A device for pre-embedded sleeves for measuring control points of segmental beams

Abstract

This utility model discloses a device for embedding a pre-embedded sleeve for measuring control points of a segmental beam, comprising: an embedded sleeve, which is embedded in the concrete of the segmental beam to be poured, with its top surface lower than the top surface of the segmental beam; a conical sleeve, the smaller end of which is detachably connected to the top of the embedded sleeve and partially embedded in the concrete of the segmental beam; and a bracket, one end of which is detachably connected to the conical sleeve, and the other end of which is detachably connected to the embedded sleeve on the end formwork of the segmental beam or on the already poured matching beam. This utility model can stabilize the embedded sleeve during concrete pouring and curing, and accurately control the elevation and verticality of the top surface of the embedded sleeve.

Description

Technical Field

[0001] This utility model relates to the field of cast-in-place construction technology for segmental beams. More specifically, this utility model relates to a device for embedding a sleeve for pre-embedded measurement control points in segmental beams. Background Technology

[0002] Segmented beams refer to beam bridges whose superstructure is divided into several segments, prefabricated in a factory, and assembled into a whole using post-tensioning and wet joints. When using the short-line matching method for prefabrication, all segments are cast on prefabrication platforms. During casting, a fixed end formwork is installed at one end of the segment to be cast, while the other end uses the previously cast segment as a matching beam to form a matching joint and ensure the splicing accuracy of adjacent segments. After the subsequent segment is cast and demolded, the previous segment is transported and stored, and then the subsequent segment is moved to its position as a matching beam, thus completing the prefabrication of all segments in this cycle.

[0003] To control the alignment of precast and assembled segmental beams, measurement control points are pre-embedded in the top slab during precasting. Points along the centerline of the segment control the planar position, while points along the top surfaces of the two side webs control the elevation, forming one horizontal control line and two elevation control lines. Automated measurement technology, due to its high efficiency and accuracy, is gradually replacing traditional manual measurement. When applying automated measurement technology, sleeves need to be embedded at the measurement points as bases for socket-type small prisms. During embedding, the top surface of the sleeve should be slightly higher than the concrete surface to prevent the socket-type small prism's supporting surface from contacting the concrete surface, which would affect measurement accuracy. Traditionally, the sleeves are pressed into the uncured concrete after pouring and before initial setting. The following problems exist: 1. If the concrete has good fluidity, pressing the sleeve into the concrete will cause the sleeve to sink, resulting in the sleeve being buried or its top surface being lower than the concrete surface, ultimately causing the measuring point to fail or increasing the measurement error; 2. If the sleeve is installed too late, when the concrete surface has already hardened, pressing the sleeve into the concrete will cause a large surface depression, causing local quality defects, and the sleeve cannot be effectively wrapped by the surrounding concrete, resulting in poor fixation; 3. The method of pressing the sleeve cannot effectively control the verticality. When the deviation is large, it will cause the socket-type small prism to tilt or fail to contact the top of the sleeve, increasing the measurement error; 4. If the sleeve is too far above the beam surface, the top of the sleeve is easily subjected to compression or impact, and the top deformation will cause the socket-type small prism to fail to be inserted or the plug to fall off, ultimately causing the measuring point to fail. Therefore, it is necessary to propose a pre-embedded sleeve installation device for segmental beam measurement control points to solve the problems of high timing requirements, large installation errors, and easy failure of current pre-embedded sleeve installation. Utility Model Content

[0004] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0005] To achieve these objectives and other advantages according to this utility model, a device for pre-embedded sleeves for segmental beam measurement control points is provided, comprising:

[0006] The pre-embedded sleeve is embedded in the concrete of the segment beam to be poured, and its top surface is lower than the top surface of the segment beam to be poured.

[0007] A tapered sleeve, the smaller diameter end of which is detachably connected to the top of the pre-embedded sleeve, and partially embedded in the concrete of the segmental beam to be poured;

[0008] The bracket has one end detachably connected to the tapered sleeve and the other end detachably connected to the pre-embedded sleeve on the end formwork of the beam segment to be poured or the already poured matching beam.

[0009] Preferably, the tapered sleeve has a through hole running vertically through its center; the inner wall of the through hole has an internal thread; and the outer wall of the upper end of the pre-embedded sleeve has an external thread that mates with the internal thread.

[0010] Preferably, one end of the bracket is threadedly connected to the upper end of the tapered sleeve by a bolt, and the other end has an elongated hole.

