Large-span prestressed beam prefabricated formwork

Abstract

The utility model relates to a large-span prestressed beam prefabricating formwork which comprises a bottom die, two vertically-distributed side dies are arranged on the two sides of the bottom die in the length direction of the bottom die respectively, a positioning support is arranged between the two side dies on the bottom die in the length direction of the bottom die, and a movable bayonet used for supporting a corrugated pipe and capable of adjusting the height is arranged on the positioning support. The positioning device has the advantages that the movable bayonet can move up and down on the positioning support to adjust the height, the elevation problem of the corrugated pipe at different positions is solved, accurate positioning of the curve position of the corrugated pipe is achieved, namely accurate positioning of the curve position of a prestressed tendon in the corrugated pipe is achieved, and therefore the construction quality of a prestressed beam is improved.

Description

Technical Field

[0001] This utility model relates to the field of construction technology for large-span prestressed beams, specifically to a precast formwork for large-span prestressed beams. Background Technology

[0002] With the rapid development of society, people's enthusiasm for sports is getting higher and higher. In order to meet the needs of the people, the demand for the construction of new venues in major cities is constantly increasing. At the same time, the shapes and structures of various venues are becoming more and more complex. The design of large-span prestressed beams provides the site requirements of large space and large span, but the construction difficulty also faces the engineers. Problems such as the occupation of non-prestressed steel bars and the requirements of prestressed tendon curves must be solved. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a precast formwork for large-span prestressed beams to overcome the shortcomings of the prior art.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0005] A precast formwork for a long-span prestressed beam includes: a bottom formwork, with a vertically distributed side formwork on each side of the bottom formwork along its length, and a positioning bracket arranged on the bottom formwork between the two side formworks along its length, the positioning bracket being provided with an adjustable latch for supporting the corrugated pipe.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, at least one bolt hole is made through the movable bayonet along the length of the bottom mold, and at least one adjustment hole is made through the positioning bracket along the length of the bottom mold. The adjustment holes are elongated and distributed along the height of the positioning bracket. The movable bayonet and the positioning bracket are fastened together with bolts, and the bolts pass through both the adjustment hole on the positioning bracket and the bolt hole on the movable bayonet.

[0008] Furthermore, the positioning bracket has two positioning frames distributed vertically, adjustment holes are opened on the positioning frames, and movable latches are fixed between the two positioning frames.

[0009] Furthermore, an adjustment hole is provided on each of the two positioning frames, and at least one adjustment hole is provided on each side of the movable bayonet.

[0010] Furthermore, two adjustment holes are provided on each side of the movable bayonet, and the movable bayonet is fastened to the positioning bracket with four bolts.

[0011] Furthermore, the adjustment hole is a waist-shaped hole.

[0012] Furthermore, the movable bayonet has an arc-shaped groove adapted to the corrugated pipe.

[0013] Furthermore, first rebar holes are opened on both side plates along the length of the positioning bracket, and the distance between the first rebar holes and the bottom formwork is the thickness of the rebar protective layer.

[0014] Furthermore, a second reinforcing bar hole is opened on each of the two side plates along its length on the positioning bracket. The first reinforcing bar hole on each side plate is located below the second reinforcing bar hole, and the distance between the second reinforcing bar hole and the first reinforcing bar hole is the distance between the upper and lower reinforcing bars as required by the specification.

[0015] The beneficial effects of this utility model are:

[0016] 1) The movable bayonet can move up and down on the positioning bracket to adjust the height, solve the elevation problem of the corrugated pipe at different positions, realize the precise positioning of the corrugated pipe curve position, and indirectly realize the precise positioning of the prestressed tendon curve position inside the corrugated pipe, thereby improving the construction quality of the prestressed beam.

[0017] 2) The distance between the first rebar hole on the positioning bracket and the bottom formwork is the thickness of the rebar protective layer, while the distance between the second rebar hole and the first rebar hole is the distance between the upper and lower rebars as required by the specifications. This solves the problems of the protective layer thickness of the lower rebar of the prestressed beam and the spacing between the upper and lower rebars, making the construction more standardized, more efficient, and of better quality.

