A method and device for lifting construction of a box bridge with excessive headstock

Abstract

The present invention discloses a method and device for lifting a box bridge with an over-standard jacking head, and relates to the technical field of jacking box bridge construction on existing railways, including the following steps: a train passes slowly through a hard overhead section of railway, and protection of the train and construction personnel is done well; the elevation of the control points of the four top corners of the box bridge before lifting is measured; two jacking pick back reaction force foundation pits are excavated on both sides of the bottom plate of the jacking end or the lifting end of the box bridge; a steel mesh is tied in the jacking pick back reaction force foundation pit, and then high-grade C60 quick-drying concrete is poured; four jacking picks are evenly installed on the back reaction force foundations of the two jacking picks; using the gap of the existing railway where the train has not passed the hard overhead section, eight jacking picks are synchronously lifted to lift the jacking head end of the box bridge; two sand blowing machines are used to send sand grains to fill the gap raised by the jacking head end of the box bridge; after the railway equipment unit passes the acceptance, the train is restored to normal speed and the slow speed limit condition is lifted. The present invention solves the problem that the existing construction method cannot meet the clear height limit value required by the specification for cars to pass through the box bridge.

Description

Technical Field

[0001] The invention relates to the technical field of construction of existing railway jacking box bridges, and in particular to a jacking construction method and device for a jacking box bridge with an over-standard head. Background Art

[0002] After the box bridge is jacked into place, if the net height of the road surface inside the box bridge is lower than the road surface height limit required by the specification, it is necessary to lift the front or rear end of the jacked box bridge as a whole to meet the above requirements. Generally, the elevations of the four corners of the top surface of the box bridge are observed during the jacking process. If the actual measured elevation of the top surface of the box bridge is lower than the design elevation of the top surface of the box bridge before jacking and there is a head-down phenomenon, appropriate under-digging of the earthwork at the front end of the jacking box bridge or extension of the slide plate of the jacking box bridge bottom plate foundation or pre-embedded rising rail slides are adopted to prevent the jacking box bridge from head-down. In other words, the measure to prevent the box bridge from head-down is to gradually raise or control the actual measured elevation of the top surface of the box bridge to the design value or reduce it by taking appropriate under-digging of the earthwork at the front end of the box bridge bottom plate foundation or extension of the slide plate of the jacking box bridge bottom plate foundation or pre-embedded rising rail slides as the box bridge is jacked forward.

[0003] Sometimes, due to the weak soil under the bottom plate of the box bridge, even if the above measures are taken at every jacking distance during the jacking process, the box bridge not only does not rise but drops more seriously, until the actual elevation of the top surface of the box bridge after the box bridge is jacked into place and the difference between the designed elevation far exceeds the allowable value of the specification. In this case, the box bridge must be lifted to meet the above requirements, and the box bridge lifting construction method is not common.

[0004] Therefore, there is an urgent need to provide a method and device for lifting a box bridge with excessive head displacement to solve the above-mentioned problems existing in the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a method and device for jacking up a box bridge with an over-standard jacking head, so as to solve the problem that the existing construction method cannot meet the standard requirements for the clear height limit value of the car passing through the box bridge.

[0006] To achieve the above object, the present invention provides the following solution: The present invention provides a method for lifting a box bridge with an over-standard jacking head, comprising the following steps:

[0007] Step 1: The train should slowly pass through the railway of the hard overhead section of the box bridge after the jacking is in place. According to the existing railway line construction regulations, the driving and construction personnel should be well protected to ensure driving, personal and construction safety;

[0008] Step 2: Measure the elevation of the control points at the four top corners of the box bridge before the box bridge is lifted, as a basis for judging the lifting effect of the box bridge, so as to obtain the actual size of the net height of the road surface inside the box bridge;

[0009] Step 3: dig two back reaction force foundation pits of top picks on both sides of the bottom plate of the head end or the lifting end of the box bridge;

[0010] Step 4: After the two top pick back reaction force foundation pits are excavated and formed, a steel mesh is tied in the top pick back reaction force foundation pit, and then quick-drying concrete is poured;

