Quick dismantling device for multi-hole cross-door-opening type steel pipe support

Abstract

The utility model provides a porous door opening crossing type steel pipe support quick dismantling device which comprises strip-shaped foundations arranged on the two sides and the center of a two-way lane, steel pile stand columns are fixed to the tops of the strip-shaped foundations, load-bearing cross beams are fixed to the tops of the steel pile stand columns located on the same side, and longitudinal beams are fixed to the tops of the load-bearing cross beams in a crossing mode. A bottom die supporting system used for supporting a bottom die of the cast-in-place box beam is fixed to the top of the longitudinal beam. A plurality of finish rolling deformed steel bars are arranged between the cast-in-place box girder and the bearing cross beam in a penetrating mode, and the lower portions of the finish rolling deformed steel bars are matched with the bottom end face of the bearing cross beam through lower portion limiting structures. And a supporting and lowering mechanism which is used for supporting the finish rolling deformed steel bars and can alternately lower the finish rolling deformed steel bars is mounted between the upper parts of the finish rolling deformed steel bars and the top end surface of the cast-in-place box girder. It can be ensured that vehicles which are crossed can still pass normally in the support dismantling process, and the method is suitable for dismantling the cast-in-place box girder door opening type steel pipe support with large passing pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of cast-in-place reinforced concrete box girder bridge portal steel pipe supports, and mainly relates to a rapid demolition device for multi-hole cross-portal steel pipe supports. Background Technique

[0002] The spans of newly built bridges across existing national and provincial trunk roads are generally large, and cast-in-place reinforced concrete box girder structures are mostly used for crossing. To ensure the normal two-way passage of vehicles on the intersecting road, double-portal steel pipe supports are often used for the construction of cast-in-place box girders. Since the erection and demolition of portal supports involve high-altitude, hoisting and cross operations, the safety risks are high. Compared with the installation of portal supports, the demolition of the supports is limited by the already formed box girders, with smaller operating space, higher construction difficulty and greater potential safety hazards. The conventional method for demolishing portal steel pipe supports is to use the sand cylinders at the top of the steel pipe columns to lower the scaffolds, and then demolish the entire support system in accordance with the general principle of "support first and then demolish". However, the height of the sand cylinder for lowering the scaffolds is limited, providing a small space for the demolition of the support formwork, affecting the overall demolition speed of the supports and the traffic safety of the vehicles under the supports. Double-portal steel pipe supports usually consist of three rows of steel pile columns. The middle row of steel pipe columns needs to bear the loads of the supports above the holes on both sides. When the middle steel pipe support drops, it will affect the traffic of vehicles in both side channels. Generally, it is necessary to temporarily block the road or build a temporary traffic diversion road for drainage. The former affects road traffic, and the latter requires additional construction investment, and there are certain safety hazards during the diversion period. Traffic accidents may occur on sections with heavy traffic. Content of the Utility Model

[0003] To solve the above technical problems, the utility model provides a rapid demolition device for multi-hole cross-portal steel pipe supports. The device is made of common materials and has a simple structure. It can lock, lower and demolish each hole cross-portal steel pipe support respectively, and is especially suitable for the construction of high-grade highways with high traffic safety requirements; it can ensure that the vehicles on the intersecting road can still pass normally during the support demolition process, and is suitable for the demolition of cast-in-place box girder portal steel pipe supports with high traffic pressure.

[0004] To achieve the above technical features, the purpose of the utility model is realized as follows: A rapid demolition device for multi-hole cross-portal steel pipe supports includes strip foundations arranged on both sides and in the middle of a two-way lane. Steel pile columns are fixed on the top of the strip foundations. The tops of the steel pile columns on the same side are fixed with load-bearing crossbeams. A longitudinal beam is fixedly spanned on the top of the load-bearing crossbeams. A bottom formwork support system for supporting the bottom formwork of the cast-in-place box girder is fixed on the top of the longitudinal beam; A plurality of high-strength threaded steel bars penetrate between the cast-in-place box girder and the load-bearing crossbeam, and the lower part of the high-strength threaded steel bars is matched with the bottom end surface of the load-bearing crossbeam through a lower limit structure;

[0005] A supporting and lowering mechanism is installed between the upper part of the fine-rolled threaded steel bar and the top end surface of the cast-in-place box girder, which is used to support the fine-rolled threaded steel bar and can be lowered alternately.

