Construction method of bridge precast beam and slab wet joint

Abstract

The invention discloses a construction method of a bridge precast beam plate wet joint, which comprises the following steps: providing a plurality of split bolts, fixing metal sheets on the split bolts, and connecting pull ropes to the top ends and the bottom ends of the split bolts; mounting a bottom template, a primary keel and a secondary keel on the outer side of the end part of the precast beam plate and at the lower part of the opposite-pull screw rod, and sequentially sleeving an E-shaped clamp and a first nut; binding reinforcing steel bars and chiseling at the wet joints, and brushing a release agent on the bottom template; the bottom formwork is pulled to the position below the wet joint from the outer side of the end of the precast beam plate through a pull rope; an embedded sleeve is installed, the upper keel and a second nut are arranged in a sleeving mode, and after the bottom formwork is adjusted to be in place through a pull rope, the second nut is screwed down; wet joint concrete is poured, the upper keel and the second nut are removed, and the bottom formwork is removed through the pull rope; according to the method, the split bolt with the metal sheet and the pull rope is used for construction of the wet joint of the precast beam plate, and the problems that a wet joint bottom formwork is difficult to install and unclean to disassemble are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and particularly to a construction method for the wet joint of precast bridge beams and slabs. Background Art

[0002] During the construction of precast bridges in road municipal engineering, the wet joints of precast bridge beams and slabs generally use concrete with a higher grade, the same as or one grade higher than the strength grade of the precast bridge beams and slabs. Although a release agent is applied to the formwork of the wet joint concrete, especially in the construction of precast hollow beams or T-shaped beams, due to the small space and high height, and at the same time, the general function of a bridge is to cross obstacles, and the space below the bridge is limited, such as roads, rivers, etc., there are great difficulties in erecting the bottom formwork at the wet joint, which is not conducive to the operation; and when using traditional tie bolts, when removing the formwork, the bottom formwork of the wet joint will adhere to the wet joint and is difficult to remove completely. Summary of the Invention

[0003] The purpose of the present invention is to provide a construction method for the wet joint of precast bridge beams and slabs, so as to solve the problems in the prior art that there are great difficulties in erecting the bottom formwork at the wet joint, and the bottom formwork of the wet joint will adhere to the wet joint and is difficult to remove completely when removing the formwork.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A construction method for the wet joint of precast bridge beams and slabs, which includes the following steps:

[0006] Provide a plurality of tie bolts, fix metal sheets on the tie bolts, and connect pulling ropes to both the top and bottom ends of the tie bolts;

[0007] Install the bottom formwork of the wet joint below the lower part of the tie screw on the outer side of the end of the precast bridge beam and slab, and arrange main keels and secondary keels below the bottom formwork. The metal sheet is arranged on the upper surface of the bottom formwork, and a mountain-shaped clamp and a first nut are sequentially sleeved on the lower part of the tie screw. The mountain-shaped clamp is fixed below the two main keels through the first nut to fix the main keel, secondary keel and bottom formwork on the tie screw;

[0008] And after binding steel bars and roughening at the wet joint, apply a release agent to the bottom formwork;

[0009] Use the pulling rope at the top of the tie bolt to pull the main keel, secondary keel and bottom formwork from the outer side of the end of the precast bridge beam and slab to below the wet joint;

[0010] Install the embedded sleeve for the tie bolt, and the embedded sleeve is arranged on the metal sheet. An upper keel and a second nut are sleeved on the upper part of the tie bolt. The upper keel is arranged above the wet joint, and after adjusting the bottom formwork to closely adhere to the lower surface of the flange of the precast beam slab through the pull rope located above the tie bolt, tighten the second nut;

[0011] Pour the wet joint concrete, remove the upper keel and the second nut of the wet joint, and remove the bottom formwork by pulling the pull rope at the lower part of the tie bolt downward at both ends of the precast beam slab.

[0012] In some embodiments, the metal sheet is an iron sheet.

[0013] In some embodiments, the metal sheet is square or circular.

[0014] In some embodiments, the metal sheet is welded and fixed on the tie bolt.

[0015] In some embodiments, the upper keel is arranged above the wet joint through a wooden square.

[0016] In some embodiments, the upper keel is a steel pipe.

