A construction method for ultra-high, ultra-thick and ultra-large span cap beam support

Abstract

The present application relates to the technical field of support installation of junction pier cap beams, and proposes a method for constructing super-high, super-thick, and super-large span cap beam support, including the following steps: S1: ground assembly of the support; S2: installing a traction mechanism for driving the support to rise and fall at the top of the pier column; S3: driving the traction mechanism to connect the distribution beam of the support; S4: driving the support to move up by the traction mechanism until the support is hoisted to the top of the pier column; S5: installing and fixing a plurality of brackets on the side opposite to the pier column and the distribution beam; S6: driving the support to move down by the top of the traction mechanism, so that the distribution beam of the support abuts against the top of the bracket; S7: disconnecting the connection between the traction mechanism and the support; S8: removing the traction mechanism. The present application has the effect of facilitating the construction of the cap beam bottom formwork support.

Description

Technical Field

[0001] The present application relates to the field of support installation of junction pier cap beam supports, and in particular to a construction method for an ultra-high, ultra-thick, and ultra-large-span cap beam support. Background Art

[0002] The junction pier of a large bridge includes two oppositely arranged piers and a cap beam cast between the two piers. In the related technology, before casting the cap beam, it is necessary to set up brackets around the two piers and between the two piers, so as to facilitate the subsequent support of the bottom formwork for casting the cap beam on the brackets. Before the bracket construction, it is necessary to set up a full-height floor-type scaffolding between the two piers before assembling the bracket on the floor-type scaffolding.

[0003] Due to design requirements, the two piers of the junction pier are far apart and the construction position of the cap beam is high; setting up a full-height ground-type scaffolding requires a large amount of pipes and has low disassembly and assembly efficiency, resulting in a long overall construction period of the cap beam. Summary of the invention

[0004] In order to make the installation of the bottom formwork support of the cap beam simpler and more convenient, the present application provides a construction method for an ultra-high, ultra-thick, and ultra-large-span cap beam support.

[0005] The present application provides a method for constructing an ultra-high, ultra-thick, ultra-large span cap beam support, which adopts the following technical solution:

[0006] A construction method for an ultra-high, ultra-thick, ultra-large span cap beam support comprises the following steps:

[0007] S1: Ground assembly of the support: Support the distribution beams on the opposite side of the two piers and the opposite side of the two piers respectively, and make both ends of the distribution beams extend out of the piers; fix a number of short-side Bailey beams on the distribution beam on the opposite side of the two piers; fix a number of long-side Bailey beams on the end of the distribution beam extending out of the piers;

[0008] S2: Installation and construction of traction mechanism: Install a traction mechanism on the top of the pier to drive the bracket to rise and fall;

[0009] S3: driving and connecting the traction mechanism to the distribution beam of the support;

[0010] S4: Support hoisting construction: the support is driven upward by the traction mechanism until the support is hoisted to the top of the pier;

[0011] S5: Corbel installation and construction: install and fix several corbels on the side opposite to the pier and the distribution beam;

[0012] S6: Support lowering construction: The support is moved downward by the top drive of the traction mechanism, so that the distribution beam of the support abuts against the top of the corbel;

[0013] S7: disconnect the traction mechanism from the bracket;

[0014] S8: Remove the traction mechanism.

[0015] By adopting the above technical solution, after the bracket is assembled on the ground, the assembled bracket is lifted to the top of the two piers through the traction mechanism. After the bracket is fixed on the outside of the pier, the bracket is driven downward by the traction mechanism until the distribution beam of the bracket abuts against the relative bracket, and the support of the bracket can be completed. Compared with the construction method of the traditional bracket, there is no need to construct a full-floor ground-type scaffolding first, which greatly reduces the waste of resources and improves the construction efficiency of the bracket; and the bracket can be assembled on the ground first and then lifted by the traction mechanism. There is no need to carry out bracket assembly construction work at high altitude, which improves the safety of construction, reduces the difficulty of construction, and makes the overall construction of the bracket simpler and more convenient.

