CN106320184B - A kind of unit construction bridge beam construction method - Google Patents

Abstract

The invention provides a prefabricated bridge construction method, which solves the problems in the prior art such as difficult transportation and large time consumption, and ensures safe and efficient bridge construction. The prefabricated construction method is adopted, and the construction speed is fast. Two adjacent prefabricated bridge decks are connected by steel plates. The integrity of the structure is guaranteed, making it safer and more reliable. During the construction process, cable-stayed steel strands are used to connect the prefabricated bridge deck and the tower crane, which ensures the stability of the bridge deck and the safety of construction personnel operating on the bridge deck.

Description

A kind of prefabricated bridge construction method

technical field

The invention relates to the technical field of bridge engineering, in particular to an assembly bridge construction method.

Background technique

Our country is in the stage of vigorous infrastructure construction. Since the beginning of the 21st century, the mileage of our country's roads and railways has been built more than 10,000 kilometers every year. According to the requirements of the "Twelfth Five-Year Plan", by the end of 2015, the total mileage will reach 450 kilometers. The mileage of railway construction will also reach 120,000 kilometers. According to the idea of the "Thirteenth Five-Year Plan", improving the transportation network in the central and western regions will become the focus. For the central and western regions, the terrain and geological conditions are relatively complex, with vertical and horizontal hills and valleys. In order to shorten the travel time between the two places and ensure the traffic safety Comfort requires the construction of a large number of bridges.

As of 2013, the number of highway bridges in my country has reached 713,400. In order to control the cost, most bridges adopt the structural system of beam bridge and rigid frame bridge. For the bridge construction of these two structural systems, the overall assembly type is currently used more Or the hanging basket construction method, if the overall assembly construction method is adopted, large-scale machinery is required to transport large bridge decks to the site for assembly, and the general bridge construction is carried out in the mountainous areas of the central and western regions, and the transportation is inconvenient, so transportation is difficult to achieve; and for hanging baskets The traditional construction method usually uses both ends of the bridge to be constructed forward at the same time, and then closed in the middle. During the advancing process, it takes a certain amount of time for the poured concrete to reach a certain strength before it can continue to advance, which will waste a lot of time and is very unfavorable for projects with a tight construction period; in addition, because the concrete poured earlier has already A certain strength, so it will not be completely integrated with the post-poured concrete at the contact surface to form a whole, which will be detrimental to the bearing capacity of the bridge. At the same time, the hanging basket construction, which is equivalent to the cantilever beam construction, will cause excessive deflection deformation. The middle part may be unable to meet the deformation requirements due to excessive deflection, resulting in engineering unsafe factors.

Contents of the invention

The purpose of the present invention is to provide a prefabricated bridge construction method, which solves the problems of difficult transportation and large time consumption in the prior art, and ensures safe and efficient bridge construction.

The technical scheme adopted for realizing the object of the present invention is such, a kind of construction method of prefabricated bridge, comprises the following steps:

1) Investigate the site situation, determine the specific size of the bridge, the location of embankment A, the location of embankment B and the location of two piers.

2) Pour multiple prefabricated bridge decks whose overall shape is cuboid, and perform concrete curing on the prefabricated bridge decks according to the specification requirements.

Wherein: steel bars are pre-embedded in the prefabricated bridge deck. The two faces of the prefabricated bridge deck along the transverse direction are side faces, and the two faces along the longitudinal direction are end faces. The transverse length of the prefabricated bridge deck is equal to the width of the bridge deck, and the longitudinal length of the prefabricated bridge deck is 2-5m. The top surface of each prefabricated bridge deck is pre-embedded with several closed pull hooks. Both sides of each prefabricated bridge deck are provided with grooves close to the end faces. After the end faces of the two prefabricated bridge decks are closely attached, two adjacent grooves form a groove interface matched with the connecting steel plate.

3) According to the design requirements, two bridge piers are poured on site, and one end of the specified number of steel bars is erected and pre-buried in the bridge piers according to the design distribution.

4) Carry out maintenance on the pier according to the requirements of the specification.

5) Reinforce the tower crane standard section of the tower crane: Weld several cross bars and angle steels in the tower crane standard section. A number of tensile steel plates are welded on both sides of the tower crane standard section along the longitudinal direction of the bridge.

