CN112096088A - Steel pipe prestressed steel strand high-altitude pipe penetration construction method - Google Patents
Steel pipe prestressed steel strand high-altitude pipe penetration construction method Download PDFInfo
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- CN112096088A CN112096088A CN202010849933.3A CN202010849933A CN112096088A CN 112096088 A CN112096088 A CN 112096088A CN 202010849933 A CN202010849933 A CN 202010849933A CN 112096088 A CN112096088 A CN 112096088A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
- E04B2001/3583—Extraordinary methods of construction, e.g. lift-slab, jack-block using permanent tensioning means, e.g. cables or rods, to assemble or rigidify structures (not pre- or poststressing concrete), e.g. by tying them around the structure
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
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- Mechanical Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention relates to a steel pipe prestress steel strand high-altitude pipe penetration construction method, which comprises the following steps: providing a steel strand bundle, and dividing the steel strand bundle into a middle part and two end parts along the length direction; arranging an initial steel sleeve in the initial lower chord pipe before the net rack is lifted, and penetrating the steel strand into the initial steel sleeve and enabling two end parts to penetrate out; lifting the net rack to a designed elevation; and sequentially sleeving a splicing steel sleeve and a splicing lower chord pipe on the outer sides of the two end parts of the steel strand bundle, welding and fixing the splicing steel sleeve and the initial steel sleeve, and welding and fixing the splicing lower chord pipe and the initial lower chord pipe. The invention is matched with the construction characteristics of the lifting net rack, optimizes the pipe penetrating construction process of the steel strand, avoids the burning loss of the steel strand caused by welding the lower chord pipe, and avoids the defect that the existing structures at the two sides of the net rack cannot be bypassed in the net rack lifting process.
Description
Technical Field
The invention relates to the field of construction of prestressed net frames, in particular to a steel pipe prestressed steel strand overhead pipe penetrating construction method, which is mainly suitable for prestressed net frames penetrating pipes at high altitude, and is particularly suitable for large-span prestressed trusses adopting integral lifting.
Background
At present, along with the progress of the net rack lifting technology, more and more net rack structures are integrally lifted. However, for the prestressed net frame, the difficulty is increased for the pipe penetrating construction of the prestressed steel strands by adopting an integral lifting mode, and the existing pipe penetrating construction method of the prestressed steel strands mainly comprises the following steps:
1. all high-altitude pipe penetrating modes. The high-altitude pipe penetration method is characterized in that after the net rack is lifted to a design elevation, due to the fact that the prestressed steel strands are long and heavy, especially for a large-span prestressed truss, the high-altitude pipe penetration method is very difficult and high in danger coefficient;
2. and a pipe penetrating mode is adopted at a part of high altitude. The middle part of the steel strand is firstly penetrated in a lower chord tube of the net rack before the net rack is lifted, and two reserved end parts are penetrated in the high altitude after the net rack is lifted.
3. And sleeving a steel sleeve and then penetrating the steel sleeve. The steel sleeve is sleeved in before the steel strand penetrates into the lower chord tube for protection, but the method is not suitable for lifting the net rack, because obstacles exist in the process of lifting the net rack, and the steel sleeve is high in hardness and cannot bend, so that the obstacles cannot be bypassed.
Disclosure of Invention
In order to solve the problems, the invention improves the traditional partial high-altitude pipe penetrating mode and the pipe penetrating mode after steel sleeve sleeving, and provides a high-altitude pipe penetrating construction method for the steel pipe prestressed steel strand, which optimizes the pipe penetrating construction process, not only reduces the construction difficulty, but also saves the construction cost, reduces the high-altitude operation construction danger, and simultaneously avoids the burning loss of the steel strand when the high-altitude pipe penetrating is carried out.
The invention is realized by the following technical scheme: a steel pipe prestress steel strand high-altitude pipe penetration construction method comprises the following steps:
providing a steel strand bundle, and dividing the steel strand bundle into a middle part and two end parts along the length direction;
before the net rack is lifted, arranging an initial steel sleeve in an initial lower chord pipe of the net rack, and penetrating the steel strand into the initial steel sleeve and enabling the two end parts to penetrate out;
lifting the net rack to a designed elevation;
sequentially sleeving a splicing steel sleeve and a splicing lower chord pipe on the outer sides of the two end parts of the steel strand bundle, welding and fixing the splicing steel sleeve and the initial steel sleeve, and welding and fixing the splicing lower chord pipe and the initial lower chord pipe.
