CN102653958A - Inner tensioning pre-stressed concrete double-layer I-shaped framework box-type structure - Google Patents

Abstract

Translated fromChinese

一种建筑物的内张拉预应力混凝土双层I型框架箱形结构，在断面方向设置框架，形成双层箱形断面，外围框架梁截面为I型，跨度范围在7～36米，在外围框架中设置环形预应力筋，在中间层框架梁中设置抛物线预应力筋，将张拉槽预留在结构内部的梁腹板侧面，当混凝土达到规定强度后，在张拉槽处通过中间锚具将同一预应力筋的各段首尾顺序连接并张拉，然后封堵张拉槽，其特征是：张拉槽预留在I型框架梁截面内，通过中间锚具连接并张拉预应力筋。本发明的有益效果是，当结构构件端部不具备张拉锚固条件时，能够实现预应力张拉连接，可提供较好的舒适度、使用性能和结构性能，特别适用于地下重载、大跨双层框架箱形结构。

A kind of internal tension prestressed concrete double-layer I-shaped frame box structure of a building, a frame is arranged in the section direction to form a double-layer box-shaped section, the outer frame beam section is I-shaped, and the span range is 7 to 36 meters. Ring prestressed tendons are set in the peripheral frame, parabolic prestressed tendons are set in the frame beam of the middle layer, and the tension groove is reserved on the side of the beam web inside the structure. When the concrete reaches the specified strength, it passes through the middle layer at the tension groove The anchorage connects and tensions each section of the same prestressed tendon in sequence, and then seals the stretching groove. Stress tendon. The beneficial effect of the present invention is that when the end of the structural member does not have tension anchoring conditions, it can realize prestressed tension connection, which can provide better comfort, use performance and structural performance, and is especially suitable for underground heavy-duty, large-scale Span double frame box structure.

Description

Inner stretch-draw prestressing force concrete double I type framework box structure

Affiliated technical field

The present invention relates to a kind of double-deck I type of post-tensioned prestressed concrete framework box structure of building; Especially when not possessing tension of prestressed tendon, anchoring condition, at the double-deck I type of the post-tensioned prestressed concrete framework box structure of the connection of the concrete frame web side of inside configuration, tensioned prestressing bar in frame ends.

Background technology

At present, the double-deck I type of known post-tensioned prestressed concrete framework box structure is sleeve pipe, distributing bar and the part of settling post-tensioned prestressing muscle pore-forming earlier, mounting template and concreting then.Presstressed reinforcing steel can also can be worn later on by first threading.After reaching intensity Deng concrete, with jack with tension of prestressed tendon to the stress that requires and anchor in the two ends of beam, compressive pre-stress is passed to concrete members through the two ends ground tackle.In order to protect presstressed reinforcing steel not corroded and to recover the adhesion stress between presstressed reinforcing steel and the concrete, the space between presstressed reinforcing steel and the sleeve pipe must irritate real with cement paste.Cement paste also helps recovering the adhesion stress between presstressed reinforcing steel and the concrete except that playing antisepsis.Construction for ease, the no bonded post tensioning prestressing force that also can be employed in presstressed reinforcing steel external coating anti-corrosion material sometimes and wrap up with plastic bushing or oilpaper.But, at the two ends of underground structure member, need reserve the stretch-draw groove because of stretch-draw prestressing force usually, cause increasing construction costs, prolong the construction period, concerning some engineerings, it is unacceptable prolonging the construction period.Disclosed on the 11st page of " Guangdong building and building " o. 11th of publishing in November, 2,002 one undergroundly stride greatly, heavy structure; This article compares prestressing force and two kinds of schemes of ordinary concrete structure; And point out: prestressed structure can further reduce the steel concrete consumption of subway station; Reduce beam/plate height, so that the station buried depth is less; Station top board span centre maximum distortion is less, and crack resistance is also better; But consider the employing prestressed Construction Technology, construction technology is comparatively complicated, and difficulty of construction is bigger, therefore Ying Shenyong in the construction of underground station at present.The ordinary concrete structural concept has finally been selected in this design for use.Compare with prestressed structure, this ordinary concrete malformation is big, cracking resistance is relatively poor, endurance quality is bad, economy is general, limited stride greatly, the further application of heavy structure.

