A tension-compression combined support system and construction method for capping a hollow pier

Abstract

The invention discloses a tension-compression combined support system for capping a hollow pier, comprising a simply supported lifting frame steel beam bearing system, a tension-compression combined strong support system, a lifting formwork system, a limit system, a fine-tuning system, an anti-cracking system and an anti-leakage slurry system. When capping a hollow pier or a hollow tower using the construction method of the invention, manhole reservation can be avoided, and the number of reserved holes in the holes is greatly reduced. The lifting formwork system of the main load-bearing component is a permanent and temporary combination, which increases the safety of the structure, reduces construction joints and arranges steel reinforcement connections at the pier top joints. The tension-compression combined strong support system is an auxiliary force-bearing system, which reduces the amount of steel and avoids the tensile stress that the corbel may generate on the side wall concrete. The overall prefabrication and hoisting reduce aerial operations, thereby ensuring the safety of construction to the greatest extent.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a tension-compression combined support system and a construction method for capping a hollow pier. Background Art

[0002] With the development of bridge technology in my country, thin-walled hollow piers are increasingly used in bridge piers. However, the inherent problems of multiple seams on the top of thin-walled hollow piers, the danger of long-term high-altitude operations, and the impact of manhole reservations on structural performance during use have never been completely solved. At present, traditional construction methods and designs are helpless against the above problems. Summary of the invention

[0003] In order to overcome the technical defects of the prior art in the construction of thin-walled hollow piers, such as multiple joints on the pier top and long-term high-altitude operations, the present invention provides a tension-compression combined support system and construction method for capping the hollow pier, which solves the above technical problems.

[0004] The present invention achieves the above-mentioned purpose through the following technical scheme, a tension-compression combined support system for capping hollow piers, including a simply supported lifting frame steel beam bearing system, a tension-compression combined strong support system, a lifting formwork system, a limiting system, a fine-tuning system, an anti-cracking system and an anti-leakage slurry system.

[0005] The simply supported lifting frame steel beam bearing system includes side wall frame supporting I-beams and upper double-piece channel steels. The upper double-piece channel steels are erected above the side wall frame supporting I-beams on the left and right sides and are welded firmly.

[0006] The tension-compression combined strong support system includes oblique support I-beams, lower I-beams and upper I-beams. The lower I-beams are an integral structure at non-reserved holes and a disconnected structure at reserved holes, and the upper I-beams are welded at the top of the disconnected position. The lower I-beams and the side wall frame support I-beams are welded together through the oblique support I-beams.

[0007] The lifting formwork system includes a lower layer of double-jointed channel steel, tensioning screws, wooden squares, bamboo plywood and steel pads. The upper end of the lower layer of double-jointed channel steel is padded with wooden squares, the lower end is provided with steel pads, and the upper end of the wooden squares is provided with bamboo plywood. The tensioning screws pass through the lower layer of double-jointed channel steel, wooden squares, bamboo plywood and upper layer of double-jointed channel steel in sequence, and the two ends are locked by nuts. The contact positions of the nuts and the lower layer of double-jointed channel steel and the upper layer of double-jointed channel steel are padded with steel pads. The pre-arch degree is set by adjusting the position of the tensioning screw nut, and the tensioning screw is provided with a waterproof ring.

[0008] The limiting system includes fine-tuning bolts, a limiting steel plate and an I-beam flange plate sleeve. The I-beam flange plate sleeve is installed at the flange of the I-beam through the fine-tuning bolts, and a hole is punched at a set position before the I-beam is embedded. The limiting steel plate and the I-beam flange plate sleeve are vertically welded together.

[0009] The fine-tuning system is set on the oblique supporting I-beam and the tension screw. The height deviation of the tension-compression combined strong support system can be eliminated through the fine-tuning bolts, and the pre-arch of the upper double-jointed channel steel can be set, including the steel pad at the end of the bolt and the fine-tuning bolt. The fine-tuning bolt is installed on the I-beam, and the steel pad at the end of the bolt is placed on the fine-tuning bolt. By adjusting the screw-in length of the fine-tuning bolt on the I-beam, the position of the steel pad at the end of the bolt can be fine-tuned up and down, which can eliminate the deviation in the height direction of the embedded I-beam during construction.

[0010] The anti-cracking system includes a steel anti-cracking mesh and pull-out steel. The steel anti-cracking mesh is set on the top of the tension-compression combined strong support system, and the steel anti-cracking mesh is reinforced with pull-out steel.