6) Erect the tower crane on the top of the pier. The tower crane and the pier are connected by high-strength bolts. Step 3) the steel bar passes through the bottom plate of the tower crane.

7) Carry out further reinforcement treatment on the bottom of the tower crane.

8) Install a rubber bearing on embankment A and embankment B respectively.

9) Transport the prefabricated bridge deck to the construction site.

10) Lay multiple prefabricated bridge decks sequentially along the longitudinal direction of the bridge: Use a tower crane to hoist a prefabricated bridge deck to the designated position. Use cable-stayed steel strands to connect the prefabricated bridge deck and the tower body of the tower crane. Lift the next prefabricated bridge deck to the designated position, and use cable-stayed steel strands to connect the prefabricated bridge deck and the tower body of the tower crane. The connecting steel plates are fixedly connected to two adjacent prefabricated bridge decks by means of high-strength bolts and/or welding. In the same way, continue to place prefabricated bridge decks until the design quantity is reached.

Among them: one end of the cable-stayed steel strand is welded on the tensile steel plate, and the other end passes through the closed hook of the prefabricated bridge deck and is anchored. The top surfaces of two adjacent prefabricated bridge decks are flush, and the end surfaces are close together. The connecting steel plates are completely embedded in the groove interface formed by the grooves of two adjacent prefabricated bridge decks.

11) Remove the tower crane to the height of the bridge deck. Ordinary concrete with the same strength level as the prefabricated bridge deck concrete is poured at the position where the remaining tower crane standard sections are located. The prefabricated deck layers of the bridge deck are thus formed.

12) Pour asphalt concrete layer on the upper part of the prefabricated bridge deck.

Further, after completing step 12), the bridge deck is beautified and waste materials are recycled.

Further, the length of the reinforcing bar in step 3) extending into the bridge pier is not less than one-third of the height of the bridge pier, and the length extending out from the top of the bridge pier is 200-500 mm.

Further, one end of the reinforcing bar protruding from the top of the pier in step 3) is threaded. In step 6), after the steel bars pass through the bottom plate of the tower crane, the high-strength nuts are screwed into the threads at the ends of these steel bars.

A prefabricated bridge built by the above-mentioned construction method of the prefabricated bridge includes a bridge deck, two piers and two rubber bearings.

The bridge deck is erected between embankment A and embankment B. The bridge deck and the bridge piers are connected by straight-through steel bars. A rubber bearing is installed between the bridge deck and the embankment.

The bridge deck includes a prefabricated bridge deck layer and an asphalt concrete layer. The asphalt concrete layer is laid on the prefabricated bridge deck layer and tightly bonded with the prefabricated bridge deck layer.

The prefabricated bridge deck layer includes a plurality of prefabricated bridge decks laid sequentially along the longitudinal direction of the bridge. The top surfaces of the prefabricated bridge decks are flush. The prefabricated bridge deck layer also has several groove interfaces on both sides along the width direction of the bridge deck. Adjacent prefabricated bridge decks are connected by plug-in fit between connecting steel plates and groove interfaces. The connecting steel plates use high-strength bolts to fix the adjacent prefabricated bridge decks as a whole.

Further, the joint shape of adjacent prefabricated bridge decks is flat joint, tongue-and-groove or zigzag.

Further, sealant is applied to the joints of adjacent prefabricated bridge decks.

Technical effect of the present invention is beyond doubt:

A) The bridge deck is prefabricated by on-site prefabrication or factory prefabrication, and only small transportation equipment is needed to realize component transportation, which overcomes the problem that large-scale transportation equipment cannot enter the site in remote mountainous areas;

B) The prefabricated assembly construction method is adopted, the construction speed is fast, and there is no maintenance and strength formation time for hanging basket construction, which can shorten the construction period;

C) Steel plates are used to connect two adjacent prefabricated bridge decks to ensure the integrity of the structure. At the same time, there is no situation that the cast-in-place concrete and post-cast concrete cannot be fully integrated in the hanging basket construction, which is safer and more reliable;

D) During the construction process, cable-stayed steel strands are used to connect the prefabricated bridge deck and the tower crane, which ensures the stability of the bridge deck and the safety of construction personnel operating on the bridge deck;

E) Using prefabricated component steel plates to connect, the construction period is short and the economic value is very obvious.