[0016] Preferably, the traction mechanism comprises a plurality of support beams arranged in parallel, and through-type jacks are vertically mounted at both ends of the support beams;

[0017] In step S2, when installing the traction mechanism, both ends of the support beam are extended out of the pier column and the through-type jacks at both ends are respectively opposite to the distribution beams on both sides of the pier column;

[0018] In step S3, when connecting the traction mechanism to the distribution beam of the bracket, one end of the suspension rod is inserted into the through-type jack and the end of the suspension rod away from the through-type jack is fixed to the distribution beam.

[0019] By adopting the above technical solution, the bracket can be driven to rise and fall in the vertical direction by driving the suspension rod to rise and fall through the through-type jack, which is convenient for the overall lifting construction of the bracket.

[0020] Preferably, a plurality of reinforcing rods are tension-connected between adjacent support beams, and a plurality of embedded parts are arranged on the top of the pier column;

[0021] In step S2, when installing the traction mechanism, the reinforcing rod is fixed to the top end of the pier column through a plurality of embedded parts.

[0022] By adopting the above technical solution, the traction mechanism can be stably installed on the top of the pier column, and at the same time, it is convenient to improve the connection integrity and overall strength of adjacent support beams through reinforcing rods.

[0023] Preferably, the embedded part includes a fixing screw rod embedded and fixed at the top of the pier column, and the reinforcing rod is provided with a through hole for the fixing screw rod to pass through;

[0024] In step S2, when installing the traction mechanism, the reinforcing rod is sleeved on the corresponding fixing screw through the through hole and a locking nut is screwed into the top of the fixing screw and tightened.

[0025] By adopting the above technical solution, the traction mechanism can be detachably installed on the top of the pier. After the subsequent bracket is constructed, the locking nut is unscrewed and the traction mechanism is lifted from the top of the pier by a crane, which is convenient for the turnover of the traction mechanism.

[0026] Preferably, several corbels on opposite sides of the same pier are opposed to each other, and several tie rods are arranged between the two opposite corbels; the pier is pre-buried with several through-tubes for the tie rods to pass through corresponding to the several tie rods, and the corbels are provided with several through-holes corresponding to the several tie rods; the tie rods are passed through the pier through the through-tubes and both ends of the tie rods are respectively passed through the two opposite corbels through the through-holes, and both ends of the tie rods are threadedly connected with anchor nuts and the anchor nuts are tightly pressed against the corbels.

[0027] By adopting the above technical solution, in step S5, when installing the corbel, the tie rod is passed through the through-tube in the pier column and the tie rod is passed through the two opposite corbels through the through-holes respectively, and finally the anchor nuts are screwed into the ends of the tie rod and tightened, so that the corbel can be fastened to the column.

[0028] Preferably, the outer sides of the bottom ends of the corbels are all protruded with convex parts, and the piers are pre-buried with a number of slots for the convex parts to be inserted into corresponding to the corbels;

[0029] In step S5, when installing the corbel, the protruding portion of the corbel is inserted into the corresponding inserting groove.

[0030] By adopting the above technical solution, on the one hand, the corbel can be clamped on the pier to limit the downward movement of the corbel, so as to support the bracket more stably through the corbel; on the other hand, the subsequent load borne by the corbel can be transmitted to the plug-in groove through the protrusion and then transmitted to the pier through the plug-in groove, so as to improve the stress condition of the corbel.

[0031] Preferably, a plurality of inserting grooves on opposite sides of the same pier are opposed to each other, and a connecting rod is correspondingly connected between two opposite inserting grooves; the inserting grooves and the connecting rod are both welded and fixed to the internal steel bars of the pier.

[0032] By adopting the above technical scheme, through the setting of the connecting rod, on the one hand, it is convenient to improve the connection integrity of the two relative plug-in grooves through the connecting rod; at the same time, it is convenient to limit the two relative plug-in grooves through the connecting rod to ensure that the two relative plug-in grooves are at the same height after the casting of the rear pier is completed, so that after the protrusions of the two relative corbels are inserted into the corresponding plug-in grooves, the through holes on the two corbels can be opposite; the connecting rod and the plug-in groove are welded and fixed to the steel bars inside the pier, so as to reduce the displacement of the plug-in groove during the casting of the pier, and at the same time, the load applied to the corbel by the bracket can be better transmitted to the steel bars inside the pier through the plug-in groove.