[0011] The anti-leakage system includes thin steel sheets, oblique tensile reinforcements, concrete slots and double-sided tape. Concrete slots are set when pouring the side walls, and oblique tensile reinforcements are embedded as slot reinforcements. Double-sided tape is pasted on the contact position between the thin steel sheet and the bamboo plywood and the concrete slot position.

[0012] In the above-mentioned tension-compression combined support system for capping a hollow pier, the length of the side wall frame supporting I-beam is not less than 1m, and the position is within the range of 1 / 2 to 1 / 3 from the inner side.

[0013] In the above-mentioned tension-compression combined support system for capping a hollow pier, the thin steel sheet on the bamboo plywood is provided with an inverted U-shaped groove as a template sinking buffer groove.

[0014] In the above-mentioned tension-compression combined support system for capping a hollow pier, the I-beam flange plate sleeve can be cantilevered outward when the size of the upper I-beam is larger than that of the lower I-beam, and the cantilevered size is greater than 1 / 2 of the length of the lower I-beam flange plate.

[0015] During the construction of the "tension-compression combination" support system described in the present invention, the construction of the top of the thin-walled hollow pier is mainly completed through the following steps:

[0016] S1: When constructing the side wall of the thin-walled hollow pier, the pier top tension-compression combined strong support system is pre-buried and a thin-walled hollow anti-cracking system is added. Before pre-buried, the exposed part of the tension-compression combined strong support system is limited by a limit system, and a fine-tuning system is installed. The steel section is disconnected in the middle of the reserved hole position, and a thin steel sheet of the anti-leakage slurry system is installed;

[0017] S2: After the side wall meets the conditions for demolding, the operator removes the internal brackets and templates through the reserved holes of the tension-compression combined strong support system and transports them out;

[0018] S3: The reserved holes of the tension-compression combined strong support system are used to install the I-beams;

[0019] S4: I-beam distribution beams are installed on the top of the tension-compression combined strong support system, and the elevation deviation generated during the construction process is adjusted through the fine-tuning system;

[0020] S5: Assemble the lifting formwork system and the upper double-jointed channel steel on the ground, hoist the lifting formwork system and the upper double-jointed channel steel of the beam to the pier top as a whole and install them, and adjust the position of the nut on the tension screw to set the pre-camber;

[0021] S6: Reliably connect the thin steel sheet of the anti-leakage slurry system pre-buried at the chamfer of the thin-walled hollow pier with the bamboo plywood through double-sided tape and nails;

[0022] S7: One-time integral pouring construction of the top of the thin-walled hollow pier.

[0023] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0024] 1. The present invention discloses a tension-compression combined support system for capping a hollow pier. The top of a thin-walled hollow pier is cast in one piece, which saves construction time, reduces construction joints, and completely solves the adverse effects of construction joints on the structure. The main force is the lifting template system, and the tension-compression combined structure is only an auxiliary force. The side wall structure is subjected to a small tension force throughout the whole process, which prevents cracks in the cast side wall to the maximum extent. The connection between the construction joints of the pier columns is strengthened by a part of the support structure, thereby improving the structural performance. After the main force-bearing support is cast, the bottom of the capping structure is retained to form a permanent and temporary combination method, which greatly enhances the bottom rigidity and can reduce the amount of structural steel bars.

[0025] 2. During the specific construction, the construction method described in the present invention prefabricates and assembles the thin-walled hollow pier top lifting formwork on the ground, and hoists it as a whole to the pier top for installation, thereby reducing the difficulty of high-altitude construction, shortening the overall construction time, reasonably controlling the risk source, and ensuring construction safety to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0027] Figure 1 It is a schematic cross-sectional view of a tension-compression combined support system for capping a hollow pier according to the present invention, at a location other than a reserved hole;

[0028] Figure 2 It is a schematic cross-sectional view of a reserved hole of a tension-compression combined support system for capping a hollow pier according to the present invention;

[0029] Figure 3 It is a structural schematic diagram of the simply supported lifting frame steel beam bearing system of the present invention;

[0030] Figure 4It is a structural schematic diagram of the tension-compression combined strong support system of the present invention at the reserved hole;

[0031] Figure 5 It is a schematic diagram of the structure of the tension-compression combined strong support system of the present invention at a location other than a reserved hole;