[0011] Step 5: After the quick-drying concrete reaches the designed strength, four top picks are evenly installed on the two top pick back reaction force foundations. A steel plate with the same area as the top pick back reaction force foundation is laid between the top pick bottom and the top pick back reaction force foundation. Hard miscellaneous wood is padded between the top pick top and the bottom plate of the box bridge. After the installation is completed and the pressure test is qualified, the work is completed;

[0012] Step 6: After the box bridge is blocked and jacked into place, the existing railway in the hard overhead section is used. Using the gap in the existing railway where the train has not passed, 8 jacking picks are used to simultaneously jack up the head end of the box bridge. At the same time, the surveying personnel record the changes in the elevation of the four top corners of the box bridge at any time and report the lifting amount of the box bridge in real time. At the same time, the existing railway professionals in the hard overhead section observe the line level and center line and make adjustments in real time to ensure the safety of railway transportation.

[0013] Step 7: When the top end of the box bridge is lifted into place and the net height limit value of the car passing through the box bridge is adjusted to meet the requirements and have a predetermined surplus, two sand blowers are used to send sand to fill the gap of the top end of the box bridge until the pressure of the sand blower reaches the predetermined pressure to prevent the box bridge from sinking too much;

[0014] Step 8: After the blockade is lifted, let the train slowly pass through the existing railway in the hard overhead section; if the box bridge is too heavy, lift it up appropriately and fill it with sand; if the box bridge does not sink anymore, remove the top pick, manually backfill the soil at the two lifting positions in layers and compact it;

[0015] Step 9: At the slow-moving point, the reinforcement equipment of the existing railway in the hard overhead section is removed between trains, and railway professionals restore the line. After the railway equipment unit has passed the acceptance inspection, the train is restored to normal speed and the slow-moving speed limit conditions are lifted.

[0016] The present invention also discloses a jacking construction device for a jacking box bridge with an over-standard jacking head, comprising two back reaction foundations of jacking picks, the two back reaction foundations of the jacking picks are respectively arranged on both sides of the bottom plate of the jacking head end or the jacking end of the box bridge, and four jacking picks are evenly installed on each back reaction foundation of the jacking pick; a steel plate with the same area as the back reaction foundation of the jacking pick is laid between the bottom of the jacking pick and the back reaction foundation of the jacking pick, and hard miscellaneous wood is padded between the top of the jacking pick and the bottom plate of the box bridge.

[0017] Preferably, the top pick back reaction force foundation includes a top pick back reaction force foundation pit, in which a steel mesh is tied and quick-drying concrete is poured.

[0018] Preferably, the steel mesh includes a plurality of main bars, and the plurality of main bars are fixed by stirrups; the thread diameter of the main bars is Ф12-16 mm, and the round steel diameter of the stirrups is Ф8-12 mm.

[0019] Preferably, the quick-drying concrete is high-grade C60 quick-drying concrete.

[0020] Preferably, the back reaction foundation pit of the top pick is 2m long along the line direction, 1.5m wide in the vertical line direction, and the manual excavation depth does not exceed 2.5m.

[0021] Preferably, the top pick is a 320t top pick and the steel plate thickness is 2cm.

[0022] Compared with the prior art, the present invention has achieved the following technical effects:

[0023] The jacking construction method for a box bridge with an over-standard jacking head of the present invention can effectively solve the problem that the existing construction method cannot meet the standard requirements for the clear height limit value of the car passing through the box bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 paying creative work.

[0025] Figure 1 It is a plan view of a jacking construction device for a jacking box bridge with an over-standard jacking head according to the present invention;

[0026] Figure 2 It is a schematic elevation view of a jacking construction device for a jacking box bridge with an over-standard plunge head according to the present invention;

[0027] Figure 3 It is a side schematic diagram of a jacking construction device for a jacking box bridge with an over-standard head of the present invention;

[0028] Among them, 1-box bridge, 2-railway, 3-top angle, 4-top pick back reaction foundation, 5-top pick, 6-steel plate, 7-hard miscellaneous wood, 8-top excavation baseline of top pick back reaction foundation. DETAILED DESCRIPTION

[0029] 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.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Embodiment 1

[0032] like Figure 1-3 As shown, this embodiment provides a method for lifting a box bridge with an over-standard jacking head, comprising the following steps:

[0033] In the first step, the train must move slowly through the hard overhead section of railway 2 where the box bridge 1 is jacked into place. In accordance with the regulations for existing railway line construction, the protection of drivers and construction personnel must be done to ensure driving, personal and construction safety.

