Large-span prestressed capping beam of gate-type pier over-crossing existing line of road

Abstract

The utility model provides an overpass road existing line gate-type pier large-span prestress cover beam which comprises a pile foundation, a bearing platform and a pier column which are installed in sequence, the periphery of the pier column is wrapped with a protective film, a backfill soil body is arranged at the bottom of the cover beam, a concrete cushion layer is poured on the backfill soil body, and when construction of the cover beam is completed, a step slope is formed on the lower side of the backfill soil body; the backfill soil body is utilized to play a supporting role, compared with traditional steel bar supporting construction, operation is easy and convenient, construction safety is high, the construction period is effectively shortened, and the overall construction quality of the bent cap is well guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge construction field especially relates to the door type pier large span prestressed bent cap of crossing road existing line. BACKGROUND

[0002] In order to meet the increasing traffic demand, the bridge engineering field faces more and more challenges, and more large-span, high-strength bridges need to be built. In bridge construction, it is often necessary to cross obstacles such as rivers and existing lines. The door type pier large span prestressed bent cap becomes an effective means to solve such problems due to its strong crossing capacity, and therefore is widely used in engineering. However, under the influence of factors such as limited site and complex construction environment, the traditional large-span prestressed bent cap construction process has the disadvantages of long construction period, high construction risk and great impact on the surrounding environment, and has been difficult to meet the goal of high-quality construction. Therefore, it is of great significance to study the door type pier large-span prestressed bent cap of crossing road existing line and the construction method. SUMMARY

[0003] The utility model discloses a door type pier large span prestressed bent cap of crossing road existing line which solves the above technical problems.

[0004] To solve the above technical problems, the utility model provides a door type pier large span prestressed bent cap of crossing road existing line, which comprises pile foundation, bearing platform and pier column installed in sequence, the pier column is wrapped with protective film, backfill soil body is arranged at the bottom of the bent cap, a concrete cushion layer is poured above the backfill soil body, and a slope is formed on the lower side of the backfill soil body when the bent cap construction is completed.

[0005] Further, when the pier body construction adopts support support, the steel pipe column section is installed on the enlarged foundation, the steel pipe column base is installed on the upper part of the enlarged foundation, and the steel pipe column base is connected with the enlarged foundation through anchoring reinforcement.

[0006] Further, a steel pipe stand is installed above the side of the bent cap on the bearing platform, a prestressed operation platform is installed on the steel pipe stand, a vertical support is arranged above the prestressed operation platform for installing I-steel sliding rail, and the end of the I-steel sliding rail is inserted into the reserved hole at the top of the side of the bent cap.

[0007] Further, a plurality of limiting blocks are arranged on the upper side of the I-steel sliding rail at intervals, and the cross beam is arranged between the adjacent two limiting blocks.

[0008] Further, the steel pipe column base comprises lower flange plate and upper flange plate, and the anchoring reinforcement connects the lower flange plate with the enlarged foundation.

[0009] Further, the steel pipe is arranged between the lower flange plate steel plate and the upper flange plate steel plate, and the steel pipe is provided with stiffening ribs between the lower flange plate steel plate and the upper flange plate steel plate.

[0010] Further, the anchor plate at the bottom of the steel pipe column is connected with the bearing platform through the anchor bolt, and at least two steel hoops are arranged between the side surface of the steel pipe column and the pier column.

[0011] Further, the platform bottom steel plate is arranged above the prestressed operation platform, and the construction guardrail is arranged around the prestressed operation platform.

[0012] Further, the prestressed operation platform is supported above the bearing platform through the steel pipe column; the prestressed operation platform comprises a longitudinal framework and a transverse framework arranged at the top end of the steel pipe column, a vertical support is arranged at the lower side of the I-shaped steel sliding rail, and the vertical support is arranged on the longitudinal framework.