[0032] Figure 6 It is a structural schematic diagram of the lifting template system of the present invention;

[0033] Figure 7 It is a structural schematic diagram of the limit system of the present invention;

[0034] Figure 8 It is a structural schematic diagram of the fine-tuning system of the present invention;

[0035] Fig. 9 It is a structural schematic diagram of the anti-cracking system of the present invention;

[0036] Fig.10 It is a structural schematic diagram of the slurry leakage prevention system of the present invention;

[0037] In the figure: 1-side wall frame supporting I-beam, 2-oblique supporting I-beam, 3-lower I-beam, 4-upper I-beam, 5-lower double-piece channel steel, 6-upper double-piece channel steel, 7-tension screw, 8-wooden square, 9-bamboo plywood, 10-steel pad, 11-fine-tuning bolt, 12-limiting steel plate, 13-I-beam flange plate sleeve, 14-bolt end steel pad, 15-steel anti-crack mesh, 16-pull-out steel, 17-thin steel sheet, 18-oblique tensile steel bar, 19-concrete slot, 20-double-sided tape. DETAILED DESCRIPTION

[0038] like Figure 1 and Figure 2 As shown, it is a schematic cross-sectional view of a tension-compression combined support system for capping hollow piers of the present invention at non-reserved holes and reserved holes, including a simply supported lifting frame steel beam bearing system, a tension-compression combined strong support system, a lifting formwork system, a limiting system, a fine-tuning system, an anti-cracking system and an anti-leakage slurry system.

[0039] like Figure 3 As shown, it is a structural schematic diagram of the simply supported lifting frame steel beam bearing system of the present invention, including a side wall frame supporting I-beam 1 and an upper double-layer channel steel 6. The upper double-layer channel steel 6 is erected above the side wall frame supporting I-beam 1 on the left and right sides and is firmly welded. The length of the side wall frame supporting I-beam 1 is not less than 1m, and the position is within the range of 1 / 2 to 1 / 3 from the inner side.

[0040] The tension-compression combined strong support system includes an oblique support I-beam 2, a lower I-beam 3 and an upper I-beam 4. The lower I-beam 3 is an integral structure at the non-reserved hole, such as Figure 4As shown, the reserved hole is in a disconnected structure, and an upper I-beam 4 is welded on the top of the disconnected position. Figure 5 As shown, the lower I-beam 3 and the side wall frame supporting I-beam 1 are welded together through the oblique supporting I-beam 2.

[0041] like Figure 6 As shown, it is a structural schematic diagram of the lifting formwork system of the present invention, including a lower double-jointed channel steel 5, a tensioning screw 7, a wooden square 8, a bamboo plywood 9 and a steel pad 10. The upper end of the lower double-jointed channel steel 4 is padded with a wooden square 8, and the lower end is provided with a steel pad 10. The upper end of the wooden square 8 is provided with a bamboo plywood 9. The tensioning screw 7 passes through the lower double-jointed channel steel 5, the wooden square 8, the bamboo plywood 9 and the upper double-jointed channel steel 6 in sequence, and the two ends are locked by nuts. The contact position between the nut and the lower double-jointed channel steel 4 and the upper double-jointed channel steel 6 is padded with a steel pad 10. The pre-arch degree is set by adjusting the position of the nut of the tensioning screw 7, and the tensioning screw 7 is provided with a waterproof ring.

[0042] like Figure 7 As shown, it is a schematic diagram of the structure of the limit system of the present invention, including fine-tuning bolts 11, limit steel plates 12 and I-beam flange plate sleeves 13. The I-beam flange plate sleeves 13 are installed at the flange of the I-beam through the fine-tuning bolts 11, and are punched at a set position before the I-beam is embedded. The limit steel plate 12 and the I-beam flange plate sleeves 13 are vertically welded together. When the size of the upper I-beam 4 is larger than that of the lower I-beam 3, the I-beam flange plate sleeves 13 can be cantilevered outward, and the cantilever size is greater than 1 / 2 of the length of the flange plate of the lower I-beam 3.

