CN210368589U - Suspended combined bridge for in-situ protection of cable set above foundation pit - Google Patents
Suspended combined bridge for in-situ protection of cable set above foundation pit Download PDFInfo
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- CN210368589U CN210368589U CN201921046871.1U CN201921046871U CN210368589U CN 210368589 U CN210368589 U CN 210368589U CN 201921046871 U CN201921046871 U CN 201921046871U CN 210368589 U CN210368589 U CN 210368589U
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Abstract
The utility model relates to an in-situ protection technology based on urban pipelines in municipal construction, in particular to a suspended combined bridge for in-situ protection of a cable group above a foundation pit, which has the structural key points that the bridge comprises main beams at two sides, an I-shaped beam, a U-shaped suspension frame, a connecting long rod and a suspension joist; the main beam of the bridge is fixed on bearing platforms at two sides of the foundation pit in a suspension erecting mode, and the I-shaped cross beam is connected with a suspension joist below the I-shaped cross beam for supporting the cable group through a U-shaped suspension frame and a long connecting rod. The utility model has the advantages that the preparation workload is reduced, the construction difficulty is greatly reduced, the construction interference to the main body at the lower part of the foundation pit is small, the construction is convenient and fast, and the efficiency is high; the device can be flexibly adapted to the position change of the arc-shaped laid pipeline without occupying too much land, and has simple and light structure.
Description
Technical Field
The utility model relates to a based on city pipeline's normal position protection technique during municipal construction, especially a unsettled combination bridge that is used for foundation ditch top cable assembly normal position to protect.
Background
With the development of our economic society in China, the transformation of old cities becomes an important part of the construction of modern cities, and shallow municipal pipelines, especially pipe culverts containing cable sets, are often encountered in the excavation construction process of deep foundation pits in basements, subway stations, urban water conservancy facilities and the like of house buildings. Although the pipe culverts are generally buried to a small depth, the construction of foundation pit guard piles, earth excavation and main structures can be affected. The method is characterized in that a pipeline moving and modifying mode is adopted for processing common municipal pipelines at present, and in-situ protection measures are adopted for important urban power pipelines with complex moving and modifying procedures and large social influences, so that the safe operation of the urban power pipelines in the foundation pit construction process is ensured.
According to different protection objects, in-situ protection can be divided into pipe culvert in-situ protection and cable in-situ protection, wherein the pipe culvert in-situ protection is that the pipe culvert is regarded as a whole, a protection structure is adopted to make the pipe culvert overhead, after a main body structure at the lower part of a foundation pit is finished, and a soil body below the pipe culvert is backfilled and recovered, the protection structure is removed, so that zero influence on a power pipeline is realized, and the in-situ protection is in the true sense; the cable in-situ protection is to regard a cable group in a pipe culvert as a protection object, remove an original pipe culvert after the cable group is erected by adopting a protection structure, rebuild the pipe culvert by combining a main structure after a main structure at the lower part of a foundation pit is finished, and fix the cable group again.
In the prior art, the cable in-situ protection construction is complex, the process is complicated, the protection structure is generally manufactured on site, the construction period is long, and the pipe culvert in-situ protection is convenient to operate and has zero influence on pipelines, so that the protection structure becomes the first choice in the field. However, the pipe culvert is mostly concrete, the suspension weight is heavy, the requirement on deformation is high, and a cover plate beam need to be poured during construction, so that a vertical support is often required to be arranged in the space below the pipe culvert, the construction interference on a main body at the lower part of the foundation pit is large, and certain potential safety hazards exist; in addition, for the pipelines laid in the arc shape, the construction is more complex, the protection needs to be arranged in sections, the occupied area is large, the time and the labor are wasted, and the construction period is long.
Disclosure of Invention
An object of the utility model is to provide a construction convenience is swift, efficient, can effectively adapt to the arc and lay the pipeline, disturb little unsettled combination bridge that is used for foundation ditch top cable assembly normal position protection to foundation ditch lower part main part construction according to prior art's weak point.