The invention matches the construction characteristics of the lifting type net rack, optimizes the pipe penetrating construction process of the steel strand, and avoids the burning loss of the steel strand caused by welding the lower chord pipe and the defect that the existing structures at the two sides of the net rack cannot be wound in the net rack lifting process by a sectional sleeve mode that the steel sleeve is sleeved on the middle part of the net rack corresponding to the steel strand before the net rack is lifted and the steel sleeve is sleeved on the end part of the rod needing to be supplemented after the net rack is lifted.
The steel pipe prestress steel strand high-altitude pipe penetration construction method is further improved in that:
when the splicing steel sleeve and the splicing lower chord pipe are sleeved, penetrating the two ends of the steel strand bundle out of the splicing steel sleeve and the splicing lower chord pipe to form a peeling section;
after the splicing steel sleeve and the splicing lower chord pipe are welded and fixed, stripping the plastic outer sleeve of the stripping section, and sleeving a temporary steel sleeve;
the temporary steel casing is withdrawn in preparation for setting the anchor at the stripping section.
The steel pipe prestress steel strand high-altitude pipe penetration construction method is further improved in that: and marking the serial number of the steel strand on the peeling section after the plastic outer sleeve of the peeling section is peeled off and before the temporary steel sleeve is sleeved.
The steel pipe prestress steel strand high-altitude pipe penetration construction method is further improved in that: the length of the initial steel casing pipe is equal to the length of the initial down-chord pipe.
The steel pipe prestress steel strand high-altitude pipe penetration construction method is further improved in that:
the splicing steel sleeve and the splicing lower chord pipe are of a multi-section splicing structure, and adjacent sections of the splicing steel sleeve and adjacent sections of the splicing lower chord pipe are welded and fixed;
and when the splicing steel sleeve pipe and the splicing lower chord pipe are sleeved, alternately sleeving and fixing the splicing steel sleeve pipe section and the splicing lower chord pipe section by section.
The steel pipe prestress steel strand high-altitude pipe penetration construction method is further improved in that:
before the net rack is lifted, two end parts of the steel strand bundle are folded upwards and temporarily fixed on the net rack;
and when the net rack is lifted to the designed elevation, the temporary fixation is released.
The steel pipe prestress steel strand high-altitude pipe penetration construction method is further improved in that:
a plurality of initial lower chord pipes are arranged on the net rack;
and after the net rack is lifted to the designed elevation, temporarily fixing the steel strand bundle corresponding to the initial lower chord tube and penetrating the steel strand bundle at high altitude one by one.
The steel pipe prestress steel strand high-altitude pipe penetration construction method is further improved in that:
the number of the steel strand bundles is multiple;
when the initial steel sleeve is arranged, arranging a plurality of initial steel sleeves in the initial lower chord pipe, and penetrating a plurality of steel strand bundles into the plurality of initial steel sleeves one by one;
when the splicing steel sleeve and the splicing lower chord pipe are sleeved, one splicing steel sleeve is sleeved outside each steel strand bundle, and one splicing lower chord pipe is sleeved outside the whole splicing steel sleeve.
Drawings
Fig. 1 is a schematic diagram of the matching of steel strands after a net rack is lifted to a design elevation in the steel pipe prestress steel strand high-altitude pipe penetration construction method.
Fig. 2 is a schematic view of the steel strands in the top view of fig. 1 manually set one by one.
FIG. 3 is a schematic view of the temporary steel casing at position M of FIG. 1 after extraction.
Fig. 4 is a schematic sectional view taken along line a-a of fig. 3.
Detailed Description
The invention improves the traditional partial high-altitude pipe penetrating mode and the pipe penetrating mode after sleeving the steel sleeve, provides the high-altitude pipe penetrating construction method for the steel pipe prestressed steel strand, optimizes the pipe penetrating construction process, not only reduces the construction difficulty, but also saves the construction cost, reduces the high-altitude operation construction danger, and simultaneously avoids the burning loss of the steel strand during high-altitude pipe penetrating.
The steel pipe prestress steel strand high-altitude pipe penetration construction method is further explained with reference to the attached drawings.
