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

Abstract

The invention provides a porous door opening crossing type steel pipe support quick dismantling device and method.The device 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, bearing cross beams are fixed to the tops of the steel pipe stand columns located on the same side, and longitudinal beams are fixed to the tops of the 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 invention relates to the technical field of cast-in-place reinforced concrete box girder bridge portal steel pipe supports, and mainly relates to a device and method for quickly dismantling a multi-hole span portal steel pipe support. Background Art

[0002] The span of newly built bridges across existing national and provincial trunk roads is generally large, and most of them are spanned by cast-in-place reinforced concrete box beam structures. In order to ensure the normal two-way traffic of vehicles on the crossing road, double-portal steel pipe supports are often used for the construction of cast-in-place box beams. Since the erection and dismantling of portal supports involve high-altitude, hoisting and cross-operation, the safety risk is high. Compared with the installation of portal supports, the dismantling of the supports is limited by the formed box beams, and the operating space is smaller, the construction difficulty is higher, and the safety hazards are greater. The conventional method for dismantling portal steel pipe supports is to use the sand barrel on the top of the steel pipe column to dismantle the support, and then dismantle the entire support system according to the general principle of "support first and then dismantle". However, the height of the sand barrel drop is limited, and the space for dismantling the support template is small, which affects the overall dismantling speed of the support and the traffic safety of vehicles under the support. Double-portal steel pipe supports are usually composed of three rows of steel pipe columns. The middle row of steel pipe columns needs to bear the upper support load of the holes on both sides. When the middle steel pipe support leaks, it will affect the passage of vehicles on both sides of the channel. Generally, it is necessary to temporarily intercept the road or build an auxiliary road to divert traffic. The former affects road traffic, and the latter requires increased construction investment. There are certain safety hazards during the diversion period, and traffic accidents may occur on sections with heavy traffic. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a device and method for quickly dismantling a multi-hole cross-doorway steel pipe support. The device is made of common materials and has a simple structure. It can lock, lower and dismantle each hole cross-doorway steel pipe support separately, and is particularly suitable for the construction of high-grade highways with high requirements for crossing and maintaining traffic. It can ensure that vehicles crossing the road can still pass normally during the removal of the support, and is suitable for the removal of cast-in-place box girder portal steel pipe supports with large traffic pressure.

[0004] In order to realize the above technical features, the purpose of the present invention is realized as follows: a multi-hole cross-doorway steel pipe support quick dismantling device, comprising a strip foundation arranged on both sides and the central part of a two-way lane, a steel pile column is fixed on the top of the strip foundation, a load-bearing crossbeam is fixed on the top of the steel pipe column on the same side, a longitudinal beam is fixed across the top of the load-bearing crossbeam, and a bottom mold support system for supporting the bottom mold of the cast-in-place box beam is fixed on the top of the longitudinal beam; a plurality of fine-rolled threaded steel bars are arranged between the cast-in-place box beam and the load-bearing crossbeam, and the lower part of the fine-rolled threaded steel bars cooperates with the bottom end surface of the load-bearing crossbeam through a lower limiting structure; 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.

[0005] Preferably, oblique reinforcing rods are fixed between a plurality of steel pipe columns located at the top of the same strip foundation.

[0006] Preferably, a steel bar skeleton is provided inside the strip foundation and is cast with concrete; Preferably, the longitudinal beams and the load-bearing cross beams are respectively made of I-beams.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] Preferably, the lower nut and the upper nut each adopt a double nut structure.

[0011] Preferably, when the multi-hole door opening brackets need to be removed separately, an auxiliary load-bearing beam needs to be added to fix the upper structure of the steel pipe column of another hole.