[0043] like Figure 8 As shown, it is a structural schematic diagram of the fine-tuning system of the present invention, the fine-tuning system is arranged on the oblique supporting I-beam 2 and the tension screw 7, the height deviation of the tension-compression combined strong support system can be eliminated by the fine-tuning bolt 11, and the pre-arch of the upper double-jointed channel steel 6 is set, including a bolt end steel pad 14 and a fine-tuning bolt 11, the fine-tuning bolt 11 is installed on the I-beam, and the bolt end steel pad 14 is padded on the fine-tuning bolt 11, by adjusting the screw-in length of the fine-tuning bolt 11 on the I-beam, the position of the bolt end steel pad 14 is fine-tuned up and down, and the deviation in the height direction of the embedded I-beam during construction can be eliminated.

[0044] like Fig. 9 As shown, it is a structural schematic diagram of the anti-cracking system of the present invention, including a steel anti-cracking mesh 15 and anti-pulling steel 16. The steel anti-cracking mesh 15 is arranged on the top of the tension-compression combined strong support system, and the anti-pulling steel 16 is used to reinforce the steel anti-cracking mesh 15.

[0045] like Fig.10As shown, it is a schematic diagram of the structure of the anti-leakage slurry system of the present invention, including a thin steel sheet 17, an oblique tensile reinforcement 18, a concrete slot 19 and a double-sided tape 20. The concrete slot 19 is set when the side wall is cast, and the oblique tensile reinforcement 18 is pre-embedded as a slot reinforcement. The contact position between the thin steel sheet 17 and the bamboo plywood 9 and the position of the concrete slot 19 are pasted with double-sided tape 20.

[0046] During the specific construction of this "tension-compression combination" support system, the construction of the top of the thin-walled hollow pier is mainly completed through the following steps:

[0047] Step 1: During the construction of the thin-walled hollow pier side wall, the pier top tension-compression combined strong support system is pre-buried and a thin-walled hollow anti-cracking system is added. Before pre-buried, the exposed part of the tension-compression combined strong support system is limited by a limit system, and a fine-tuning system is installed. The steel section is disconnected in the middle of the reserved hole position, and a thin steel sheet 17 of the anti-leakage slurry system is installed;

[0048] Step 2: After the side wall meets the conditions for demolding, the operator removes the internal brackets and templates through the reserved holes of the tension-compression combined strong support system and transports them out;

[0049] Step 3: Install the I-beam in the reserved holes of the tension-compression combined strong support system;

[0050] Step 4: Install the I-beam distribution beam on the upper part of the tension-compression combined strong support system and adjust the elevation deviation generated during the construction process through the fine-tuning system;

[0051] Step 5: Assemble the lifting formwork system and the upper double-jointed channel steel 6 on the ground, hoist the lifting formwork system and the upper double-jointed channel steel 6 of the crossbeam to the top of the pier as a whole and install them, and adjust the position of the nut on the tension screw 7 to set the pre-camber;

[0052] Step 6: Reliably connect the thin steel sheet 17 of the anti-leakage slurry system pre-buried at the chamfer of the thin-walled hollow pier and the bamboo plywood 9 through double-sided tape 20 and nails;

[0053] Step 7: One-time integral pouring construction of the top of the thin-walled hollow pier.

