CN112324150A - A single-layer saddle-shaped cable net tensioning construction method - Google Patents
A single-layer saddle-shaped cable net tensioning construction method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 48
- 239000002356 single layer Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 83
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 4
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- 238000010586 diagram Methods 0.000 description 10
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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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- 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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- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
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Abstract
本发明涉及一种预应力空间结构施工方法，特别是一种单层马鞍形索网结构施工方法，包括索网张拉，所述索网张拉包括纵向索张拉过程、横向索张拉过程，所述纵向索张拉过程、横向索张拉过程同时进行或依次交错进行。单层马鞍形索网屋盖作为一种新型结构体系，索的施工顺序和张拉顺序对索结构的整体成型以及内力重分布有着重大影响，但目前高空组装方案采用稳定横向索张拉、纵向受力索张拉方案，均存在挠度变形大于规范限值，稳定索和受力索完成态索力小于原设计目标，环梁内力低于原设计值，且分布极其不均匀等问题。本发明在施工过程中确保纵向索、横向索同时张拉，使纵向索、横向索的完成态索力符合原设计目标，挠度分布均匀。
The invention relates to a construction method for a prestressed space structure, in particular to a construction method for a single-layer saddle-shaped cable-net structure, including cable-net tensioning, wherein the cable-net tensioning includes a longitudinal cable tensioning process and a lateral cable tensioning process , the longitudinal cable tensioning process and the transverse cable tensioning process are performed simultaneously or in a staggered sequence. The single-layer saddle-shaped cable net roof is a new type of structural system. The construction sequence and tensioning sequence of the cables have a significant impact on the overall formation of the cable structure and the redistribution of internal forces. However, the current high-altitude assembly scheme adopts stable lateral The tensioning schemes of the stressed cables all have the problems that the deflection deformation is greater than the specification limit, the cable forces of the stabilized cables and the stressed cables in the finished state are less than the original design target, the internal force of the ring beam is lower than the original design value, and the distribution is extremely uneven. The invention ensures that the longitudinal cables and the transverse cables are stretched at the same time in the construction process, so that the completed state cable forces of the longitudinal cables and the transverse cables conform to the original design target, and the deflection distribution is uniform.
Description
Technical Field
The invention relates to a construction method of a prestressed space structure, in particular to a construction method of a single-layer saddle-shaped cable net structure.
Background
At present, the construction of the cable net and the inhaul cable generally adopts two methods of inhaul cable integral lifting and inhaul cable high-altitude assembling. The inhaul cable integral lifting method includes firstly assembling a cable net and a tooling cable on a ground structure, then integrally and synchronously lifting the inhaul cable to a roof in place, and detaching a temporary support for tensioning. The single-layer saddle-shaped cable net structure is generally applied to stands and swimming pools, the height drop of the lower site is large, an integral lifting scheme is adopted, an auxiliary operation surface needs to be additionally arranged, the requirement on temporary support is high, and the construction steps and the construction of other work types on site inevitably generate cross operation of construction sequences, so that the construction organization on site is not facilitated. Therefore, the single-layer saddle-shaped cable net roof generally adopts a high-altitude assembly scheme.
As a novel structure system, the construction sequence and the tensioning sequence of cables have great influence on the integral forming and internal force redistribution of a cable structure, but the conventional high-altitude assembly scheme adopts stable transverse cable tensioning and longitudinal stressed cable tensioning schemes, so that the problems that the deflection deformation is greater than a standard limit value, the finished cable force of a stable cable and a stressed cable is less than an original design target, the internal force of a ring beam is lower than an original design value, the distribution is extremely uneven and the like exist.
Disclosure of Invention
The invention provides a tension construction method for a single-layer saddle-shaped cable net, which solves the problem of uneven deflection distribution caused by the existing construction technology of single-layer saddle-shaped cables.
The invention provides a single-layer saddle-shaped cable net tensioning construction method which comprises cable net tensioning, wherein the cable net tensioning comprises a longitudinal cable tensioning process and a transverse cable tensioning process, and the longitudinal cable tensioning process and the transverse cable tensioning process are carried out simultaneously or sequentially in a staggered mode.
Further, the longitudinal cable tensioning process is as follows:
and tensioning longitudinal central cables from the longitudinal two ends of the saddle-shaped steel structure, and symmetrically tensioning a plurality of longitudinal cables at two sides of the longitudinal central cables.
Further, the transverse cable tensioning process is as follows:
and stretching the transverse central cables from the two transverse ends of the saddle-shaped steel structure, and symmetrically stretching a plurality of transverse cables at two sides of the transverse central cables.
