CN109944167B - Temporary sliding support structure for jacking large-span lower frame and construction method thereof - Google Patents
Temporary sliding support structure for jacking large-span lower frame and construction method thereof Download PDFInfo
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- CN109944167B CN109944167B CN201910209932.XA CN201910209932A CN109944167B CN 109944167 B CN109944167 B CN 109944167B CN 201910209932 A CN201910209932 A CN 201910209932A CN 109944167 B CN109944167 B CN 109944167B
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- 238000010276 construction Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 50
- 239000010959 steel Substances 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model provides a temporary sliding support structure that large-span underframe was jacked and construction method thereof, temporary sliding support structure includes prefabricated frame of lower part, upper portion overhead beam and sliding support device, the top of prefabricated frame of lower part is pre-buried to have along the track that the direction straight line set up of jacking, sliding support device includes the slip block, highly adjustable double-deck post, connect steel sheet and spherical ball group, highly adjustable double-deck post's bottom fixed connection is in the top centre of slip block, highly adjustable double-deck post's top fixed connection is in the bottom centre of connect steel sheet, spherical ball group embeds between the slip block of below track and top, upper portion overhead beam falls to be put at the upside surface of connect steel sheet and with connect steel sheet fixed connection. The invention combines the advantages of the sliding trolley and the short support, can reduce the jacking friction in the jacking process, and can also be used as the short support to share the vertical load transmitted to the frame. The device has the advantages of simple modeling, convenient construction, cost saving and construction period saving, and has obvious advantages.
Description
Technical Field
The invention relates to a sliding support structure, in particular to a sliding support structure for jacking a large-span lower frame and a construction method thereof.
Background
Along with the rapid development of urban construction and the continuous optimization of a traffic system, the frequency of intersection between a newly built or renovated road and a railway or between a road and a road in the city is increased, the newly built or renovated road and the railway or the road and the road are gradually changed into an interchange from the previous flat interchange adopted, namely, the manually-excavated piles are firstly constructed at the two sides of the threaded road to serve as buttresses, the threaded road is reinforced by adopting a commonly-used D-shaped convenient beam or a vertically and horizontally lifted beam, then a foundation pit and a prefabricated frame are excavated at one side of the threaded road, a frame bridge is jacked along the axis of the constructed road, the manually-excavated piles on the jacking line are required to be timely broken in the jacking process, and finally, the reinforced beam and the top backfilled at the frame top are removed to recover the railway line.
In the frame jacking process, a slideway or a sliding trolley is generally arranged between the top of the frame and the overhead beam so as to reduce jacking friction; meanwhile, the short support is also arranged to share the downward transmission load when the external vehicle passes, so that the problem that the whole stress system is too large in vertical stress deformation of the reinforcing beam due to the reduction of vertical supporting points when the manual hole digging pile is broken is avoided, and the influence on a threaded path is caused. However, the slide way or the sliding trolley which is usually adopted is easy to be blocked due to untimely deviation correction in the jacking process, so that the threaded path is deformed to a certain extent, the operation of the vehicle on the upper part of the line is greatly influenced, and meanwhile, the construction workload is increased due to the fact that too many short supports are arranged.
