dropping, so as to solve the problems of the walking jack pushing method in the related art, such as the difficulty in installation and removal in a small space, the long time required to replace the permanent support, and the risk of sliding during the beam dropping construction on a large longitudinal slope.

[0006] In a first aspect, a system suitable for multi-point beam dropping of a box girder is provided, which comprises: a pier body, and a beam body located at the top of the pier body; a permanent support for supporting the beam body, which is supported on the top of the pier body through a steel pipe; a push-up anti-skid assembly for pushing the beam body, one end of which is anchored to the side of the pier body, and the other end is anchored to the beam body; a vertical jack, which is arranged on the top of the pier body and located between the beam body and the pier body, and the beam body is dropped to a preset height above the permanent support by the vertical jack.

[0007] In some embodiments, the jacking anti-skid assembly includes: a through-hole jack fixed to the side of the pier body; an anchor column passing through the beam body; an anchor cable, one end of which passes through the through-hole jack and is anchored to the through-hole jack, and the other end is anchored to the anchor column.

[0008] In some embodiments, the jacking anti-skid assembly also includes a reaction frame, which is vertically anchored to the side of the pier body; the through-hole jack is fixed to the side of the reaction frame away from the pier body, so that the anchor cable extends from the side of the pier body where the through-hole jack is provided to the other side.

[0009] In some embodiments, there are multiple vertical jacks, which are symmetrically arranged on the top of the pier body; the system also includes a hydraulic pump station arranged on the top of the pier body, and the hydraulic pump station has a hydraulic valve, and the rise and fall of the vertical jacks are controlled by the hydraulic valve.

[0010] In some embodiments, a steel plate is placed between the vertical jack and the beam body, and an asbestos mesh is placed between the steel plate and the beam body.

[0011] In some embodiments, a pad stone is provided on the top of the pier body, the permanent support is moved onto the pad stone through the steel pipe, and a high-strength mortar pad is provided between the permanent support and the pad stone.

[0012] In the second aspect, a construction method of the above-mentioned system suitable for multi-point beam dropping of box girders is provided, comprising the following steps: supporting the permanent support on the top of the pier body through a steel pipe; hoisting the beam body above the pier body; anchoring one end of the jacking anti-skid assembly to the side of the pier body and the other end to the beam body; dragging the permanent support to a preset position through the steel pipe; and dropping the beam body to a preset height above the permanent support through the vertical jack.

[0013] In some embodiments, the system also includes a temporary support arranged on the top of the pier body for supporting the beam body, and supporting the permanent support on the top of the pier body through a steel pipe includes: removing the support anchor legs of the permanent support and setting a pre-bias value of the permanent support, placing the permanent support on one side of the temporary support, supporting its bottom with the steel pipe, and temporarily fixing the permanent support.

[0014] In some embodiments, the system also includes a temporary support disposed on the top of the pier body for supporting the beam body. Before the permanent support is dragged to a preset position through the steel pipe, it also includes: lifting the beam body through the vertical jack and physically locking the vertical jack; and removing the temporary support from between the beam body and the pier body.

[0015] In some embodiments, the permanent bearing has a bearing anchor leg, a pad stone is fixedly provided on the top of the pier body, the pad stone is provided with a reserved hole, and an anchor sleeve is provided in the reserved hole. After the permanent bearing is dragged to a preset position through the steel pipe, it also includes: passing the bearing anchor leg through the permanent bearing and connecting it with the anchor sleeve in the reserved hole, and after tightening the anchor sleeve, grouting is poured into the reserved hole to fix the permanent bearing to the pad stone.