[0054] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tension-compression combined support system for capping a hollow pier, characterized in that: It includes a simply supported lifting frame steel beam bearing system, a tension-compression combined strong support system, a lifting formwork system, a limit system, a fine-tuning system, an anti-crack system and an anti-leakage slurry system; The simply supported lifting frame steel beam bearing system comprises a side wall frame supporting I-beam (1) and an upper double-jointed channel steel (6), wherein the upper double-jointed channel steel (6) is erected above the side wall frame supporting I-beam (1) on the left and right sides and is welded firmly; The tension-compression combined strong support system comprises an oblique support I-beam (2), a lower I-beam (3) and an upper I-beam (4); the lower I-beam (3) is an integral structure at a non-pre-reserved hole position and a disconnected structure at a pre-reserved hole position, and an upper I-beam (4) is welded to the top of the disconnected position; the lower I-beam (3) and the side wall frame support I-beam (1) are welded together via the oblique support I-beam (2); The lifting formwork system comprises a lower layer of double-jointed channel steel, a tensioning screw (7), a wooden square (8), a bamboo plywood (9) and a steel pad (10); the upper end of the lower layer of double-jointed channel steel is padded with a wooden square (8), and the lower end is provided with a steel pad (10); the upper end of the wooden square (8) is provided with a bamboo plywood (9); the tensioning screw (7) passes through the lower layer of double-jointed channel steel, the wooden square (8), the bamboo plywood (9) and the upper layer of double-jointed channel steel (6) in sequence, and the two ends are locked by nuts; the contact position between the nut and the lower layer of double-jointed channel steel and the upper layer of double-jointed channel steel (6) is padded with a steel pad (10); the pre-arch is set by adjusting the position of the nut of the tensioning screw (7); and the tensioning screw (7) is provided with a waterproof ring; The limiting system comprises a fine-tuning bolt (11), a limiting steel plate (12) and an I-beam flange plate clamp (13); the I-beam flange plate clamp (13) is installed at the flange of the I-beam through the fine-tuning bolt (11), and a hole is punched at a set position before the I-beam is embedded; the limiting steel plate (12) and the I-beam flange plate clamp (13) are vertically welded together; The fine-tuning system is arranged on the oblique supporting I-beam (2) and the tension screw rod (7). The height deviation of the tension-compression combined strong support system can be eliminated by the fine-tuning bolt (11), and the pre-arch of the upper double-jointed channel steel (6) is set. The fine-tuning system includes a bolt end steel pad (14) and a fine-tuning bolt (11). The fine-tuning bolt (11) is installed on the I-beam. The bolt end steel pad is arranged on the fine-tuning bolt (11). By adjusting the screw-in length of the fine-tuning bolt (11) on the I-beam, the position of the bolt end steel pad (14) is fine-tuned up and down, thereby eliminating the deviation in the height direction of the pre-buried I-beam during the construction process. The anti-cracking system comprises a steel bar anti-cracking net (15) and an anti-pulling steel section (16); the steel bar anti-cracking net (15) is arranged on the top of the tension-compression combined strong support system, and the anti-pulling steel section (16) is used to reinforce the steel bar anti-cracking net (15); The anti-leakage grout system comprises a thin steel sheet (17), oblique tensile reinforcement (18), a concrete slot (19) and a double-sided adhesive tape (20). The concrete slot (19) is provided when the side wall is cast, and the oblique tensile reinforcement (18) is pre-buried as a slot reinforcement. The contact position between the thin steel sheet (17) and the bamboo plywood (9) and the position of the concrete slot (19) are adhered with the double-sided adhesive tape (20).

2. A tension-compression combined support system for capping a hollow pier according to claim 1, characterized in that: The length of the I-beam (1) supported by the side wall frame is not less than 1 m.

3. A tension-compression combined support system for capping a hollow pier according to claim 1, characterized in that: The thin steel sheet (17) on the bamboo plywood (9) is provided with an inverted U-shaped groove, which serves as a template sinking buffer groove.

4. The tension-compression combined support system for capping a hollow pier according to claim 1, characterized in that: The I-beam flange plate clamping sleeve (13) can be cantilevered outward when the size of the upper I-beam (4) is larger than that of the lower I-beam (3), and the cantilevered size is greater than 1 / 2 of the length of the flange plate of the lower I-beam (3).

5. A construction method for a tension-compression combined support system for capping a hollow pier as claimed in claim 1, characterized in that ,The construction method includes the following construction steps: S1: During the construction of the thin-walled hollow pier side wall, the pier top tension-compression combined strong support system is pre-buried and a thin-walled hollow anti-cracking system is added. Before pre-buried, the exposed part of the tension-compression combined strong support system is limited by a limit system, and a fine-tuning system is installed. The steel section is disconnected in the middle at the reserved hole position, and a thin steel sheet (17) of the anti-leakage slurry system is installed; S2: After the side wall meets the conditions for demolding, the operator removes the internal brackets and templates through the reserved holes of the tension-compression combined strong support system and transports them out; S3: The reserved holes of the tension-compression combined strong support system are used to install the I-beams; S4: I-beam distribution beams are installed on the top of the tension-compression combined strong support system, and the elevation deviation generated during the construction process is adjusted through the fine-tuning system; S5: Assemble the lifting formwork system and the upper double-jointed channel steel (6) on the ground, hoist the lifting formwork system and the upper double-jointed channel steel (6) of the crossbeam as a whole to the pier top and install them, and adjust the position of the nut on the tension screw (7) to set the pre-camber; S6: Reliably connect the thin steel sheet (17) of the anti-leakage slurry system pre-buried at the chamfer of the thin-walled hollow pier and the bamboo plywood (9) by means of double-sided adhesive (20) and nails; S7: One-time integral pouring construction of the top of the thin-walled hollow pier.

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