Furthermore, the plurality of longitudinal cables are divided into two groups and symmetrically arranged on two sides of the longitudinal central cable, and in the process of tensioning the longitudinal cables, the longitudinal cables close to the longitudinal central cable are sequentially tensioned to positions far away from the longitudinal central cable; the transverse cables are divided into two groups and symmetrically arranged on two sides of the transverse central cable, and in the tensioning process of the transverse cables, the transverse cables close to the transverse central cable start to be sequentially tensioned to positions far away from the transverse central cable.
Furthermore, the specific construction processes of the longitudinal cable tensioning process and the transverse cable tensioning process are as follows:
step 1: tensioning the longitudinal central cable and the transverse central cable on the saddle-shaped steel structure until the longitudinal central cable and the transverse central cable finish the tensioning process;
step 2: two longitudinal cables are symmetrically tensioned on two sides of the longitudinal central cable, and two transverse cables are symmetrically tensioned on two sides of the transverse central cable;
and step 3: repeating the step 2 until the longitudinal cable tensioning process and/or the transverse cable tensioning process are completed;
and 4, step 4: if the longitudinal cable tensioning process or the transverse cable tensioning process is not finished, the longitudinal cable tensioning process or the transverse cable tensioning process is continued, and cable net tensioning is finished.
Furthermore, the longitudinal central cable and the longitudinal cable are all stressed cables.
Furthermore, the transverse central cable and the transverse cables are stabilizing cables.
Furthermore, the longitudinal cable tensioning process and the transverse cable tensioning process are both high-altitude tensioning processes.
Further, the method comprises the following specific steps:
step 1: mounting a steel structure jig frame;
step 2: mounting a roof ring beam;
and step 3: mounting a peripheral V support;
and 4, step 4: the roof stay cable is in place at high altitude;
and 5: tensioning the cable net;
step 6: and (5) installing the membrane roof.
Furthermore, the tensioning of the cable net also comprises a fine adjustment pre-tensioning process, and the fine adjustment pre-tensioning process is carried out after the longitudinal cable tensioning process and the transverse cable tensioning process are finished.
Compared with the prior art, the invention ensures that the longitudinal cable and the transverse cable are simultaneously tensioned in the construction process, so that the finished cable force of the longitudinal cable and the transverse cable meets the original design target, and the deflection is uniformly distributed.
Drawings
FIG. 1 is a drawing of a tensioning scheme of the present invention;
FIG. 2 is a diagram of the deflection change during the step simulated by simultaneous tension construction of the longitudinal and transverse cables;
FIG. 3 is a diagram of the change of the cable force of the stressed cable in the step of simultaneous tension construction of the longitudinal and transverse cables;
FIG. 4 is a diagram of a cable force change situation of a stabilizing cable in a step simulated by simultaneous tension construction of longitudinal and transverse cables;
FIG. 5 is a diagram of the change of the internal force of the simulated walking ring beam during simultaneous tension construction of the longitudinal and transverse cables;
FIG. 6 is a schematic view of a tension scheme of a transverse stabilizer cable in comparative example 1;
FIG. 7 is a diagram showing the change of deflection in a simulated step of a stable cable tensioning construction according to comparative example 1;
FIG. 8 is a diagram showing a change of a cable force of a stressed cable in a simulation step of a stable cable tensioning construction in a comparative example 1;
FIG. 9 is a diagram showing a variation of a cable force of a stabilizing cable in a step of simulating the tension construction of the stabilizing cable in comparative example 1;
FIG. 10 is a graph showing the variation of the internal force of a simulated walking beam in the tension construction of a stabilizing cable in comparative example 1;
FIG. 11 is a diagram illustrating a longitudinal force-bearing cable tension scheme in comparative example 2;
FIG. 12 is a diagram showing the deflection change in a simulated step of the tension construction of a stress cable in the comparative example 2;
FIG. 13 is a graph showing the variation of the cable force of the stressed cable in the simulation step of the tensioned cable construction of the stressed cable in the comparative example 2;
FIG. 14 is a diagram showing a cable force change situation of a stabilizing cable in a simulation step of a tension construction of a stressed cable in a comparative example 2;
FIG. 15 is a graph showing the variation of the internal force of a simulated walking beam in the tension construction of a stressed cable in the comparative example 2;
FIG. 16, a graph comparing deflection for three tensioning schemes;
figure 17, longitudinal cable force comparison of three tensioning schemes.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
The embodiment of the invention discloses a single-layer saddle-shaped cable net tensioning construction method, which comprises the following steps:
step 1: mounting a steel structure jig frame;
step 2: mounting a roof ring beam;
and step 3: mounting a peripheral V support;
and 4, step 4: the roof stay cable is in place at high altitude;
and 5: tensioning the cable net;
step 6: and (5) installing the membrane roof.
