CN105625185A

CN105625185A - Skewback construction method for tied arch bridge

Info

Publication number: CN105625185A
Application number: CN201510962459.4A
Authority: CN
Inventors: 蓝清; 王文强; 王静霞; 马明生; 孙竹立; 赵红军; 凌志泉
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-12-22
Filing date: 2015-12-22
Publication date: 2016-06-01
Anticipated expiration: 2035-12-22
Also published as: CN105625185B

Abstract

The invention relates to a skewback construction method for a tied arch bridge. The skewback construction method comprises the following steps: step one, positioning steel plates formed with through holes are arranging on the two sides of a skewback of an arch rib respectively to form a skewback space; step two, reinforcing meshes are arranged in the space, are fixedly connected with the skewback and the locating steel plates and deviate from the through holes formed in the positioning steel plates; step three, a template is arranged on the outer side of the locating steel plates, and vibrating holes, corresponding to the through holes, are formed in the template; step four, a vibrating head of a vibrating rod is inserted into the space through the vibrating holes and the through holes, then concrete is poured into the space, and the vibrating head vibrates the concrete in the space; and step five, after vibration is finished, the vibrating head is left in the space. According to the skewback construction method of the invention, the compactness of the concrete at the connecting part of the skewback of the arch rib and the bridge deck can be greatly improved, and thus connection of the skewback and the bridge deck is more solid.

Description

The arch springing construction method of bowstring arch bridge

Technical field

The present invention relates to method for bridge construction, particularly to the arch springing construction method of bowstring arch bridge.

Background technology

Bowstring arch bridge is the one of arch bridge, compared with common bridge, and the good looking appearance of bowstring arch bridge, cost is relatively low, and the height of bowstring arch bridge can across about the 1/50 of footpath, and satisfied navigation requires under premise, floor elevation can be reduced to greatest extent, shorten access bridge length, save construction costs.

Similarly, bowstring arch bridge includes bridge floor and is in the arch above bridge floor. The two ends of arch are then by together with armored concrete is permanently connected with bridge floor, thus realizing encircleing and the common bearing load of bridge floor. But, together with how arch being stably attached to bridge floor, for bowstring arch bridge it is critical that.

Summary of the invention

For the problems referred to above, the present invention proposes the arch springing construction method of a kind of bowstring arch bridge. The method according to the invention, it is possible to by the concrete degree of compaction of the arch springing Yu bridge floor connection that are greatly improved arch rib, so that arch is more solid with the connection of bridge floor.

The arch springing construction method of the bowstring arch bridge of the present invention comprises the following steps: step one, is respectively provided with the fixing steel plate with through hole in the both sides of the arch springing of arch rib to form the space clamping arch springing; Step 2, arranges bar-mat reinforcement in space, and bar-mat reinforcement is fixedly linked with arch springing and fixing steel plate, and deviates the through hole on fixing steel plate; Step 3, in the arranged outside template of fixing steel plate, template is configured with the vibrate hole corresponding with through hole; Step 4, by vibrating hole and the vibrator of vibrating spear is inserted in space by through hole, then injects concrete in space, and the concrete in space is vibrated by vibrator; Step 5, end of vibrating, vibrator is stayed in space.

The method according to the invention, by arranging through hole on fixing steel plate, and arranges hole of vibrating, it is possible to be inserted near arch springing through bar-mat reinforcement by the vibrator of vibrating spear in template. So, when injecting concrete, it is possible to the concrete around arch springing is vibrated, closely knit. In addition, vibrate after terminating, vibrator can be stayed in the space accommodating arch springing by cutting off the sebific duct of vibrating spear, so can not only can avoid take out vibrator faced by difficulty, and can avoid causing the concrete around arch springing again to be redistributed because taking out vibrator, and then the problem destroying concrete density. Thus, the method according to the invention, even if arch springing place has intensive bar-mat reinforcement, it is also possible to the concrete at closely knit arch springing place well, thus substantially increases the robustness of arch and the connection of bridge floor.