Disclosure of Invention
The invention aims to provide a temporary sliding support structure for jacking a large-span lower frame and a construction method thereof, which aim to solve the technical problem that a sliding trolley between the top of the frame and an overhead beam on the upper part is blocked due to untimely deviation correction in the jacking process, so that a threaded path is deformed; and solves the technical problem of workload increase caused by additionally arranging a short support between the top of the frame and the overhead beam.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a temporary sliding support structure for jacking a large-span lower frame comprises a lower prefabricated frame, an upper overhead beam and a sliding support device arranged between the lower prefabricated frame and the upper overhead beam,
The lower part of the upper overhead beam and the top part of the lower prefabricated frame are pre-embedded with rails which are arranged in a straight line along the jacking direction, the rails are groove-shaped rails which are concave relative to the upper surface of the lower prefabricated frame,
The sliding support device comprises a height-adjustable double-layer column arranged horizontally in the middle of a solid stainless steel sliding block, a connecting steel plate and a spherical ball group, wherein the top of the connecting steel plate is horizontally arranged, the bottom end of the height-adjustable double-layer column is fixedly connected with the center of the top of the sliding block, the top end of the height-adjustable double-layer column is fixedly connected with the center of the bottom of the connecting steel plate,
The sliding block body is arranged right above the track in the middle, the sliding block body is a solid rectangular block body, the width of the sliding block body is larger than that of the track, a group of arc-shaped grooves which are in one-to-one correspondence with the spherical ball groups are arranged on the bottom surface of the sliding block body, the arc-shaped grooves are spherical crown surfaces, the diameter of the spherical surface where the spherical crown surfaces are positioned is the same as that of a single spherical ball,
The lower half part of the spherical ball group is arranged in the lower track, the upper half part is fixed by a cambered surface full-contact buckle cover of an arc-shaped groove of the sliding block, a reserved gap is arranged between the lower side surface of the sliding block and the upper side surface of the lower prefabricated frame, the diameter of the spherical balls in the spherical ball group is smaller than the sum of the height of the sliding block and the depth of the track,
The upper overhead beam is arranged on the upper side surface of the connecting steel plate and fixedly connected with the connecting steel plate.
The track is made of steel, and the track is spatially parallel or spatially intersected with the overhead beam.
The height-adjustable double-layer column is a nested double-layer steel sleeve, and comprises an inner-layer circular tube and an outer-layer circular tube, wherein the bottom of the outer-layer circular tube is fixedly connected to the center of the top of a sliding block body, an outer-tube bolt hole is horizontally formed in the top of the outer-layer circular tube and uniformly distributed along the radial direction of the tube wall, an inner-tube bolt hole is horizontally formed in the inner-layer circular tube and uniformly distributed along the radial direction of the tube wall, at least two inner-tube bolt holes are formed in the inner-tube bolt hole at intervals along the height direction of the inner-layer circular tube, the number of each inner-tube bolt hole is equal to the number of the outer-tube bolt holes, and the outer-tube bolt holes are aligned with one inner-tube bolt holes and penetrate and are anchored through sleeve bolts with the same number of the outer-tube bolt holes.
The width of the connecting steel plate is the same as that of the upper overhead beam, connecting steel plate bolt holes are formed in four corners of the connecting steel plate, overhead beam bolt holes are formed in the bottom of the upper overhead beam, and the connecting steel plate and the upper overhead beam are anchored through connecting bolts penetrating through the steel plate bolt holes and the overhead beam bolt holes.
The spherical ball group comprises six solid stainless steel spherical balls, two rows are arranged along the jacking direction, three rows are arranged in the vertical jacking direction, and the width of the track is 2.5 times the center-to-center distance between two adjacent spherical balls.
Lubricating oil is smeared on the upper side surface of the rail and the lower side surface of the arc-shaped groove.
Two backing plates are arranged in the reserved gap in a cushioning mode, the backing plates are perpendicular to the jacking direction and are arranged on two sides of the spherical ball group respectively, and two ends of each backing plate transversely span the two sides of the track.
The backing plate is a steel plate or a wood plate, is not connected with the spherical ball group, and has a thickness not smaller than the height of the reserved gap
A construction method of a temporary sliding support structure for jacking a large-span lower frame comprises the following construction steps:
step one, analyzing the stability of a lower prefabricated frame and an upper overhead beam structure system in the jacking process of the lower prefabricated frame according to numerical simulation and structural stress analysis, and determining a position needing to be arranged with temporary support on a jacking route;
step two, reserving overhead beam bolt holes at the bottoms of the upper overhead beams corresponding to the determined temporary supporting positions;
Step three, determining the positions and the number of the pre-buried tracks on the lower prefabricated frame according to the temporary supporting parts, wherein the track direction is consistent with the jacking direction;
Step four, when the lower prefabricated frame is jacked to the temporary supporting position, assembling the sliding supporting device:
Welding the bottom of the height-adjustable double-layer column with a sliding block, welding the top of the height-adjustable double-layer column with a connecting steel plate, putting a spherical ball group into a track, aligning and buckling an arc-shaped groove of the sliding block on the spherical ball group, adjusting the height of the height-adjustable double-layer column to adapt to the distance between an upper overhead beam and a lower prefabricated frame, and fixedly connecting the connecting steel plate with the upper overhead beam through a connecting bolt;
continuously jacking the lower prefabricated frame, and monitoring the deviation between the sliding block and the track in real time and correcting the deviation through the rolling of the spherical ball group in the track;
and step six, when the lower prefabricated frame is jacked in place, the upper overhead beam and the sliding supporting device can be sequentially dismantled, concrete is backfilled to the track, then railway ballasts or earthwork is backfilled to the upper side of the lower prefabricated frame, and the threaded path is restored.