The purpose of the utility model is realized through the following ways:
a suspended combined bridge for in-situ protection of a cable group above a foundation pit is structurally characterized by comprising main beams at two sides, an I-shaped cross beam, a U-shaped suspension frame, a long connecting rod and a suspension joist; the two main beams are longitudinally distributed in parallel and are erected on bearing platforms on two sides of the foundation pit and are fixedly connected with the bearing platforms through embedded anchor bolts, a plurality of groups of I-shaped cross beams are distributed perpendicular to the two main beams, two ends of the I-shaped cross beams are fixedly connected with the lower parts of the main beams on the two sides respectively, and two I-shaped cross beams in each group are arranged side by side; one of each group of I-shaped cross beams is articulated with two groups of U-shaped suspension frames, the two upper ends of each U-shaped suspension frame are connected through a stud bolt, the stud bolt seals the opening of the U-shaped suspension frame, the I-shaped cross beam is fixed in the U-shaped suspension frame, and the section width of the I-shaped cross beam is matched with the width of the opening at the inner side of the U-shaped suspension frame; the lower bottoms of the two groups of U-shaped suspension frames are connected with long connecting rods and are connected with two end parts of a suspension joist through the two long connecting rods; and the cable group above the foundation pit is positioned on the suspension joist.
The main beams at the two sides are main bearing structures of the suspended combined bridge and are fixed on bearing platforms at the two sides of the foundation pit in a suspended erecting mode; then a plurality of I-shaped cross beams are distributed among the main beams, and the I-shaped cross beams are connected with a suspension joist which is used for supporting the cable group below through a U-shaped suspension frame and a long connecting rod. Therefore, the utility model only takes the cable group as the protection object, greatly reduces the weight and the volume which need to be born, and no longer needs to arrange a vertical support in the foundation pit, thereby reducing the preparation workload, greatly reducing the construction difficulty, having small construction interference to the main body at the lower part of the foundation pit, convenient and rapid construction and high efficiency; the combined bridge adopts a suspension mode, the U-shaped suspension frame can flexibly adjust the horizontal position on the I-shaped beam according to the position of the cable group, the pipeline laid in an arc shape can be flexibly adapted to the position change of the I-shaped beam, excessive occupied space is not needed, and the combined bridge is simple and light in structure.
The utility model discloses can further specifically do:
the main beam is a Bailey truss main beam and is formed by connecting 321 type Bailey pieces, the Bailey pieces are stacked in parallel in multiple layers, and the center distance between the second row Bailey piece and the first row Bailey piece on the inner side is 0.45 m.
The multilayer parallel stacking is that the two main beams are stacked from the inside (the opposite sides of the two main beams) to the outside in parallel, the two main beams can be stacked in a double-layer mode or stacked in more than three layers, and if a third row of Bailey sheets is needed, the center distance between the second row of Bailey sheets and the third row of Bailey sheets is 0.25 m. The multi-layer stacking can effectively increase the span and the bearing capacity of the combined bridge.
The I-shaped beam is formed by longitudinally splicing a plurality of I-shaped steel bars, and two ends of the I-shaped beam are fixedly connected with the main beam through welding.
The cross beam with the I-shaped section has better bearing performance.
The two ends of the long connecting rod are both provided with bolt heads and are respectively connected with the U-shaped suspension frame and the suspension joist by adopting double nuts correspondingly.
Therefore, the position of the suspension joist on the vertical surface can be adjusted by adjusting the position of the double nuts, so that the position change on the vertical surface when the cable group is laid can be better adapted.
In summary, the utility model provides a suspended combined bridge for in-situ protection of cable groups above a foundation pit; the main beam of the bridge is fixed on bearing platforms at two sides of the foundation pit in a suspension erecting mode, and the I-shaped cross beam is connected with a suspension joist below the I-shaped cross beam for supporting the cable group through a U-shaped suspension frame and a long connecting rod. The utility model has the advantages that the preparation workload is reduced, the construction difficulty is greatly reduced, the construction interference to the main body at the lower part of the foundation pit is small, the construction is convenient and fast, and the efficiency is high; the device can be flexibly adapted to the position change of the arc-shaped laid pipeline without occupying too much land, and has simple and light structure.
Drawings
Fig. 1 is a vertical plane structure schematic diagram of a suspended combination bridge for protecting cable assembly in situ above a foundation pit.
Fig. 2 is a schematic view of a plane structure of a main beam and a beam part in the suspension composite bridge of the present invention.
Fig. 3 is a schematic cross-sectional structure view of the end of the suspended composite bridge of the present invention;
fig. 4 is a schematic cross-sectional structure view of the middle part (not the end part) of the suspension composite bridge according to the present invention;
fig. 5 is a schematic structural view of a suspension portion in the suspension composite bridge according to the present invention;
fig. 6 is a right-view structural diagram of the portion a shown in fig. 5.
