CN104213546B - Wholecircle tunnel cushion block of concrete bar protective layer construction method and topping cushion block thereof - Google Patents
Wholecircle tunnel cushion block of concrete bar protective layer construction method and topping cushion block thereof Download PDFInfo
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- CN104213546B CN104213546B CN201410423026.7A CN201410423026A CN104213546B CN 104213546 B CN104213546 B CN 104213546B CN 201410423026 A CN201410423026 A CN 201410423026A CN 104213546 B CN104213546 B CN 104213546B
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- cushion block
- reinforcing bar
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention provides a kind of wholecircle tunnel cushion block of concrete bar protective layer construction method and topping cushion block thereof, topping cushion block comprises the perpendicular muscle of vertical welding in the middle part of horizontal bar and one end and this horizontal bar, and on the overhanging end of perpendicular muscle, also cover has plastic sheath; In this construction method; the horizontal bar of this topping cushion block is fixed on side by side on the reinforcing bar of outer ring; the perpendicular muscle of this topping cushion block is fixedly connected with inner ring reinforcing bar; the overhanging end of this perpendicular muscle projects into the predetermined length place of the inner side of this inner ring reinforcing bar along normal direction, to ensure that the thickness of concrete cover meets the requirements.When using; because topping cushion block and inner ring reinforcing bar are fixed; behind Form floating extrusion rack top; utilize the main muscle of inner ring to circularize and there is elasticity and the feature that support itself has rigidity moulded by steel; support rack type cushion block moulded by steel can be inconjunction with the displacement that inner ring reinforcing bar outwards does by a small margin (0 ~ 2cm); the problem that Form floating crushes or squeezes inclined cushion block can be solved, effectively ensure that Minimum Concrete Protective Coating Thickness meets design requirement.
Description
Technical field
The present invention relates to a kind of cushion block of concrete bar protective layer structure needing to use in wholecircle tunnel construction.
Background technology
In reinforced concrete member; the too thin easy infiltration wet gas of topping and water in concrete; reinforcing bar ingress of air and oxidizedly cause corrosion; blocked up, easily produce crack; these all may make corrosion of steel bar and expand; thus concrete is wrecked, affect hydraulic tunnel and use and structural safety.Therefore, in current inspection of quality work, the control of protective layer thickness more and more comes into one's own, and new criteria is defined in the course of receiving will carry out entity detection.
For solving the problem, people adopt cushion block structure to carry out the thickness of Control protection layer.Traditional topping cushion block uses cement mortar, makes cushion block at the construction field (site) and insert iron wire in centre to tie up on reinforcing bar.But often there is some problem following in this technique: the cushion block thin and thick 1. made is irregular, can not ensure default thickness of concrete cover in practical operation, time have leakage muscle phenomenon; 2. cement mortar bedding block intensity is low, easily broken, can not ensure protective layer thickness equally.For this reason, people have invented again mortar pad or the plastic cushion of other shapes various or specification.
But, no matter adopt the cushion block of which kind of material and specification, in wholecircle shape primary concreting tunnel, all there is problem.In full circular tunnel, reinforcement cover uses the technical scheme of mortar and plastic cushion, and wholecircle tunnel requires disposablely to complete continuously to build, and the general needle beam trolley that uses is built as template.When steel is installed, wire bundle is tied up in mortar pad utilization and is tied on the main muscle of inner ring, carry out Control protection layer thickness.Due to template during concreting, to be subject to buoyancy excessive, and above-mentioned all cushion blocks all utilize and tie up silk or galvanized wire is fixed on reinforcing bar, touch again cushion block, are easy to be crushed or squeeze partially, topping can be caused not enough, even occur leaking muscle phenomenon after Form floating.
Summary of the invention
For the deficiencies in the prior art; the object of the invention is to: a kind of wholecircle tunnel cushion block of concrete bar protective layer construction method and topping cushion block thereof are provided; solve in wholecircle shape tunnel concrete primary concreting process and easily occur that steel reinforced concrete protective layer is not enough, even occur the problem of the phenomenon of leaking muscle.