Referring to fig. 1 and 3, a steel pipe prestress steel strand high-altitude pipe penetration construction method includes the following steps:
step 1, providing a steel strand bundle 20, and dividing the steel strand bundle 20 into a middle part and two end parts along the length direction;
step 2, before the net rack 10 is lifted, arranging an initial steel sleeve (not shown in the figure) in an initial lower chord tube 11 of the net rack 10, and penetrating the steel strand bundle 20 into the initial steel sleeve and enabling the two ends to penetrate out;
step 3, lifting the net rack 10 to a designed elevation;
and 4, sequentially sleeving a splicing steel sleeve 31 and a splicing lower chord pipe 11 'on the outer sides of the two end parts of the steel strand bundle 20, welding and fixing the splicing steel sleeve 31 and the initial steel sleeve, and welding and fixing the splicing lower chord pipe 11' and the initial lower chord pipe 11.
Specifically, the steel strand bundle 20 is an unbonded steel strand, the length of the middle part of the steel strand bundle 20 corresponds to the width of the net rack 10, and the lengths of the two end parts need to be comprehensively determined according to the distance from the net rack 10 to the outside of the net rack to be assembled and the distance to the nearest barrier (such as an existing structural column or a lifting frame) so as to provide conditions for subsequent tensioning operation, and meanwhile, the end parts have certain flexibility so that the nearest barrier can be bypassed in the net rack lifting process.
The invention starts from the requirements of various aspects such as structural characteristics, field regulation, construction measure cost, construction quality and the like, comprehensively considers various factors, optimizes the pipe penetrating construction process, reduces the difficulty and the danger of pipe penetrating at high altitude by a sectional pipe penetrating mode of firstly penetrating an initial sleeve and an initial lower chord pipe 11 in the middle before the net rack 10 is lifted and then penetrating a splicing sleeve 31 and a splicing lower chord pipe 11 ' at the end part after the net rack 10 is lifted, avoids the burning loss caused by welding the lower chord pipe (comprising the welding of the initial lower chord pipe 11, the splicing lower chord pipe 11 ', a splicing pipe 14 for compensating the gap between the splicing lower chord pipe 11 ' and a structure main body to be spliced) of a steel strand bundle 20, and avoids the defect that barriers at two sides of the net rack 10 cannot be bypassed in the lifting process of the net rack 10.
As a preferred embodiment:
when the splicing steel sleeve 31 and the splicing lower chord pipe 11 'are sleeved, two ends of the steel strand bundle 20 penetrate through the splicing steel sleeve 31 and the splicing lower chord pipe 11' to form a peeling section;
after the continuous steel sleeve 31 and the continuous lower chord pipe 11' are welded and fixed, the plastic outer sleeve of the stripping section is stripped (shown in figure 3), and a temporary steel sleeve (not shown in figure) is sleeved;
in preparation for setting the anchor 70 at the stripping section, the temporary steel casing is withdrawn (as in the withdrawn state of fig. 3).
Specifically, the peeling section is used for connecting structural bodies to be spliced outside the net rack 10, in this embodiment, the structural bodies to be spliced are frame columns 40, generally, support balls 41 for fixing are arranged on the tops of the frame columns 40, for the frame columns 40 provided with the support balls 41, the peeling section extends to the support balls 41 and penetrates out of the support balls 41 so as to provide an action point for subsequent tensioning, correspondingly, in order to fully cover and protect the peeling section, the temporary steel sleeve also penetrates through the support balls 41, then the connecting pipe 14 for connecting the continuous lower chord tube 11 'to the frame columns 40 is sleeved outside the temporary steel sleeve and penetrates through the support balls 41, one end of the connecting pipe 14 is welded and fixed with the continuous lower chord tube 11', and the outer wall of the other end is welded and fixed with the inner wall of the support balls 41. Through the arrangement, when the repair pipe 14 is welded and fixed and the steel strand bundle 20 is tensioned, the temporary steel sleeve can effectively protect the peeling section. Certainly, the above is only an embodiment, and for different construction environments, the length and the sleeving time of the temporary steel casing can be flexibly adjusted, so as to fully cover and protect the peeling section in time and space as much as possible.
As a preferred embodiment: after the plastic outer sleeve of the peeling section is peeled off and before the temporary steel sleeve is sleeved, the number of the steel strand is marked on the peeling section.
Specifically, the plastic jacket of each steel strand is usually pasted with a steel strand number, so in the embodiment, after the plastic jacket is stripped and grease on the steel strands is removed, the steel strands on the plastic jacket are moved to the surfaces of the corresponding steel strands, and then the temporary steel sleeve is sleeved on the outer side of the stripping section of the steel jacket, so that each steel strand can be conveniently distinguished in subsequent construction such as tensioning, rod supplementing and the like.