The present invention will be further described with reference to the following examples.
Detailed Description
The best embodiment is as follows:
referring to the attached drawings 1, 2, 3 and 4, the suspended combined bridge for in-situ protection of a cable group above a foundation pit comprises two-side main beams 1, an I-shaped cross beam 2, a U-shaped suspension frame 3, a long connecting rod 4 and an angle steel suspension joist 5. The main beams 1 on two sides are beret frame main beams, bearing platforms 6 (concrete bearing platforms) on the upper portions of cast-in-place pile crown beams 7 on two sides of a foundation pit are used as supports of the tail ends of the beret frame main beams of the whole suspension combined bridge, the two main beams 1 are longitudinally distributed in parallel and are erected on the bearing platforms 6 on two sides of the foundation pit, the beret frame main beams 1 are firmly connected with the concrete bearing platforms 6 on the tail ends through embedded anchor bolts 8, and the concrete bearing platforms 6 are 1.25m wide and 2.8m long; the concrete bearing platform 6 is located on the upper parts of the top beams 7 of the cast-in-place piles on the two sides and is supported by the cast-in-place piles on the lower parts of the top beams 7. If no cast-in-place pile or crown beam is available, foundation reinforcement treatment is carried out according to actual foundation bearing capacity and strength indexes. When the cast-in-place pile at the lower part of the concrete bearing platform is constructed, the original structure of the cable group at the outer side of the foundation pit is protected by adopting a U-shaped steel plate with the thickness of 2cm, the plane length of the protective steel plate is 4.2m, the protective steel plate needs to go deep into the lower part of the height of the top of the cast-in-place pile by 1m, the U-shaped turning part at the top is welded in a double-sided mode, and the protective steel plate pile is welded and connected with.
The Bailey truss main beam 1 is a main bearing structure of a suspended combined bridge and is formed by connecting 321 Bailey sheets by I-shaped supporting frames 9, each Bailey sheet is provided with 4I-shaped supporting frames 9 (2 upper and lower Bailey sheets), in order to increase the span and bearing capacity of the bridge, the Bailey sheets forming the main beam can be arranged in parallel in rows or stacked in double layers, the center distance between a second row Bailey sheet and an inner row Bailey sheet is 0.45m, and if a third row Bailey sheet is needed, the center distance between the second row Bailey sheet and the third row Bailey sheet is 0.25 m. The I-steel support frames 9 on two sides of the joint of the adjacent bailey pieces are I-steel and are welded and fixed by steel plates with the width of 24cm and the thickness of 1cm, and the distance between the steel plates is 20 cm.
Referring to the attached figure 2, the I-shaped cross beam 2 is formed by splicing a plurality of sections of I-shaped steel, and two ends of the I-shaped cross beam are fixedly connected with the main beam 1 through welding. The multiple groups of I-shaped cross beams 2 are distributed in parallel and perpendicular to the two main beams 1, each group of I-shaped cross beams is arranged in parallel, and two ends of each cross beam are fixedly connected with the lower parts of the main beams 1 on two sides respectively. The cable group 10 to be protected is laid in an arc shape and is positioned below the I-shaped cross beams 2, and one of the I-shaped cross beams 2 in each group is hung with a suspension device. Two groups of U-shaped suspension frames 3.
With reference to fig. 3, 4, 5 and 6, the suspension device includes two sets of U-shaped suspension frames 3, long connecting rods 4 and suspension joists 5. The I-shaped cross beam 2 is positioned in the two U-shaped suspension frames 3, the width of the cross section of the I-shaped cross beam 2 is matched with the width of an opening at the inner side of the U-shaped suspension frame 3, the two upper ends of the U-shaped suspension frame 3 are connected through the stud bolts 11, the stud bolts 11 seal the opening of the U-shaped suspension frame 3, and the I-shaped cross beam 2 is fixed in the U-shaped suspension frame 3; the lower bottoms of the two groups of U-shaped suspension frames 3 are connected with long connecting rods 4 and are connected with two end parts of a suspension joist 5 through the two long connecting rods 4; and the cable group 10 above the foundation pit is positioned on the angle steel suspension joist 5. The two ends of the long connecting rod 4 are both provided with bolt heads and are respectively connected with the U-shaped suspension frame 3 and the angle steel suspension joist 5 by adopting double nuts correspondingly.