Summary of the invention

In order to overcome the double-deck I type of existing post-tensioned prestressed concrete framework box structure requires to reserve the stretch-draw anchor condition in its end deficiency; The present invention provides a kind of inner stretch-draw prestressing force concrete double I type framework box structure; This bilayer I type framework box structure no longer requires must reserve the stretch-draw anchor condition at component ends; But can reserve the stretch-draw groove at the frame facet of inside configuration; Through connection, the stretch-draw of middle ground tackle completion presstressed reinforcing steel, this bilayer I type framework box-shaped construction pre-stress stretching technology is comparatively simple, structural performance is better, difficulty of construction is less, the duration is relatively short, cost is constant basically in the stretch-draw groove.

Technical scheme of the present invention is:

A kind of inner stretch-draw prestressing force concrete double I type framework box structure of building is provided with frame construction in parallel its section direction, forms double-deck box section; The Vierendeel girder cross section is the I type; Vierendeel girder span-depth radio scope is provided with annular prestressed muscle at 7～36 meters in frame column, back timber and bottom girder, at the framework central sill positive and negative parabola presstressed reinforcing steel is set; The stretch-draw groove is reserved in the Vierendeel girder web side of stressed less, the easy construction of inside configuration; When placing of concrete and after reaching prescribed strength, be linked in sequence through each section head and the tail of middle ground tackle at stretch-draw groove place same presstressed reinforcing steel bundle, the arbitrary stretch-draw end at middle ground tackle carries out stretch-draw then; After stretch-draw finishes on request shutoff stretch-draw groove get final product; It is characterized in that: the stretch-draw groove is reserved in the framework web side of stressed less, the easy construction of inside configuration, in I type Vierendeel girder cross section, connects and tensioned prestressing bar through middle ground tackle.

Characteristic of the present invention also is: the structure cross section is double-deck box-formed shape, and the Vierendeel girder span L is not less than 7 meters, and Vierendeel girder is I type cross section, and frame spacing is not more than L/3.

Characteristic of the present invention also is: presstressed reinforcing steel is similar with traditional prestressed frame beam arrangement of reinforcement in the Vierendeel girder; Be positive and negative parabolic distribution; The inflection point position is generally 0.08L～0.12L, and the presstressed reinforcing steel that is arranged on frame column, framework back timber and bottom girder forms a loop curve, and the framework central sill uses positive and negative parabola presstressed reinforcing steel; The prestressing tendon profile is consistent with bending moment diagram as far as possible, arranges near the tight side edge as far as possible.

Characteristic of the present invention also is: the bundle shape of presstressed reinforcing steel can be a closed curve, also can be non-closed curve; If closed curve, no anchored end; If be non-closed curve, its end is an anchored end.

Characteristic of the present invention also is: in same Pin prestressed frame, and the radical of every bundle presstressed reinforcing steel and prestressing tendon number, according to the design demand setting, presstressed reinforcing steel is arranged about the vertical axis of symmetry symmetry of framework.

Characteristic of the present invention also is: the stretch-draw groove is reserved in the position of stressed less, easy construction, near the natural axis like Vierendeel girder three branches; The spacing of same prestressing tendon preformed groove and middle ground tackle, according to the design demand setting, its scope is 15～50 meters.

Characteristic of the present invention also is: if possess the stretch-draw space, carry out stretch-draw at middle ground tackle near an inside configuration or an outside end.

Characteristic of the present invention also is: if possess the stretch-draw anchor condition, the stretch-draw groove is reserved in inside configuration or outside frame ends and side.

The invention has the beneficial effects as follows, when double-deck I type framework box-shaped structural element end does not possess the stretch-draw anchor condition, can realize prestressed stretch-draw, anchoring; Be specially adapted to underground heavy duty, stride concrete double I type framework box structure greatly, comfort level and functional performance preferably can be provided, can reduce floor space; The prestressing force drawing process is comparatively simple, and structural performance is better, and difficulty of construction is less; Duration is shorter relatively, and cost is constant basically.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is further specified.