[0006] Preferably, oblique reinforcement rods are fixed between a plurality of steel pile columns located at the top of the same strip foundation.

[0007] Preferably, a steel bar skeleton is provided inside the strip foundation and is cast with concrete;

[0008] Preferably, the longitudinal beams and the load-bearing cross beams are respectively made of I-beams.

[0009] Preferably, the load-bearing crossbeam and the cast-in-place box beam are provided with reserved holes for passing the fine-rolled threaded steel bars, and the diameter of the reserved holes is larger than the diameter of the fine-rolled threaded steel bars.

[0010] Preferably, the lower limiting structure includes a lower nut installed at the lower part of the fine-rolled threaded steel bar, and a lower steel gasket is arranged between the lower nut and the bottom end surface of the load-bearing beam.

[0011] Preferably, the supporting and lowering mechanism includes a reaction seat supported on the top of the cast-in-place box girder, the top of the reaction seat is supported by a through-type jack, the upper part of the fine-rolled threaded steel bar passes through the reaction seat and the through-type jack in sequence, the upper part of the fine-rolled threaded steel bar and the top of the through-type jack are installed with an upper steel gasket and an upper nut, and a middle nut is arranged between the fine-rolled threaded steel bar and the top of the cast-in-place box girder.

[0012] Preferably, the lower nut and the upper nut each adopt a double nut structure.

[0013] Preferably, when the multi-hole door opening supports need to be removed separately, an auxiliary load-bearing beam needs to be added to fix the upper structure of the steel pile column of another hole.

[0014] The utility model has the following beneficial effects:

[0015] 1. The utility model is easy to construct, the process procedure is clear and easy to understand, the operability is strong, the bracket falls to a large height, and the dismantling space is large.

[0016] 2. The utility model uses a temporary anchoring structure formed by fine-rolled threaded steel and I-beams, which can "break the whole into pieces" of the support system and dismantle it in blocks, ensuring a single-lane double-pass on one side without affecting the passage of vehicles and avoiding the investment in maintaining the access road. This structure is simple in form, easy to dismantle and convenient to operate.

[0017] 3. The utility model utilizes existing materials on site as unloading devices, eliminates the need for sand barrels, and directly arranges I-beams on steel pipe columns, which effectively reduces construction costs while enhancing the integrity of the support system.

[0018] 4. The utility model adopts the method of first dismantling the steel pile columns, and then lowering the horizontal beams and longitudinal beam platforms to a lower position, changing the "high altitude" to "low altitude", and even directly landing on the ground, and then adopting machinery to carry out the demolition construction, which speeds up the demolition efficiency and eliminates the safety hazards of high-altitude operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a front schematic diagram of the dismantling arrangement of the doorway type steel pipe support of the utility model.

[0021] Figure 2 For the utility model Figure 1 A partial enlarged view of the location of the middle support lowering mechanism.

[0022] Figure 3 This is a bar-shaped basic structure diagram of the utility model.

[0023] Figure 4 It is a side schematic diagram of the dismantling arrangement of the doorway type steel pipe support of the utility model.

[0024] Figure 5 For this utility model Figure 4 A partial enlarged view of the location of the middle support lowering mechanism.

[0025] Figure 6 For this utility model Figure 4 A partial enlarged view of the location of the auxiliary load-bearing beam in the middle.

[0026] In the figure: fine-rolled threaded steel 1, upper nut 2, upper steel washer 3, through-type jack 4, reaction seat 5, cast-in-place box beam 6, longitudinal beam 7, load-bearing beam 8, steel pile column 9, strip foundation 10, bottom form support system 11, auxiliary load-bearing beam 12, middle nut 13, lower nut 14, lower steel washer 15, oblique reinforcement rod 16;

[0027] Steel reinforcement skeleton 1001. DETAILED DESCRIPTION

[0028] The embodiments of the present utility model are further described below in conjunction with the accompanying drawings.