When the external load changes on the upper part of the overhead beam: the vehicle passes through, the emergency stops the construction or the frame is jacked in place, a pad which increases the contact area and reduces the stress concentration is inserted into a reserved gap between the lower prefabricated frame and the sliding block, and the jacking of the lower prefabricated frame is suspended.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
The invention provides a temporary sliding support structure for jacking a long-span lower frame, which can simultaneously reduce jacking friction and share external loads such as external vehicle traffic. The structure sets up between upper portion overhead beam and lower part frame, has a sliding support device, and the device has combined the advantage of slip dolly and short support, and the spout is preset at lower part frame top, and the slip block cooperation spherical ball of sliding support device bottom is walked on spout upper portion, in the frame jacking in-process, can show to reduce the jacking friction. The sliding block is fixed with the double columns with adjustable height, the double columns are made of round tubes and are connected with the overhead beams on the upper portion, the sliding block can be pulled to adjust the height at any time to adapt to the conditions of the intervals between different frames and the overhead beams, meanwhile, when the sliding block is passed through by a threading path, a base plate is padded between the sliding block and the frames, the sliding block can also serve as a short support for use, and external vertical loads transmitted to the frames are shared. The device has the advantages of simple modeling, convenient construction, construction cost saving and construction period saving, and has obvious advantages.
The invention can also be applied to other similar underpass jacking projects.
Drawings
The invention is described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic perspective view of the temporary sliding support structure of the present invention during traveling.
Fig. 2 is a longitudinal sectional view of fig. 1 in the frame jacking direction.
Fig. 3 is a cross-sectional view of the vertical frame of fig. 1 in the jacking direction.
Fig. 4 is a block diagram of the sliding block of section A-A of fig. 2 and 8.
Fig. 5 is a block diagram of the height-adjustable double-layered column of section B-B of fig. 3 and 9.
Fig. 6 is a side elevational view of the inner tubular.
Fig. 7 is a schematic view showing a three-dimensional structure of the temporary sliding support structure of the present invention for suspending travel.
Fig. 8 is a longitudinal sectional view of fig. 7 in the frame jacking direction.
Fig. 9 is a cross-sectional view of the vertical frame of fig. 7 in the jacking direction.
Reference numerals: 1-inner round pipe, 11-inner pipe bolt hole 2-outer round pipe, 21-outer pipe bolt hole, 3-connecting steel plate, 31-connecting steel plate hole, 4-sliding block, 41-arc groove, 5-spherical ball group, 6-sleeve bolt, 7-connecting bolt, 8-upper overhead beam, 81-overhead beam bolt hole, 9-lower prefabricated frame, 10-track, 12-backing plate and 13-reserved gap.
Detailed Description
1-6, A temporary sliding support structure for jacking a large-span lower frame comprises a lower prefabricated frame 9 and an upper overhead beam 8, and further comprises a sliding support device arranged between the lower prefabricated frame and the upper overhead beam.
The rail 10 linearly arranged along the jacking direction is embedded at the top of the lower prefabricated frame 9 and below the upper overhead beam 8, and the rail 10 is a groove type rail which is concave relative to the upper surface of the lower prefabricated frame 9.
The sliding support device comprises a sliding block body 4 of solid stainless steel, a height-adjustable double-layer column at the middle part, a connecting steel plate 3 and a spherical ball group 5, wherein the sliding block body is horizontally arranged at the bottom, the connecting steel plate 3 and the spherical ball group 5 are horizontally arranged at the top, the bottom end of the height-adjustable double-layer column is fixedly connected to the center of the top of the sliding block body 4, and the top end of the height-adjustable double-layer column is fixedly connected to the center of the bottom of the connecting steel plate 3.