The utility model has the advantages that as follows:
1. the construction efficiency is high: concrete bearing platforms are only needed to be poured at the tail ends of the bailey truss main beams, the combined bridge is arranged in a suspended mode, vertical supports are not arranged in the foundation pit, and construction interference is small.
2. The investment is small: the cable group is used as a protection object, the weight is reduced, and the cable group has strong adaptive deformability, so that the protection structure is simple and the investment is low.
3. The construction speed is fast: vertical braces do not exist in the foundation ditch, simple structure is light, only needs to pour the concrete cushion cap at bailey truss girder end, and all the other are mechanical connection, and maneuverability is strong, and the construction speed is fast.
4. The adjustability is strong: the utility model discloses utilize the characteristics that cable assembly adaptation deformability is strong, cable assembly can suspend in midair the two nuts of joist 5 both sides through the angle steel and realize adjusting from top to bottom, also can suspend in midair the frame through the U type and realize the level (l) ing.
The part of the utility model which is not described is the same as the prior art.
Claims (4)
1. A suspended combined bridge for in-situ protection of a cable group above a foundation pit is characterized by comprising main beams at two sides, I-shaped cross beams, a U-shaped suspension frame, a long connecting rod and suspension joists; the two main beams are longitudinally distributed in parallel and are erected on bearing platforms on two sides of the foundation pit and are fixedly connected with the bearing platforms through embedded anchor bolts, the plurality of I-shaped cross beams are distributed perpendicular to the two main beams, and two ends of the I-shaped cross beams are fixedly connected with the lower parts of the main beams on the two sides respectively; the I-shaped cross beam is positioned in the U-shaped suspension frame, the section width of the I-shaped cross beam is matched with the width of an inner side opening of the U-shaped suspension frame, the two upper ends of the U-shaped suspension frame are connected through a stud bolt, the stud bolt seals the opening of the U-shaped suspension frame, and the I-shaped cross beam is fixed in the U-shaped suspension frame; each I-shaped cross beam is provided with two groups of U-shaped suspension frames, the lower bottoms of the two groups of U-shaped suspension frames are connected with long connecting rods and are connected with the two end parts of one suspension joist through the two long connecting rods; and the cable group above the foundation pit is positioned on the suspension joist.
2. The suspended combined bridge for in-situ protection of cable groups above a foundation pit as claimed in claim 1, wherein the main beam is a Bailey truss main beam which is formed by connecting 321 Bailey sheets, the Bailey sheets are stacked in a multi-layer parallel manner, and the center distance between the second Bailey sheet and the first Bailey sheet on the inner side is 0.45 m.
3. The suspended combination bridge for in-situ protection of cable groups above a foundation pit according to claim 1, wherein the I-shaped beam is formed by longitudinally splicing a plurality of I-shaped steel beams, and two ends of the I-shaped beam are fixedly connected with the main beam through welding.
4. The suspended combined bridge for in-situ protection of the cable group above the foundation pit as claimed in claim 1, wherein the two ends of the long connecting rod are bolt heads and are respectively connected with the U-shaped suspension frame and the suspension joists by adopting double-nut correspondence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921046871.1U CN210368589U (en) | 2019-07-06 | 2019-07-06 | Suspended combined bridge for in-situ protection of cable set above foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921046871.1U CN210368589U (en) | 2019-07-06 | 2019-07-06 | Suspended combined bridge for in-situ protection of cable set above foundation pit |
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| CN210368589U true CN210368589U (en) | 2020-04-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921046871.1U Active CN210368589U (en) | 2019-07-06 | 2019-07-06 | Suspended combined bridge for in-situ protection of cable set above foundation pit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359838A (en) * | 2020-11-13 | 2021-02-12 | 威海市市政工程有限公司 | Safe and environment-friendly construction method for protecting large-span suspended pipeline in foundation pit |
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2019
- 2019-07-06 CN CN201921046871.1U patent/CN210368589U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359838A (en) * | 2020-11-13 | 2021-02-12 | 威海市市政工程有限公司 | Safe and environment-friendly construction method for protecting large-span suspended pipeline in foundation pit |
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Address after: No.158, Dongda Road, Fuzhou, Fujian 350000 Patentee after: Fujian Water Resources and Hydropower Survey, design and Research Institute Co.,Ltd. Address before: 350001 158 Dongda Road, Gulou District, Fuzhou, Fujian Patentee before: FUJIAN PROVINCIAL INVESTIGATION DESIGN & Research Institute OF WATER CONSERVANCY AND HYDROPOWER |