CN110513122B - Prestressed truss support system and method for pipe curtain construction - Google Patents
Prestressed truss support system and method for pipe curtain construction Download PDFInfo
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- CN110513122B CN110513122B CN201910732903.1A CN201910732903A CN110513122B CN 110513122 B CN110513122 B CN 110513122B CN 201910732903 A CN201910732903 A CN 201910732903A CN 110513122 B CN110513122 B CN 110513122B
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- 238000010276 construction Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 239000002689 soil Substances 0.000 claims abstract description 12
- 230000002411 adverse Effects 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims abstract description 7
- 238000005452 bending Methods 0.000 claims abstract description 5
- 238000009412 basement excavation Methods 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Geochemistry & Mineralogy (AREA)
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Abstract
The invention relates to a prestressed truss support system and a method for pipe roof construction, wherein a transverse truss in a transverse prestressed truss structure support system in the system transversely supports an upper pipe roof and an earthing load, the transverse truss is arranged on two sides of a vertical support truss in a vertical truss support system, and the vertical support truss supports a vertical load transmitted by the upper transverse truss and pressure loads of soil bodies on the two sides; the lower part of the transverse truss is additionally provided with prestressed steel strands, and two ends of each prestressed steel strand are anchored on two sides of the vertical supporting truss respectively. The whole supporting system mainly relates to vertical truss supports on two sides of the pipe curtain, the truss system in the transverse span direction is combined with the characteristics of soil covering load stress on the pipe curtain, the truss with variable height is set adaptively, and meanwhile, arc-shaped prestressed steel stranded wires are additionally arranged on the lower portion of the transverse truss and anchored on two sides of the vertical supporting truss so as to resist the adverse effect of large-depth soil covering of the pipe curtain structure on large transverse supporting midspan bending moment.
Description
Technical Field
The invention relates to a supporting system for an internal support in underground channel pipe curtain construction, in particular to a supporting system for a pipe curtain internal support combined prestressed truss structure, which is used in large-section pipe curtain construction and is used when the transverse span is increased.
Background
Along with the rapid development of cities, the development and utilization of underground spaces are accelerated gradually, and how to reasonably and effectively utilize the underground spaces of the cities becomes a common problem in all big cities in the world. In order to reduce the influence on urban ground roads, pipelines and buildings (structures), the underground excavation process is gradually the first choice for building underground structures in complex environments.
The pipe curtain construction method has low requirements on construction space and small influence on the surrounding environment, and particularly has unique advantages and is developed and applied when the construction of urban underground passages, important buildings and pipeline protection construction are carried out. Meanwhile, the traditional pipe roof construction usually needs to be provided with an inner support system for controlling vertical and lateral load pressure in an excavation stage, as shown in fig. 1, a plurality of vertical supports are additionally arranged in the transverse span direction to cause adverse effects of small space influence on construction, and because the upper soil covering load is large, the vertical and transverse distances of the inner supports are small, more pipe roof underground excavation space support obstacles are caused, and the excavation efficiency of pipe roof construction is greatly influenced. How to vacate the sufficient space of the follow-up undercut of pipe curtain and structure construction as far as possible under the prerequisite of supporting structure safety in the pipe curtain to increase the efficiency of pipe curtain construction is a difficult problem that awaits the opportune moment and solves.
Disclosure of Invention
The invention provides a prestressed truss support system and a method for pipe curtain construction, wherein a pipe curtain inner support combined prestressed truss structure support system is adopted, and by arranging a cross truss with variable cross-section height and adding prestress, the span of the cross truss is greatly increased, and enough space is provided for pipe curtain excavation construction, so that the construction efficiency of pipe curtain structure excavation and subsequent structure construction is greatly improved.
In order to achieve the purpose, the technical scheme of the invention is as follows: a prestressed truss support system for pipe roof construction comprises a transverse prestressed truss structure support system and a vertical truss support system, wherein a transverse truss in the transverse prestressed truss structure support system transversely supports an upper pipe roof and earthing loads, transverse trusses are arranged on two sides of a vertical support truss in the vertical truss support system, and the vertical support truss supports vertical loads transmitted by the transverse truss on the upper part and pressure loads of soil bodies on the two sides; the lower part of the transverse truss is additionally provided with prestressed steel strands, and two ends of each prestressed steel strand are anchored on two sides of the vertical support truss respectively so as to resist adverse effects of large-depth covering soil of the pipe curtain structure on large bending moment of the transverse support span.