[0017] In some embodiments, the wet joint is constructed in sections along the length direction.

[0018] In some embodiments, the embedded sleeve is a plastic sleeve.

[0019] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0020] The present invention discloses a construction method for the wet joint of a bridge precast beam slab. By using a tie bolt with a metal sheet and a pull rope, the bottom formwork, main keel and secondary keel of the wet joint can be installed at the lower part of the tie bolt on the outer side of the end of the precast beam slab first, and then the main keel, secondary keel and bottom formwork can be pulled to the lower part of the wet joint from the outer side of the end of the precast beam slab by using the pull rope at the top of the tie bolt, thus solving the problems that the wet joint construction requires working at heights or on water, saving working hours and costs; and since the tie bolt and the bottom formwork can be disassembled together through the metal sheet, the problem that the bottom formwork of the wet joint cannot be disassembled cleanly is solved; at the same time, using this construction method for reinforcement at the wet joint also has the advantages of convenient and fast construction, saving construction costs, remarkable effects, and reducing the construction danger, and has a significant effect on the wet joint construction. Description of the Drawings

[0021] The present invention, its features, shape, and advantages will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. The same reference numerals indicate the same parts throughout all the drawings. The drawings are not necessarily drawn to scale, and the emphasis is on showing the gist of the present invention.

[0022] Figure 1 It is a construction schematic diagram of the wet joint of precast beam and slab of a bridge in an embodiment of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the tie bolt in an embodiment of the present invention;

[0024] Wherein, 1 - tie bolt; 2 - embedded casing; 3 - metal sheet; 4 - secondary keel; 5 - main keel; 6 - fixing ring; 7 - pulling rope; 8 - bottom formwork; 9 - U-shaped clamp; 10 - first nut; 11 - wooden square; 12 - second nut; 13 - upper keel. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] This embodiment discloses a construction method for the wet joint of precast beam and slab of a bridge. Specifically, the method includes the following steps:

[0027] Step S1, provide a plurality of tie bolts 1 (finished bolts can be used), and determine the diameter, length, etc. of the tie bolts 1 according to the concrete strength grade and thickness at the wet joint of the precast beam and slab; and fix metal sheets 3 on some or all of the tie bolts 1 according to the dimensions of the secondary and main keels 4 and the thickness of the bottom formwork 8, and connect pulling ropes 7 to the top and bottom ends of the tie bolts 1 through fixing rings 6.

[0028] Specifically, the metal sheet 3 is an iron sheet, with a square or circular shape, and the metal sheet 3 is welded and fixed on the tie bolt 1.

[0029] Step S2, install the bottom formwork 8 of the wet joint at the outside of the end of the precast beam slab, below the lower part of the tension tie bolts. (If metal sheets 3 are fixed on some of the tension tie bolts 1, then the tension tie bolts 1 with metal sheets 3 and those without metal sheets 3 are arranged at intervals along the length direction of the bottom formwork 8. The spacing between the tension tie bolts 1 with metal sheets 3 is generally 1000 mm, and the spacing between the tension tie bolts 1 without metal sheets 3 is generally 400 - 600 mm). And arrange the main keel 5 and the secondary keel 4 below the bottom formwork 8. The metal sheet 3 is arranged on the upper surface of the bottom formwork 8 (the metal sheet 3 is in close contact with the upper surface of the bottom formwork 8). And sequentially sleeve a cup head clamp 9 and a first nut 10 on the lower part of the tension tie bolts. The cup head clamp 9 is fixed below the two main keels 5 through the first nut 10 to fix the main keel 5, the secondary keel 4 and the bottom formwork 8 on the tension tie bolts 1.

[0030] Step S3, after binding the steel bars and roughening the surface at the wet joint, apply a release agent on the bottom formwork 8.

[0031] Step S4, use the pull rope 7 at the top end of the tension tie bolt 1 to pull the main keel 5, the secondary keel 4 and the bottom formwork 8 from the outside of the end of the precast beam slab to below the wet joint.

[0032] Step S5, install the embedded sleeve 2 of the tension tie bolt 1, and the embedded sleeve 2 is arranged on the metal sheet 3. And sleeve an upper keel 13 and a second nut 12 on the upper part of the tension tie bolt 1. And the upper keel 13 is supported above the wet joint through a wooden square 11. And after adjusting the bottom formwork 8 to be in close contact with the lower surface of the flange of the precast beam slab by using the pull rope 7 at the upper part of the tension tie bolt 1, tighten the second nut 12.