For achieving the above object, the technical solution used in the present invention is:
A kind of topping cushion block, for being installed to two lined steel muscle, this two lined steels muscle comprises the coaxial inner ring reinforcing bar that arranges and outer ring reinforcing bar, it is characterized in that: this topping cushion block comprises the perpendicular muscle of vertical welding in the middle part of horizontal bar and one end and this horizontal bar, the overhanging end of perpendicular muscle also overlaps and has plastic sheath; The horizontal bar of this topping cushion block is fixedly connected with this outer ring reinforcing bar, and the perpendicular muscle of this topping cushion block is fixedly connected with this inner ring reinforcing bar, and the overhanging end of this perpendicular muscle projects into the predetermined length place of the inner side of this inner ring reinforcing bar along normal direction.
Described topping cushion block, wherein: fix with outer ring longitudinal rib between this several outer rings reinforcing bar, the horizontal bar colligation of this topping cushion block is fixed on the outer ring longitudinal rib of this outer ring reinforcing bar.
Described topping cushion block, wherein: the overhanging end of this perpendicular muscle is through chamfered.
Described topping cushion block, wherein: this topping cushion block interval is arranged within the scope of the arch 120 degree of two lined steel muscle.
For achieving the above object, the technical solution used in the present invention also comprises:
A construction method for wholecircle tunnel cushion block of concrete bar protective layer, it adopts the topping cushion block according to any one of Claims 1-4, it is characterized in that, comprises the steps:
(1) topping cushion block makes:
One end vertical welding of perpendicular muscle is in the middle part of horizontal bar, and on the overhanging end of perpendicular muscle, cover has plastic sheath;
(2) topping cushion block is installed:
The horizontal bar of topping cushion block and outer ring reinforcing bar binding are fixed, the perpendicular muscle of topping cushion block and this inner ring reinforcing bar binding are fixed, and make the overhanging end of this perpendicular muscle project into the predetermined length place of the inner side of this inner ring reinforcing bar along normal direction.
The construction method of described wholecircle tunnel cushion block of concrete bar protective layer, wherein, also comprises the steps:
(3) trolley formwork is installed;
(4) concreting, by means of the predetermined length of the overhanging end projection of this perpendicular muscle, makes the inner side of two lined steel muscle form one deck concrete cover.
The construction method of described wholecircle tunnel cushion block of concrete bar protective layer, wherein, the circumferential distance+2cm of two adjacent reinforcing bars of horizontal bar length=outer ring reinforcing bar, the radial spacing+default thickness of concrete cover of perpendicular muscle length=inner ring reinforcing bar and outer ring reinforcing bar.
The construction method of described wholecircle tunnel cushion block of concrete bar protective layer, wherein, in step (1), before the overhanging end sleeving plastic cover of perpendicular muscle, uses cast-cutting saw cutting, and end edges is polished chamfering.
Compared with prior art; the beneficial effect that the present invention has is: because " topping cushion block " of the present invention and inner ring reinforcing bar are fixed; behind Form floating extrusion rack top; utilize the main muscle of inner ring to circularize and there is elasticity and the feature that support itself has rigidity moulded by steel; support rack type cushion block moulded by steel can be inconjunction with the displacement that inner ring reinforcing bar outwards does by a small margin (0 ~ 2cm); the problem that Form floating crushes or squeezes inclined cushion block can be solved, effectively ensure that Minimum Concrete Protective Coating Thickness meets design requirement.
Accompanying drawing explanation
Fig. 1 is the axial schematic diagram of mounting structure of wholecircle tunnel cushion block of concrete bar protective layer provided by the invention;
Fig. 2 is the structural representation of topping cushion block provided by the invention;
Fig. 3 is the mounting structure enlarged diagram of wholecircle tunnel cushion block of concrete bar protective layer provided by the invention.
