Forming method of preformed hole of mass concrete prefabricated abutment

Abstract

The invention relates to the technical field of bridge construction, and discloses a forming method of a preformed hole of a mass concrete prefabricated abutment, which comprises the following steps of: binding vertical and circumferential steel bars around the position of the preformed hole; an outer fixing tray is horizontally placed at the bottom of the position where the preformed hole is preset; assembling a preformed hole template in advance, fixing the preformed hole template on the inner adjusting tray to form a pouring hole template, hoisting the pouring hole template to the top of the outer fixing tray, and adjusting the position of the preformed hole template from three dimensions; a steel bar connecting sleeve is inserted into the position of each steel bar penetrating hole, and axis steel bar penetrating and binding are conducted along the steel bar connecting sleeves; pouring concrete; the reinforcing steel bars in each reinforcing steel bar connecting sleeve are removed, and the reinforcing steel bar connecting sleeves are left in the concrete to form reinforcing steel bar connecting positions; and the preformed hole template, the outer fixing tray and the inner adjusting tray are removed and taken out, and a preformed hole is formed. The preformed hole forming efficiency is high, and the precision is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge construction, in particular to a forming method of a reserved hole of a mass concrete prefabricated pier. BACKGROUND

[0002] With the continuous record-breaking of bridge span and the repeated record-breaking of pier column height, mass concrete prefabricated components have become a "standard configuration". In order to balance quality and construction period, assembly type construction is fully developed, and assembly type components need to be hoisted to the site for assembly after being cast and formed in the prefabrication yard, and the prefabrication precision and construction quality are directly related to the safety and durability of the whole project.

[0003] The mass concrete prefabricated pier is a pier formed in a prefabrication yard, as shown in the figure. Figure 1 As shown in the figure, the split type pier needs to process a reserved hole b in the process of prefabricating the pier a, then the steel pipe composite pile d is connected with the lower part of the reserved hole b, then the upper part of the reserved hole b is connected through the connecting sleeve for connecting the steel bars, and the concrete is poured to complete the connection of the pier a and the steel pipe composite pile d.

[0004] The forming precision of the reserved hole directly affects the assembly precision between the steel pipe composite pile d, and the connecting sleeve for connecting the steel bars arranged on the upper part of the reserved hole b is coaxial and opposite to facilitate the steel bar penetration, the forming precision of the reserved hole in the prior art is poor, which directly leads to the difficulty of subsequent steel bar penetration and reduces the prefabrication efficiency of the pier. SUMMARY

[0005] The purpose of the present application is to provide a forming method of a reserved hole of a mass concrete prefabricated pier in order to solve the technical defects in the prior art.

[0006] The technical scheme adopted by the present application to achieve the purpose is as follows: A forming method of a reserved hole of a mass concrete prefabricated pier, comprising the following steps: Step 1: after the bottom steel bars of the pier are bound, vertical and ring-shaped steel bars are bound around the position where the reserved hole is preset; an outer fixed tray is horizontally placed at the bottom of the position where the reserved hole is preset; Step 2: the reserved hole template is assembled and formed in the template storage area in advance, the reserved hole template is fixed on the inner adjusting tray to form a pouring hole template; Step 3: the pouring hole template is hoisted to the top of the outer fixed tray, at this time the outer fixed tray supports the inner adjusting tray to adjust the position of the reserved hole template from three dimensions: The outer edge of the outer fixed tray is provided with a plurality of vertical counter-bolt legs, the height of the counter-bolt leg is adjusted to adjust the elevation of the reserved hole template, thereby adjusting the elevation of the reserved hole; The side wall of the outer fixed tray is provided with a plurality of horizontal adjustment bolts, and the horizontal adjustment bolts are used to accurately adjust the planar position of the reserved hole template. The side wall of the outer fixed tray and the inner adjustment tray is respectively provided with an outer adjustment hole and an inner adjustment hole, and the outer adjustment hole and the inner adjustment hole are matched with the crowbar to finely adjust the circumferential position of the inner adjustment tray, thereby adjusting the circumferential position of the reserved hole template. Step 4: The reserved hole template is provided with a layered arrangement of steel bar holes, and a steel bar connecting sleeve is inserted into each steel bar hole, and the steel bar is axially inserted into the steel bar connecting sleeve and is bound. Step 5: The concrete is poured outside the outer layer of the reserved hole template. Step 6: After the concrete in step 5 is finally cured, the steel bars inserted into each steel bar connecting sleeve in step 4 are removed to eliminate the constraint of the steel bars on the reserved hole template, and the steel bar connecting sleeve remains in the concrete to form a steel bar connecting position; the reserved hole template and the outer fixed tray and the inner adjustment tray are removed to form a reserved hole.