Furthermore, the transverse truss is combined with the stress characteristic of the soil-covered load on the pipe curtain, the truss with variable height is adaptively set, and prestress is added by setting the height of the variable cross section for increasing the span of the transverse truss.
Further, the transverse truss is composed of an upper chord member, a lower chord member, web members and connecting rods, a plurality of web members are connected between the upper chord member and the lower chord member, the connecting rods are connected between adjacent web members, and the web members are gradually increased from two sides to midspan.
Furthermore, a guide sliding groove for arranging the stress steel strands is arranged below the plurality of web members of the transverse truss.
A construction method of a prestressed truss support system for pipe curtain construction comprises the following steps:
1) performing early-stage pipe curtain enclosure construction to form a closed pipe curtain enclosure structure;
2) constructing a vertical truss support system:
the vertical truss support structure is close to the left and right pipe curtain enclosure structures, the chord members on the two sides are constructed in sequence, and then the middle web members and the connecting rods are welded to form a vertical truss support system;
3) constructing a transverse prestressed truss structure supporting system:
firstly, welding and installing an upper chord member and a lower chord member, secondly, welding and installing a web member and a connecting rod inside a transverse truss, secondly, installing prestressed steel strands, arranging the prestressed steel strands along a guide sliding chute, ensuring smooth radian of the steel strands in the implementation process, and finally, configuring and tensioning the prestressed steel strands according to the requirement and anchoring the prestressed steel strands to the two end parts of the vertical support truss by using an anchorage device by combining upper load and calculation requirement;
4) sequentially carrying out slope excavation and mounting of a prestressed truss support system until the pipe curtain channel is excavated and communicated;
5) and (5) completing construction of the internal structure of the pipe curtain channel, and dismantling the prestressed truss support system after the design strength is reached.
The invention has the beneficial effects that:
the whole supporting system mainly relates to vertical truss supports on two sides of a pipe curtain and a truss system in the transverse span direction, the transverse truss system is combined with the soil-covering load stress characteristic of the pipe curtain and is adaptively set into a truss with variable height, and meanwhile, arc-shaped prestressed steel stranded wires are additionally arranged on the lower portion of the transverse truss and anchored on two sides of the vertical supporting truss so as to resist the adverse effect of large-depth soil covering of the pipe curtain structure on large bending moment of a transverse supporting span. Through the variable cross-section height setting and add prestressing force, greatly increased the span of horizontal truss, also avoided traditional pipe roof inner supporting structure horizontal span direction to add a plurality of vertical braces simultaneously and caused the adverse effect (like fig. 1) that the space influences the construction a little, for pipe roof excavation construction provides sufficient space, improved the efficiency of construction of pipe roof structure excavation and follow-up structure construction greatly.
Drawings
FIG. 1 is a schematic diagram of the internal support arrangement of a traditional common truss-free prestressed system pipe curtain;
FIG. 2 is a cross-sectional view of the inner support of the tube sheet composite pre-stressed truss structure of the present invention;
FIG. 3 is a schematic longitudinal cross-sectional view of the support system in the A-A tube sheet combined prestressed truss structure of FIG. 2;
FIG. 4 is a schematic view of the working conditions of the construction steps a to f of the inner support system in the pipe curtain combined prestressed truss structure.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description.
As shown in fig. 2 and 3, the prestressed truss support system for pipe curtain construction of the present invention mainly comprises:
1) a transverse prestressed truss structure supporting system for transversely supporting an upper pipe curtain and earthing load mainly comprises an upper chord member 1, a lower chord member 2, web members 3, a connecting rod 4, prestressed steel strands 5, a guide sliding groove 6 and an anchorage device 7. The transverse truss is composed of an upper chord member 1, a lower chord member 2, web members 3 and connecting rods 4, wherein the web members 3 are connected between the upper chord member 1 and the lower chord member 2, and the connecting rods 4 are connected between the adjacent web members 3. The soil covering stress of the transverse truss is gradually increased from two sides to the middle of the span L in combination with the height of the truss, meanwhile, the arc-shaped prestressed steel strand 5 is additionally arranged at the lower part of the transverse truss, and the transverse truss is anchored at two sides of the vertical supporting truss by using the anchorage device 7 so as to resist the adverse effect of large-depth soil covering of the pipe curtain structure 9 on large bending moment of the transverse supporting span. The stress steel strands 5 are guided by a guide runner 6.