The sliding block body is arranged right above the track 10 in the middle, the sliding block body 4 is a solid rectangular block body, the width of the sliding block body is larger than that of the track 10, a group of arc grooves corresponding to the spherical ball groups 5 one by one are formed in the bottom surface of the sliding block body, the arc grooves are spherical crown surfaces, and the diameter of the spherical surface where the spherical crown surfaces are located is identical to that of a single spherical ball.
The lower half part of the spherical ball group 5 is internally arranged in the lower track 10, the upper half part is fixed by a cambered surface full-contact buckle cover with the cambered groove 41 of the sliding block, a reserved gap is arranged between the lower side surface of the sliding block 4 and the upper side surface of the lower prefabricated frame 9, and the diameter of the spherical balls in the spherical ball group is smaller than the sum of the height of the sliding block 4 and the depth of the track 10.
The upper overhead beam 8 is placed on the upper side surface of the connection steel plate 3 and fixedly connected with the connection steel plate 3.
The rail 10 is made of steel, and the rail 10 is spatially parallel to or spatially intersected with the upper overhead beam 8.
The height-adjustable double-layer column is a nested double-layer steel sleeve, and comprises an inner-layer circular tube 1 and an outer-layer circular tube 2, wherein the bottom of the outer-layer circular tube 2 is fixedly connected to the center of the top of a sliding block 4, an outer-tube bolt hole 21 is horizontally formed in the top of the outer-layer circular tube 2 and uniformly distributed along the radial direction of the tube wall, an inner-tube bolt hole 11 is horizontally formed in the inner-layer circular tube 1 and uniformly distributed along the radial direction of the tube wall, at least two inner-tube bolt holes 11 are arranged at intervals along the height direction of the inner-layer circular tube, the number of each inner-tube bolt hole 11 is equal to the number of the outer-tube bolt holes 21, and the outer-tube bolt holes 21 are aligned with one inner-tube bolt holes 11 and penetrate and are anchored through sleeve bolts 6 with the same number of the outer-tube bolt holes.
In this embodiment, four outer tube bolt holes 21 are provided, five inner tube bolt holes 11 are provided, and four inner tube bolt holes are provided.
The width of the connecting steel plate 3 is the same as the width of the upper overhead beam 8, connecting steel plate bolt holes 31 are formed in four corners of the connecting steel plate 3, overhead beam bolt holes 81 are formed in the bottom of the upper overhead beam 8, and the connecting steel plate 3 and the upper overhead beam 8 are anchored through connecting bolts 7 penetrating through the steel plate bolt holes 31 and the overhead beam bolt holes 81.
The spherical ball group 5 comprises six solid stainless steel spherical balls, two rows are arranged along the jacking direction, three rows are arranged perpendicular to the jacking direction, and the width of the track is 2.5 times the center-to-center distance between two adjacent spherical balls. The sliding direction of the spherical ball is universal, so that the blocking probability of the sliding device during rolling due to deviation in the frame jacking process can be obviously reduced, and correction is facilitated.
The upper surface of the rail 10 and the lower surface of the arc-shaped groove 41 are coated with lubricating oil, so that friction with the sliding device is reduced.
The construction method of the temporary sliding support structure for jacking the large-span lower frame comprises the following construction steps:
According to numerical simulation and structural stress analysis, the stability of the structural system of the lower prefabricated frame 9 and the upper overhead beam 8 in the jacking process of the lower prefabricated frame 9 is analyzed, and the position where temporary support needs to be arranged on a jacking route is determined.
And step two, reserving overhead beam bolt holes 81 at the bottom of the upper overhead beam 8 corresponding to the determined temporary supporting position.
And thirdly, determining the positions and the number of the pre-buried tracks 10 on the lower prefabricated frame 9 according to the temporary supporting parts, wherein the track direction is consistent with the jacking direction.
And step four, assembling the sliding support device when the lower prefabricated frame 9 is jacked up to the temporary support position.
The bottom of the height-adjustable double-layer column is welded with the sliding block 4, the top of the height-adjustable double-layer column is welded with the connecting steel plate 3, the spherical ball group 5 is placed in the track 10, the arc-shaped groove of the sliding block 4 is aligned and buckled on the spherical ball group 5, the height of the height-adjustable double-layer column is adjusted to adapt to the distance between the upper overhead beam 8 and the lower prefabricated frame 9, and then the connecting steel plate 3 and the upper overhead beam 8 are fixedly connected through the connecting bolt 7.