Fig. 1 is a top board structure layout plan of the present invention.

Fig. 2 is of thepresent invention 1^#, 2^#Prestressing tendon section arrangement diagram.

Fig. 3 is of thepresent invention 3^#, 4^#Prestressing tendon section arrangement diagram.

Fig. 4 is the 1-1 sectional drawing of Fig. 2.

Fig. 5 is the 1-1 sectional drawing of Fig. 3.

Among the figure 1.1^#The loop curve prestressing tendon, 2.2^#The loop curve prestressing tendon, 3.3^#The loop curve prestressing tendon, 4.4^#The loop curve prestressing tendon, 5.1^#, 3^#The reservation stretch-draw groove of prestressing tendon, 6.2^#, 4^#The reservation stretch-draw groove of prestressing tendon, 7. inside configuration space, 8. structural outer; 9. framework back timber/bottom girder, 10. in the middle of the ground tackle end that deviates from inside configuration, the inner end of ground tackle direction structures in the middle of 11.; 12. middle ground tackle (title encircles anchor again, anchor moves about), 13. frame columns, 14. positive and negative parabolas 1^#Prestressing tendon, 15. positive and negative parabolas 1^#The reservation stretch-draw groove of prestressing tendon, 16. framework central sills, the anchored end of 17. positive and negative parabola prestressing tendons, 18. positive andnegative parabolas 2^#Prestressing tendon, 19. positive andnegative parabolas 2^#The reservation stretch-draw groove of prestressing tendon.

The specific embodiment

In Fig. 1,2,4,1^#Loop curve prestressing tendon (1) is a plane closed curve, is made up oflay 18 prestress wires^#Loop curve prestressing tendon (1) is with 1^#The stretch-draw groove (5) of loop curve prestressing tendon (1) is reserved in a near side of the natural axis of framework back timber/bottom girder (9) three branches, when placing of concrete and after reaching prescribed strength, passes through middle ground tackle (12) with 1 at stretch-draw groove place (5)^#Each section head and the tail of loop curve prestressing tendon (1) are linked in sequence, and the arbitrary stretch-draw end (10,11) at middle ground tackle carries out stretch-draw then, after stretch-draw finishes on request shutoff stretch-draw groove (5) get final product.2^#Loop curve prestressing tendon (2), positive and negative parabola 1^#The embodiment of prestressing tendon is basic with 1^#Loop curve prestressing tendon (1).

In Fig. 1,3,5,3^#Loop curve prestressing tendon (3) is a plane closed curve, is made up of lay 38 prestress wires^#Loop curve prestressing tendon (3) is with 3^#The stretch-draw groove (6) of loop curve prestressing tendon (3) is reserved in a near side of the natural axis of framework back timber/bottom girder (9) three branches, 1^#, 3^#The stretch-draw groove (5) and 2 of loop curve prestressing tendon^#, 4^#The stretch-draw groove (6) of loop curve prestressing tendon is arranged about the vertical plane of symmetry antisymmetry of framework, when placing of concrete and after reaching prescribed strength, passes through middle ground tackle (12) with 3 at stretch-draw groove place (6)^#Each section head and the tail of loop curve prestressing tendon (3) are linked in sequence, and the arbitrary stretch-draw end (10,11) at middle ground tackle carries out stretch-draw then, after stretch-draw finishes on request shutoff stretch-draw groove (6) get final product 3^#Loop curve prestressing tendon (3) is a plane closed curve.4^#Loop curve prestressing tendon (4), positive andnegative parabola 2^#The embodiment of prestressing tendon is basic with 3^#Loop curve prestressing tendon (3).