Description of reference numerals: inner ring reinforcing bar 1; Outer ring reinforcing bar 2; Inner ring longitudinal rib 3; Outer ring longitudinal rib 4; Topping cushion block 5; Horizontal bar 6; Perpendicular muscle 7; Plastic sheath 8; Concrete cover A; Predetermined length B.
Detailed description of the invention
First, introduce the existing two lining bar constructions for the formation of wholecircle tunnel, as shown in Figure 1, it comprises inner ring reinforcing bar 1 and the outer ring reinforcing bar 2 of coaxial setting, fix with inner ring longitudinal rib 3 between this inner ring reinforcing bar 1, fix with outer ring longitudinal rib 4 between this outer ring reinforcing bar 2.After building, wish that Concrete Filled is between this inner ring reinforcing bar 1 and outer ring reinforcing bar 2, and form certain thickness concrete cover A again in the inner side of this inner ring reinforcing bar 1.
For this reason, topping cushion block 5 provided by the invention, its structure as shown in Figure 2, comprises the perpendicular muscle 7 of vertical welding in the middle part of horizontal bar 6 and one end and this horizontal bar 6, and on the overhanging end of perpendicular muscle 7, also cover has plastic sheath 8.Under preferable case, the overhanging end of this perpendicular muscle 7 through chamfered, to avoid piercing through this plastic sheath 8, the thickness bottom this plastic sheath 8 also preferably greater than or equal to 2mm, to increase intensity.
When installing; as shown in Figure 1, Figure 3; the horizontal bar 6 fixing (preferred colligation is fixed) of this topping cushion block 5 is on outer ring longitudinal rib 4 and/or this outer ring reinforcing bar 2; the perpendicular muscle 7 of this topping cushion block 5 is fixed with this inner ring reinforcing bar 1 and/or inner ring longitudinal rib 3 colligation, and makes the overhanging end of this perpendicular muscle 7 project into the predetermined length B place, inner side of this inner ring reinforcing bar 1 along normal direction.Like this, when fluid concrete, the distance B that the overhanging end of perpendicular muscle 7 is formed can be relied on, control the thickness of concrete cover A.
Because two lined steel muscle are when concreting, concrete buoyancy is comparatively large, and wayward, chassis mainly easily upwards offsets, and therefore, topping cushion block 5 is mainly arranged within the scope of the arch 120 degree of two lined steel muscle, and the preferred 1.2m of spacing, in quincuncial arrangement.In addition, according to actual requirement, both sides arch also can arrange topping cushion block 5, can effectively avoid chassis lateral shift and affect topping.
Because " topping cushion block 5 " of the present invention and inner ring reinforcing bar are fixed; behind Form floating extrusion rack top; utilize the main muscle of inner ring to circularize and there is elasticity and the feature that support itself has rigidity moulded by steel; support rack type cushion block moulded by steel can be inconjunction with the displacement that inner ring reinforcing bar outwards does by a small margin (0 ~ 2cm); the problem that Form floating crushes or squeezes inclined cushion block can be solved, effectively ensure that the thickness of reinforced concrete protective layer A meets design requirement.
At this, then discuss the construction method of wholecircle tunnel cushion block of concrete bar protective layer 5 provided by the invention in detail, it comprises the steps:
(1) topping cushion block 5 makes:
Use Φ 16 reinforcing bar to be welded into T-shaped according to on-the-spot size, horizontal bar 6 must be vertical with perpendicular muscle 7.Cutting length: the circumferential distance+2cm of two adjacent reinforcing bars of horizontal bar 6 length=outer ring reinforcing bar 2, the radial spacing+default concrete cover A thickness of perpendicular muscle 7 length=inner ring reinforcing bar 1 and outer ring reinforcing bar 2; Plastic sheath 8 adopts nonpoisonous plastic material, and top thickness is 2mm.