[0018] 3) Improve the standardization of steel bar layout in prestressed beams, avoiding problems such as messy installation, misalignment, and low construction quality. The installation of prestressed tendons and non-prestressed tendons (upper and lower rows of steel bars) in prestressed beams is reliable, safe, and convenient, facilitating simultaneous construction in multiple areas and large areas. The overall construction cycle is short, the construction period is fast, the construction efficiency is high, the cost is saved, and the safety is high. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the precast formwork for the large-span prestressed beam described in this utility model;

[0020] Figure 2 This is an exploded view of the precast formwork for the large-span prestressed beam described in this utility model;

[0021] Figure 3 This is a structural diagram of a large-span prestressed beam.

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1. Bottom formwork, 2. Side formwork, 3. Positioning bracket, 310. Adjustment hole, 320. Positioning frame, 330. Side plate, 331. First rebar hole, 332. Second rebar hole, 4. Movable latch, 410. Bolt hole, 420. Arc groove, 5. Upper row of rebar, 6. Lower row of rebar, 7. Corrugated pipe. Detailed Implementation

[0024] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0025] Example 1

[0026] like Figure 1 , Figure 2 As shown, a precast formwork for a large-span prestressed beam includes: a bottom formwork 1, with two vertically distributed side forms 2 arranged on each side of the bottom formwork 1 along its length direction. A positioning bracket 3 is arranged on the bottom formwork 1 between the two side forms 2 along its length direction. The positioning bracket 3 is provided with a movable slot 4 for supporting a corrugated pipe 7. The movable slot 4 can be adjusted in height on the positioning bracket 3 according to the different curved layout positions of the corrugated pipe 7 so that the corrugated pipe 7 meets the prestressing tendon curve requirements. Subsequently, prestressing tendons are inserted into the corrugated pipe 7. Since the corrugated pipe 7 meets the prestressing tendon curve requirements, the prestressing tendons also meet the curve requirements.

[0027] Example 2

[0028] like Figure 1 , Figure 2 As shown, this embodiment is a further improvement on embodiment 1, as detailed below:

[0029] At least one bolt hole 410 is provided through the movable bayonet 4 along the length of the bottom mold 1, and at least one adjustment hole 310 is provided through the positioning bracket 3 along the length of the bottom mold 1. The adjustment holes 310 on the positioning bracket 3 are elongated and distributed along the height of the positioning bracket 3. The movable bayonet 4 and the positioning bracket 3 are fastened together by bolts (not shown in the figure). Specifically, the bolts pass through the adjustment holes 310 on the positioning bracket 3 and the bolt holes 410 on the movable bayonet 4 at the same time, and then are locked to achieve a fast connection between the movable bayonet 4 and the positioning bracket 3. During the adjustment process, the nut is loosened first, and after adjusting to the appropriate position, the nut is tightened to adjust the position of the movable bayonet 4.

[0030] Furthermore, the positioning bracket 3 has two vertically distributed positioning frames 320, with adjustment holes 310 opened on the positioning frames 320, and the movable bayonet 4 is fixed between the two positioning frames 320, which can effectively ensure the stability of the movable bayonet 4.

[0031] Each of the two positioning brackets 320 has an adjustment hole 310, and each side of the movable bayonet 4 has at least one adjustment hole 310. Preferably, each side of the movable bayonet 4 has two adjustment holes 310. In this case, the movable bayonet 4 has four adjustment holes 310. Therefore, the movable bayonet 4 and the positioning bracket 3 are fastened together by four bolts. The adjustment hole 310 is preferably an oblong hole.

[0032] Example 3

[0033] like Figure 1 , Figure 2 As shown, this embodiment is a further improvement on embodiment 1 or 2, as detailed below:

[0034] The movable bayonet 4 has an arc-shaped groove 420 adapted to the corrugated pipe. When the movable bayonet 4 supports the corrugated pipe 7, the corrugated pipe is located in the arc-shaped groove 420, which can prevent the corrugated pipe from shaking and improve stability.

[0035] Example 4

[0036] like Figure 1 , Figure 2 As shown, this embodiment is a further improvement on embodiment 1, 2, or 3, as detailed below:

[0037] The positioning bracket 3 has two side plates 330 along its length, each with a first rebar hole 331. The distance between the first rebar hole 331 and the bottom formwork 1 is equal to the thickness of the rebar protective layer. In addition, the positioning bracket 3 has two side plates 330 along its length, each with a second rebar hole 332. The first rebar hole 331 on each side plate 330 is located below the second rebar hole 332. The distance between the second rebar hole 332 and the first rebar hole 331 is equal to the distance between the upper row of rebars 5 and the lower row of rebars 6 as required by the specifications.