[0013] The utility model discloses the beneficial effect lies in:

[0014] (1) utilize backfill soil body to play the supporting effect, compared with traditional steel rod support construction operation simple, construction safety is high, effectively saves the construction period, and the overall construction quality of bent cap has also been well guaranteed;

[0015] (2) prefabricated enlarged foundation is made in factory, and the prefabricated enlarged foundation is placed on the existing road and is stably connected with the steel pipe column segment through bolt when supporting system construction, so that the supporting system construction is convenient, and the turnover utilization rate of enlarged foundation is improved;

[0016] (3) when assembling bent cap reinforcement framework, high-strength corrugated pipe is installed in the specified position simultaneously, and steel strand is penetrated, after installation is completed, overall hoisting is carried out, the risk of later high-altitude operation is reduced, construction efficiency is improved, and the influence on the lower existing line is reduced;

[0017] (4) prestressed operation platform is supported by arranging inclined steel pipe column on the side of bent cap, and I-shaped steel sliding rail and cross beam are installed above, the worker operating space and convenience are increased, the cross beam can be conveniently suspended and tensioned jack, so that the jack position can be flexibly adjusted in high altitude, and the on-site tensioning operation is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Low pier side bent cap soil cultivation construction technology schematic view

[0019] Figure 2 Prefabricated assembly type enlarged foundation structure schematic view

[0020] Figure 3 Prefabricated assembly type enlarged foundation front view

[0021] Figure 4 Steel strand first through steel cage prefabricated assembly technology schematic view

[0022] Figure 5 Cap beam prestressed operation platform optimization technology schematic view

[0023] Figure 6 Steel pipe column hoop pier column structure plan view

[0024] Figure 7 Prestressed operation platform side view

[0025] The figure mark explanation: 1-cap beam, 2-backfill soil body, 3-slope, 4-protection film, 5-pier, 6-pile cap, 7-pile foundation, 8-enlarged foundation, 9-lower flange steel plate, 10-stiffening rib, 11-steel pipe, 12-bolt hole, 13-anchoring bar, 14-upper flange steel plate, 15-steel pipe column, 16-steel hoop, 17-anchor pad, 18-anchor bolt, 19-longitudinal framework, 20-platform bottom steel plate, 21-guardrail, 22-reserved hole, 23-crossbeam, 24-limiting block, 25-I-beam sliding rail, 26-vertical support, 27-transverse framework, 28-cap beam reinforcement framework, 29-corrugated pipe, 30-steel strand. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0027] Those skilled in the art should understand that in the disclosure of the present application, the orientations or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation on the present application.

[0028] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0029] As Figures 1-7The utility model provides a kind of upper crossing road existing line portal pier large-span prestressed cover beam, which can use the following steps during construction:

[0030] S1, as Figure 1 shown, for the cover beam 1 with a pier body lower than the standard height, after completing the construction of the bridge lower pile foundation 7, pile cap 6 and pier column 5 structure, the protective film 4 is used to protect and wrap around the pier column 5 to avoid contamination during subsequent construction. Then, according to the elevation of the bottom position of the cover beam 1, the backfill soil 2 is constructed, and after the backfill soil 2 is compacted, the concrete cushion is poured and leveled on top to provide support. Then, the cover beam 1 formwork is laid, the steel reinforcement cage is hoisted, and the concrete is poured. After the construction of the cover beam 1 is completed, the lower backfill soil 2 is excavated and the construction slope 3 is constructed. Finally, the protective film 4 wrapped around the pier column 5 is removed, and the pier column 5 and the cover beam 1 surface are cleaned and decorated.

[0031] Wherein, when the protective film 4 is used to wrap around the pier column 5, the protective film 4 is made of plastic film + waterproof geotextile, and the plastic film is arranged in at least two layers.

[0032] The standard height of the pier body is obtained by on-site specific measurement and overall structure size evaluation.