Before perpendicular muscle 7 termination point casing plastic sheath 8, cast-cutting saw must be used to cut, and end edges is polished the chamfering of 3mm, be beneficial to better contact with plastic sheath 8, avoid plastic sheath 8 stressed excessive and be pierced.After having welded, plastic sheath 8 on perpendicular muscle 7 termination point casing.
(2) topping cushion block 5 is installed:
The horizontal bar 6 of topping cushion block 5 is fixed with outer ring longitudinal rib 4 and/or this outer ring reinforcing bar 2 colligation; the perpendicular muscle 7 of topping cushion block 5 is fixed with this inner ring reinforcing bar 1 and/or inner ring longitudinal rib 3 colligation, and makes the overhanging end of this perpendicular muscle 7 project into the inner side of this inner ring reinforcing bar 1 along normal direction.
(3) trolley formwork is installed:
Two lined steel muscle and steel mould support rack type cushion block install fixing after, carry out trolley formwork installation.According to survey crew unwrapping wire, professional operator chassis is put in storage in place, reinforce, according to chassis designing and calculating scheme, take enough measure of anti float.
(4) concreting:
After formwork jumbo installation, full circle once completes builds shaping, makes the inner side of two lined steel muscle form the suitable concrete cover A of a layer thickness.
Topping cushion block 5 provided by the invention; make relative ease; fraction is higher; the good various rough sledding adapted in needle beam trolley template primary concreting process; thus overcome phenomenons such as " chop prints " preferably; avoid the problem occurring concrete cover A uneven distribution, ensure that workmanship.
Claims (8)
1. a topping cushion block, for being installed to two lined steel muscle, this two lined steels muscle comprises the coaxial inner ring reinforcing bar that arranges and outer ring reinforcing bar, it is characterized in that: this topping cushion block comprises the perpendicular muscle of vertical welding in the middle part of horizontal bar and one end and this horizontal bar, the overhanging end of perpendicular muscle also overlaps and has plastic sheath; The horizontal bar of this topping cushion block is fixedly connected with this outer ring reinforcing bar, and the perpendicular muscle of this topping cushion block is fixedly connected with this inner ring reinforcing bar, and the overhanging end of this perpendicular muscle projects into the predetermined length place of the inner side of this inner ring reinforcing bar along normal direction.
2. topping cushion block according to claim 1, is characterized in that: fix with outer ring longitudinal rib between the reinforcing bar of several outer rings, and the horizontal bar colligation of this topping cushion block is fixed on the outer ring longitudinal rib of this outer ring reinforcing bar.
3. topping cushion block according to claim 1, is characterized in that: the overhanging end of this perpendicular muscle is through chamfered.
4. topping cushion block according to claim 1, is characterized in that: this topping cushion block interval is arranged within the scope of the arch 120 degree of two lined steel muscle.
5. a construction method for wholecircle tunnel cushion block of concrete bar protective layer, it adopts the topping cushion block according to any one of Claims 1-4, it is characterized in that, comprises the steps:
(1) topping cushion block makes:
One end vertical welding of perpendicular muscle is in the middle part of horizontal bar, and on the overhanging end of perpendicular muscle, cover has plastic sheath;
(2) topping cushion block is installed:
The horizontal bar of topping cushion block and outer ring reinforcing bar binding are fixed, the perpendicular muscle of topping cushion block and this inner ring reinforcing bar binding are fixed, and make the overhanging end of this perpendicular muscle project into the predetermined length place of the inner side of this inner ring reinforcing bar along normal direction.
6. the construction method of wholecircle tunnel cushion block of concrete bar protective layer according to claim 5, is characterized in that, also comprise the steps:
(3) trolley formwork is installed;
(4) concreting, by means of the predetermined length of the overhanging end projection of this perpendicular muscle, makes the inner side of two lined steel muscle form one deck concrete cover.