2) The vertical truss support system 8 for ensuring vertical support is composed of vertical support trusses on two sides, and the vertical support trusses are mainly composed of chord members on two sides, a middle web member and a connecting rod. The main function of the device is to support the vertical load transferred by the upper transverse truss and the pressure load of the soil bodies on two sides.
As shown in fig. 4, the specific implementation method and steps of the present invention are as follows:
1) and the early-stage pipe curtain enclosure construction is good, so that a closed pipe curtain enclosure is formed.
2) Construction of vertical truss support system (a of fig. 4): the vertical truss system is close to the left and right pipe curtain enclosure structures, the chord members on the two sides are constructed in sequence, and then the middle web members and the connecting rods are welded to form the vertical truss system.
3) Construction of transverse prestressed truss structure support system (b of fig. 4): the transverse prestressed truss structure supporting system mainly comprises an upper chord member 1, a lower chord member 2, web members 3, a connecting rod 4, prestressed steel strands 5, a guide sliding groove 6 and an anchorage 7. During specific implementation, the upper chord member 1 and the lower chord member 2 are welded and installed firstly, the web members 3 and the connecting rods 4 inside the truss are welded and installed secondly, then the prestressed steel strands 5 (c in fig. 4) are installed, the prestressed steel strands 5 are arranged along the guide sliding grooves 6, the radian of the prestressed steel strands 5 is guaranteed to be smooth as much as possible in the implementation process, and finally the prestressed steel strands 5 are configured and tensioned as required and anchored at two ends of the truss through the anchors 7 according to upper load and calculation requirements.
4) And (4) sequentially carrying out slope excavation (d in figure 4) and installing the prestressed inner supports (e in figure 4) until the pipe curtain channel is excavated and communicated.
5) And (f) finishing the construction of the internal structure of the pipe curtain channel (in the figure 4), and removing the truss prestress internal support system after the design strength is reached.
Claims (3)
1. The utility model provides a prestressing force truss support system for pipe curtain construction, includes horizontal prestressing force truss structure braced system, vertical truss braced system, its characterized in that: a transverse truss in the transverse prestressed truss structure supporting system transversely supports an upper pipe roof and an earthing load, the transverse truss is arranged on two sides of a vertical supporting truss in the vertical truss supporting system, and the vertical supporting truss supports the vertical load transmitted by the transverse truss on the upper part and the pressure loads of soil bodies on two sides; the lower part of the transverse truss is additionally provided with prestressed steel strands, and two ends of each prestressed steel strand are anchored on two sides of the vertical support truss respectively so as to resist the adverse effect of large-depth covering soil of the pipe curtain structure on large bending moment of a transverse support span; the transverse truss is combined with the stress characteristic of the soil-covered load on the pipe curtain, is adaptively set into a truss with variable height, and is additionally prestressed by setting the height of a variable cross section for increasing the span of the transverse truss; the transverse truss is composed of an upper chord member, a lower chord member, web members and connecting rods, a plurality of web members are connected between the upper chord member and the lower chord member, the connecting rods are connected between adjacent web members, and the web members are gradually increased from two sides to midspan.
2. The prestressed truss support system for pipe curtain construction as claimed in claim 1, wherein: and guide sliding chutes for arranging prestressed steel strands are arranged below the plurality of web members of the transverse truss.