The cable net tensioning comprises a longitudinal cable tensioning process and a transverse cable tensioning process, as shown in fig. 1, the longitudinal cable tensioning process and the transverse cable tensioning process are carried out simultaneously and are all high-altitude tensioning. The longitudinal cable tensioning process is as follows: and tensioning longitudinal central cables from the longitudinal two ends of the saddle-shaped steel structure, and symmetrically tensioning a plurality of longitudinal cables at two sides of the longitudinal central cables. The transverse cable tensioning process is as follows: and stretching the transverse central cables from the two transverse ends of the saddle-shaped steel structure, and symmetrically stretching a plurality of transverse cables at two sides of the transverse central cables.
As shown in figure 1, the number of the longitudinal cables is 14, the longitudinal cables are divided into two groups and symmetrically arranged on two sides of the longitudinal central cable, the number of the longitudinal central cable is No. 1, and the numbers of the longitudinal cables are 2-8 in sequence from inside to outside. The number of the transverse cables is 24, the transverse cables are divided into two groups and symmetrically arranged on two sides of the transverse central cable, the number of the transverse central cable is No. 1, and the numbers of the transverse cables are 2-13 from inside to outside. In the process of tensioning the longitudinal cables, sequentially tensioning the longitudinal cables from the longitudinal cable No. 2 close to the longitudinal central cable No. 1 to a position far away from the longitudinal central cable; in the process of stretching the transverse cables, the transverse cables 2 close to the transverse central cable 1 are sequentially stretched to positions far away from the transverse central cable.
The specific construction process of the longitudinal cable tensioning process and the transverse cable tensioning process in the embodiment of the invention is as follows:
step 1: tensioning the longitudinal central cable and the transverse central cable on the saddle-shaped steel structure until the longitudinal central cable and the transverse central cable finish the tensioning process;
step 2: two longitudinal cables are symmetrically tensioned on two sides of the longitudinal central cable, and two transverse cables are symmetrically tensioned on two sides of the transverse central cable;
and step 3: repeating the step 2 until the longitudinal cable tensioning process and/or the transverse cable tensioning process are completed;
and 4, step 4: and after the longitudinal cable tensioning process is finished, part of the transverse cables are not tensioned, and the transverse cable tensioning process is continued to finish cable net tensioning.
And after the longitudinal cable tensioning process and the transverse cable tensioning process are finished, carrying out a fine-adjustment pretensioning process.
The deformation and the internal force change of the cable are tested in the construction process of the embodiment of the invention, and the results are shown in fig. 2-5 and table 1.
TABLE 1 Simultaneous longitudinal and transverse cable tensioning scheme for deformation and internal force under various working conditions
The scheme for simultaneously tensioning the longitudinal and transverse cables adopts a scheme of symmetrically tensioning the middle part and the two sides, and simultaneously tensioning the longitudinal and transverse cables correspondingly. The vertical deflection change amplitude of the stay cable is between +103mm and-37 mm in the tensioning process of the stay cable, the integral change amplitude is small, and the finished vertical deflection is-310 mm and basically kept consistent with the designed deflection 295 mm; meanwhile, the cable force and the ring beam internal force are kept consistent with the original design; the force distribution in the ring beam is more uniform.
In order to verify the effect of the construction method, a comparison example is given for comparison.
Comparative example 1
The comparative example 1 of the present invention employs a lateral stable cable tensioning scheme, and as shown in fig. 6, the stable cable employs a symmetrical tensioning scheme in the middle and in the two sides.
The deformation and the change of the internal force of the stabilizing wire during the construction process were measured, and the results are shown in fig. 7 to 10 and table 2.
Table 2: deformation and internal force of each working condition of stable cable tensioning scheme
In the tensioning scheme of the stable cable in the comparative example 1, the vertical deflection deformation of the stable cable is always greater than the standard limit value in the tensioning process, and after the tensioning is finished, the maximum finished deformation reaches 515mm and exceeds the standard limit value; meanwhile, the finished state cable force of the stable cable and the stressed cable in the comparative example 1 is smaller than the original design target; the internal force of the ring beam is lower than the original design value, and the distribution is extremely uneven, so that great hidden danger exists.
Comparative example 2
In the longitudinal stress cable tensioning scheme of the comparative example 2, as shown in fig. 11, the stress cable tensioning scheme adopts a symmetrical tensioning scheme of first middle part and then two sides.
The deformation and the change of the internal force of the stabilizing wire during the construction process were measured, and the results are shown in fig. 12 to 15 and table 3.