[0016] The beneficial effects brought about by the technical solution provided by the present invention include:

[0017] The embodiment of the present invention provides a system and a construction method suitable for multi-point beam dropping of a box girder. Since the permanent support is supported on the top of the pier body by a steel pipe, the permanent support can be placed on the pier body before the beam body is hoisted to the pier body. After the beam body is hoisted to the pier body, the permanent support can be moved to a preset position by dragging the steel pipe, and the installation of the permanent support is convenient. The pushing anti-skid component can play a role in pushing the beam body before the beam body is dropped, and move the beam body to a preset position. During the beam dropping process, the beam body can be pulled to prevent the beam body from sliding down, and one end of the anti-skid component is anchored to the side of the pier body instead of between the pier body and the beam body. It is convenient to install and remove, and there is no need to use a walking jack. Therefore, the installation time of the permanent support is short, and in the beam dropping construction on a large longitudinal slope, the beam body is not easy to slide down, the safety risk is relatively small, and the cost is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A side view schematic diagram of a system suitable for multi-point beam dropping of a box beam provided in an embodiment of the present invention;

[0020] Figure 2 A schematic top view of a system for multi-point drop of a box girder provided by an embodiment of the present invention without vertical jacks;

[0021] Figure 3 for Figure 2 Schematic cross-sectional view of AA in the figure;

[0022] Figure 4 A partial top view schematic diagram of a system for multi-point beam dropping of a box beam provided by an embodiment of the present invention after vertical jacks are placed;

[0023] Figure 5 for Figure 4 A schematic cross-sectional view of the middle BB;

[0024] Figure 6 A schematic side view of a system for multi-point drop of a box girder provided in an embodiment of the present invention after vertical jacks are placed;

[0025] Figure 7 A side view schematic diagram of a system suitable for multi-point beam dropping of a box beam provided in an embodiment of the present invention;

[0026] Figure 8An overall top view schematic diagram of a system suitable for multi-point box girder dropping provided in an embodiment of the present invention after vertical jacks are placed.

[0027] In the figure:

[0028] 1. Pier body; 11. Pad stone;

[0029] 2. Beam body;

[0030] 3. Permanent support; 31. Steel pipe;

[0031] 4. Pushing anti-skid assembly; 41. Through-hole jack; 42. Anchor column; 43. Anchor cable; 44. Anchor; 45. Reaction frame;

[0032] 5. Vertical jack; 51. Steel plate; 52. Asbestos mesh;

[0033] 6. Hydraulic pump station;

[0034] 7. Temporary support;

[0035] 8. Lateral limit device. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0037] The embodiment of the present invention provides a system and a construction method suitable for multi-point box girder dropping, which can solve the problems of the walking jack pushing method in the related technology, the difficulty of installation and dismantling in a small space, the long time required to replace the permanent support, and the risk of sliding during the beam dropping construction on a large longitudinal slope.

[0038] See also Figure 1 , Figure 4 and Figure 5As shown, a system suitable for multi-point beam dropping of a box girder provided by an embodiment of the present invention may include: a pier body 1, and a beam body 2 located at the top of the pier body 1, wherein in this embodiment, there may be multiple pier bodies 1, and they are arranged below the beam body 2 at intervals along the longitudinal direction of the beam body 2, and the beam body 2 may be a concrete continuous box girder; a permanent support 3 for supporting the beam body 2, which may be supported on the top of the pier body 1 by a steel pipe 31, wherein the permanent support 3 is permanently supported between the pier body 1 and the beam body 2 after the beam dropping is completed; a push-up anti-skid component 4 for pushing the beam body 2, one end of which is anchored to the pier The jacking anti-skid component 4 is provided on the side of the pier body 1, and the other end is anchored to the beam body 2, wherein the jacking anti-skid component 4 can push the beam body 2 to the designed position before the beam body 2 is dropped, and the jacking anti-skid component 4 does not need to be removed during the process of the beam body 2 dropping, and the jacking anti-skid component 4 can hold the beam body 2 to reduce the risk of the beam body 2 sliding down; and the vertical jack 5, which can be arranged on the top of the pier body 1 and is located between the beam body 2 and the pier body 1, can lift the beam body 2 and drop it to a preset height above the permanent support 3 through the vertical jack 5; in the specific implementation, the operation is simple, which can effectively reduce the difficulty of installation and improve work efficiency.