[0033] Specifically, the upper keel 13 is a steel pipe, and the above-mentioned embedded sleeve 2 is a plastic sleeve.

[0034] Step S6, pour the wet joint concrete, remove the upper keel 13 and the second nut 12 of the wet joint, and at both ends of the precast beam slab, pull down the pull rope 7 at the lower part of the tension tie bolt 1 to remove the bottom formwork 8.

[0035] Function of the metal sheet 3: Although the release agent is applied on the bottom formwork 8, there is still a phenomenon that the bottom formwork 8 adheres to the concrete. By using the metal sheet 3, the tension tie bolt 1 and the bottom formwork 8 are connected as a whole, which is beneficial to removing the adhered bottom formwork 8.

[0036] During the removal process of the bottom formwork 8, always pay attention to the falling positions of the tension tie bolt 1, the bottom formwork 8 and the main and secondary keels. When the positions deviate, use the pull rope 7 to adjust their positions; when the tension tie bolt 1, the bottom formwork 8 and the main and secondary keels fall into the water or on the road, use the pull rope 7 to pull them to the designated positions for removal or recycling.

[0037] In an embodiment of the present invention, the above wet joint can be constructed in segments along its length direction, so as to facilitate the segmented installation of the bottom formwork 8, enabling workers to easily pull the main keel 5, secondary keel 4, and bottom formwork 8 to the bottom of the wet joint from the outer side of the end of the precast beam slab by using the pulling rope 7 located at the top of the tie bolt 1.

[0038] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A construction method for wet joints of prefabricated bridge beams and slabs, characterized in that: The steps include: A plurality of tension bolts are provided, metal sheets are fixed on the tension bolts, and pull ropes are connected to the top and bottom ends of the tension bolts; A bottom template of a wet joint is installed at the lower part of the tension screw outside the end of the precast beam plate, and a main keel and a secondary keel are arranged below the bottom template, the metal sheet is arranged on the upper surface of the bottom template, and a mountain clamp and a first nut are sequentially sleeved on the lower part of the tension screw, and the mountain clamp is fixed to the lower part of the two main keels through the first nut, so that the main keel, the secondary keel and the bottom template are all fixed on the tension screw; After tying the steel bars and roughening the wet joints, apply a release agent on the bottom formwork; Use the pull rope on the top of the tension bolt to pull the main keel, secondary keel and bottom formwork from the outside of the end of the precast beam to the bottom of the wet joint; Install the embedded sleeve of the tension bolt, and the embedded sleeve is set on the metal sheet, and the upper keel and the second nut are sleeved on the upper part of the tension bolt, and the upper keel frame is set above the wet joint, and after adjusting the bottom template by the pull rope located on the upper part of the tension bolt until the bottom template is close to the lower surface of the flange of the precast beam plate, tighten the second nut; Pour wet joint concrete, remove the upper keel and the second nut of the wet joint, and remove the bottom formwork by pulling down the pull ropes at the lower parts of the tension bolts at both ends of the precast beam and slab.

2. The construction method of wet joints of precast bridge beams and slabs as claimed in claim 1, characterized in that: The metal sheet is an iron sheet.

3. The construction method of wet joints of precast bridge beams and slabs as claimed in claim 1, characterized in that: The metal sheet is square or circular.

4. The construction method of wet joints of precast bridge beams and slabs as claimed in claim 1, characterized in that: The metal sheet is welded and fixed on the tension bolt.

5. The construction method of wet joints of precast bridge beams and slabs as claimed in claim 1, characterized in that: The upper keel is erected above the wet joint through wooden planks.

6. The construction method of wet joints of precast bridge beams and slabs as claimed in claim 1, characterized in that: The upper keel is a steel pipe.

7. The construction method of wet joints of precast bridge beams and slabs as claimed in claim 1, characterized in that: The wet joint is constructed in sections along the length direction.

8. The construction method of wet joints of precast bridge beams and slabs as claimed in claim 1, characterized in that: The embedded sleeve is a plastic sleeve.

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