[0034] The second step is to measure the elevations of 3 control points at the four top corners of the box bridge before the box bridge 1 is lifted, which serves as a basis for judging the lifting effect of the box bridge, thereby obtaining the actual size of the clear height of the road surface inside the box bridge.

[0035] The third step is to dig two top pick back reaction force foundation 4 pits on both sides of the bottom plate of the head end or the jacking end of the box bridge 1. The top pick back reaction force foundation 4 pits are about 2m long along the line direction and about 1.5m wide in the vertical line direction. The manual excavation depth to the position with harder soil shall not exceed 2.5m.

[0036] The fourth step, after the two jacking pick back reaction foundation 4 pits are excavated and formed, the steel mesh is tied in the pit of the jacking pick back reaction foundation 4. The main reinforcement is a threaded diameter of Ф12-16mm, and the stirrups are round steel with a diameter of Ф8-12mm. After completion, high-grade C60 quick-drying concrete is poured to ensure that the jacking pick back reaction foundation 4 has sufficient jacking strength.

[0037] The fifth step, after the C60 quick-drying concrete of the top pick back reaction foundation 4 reaches the design strength in a very short and limited time, four 320t top picks 5 are evenly installed on the two top pick back reaction foundations 4, and a 2cm thick steel plate 6 with the same area as the top pick back reaction foundation 4 is laid between the bottom of the top pick 5 and the top pick back reaction foundation 4, and a hard miscellaneous wood 7 is padded between the top of the top pick 5 and the bottom plate of the box bridge 1. After the installation is completed and the pressure test is passed, it is ready for installation.

[0038] Step 6: After the box bridge 1 is put into place, the existing railway 2 in the hard overhead section is blocked. Using the gap where the train has not passed through the existing railway 2 in the hard overhead section, 8 320t jacking picks 5 synchronously lift the head end of the box bridge 1. At the same time, the surveying personnel record the change in the elevation of the four top corners 3 of the box bridge at any time and report the lifting amount of the box bridge 1 in real time; at the same time, the professionals of the existing railway 2 in the hard overhead section observe the line level and center line, and make adjustments in real time to ensure the safety of railway transportation.

[0039] The seventh step is to lift the top end of the box bridge 1 into place and adjust it to the clear height limit value for the car to pass through the box bridge and have enough surplus. Use two sand blowers to quickly send sand to fill the gap in the raised top end of the box bridge 1 until the pressure gauge of the sand blower reaches a certain pressure. Do not let the box bridge 1 sink too much.

[0040] Step 8: After the blockade is lifted, the train is allowed to slowly pass through the existing railway 2 in the hard overhead section. If the box bridge 1 is too depressed, it can be slightly lifted and filled with sand; if the box bridge 1 does not sink any more, the top pick 5 device is removed, and the soil at the two lifted positions is manually backfilled in layers until it is compacted.

[0041] The ninth step is to dismantle the reinforcement equipment of the existing railway 2 in the hard overhead section between trains at the slow-moving point, and restore the line by railway professionals. After the railway equipment unit has passed the acceptance inspection, the train will resume normal speed and lift the slow-moving speed limit conditions.

[0042] Also disclosed in this embodiment is a jacking construction device for a jacking box bridge with an over-standard head, comprising two back reaction foundations of jacking picks, the two back reaction foundations of the jacking picks being respectively arranged on both sides of the bottom plate of the head end or the jacking end of the box bridge, and four jacking picks being evenly installed on each back reaction foundation of the jacking pick; a steel plate with the same area as the back reaction foundation of the jacking pick is laid between the bottom of the jacking pick and the back reaction foundation of the jacking pick, and hard miscellaneous wood is padded between the top of the jacking pick and the bottom plate of the box bridge.

[0043] Preferably, the top pick back reaction force foundation includes a top pick back reaction force foundation pit, in which a steel mesh is tied and quick-drying concrete is poured.

[0044] Preferably, the steel mesh includes a plurality of main bars, and the plurality of main bars are fixed by stirrups.