As a preferred embodiment: the length of the initial steel casing is equal to the length of the initial tailpiece 11.
Through the arrangement, the splicing steel sleeve 31 and the initial steel sleeve, and the splicing lower chord pipe 11' and the initial lower chord pipe 11 are convenient to weld and fix.
As a preferred embodiment:
the splicing steel sleeve 31 and the splicing lower chord pipe 11' are both of a multi-section splicing structure, and adjacent sections of the splicing steel sleeve and adjacent sections of the splicing lower chord pipe are welded and fixed;
when the continuous steel sleeve 31 and the continuous lower chord pipe 11' are sleeved in the step 4, the continuous steel sleeve and the continuous lower chord pipe are alternately sleeved and fixed section by section.
Through the multi-section splicing mode, the high-altitude pipe penetrating is more flexible and labor-saving.
As a preferred embodiment:
before the net frame 10 is lifted, the two end parts of the steel strand bundle 20 are folded upwards and temporarily fixed on the net frame 10;
when the net frame 10 is lifted to a designed elevation, the temporary fixing is released.
Through the improvement, the friction of the two end parts of the initial steel pipe at the port part of the initial lower chord pipe 11 is avoided when the net rack 10 is lifted, and the lifting speed is increased.
Specifically, fixing points 12 are provided at upper trusses of the wire frame 10 corresponding to both ends of the initial lower chord pipe 11, both the ends of the steel strand bundle 20 are bent upward to avoid a nearest obstacle, and then fixed to the fixing points 12 by cables 13; when the temporary fixing is released, the cable 13 is released at the end of the fixing point 12 and the end of the strand 20 is then slowly lowered to a position flush with the original tailpiece 11.
Since the net frame 10 has been raised to a design elevation, which is generally higher than an obstacle, when the steel strand bundle 20 is lowered, there is no obstacle to the lowering of the steel strand bundle 20. It is noted that the hoisting frame 50 for hoisting the net rack 10 is usually erected at a high position, and in this embodiment, the hoisting frame 50 is erected on the frame post 40, specifically, the hoisting frame 50 comprises four vertical posts 51 erected on the top of the frame post 40 and a hoisting device arranged at the top ends of the four vertical posts 51, so that when the steel strand bundle 20 is laid down, the hoisting frame 50 will block the lowering and the end threading of the steel strand bundle 20, therefore, when the steel strand bundle 20 is laid down, the steel strand bundle 20 should be laid down obliquely to avoid the hoisting frame 50, when the steel strand bundle 20 is lowered to a position flush with the original lower chord 11, the steel strand bundle 20 is spread, and then the steel strand is manually bent one by one between the vertical posts 51 (as shown in fig. 2).
As a preferred embodiment, with reference to fig. 2:
a plurality of initial lower chord pipes 11 are arranged on the net rack 10;
after the net frame 10 is lifted to the designed elevation, the temporary fixation of the steel strand bundle 20 corresponding to the initial lower chord tube 11 is removed and the high-altitude pipe penetration is performed one by one.
Specifically, the process is performed from one side to the other side along the direction perpendicular to the initial lower chord pipe 11, after one temporary fixing of the steel strand bundle 20 corresponding to the initial lower chord pipe 11 is released, the high-altitude pipe penetration of the steel strand bundle 20 is performed immediately, and during or after the high-altitude pipe penetration of the line, the next temporary fixing is released. In this way, the steel strand bundle 20 is prevented from being blocked by the portion that has finished passing through the pipe at high altitude during the lowering process.
As a preferred embodiment, with reference to fig. 4:
the number of the steel strand bundles 20 is multiple;
when the initial steel sleeve is arranged, a plurality of initial steel sleeves are arranged in the initial lower chord pipe, and a plurality of steel strand bundles 20 are arranged in the initial steel sleeve in a one-to-one penetrating manner;
when the continuous steel sleeve 31 and the continuous lower chord pipe 11 'are sleeved, one continuous steel sleeve 31 is sleeved outside each steel strand bundle 20, and one continuous lower chord pipe 11' is sleeved outside the whole continuous steel sleeve 31.
Specifically, in the case of sheathing the temporary steel sleeves, the number of the temporary steel sleeves is also plural, and the peeling sections of the plural steel strand bundles 20 are sheathed one to one. Through the improvement, the grouped pipe penetrating construction of a large number of steel strands is facilitated, and the groups can be kept mutually isolated.