[0039] See also Figure 1 As shown, in some embodiments, the jacking anti-skid assembly 4 may include: a through-hole jack 41, which can be fixed to the side of the pier body 1. In this embodiment, the beam body 2 is a large-slope concrete continuous box beam, so that the beam body 2 is tilted as a whole on the pier body 1, and the through-hole jack 41 is arranged on the side of the beam body 2 with a relatively high elevation, so that the installation and disassembly space is relatively large; an anchor column 42, which is penetrated by the beam body 2. In this embodiment, the beam body 2 can be pre-reserved with a hole, and the anchor column 42 is penetrated by the hole reserved in the beam body 2 to achieve a stable connection with the beam body 2; and an anchor cable 43, one end of which passes through the through-hole jack 41 and is anchored to the through-hole jack 41, and the other end can be anchored to the anchor column 42 by an anchor 44. By setting the through-hole jack 41, the anchor cable 43 can cross the center of the through-hole jack 41, and the through-hole jack 41 can be installed at a relatively low height, so that the falling height of the beam body 2 is smaller than that of the walking jack, and the safety risk is relatively small.

[0040] See also Figure 1As shown, in some optional embodiments, the jacking anti-skid assembly 4 may also include a reaction frame 45, which may be vertically anchored on the side of the pier body 1, that is, the reaction frame 45 and the pier body 1 are both arranged vertically in parallel, and the reaction frame 45 may be anchored on the pier body 1 by steel bars; the through-hole jack 41 may be fixed to the side of the reaction frame 45 away from the pier body 1, so that the anchor cable 43 extends from the side of the pier body 1 where the through-hole jack 41 is provided to the other side opposite to the anchor column 42 and is fixed thereto, and the pier body 1 may transmit force to the beam body 2 through the reaction frame 45 and the anchor cable 43 to ensure that the beam body 2 slides down and separates in a balanced manner, thereby achieving a square reverse sliding effect; and because the reaction frame 45 is sandwiched between the pier body 1 and the through-hole jack 41, when the through-hole jack 41 is subjected to the pulling force of the anchor cable 43, the pulling force is transmitted to the reaction frame 45, so that the reaction frame 45 is in closer contact with the pier body 1, thereby preventing the reaction frame 45 from separating from the pier body 1.

[0041] See also Figure 4 , Figure 5 and Figure 8 As shown, in some embodiments, there may be multiple vertical jacks 5, and they are symmetrically arranged on the top of the pier body 1. In this embodiment, two pad stones 11 are fixed on the top of the pier body 1 at intervals along the transverse bridge direction, wherein each pad stone 11 is provided with two vertical jacks 5 on opposite sides along the longitudinal bridge direction; the system may also include a hydraulic pump station 6 arranged on the top of the pier body 1. In this embodiment, two hydraulic pump stations 6 are symmetrically arranged on the top of the pier body 1, each hydraulic pump station 6 has two hydraulic valves, each hydraulic valve is connected to two vertical jacks 5 at the same position, and the rise and fall of the vertical jacks 5 can be controlled by the hydraulic valve.

[0042] See also Figure 6 and Figure 7 As shown, further, the vertical jack 5 can have a physical locking device, which can lock the vertical jack 5 at any time to support the beam 2 at a fixed height, and can also avoid the risk of hydraulic locking failure; and the upper part of the vertical jack 5 can be a spherical connecting disc, and the vertical jack 5 can adapt to the longitudinal slope.

[0043] See also Figures 5 to 7 As shown, further, steel plates 51 can be placed between the vertical jack 5 and the beam body 2, and between the vertical jack 5 and the pier body 1 to increase the force-bearing area, and asbestos nets 52 can be placed between the steel plate 51 at the top of the vertical jack 5 and the beam body 2 to increase the friction between the steel plate 51 and the beam body 2.

[0044] See also Figure 2 and Figure 3As shown, in some embodiments, a pad stone 11 may be provided on the top of the pier body 1, and the permanent support 3 may be moved to the designed position on the pad stone 11 through a steel pipe 31, and a high-strength mortar pad may be provided between the permanent support 3 and the pad stone 11, and the elevation of the permanent support 3 may be controlled by the high-strength mortar pad.

[0045] See also Figure 2 and Figure 3 As shown, further, a temporary support 7 can be provided on the cushion stone 11. The temporary support 7 is used to temporarily support the beam body 2 when the beam body 2 has not yet fallen. After the vertical jack 5 is installed, the beam body 2 can be lifted up by the vertical jack 5, and then the temporary support 7 can be removed, and the permanent support 3 can be adjusted to the designed position, and then the beam body 2 can be dropped to the designed position by the vertical jack 5.