[0011] Preferably, when the bracket is connected to the end template, the bracket is a Z-shaped bracket, with its higher end detachably connected to the tapered sleeve and the other end detachably connected to the end template.

[0012] Preferably, when the bracket is connected to the embedded sleeve on the cast-in-place matching beam, the bracket is a flat plate structure, and the embedded sleeve on the cast-in-place matching beam is provided with the tapered sleeve.

[0013] Preferably, the bracket is also threaded with an adjusting bolt, which is disposed between the two pre-embedded sleeves, and the bottom of the adjusting bolt is supported on the cast-in-place matching beam.

[0014] This utility model has at least the following beneficial effects:

[0015] 1. The segmental beam measurement control point pre-embedded sleeve embedding device provided by this utility model can stabilize the pre-embedded sleeve during concrete pouring and curing, accurately control the elevation and verticality of the top surface of the pre-embedded sleeve, and avoid the situation where the sleeve is buried inside the concrete or tilted in the traditional pressing embedding method. In addition, the top surface of the pre-embedded sleeve is lower than the concrete surface, so it will not be submerged by the concrete during pouring, and it can also avoid damage to the top surface of the pre-embedded sleeve that would cause the measuring point to fail.

[0016] 2. The segmental beam measurement control point pre-embedded sleeve embedding device provided by this utility model can set an annular groove around the top surface of the pre-embedded sleeve through the conical sleeve, so that the socket-type small prism base can contact the top surface of the pre-embedded sleeve and not be blocked by the concrete, thereby improving the measurement accuracy.

[0017] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the embedded device when the bracket is connected to the end template in this utility model;

[0019] Figure 2 This is a schematic diagram of the embedded device when the bracket is connected to the pre-embedded sleeve on the cast-in-place matching beam in this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the socket-type small prism in this utility model when it is installed on the pre-embedded sleeve;

[0021] Figure 4 This is a schematic diagram showing the location of the measurement control points for the segmental beam in this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the pull-out nut described in this utility model; Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0024] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] like Figures 1 to 5 As shown, this utility model provides a device for embedding a sleeve for pre-embedded control points in segmental beam measurement, characterized in that it includes:

[0026] The pre-embedded sleeve 1 is embedded in the concrete of the segment beam 9 to be poured, and its top surface is lower than the top surface of the segment beam 9 to be poured.

[0027] The tapered sleeve 2 has a smaller diameter end that is detachably connected to the top of the pre-embedded sleeve 1 and is partially embedded in the concrete of the segmental beam 9 to be poured.

[0028] The bracket 4 has one end detachably connected to the tapered sleeve 2, and the other end detachably connected to the pre-embedded sleeve 1 on the end formwork 5 of the segment beam to be poured or the already poured matching beam 7.

[0029] In this technical solution, considering that one side of the segmental beam to be poured is the end formwork 5, and the other side is the already poured matching beam 7, such as Figure 4 As shown, the measurement control points 10 on the segmental beam 9 to be poured are located near the end formwork 5 or the already poured matching beam 7. Therefore, the bracket 4 and the conical sleeve 2 are installed. The conical sleeve 2 is used to extend the embedded sleeve 1, connecting it to the upper bracket 4, thereby fixing the embedded sleeve 1 to the end formwork 5 or the already poured matching beam 7. This stabilizes the embedded sleeve during concrete pouring and curing, precisely controlling the elevation and verticality of the top surface of the embedded sleeve, avoiding the situation where the sleeve is buried inside the concrete or tilted, which occurs in the traditional pressing and embedding method. Furthermore, the connection between the conical sleeve 2 and the embedded sleeve 1 allows the top surface of the embedded sleeve 1 to be slightly lower than the concrete surface, preventing it from being submerged in concrete during pouring and avoiding damage to the top surface of the embedded sleeve 1 that could cause the measuring points to fail. After the concrete has initially cured, the bracket 4 and the conical sleeve 2 can be disassembled.

[0030] In another technical solution, the tapered sleeve 2 has a through hole running vertically through its center; the inner wall of the through hole has an internal thread; the upper outer wall of the embedded sleeve 1 has an external thread that mates with the internal thread. The smaller diameter end of the tapered sleeve 2 is fitted onto the embedded sleeve 1 and threadedly connected to it. Figure 3 As shown, the smaller diameter end of the conical sleeve 2 is embedded in the concrete of the segment beam 9 to be poured. After the concrete has cured, the conical sleeve 2 is rotated in the opposite direction to remove it. This forms an annular groove around the top surface of the pre-embedded sleeve 1, so that the base of the socket-type small prism 8 can contact the top surface of the pre-embedded sleeve without being blocked by the concrete, thus improving the measurement accuracy.

