Inverted arch cushion concrete curved surface slicking device

Abstract

The utility model relates to an inverted arch cushion concrete curved surface slicking device which comprises an arch truss piece and two parallel guide rails, the arch truss piece comprises a cross rod and an arc-shaped scraping rod, the arc-shaped scraping rod is located below the cross rod, the outer arc surface of the arc-shaped scraping rod faces downwards, a plurality of web members are welded between the inner arc surface of the arc-shaped scraping rod and the cross rod, and the guide rails are connected with the web members. The radian of the arc-shaped scraping rod is consistent with the designed radian of the inverted arch cushion layer, the two ends of the cross rod are each provided with a roller, and a U-shaped pull rod is welded to one side of the cross rod in the direction perpendicular to the plane of the arch frame piece. Each guide rail comprises channel steel with an upward notch, jacks are vertically arranged at the bottoms of the two ends of the channel steel respectively, and rollers at the two ends of the cross rod are supported in the notches of the channel steel of the two guide rails respectively and can longitudinally roll along the channel steel. According to the utility model, the surface of the inverted arch cushion concrete curve can be scraped, and the construction quality of the inverted arch cushion is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of highway tunnel construction, relates to tunnel invert construction, and specifically relates to a device for scraping and leveling the curved surface of invert cushion concrete. Background Art

[0002] The highway tunnel invert is a reverse arch structure set at the bottom of the tunnel to improve the stress conditions of the tunnel superstructure. It is used to effectively transfer the tunnel upper stratum pressure and vehicle load borne by the arch ring to the stratum below the invert. It is generally set under the IV and V grade surrounding rock conditions of highway tunnels.

[0003] In order to evenly transfer the load borne by the inverted arch to the stratum, a 15-20cm thick concrete cushion is generally set under the inverted arch. The surface curvature of the inverted arch cushion should be consistent with the curvature of the bottom surface of the inverted arch, and the cushion surface should be kept as flat as possible, because for cast-in-place concrete inverted arches, the flatness of the curved surface of the cushion is convenient for the binding construction of the reinforcement in the inverted arch and the precise control of the thickness of the steel bar protective layer. For assembled inverted arches, the flatness of the curved surface of the cushion is conducive to the close fit between the inverted arch prefabricated block and the cushion, ensuring the installation accuracy and stability of the inverted arch prefabricated block.

[0004] At present, during the construction of the invert cushion layer, mechanical paving is often used after the concrete is poured. However, since the surface of the concrete is a downward concave curved surface and the concrete has a certain fluidity before initial setting, it is not easy to achieve the required accuracy after paving and further scraping is required.

[0005] In the prior art, CN220285267 U discloses a concave concrete surface overlap scraper, with an ear plate vertically welded at both ends of the scraper, and the two ear plates are respectively connected to a hollow sleeve, each hollow sleeve is rotatably connected to a handle, when in use, the scraper is placed on the concrete surface to be leveled, and the two hollow sleeves are respectively supported on an existing reference plane higher than the concrete to be leveled, and two construction workers respectively hold the handles to push the scraper to level the concrete surface. However, this device is not suitable for leveling the curved surface of the tunnel invert cushion concrete, mainly because the two sides of the invert cushion concrete do not have a hard reference surface to support the hollow sleeve, and in addition, the space on both sides of the invert cushion in the tunnel is limited, which makes it inconvenient for construction workers to walk. Summary of the invention

[0006] The utility model aims to solve the above problems and provides a device suitable for flattening the curved surface of the concrete of the invert cushion.

[0007] The technical solution of the utility model is as follows:

[0008] A device for scraping the curved surface of concrete of an inverted arch cushion layer, characterized in that it comprises an arch truss piece and two parallel guide rails; the arch truss piece comprises a cross bar and an arc scraper, the arc scraper is located below the cross bar, the outer arc surface of the arc scraper faces downward, a plurality of webs are welded between the inner arc surface of the arc scraper and the cross bar, the curvature of the arc scraper is consistent with the designed curvature of the inverted arch cushion layer, a roller is respectively arranged at both ends of the cross bar, and a U-shaped pull rod is welded on one side of the cross bar in a direction perpendicular to the plane of the arch truss piece; each guide rail comprises a channel steel with a notch facing upward, a jack is vertically arranged at the bottom of both ends of the channel steel, and the upper end of the piston rod of the jack is welded to the cross bar; the rollers at both ends of the cross bar are respectively supported in the notches of the channel steel of the two guide rails and can roll longitudinally along the channel steel.