[0033] Preferably, the connecting rod is vertically connected to the limiting plate, the limiting plate is provided with a plurality of limiting holes corresponding to a plurality of through-tubes, and the through-tubes are all passed through the corresponding limiting holes.

[0034] By adopting the above technical solution, when pre-embedded through-tubes, the through-tubes can be inserted into corresponding limiting holes on the limiting plates to limit the through-holes, thereby reducing displacement of the through-tubes during subsequent pier casting.

[0035] In summary, the present application includes at least one of the following beneficial technical effects:

[0036] 1. After the assembled bracket is hoisted to the top of the two piers by the traction mechanism, several brackets are installed and fixed on both sides of the piers, and then the bracket is driven downward by the traction mechanism until the bracket distribution beam abuts against several brackets. In this way, the bracket can be supported without setting up a full-floor scaffolding and assembling the bracket at high altitude, making the support of the cap beam bottom formwork bracket simpler and more convenient.

[0037] 2. A connecting rod is provided between the two relatively connected slots for pulling, so that the two relatively connected slots can be positioned by the connecting rod, so that the two relatively connected slots are located at the same height after the subsequent pier column casting, and the connection integrity of the two relatively connected slots can be improved by the connecting rod; the connecting rod and the slot are welded and fixed to the pier column steel bars, which is conducive to reducing the displacement of the two relatively connected slots during the pier column casting process.

[0038] 3. The limit plate is also vertically connected through the connecting rod. The limit plate is provided with a number of limit holes corresponding to the number of through-tubes. When the through-tubes are pre-buried, they can be inserted into the corresponding limit holes to limit the through-tubes and reduce the displacement of the through-tubes during the pouring of the piers. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram used in an embodiment of the present application to illustrate the process of hoisting a bracket through a traction mechanism.

[0040] Figure 2 It is a schematic diagram of the embodiment of the present application after the support construction is completed.

[0041] Figure 3 yes Figure 2 Enlarged schematic diagram of part A in the middle.

[0042] Figure 4 This is a schematic diagram of the internal structure of the pier used in the embodiment of the present application.

[0043] Description of reference numerals:

[0044] 1. Pier; 2. Bracket; 21. Distribution beam; 22. Short-side Bailey beam; 23. Long-side Bailey beam; 3. Traction mechanism; 31. Support beam; 32. Through-type jack; 33. Reinforcement rod; 4. Hanging rod; 5. Corbel; 50. Protrusion; 51. Pull rod; 52. Anchor nut; 53. Through-tube; 6. Plug groove; 61. Connecting rod; 62. Limit plate. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-4 This application is described in further detail.

[0046] The present application discloses a method for constructing an ultra-high, ultra-thick, ultra-large span cap beam support. Figure 1 and Figure 2 , including the following steps:

[0047] S1: Bracket 2 ground assembly construction: The specific steps are as follows:

[0048] S1.1: Supporting the distribution beam 21: Install welding frames on the opposite sides of the two piers 1 and the opposite sides of the two piers 1 respectively; hoist the distribution beam 21 onto the welding frames; make both ends of the distribution beam 21 extend out of the piers; temporarily weld and fix the distribution beam 21 on the frames;

[0049] S1.2: Weld and fix a plurality of short-side Bailey beams 22 on the distribution beams 21 on the opposite sides of the two piers 1;

[0050] S1.3: A plurality of long-side Bailey beams 23 are welded to one end of the distribution beam 21 extending out of the pier.

[0051] The distribution beam 21, the long side Bailey beam 23 and the short side Bailey beam 22 are all welded by carbon dioxide gas shielded welding. During welding, the welding process parameters set by the welding process are strictly followed to prevent burn-through and reduce welding deformation. Temporary rigid fixation is added during welding to control welding deformation.

[0052] S2: Installation and construction of the traction mechanism 3: The traction mechanism 3 for driving the bracket 2 to rise and fall is installed and fixed on the top of the pier 1.