Description of drawings

Figure 1 is the construction drawing of the fabricated bridge;

Figure 2 is a schematic diagram of the structure of the prefabricated bridge deck;

Figure 3 is a bridge deck connection diagram;

Figure 4 is a schematic diagram of a tower crane standard section;

Figure 5 is a connection diagram between the tower crane and the bridge pier;

Figure 6 is a schematic diagram of the fabricated bridge structure.

In the figure: rubber bearing 1, pier 2, steel bar 201, connecting steel plate 3, threaded hole I301, prefabricated bridge deck 4, side 401, end face 402, groove 403, threaded hole II 4031, closed hook 404, groove interface 405, Cable-stayed steel strand 5, tower crane 6, bottom plate 601, tensile steel plate 602, asphalt concrete layer 7.

Detailed ways

The present invention will be further described below in conjunction with the examples, but it should not be understood that the scope of the subject of the present invention is limited to the following examples. Without departing from the above-mentioned technical ideas of the present invention, various replacements and changes made according to common technical knowledge and conventional means in this field shall be included in the protection scope of the present invention.

Example 1:

This embodiment discloses a construction method of a prefabricated bridge, referring to Fig. 1 to Fig. 6, including the following steps:

1) Investigate the site conditions, determine the specific size of the bridge, the location of embankment A, the location of embankment B and the location of two piers 2.

2) Pour a plurality of prefabricated bridge decks 4 whose overall shape is a cuboid, and perform concrete curing on the prefabricated bridge decks 4 according to the specifications. These prefabricated bridge decks 4 are pre-embedded with steel bars;

Wherein: the two faces of the prefabricated bridge deck 4 along the transverse direction are side faces 401 , and the two faces along the longitudinal direction are end faces 402 . The transverse length of the prefabricated bridge deck 4 is equal to the bridge deck width, and the longitudinal length of the prefabricated bridge deck 4 is 2-5m. Two closed hooks 404 are pre-embedded on the top surface of each prefabricated bridge deck 4 . Both sides 401 of each prefabricated bridge deck 4 are provided with grooves 403 near the end faces 402 . After the end surfaces 402 of the two prefabricated bridge decks 4 are closely attached, two adjacent grooves 403 form a groove interface 405 that cooperates with the connecting steel plate 3 . The connecting steel plate 3 is provided with 4 rows of threaded holes I301, 8 in each row. The corresponding position of the groove interface 405 is also provided with a threaded hole II 4031 .

3) Two bridge piers 2 are poured on site according to the design requirements, and one end of a specified number of steel bars 201 is vertically pre-embedded in the bridge piers 2 according to the design distribution. One end of these steel bars 201 protruding from the top of the pier 2 is threaded. The length of these steel bars 201 extending into the pier is not less than one-third of the height of the pier, and the length extending from the top of the pier is 200-500 mm.

4) Carry out maintenance on the pier 2 according to the requirements of the specification.

5) Reinforce the tower crane standard section of the tower crane 6: weld the cross bar and angle steel in the tower crane standard section. A plurality of tensile steel plates 602 are welded on both sides of the tower crane standard section along the longitudinal direction of the bridge.

6) Erect the tower crane 6 on the top of the pier 2. The pier 2 and the tower crane 6 are fixedly connected together by high-strength bolts. Step 3) After the steel bar 201 passes through the bottom plate 601 of the tower crane 6, tighten the high-strength nut on the thread at the end of the steel bar 201.

7) For the bottom part of the tower crane, which is less than one-third of the total height, the welded crossbar and angle steel are further reinforced to ensure that the tower crane and the pier form an integral work.

8) Install a rubber bearing 1 on embankment A and embankment B respectively.

9) Transport the prefabricated bridge deck 4 to the construction site.

10) Lay multiple pieces of prefabricated bridge decks 4 sequentially along the longitudinal direction of the bridge: use tower crane 6 to hoist a prefabricated bridge deck 4 to a designated position. A cable-stayed steel strand 5 is used to connect the prefabricated bridge deck 4 and the tower body of the tower crane 6 . The next prefabricated bridge deck 4 is hoisted to the designated position, and the cable-stayed steel strand 5 is used to connect the prefabricated bridge deck 4 and the tower body of the tower crane 6 . Two adjacent prefabricated bridge decks 4 are fixedly connected by connecting steel plates 3 . Similarly, continue to place the prefabricated bridge deck 4 until the design quantity is reached.

