CN209868976U - A device for injecting retarder to make fiber continuous at joints of concrete structures - Google Patents

Abstract

The utility model relates to a civil engineering technical field especially relates to an pour into retarder messenger concrete structure seam crossing fibre continuation device, including being used for the seam template that is connected with concrete structure, be provided with the cavity that is used for loading the retarder in the seam template, the upper end of seam template is provided with and is linked together with the cavity and is used for the slip casting pipe that pours into the retarder into in the cavity into, and the interval is provided with the grout outlet of wearing out the cavity on the panel that the seam template is close to concrete structure one side. The device can keep the fiber continuity of the joints of the precast concrete structures or the cast-in-place concrete in the process of pouring in different times, so that the stress of the joints is reasonable.

Description

A device for injecting retarder to make fiber continuous at joints of concrete structures

technical field

The utility model relates to the technical field of civil engineering, in particular to a device for injecting a retarder to make fibers at joints of concrete structures continuous.

Background technique

Whether it is a prefabricated structure or a staged pouring structure, it is difficult to avoid the existence of joints (including construction joints, boundary joints, etc.), which also involves the connection of old and new concrete interfaces. Especially for concrete structures with fibers, the existence of joints will lead to fiber discontinuity, so that the joints become their weak points. Common seams in engineering include flat seams, zigzag seams, stepped seams, tongue and groove seams, etc. Flat seams are widely used due to their simple construction, but their crack resistance is insufficient and easy to be damaged; zigzag seams and stepped seams increase the contact area of the seam interface on the basis of flat seams, thereby increasing the joint strength. crack strength at the seam, but the enhancement effect is not obvious enough and the construction formwork is complicated; the tongue-and-groove joint, on the basis of increasing the contact area of the joint, makes the tensile stress part of the joint bear through the interlocking effect of the tongue-and-groove structure It is transformed into shear stress, which further improves the crack resistance of the joint, but also increases the difficulty of construction, and the quality of the joint is difficult to guarantee.

Although the above-mentioned joint construction measures can partially improve the joint strength, they fail to fundamentally solve the problem of weak stress at the joint, especially for concrete with fibers, where the fibers at the joint are artificially "truncated". The cracking strength of the joints is reduced, and the advantages of the structure and the material itself cannot be brought into play.

Contents of the invention

The purpose of the utility model is to provide a device for injecting retarder to make the fiber continuous at the joint of concrete structure, which can keep the fiber at the joint of precast concrete structure or cast-in-place concrete continuous in the process of batch pouring, Make the seam stress reasonable.

The technical solution of the utility model is: a device for injecting retarder to make the fiber continuous at the joint of concrete structure, including a joint formwork for connecting with the concrete structure, the joint formwork is provided with a set for filling retarder The upper end of the joint formwork is provided with a grouting pipe that communicates with the cavity and is used to inject retarder into the cavity, and the panel on the side of the joint formwork close to the concrete structure is provided at intervals to pass through the cavity. Pulp hole.

Further, a horizontal partition and/or a vertical partition are arranged between the two panels of the joint formwork, and the horizontal partition and the vertical partition are respectively provided with holes for interconnecting the inner cavities of the joint formwork. openings, the horizontal partitions are vertically spaced, and the vertical partitions are horizontally spaced.

Further, as for the horizontal stiffeners and/or vertical stiffeners on the non-concrete side of the joint formwork, the horizontal stiffeners are vertically spaced, and the vertical stiffeners are horizontally spaced.

Further, the width of the concrete adjacent to the surface of the joint formwork is 10mm-25mm.

Further, the concrete at the joints of the concrete structure is poured with fiber-reinforced concrete or ultra-high-performance concrete, and the concrete at the rest of the concrete structure is poured with ordinary concrete, fiber-reinforced concrete, high-performance concrete or ultra-high-performance concrete.

Further, the concrete at the joint of the concrete structure is mixed with randomly distributed fibers, and the shape of the fibers is straight, helical or corrugated.

Further, the fiber content at the joints of the concrete structure is greater than that at the non-joints of the concrete structure.

Further, the fiber length is 13mm-50mm.

Compared with the prior art, the utility model has the following advantages: it fundamentally solves the problem of the weak force of the concrete structure at the joint, especially the discontinuous fiber at the connection joint of the concrete structure mixed with fibers It is not necessary to improve the joint performance by changing the joint shape, dense reinforcement or special-shaped steel plates and other complex joint forms, so that the fibers at the joints of the precast concrete structure or the joints of the cast-in-place concrete during the batch pouring process remain continuous, Make the joint stress reasonable and high crack strength. The utility model has the advantages of simple and convenient operation, reduced engineering cost, convenient construction, excellent structural performance and good promotion prospect.

Description of drawings

Fig. 1 is the front view of the fasting formwork with holes of the present utility model;

Fig. 2 is the side view of the fasting formwork with holes of the present utility model;

Fig. 3 is the rear view of the fasting formwork with holes of the present utility model;

Fig. 4 is the A-A sectional view of Fig. 2 of the present utility model;

In the figure: 1-concrete structure; 11-retarder action area; 2-retarder; 3-joint formwork; 31-cavity; 4-grouting pipe; 5-grouting hole; 6-vertical stiffening Rib; 7-horizontal stiffener; 8-vertical partition; 9-horizontal partition, 10-opening.

