A construction assembly for forming a precision underground engineering concrete deformation joint

Abstract

This application discloses a structural component for forming precise concrete expansion joints in underground engineering, comprising: a pair of angle steels, each angle steel segment having φ6 anchor bars pre-welded to its inner angle in a ring arrangement; φ16 anchor bolts pre-welded to the angle steels, the anchor bolts being perpendicular to the angle steels; a prefabricated bottom template, the bottom template having a triangular notch parallel to and near the edge of the concrete expansion joint; and a prefabricated top template, the top template also having a triangular notch parallel to and near the edge of the concrete expansion joint; the number and position of the triangular notches in the bottom and top templates correspond to the number and position of the anchor bolts on the angle steels; in use, the bottom and top templates are set perpendicular to each other, and the notches on the bottom and top templates enclose the anchor bolts, the anchor bolts locking the bottom and top templates to the angle steels with nuts. This application can achieve precise construction of concrete expansion joints in underground engineering, thereby solving the problem of leaky concrete expansion joints (out of ten joints).

Description

Technical Field

[0001] This application relates to a structural component for forming a precision underground engineering concrete expansion joint, belonging to the field of building engineering technology. Background Technology

[0002] Traditional concrete expansion joints are notoriously prone to leaks, with nine out of ten joints leaking. While there are many reasons for this, the generally poor construction quality of the joints is a major contributing factor. This includes the installation of removable waterstops, which have seen very few practical applications over the decades. The main reason is that the precision of the embedded parts within the concrete expansion joints falls far short of the required standards, resulting in a high failure rate. Furthermore, there has been a lack of research on the precision of on-site embedding, leading to the absence of a significant solution for improving the precision of concrete expansion joints in underground engineering projects. Summary of the Invention

[0003] In view of this, the technical problem to be solved by this application is to provide a structural component for forming a precision underground engineering concrete expansion joint, so as to solve the problems of rough construction of concrete expansion joints in the prior art, which cannot achieve the expected precision and leads to a series of subsequent waterproofing difficulties.

[0004] To address the aforementioned problems, one aspect of this application provides a structural component for forming a precision underground engineering concrete expansion joint, comprising:

[0005] Pairs of angle steel are embedded in both sides of the proposed concrete expansion joint; each section of angle steel is also pre-welded with φ6 anchor bars arranged in a ring at a 45-degree angle at the inner corner.

[0006] The angle steel is also pre-welded with φ16 anchor bolts, which are perpendicular to the angle steel.

[0007] The precast bottom formwork is long and narrow, with a width corresponding to the spacing of the upper anchor bolts; the bottom formwork has triangular notches along its parallel edges near the concrete expansion joints; and

[0008] The precast upper formwork is long and narrow, with its two sides coinciding with the centerlines of two adjacent anchor bolts; the upper formwork has a triangular notch parallel to the edge of the concrete expansion joint.

[0009] The number and position of the triangular notches in the bottom template and the top template correspond to the number and position of the anchor bolts on the angle steel. In use, the bottom template and the top template are set perpendicular to each other, and the notches on the bottom template and the top template wrap around the anchor bolts. The anchor bolts lock the bottom template and the top template onto the angle steel with nuts.

[0010] The beneficial effects are: it can ensure the precise positioning and reliable anchoring of anchors, provide strong support for the construction technology of sealing and separating concrete expansion joints, open up a new path for the standardized design and construction of concrete expansion joints, and is expected to fundamentally solve the stubborn problem of leakage in nine out of ten joints. Attached Figure Description

[0011] Figure 1A The diagram shown is a cross-sectional view of the arrangement of angle steel in the side wall of the proposed concrete expansion joint.

[0012] Figure 1B The diagram shown is an elevation view of the arrangement of the angle steel in the side wall of the proposed concrete expansion joint.

[0013] Figure 2 The diagram shown is a schematic diagram of the formwork setup for the expansion joint where one side of the concrete is poured first in this application.

[0014] Figure 3 The diagram shown is a schematic of the pre-cut triangular notch in the bottom formwork of the concrete expansion joint on the side of the post-cast concrete in this application.

[0015] Figure 4 The diagram shown is a pre-cut notch in the bottom formwork of the expansion joint on the side of the concrete to be poured after this application, with shims and nuts installed.

[0016] Figure 5 The diagram shown is a schematic of the notch in the upper formwork of the concrete expansion joint on the side after pouring in this application.

[0017] Figure 6 The image shown is a partially enlarged schematic diagram of the bottom and top templates at the notch in this application. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer and more understandable, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit the scope of this application.

[0019] In this application, all length units are in mm.