In one embodiment, each template is provided with multiple through hole, and the quantity of the through hole of the central region of template is more than the quantity of the through hole of lower area. Applicant has been surprisingly found that, the lowest point of vibrated concrete, the stone of bottom can not be made to increase, thus concrete compaction rate can not be improved on the whole. But, vibrate at concrete middle part, stone being made to be evenly distributed in concrete rather than be deposited to concrete bottom, thus can improve concrete compaction rate on the whole, this is extremely important with the robustness of the connection of bridge floor for improving arch.

In one embodiment, in step one, bridge floor arranges support member, and the arch springing of arch rib is supported on support member. By arranging support member, in work progress, can prevent arch springing from destroying bridge floor. In one embodiment, in step 2, the bar-mat reinforcement in space includes the bar-mat reinforcement of the bar-mat reinforcement of level, vertical bar-mat reinforcement and inclination. Bar-mat reinforcement can by support member, arch rib includes arch springing and fixing steel plate is stably attached to together. As such, it is possible to prevent in the process of injection concrete and vibrated concrete, support member, arch rib include arch springing and fixing steel plate scatters, and cause and construct unsuccessfully.

In one embodiment, in step 4, vibrator is set in a horizontal manner. This way it is possible to avoid the length that the sebific duct of vibrating spear is in concrete. Thus, the length finally staying sebific duct in concrete is also the shortest, and this also contributes to the robustness improving arch with the connection of bridge floor.

In one embodiment, in step 4, in space, successively inject concrete, after handled concrete layer is closely knit, inject next layer concrete. In another embodiment, in step 4, it is located on bar-mat reinforcement makes it that concrete within the scope of reservation to be vibrated by vibrator is tied up. The concrete of equivalent layer can be carried out closely knit by the vibrator of this set and construction in layer efficiently, thus improving efficiency of construction and construction quality.

In one embodiment, after handled concrete layer is closely knit, before injecting next layer concrete, vibrator is stayed in concrete and is used the hole of vibrating accordingly on perforations adding plate stopend. In one embodiment, being shaped as of hole of vibrating is gradually reduced along towards the orient diameter in this space, the mating shapes in the shape of perforations adding plate and hole of vibrating. So, when installing perforations adding plate, perforations adding plate can be imposed severe pressure without worrying that perforations adding plate can pass hole of vibrating and enter into concrete inside, thus can farthest reducing the gap between perforations adding plate and template, this is extremely important for the concrete surface aesthetics after raising molding.

In one embodiment, with the method for many places means of spot welds, perforations adding plate and template are welded together. So, after installing perforations adding plate, it is possible to prevent perforations adding plate from deforming, this also contributes to the concrete surface aesthetics after improving molding.

Compared with prior art, it is an advantage of the current invention that: (1) by arranging through hole on fixing steel plate, and arranges hole of vibrating in template, it is possible to is inserted near arch springing through bar-mat reinforcement by the vibrator of vibrating spear. So, when injecting concrete, it is possible to the concrete around arch springing is vibrated, closely knit. (2) vibrate end after, vibrator can be stayed in the space accommodating arch springing by cutting off the sebific duct of vibrating spear, so can not only can avoid take out vibrator faced by difficulty, and can avoid causing the concrete around arch springing again to be redistributed because taking out vibrator, and then the problem destroying concrete density.

Accompanying drawing explanation

Based on embodiment reference accompanying drawing, the present invention will be described in more detail hereinafter. Wherein:

Fig. 1 is the reality position of the arch springing of embodiment of the method according to the invention, support member and fixing steel plate schematically.

The state being provided with bar-mat reinforcement of the embodiment of the method according to the invention that Fig. 2 is schematically real.

The state being provided with template of the embodiment of the method according to the invention that Fig. 3 is schematically real.

The structure of the template of the embodiment of the method according to the invention that Fig. 4 is schematically real.

The structure of the perforations adding plate of the embodiment of the method according to the invention that Fig. 5 is schematically real.

In the accompanying drawings, identical parts use identical accompanying drawing labelling. Accompanying drawing is not according to actual ratio.

Detailed description of the invention

Below in conjunction with accompanying drawing, the invention will be further described.