TABLE 3 deformation and internal force of stressed cable in tension scheme
In the comparison example 2 of the invention, after the first stressed cable is tensioned, the midspan deflection reaches 374mm, and in the subsequent continuous tensioning process, the deflection value slowly decreases, after the membrane roof is laid, the deformation is +/-141 mm, and the complete deformation is-42 mm. The finished state deformation is smaller than that of the initial design; but the finished state cable force of the stable cable and the stressed cable is smaller than the design target as the stable cable tensioning scheme; the internal force of the ring beam is lower than the original design value and is distributed unevenly.
According to comparative analysis of the three tensioning schemes and as shown in the figures 16 and 17, the adoption of the synchronous longitudinal and transverse cable tensioning scheme can effectively keep the configuration of the building in a tensioning completion state, and the longitudinal cable force can continuously increase to a target pre-tension value, so that the integral rigidity and stress of the single-layer cable net structure are ensured.
Finally, it should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the modifications and equivalents of the specific embodiments of the present invention can be made by those skilled in the art after reading the present specification, but these modifications and variations do not depart from the scope of the claims of the present application.
Claims (10)
1. The single-layer saddle-shaped cable net tensioning construction method is characterized by comprising cable net tensioning, wherein the cable net tensioning comprises a longitudinal cable tensioning process and a transverse cable tensioning process, and the longitudinal cable tensioning process and the transverse cable tensioning process are carried out simultaneously or sequentially in a staggered mode.
2. A single-layer saddle-shaped cable net tensioning construction method according to claim 1, wherein the longitudinal cable tensioning process is as follows:
and tensioning longitudinal central cables from the longitudinal two ends of the saddle-shaped steel structure, and symmetrically tensioning a plurality of longitudinal cables at two sides of the longitudinal central cables.
3. A single-layer saddle-shaped cable net tensioning construction method according to claim 2, wherein the transverse cable tensioning process is as follows:
and stretching the transverse central cables from the two transverse ends of the saddle-shaped steel structure, and symmetrically stretching a plurality of transverse cables at two sides of the transverse central cables.
4. A single-layer saddle-shaped cable net tensioning construction method according to claim 3, wherein the plurality of longitudinal cables are divided into two groups and symmetrically arranged on two sides of the longitudinal central cable, and during tensioning of the longitudinal cables, the longitudinal cables are sequentially tensioned from the longitudinal cable close to the longitudinal central cable to the position far away from the longitudinal central cable; the transverse cables are divided into two groups and symmetrically arranged on two sides of the transverse central cable, and in the tensioning process of the transverse cables, the transverse cables close to the transverse central cable start to be sequentially tensioned to positions far away from the transverse central cable.
5. The tension construction method of the single-layer saddle-shaped cable net is characterized in that the specific construction processes of the longitudinal cable tension process and the transverse cable tension process are as follows:
step 1: tensioning the longitudinal central cable and the transverse central cable on the saddle-shaped steel structure until the longitudinal central cable and the transverse central cable finish the tensioning process;
step 2: two longitudinal cables are symmetrically tensioned on two sides of the longitudinal central cable, and two transverse cables are symmetrically tensioned on two sides of the transverse central cable;
and step 3: repeating the step 2 until the longitudinal cable tensioning process and/or the transverse cable tensioning process are completed;
and 4, step 4: if the longitudinal cable tensioning process or the transverse cable tensioning process is not finished, the longitudinal cable tensioning process or the transverse cable tensioning process is continued, and cable net tensioning is finished.
6. The tension construction method of the single-layer saddle-shaped cable net according to claim 2, wherein the longitudinal central cable and the longitudinal cable are all stressed cables.
7. The tension construction method of the single-layer saddle-shaped cable net according to claim 3, wherein the transverse central cables and the transverse cables are stabilizing cables.
8. The tension construction method of the single-layer saddle-shaped cable net is characterized in that the longitudinal cable tension process and the transverse cable tension process are high-altitude tension processes.
9. The tension construction method of the single-layer saddle-shaped cable net is characterized by comprising the following specific steps of:
step 1: mounting a steel structure jig frame;
step 2: mounting a roof ring beam;
and step 3: mounting a peripheral V support;
and 4, step 4: the roof stay cable is in place at high altitude;
and 5: tensioning the cable net;
step 6: and (5) installing the membrane roof.
10. The tension construction method of the single-layer saddle-shaped cable net is characterized in that the tension of the cable net further comprises a fine adjustment pre-tensioning process, and the fine adjustment pre-tensioning process is carried out after the longitudinal cable tension process and the transverse cable tension process are completed.
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Cited By (1)
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