And fifthly, continuously jacking the lower prefabricated frame, and monitoring the deviation between the sliding block and the track in real time and correcting the deviation through the rolling of the spherical ball group in the track.
And step six, when the lower prefabricated frame is jacked in place, the upper overhead beam 8 and the sliding supporting device can be sequentially dismantled, concrete is backfilled to the track, then the railway ballast or earthwork is backfilled to the upper side of the lower prefabricated frame, and the threaded path is restored.
Referring to fig. 7-9, when the load change occurs on the upper part of the overhead beam, such as the traffic of vehicles or other emergency stop construction, or when the frame is pushed in place, the pushing of the lower prefabricated frame is stopped, a pad 12 for increasing the contact area and reducing the stress concentration is inserted into a reserved gap between the lower prefabricated frame 9 and the sliding block 4, two pads 12 are padded in the reserved gap, the pads 12 are vertically pushed in the direction and are respectively arranged on two sides of the spherical ball group 5, and two ends of each pad 12 transversely span two sides of the rail 10. The backing plate 12 is a steel plate or a wood plate, is not connected with the spherical ball group 5, and has a thickness not smaller than the height of the reserved gap.
Claims (3)
1. A construction method of a temporary sliding support structure for jacking a large-span lower frame is characterized by comprising the following steps:
the temporary sliding support structure for jacking the large-span lower frame comprises a lower prefabricated frame (9) and an upper overhead beam (8), and also comprises a sliding support device arranged between the lower prefabricated frame and the upper overhead beam,
A track (10) which is arranged along the jacking direction in a straight line is embedded at the top of the lower prefabricated frame (9) and below the upper overhead beam (8), the track (10) is a groove-shaped track which is concave relative to the upper surface of the lower prefabricated frame (9),
The sliding support device comprises a solid stainless steel sliding block body (4) with the bottom horizontally arranged, a height-adjustable double-layer column in the middle, a connecting steel plate (3) with the top horizontally arranged and a spherical ball group (5), wherein the bottom end of the height-adjustable double-layer column is fixedly connected with the top center of the sliding block body (4), the top end of the height-adjustable double-layer column is fixedly connected with the bottom center of the connecting steel plate (3),
The sliding block body is arranged right above the track (10) in the middle, the sliding block body (4) is a solid rectangular block body, the width of the sliding block body is larger than that of the track (10), a group of arc-shaped grooves which are in one-to-one correspondence with the spherical ball groups (5) are arranged on the bottom surface of the sliding block body, the arc-shaped grooves are spherical crown surfaces, the diameter of the spherical surface where the spherical crown surfaces are positioned is the same as that of a single spherical ball,
The lower half part of the spherical ball group (5) is arranged in the lower track (10), the upper half part is fixed by a cambered surface full-contact buckle cover with a cambered groove (41) of the sliding block, a reserved gap is arranged between the lower side surface of the sliding block (4) and the upper side surface of the lower prefabricated frame (9), the diameter of the spherical balls in the spherical ball group is smaller than the sum of the height of the sliding block (4) and the depth of the track (10),
The upper overhead beam (8) is arranged on the upper side surface of the connecting steel plate (3) in a falling manner and is fixedly connected with the connecting steel plate (3);
the height-adjustable double-layer column is a nested double-layer steel sleeve and comprises an inner-layer circular tube (1) and an outer-layer circular tube (2), the bottom of the outer-layer circular tube (2) is fixedly connected to the center of the top of a sliding block (4), an outer-tube bolt hole (21) which is uniformly distributed along the radial direction of the tube wall is horizontally formed in the top of the outer-layer circular tube (2), inner-tube bolt holes (11) which are uniformly distributed along the radial direction of the tube wall are horizontally formed in the inner-layer circular tube (1), at least two inner-tube bolt holes (11) are arranged at intervals along the height direction of the inner-layer circular tube, the number of each inner-tube bolt hole (11) is the same as the number of outer-tube bolt holes (21), and the outer-tube bolt holes (21) are aligned with one inner-tube bolt hole (11) and are fixedly penetrated through sleeve bolts (6) which are the same as the number of the outer-tube bolt holes;