When the method according to the invention is constructed, first have to be arranged on the arch springing 2 of arch rib 1 the predetermined position of bridge floor 3. Preferably, as it is shown in figure 1, support member 4 can be pre-set in this pre-position, then again arch springing 2 is supported on the support 4. Support member 4 can avoid arch springing 2 to destroy bridge floor 3. Support member 4 such as can be made up of steel plate. It follows that be respectively provided with fixing steel plate 5 (being diagrammatically only by row ground reality one piece in Fig. 1) in the both sides of arch springing 2. The space 7 clamping arch springing 2 is defined between two pieces of fixing steel plates 5. It should be understood that support member 4 is also in this space. Being configured with multiple through hole 6 on fixing steel plate 5, these through holes 6 are used for arranging vibrating spear 33, and this will be described below.

After setting up support member 4, arch springing 2 and fixing steel plate 5, substantial amounts of bar-mat reinforcement 21 is set in space 7, and bar-mat reinforcement 21 is fixedly connected together with support member 4, arch springing 2 and fixing steel plate 5, as shown in Figure 2. So, support member 4, arch springing 2 and fixing steel plate 5 are the formation of an entirety with bar-mat reinforcement 21. Bar-mat reinforcement 21 can include the bar-mat reinforcement of level, vertical bar-mat reinforcement 212 and the bar-mat reinforcement 213 tilted. It should be noted that the setting of bar-mat reinforcement 21 should avoid the through hole 6 on fixing steel plate 5.

It follows that in the arranged outside template 31 of fixing steel plate 5, as shown in Figure 3. Template 31 is configured with the vibrate hole 41 corresponding with through hole 6. Hole 41 of vibrating is equally applicable to arrange vibrating spear 33, and this will be described below. When arranging template 31, it shall be noted that align with through hole 6 in the hole 41 that makes to vibrate. Fig. 4 shows the structure of template 31, and in Fig. 4, dotted line represents bar-mat reinforcement 21 and other structure as described above, repeats no more here.

Next, by vibrating hole 41 and the vibrator of vibrating spear 33 is inserted in space 7 from outside by through hole 2, in space 7, concrete is then injected. Start vibrating spear 33, so that the concrete in space 7 to be vibrated. After reaching concrete predetermined degree of compaction, stop vibrating spear 33, end of vibrating. Cut off the sebific duct of vibrating spear 33, to be stayed in space 7 by vibrator.

Vibrate hole 41 and through hole 2 is also used as observation port and feed supplement hole. When the concrete in space 7 is somewhat not enough, it is possible to by vibrating hole 41 and through hole 2 fills into concrete easily.

In order to further the concrete in space 7 be carried out closely knit, each template 31 be provided with multiple hole 41 of vibrating, and the quantity of the through hole of the central region 51 of template 31 is more than the quantity of the through hole of lower area 52. Even, it is possible to through hole is not set in lower area 52. It has been found that when the concrete in middle level is vibrated, it is possible to avoid the stone in concrete to sink to bottom, but middle level can be remained essentially in until concrete setting. Therefore more hole 41 of vibrating is set in the central region 51 of template 31 and can more effectively on the whole concrete be carried out closely knit. It should be understood that the quantity of the through hole of the central region of fixing steel plate 5 quantity also greater than the through hole of lower area.

It is highly preferred that arrange vibrator in a horizontal manner, namely in the horizontal direction vibrator is inserted through through hole 6 and hole 41 of vibrating. Compared with arranging vibrator with other modes, horizontal mode arranges vibrator and makes the length that the sebific duct of vibrator enters in concrete shorter. After cutting off sebific duct, along with vibrator, to stay the length of the sebific duct in concrete just shorter, and this also contributes to improve concrete degree of compaction.