7. the construction method of wholecircle tunnel cushion block of concrete bar protective layer according to claim 5; it is characterized in that; circumferential distance+the 2cm of two adjacent reinforcing bars of horizontal bar length=outer ring reinforcing bar, the radial spacing+default thickness of concrete cover of perpendicular muscle length=inner ring reinforcing bar and outer ring reinforcing bar.
8. the construction method of wholecircle tunnel cushion block of concrete bar protective layer according to claim 5, is characterized in that, in step (1), before the overhanging end sleeving plastic cover of perpendicular muscle, uses cast-cutting saw cutting, and end edges is polished chamfering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410423026.7A CN104213546B (en) | 2014-08-25 | 2014-08-25 | Wholecircle tunnel cushion block of concrete bar protective layer construction method and topping cushion block thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410423026.7A CN104213546B (en) | 2014-08-25 | 2014-08-25 | Wholecircle tunnel cushion block of concrete bar protective layer construction method and topping cushion block thereof |
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| Publication Number | Publication Date |
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| CN104213546A CN104213546A (en) | 2014-12-17 |
| CN104213546B true CN104213546B (en) | 2016-01-20 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105971639B (en) * | 2016-06-24 | 2018-08-28 | 中铁第四勘察设计院集团有限公司 | A kind of extension tunnel reinforced concrete lining cutting service life structures and methods |
| CN108756949B (en) * | 2018-06-26 | 2024-03-29 | 中铁五局集团贵州工程有限公司 | Positioning device for spacing and protective layer of two lining reinforced layers of tunnel |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10159180A (en) * | 1996-11-27 | 1998-06-16 | Fujita Corp | Construction method of concrete structure using membranous body |
| CN201738935U (en) * | 2010-09-03 | 2011-02-09 | 中国水利水电第七工程局有限公司 | Chamber arch jet molding concrete construction structure |
| CN202611719U (en) * | 2012-05-24 | 2012-12-19 | 中铁十二局集团第三工程有限公司 | Device for controlling thickness of tunnel secondary lining steel bar protection layer |
| CN203271768U (en) * | 2013-05-23 | 2013-11-06 | 西南交通大学 | Secondary shield tunnel lining and pouring device |
| CN203783599U (en) * | 2014-03-31 | 2014-08-20 | 中铁第一勘察设计院集团有限公司 | Anti-cracking reinforcing mesh for tunnel lining |
| CN204023528U (en) * | 2014-08-25 | 2014-12-17 | 北京翔鲲水务建设有限公司 | Topping cushion block |
-
2014
- 2014-08-25 CN CN201410423026.7A patent/CN104213546B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10159180A (en) * | 1996-11-27 | 1998-06-16 | Fujita Corp | Construction method of concrete structure using membranous body |
| CN201738935U (en) * | 2010-09-03 | 2011-02-09 | 中国水利水电第七工程局有限公司 | Chamber arch jet molding concrete construction structure |
| CN202611719U (en) * | 2012-05-24 | 2012-12-19 | 中铁十二局集团第三工程有限公司 | Device for controlling thickness of tunnel secondary lining steel bar protection layer |
| CN203271768U (en) * | 2013-05-23 | 2013-11-06 | 西南交通大学 | Secondary shield tunnel lining and pouring device |
| CN203783599U (en) * | 2014-03-31 | 2014-08-20 | 中铁第一勘察设计院集团有限公司 | Anti-cracking reinforcing mesh for tunnel lining |
| CN204023528U (en) * | 2014-08-25 | 2014-12-17 | 北京翔鲲水务建设有限公司 | Topping cushion block |
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| CN104213546A (en) | 2014-12-17 |
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Address after: 100192 Qinghe Road, Haidian District, Beijing 191 Patentee after: Beijing Xiangkun Water Conservancy Project Co., Ltd. Address before: 100192 Beijing Haidian District Henan town north riverside East Road Patentee before: Beijing Xiangkun Water Conservancy Project Co., Ltd. |
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