[0053] The traction mechanism 3 includes two oppositely arranged support beams 31, and through-type jacks 32 are vertically installed at both ends of the support beams 31; a plurality of reinforcing rods 33 are connected to each other in tension between the two groups of support beams 31; a plurality of embedded parts are pre-embedded at the top of the pier 1, and the embedded parts include fixed screws vertically arranged at the top of the pier 1; a plurality of through holes are opened in the reinforcing rod 33 corresponding to the fixed screws; when installing and fixing the traction mechanism 3, the reinforcing rod 33 is fixed to the top of the pier 1 through the embedded parts, and the specific steps are as follows:

[0054] S2.1: hoist the traction mechanism 3 to the top of the pier 1 by a crane;

[0055] S2.2: The reinforcing rod 33 is sleeved on the fixing screw rod through the through hole, so that both ends of the support beam 31 extend out of the pier 1 and the through-type jacks 32 at both ends of the support beam 31 are respectively opposite to the distribution beams 21 on the opposite sides of the pier 1;

[0056] S2.3: Screw the two sets of fixing nuts into the top of the fixing screw in sequence and tighten them.

[0057] Through the above arrangement, on the one hand, the traction mechanism 3 can be stably installed on the top of the pier column 1 , and on the other hand, after the subsequent support construction is completed, the traction mechanism 3 can be removed from the top of the pier column 1 to facilitate the turnover of the traction mechanism 3 .

[0058] S3: driving and connecting the traction mechanism 3 to the distribution beam 21 of the bracket 2; the specific steps are as follows:

[0059] S3.1: Disconnect the distribution beam 21 from the tire frame;

[0060] S3.2: Drill holes on the distribution beam 21 for the suspension rod 4 to pass through; pass the suspension rod 4 through the holes on the through-type jack 32 and the distribution beam 21 in sequence, and screw two sets of locking nuts into the bottom end of the suspension rod 4;

[0061] S3.3: Pre-tighten the suspension rod 4 by using a through-type jack 32 with low oil pressure until the locking nut is pressed against the lower surface of the distribution beam 21, so that the suspension rod 4 is evenly stressed.

[0062] Through the above steps, the through-type jack 32 and the distribution beam 21 are driven and connected by the suspension rod 4 .

[0063] S4: Construction of hoisting support 2: Drive support 2 upward through traction mechanism 3 until support 2 is hoisted to the top of pier 1; specific steps are as follows: Drive corresponding suspension rod 4 upward through through-type jack 32 to drive support 2 upward; When suspension rod 4 rises 2m, gas cutting is used to cut off the top of suspension rod 4, so that the top of suspension rod 4 does not exceed 0.3m beyond the top of through-type jack 32.

[0064] S5: Installation and construction of bracket 5: refer to Figure 2 and Figure 3 A plurality of brackets 5 are installed and fixed on the side of the pier 1 opposite to the distribution beam 21.

[0065] Reference Figure 3 and Figure 4The corbels 5 on opposite sides of the same pier 1 are opposite to each other, and a plurality of tie rods 51 are arranged between the two opposite corbels 5. The corbels 5 are provided with through holes for the tie rods 51 to pass through corresponding to the tie rods 51. The pier 1 is pre-buried with a plurality of through-tubes 53 for the tie rods 51 to pass through corresponding to the tie rods 51. In this embodiment, the through-tubes 53 are PVC tubes. The tie rods 51 are passed through the pier 1 through the through-tubes 53, and the two ends of the tie rods 51 are respectively passed through the two opposite corbels 5 through the through holes. The two ends of the tie rods 51 are threadedly connected with anchor nuts 52, and the anchor nuts 52 are tightly pressed against the corbels 5, so as to fix the two opposite corbels 5 on the opposite sides of the pier 1.

[0066] A protruding portion 50 is protruding from the bottom of the corbel 5; a plurality of plug-in grooves 6 are pre-embedded and fixed to the pier 1 corresponding to the plurality of corbels 5; when installing the corbel 5, the protruding portion 50 of the corbel 5 can be inserted into the corresponding plug-in groove 6, so that the load on the corbel 5 can be transferred to the plug-in groove 6 through the protruding portion 50 and then transferred to the pier 1 via the plug-in groove 6, which is beneficial to improving the stress condition of the corbel 5 and reducing the load concentration on the pull rod 51 of the corbel 5.