[0012] 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: Step 1: Pass the fine-rolled threaded steel bar through the reserved holes of the cast-in-place box beam and the load-bearing crossbeam, and temporarily lock the upper and lower ends of the fine-rolled threaded steel bar with the middle nut and the lower nut; Step 2: Put four reaction seats on the four finished rolled threaded steel bars of the cast-in-place box girder that are about to be lowered, place through-type jacks on the reaction seats, and then place upper steel washers and upper nuts on the top of the through-type jacks; Step 3: Remove the steel pipe columns. At this time, the weight of the entire steel pipe support above the load-bearing crossbeam is transferred from the fine-rolled threaded steel to the cast-in-place box beam, completing the force conversion from support to support; Step 4: After the through-type jack is lifted to a certain stroke, the upper nut is tightened, and the middle nut inside the reaction seat is rotated upward while the through-type jack is slowly retracted. The entire steel pipe bracket and the precision-rolled threaded steel slowly descend under the action of their own weight as the jack retracts. After one stroke of retraction is completed, the middle nut inside the reaction seat is tightened, and the upper nut is rotated upward for one stroke. The through-type jack is then lifted to the upper nut under stress; Step 5: Repeat step 4 until the entire steel pipe support is lowered to the designated position; Step 6: Use machinery and manual labor to dismantle the formwork, square timber, distribution beam and bottom form support system, and finally dismantle the dismantling device to complete the dismantling of the steel pipe support across the hole; Step 7, repeat steps 1 to 6 to complete the removal of the remaining span steel pipe supports; Step 8: Remove the strip foundation and restore the road surface across the road.

[0013] When the steel pipe support is lowered in step 4, the upper structure of the adjacent span is fixed with a newly added auxiliary load-bearing beam to prevent the lowering of the existing middle load-bearing beam of the steel pipe column from affecting another span structure.

[0014] The present invention has the following beneficial effects: 1. The invention is simple 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.

[0015] 2. The temporary anchoring structure formed by the fine-rolled threaded steel and the I-beam in the present invention 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 passage. This structure is simple in form, easy to dismantle and convenient to operate.

[0016] 3. The present invention utilizes existing materials on site as unloading devices, eliminates the need for sand barrels, and directly arranges I-beams on the steel pipe columns, thereby effectively reducing construction costs while enhancing the integrity of the support system.

[0017] 4. The present invention adopts the method of first dismantling the steel pipe columns, and then lowering the cross 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

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a front schematic diagram of the dismantling arrangement of the doorway type steel pipe support of the present invention.

[0020] Figure 2 For the present invention Figure 1A partial enlarged view of the location of the middle support lowering mechanism.

[0021] Figure 3 It is a bar-shaped basic structure diagram of the present invention.

[0022] Figure 4 It is a side schematic diagram of the dismantling arrangement of the doorway type steel pipe support of the present invention.

[0023] Figure 5 For the present invention Figure 4 A partial enlarged view of the location of the middle support lowering mechanism.

[0024] Figure 6 For the present invention Figure 4 A partial enlarged view of the location of the auxiliary load-bearing beam in the middle.

[0025] 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; Steel reinforcement skeleton 1001. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0027] Embodiment 1: See also Figure 1-6 A multi-hole cross-doorway steel pipe support quick dismantling device comprises a strip foundation 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, a load-bearing crossbeam 8 is fixed on the top of the steel pipe column 9 on the same side, a longitudinal beam 7 is fixed across the top of the load-bearing crossbeam 8, and a bottom mold support system 11 for supporting the bottom mold of a cast-in-place box beam 6 is fixed on the top of the longitudinal beam 7; a plurality of fine-rolled threaded steel bars 1 are 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 cooperates with the bottom end surface of the load-bearing crossbeam 8 through a lower limiting structure; a support lowering mechanism for supporting the fine-rolled threaded steel bars 1 and being able to be alternately lowered is installed between the upper part of the fine-rolled threaded steel bars 1 and the top end surface of the cast-in-place box beam 6. The device is made of common materials and has a simple structure. It can lock, lower and remove each span portal steel pipe support separately, and is particularly suitable for the construction of high-grade highways with high requirements for cross-road traffic maintenance. It can ensure that vehicles crossing the road can still pass normally during the removal of the support, and is suitable for the removal of cast-in-place box girder portal steel pipe supports with heavy traffic pressure.

[0028] Furthermore, the length of the fine-rolled threaded steel bar 1 is determined by comprehensively considering the bridge height, the lifting height and the falling height, and the reserved holes are accurately positioned to ensure that the fine-rolled threaded steel bar 1 is installed vertically.

[0029] Furthermore, oblique reinforcing rods 16 are fixed between the plurality of steel pipe columns 9 located at the top of the same strip foundation 10. The oblique reinforcing rods 16 enhance the stability of the steel pipe columns 9.

[0030] Furthermore, a steel frame 1001 is provided inside the strip foundation 10 and is cast with concrete; Furthermore, the longitudinal beam 7 and the load-bearing cross beam 8 are respectively made of I-beams.