Detailed ways

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific examples are given together with the accompanying drawings and described in detail as follows, but the present invention is not limited thereto.

Refer to Figure 1 to Figure 4

A device for injecting a retarder to make the fiber continuous at the joint of a concrete structure, including a joint formwork 3 for connecting with a concrete structure 1, the joint formwork is provided with a cavity 31 for filling a retarder 2, The upper end of the joint formwork is provided with a grouting pipe 4 which communicates with the cavity and is used to inject retarder into the cavity, and grouting holes passing through the cavity are arranged at intervals on the panel on the side of the joint formwork close to the concrete structure 5.

In this embodiment, in order to improve the strength of the joint formwork, a horizontal partition 9 and/or a vertical partition 8 are arranged between the two panels of the joint formwork, and the cavity of the joint formwork passes through the horizontal partition The horizontal partition and the vertical partition are respectively provided with openings 10 that make the adjacent two independent chambers communicate with each other, and the horizontal partition is spaced vertically Arranged, the vertical partitions are arranged at intervals along the transverse direction.

In this embodiment, the horizontal stiffeners 7 and/or vertical stiffeners 6 on the non-concrete side of the joint formwork, the horizontal stiffeners are vertically spaced, and the vertical stiffeners are horizontally spaced.

In this embodiment, the width of the concrete adjacent to the surface of the joint formwork is 10 mm to 25 mm.

In this embodiment, the concrete at the joints of the concrete structure is made of fiber concrete or ultra-high performance concrete, and the concrete of the rest of the concrete structure is made of ordinary concrete, fiber concrete, high performance concrete or ultra high performance concrete. .

In this embodiment, the concrete at the joint of the concrete structure is mixed with randomly distributed fibers, and the shape of the fibers is straight, helical or corrugated.

In this embodiment, the fiber content at the joints of the concrete structure is greater than that at the non-joints of the concrete structure.

In this embodiment, the fiber length is 13mm-50mm, and the fibers are mixed with different lengths or different types or different diameters, such as steel fibers.

When the joints of the concrete structure need to be made with formwork, the retarder is injected into the concrete within a certain width range near the surface of the joint formwork by grouting after the concrete is poured and before the initial setting. Before pouring the concrete near the joint, wrap the joint formwork with plastic cloth and other impermeable materials to prevent the concrete from entering the grout hole, inject retarder into the cavity of the joint formwork, and apply a certain pressure to remove the plastic cloth. The retarder is injected into the concrete. The mixing ratio of setting retarder and the start time of scouring need to be determined according to the actual environment and materials, and adjusted to the best ratio and best time control.

The above descriptions are only preferred embodiments of the present utility model, and all equivalent changes and modifications made according to the patent scope of the present utility model shall fall within the scope of the present utility model.

Claims (8)

1. The device for injecting the retarder to enable fibers at the joint of the concrete structure to be continuous is characterized by comprising a joint template connected with the concrete structure, wherein a cavity used for filling the retarder is formed in the joint template, a grouting pipe communicated with the cavity and used for injecting the retarder into the cavity is arranged at the upper end of the joint template, and grout outlet holes penetrating out of the cavity are formed in the panel, close to one side of the concrete structure, of the joint template at intervals.

2. The device for injecting retarder to continue fibers at joints of concrete structures as claimed in claim 1, wherein horizontal and/or vertical partition plates are disposed between the two panels of the joint formwork, and the horizontal and vertical partition plates are respectively provided with openings for communicating the cavities in the joint formwork with each other, and are vertically spaced and are horizontally spaced.

3. An apparatus for fiber continuity at a joint of a concrete structure by injecting retarder according to claim 1 or 2, wherein the horizontal stiffeners are vertically spaced apart and the vertical stiffeners are laterally spaced apart on the non-concrete side of the joint formwork.

4. The apparatus for fiber continuation at the joint of a concrete structure by injecting retarder according to claim 1 or 2, wherein the width of the concrete adjacent to the surface of the joint formwork is 10mm ~ 25 mm.

5. The apparatus for injecting retarder into the joint of concrete structure for fiber continuity according to claim 1 or 2, wherein the concrete at the joint of concrete structure is cast by fiber concrete or ultra high performance concrete, and the concrete at the rest of the concrete structure is cast by general concrete, fiber concrete, high performance concrete or ultra high performance concrete.

6. The device for injecting retarder to enable the fibers at the joints of the concrete structures to be continuous is characterized in that the concrete at the joints of the concrete structures is doped with disorderly distributed fibers, and the fibers are flat, spiral or corrugated.

7. The device for injecting retarder to make the concrete structure joint fiber continuous according to claim 6, wherein the fiber content at the concrete structure joint is greater than or equal to the fiber content at the concrete structure non-joint.

8. The apparatus for injecting retarder to continue fibers at joints of concrete structures as claimed in claim 6, wherein the length of the fibers is 13mm ~ 50 mm.