[0029] Embodiment 1:

[0030] See also Figures 1-6, A rapid demolition device for a porous cross - portal steel pipe support, which includes strip foundations 10 arranged on both sides and the central part of a two - way lane. A steel pile column 9 is fixed on the top of the strip foundation 10. The tops of the steel pile columns 9 on the same side are fixed with load - bearing cross - beams 8. A longitudinal beam 7 is fixedly spanned on the top of the load - bearing cross - beam 8. A bottom formwork support system 11 for supporting the bottom formwork of the cast - in - place box girder 6 is fixed on the top of the longitudinal beam 7; A plurality of high - strength deformed steel bars 1 penetrate through between the cast - in - place box girder 6 and the load - bearing cross - beam 8. The lower part of the high - strength deformed steel bar 1 is matched with the bottom end surface of the load - bearing cross - beam 8 through a lower limiting structure; A support and lowering mechanism for supporting the high - strength deformed steel bar 1 and capable of being alternately lowered is installed between the upper part of the high - strength deformed steel bar 1 and the top end surface of the cast - in - place box girder 6. The components of this device are common and the structural form is simple. It can lock, lower and demolish each hole cross - portal steel pipe support respectively, and is especially suitable for construction across high - grade highways with high traffic - maintaining requirements; It can ensure that vehicles on the intersecting road can still pass normally during the process of scaffold demolition, and is suitable for demolishing the portal steel pipe support of cast - in - place box girders with large traffic pressure.

[0031] Further, the length of the high - strength deformed steel bar 1 is comprehensively determined by considering the bridge height, lifting height and falling height. The position of the reserved hole is accurate to ensure that the high - strength deformed steel bar 1 is installed vertically.

[0032] Further, an inclined reinforcing bar 16 is fixed between multiple steel pile columns 9 on the top of the same strip foundation 10. The stability of the steel pile column 9 is enhanced by the inclined reinforcing bar 16.

[0033] Further, a steel bar skeleton 1001 is arranged inside the strip foundation 10 and is formed by pouring concrete;

[0034] Further, both the longitudinal beam 7 and the load - bearing cross - beam 8 are made of I - shaped steel respectively.

[0035] Further, reserved holes for passing through the high - strength deformed steel bar 1 are arranged on the load - bearing cross - beam 8 and the cast - in - place box girder 6. The diameter of the reserved hole is larger than the diameter of the high - strength deformed steel bar 1. Thus, the high - strength deformed steel bar 1 can move a small distance in the plane.

[0036] Further, the lower limiting structure includes a lower nut 14 installed at the lower part of the high - strength deformed steel bar 1, and a lower steel gasket 15 is arranged between the lower nut 14 and the bottom end surface of the load - bearing cross - beam 8. Through the above - mentioned lower limiting structure, it is ensured that the weight of the upper part of the entire load - bearing cross - beam 8 can be borne by the high - strength deformed steel bar 1.

[0037] Further, the support lowering mechanism includes a reaction seat 5 supported on the top of the cast-in-place box beam 6, the top of the reaction seat 5 supports a through-type jack 4, the upper part of the fine-rolled threaded steel bar 1 passes through the reaction seat 5 and the through-type jack 4 in sequence, the upper part of the fine-rolled threaded steel bar 1 and the top of the through-type jack 4 are installed with an upper steel gasket 3 and an upper nut 2, and a middle nut 13 is arranged between the fine-rolled threaded steel bar 1 and the top of the cast-in-place box beam 6. The load-bearing crossbeam 8 can be lowered alternately by the above-mentioned support lowering mechanism.

[0038] Furthermore, the lower nut 14 and the upper nut 2 both adopt a double nut structure, thereby ensuring the reliability of the support.

[0039] Further, when the multi-hole door opening brackets need to be removed respectively, an auxiliary load-bearing crossbeam 12 needs to be added to fix the upper structure of another hole steel pile column 9. The above-mentioned auxiliary load-bearing crossbeam 12 ensures safety.

[0040] Embodiment 2:

[0041] A method for quickly dismantling a multi-hole cross-doorway steel pipe support, the dismantling method is implemented by using the dismantling device, and comprises the following steps:

[0042] Step 1: Pass the fine-rolled threaded steel bar 1 through the reserved holes of the cast-in-place box beam 6 and the load-bearing crossbeam 8, and temporarily lock the upper and lower ends of the fine-rolled threaded steel bar 1 with the middle nut 13 and the lower nut 14;

[0043] Step 2: four reaction seats 5 are placed on the four finished rolled threaded steel bars 1 of the cast-in-place box girder 6 that are about to be lowered, and through-type jacks 4 are placed on the reaction seats 5. The upper steel gasket 3 and the upper nut 2 are placed on the top of the through-type jacks 4;

[0044] Step 3: Remove the steel pile column 9. At this time, the weight of the entire steel pipe support including the load-bearing crossbeam 8 and above is transferred from the fine-rolled threaded steel bar 1 to the cast-in-place box beam 6, completing the force conversion from support to support;

[0045] Step 4: After the through-type jack 4 is lifted to a certain stroke, the upper nut 2 is tightened, and the middle nut 13 inside the reaction seat 5 is rotated upward while the through-type jack 4 is slowly retracted. The entire steel pipe support and the fine-rolled threaded steel 1 slowly descend under the action of their own weight as the jack 4 retracts. After one stroke of retraction is completed, the middle nut 13 inside the reaction seat 5 is tightened, and the upper nut 2 is rotated upward for one stroke, and the through-type jack 4 is lifted again until the upper nut 2 is stressed.