Concrete can be successively injected in space 7 in successively mode. It is located on bar-mat reinforcement makes it that concrete within the scope of reservation to be vibrated in such a case, it is possible to vibrator is tied up. For example, according to designing in advance, vibrator is fixed on precalculated position. When injecting concrete, inject the concrete of respective amount only for each fixed position. Thus, the concrete of each layer can vibrate by vibrator, closely knit, thus can improve concrete degree of compaction on the whole further. Additionally, only after the concrete compaction in lower floor precalculated position, then in adjacent upper precalculated position, inject concrete. It it should be understood that, " after the concrete compaction in lower floor precalculated position; inject concrete in adjacent upper precalculated position " mentioned here refers to that the concrete density in lower floor precalculated position reaches requirement and before the hardening, just injection concrete in adjacent upper precalculated position. The determination mode of concrete degree of compaction is known by those skilled in the art, repeats no more here.

After handled concrete layer is closely knit, before injecting next layer concrete, it is necessary to vibrator is stayed in space and used the hole 41 of vibrating accordingly on perforations adding plate 53 stopend 31. Preferably, the truncated cone-shaped that is shaped as in hole 41 of vibrating, the mating shapes (as shown in Figure 5) in the shape of perforations adding plate 53 and hole 41 of vibrating. During using template 31, the small end in hole 41 of vibrating is towards space 7. As such, it is possible to apply bigger power to perforations adding plate 53 to block hole 41 of vibrating, without worrying that perforations adding plate 53 enters into concrete inside through template 31. Gap between perforations adding plate 53 and template 31 also can be reduced, and this is extremely important for the concrete surface aesthetics after raising molding. Additionally, also perforations adding plate 53 and template 31 are welded together with the method for many places means of spot welds. So being possible to prevent perforations adding plate 31 to deform, this also contributes to the concrete surface aesthetics after improving molding.

Although by reference to preferred embodiment, invention has been described, but without departing from the scope of the invention, it is possible to it is carried out various improvement and parts therein or parts can be replaced with equivalent. Especially, as long as the conflict of the structure of being absent from and step, the every technical characteristic being previously mentioned in each embodiment all can combine in any way. The invention is not limited in the specific embodiment disclosed in literary composition, but include all technical schemes falling in scope of the claims.

Claims

1. the arch springing construction method of bowstring arch bridge, comprises the following steps:

Step one, is respectively provided with the fixing steel plate with through hole to form the space clamping described arch springing in the both sides of the arch springing of arch rib;

Step 2, arranges bar-mat reinforcement in described space, and described bar-mat reinforcement is fixedly linked with arch springing and fixing steel plate, and deviates the through hole on described fixing steel plate;

Step 3, in the arranged outside template of described fixing steel plate, described template is configured with the vibrate hole corresponding with described through hole;

Step 4, vibrates hole and the vibrator of vibrating spear is inserted in described space by through hole by described, then injects concrete in described space, and the concrete in described space is vibrated by described vibrator;

Step 5, end of vibrating, described vibrator is stayed in described space.

2. method according to claim 1, it is characterised in that be provided with multiple through hole in each described template, and the quantity of the through hole of the central region of described template is more than the quantity of the through hole of lower area.

3. method according to claim 1 and 2, it is characterised in that in described step 4, arranges described vibrator in a horizontal manner.

4. the method according to any one of Claim 1-3, it is characterised in that in described step one, arranges support member on bridge floor, and the arch springing of described arch rib is supported on described support member.

5. method according to claim 4, it is characterised in that in described step 2, the bar-mat reinforcement in described space includes the bar-mat reinforcement of the bar-mat reinforcement of level, vertical bar-mat reinforcement and inclination.

6. the method according to any one of claim 1 to 5, it is characterised in that in described step 4, successively injects concrete in described space, after handled concrete layer is closely knit, injects next layer concrete.

7. method according to claim 6, it is characterised in that in described step 4, is located on bar-mat reinforcement makes it that concrete within the scope of reservation to be vibrated by being tied up by described vibrator.

8. method according to claim 7, it is characterised in that after handled concrete layer is closely knit, before injecting next layer concrete, stays described vibrator in described concrete and uses perforations adding plate to block the hole of vibrating accordingly in described template.

9. method according to claim 8, it is characterised in that described in vibrate hole be shaped as be gradually reduced along towards the orient diameter in described space, the mating shapes in the shape of described perforations adding plate and described hole of vibrating.

10. method according to claim 9, it is characterised in that described perforations adding plate and described template are welded together with the method for many places means of spot welds.