the spherical ball group (5) comprises six solid stainless steel spherical balls, two rows are arranged along the jacking direction, three rows are arranged in the vertical jacking direction, and the width of the track is 2.5 times the center-to-center distance between two adjacent spherical balls;
lubricating oil is smeared on the upper side surface of the track (10) and the lower side surface of the arc-shaped groove (41);
two backing plates (12) are arranged in the reserved gap in a cushioning manner, the backing plates (12) are perpendicular to the jacking direction and are respectively arranged at two sides of the spherical ball group (5), and two ends of each backing plate (12) transversely span two sides of the track (10);
The backing plate (12) is a steel plate or a wood plate, is not connected with the spherical ball group (5), and has a thickness not smaller than the height of the reserved gap;
The construction steps of the temporary sliding support structure for jacking the large-span lower frame are as follows:
Step one, analyzing the stability of a lower prefabricated frame (9) and an upper overhead beam (8) structural system in the jacking process of the lower prefabricated frame (9) according to numerical simulation and structural stress analysis, and determining a position needing to be arranged with temporary support on a jacking route;
step two, reserving overhead beam bolt holes (81) at the bottoms of the upper overhead beams (8) corresponding to the determined temporary supporting parts;
determining the positions and the number of the pre-buried tracks (10) on the lower prefabricated frame (9) according to the temporary supporting parts, wherein the track direction is consistent with the jacking direction;
step four, when the lower prefabricated frame (9) is jacked to the temporary supporting position, assembling the sliding supporting device:
Welding the bottom of the height-adjustable double-layer column with a sliding block (4), welding the top of the height-adjustable double-layer column with a connecting steel plate (3), putting a spherical ball group (5) into a track (10), aligning and buckling an arc-shaped groove of the sliding block (4) on the spherical ball group (5), adjusting the height of the height-adjustable double-layer column to adapt to the distance between an upper overhead beam (8) and a lower prefabricated frame (9), and fixedly connecting the connecting steel plate (3) with the upper overhead beam (8) through a connecting bolt (7);
continuously jacking the lower prefabricated frame, and monitoring the deviation between the sliding block and the track in real time and correcting the deviation through the rolling of the spherical ball group in the track;
step six, when the lower prefabricated frame is jacked in place, the upper overhead beam (8) and the sliding supporting device can be sequentially dismantled, concrete is backfilled to the track, then railway ballasts or earthwork is backfilled on the upper side of the lower prefabricated frame, and a threaded path is restored;
When the external load changes on the upper part of the overhead beam: the vehicle passes through, the emergency stops construction or the frame is jacked in place, a pad (12) which increases the contact area and reduces the stress concentration is inserted into a reserved gap between the lower prefabricated frame (9) and the sliding block (4), and the jacking of the lower prefabricated frame is stopped.
2. The construction method of the temporary sliding support structure for jacking the large-span lower frame according to claim 1, wherein the construction method comprises the following steps: the rail (10) is made of steel, and the rail (10) is spatially parallel or spatially intersected with the upper overhead beam (8).
3. The construction method of the temporary sliding support structure for jacking the large-span lower frame according to claim 1, wherein the construction method comprises the following steps: the width of connecting steel sheet (3) is the same with the width of upper portion overhead beam (8), connecting steel sheet bolt hole (31) are opened in the four corners department of connecting steel sheet (3), overhead beam bolt hole (81) are opened to the bottom of upper portion overhead beam (8), connecting steel sheet (3) and upper portion overhead beam (8) are through connecting bolt (7) anchor that runs through steel sheet bolt hole (31) and overhead beam bolt hole (81).
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| CN201910209932.XA CN109944167B (en) | 2019-03-19 | 2019-03-19 | Temporary sliding support structure for jacking large-span lower frame and construction method thereof |
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| CN110439569B (en) * | 2019-08-06 | 2024-06-14 | 中建一局集团建设发展有限公司 | Slideway system for jacking frame and construction method thereof |
| CN114839357B (en) * | 2022-03-25 | 2023-05-16 | 河海大学 | Device and method for testing frost heaving stress and frost heaving strain of porous asphalt mixture |
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