3. A construction method of the prestressed girder support system for pipe curtain construction as set forth in claim 1 or 2, wherein: the method comprises the following steps:
1) performing early-stage pipe curtain enclosure construction to form a closed pipe curtain enclosure structure;
2) constructing a vertical truss support system:
the vertical truss support structure is close to the left and right pipe curtain enclosure structures, the chord members on the two sides are constructed in sequence, and then the middle web members and the connecting rods are welded to form a vertical truss support system;
3) constructing a transverse prestressed truss structure supporting system:
firstly, welding and installing an upper chord member and a lower chord member, secondly, welding and installing a web member and a connecting rod inside a transverse truss, secondly, installing prestressed steel strands, arranging the prestressed steel strands along a guide sliding chute, ensuring smooth radian of the steel strands as much as possible in the implementation process, and finally, configuring and tensioning the prestressed steel strands according to the requirement and anchoring the prestressed steel strands to the two end parts of the vertical support truss by using an anchorage device by combining the upper load and the calculation requirement;
4) sequentially carrying out slope excavation and mounting of a prestressed truss support system until the pipe curtain channel is excavated and communicated;
5) and (5) completing construction of the internal structure of the pipe curtain channel, and dismantling the prestressed truss support system after the design strength is reached.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910732903.1A CN110513122B (en) | 2019-08-09 | 2019-08-09 | Prestressed truss support system and method for pipe curtain construction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910732903.1A CN110513122B (en) | 2019-08-09 | 2019-08-09 | Prestressed truss support system and method for pipe curtain construction |
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| CN110513122A CN110513122A (en) | 2019-11-29 |
| CN110513122B true CN110513122B (en) | 2021-06-25 |
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| CN113279779A (en) * | 2021-05-24 | 2021-08-20 | 苏州大学 | Pipe curtain supporting construction based on prestressing force steel strand wires and annular hasp are connected |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07259108A (en) * | 1994-03-22 | 1995-10-09 | Taisei Corp | Constructing method for underground structure |
| KR200385542Y1 (en) * | 2005-03-07 | 2005-05-31 | 한미기초개발주식회사 | Pipe roof structures |
| CN203834491U (en) * | 2014-04-25 | 2014-09-17 | 中交二航局第四工程有限公司 | Cofferdam for construction of deep ground pit in water slit stratification layer |
| CN105064200A (en) * | 2015-07-29 | 2015-11-18 | 广西交通科学研究院 | Prestressed ferroconcrete combined simply-supported beam bridge with preprocessed assembled fish-bellied truss frame and construction method of prestressed ferroconcrete combined simply-supported beam bridge |
| CN105220697A (en) * | 2015-11-06 | 2016-01-06 | 无锡市大筑岩土技术有限公司 | Shaped steel and prestressed reinforced concrete combining structure support and construction method |
| KR101769255B1 (en) * | 2016-12-15 | 2017-08-24 | 장성호 | Steel Pipe Assembly for Roof Structure |
| JP2017210865A (en) * | 2017-07-31 | 2017-11-30 | 鹿島建設株式会社 | Temporary cut-off method, temporary cut-off structure, supporting, supporting unit |
-
2019
- 2019-08-09 CN CN201910732903.1A patent/CN110513122B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07259108A (en) * | 1994-03-22 | 1995-10-09 | Taisei Corp | Constructing method for underground structure |
| KR200385542Y1 (en) * | 2005-03-07 | 2005-05-31 | 한미기초개발주식회사 | Pipe roof structures |
| CN203834491U (en) * | 2014-04-25 | 2014-09-17 | 中交二航局第四工程有限公司 | Cofferdam for construction of deep ground pit in water slit stratification layer |
| CN105064200A (en) * | 2015-07-29 | 2015-11-18 | 广西交通科学研究院 | Prestressed ferroconcrete combined simply-supported beam bridge with preprocessed assembled fish-bellied truss frame and construction method of prestressed ferroconcrete combined simply-supported beam bridge |
| CN105220697A (en) * | 2015-11-06 | 2016-01-06 | 无锡市大筑岩土技术有限公司 | Shaped steel and prestressed reinforced concrete combining structure support and construction method |
| KR101769255B1 (en) * | 2016-12-15 | 2017-08-24 | 장성호 | Steel Pipe Assembly for Roof Structure |
| JP2017210865A (en) * | 2017-07-31 | 2017-11-30 | 鹿島建設株式会社 | Temporary cut-off method, temporary cut-off structure, supporting, supporting unit |
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