[0046] See also Figures 2 to 5 As shown, further, a reserved hole can be provided on the cushion stone 11, and an anchor sleeve can be provided in the reserved hole. The permanent support 3 can have a support anchor leg. By passing the support anchor leg through the permanent support 3 and connecting it with the anchor sleeve in the reserved hole, and grouting in the reserved hole, the permanent support 3 and the cushion stone 11 can be permanently fixed together.

[0047] See also Figure 1 , Figure 6 and Figure 8 As shown, the embodiment of the present invention also provides a construction method of the above-mentioned system applicable to multi-point beam dropping of box beams, which comprises the following steps:

[0048] Step 1: Support the permanent support 3 on the top of the pier body 1 through the steel pipe 31.

[0049] In some embodiments, before step 1, two pad stones 11 may be fixed on the top of the pier body 1 along the transverse direction, and a temporary support 7 may be fixed on each pad stone 11, and the temporary support 7 is used for the subsequent temporary support of the beam body 2.

[0050] Furthermore, before step 1, a transverse limiting device 8 may be fixed on the outer side of each cushion stone 11 to limit the transverse direction of the beam body 2.

[0051] Further, in step 1, the permanent support 3 is supported on the top of the pier body 1 by the steel pipe 31, including: before the beam body 2 reaches the pier body 1, the support anchor legs of the permanent support 3 are removed, and the pre-bias value of the permanent support 3 is set, the permanent support 3 is placed on one side of the temporary support 7, the bottom of which is supported by the steel pipe 31, and the permanent support 3 is temporarily fixed. Specifically, the permanent support 3 is partially supported on the cushion stone 11 and partially supported on the top surface of the pier body 1, and the permanent support 3 and the cushion stone 11, as well as the permanent support 3 and the pier body 1 can be supported by the steel pipe 31, so as to facilitate the movement of the position of the permanent support 3.

[0052] Step 2: Lift the beam 2 above the pier 1.

[0053] Furthermore, in step 2 , the beam body 2 is hoisted above the pier body 1 , so that the beam body 2 is supported on the temporary support 7 .

[0054] Step 3: Anchor one end of the jacking anti-skid assembly 4 to the side of the pier body 1 and the other end to the beam body 2.

[0055] Furthermore, the jacking anti-skid assembly 4 may include: a through-hole jack 41, an anchor column 42, an anchor cable 43, and a reaction frame 45; in step 3, one end of the jacking anti-skid assembly 4 is anchored to the side of the pier body 1, and the other end is anchored to the beam body 2, including: fixing the reaction frame 45 to the side of the pier body 1 through steel bars, fixing the through-hole jack 41 to the side of the reaction frame 45 away from the pier body 1, passing the anchor column 42 through the reserved hole of the beam body 2 and fixing it to the beam body 2, and passing one end of the anchor cable 43 through the through-hole jack 41, and fixing the other end to the anchor column 42, thereby realizing the connection between the pier body 1 and the beam body 2 through the jacking anti-skid assembly 4, thereby achieving the effect of preventing the beam body 2 from sliding down during the process of lowering the beam.

[0056] Step 4: Drag the permanent support 3 to a preset position via the steel pipe 31 .

[0057] In some embodiments, before step 4, it also includes: symmetrically arranging vertical jacks 5 on opposite sides of each cushion stone 11, and at the same time, padding steel plates 51 on the top and bottom of the vertical jacks 5, so that a steel plate 51 is provided between the vertical jacks 5 and the pier body 1, and a steel plate 51 is also provided between the vertical jacks 5 and the beam body 2, and an asbestos net 52 can be provided above the steel plate 51 at the top of the vertical jacks 5, and at the same time, hydraulic pump stations 6 can be respectively arranged on opposite sides of the top of the pier body 1 along the longitudinal bridge direction, and the hydraulic pump stations 6 are connected to the vertical jacks 5, and the hydraulic pump stations 6 have the function of controlling the vertical jacks. The hydraulic valve of the top 5; the vertical jack 5 can be controlled by the hydraulic valve to lift the beam body 2 at the same time, so that the bottom surface of the beam body 2 is about 75mm away from the temporary support, and the force difference of each hydraulic valve shall not exceed 5Mpa. After the beam body 2 is lifted, the vertical jack 5 needs to be physically locked immediately through the physical locking device; then the temporary support 7 can be immediately removed from between the beam body 2 and the pier body 1; among them, the vertical jack 5 adopts a hydraulic jack with a smaller profile, which is convenient for installation in a small space. The number of vertical jacks is determined according to the span number of the beams that need to be dropped, and the adjacent pier bodies 1 can be operated alternately, saving a lot of time.