[0007] In the above technical solution, in step 2, a release agent is applied to the outside of the reserved hole template after the reserved hole template is assembled and formed.

[0008] In the above technical solution, in step 2, the reserved hole template includes four arc-shaped templates, a center support, a support rod, a bottom template, and a support base. When assembling, the arc-shaped templates are first fixed on the center support through the support rod, the arc-shaped templates are provided with steel bar holes for the steel bars to pass through, the four arc-shaped templates are fixed together to form a cylindrical structure template, then the cylindrical structure template is fixed on the bottom template, the bottom of the bottom template is fixed on the support base, and finally the center support is fixed on the top of the inner adjustment tray to obtain the reserved hole template.

[0009] In the above technical solution, in step 3, the elevation of the reserved hole template is measured by using a total station instrument, and the error is controlled within 3mm.

[0010] In the above technical solution, in step 4, the steel bar connecting sleeve is wrapped with a conical rubber sleeve.

[0011] In the above technical solution, in step 4, after the steel bar connecting sleeve is inserted, foam glue is applied between the steel bar connecting sleeve and the steel bar hole.

[0012] In the above technical solution, in step 5, when the concrete is poured, the concrete is first layered, vibrated and compacted at a fixed point, and then cured and maintained to form a shape.

[0013] In the above technical solution, the bottom of the inner annular bottom plate is provided with a support block to leave a gap between the inner adjustment tray and the outer fixed tray.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes an external fixed tray and an internal adjustable tray to adjust the position of the pre-drilled hole template from three dimensions, thereby precisely controlling the position of the pre-drilled hole, which facilitates subsequent assembly work and improves the processing efficiency and accuracy of large-volume precast concrete piers; 2. This invention is highly practical and operable, and can effectively ensure the horizontal matching concentricity of the rebar connection position in the reserved hole, which facilitates the horizontal matching concentricity of the subsequent rebar connection and realizes the precise positioning of the rebar connection between the pier and the steel pipe composite pile. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of a precast pier for a concrete bridge.

[0016] Figure 2 The diagram shows a structural schematic of an external fixed pallet supporting an internal adjustable pallet.

[0017] Figure 3 The diagram shows the positions of the outer fixed tray, the inner adjusting tray, and the pre-drilled hole template during the adjustment process.

[0018] Figure 4 This is a schematic diagram showing the location of the rebar connection sleeve in the reserved hole.