[0020] To achieve the goal of constructing precision underground engineering concrete expansion joints, this application proposes a structural component for forming precision underground engineering concrete expansion joints, comprising:

[0021] Pairs of angle steel are pre-embedded on both sides of the proposed concrete expansion joint; each angle steel section is also pre-welded with φ6 anchor bars arranged in a ring at a 45-degree angle at its inner corner; φ16 anchor bolts are also pre-welded to the angle steel, and the anchor bolts are perpendicular to the angle steel.

[0022] The precast bottom formwork is long and narrow, with a width corresponding to the spacing of the upper anchor bolts; the bottom formwork has triangular notches along its parallel edges near the concrete expansion joints; and

[0023] The precast upper formwork is long and narrow, with its two sides coinciding with the centerlines of two adjacent anchor bolts; the upper formwork has polygonal notches parallel to and close to the edges of the concrete expansion joint.

[0024] The number and position of the triangular notches on the bottom template and the polygonal notches on the top template correspond to the number and position of the anchor bolts on the angle steel. In use, the bottom template and the top template are set perpendicular to each other, and the notches on the bottom template and the top template wrap around the anchor bolts. The anchor bolts lock the bottom template and the top template onto the angle steel with nuts.

[0025] In at least one embodiment: a circular washer is also provided between the anchor bolt and the nut. The circular washer covers the gap between the bottom template and the upper template and the anchor bolt. The gap on the bottom template presses against the anchor bolt and the gap on the upper template wraps the circular washer and the anchor bolt, so that the concrete joint and the embedded part are firmly and accurately positioned.

[0026] In at least one embodiment, it further includes keel and wooden blocks, which are set on the template to press the bottom template or the top template.

[0027] In at least one embodiment: the angle steel is installed in segments along the entire length according to the width of the proposed concrete expansion joint.

[0028] In at least one embodiment, the notch is triangular in shape.

[0029] In at least one embodiment: both the bottom template and the top template are 18mm thick, 11-layer plywood.

[0030] In at least one embodiment, the exposed sides of the bottom template and the top template are coated with two coats of penetrating epoxy resin.

[0031] The specific implementation process of this application will be described in detail below with reference to the accompanying drawings.

[0032] like Figure 1A and 1B The diagram illustrates the installation of angle steel in a proposed concrete expansion joint. First, prefabricated angle steel 1 is prepared on-site. Each section of angle steel 1 has φ6mm anchor bars 2 pre-welded to its inner angle in a ring configuration at a 45-degree angle. φ16mm anchor bolts 4 are also welded to angle steel 1, with the welding completed in the factory using specialized auxiliary equipment. The anchor bolts 4 are perpendicular to angle steel 1 and pass through fixing holes on angle steel 1 with an error not exceeding 0.2mm. The fixing holes on the angle steel are not less than 10mm in diameter, and the fixing holes are fully welded to the perimeter of the anchor bolts 4. Prefabricated bottom formwork 5 and top formwork 6 are also present. Both bottom and top formwork 5 are elongated and have a width corresponding to the spacing of the anchor bolts 4. The bottom formwork 5 has a triangular notch 9 parallel to and near the edge of the concrete expansion joint; the top formwork 6 has a polygonal notch parallel to and near the edge of the concrete expansion joint.

[0033] In use, continuous angle steel 1 is installed in sections on both sides of the proposed concrete expansion joint 10, and pouring formwork is arranged sequentially on both sides of the concrete expansion joint, such as... Figure 2The diagram shows the formwork setup for pouring one side of concrete 12 first. The bottom formwork 5 and the upper formwork 6 are set perpendicular to each other, and the upper formwork 6 is parallel to the concrete expansion joint 10. Figure 6 As shown, the notch 9 on the bottom template 5 and the notch 9 on the upper template 6 form a ring that surrounds the anchor bolt 4. A circular washer 11 is also provided between the anchor bolt 4 and the nut 3. Then, the bottom template 5 and the upper template 6 are locked together by the anchor bolt 4 and the nut 3. The locking state can be seen from the reference. Figure 5 and Figure 6 As shown. Further reinforcement with joists 8 and wooden blocks 7 on the outer sides of the bottom formwork 5 and top formwork 6 ensures precise pouring of the concrete expansion joint. For example... Figure 3 and Figure 4 as well as Figure 5 The diagram shows the formwork setup for the post-cast side. The bottom formwork 5, with its vertically aligned joists 8, should be densely arranged. The bottom formwork 5 and the upper formwork 6 are perpendicular to each other, and the upper formwork 6 is parallel to the concrete expansion joint 10. The notches 9 on the bottom formwork 5 and the upper formwork 6 form a ring enclosing the anchor bolt 4. After alignment, a temporary large circular washer 11 is placed and tightened with nuts 3 to secure the embedded anchor bolt 4 to the bottom and upper formwork 5 and 6. During concrete pouring, any minor deformation or displacement of the formwork will not affect the embedding accuracy of the angle steel 1 relative to the concrete. The upper formwork 6 has a pre-cut triangular opening at the anchor bolt 4, the triangular size being approximately half the size of the circumscribed regular hexagon of the washer. Figure 5 As shown. All bottom and top templates are made of 18mm thick, 11-layer plywood, with two coats of penetrating epoxy resin applied to the exposed sides.