[0067] The plurality of plug-in slots 6 on opposite sides of the same pier 1 are opposite to each other, and a connecting rod 61 is connected between the opposite plug-in slots 6, so that the two opposite plug-in slots 6 can be positioned by the connecting rod 61, so that after the subsequent pouring of the pier 1, the two opposite plug-in slots 6 are at the same height. At the same time, the connection integrity of the two opposite plug-in slots 6 can be improved by the connecting rod 61. The groove wall at the bottom of the plug-in slot 6 is provided with a plurality of vents. Through the provision of the vents, when the concrete of the pier 1 is poured later, the bubbles generated by vibration can be discharged through the vents, thereby reducing the occurrence of holes in the concrete at the bottom of the subsequent plug-in slot 6.

[0068] A limiting plate 62 is also vertically connected to the connecting rod 61. The limiting plate 62 is provided with a plurality of limiting holes corresponding to the plurality of through-tubes 53. The plurality of through-tubes 53 are respectively inserted into the corresponding limiting holes. Through the above arrangement, the plurality of through-tubes 53 can be limited and fixed by the limiting plate 62, thereby reducing the displacement of the through-tubes 53 during the subsequent pouring of concrete for the pier column 1.

[0069] The plug-in slot 6, connecting rod 61 and limiting plate 62 are all welded and fixed to the steel bars inside the pier 1. On the one hand, this can reduce the displacement of the plug-in slot 6, connecting rod 61 and limiting plate 62 when the pier 1 is cast. On the other hand, the subsequent loads on the plug-in slot 6, connecting rod 61 and limiting plate 62 can be transmitted to the steel bars inside the pier 1 in time.

[0070] The specific steps of step S5 are as follows:

[0071] S5.1: insert the pull rod 51 into the corresponding through-tube 53;

[0072] S5.2: Move the two opposite corbels 5 so that the protruding parts 50 of the corbels 5 are inserted into the corresponding insertion grooves 6; at the same time, the two opposite corbels 5 are respectively sleeved on the two ends of the pull rod 51 through the perforations;

[0073] S5.3: Screw the anchor nuts 52 into the ends of the pull rod 51 respectively and make them press against the corresponding bracket 5 tightly.

[0074] S6: Construction of lowering the support 2: The support 2 is moved downward by the traction mechanism 3, so that the distribution beam 21 of the support 2 is pressed against the tops of the corresponding corbels 5.

[0075] S7: disconnect the traction mechanism 3 from the bracket 2; the specific steps are as follows: remove the locking nut at the bottom end of the suspension rod 4 and remove the suspension rod 4 from the through-type jack 32 and the distribution beam 21.

[0076] S8: Dismantle the traction mechanism 3. The specific steps are as follows:

[0077] S8.1: Remove the retaining nut at the top of the retaining screw;

[0078] S8.2: Lift the traction mechanism 3 off the top of the pier 1 by means of a crane.

[0079] In the present application, after the bracket 2 is assembled on the ground, the bracket 2 is first hoisted to the top of the pier 1 through the traction mechanism 3 on the top of the pier 1. After the bracket 5 is installed, it is driven by the traction mechanism 3. On the one hand, there is no need to set up a full-height ground-type scaffolding for supporting the bracket 2; at the same time, the bracket 2 can be assembled on the ground first and then hoisted, and there is no need to assemble the bracket 2 at high altitude, which makes the assembly of the bracket 2 simpler and more convenient.