[0046] Step 5: Repeat step 4 until the entire steel pipe support is lowered to the designated position;

[0047] Step 6: Use machinery and manual labor to demolish the formwork, square timbers, distribution beams, and bottom formwork support system 11, and finally disassemble the demolition device to complete the demolition of the steel pipe support for this span;

[0048] Step 7: Repeat Steps 1 to 6 to complete the demolition of the steel pipe supports for the remaining spans;

[0049] Step 8: Demolish the strip foundation 10 and restore the road surface across the road.

[0050] When lowering the steel pipe support in Step 4, the superstructure of adjacent spans is fixed with the newly added auxiliary load-bearing cross beam 12 to prevent the lowering of the existing middle load-bearing cross beam 8 of the steel pile column 9 from affecting the structure of another span.

Claims

1. A rapid demolition device for a porous cross - portal steel pipe support, characterized in that, The invention comprises a strip foundation (10) arranged on both sides and the center of a two-way lane, a steel pile column (9) being fixed on the top of the strip foundation (10), a load-bearing crossbeam (8) being fixed on the top of the steel pile column (9) on the same side, a longitudinal beam (7) being fixed across the top of the load-bearing crossbeam (8), and a bottom formwork support system (11) for supporting the bottom formwork of a cast-in-place box beam (6) being fixed on the top of the longitudinal beam (7); a plurality of fine-rolled threaded steel bars (1) being arranged between the cast-in-place box beam (6) and the load-bearing crossbeam (8), and the lower part of the fine-rolled threaded steel bars (1) being matched with the bottom end surface of the load-bearing crossbeam (8) through a lower limiting structure; A supporting and lowering mechanism for supporting the finished rolled threaded steel bar (1) and capable of alternately lowering the finished rolled threaded steel bar (1) is installed between the upper portion of the finished rolled threaded steel bar (1) and the top end surface of the cast-in-place box girder (6).

2. The rapid removal device for a porous cross - portal steel pipe support according to claim 1, characterized in that: An oblique reinforcing rod (16) is fixed between a plurality of steel pile columns (9) located at the top of the same strip foundation (10).

3. The rapid removal device for a porous cross - portal steel pipe support according to claim 2, characterized in that: A steel frame (1001) is provided inside the strip foundation (10) and is cast with concrete; The longitudinal beam (7) and the load-bearing cross beam (8) are respectively made of I-beams.

4. The rapid removal device for a porous cross - portal steel pipe support according to claim 1, characterized in that: The load-bearing crossbeam (8) and the cast-in-place box beam (6) are provided with reserved holes for passing the fine-rolled threaded steel bars (1), and the diameter of the reserved holes is larger than the diameter of the fine-rolled threaded steel bars (1).

5. The rapid removal device for a porous cross - portal steel pipe support according to claim 1 is characterized in that: The lower limiting structure comprises a lower nut (14) installed at the bottom of the finely rolled threaded steel bar (1), and a lower steel gasket (15) is arranged between the lower nut (14) and the bottom end surface of the load-bearing crossbeam (8).

6. The quick demolition device for a porous cross - portal steel pipe support according to claim 5, characterized in that: The support lowering mechanism comprises a reaction seat (5) supported on the top of the cast-in-place box girder (6); the top of the reaction seat (5) is supported by a through-type jack (4); the upper part of the fine-rolled threaded steel (1) passes through the reaction seat (5) and the through-type jack (4) in sequence; an upper steel gasket (3) and an upper nut (2) are installed on the upper part of the fine-rolled threaded steel (1) and at the top of the through-type jack (4); and a middle nut (13) is arranged between the fine-rolled threaded steel (1) and the top of the cast-in-place box girder (6).

7. The rapid removal device for a porous cross - portal steel pipe support according to claim 5, characterized in that: The lower nut (14) and the upper nut (2) both adopt a double nut structure.

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