[0031] In another technical solution, one end of the bracket 4 is threadedly connected to the upper end of the tapered sleeve 2 via a bolt 3, and the other end has an elongated hole. The bolt 3 passes through the bracket 4 and extends into the through hole of the tapered sleeve 2, where it is threadedly connected. By providing an elongated hole at the other end of the bracket 4, the position of the embedded sleeve 1 on the segment beam 9 to be poured can be adjusted to avoid conflict with the position of the reinforcing bars.

[0032] In another technical solution, such as Figure 1 As shown, when the bracket 4 is connected to the end template 5, the bracket is a Z-shaped bracket, with its higher end detachably connected to the conical sleeve 2 and the other end detachably connected to the end template 5. Connecting the higher end of the Z-shaped bracket to the conical sleeve 2 on the segment beam 9 to be poured avoids contact between the bracket 4 and the concrete surface of the segment beam 9, facilitating the finishing of the concrete below. The bracket 4 can be fixed to the end template 5 using bolts and nuts.

[0033] In another technical solution, when the bracket 4 is connected to the embedded sleeve 1 on the cast-in-place matching beam 7, the bracket 4 is a flat plate structure, and the embedded sleeve 1 on the cast-in-place matching beam 7 is provided with the tapered sleeve 2. For example... Figure 2 As shown, the measuring points near the contact surface of the cast-in-place matching beam 7 are installed using a flat plate bracket and the existing pre-embedded sleeves 1 on the cast-in-place matching beam 7, which are connected as a whole by two sets of the conical sleeves 2.

[0034] Furthermore, on the side of the already cast matching beam 7, an adjusting bolt 6 is threadedly connected to the bracket 4. The adjusting bolt 6 is positioned between the two pre-embedded sleeves 1, and the bottom of the adjusting bolt 6 is supported on the already cast matching beam 7. By tightening the adjusting bolt 6, the pre-embedded height of the pre-embedded sleeve 1 on the segment beam 9 to be cast can be finely adjusted.

[0035] Considering that the pre-embedded sleeve 1 needs to be removed after the segmental beam is installed, such as Figure 5 As shown, the embedding device also includes a pull-out nut 11, the lower end of which is connected to the internal thread of the upper end of the tapered sleeve 2. When the embedded sleeve 1 needs to be removed, the tapered sleeve 2 and the pull-out nut 11 are installed in sequence, the embedded sleeve 1 is pulled out by external force, and then the hole in the beam is filled with hole filling material.

[0036] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A device for embedding a sleeve for pre-embedded control points in segmental beam measurement, characterized in that, include: The pre-embedded sleeve is embedded in the concrete of the segment beam to be poured, and its top surface is lower than the top surface of the segment beam to be poured. A tapered sleeve, the smaller diameter end of which is detachably connected to the top of the pre-embedded sleeve, and partially embedded in the concrete of the segmental beam to be poured; The bracket has one end detachably connected to the tapered sleeve and the other end detachably connected to the pre-embedded sleeve on the end formwork of the beam segment to be poured or the already poured matching beam.

2. The segmental beam measurement control point pre-embedded sleeve embedding device as described in claim 1, characterized in that, The tapered sleeve has a through hole running vertically through its center; the inner wall of the through hole has an internal thread; and the outer wall of the upper end of the pre-embedded sleeve has an external thread that mates with the internal thread.

3. The segmental beam measurement control point pre-embedded sleeve installation device as described in claim 2, characterized in that, One end of the bracket is threadedly connected to the upper end of the tapered sleeve by a bolt, and the other end has an elongated hole.

4. The segmental beam measurement control point pre-embedded sleeve installation device as described in claim 1, characterized in that, When the bracket is connected to the end template, the bracket is a Z-shaped bracket, with its higher end detachably connected to the tapered sleeve and the other end detachably connected to the end template.

5. The segmental beam measurement control point pre-embedded sleeve installation device as described in claim 1, characterized in that, When the bracket is connected to the embedded sleeve on the cast-in-place matching beam, the bracket is a flat plate structure, and the embedded sleeve on the cast-in-place matching beam is provided with the tapered sleeve.

6. The segmental beam measurement control point pre-embedded sleeve embedding device as described in claim 5, characterized in that, The bracket is also threaded with an adjusting bolt, which is located between the two pre-embedded sleeves, and the bottom of the adjusting bolt is supported on the cast-in-place matching beam.

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