[0058] In some embodiments, in step 4, the permanent support 3 can be dragged to a preset position on the surface of the pad stone 11 by rolling the steel pipe 31, and a high-strength mortar pad can be set between the permanent support 3 and the pad stone 11 to control the elevation of the permanent support 3 by the high-strength mortar pad.

[0059] Step 5: Use the vertical jack 5 to lower the beam 2 to a preset height above the permanent support 3 .

[0060] Further, in step 5, the beam body 2 is dropped to a preset height above the permanent support 3 by the vertical jack 5, including: after the permanent support 3 is installed, the physical lock of the vertical jack 5 is released, and the vertical jack 5 is controlled to descend by the hydraulic valve to drop the beam body 2 to the designed position above the permanent support 3 (at this time, there is a gap between the beam body 2 and the permanent support 3) and lock the vertical jack 5 again.

[0061] Furthermore, the pad stone 11 on the top of the pier body 1 can be provided with a reserved hole, and an anchor sleeve can be provided in the reserved hole. After step 5, it also includes: passing the support anchor leg through the permanent support 3 to connect with the anchor sleeve in the reserved hole, and tightening the anchor sleeve. At the same time, a template is installed on the bottom surface of the beam body 2, and then the reserved hole of the pad stone 11, the gap between the permanent support 3 and the beam body 2, and the gap between the permanent support 3 and the pad stone 11 are grouted, so that the permanent support 3 is permanently fixed between the beam body 2 and the pier body 1. After the strength reaches the design strength, the template and the vertical jack 5 and the hydraulic pump station 6 are removed, and the single-point beam drop (that is, the beam body 2 on one of the pier bodies 1 is dropped) is completed.

[0062] In the embodiment of the present invention, the beam is dropped by a single point, that is, only the beam body 2 above a single pier body 1 is allowed to rise or fall each time, and it is dropped from the downhill side to the other side in sequence. The drop height each time shall not exceed the design allowable value, and the drop height difference of the beam body 2 between two adjacent pier bodies 1 shall not exceed the design allowable value. This construction method adopts the low-position beam drop method, and the prefabricated top push and beam drop construction are comprehensively considered to control the height difference between the temporary support 7 and the permanent support 3 as much as possible. In this way, the beam drop amplitude is small, the construction is fast, and the beam drop difference between adjacent piers does not exceed the design value, which can achieve the effect of continuous beam drop.

[0063] The principles of a system and a construction method for multi-point beam dropping of a box beam provided by an embodiment of the present invention are as follows:

[0064] Since the permanent support 3 is supported on the top of the pier body 1 by the steel pipe 31, the permanent support 3 can be placed on the pier body 1 in advance before the beam body 2 is hoisted to the pier body 1. After the beam body 2 is hoisted to the pier body 1, the permanent support 3 can be moved to the preset position by dragging the steel pipe 31, and the installation of the permanent support 3 is convenient. The push-up anti-skid component 4 can play the role of pushing the beam body 2 before the beam body 2 is dropped, and move the beam body 2 to the preset position. During the process of dropping the beam, the beam body 2 can be pulled to prevent the beam body 2 from sliding down. One end of the anti-skid component 4 is anchored to the side of the pier body 1 instead of between the pier body 1 and the beam body 2. It is easy to install and remove, and there is no need to use a walking jack. The falling height of the beam body 2 is smaller than that of the walking jack. Therefore, the installation of the permanent support 3 takes a short time, which improves work efficiency. In the construction of dropping the beam on a large longitudinal slope, the beam body 2 is not easy to slide down, the safety risk is relatively small, the cost is relatively low, and there is no need to set up temporary piers, which saves costs.