[0038] The prefabrication method for large-span prestressed beams, using the aforementioned prefabrication formwork, involves the following specific steps:

[0039] According to the design requirements of the drawings, position the beams and erect the formwork, adjust the height of the bottom formwork of the beams, and lay the bottom formwork 1.

[0040] Positioning bracket 3 is placed on bottom formwork 1, and the lower row of reinforcing bars 6 is inserted through the first reinforcing bar hole 331. Since the first reinforcing bar hole 331 on positioning bracket 3 has been made according to the requirements of protective layer thickness and reinforcing bar spacing, the distance between the lower row of reinforcing bars 6 (non-prestressed tendons) and bottom formwork 1 is the protective layer thickness requirement.

[0041] According to the requirements for the corrugated pipe curve layout, adjust the height of the movable clamp 4 so that it can support the corrugated pipe at the corresponding height, so that the corrugated pipe 7 meets the requirements for the prestressed tendon curve.

[0042] The upper row of reinforcing bars 5 is inserted through the second reinforcing bar hole 332. Since the distance between the second reinforcing bar hole 332 and the first reinforcing bar hole 331 has been opened according to the required distance between the upper row of reinforcing bars 5 and the lower row of reinforcing bars 6, the distance between the upper row of reinforcing bars 5 and the lower row of reinforcing bars 6 meets the specification requirements.

[0043] Install other reinforcing bars according to the drawing requirements to complete the reinforcement installation of the entire prestressed beam;

[0044] Check whether the prestressed beam reinforcement is installed according to the drawings. If it meets the requirements, close the side formwork. The reinforcement layout is complete, and concrete pouring and other processes can be carried out.

[0045] After the prestressing tendons and other concrete are poured, they are then inserted through corrugated pipe 7, such as... Figure 3 As shown.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A large-span prestressed beam prefabrication formwork, characterized in that, The utility model relates to a corrugated pipe positioning device, including: Bottom die (1), one vertical distribution side die (2) is arranged on both sides of bottom die (1) along its length direction, positioning support (3) is arranged between two side dies (2) along the length direction of bottom die (1), the movable clamp (4) for supporting corrugated pipe (7) and adjustable height is equipped on positioning support (3), at least one bolt hole (410) is opened through movable clamp (4) along the length direction of bottom die (1), at least one adjusting hole (310) is opened through positioning support (3) along the length direction of bottom die (1), adjusting hole (310) is long strip and is distributed along the height direction of positioning support (3), movable clamp (4) is connected with positioning support (3) using bolt fastening, the bolt is passed through adjusting hole (310) on positioning support (3) and bolt hole (410) on movable clamp (4) simultaneously.

2. The precast formwork for long-span prestressed beam according to claim 1, characterized in that, Positioning support (3) has two vertical distribution positioning racks (320), adjusting hole (310) is opened on positioning rack (320), movable clamp (4) is fixed between two positioning racks (320).

3. The precast formwork for long-span prestressed beam according to claim 2, characterized in that, One adjusting hole (310) is opened on two positioning racks (320), at least one adjusting hole (310) is opened on both sides of movable clamp (4).

4. The precast formwork for long-span prestressed beam according to claim 3, characterized in that, Two adjusting holes (310) are opened on both sides of movable clamp (4), movable clamp (4) is connected with positioning support (3) using four bolts fastening.

5. The precast formwork for long-span prestressed beam according to claim 4, characterized in that, Adjusting hole (310) is a waist type hole.

6. The precast formwork for long-span prestressed beam according to any one of claims 1-4, characterized in that, Movable clamp (4) has arc-shaped recess (420) that is adapted to corrugated pipe (7).

7. The precast formwork for long-span prestressed beam according to claim 1, wherein, First reinforcing bar hole (331) is opened on both side plates (330) of positioning support (3) along its length direction, and the spacing of first reinforcing bar hole (331) from bottom die (1) is the thickness of reinforcing bar protection layer.

8. The precast formwork for long-span prestressed beam according to claim 7, characterized in that, Second reinforcing bar hole (332) is opened on both side plates (330) of positioning support (3) along its length direction, first reinforcing bar hole (331) on each side plate (330) is located below second reinforcing bar hole (332), and the spacing of second reinforcing bar hole (332) from first reinforcing bar hole (331) is the spacing required by upper row reinforcing bar (5) and lower row reinforcing bar (6) according to specification.

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