Wherein: one end of the cable-stayed steel strand 5 is welded on the tensile steel plate 602, and the other end passes through the closed hook 404 of the prefabricated bridge deck 4 and is anchored. The top surfaces of two adjacent prefabricated bridge decks 4 are flush, and the end surfaces 402 are close together. The connecting steel plates 3 are completely embedded in the groove interface 405 formed by the grooves 403 of two adjacent prefabricated bridge decks 4 . The high-strength bolts 302 penetrate through the threaded hole I301 and the threaded hole II4031 in sequence, and fix and connect two adjacent prefabricated bridge decks 4 together. The prefabricated bridge deck 4 far away from the tower crane 6 is connected with the standard joint at the top of the tower body, and the prefabricated bridge deck 4 close to the tower crane 6 is connected with the standard joint at the bottom of the tower body.

11) Remove the tower crane 6 to the height of the bridge deck. Pour ordinary concrete with the same strength level as the concrete of prefabricated bridge deck 4 at the position where the remaining tower crane standard sections are located. The prefabricated deck layers of the bridge deck are thus formed.

12) Pour the asphalt concrete layer 7 on the upper part of the prefabricated bridge deck.

13) Beautify the bridge deck and recycle waste materials.

Example 2

This embodiment discloses a prefabricated bridge built by the construction method of the prefabricated bridge described in Embodiment 1, including a bridge deck, two piers 2 and two rubber bearings 1 .

Referring to Fig. 6, the bridge deck is erected between embankment A and embankment B. The bridge deck and pier 2 are connected by straight through steel bars. A rubber bearing 1 is installed between the bridge deck and the embankment.

The bridge deck 1 includes a prefabricated bridge deck layer and an asphalt concrete layer 7 . The asphalt concrete layer 7 is laid on the prefabricated bridge deck layer and tightly bonded with the prefabricated bridge deck layer.

The prefabricated bridge deck layer includes a plurality of prefabricated bridge decks 4 sequentially laid along the longitudinal direction of the bridge. The top surfaces of the plurality of prefabricated bridge decks 4 are flush. The prefabricated bridge deck layer also has groove interfaces 405 on both sides along the width direction of the bridge deck. Adjacent prefabricated bridge decks 4 are connected by plug-in fitting between connecting steel plate 3 and groove interface 405 . The connecting steel plates 3 use high-strength bolts to fix the adjacent prefabricated bridge decks 4 as a whole. The joint shape of the adjacent prefabricated bridge decks 4 is a flat seam, and the joints of the adjacent prefabricated bridge decks 4 are coated with sealant.

Claims (7)

1. A kind of 1. construction method of packaged type bridges, it is characterised in that：Comprise the following steps：

   1) field condition is reconnoitred, determines the specific size of bridge, the position of embankment A, the position of embankment B and two bridge piers (2) Position；

   2) pour polylith global shape be cuboid prefabricated bridge (4), and according to code requirement to prefabricated bridge (4) into Row concrete curing；

   Wherein：Reinforcing bar is embedded with the prefabricated bridge (4)；Two faces of the prefabricated bridge (4) in transverse direction are Side (401), two faces along the longitudinal direction are end face (402)；It is wide that the lateral length of the prefabricated bridge (4) is equal to bridge floor Degree, the longitudinal length of prefabricated bridge (4) is 2~5m；The top surface of every piece of prefabricated bridge (4) is embedded with several closings and draws Hook (404)；On two sides (401) of every piece of prefabricated bridge (4) groove (403) is provided with by proximal end face (402) place；Two pieces After the end face (402) of prefabricated bridge (4) is close to, two adjacent grooves (403) form the groove coordinated with junction steel plate (3) and connect Mouth (405)；

   3) according to two bridge piers (2) of design requirement cast in situs, one end of the reinforcing bar (201) of specified quantity is erected by design distribution It is vertical to be embedded in bridge pier (2)；

   4) require to conserve bridge pier (2) according to specification regulation；

   5) standard section of tower crane of tower crane (6) is reinforced：Some cross bars of welding and angle steel in standard section of tower crane；Standard section of tower crane Along the both sides welding polylith tension steel plate (602) of bridge longitudinal direction；