[0009] The utility model has the advantages of simple structure and convenient operation. By mechanically or manually dragging the arch truss to move on the top surface of the inverted arch cushion concrete, the surface of the inverted arch cushion concrete can be scraped flat, the thickness of the cushion concrete can be accurately controlled, and the construction quality of the inverted arch cushion can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0011] like Figure 1 As shown, the utility model comprises an arch truss piece and two parallel guide rails; the arch truss piece comprises a cross bar 1 and an arc scraper 2, the arc scraper 2 is located below the cross bar 1, the outer arc surface of the arc scraper 2 faces downward, a plurality of webs 3 are welded between the inner arc surface of the arc scraper 2 and the cross bar 1, the curvature of the arc scraper is consistent with the designed curvature of the inverted arch cushion, a roller 4 is respectively arranged at both ends of the cross bar 1, and a U-shaped pull rod 5 is welded on one side of the cross bar 1 in a direction perpendicular to the plane of the arch piece; each guide rail 6 comprises a channel steel with a notch facing upward, a jack 7 is vertically arranged at the bottom of both ends of the channel steel, and the upper end of the piston rod of the jack is welded to the cross bar; the rollers 4 at both ends of the cross bar are respectively supported in the notches of the channel steels of the two guide rails 6 and can roll along the longitudinal direction of the channel steels.

[0012] During the specific implementation of the utility model, in order to facilitate processing, the cross bar 1 can be made of a round steel tube, and a shaft rod 8 that can rotate in the round steel tube is passed through the round steel tube. The two ends of the shaft rod 8 protrude outside the two ends of the round steel tube and are respectively welded to the axis of the two rollers 4.

[0013] The arc-shaped scraper rod can be formed by bending a square steel pipe.

[0014] In order to ensure the stability of the guide rail, a bottom plate with an area larger than the cross-section of the jack can be welded at the bottom of each jack 7.

[0015] In order to prevent the roller from being separated from the guide rail, a limiting plate 9 can be welded to both ends of the channel steel notch of the guide rail.

[0016] The usage of the utility model is as follows:

[0017] After the tunnel arch pit is excavated, the arch cushion concrete is evenly poured and leveled before the concrete begins to set;

[0018] First, two guide rails are placed on both sides of the invert along the tunnel longitudinal direction. The length of the guide rails is determined according to the length of the invert segmented construction, generally 10-20m. The two rollers of the arch truss are supported on the two guide rails. According to the designed elevation of the bottom of the invert cushion layer, the height of the guide rails and the scraper rod of the arch truss are adjusted by the jack;

[0019] In the middle of the tunnel, the arch truss piece is dragged by mechanical or human means through the U-shaped pull rod on the arch truss piece to scrape the curved surface of the invert arch cushion concrete. During the scraping process, the missing positions of the cushion concrete are filled manually, and then the scraping is repeated again and again. After multiple manual filling and scraping, the surface flatness of the concrete cushion meets the requirements, the concrete is cured, and the scraping device is moved to the next invert arch working section for construction.

Claims

1. A device for leveling the curved surface of an inverted arch cushion concrete, characterized in that: It includes an arch truss piece and two parallel guide rails; the arch truss piece includes a cross bar and an arc scraper rod, the arc scraper rod is located below the cross bar, the outer arc surface of the arc scraper rod faces downward, and multiple webs are welded between the inner arc surface of the arc scraper rod and the cross bar, the curvature of the arc scraper rod is consistent with the designed curvature of the arch cushion layer, a roller is respectively arranged at both ends of the cross bar, and a U-shaped pull rod is welded on one side of the cross bar in a direction perpendicular to the plane of the arch frame piece; each guide rail includes a channel steel with a notch facing upward, and a jack is vertically arranged at the bottom of both ends of the channel steel, and the upper end of the piston rod of the jack is welded to the cross bar; the rollers at both ends of the cross bar are respectively supported in the notches of the channel steels of the two guide rails and can roll longitudinally along the channel steels.

2. The device for flattening the curved surface of the inverted arch cushion concrete according to claim 1, characterized in that: The cross bar is a round steel pipe, and a shaft rod is rotatably arranged inside the round steel pipe, and two ends of the shaft rod are respectively welded to the axles of the two rollers.

3. The device for flattening the curved surface of the inverted arch cushion concrete according to claim 1, characterized in that: The arc-shaped scraper rod is formed by bending a square steel pipe.

4. The device for flattening the curved surface of the inverted arch cushion concrete according to claim 1, characterized in that: A bottom plate with an area larger than the cross-section of the jack is welded at the bottom of each jack.

5. The device for flattening the curved surface of the inverted arch cushion concrete according to claim 1, characterized in that: A limiting plate is welded at both ends of the channel steel notch of the guide rail.

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