[0034] The structural components used in this application to form precision underground engineering concrete expansion joints bypass the common problem of traditional formwork being generally crude and unreliable. Angle steel 1, anchor bars 2, and φ16 anchor bolts 4, among other embedded parts, are pre-welded in the factory, ensuring accuracy. During on-site embedding, simply fixing the angle steel according to the width and length of the proposed concrete expansion joint, along with the correspondingly designed template, determines the precise shape of the entire concrete expansion joint. The template at the joint is divided into a bottom form and an upper form, with pre-cut notches at the anchor bolts. These notches are polygonal in shape, such as triangles or triangular shapes, ensuring secure and precise positioning. Circular washers also cover the gaps between the notches in the bottom and upper formwork 5 and the anchor bars, preventing concrete from shifting during pouring and facilitating easy loading and unloading. Furthermore, the use of joists and wooden blocks on the outer sides of the bottom and upper formwork for compression ensures that the concrete expansion joint does not deform during pouring. Because the constructed concrete expansion joints can meet the precision specified in the design drawings, the matching concrete expansion joint waterproofing structure, whether it is the waterproofing material for sealing inside the joint or the pressure-resistant anchors outside the joint, can be more evenly stressed and fixed, making the waterproofing reliable and convenient for maintenance.

[0035] The beneficial effects are: it can ensure the precise positioning and reliable anchoring of anchors, provide strong support for the construction technology of sealing and separating concrete expansion joints, open up a new path for the standardized design and construction of concrete expansion joints, and is expected to fundamentally solve the stubborn problem of leakage in nine out of ten joints.

[0036] The preferred embodiments of this application have been described above with reference to the accompanying drawings, but this does not limit the scope of the application. Those skilled in the art can implement this application in various modifications without departing from its scope and spirit; for example, a feature of one embodiment can be used in another embodiment to obtain yet another embodiment. Any modifications, equivalent substitutions, and improvements made within the scope of the technical concept of this application should be within the scope of the application.

Claims

1. A structural component for forming precision underground engineering concrete expansion joints, characterized in that... include: Pairs of angle steel are embedded in pairs on both sides of the proposed concrete expansion joint; wherein, the inner corner of each angle steel is pre-welded with φ6mm anchor bars arranged in a ring, the anchor bars being set at a 45-degree angle; φ16 anchor bolts are also pre-welded onto the angle steel, the anchor bolts being perpendicular to the angle steel. The prefabricated bottom formwork is elongated and has a width corresponding to the spacing of the anchor bolts on the angle steel; the bottom formwork has a triangular notch at its parallel edge near the concrete expansion joint; and The prefabricated upper template is long and narrow, with its two sides coinciding with the centerlines of two adjacent anchor bolts; the upper template has polygonal notches parallel to and near the edge of the concrete expansion joint. The number and position of the triangular notches on the bottom template and the polygonal notches on the top template correspond to the number and position of the anchor bolts on the angle steel. In use, the bottom template and the top template are set perpendicular to each other, and the notches on the bottom template and the top template wrap around the anchor bolts. The anchor bolts lock the bottom template and the top template onto the angle steel with nuts.

2. The structural component according to claim 1, characterized in that: A circular washer is also provided between the anchor bolt and the nut. The circular washer covers the gap between the bottom template and the upper template and the anchor bolt. The gap on the bottom template is pressed against the anchor bolt and the gap on the upper template is wrapped around the circular washer and the anchor bolt, so that the concrete cannot leak during pouring.

3. The structural component according to claim 1, characterized in that: It also includes keel and wooden blocks, which are set on the bottom template or the top template to press the bottom template and the top template together.

4. The structural component according to claim 1, characterized in that: The angle steel is installed in sections along the entire length according to the width of the proposed concrete expansion joint.

5. The structural component according to claim 1, characterized in that: The notch is triangular in shape.

6. The structural component according to claim 1, characterized in that: Both the bottom template and the top template are made of 18mm thick, 11-layer plywood.

7. The structural component according to claim 6, characterized in that: The exposed sides of the bottom template and the top template are coated with two coats of penetrating epoxy resin.

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