[0080] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A construction method for an ultra-high, ultra-thick, ultra-large span cap beam support, characterized in that: The following steps are involved: S1: Ground assembly construction of the support (2): a distribution beam (21) is respectively supported on one side opposite to the two piers (1) and on the opposite side to the two piers (1), and both ends of the distribution beam (21) are extended out of the piers (1); a plurality of short-side Bailey beams (22) are fixed on the distribution beam (21) on the side opposite to the two piers (1); and a plurality of long-side Bailey beams (23) are fixed on the end of the distribution beam (21) extending out of the piers; S2: Installation and construction of the traction mechanism (3): A traction mechanism (3) for driving the bracket (2) to rise and fall is installed on the top of the pier (1); The traction mechanism (3) comprises a plurality of support beams (31) arranged in parallel, and through-type jacks (32) are vertically installed at both ends of the support beams (31); when the traction mechanism (3) is installed, both ends of the support beams (31) are extended out of the pier column (1) and the through-type jacks (32) at both ends are respectively opposite to the distribution beams (21) on both sides of the pier column (1); S3: driving and connecting the traction mechanism (3) and the distribution beam (21) of the support (2); when connecting the traction mechanism (3) and the distribution beam (21) of the support (2), inserting one end of the suspension rod (4) into the through-type jack (32) and fixing the end of the suspension rod (4) away from the through-type jack (32) on the distribution beam (21); S4: Construction of hoisting the support (2): driving the support (2) upward by means of the traction mechanism (3) until the support (2) is hoisted to the top of the pier (1); S5: Installation and construction of the corbels (5): a plurality of corbels (5) are installed and fixed on the side of the pier (1) opposite to the distribution beam (21); the corbels (5) on the opposite sides of the same pier (1) are opposite to each other, and a plurality of tie rods (51) are arranged between the two opposite corbels (5); the pier (1) is pre-buried with a plurality of through-tubes (53) for the tie rods (51) to pass through corresponding to the tie rods (51), and the corbels (5) are provided with a plurality of through-holes corresponding to the tie rods (51); the tie rods (51) are passed through the pier (1) through the through-tubes (53), and the two ends of the tie rods (51) are respectively passed through the two opposite corbels (5) through the through-holes, and the two ends of the tie rods (51) are threadedly connected with anchor nuts (52), and the anchor nuts (52) are tightly pressed against the corbels (5); S6: Construction of lowering the support (2): driving the support (2) downward by the traction mechanism (3), so that the distribution beam (21) of the support (2) abuts against the top of the corbel (5); S7: disconnecting the traction mechanism (3) from the bracket (2); S8: Remove the traction mechanism (3).

2. The method for constructing an ultra-high, ultra-thick, ultra-large span cap beam support according to claim 1, characterized in that: A plurality of reinforcing rods (33) are tension-connected between adjacent support beams (31), and a plurality of embedded parts are arranged at the top of the pier column (1); In step S2, when installing the traction mechanism (3), the reinforcing rod (33) is fixed to the top end of the pier column (1) through a plurality of embedded parts.

3. The method for constructing an ultra-high, ultra-thick, ultra-large span cap beam support according to claim 2, characterized in that: The embedded part comprises a fixing screw rod embedded and fixed at the top of the pier column (1), and the reinforcing rod (33) is provided with a through hole for the fixing screw rod to pass through; In step S2, when installing the traction mechanism (3), the reinforcing rod (33) is sleeved on the corresponding fixing screw through the through hole and a locking nut is screwed into the top of the fixing screw and tightened.

4. The method for constructing an ultra-high, ultra-thick, ultra-large span cap beam support according to claim 1, characterized in that: The outer sides of the bottom ends of the corbels (5) are all protruded with convex parts (50), and the pier column (1) is pre-buried with a plurality of insertion grooves (6) for the convex parts (50) to be inserted into corresponding to the plurality of corbels (5); In step S5, when installing the corbel (5), the raised portion (50) of the corbel (5) is inserted into the corresponding insertion groove (6).

5. The method for constructing an ultra-high, ultra-thick, ultra-large span cap beam support according to claim 4, characterized in that: A plurality of inserting grooves (6) are arranged on opposite sides of the same pier column (1), and a connecting rod (61) is connected between two opposite inserting grooves (6); the inserting grooves (6) and the connecting rod (61) are welded and fixed to the internal steel bars of the pier column (1).

6. The method for constructing an ultra-high, ultra-thick, ultra-large span cap beam support according to claim 5, characterized in that: The connecting rod (61) is vertically connected to the limiting plate (62), and the limiting plate (62) is provided with a plurality of limiting holes corresponding to a plurality of through-tubes (53), and the through-tubes (53) are all passed through the corresponding limiting holes.

Images