Further, in order to further isolate and fix the plurality of splicing steel sleeves 31, in the present embodiment, annular partition plates 60 are disposed at intervals along the length direction of the splicing steel sleeves 31, through holes are formed in the annular partition plates 60, through which the splicing steel sleeves 31 are respectively inserted and fixed, inner walls of the through holes are fixed to outer walls of the splicing steel sleeves 31, and outer walls of the annular partition plates 60 are fixed to inner walls of the splicing lower chord pipes 11'. Of course, an annular partition may also be provided for a portion of the initial steel casing in the manner described above to isolate and secure a plurality of initial steel casings.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (8)
1. A steel pipe prestress steel strand high-altitude pipe penetration construction method is characterized by comprising the following steps:
providing a steel strand bundle, and dividing the steel strand bundle into a middle part and two end parts along the length direction;
before the net rack is lifted, arranging an initial steel sleeve in an initial lower chord pipe of the net rack, and penetrating the steel strand into the initial steel sleeve and enabling the two end parts to penetrate out;
lifting the net rack to a designed elevation;
sequentially sleeving a splicing steel sleeve and a splicing lower chord pipe on the outer sides of the two end parts of the steel strand bundle, welding and fixing the splicing steel sleeve and the initial steel sleeve, and welding and fixing the splicing lower chord pipe and the initial lower chord pipe.
2. The steel pipe prestressed steel strand high-altitude pipe penetration construction method of claim 1, characterized in that:
when the splicing steel sleeve and the splicing lower chord pipe are sleeved, penetrating the two ends of the steel strand bundle out of the splicing steel sleeve and the splicing lower chord pipe to form a peeling section;
after the splicing steel sleeve and the splicing lower chord pipe are welded and fixed, stripping the plastic outer sleeve of the stripping section, and sleeving a temporary steel sleeve;
the temporary steel casing is withdrawn in preparation for setting the anchor at the stripping section.
3. The steel pipe prestressed steel strand high-altitude pipe penetration construction method of claim 2, characterized in that: and marking the serial number of the steel strand on the peeling section after the plastic outer sleeve of the peeling section is peeled off and before the temporary steel sleeve is sleeved.
4. The steel pipe prestressed steel strand high-altitude pipe penetration construction method of claim 1, characterized in that: the length of the initial steel casing pipe is equal to the length of the initial down-chord pipe.
5. The steel pipe prestressed steel strand high-altitude pipe penetration construction method of claim 1, characterized in that:
the splicing steel sleeve and the splicing lower chord pipe are of a multi-section splicing structure, and adjacent sections of the splicing steel sleeve and adjacent sections of the splicing lower chord pipe are welded and fixed;
and when the splicing steel sleeve pipe and the splicing lower chord pipe are sleeved, alternately sleeving and fixing the splicing steel sleeve pipe section and the splicing lower chord pipe section by section.
6. The steel pipe prestressed steel strand high-altitude pipe penetration construction method of claim 1, characterized in that:
before the net rack is lifted, two end parts of the steel strand bundle are folded upwards and temporarily fixed on the net rack;
and when the net rack is lifted to the designed elevation, the temporary fixation is released.
7. The steel pipe prestressed steel strand high-altitude pipe penetration construction method of claim 6, characterized in that:
a plurality of initial lower chord pipes are arranged on the net rack;
and after the net rack is lifted to the designed elevation, temporarily fixing the steel strand bundle corresponding to the initial lower chord tube and penetrating the steel strand bundle at high altitude one by one.
8. The steel pipe prestressed steel strand high-altitude pipe penetration construction method of claim 1, characterized in that:
the number of the steel strand bundles is multiple;
before setting an initial steel sleeve, arranging a plurality of initial steel sleeves in the initial lower chord pipe, and penetrating a plurality of steel strand bundles into the plurality of initial steel sleeves one by one;
when the splicing steel sleeve and the splicing lower chord pipe are sleeved, one splicing steel sleeve is sleeved outside each steel strand bundle, and one splicing lower chord pipe is sleeved outside the whole splicing steel sleeve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010849933.3A CN112096088B (en) | 2020-08-21 | 2020-08-21 | Steel pipe prestressed steel strand high-altitude pipe penetration construction method |
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| CN202010849933.3A CN112096088B (en) | 2020-08-21 | 2020-08-21 | Steel pipe prestressed steel strand high-altitude pipe penetration construction method |
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| CN112096088B (en) | 2021-11-09 |
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