[0045] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for lifting a box bridge with excessive head loading, characterized in that: The following steps are involved: Step 1: The train should slowly pass through the railway of the hard overhead section of the box bridge after the jacking is in place. According to the existing railway line construction regulations, the driving and construction personnel should be well protected to ensure driving, personal and construction safety; Step 2: Measure the elevation of the control points at the four top corners of the box bridge before the box bridge is lifted, as a basis for judging the lifting effect of the box bridge, so as to obtain the actual size of the net height of the road surface inside the box bridge; Step 3: dig two back reaction force foundation pits of top picks on both sides of the bottom plate of the head end or the lifting end of the box bridge; Step 4: After the two top pick back reaction force foundation pits are excavated and formed, a steel mesh is tied in the top pick back reaction force foundation pit, and then quick-drying concrete is poured; Step 5: After the quick-drying concrete reaches the designed strength, four top picks are evenly installed on the two top pick back reaction force foundations. A steel plate with the same area as the top pick back reaction force foundation is laid between the top pick bottom and the top pick back reaction force foundation. Hard miscellaneous wood is padded between the top pick top and the bottom plate of the box bridge. After the installation is completed and the pressure test is qualified, the work is completed; Step 6: After the box bridge is blocked and jacked into place, the existing railway in the hard overhead section is used. Using the gap in the existing railway where the train has not passed, 8 jacking picks are used to simultaneously jack up the head end of the box bridge. At the same time, the surveying personnel record the changes in the elevation of the four top corners of the box bridge at any time and report the lifting amount of the box bridge in real time. At the same time, the existing railway professionals in the hard overhead section observe the line level and center line and make adjustments in real time to ensure the safety of railway transportation. Step 7: When the top end of the box bridge is lifted into place and the net height limit value of the car passing through the box bridge meets the requirements and has a predetermined surplus, two sand blowers are used to send sand to fill the gap of the top end of the box bridge until the pressure of the sand blower reaches the predetermined pressure to prevent the box bridge from sinking too much; Step 8: After the blockade is lifted, let the train slowly pass through the existing railway in the hard overhead section; if the box bridge is too heavy, lift it up appropriately and fill it with sand; if the box bridge does not sink anymore, remove the top pick, manually backfill the soil at the two lifting positions in layers and compact it; Step 9: At the slow-moving point, the reinforcement equipment of the existing railway in the hard overhead section is removed between trains, and railway professionals restore the line. After the railway equipment unit has passed the acceptance inspection, the train is restored to normal speed and the slow-moving speed limit conditions are lifted.

2. The method for lifting a box bridge with excessive headstock according to claim 1 is characterized in that: The method is implemented by adopting a jacking construction device for a box bridge with an oversized head, which comprises two back reaction foundations of jacking picks, and the two back reaction foundations of jacking picks are respectively arranged on both sides of the bottom plate of the jacking end or the lifting end of the box bridge, and four jacking picks are evenly installed on each back reaction foundation of the jacking pick; a steel plate with the same area as the back reaction foundation of the jacking pick is laid between the bottom of the jacking pick and the back reaction foundation of the jacking pick, and hard miscellaneous wood is padded between the top of the jacking pick and the bottom plate of the box bridge.

3. The method for lifting a box bridge with excessive headstock according to claim 2 is characterized in that: The top pick back reaction force foundation comprises a top pick back reaction force foundation pit, in which a steel mesh is tied and quick-drying concrete is poured.

4. The method for lifting a box bridge with excessive headstock according to claim 3 is characterized in that: The steel mesh includes a plurality of main bars, and the plurality of main bars are fixed by stirrups; the thread diameter of the main bars is Ф12-16mm, and the round steel diameter of the stirrups is Ф8-12mm.

5. The method for lifting a box bridge with excessive headstock according to claim 3 is characterized in that: The quick-drying concrete is high-grade C60 quick-drying concrete.

6. The method for lifting a box bridge with excessive headstock according to claim 3 is characterized in that: The back reaction foundation pit of the top pick is 2m long along the line direction, 1.5m wide in the vertical line direction, and the manual excavation depth does not exceed 2.5m.

7. The method for lifting a box bridge with excessive headstock according to claim 2 is characterized in that: The top pick is a 320t top pick and the steel plate is 2cm thick.

Images