Claims (9)

1. the inner stretch-draw prestressing force concrete double I type framework box structure of a building is provided with frame construction in parallel its section direction, forms double-deck box section; The Vierendeel girder cross section is the I type; Vierendeel girder span-depth radio scope is provided with annular prestressed muscle at 7～36 meters in frame column, back timber and bottom girder, at the framework central sill positive and negative parabola presstressed reinforcing steel is set; The stretch-draw groove is reserved in the Vierendeel girder web side of stressed less, the easy construction of inside configuration; When placing of concrete and after reaching prescribed strength, be linked in sequence through each section head and the tail of middle ground tackle at stretch-draw groove place same presstressed reinforcing steel bundle, the arbitrary stretch-draw end at middle ground tackle carries out stretch-draw then; After stretch-draw finishes on request shutoff stretch-draw groove get final product; It is characterized in that: the stretch-draw groove is reserved in the framework web side of stressed less, the easy construction of inside configuration, in I type Vierendeel girder cross section, connects and tensioned prestressing bar through middle ground tackle.

2. inner stretch-draw prestressing force concrete double I type framework box structure according to claim 1, it is characterized in that: the structure cross section is double-deck box-formed shape, and the Vierendeel girder span L is not less than 7 meters, and Vierendeel girder is I type cross section, and frame spacing is not more than L/3.

3. inner stretch-draw prestressing force concrete double I type framework box structure according to claim 1; It is characterized in that: presstressed reinforcing steel is similar with traditional prestressed frame beam arrangement of reinforcement in the Vierendeel girder, is positive and negative parabolic distribution, and the inflection point position is generally 0.08L～0.12L; The presstressed reinforcing steel that is arranged on frame column, framework back timber and bottom girder forms a loop curve; The framework central sill uses positive and negative parabola presstressed reinforcing steel, and the prestressing tendon profile is consistent with bending moment diagram as far as possible, arranges near the tight side edge as far as possible.

4. inner stretch-draw prestressing force concrete double I type framework box structure according to claim 1, it is characterized in that: the bundle shape of presstressed reinforcing steel can be a closed curve, also can be non-closed curve; If closed curve, no anchored end; If be non-closed curve, its end is an anchored end.

5. inner stretch-draw prestressing force concrete double I type framework box structure according to claim 1; It is characterized in that: in same Pin prestressed frame; The radical of every bundle presstressed reinforcing steel and prestressing tendon number, according to the design demand setting, presstressed reinforcing steel is arranged about the vertical axis of symmetry symmetry of framework.

6. inner stretch-draw prestressing force concrete double I type framework box structure according to claim 1 is characterized in that: the stretch-draw groove is reserved in the position of stressed less, easy construction, near the natural axis like Vierendeel girder three branches; The spacing of same prestressing tendon preformed groove and middle ground tackle, according to the design demand setting, its scope is 15～50 meters.

7. inner stretch-draw prestressing force concrete double I type framework box structure according to claim 1 is characterized in that: if possess the stretch-draw space, carry out stretch-draw at middle ground tackle near an inside configuration or an outside end.

8. inner stretch-draw prestressing force concrete double I type framework box structure according to claim 1 is characterized in that: if possess the stretch-draw anchor condition, the stretch-draw groove is reserved in inside configuration or outside frame ends and side.

9. the job practices of inner stretch-draw prestressing force concrete double I type framework box structure according to claim 1, its step is:

A) each prestressing tendon of lay (1,2,3,4,14,18);

B) the stretch-draw groove (5,6,15,19) of each prestressing tendon is reserved in the side of the stressed less and easy construction of structural inner frame back timber/bottom girder (9);

C) when placing of concrete and after reaching prescribed strength, the stretch-draw groove (5,6,15,19) in I type framework cross section is located, and is linked in sequence through each section head and the tail of middle ground tackle (12) with same presstressed reinforcing steel bundle;

D) the arbitrary stretch-draw end (10,11) at middle ground tackle carries out stretch-draw, after stretch-draw finishes on request shutoff stretch-draw groove (5,6,15,19) get final product;

E) when the multi beam presstressed reinforcing steel is set in concrete structure, each Shu Zhangla groove is about the structure section symmetric arrangement, all the other steps are same a), b), c), d).

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