[0019] In the diagram: a-pier, b-reserved hole, c-reserved hole template, c1-reinforcing bar hole, c2-arc template, c3-central support, c4-support rod, c5-bottom template, c6-support base, d-steel pipe composite pile; 1-External fixed tray, 2-Inner adjusting tray, 3-Anti-top bolt support leg, 4-Horizontal adjusting bolt, 5-Rebar connecting sleeve; 1-1-External adjustment hole, 2-1-Internal adjustment hole, 2-2-Support block. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0021] Example 1 like Figures 2-4 As shown, a method for forming pre-reserved holes in large-volume precast concrete piers includes the following steps: Step 1: After the bottom reinforcement of pier a is tied, tie vertical and circumferential reinforcement around the position of the pre-reserved hole b; place the outer fixing tray 1 horizontally at the bottom of the position of the pre-reserved hole b. Step 2, the reserved hole template c is assembled in advance in the template storage area, release agent is applied outside the reserved hole template c for subsequent application, the reserved hole template c is fixed on the inner adjusting tray 2 to form a pouring hole template; Step 3, the pouring hole template is hoisted to the top of the outer fixed tray 1, at this time the outer fixed tray 1 supports the inner adjusting tray 2 to adjust the position of the reserved hole template c from three dimensions: The outer edge of the outer fixed tray 1 is provided with a plurality of vertical counter-bolt legs 3, by adjusting the height of the counter-bolt legs 3, the elevation of the reserved hole template c is adjusted, preferably, the elevation of the reserved hole template c is measured by a total station instrument, the error is controlled within 3mm, thereby adjusting the elevation of the reserved hole b; A plurality of horizontal adjusting bolts 4 are arranged on the side wall of the outer fixed tray 1, by adjusting the horizontal adjusting bolts 4, the planar position of the reserved hole template c is accurately adjusted, coordinate measurement is performed by a total station instrument, the error is controlled within 3mm; The outer adjusting hole 1-1 and the inner adjusting hole 2-1 are respectively arranged on the side wall of the outer fixed tray 1 and the inner adjusting tray 2, the outer adjusting hole 1-1 and the inner adjusting hole 2-1 cooperate with the crowbar to finely adjust the circumferential position of the inner adjusting tray 2, thereby adjusting the circumferential position of the reserved hole template c, and ensuring smooth later rebar penetration; As preferred, the bottom of the inner annular bottom plate 2-2 is provided with a support block 2-2 to leave a gap between the inner adjusting tray 2 and the outer fixed tray 1, thereby reducing the friction when adjusting the position of the inner adjusting tray 2 inside the outer fixed tray 1; Step 4, the plate surface of the reserved hole template c is provided with a layered rebar penetration hole c1, a rebar connecting sleeve 5 wrapped by a conical rubber sleeve is inserted into each rebar penetration hole c1, or a rebar connecting sleeve 5 is first inserted into the rebar penetration hole c1, then foam glue is punched between the rebar penetration hole c1 and the rebar connecting sleeve 5, and then the rebar connecting sleeve 5 is penetrated along the axis and tied; the conical rubber sleeve and the foam glue both have good mortar stopping effect, preventing concrete mud from entering the reserved hole b during later pouring; Step 5, concrete is layered and laid outside the outer layer of the reserved hole template c, and is fixed-point vibrated and compacted, and is formed by heat preservation, moisture preservation and curing; Step 6, after the concrete in step 5 is finally cured, the rebar inserted into each rebar connecting sleeve 5 in step 4 is removed to eliminate the constraint of the rebar on the reserved hole template c, the rebar connecting sleeve 5 remains in the concrete to form a rebar connecting position; the reserved hole template c and the outer fixed tray 1 and the inner adjusting tray 2 are removed to form the reserved hole b.

[0022] As Figure 4As shown, the inner wall of the reserved hole b is formed with a layered distribution of the reinforcing steel bar connecting sleeves 5, each layer of the reinforcing steel bar connecting sleeves 5 is annularly distributed, and the reserved hole b processed through the above steps can ensure that the opposite reinforcing steel bar connecting sleeves 5 in the same annular horizontal plane are coaxial, facilitating the subsequent butt joint of the reinforcing steel bars to match the concentricity, and improving the assembly efficiency and assembly accuracy of the prefabricated pier a of the concrete bridge and the steel pipe composite pile d.

[0023] Embodiment 2 This embodiment further illustrates the structure of the reserved hole template c on the basis of Embodiment 1.

[0024] The reserved hole template c includes four arc-shaped templates c2, a center support c3, a support rod c4, a bottom template c5, and a support base c6. When assembled, the arc-shaped templates c2 are first fixed on the center support c3 through the support rod c4, the arc-shaped templates c2 are provided with reinforcing steel bar passing holes c1 for the reinforcing steel bars to pass through, the four arc-shaped templates c2 are fixed together to form a cylindrical structure template, then the cylindrical structure template is fixed on the bottom template c5, the bottom of the bottom template c5 is fixed on the support base c6, and finally the center support c3 is fixed on the top of the inner adjusting tray 2 to obtain the pouring hole template.

[0025] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the protection scope of the present application.