[0065] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0066] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0067] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A system suitable for multi-point beam dropping of box beams, characterized in that: It includes: A pier body (1), and a beam body (2) located on top of the pier body (1); A permanent support (3) for supporting the beam body (2), which is supported on the top of the pier body (1) through a steel pipe (31); A pushing anti-skid assembly (4) for pushing the beam body (2), one end of which is anchored to the side of the pier body (1) and the other end of which is anchored to the beam body (2); A vertical jack (5) is arranged on the top of the pier body (1) and is located between the beam body (2) and the pier body (1), and the beam body (2) is lowered to a preset height above the permanent support (3) by the vertical jack (5); The push-up anti-skid assembly (4) comprises: A through-hole jack (41) fixed to the side of the pier body (1); An anchor column (42) passing through the beam body (2); An anchor cable (43), one end of which passes through the through-hole jack (41) and is anchored to the through-hole jack (41), and the other end of which is anchored to the anchor column (42); The jacking anti-skid assembly (4) further comprises a reaction frame (45), wherein the reaction frame (45) is vertically anchored to the side surface of the pier body (1); The through-hole jack (41) is fixed to a side of the reaction frame (45) away from the pier body (1), so that the anchor cable (43) extends from the side of the pier body (1) where the through-hole jack (41) is provided to the other side opposite thereto; A cushion stone (11) is provided on the top of the pier body (1), the permanent support (3) is moved onto the cushion stone (11) via the steel pipe (31), and a high-strength mortar cushion block is provided between the permanent support (3) and the cushion stone (11).

2. The system for multi-point drop of box beams as claimed in claim 1, characterized in that: There are multiple vertical jacks (5), which are symmetrically arranged on the top of the pier body (1); The system further comprises a hydraulic pump station (6) arranged on the top of the pier body (1), wherein the hydraulic pump station (6) has a hydraulic valve, and the rise and fall of the vertical jack (5) are controlled by the hydraulic valve.

3. The system for multi-point drop of box beams as claimed in claim 1, characterized in that: A steel plate (51) is placed between the vertical jack (5) and the beam body (2), and an asbestos net (52) is placed between the steel plate (51) and the beam body (2).

4. A construction method for a system for multi-point beam drop of a box beam as claimed in claim 1, characterized in that: The following steps are involved: The permanent support (3) is supported on the top of the pier body (1) via a steel pipe (31); Hoisting the beam body (2) above the pier body (1); Anchoring one end of the jacking anti-skid assembly (4) to the side of the pier body (1) and the other end to the beam body (2); Dragging the permanent support (3) to a preset position via the steel pipe (31); Lowering the beam body (2) to a preset height above the permanent support (3) by means of the vertical jack (5); The permanent support (3) has a support anchor leg, a cushion stone (11) is fixedly provided on the top of the pier body (1), the cushion stone (11) is provided with a reserved hole, and an anchor sleeve is provided in the reserved hole. After the permanent support (3) is dragged to a preset position through the steel pipe (31), the method further comprises: The support anchor leg is passed through the permanent support (3) and connected to the anchor sleeve in the reserved hole. After the anchor sleeve is tightened, grout is poured into the reserved hole to fix the permanent support (3) and the cushion stone (11).

5. The construction method according to claim 4, characterized in that: The system further comprises a temporary support (7) arranged on the top of the pier body (1) for supporting the beam body (2), and the permanent support (3) is supported on the top of the pier body (1) via a steel pipe (31), comprising: The support anchor legs of the permanent support (3) are removed, and a pre-bias value of the permanent support (3) is set. The permanent support (3) is placed on one side of the temporary support (7), and its bottom is supported by the steel pipe (31), and the permanent support (3) is temporarily fixed.

6. The construction method according to claim 4, characterized in that: The system further comprises a temporary support (7) arranged on the top of the pier body (1) for supporting the beam body (2), and before the permanent support (3) is dragged to a preset position through the steel pipe (31), the system further comprises: Lifting the beam body (2) by means of the vertical jack (5), and physically locking the vertical jack (5); The temporary support (7) is removed from between the beam body (2) and the pier body (1).

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