[0031] Furthermore, 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 bar 1, and the diameter of the reserved holes is larger than the diameter of the fine-rolled threaded steel bar 1. Thus, the fine-rolled threaded steel bar 1 can move a small distance on the plane.

[0032] Furthermore, the lower limiting structure includes a lower nut 14 installed at the lower part 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. The above-mentioned lower limiting structure ensures that the weight of the entire upper part of the load-bearing crossbeam 8 can be borne on the finely rolled threaded steel bar 1.

[0033] 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.

[0034] Furthermore, the lower nut 14 and the upper nut 2 both adopt a double nut structure, thereby ensuring the reliability of the support.

[0035] 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 pipe column 9. The above-mentioned auxiliary load-bearing crossbeam 12 ensures safety.

[0036] Embodiment 2: 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: 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; 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; Step 3: Remove the steel pipe 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; 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. Step 5: Repeat step 4 until the entire steel pipe support is lowered to the designated position; Step 6: Use machinery and manual labor to dismantle the formwork, square timber, distribution beam and bottom form support system 11, and finally dismantle the dismantling device to complete the dismantling of the hole span steel pipe support; Step 7, repeat steps 1 to 6 to complete the removal of the remaining span steel pipe supports; Step eight, dismantle the strip foundation 10 and restore the road surface across the road.

[0037] When the steel pipe support is lowered in step 4, the upper structure of the adjacent span is fixed with a newly added auxiliary load-bearing beam 12 to prevent the lowering of the existing middle load-bearing beam 8 of the steel pipe column 9 from affecting another span structure.

Claims

1. A multi-hole cross-doorway steel pipe support quick dismantling device, 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 pipe 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. According to claim 1, a multi-hole cross-doorway steel pipe support quick dismantling device is characterized by: Oblique reinforcing rods (16) are fixed between a plurality of steel pipe columns (9) located at the top of the same strip foundation (10).

3. According to claim 2, a multi-hole cross-doorway steel pipe support quick dismantling device is characterized by: 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. According to claim 1, a multi-hole cross-doorway steel pipe support quick dismantling device is characterized by: 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. According to claim 1, a multi-hole cross-doorway steel pipe support quick dismantling device is characterized by: 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. According to claim 5, a multi-hole cross-doorway steel pipe support quick dismantling device is characterized by: 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. According to claim 5, a multi-hole cross-doorway steel pipe support quick dismantling device is characterized by: The lower nut (14) and the upper nut (2) both adopt a double nut structure.

8. According to claim 7, a multi-hole cross-doorway steel pipe support quick dismantling device is characterized by: When the brackets of the multi-hole door opening need to be removed separately, an auxiliary load-bearing crossbeam (12) needs to be added to fix the upper structure of the steel pipe column (9) of another hole.

9. A method for quickly dismantling a porous cross-doorway steel pipe support, characterized in that: The dismantling method is implemented by using the dismantling device according to any one of claims 1 to 8, comprising the following steps: 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) using the middle nut (13) and the lower nut (14); 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) to be lowered, through-type jacks (4) are placed on the reaction seats (5), and upper steel washers (3) and upper nuts (2) are placed on the tops of the through-type jacks (4); Step 3, removing the steel pipe column (9), at which time the weight of the entire steel pipe support including the load-bearing crossbeam (8) 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; 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 by one stroke. The through-type jack (4) is lifted again until the upper nut (2) is stressed. Step 5: Repeat step 4 until the entire steel pipe support is lowered to the designated position; Step 6: Use machinery and manual labor to dismantle the formwork, square timber, distribution beam and bottom form support system (11), and finally dismantle the dismantling device to complete the dismantling of the steel pipe support across the hole; Step 7, repeat steps 1 to 6 to complete the removal of the remaining span steel pipe supports; Step 8: dismantle the strip foundation (10) and restore the road surface across the road.

10. A method for rapidly dismantling a multi-hole cross-doorway steel pipe support according to claim 9, characterized in that: When the steel pipe support is lowered in step 4, the upper structure of the adjacent span is fixed with a newly added auxiliary load-bearing crossbeam (12) to prevent the lowering of the existing middle load-bearing crossbeam (8) of the steel pipe column (9) from affecting the structure of another span.

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