Claims

1. A method for forming pre-reserved holes in large-volume precast concrete piers, characterized in that, Includes the following steps: Step 1: After the bottom reinforcement of the pier (a) is tied, tie vertical and circumferential reinforcement around the position of the pre-reserved hole (b); place the external fixing tray (1) horizontally at the bottom of the position of the pre-reserved hole (b). Step 2: Assemble the pre-drilled hole template (c) in advance in the template storage area, and fix the pre-drilled hole template (c) on the inner adjustment tray (2) to form the pouring hole template; Step 3: Hoist the gating hole template to the top of the outer fixed tray (1). At this time, the outer fixed tray (1) supports the inner adjusting tray (2) to adjust the position of the reserved hole template (c) from three dimensions: The outer edge of the external fixed tray (1) is provided with multiple vertical anti-top bolt legs (3). By adjusting the height of the anti-top bolt legs (3), the elevation of the reserved hole template (c) is adjusted, thereby adjusting the elevation of the reserved hole (b). The side wall of the external fixed tray (1) is provided with multiple horizontal adjusting bolts (4). By adjusting the horizontal adjusting bolts (4), the planar position of the reserved hole template (c) can be adjusted. The outer fixed tray (1) and the inner adjusting tray (2) are respectively provided with an outer adjusting hole (1-1) and an inner adjusting hole (2-1) on their side walls. The outer adjusting hole (1-1) and the inner adjusting hole (2-1) cooperate with the pry bar to adjust the circumferential position of the inner adjusting tray (2), thereby adjusting the circumferential position of the reserved hole template (c). Step 4: The surface of the pre-reserved hole template (c) is provided with layered through holes (c1). A rebar connector (5) is inserted at the position of each through hole (c1), and the rebar is axially threaded and tied along the rebar connector (5). Step 5: Pour concrete on the outer layer of the pre-drilled hole template (c); Step 6: After the concrete in Step 5 has set, remove the steel bars inserted into each steel bar connecting sleeve (5) in Step 4 to eliminate the constraint of the steel bars on the pre-reserved hole template (c). The steel bar connecting sleeve (5) remains in the concrete to form a steel bar connection position. Remove the pre-reserved hole template (c), as well as the outer fixed tray (1) and the inner adjusting tray (2) to take it out and form a pre-reserved hole (b).

2. The molding method as described in claim 1, characterized in that, In step 2, after the pre-drilled hole template (c) is assembled, a release agent is applied to the outside of the pre-drilled hole template (c).

3. The molding method as described in claim 1, characterized in that, In step 2, the pre-reserved hole template (c) includes four arc-shaped templates (c2), a central support (c3), a support rod (c4), a bottom template (c5), and a support base (c6). During assembly, the arc-shaped template (c2) is first fixed to the central support (c3) by the support rod (c4). The arc-shaped template (c2) is provided with a through hole (c1) for the reinforcing bar to pass through. The four arc-shaped templates (c2) are enclosed and fixed together to form a cylindrical template. Then, the cylindrical template is fixed to the bottom template (c5), and the bottom of the bottom template (c5) is fixed to the support base (c6). Finally, the central support (c3) is fixed to the top of the inner adjusting tray (2) to obtain the pouring hole template.

4. The molding method as described in claim 1, characterized in that, In step 3, the elevation of the pre-reserved hole template (c) is measured using a total station, with the error controlled within 3mm.

5. The molding method as described in claim 1, characterized in that, In step 4, the steel bar connecting sleeve (5) is wrapped with a conical rubber sleeve.

6. The molding method as described in claim 1, characterized in that, In step 4, after inserting the rebar connecting sleeve (5), foam adhesive is applied between the rebar connecting sleeve (5) and the through hole (c1).

7. The molding method as described in claim 1, characterized in that, In step 5, when pouring concrete, the concrete is first laid out in layers and compacted at fixed points, and then kept warm and moist for curing.

8. The molding method as described in claim 1, characterized in that, The bottom of the inner adjusting tray (2) is provided with a support block (2-2) so that there is a gap between the inner adjusting tray (2) and the outer fixed tray (1).

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