   6) tower crane (6) is set up at the top of bridge pier (2)；The tower crane (6) is connected with bridge pier (2) using high-strength bolt；Step 3) institute The reinforcing bar (201) stated passes through the bottom plate (601) of tower crane (6)；

   7) further consolidation process is carried out to tower crane bottom；

   8) one rubber support (1) is installed respectively in embankment A and embankment B；

   9) transport prefabricated bridge (4) and arrive construction site；

   10) sequentially it is laid with polylith prefabricated bridge (4) along bridge longitudinal direction：One piece of prefabricated bridge (4) is hung using tower crane (6) It is filled to designated position；Use oblique pull steel strand wires (5) connection prefabricated bridge (4) and the tower body of tower crane (6)；Lift next piece it is prefabricated Floorings (4) reach designated position, use oblique pull steel strand wires (5) connection prefabricated bridge (4) and the tower body of tower crane (6)；Connection Two pieces of adjacent prefabricated bridges (4) are fixedly connected by steel plate (3) using high-strength bolt (302) and/or welding manner；Similarly after It is continuous to place prefabricated bridge (4) until reaching design quantity；

   Wherein：Oblique pull steel strand wires (5) one end is welded on tension steel plate (602), and the other end passes through the closing of prefabricated bridge (4) Drag hook (404) is simultaneously anchored；Adjacent two pieces of prefabricated bridges (4) either flush, end face (402) are close together；Connect steel Plate (3) is embedded in the groove interface (405) of groove (403) composition of adjacent two pieces of prefabricated bridges (4) completely；

   11) tower crane (6) is removed to bridge floor height；Poured in remaining standard section of tower crane position and prefabricated bridge (4) coagulation The consistent normal concrete of native strength grade；Thus the prefabricated bridge layer of bridge floor is formed；

   12) asphalt concrete layer (7) is poured on prefabricated bridge layer top.
2. A kind of 2. construction method of packaged type bridges according to claim 1, it is characterised in that：After completing step 12), Bridge floor is beautified and recycles obsolete material.
3. A kind of 3. construction method of packaged type bridges according to claim 1 or 2, it is characterised in that：Described in step 3) Reinforcing bar (201) stretches into 1/3rd that bridge pier length is not less than bridge pier height, and the length for stretching out pier coping portion is 200~500mm.
4. A kind of 4. construction method of packaged type bridges according to claim 1 or 2, it is characterised in that：Described in step 3) One end that reinforcing bar (201) is stretched out at the top of bridge pier (2) is tapped；In step 6), the reinforcing bar (201) passes through tower crane (6) After bottom plate (601), high-strength nut screws in the screw thread of these reinforcing bar (201) terminations.
5. A kind of 5. packaged type bridges that construction method by packaged type bridges described in claim 1 is built up, it is characterised in that：Bag Include bridge floor, two bridge piers (2) and two rubber supports (1)；

   The bridge floor is erected between embankment A and embankment B；Rubber support (1) is installed between the bridge floor and embankment；The bridge Face uses direct puncture bar connecting with bridge pier (2)；

   The bridge floor (1) includes prefabricated bridge layer and asphalt concrete layer (7)；The asphalt concrete layer (7) is laid on pre- On bridge floor flaggy processed, and with prefabricated bridge layer tight bond；

   The prefabricated bridge layer includes the prefabricated bridge (4) that polylith is longitudinally sequentially laid with along bridge；The prefabricated bridge floor Plate (4) either flush；The prefabricated bridge layer also has some groove interfaces (405) along the both sides in bridge deck width direction；Phase Adjacent prefabricated bridge (4) is connected by the inserting of the junction steel plate (3) and groove interface (405)；The junction steel plate (3) contiguous prefabricated floorings (4) are fixed as by entirety using the form of high-strength bolt.
6. A kind of 6. packaged type bridges according to claim 5, it is characterised in that：The seam shape of contiguous prefabricated floorings (4) Shape is flush joint, rabbet-shaped or zigzag.
7. A kind of 7. packaged type bridges according to claim 5 or 6, it is characterised in that：The seam of contiguous prefabricated floorings (4) Middle painting is formed with fluid sealant.