[0033] S2, when the pier body is higher than the standard height, a support is needed for construction. The enlarged foundation 8 is prefabricated in the factory in advance, and the steel pipe column base is installed on the upper part of the enlarged foundation 8. The steel pipe column base is fixedly connected with the enlarged foundation 8 through the anchoring bars 13. After the completion of the production, the enlarged foundation 8 is transported to the site and placed on the existing road. After the installation is completed, the steel pipe column segment to be assembled on site is installed on the enlarged foundation 8. After the steel pipe column segment is hoisted to the corresponding position, the bolt is used to pass through the bolt hole 12 on the steel pipe column segment and the upper flange plate steel plate 14 to stably connect. After the construction is completed, the on-site support frame can be quickly disassembled and transported. The enlarged foundation 8 is transported to the next construction position, improving the material turnover.

[0034] As Figure 2 , Figure 3As shown, before the construction of the field support system, the enlarged foundation 8 is prefabricated in the factory in advance to meet the rapid turnover use during construction. The position of the embedded part needs to be checked multiple times during the production process to ensure the quality of the components; the steel pipe column base is pre-installed at the upper part during the production of the enlarged foundation 8; the steel pipe column base includes a lower flange plate 9 and an upper flange plate 14; the anchor bar 13 anchors and connects the lower flange plate 9 and the enlarged foundation 8; a steel pipe 11 is arranged between the lower flange plate 9 and the upper flange plate 14; and stiffening ribs 10 are arranged between the steel pipe 11 and the lower flange plate 9 and between the steel pipe 11 and the upper flange plate 14; when transported to the site for installation, the enlarged foundation 8 is placed at the specified position, then the bottom of the steel pipe column segment to be assembled is aligned with the upper flange plate 14, and the bolt hole 12 is used to stably connect the steel pipe column segment to the upper flange plate 14.

[0035] S3, the field operation space is limited, so the bent cap steel reinforcement cage 28 is selected to be assembled near the construction site. When the bent cap steel reinforcement cage 28 is assembled and constructed, the corrugated pipe 29 in the bent cap 1 is pre-installed together with the steel strand 30. The corrugated pipe 29 is made of high-strength material to enhance its stiffness, so as to avoid construction loss and affect the quality. After the corrugated pipe 29 is installed to the specified position, the steel strand 30 is inserted into the corrugated pipe 29, and the exposed part of the steel strand 30 is wrapped and protected with a plastic film. After assembly is completed, the whole bent cap steel reinforcement cage 28 is hoisted to the specified position for subsequent construction.

[0036] As shown in Figure 4 Due to the influence of the surrounding existing lines, the construction site is limited. First, the processed steel reinforcement semi-finished product is assembled into a whole bent cap steel reinforcement cage 28 near the construction site. The bent cap steel reinforcement cage 28 needs to be measured frequently to ensure the assembly accuracy. After assembly is completed, the protection is strengthened to prevent damage.

[0037] S4, before the prestressed construction of the bent cap 1, first install the steel pipe column 15 on the side of the bent cap 1 and above the pile cap 6. The anchor pad 17 at the bottom of the steel pipe column 15 is temporarily fixed to the pile cap 6 by using the anchor bolt 18. Then, two steel hoops 16 are welded on the side of the steel pipe column 15 to establish a stable horizontal connection with the pier column 5. Then, the prestressed operation platform is installed. The vertical support 26 is arranged above the prestressed operation platform for the installation of the I-beam sliding rail 25. The end of the I-beam sliding rail 25 is inserted into the reserved hole 22 at the top of the side of the bent cap 1. Finally, the platform bottom steel plate 20 is laid above the prestressed operation platform, and the construction guardrail 21 is installed around the prestressed operation platform. When the position of the equipment needs to be adjusted for prestressed tensioning construction, the cross beam 23 is placed between the limiting blocks 24 of the I-beam sliding rail 25. By using the cross beam 23 and the chain hoist, the tensioning equipment can be moved and adjusted within a small range. Compared with large lifting machinery, the position of the tensioning equipment can be adjusted more flexibly.

[0038] As shown in Figures 5-7The prestress operation platform is arranged at the position above the bearing platform 6 and the side of the bent cap 1, the length of the prestress operation platform of the bent cap 1 is kept at about 2m, the prestress operation platform is supported above the bearing platform 6 through the steel pipe stand 15, the prestress operation platform comprises the longitudinal framework 19 and the transverse framework 27 which are welded on the top of the steel pipe stand 15, and the vertical support 26 is arranged below the I-shaped steel slide rail 25 and is arranged on the longitudinal framework 19.

[0039] The utility model is not limited to the above-mentioned best implementation, and anyone can draw other various forms of products under the enlightenment of the utility model, but no matter make any change in its shape or structure, all have the same or similar technical scheme with the application, fall in the protection scope of the utility model.

Claims

1. A large-span prestressed bent cap of portal pier across existing line of road, characterized in that: The pylon (5) is wrapped with a protective film (4), the backfill soil body (2) is arranged at the bottom of the bent cap (1), a concrete cushion is poured above the backfill soil body (2), and a slope (3) is arranged at the lower side of the backfill soil body (2) when the bent cap (1) is constructed.

2. The large-span prestressed bent cap of the portal pier of the existing line of the overpass road according to claim 1, characterized in that: When the pylon body is constructed by using a support, the steel pipe column segment is installed on the enlarged foundation (8), the steel pipe column base is installed on the upper portion of the enlarged foundation (8), and the steel pipe column base is connected with the enlarged foundation (8) through the anchoring rib (13).

3. The large-span prestressed bent cap of the portal pier of the existing line of the overpass road according to claim 1, characterized in that: The steel pipe stand (15) is installed on the side of the bent cap (1) above the bent cap (6), the prestressed operation platform is installed on the steel pipe stand (15), the vertical support (26) is arranged above the prestressed operation platform and used for installing the I-steel sliding rail (25), and the end portion of the I-steel sliding rail (25) is inserted into the reserved hole (22) at the top of the bent cap (1).

4. The overpass road existing line portal pier large-span prestressed bent cap according to claim 3, characterized in that: The I-steel sliding rail (25) is arranged with a plurality of limiting blocks (24) at intervals on the upper side, and the cross beam (23) is arranged between the adjacent two limiting blocks (24).

5. The overpass road existing line portal pier large-span prestressed bent cap according to claim 2, characterized in that: The steel pipe column base comprises a lower flange plate (9) and an upper flange plate (14), and the anchoring rib (13) is used for connecting the lower flange plate (9) with the enlarged foundation (8).

6. The overpass road existing line portal pier large-span prestressed bent cap according to claim 5, characterized in that: The steel pipe (11) is arranged between the lower flange plate (9) and the upper flange plate (14), and the stiffening rib (10) is arranged between the steel pipe (11) and the lower flange plate (9) and between the steel pipe (11) and the upper flange plate (14).

7. The overpass road existing line portal pier large-span prestressed bent cap according to claim 3, characterized in that: The anchor pad (17) at the bottom of the steel pipe stand (15) is connected with the bent cap (6) through the anchor bolt (18), and at least two steel hoops (16) are arranged between the side surface of the steel pipe stand (15) and the pylon (5).

8. The overpass road existing line portal pier large-span prestressed bent cap according to claim 3, characterized in that: The platform bottom steel plate (20) is arranged above the prestressed operation platform, and the construction guardrail (21) is arranged around the prestressed operation platform.

9. The overpass road existing line portal pier large-span prestressed bent cap according to claim 3, characterized in that: The prestressed operation platform is supported above the bent cap (6) through the steel pipe stand (15); the prestressed operation platform comprises the longitudinal framework (19) and the transverse framework (27) arranged at the top end of the steel pipe stand (15), the vertical support (26) is arranged at the lower side of the I-steel sliding rail (25), and the vertical support (26) is arranged on the longitudinal framework (19).

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