CN206279628U - A kind of precast concrete reinforcing bar grouting connecting structure - Google Patents

Abstract

The utility model discloses a steel bar grouting connection structure of a prefabricated concrete component, which comprises a pre-embedded steel bar and a grout anchor steel bar. The pre-embedded steel bars are composed of straight steel bars and curved steel bars in an integrated structure, the curved steel bars are spiral steel bars, the upper part of the slurry anchor steel bar is arranged in the channel in the spiral steel bar, and the upper part of the slurry anchor steel bar It is overlapped with the pre-embedded steel bars, and the tunnel is poured with grouting material, and the grouting material is fastened and condensed together with the pre-embedded steel bars and the grout anchor steel bars that are overlapped together. The prefabricated concrete component reinforcement grouting connection structure reduces the process steps of the concrete component in the prefabrication process, shortens the lap length of the pre-embedded steel bar and the grout anchor steel bar, and can save grouting materials and steel materials required for on-site construction, reducing Rebar connection costs for precast concrete elements.

Description

A prefabricated concrete member reinforced grouting connection structure

technical field

The utility model belongs to the technical field of connection of prefabricated concrete components, in particular to a steel bar grouting connection structure of prefabricated concrete components.

Background technique

The development of construction industrialization is an inevitable way and development direction to realize the modernization of the construction industry. The connection nodes of precast concrete components are the weak links of prefabricated concrete structures. Among them, the connection of longitudinal steel bars of precast concrete components is the key. Reinforcement connection methods include lap joints, welding connections and mechanical connections. Due to the small connection parts of prefabricated concrete structures, it is not convenient to use these traditional reinforcement connection methods. Currently, the connection methods used in precast concrete components mainly include sleeves. Grout connections and restrained grout-anchor connections.

Constrained grout-anchor connections mainly include plug-in reserved hole grouting lap joint connection and corrugated pipe grouting anchor plug-in reinforcement connection. The utility model patent with the authorized announcement number of CN201217847 discloses a plug-in reserved hole grouting steel bar lap joint connection component. The patent sets pre-embedded steel bars in precast concrete components, and holes are reserved beside the pre-embedded steel bars, and spiral or closed ring-shaped reinforcing bars are arranged around the pre-embedded steel bars and holes along the length direction, and the pre-embedded concrete structure is used to embed next to the steel bars However, the shortcoming of this patent is that the positioning of the spiral or closed ring-shaped reinforcement is difficult, the process is complicated, and the production efficiency is low. The disadvantage of corrugated pipe grout anchor bar connection is that there is no lateral constraint on the periphery of the overlapping section, the connection strength is weak, and the overlapping length of the steel bar is too long, which wastes a lot of grouting material and steel.

At present, most of the sleeve grouting connection structures use half-grouting sleeves, and the cost of using half-grouting sleeves is relatively high. At the same time, the use of half-grouting sleeves requires threading treatment on the ends of pre-embedded steel bars, which makes it difficult to guarantee the connection performance at the sleeves. .

Utility model content

The technical problem to be solved by the utility model is to provide a prefabricated concrete component reinforcement grouting connection structure for the above-mentioned deficiencies in the prior art. The prefabricated concrete component reinforced grouting connection has a simple structure and reasonable design, which reduces the process steps of the concrete component in the prefabrication process, reduces the difficulty of transportation and on-site construction, and can save grouting materials and steel materials required for on-site construction, reducing the cost. The construction cost is improved, and the construction efficiency is improved.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a prefabricated concrete component steel bar grouting connection structure, which is characterized in that it includes pre-embedded steel bars and grout anchor steel bars, and the pre-embedded steel bars are pre-buried in the upper precast concrete components. The lower part of the slurry anchor reinforcement is arranged in the lower prefabricated concrete member. The embedded reinforcement is composed of a straight reinforcement and a curved reinforcement in an integrated structure. The curved reinforcement is a spiral reinforcement, and the upper part of the slurry anchor reinforcement is arranged in the spiral In the channel in the steel bar, the upper part of the grout anchor steel bar is overlapped with the pre-embedded steel bar, and the grouting material is poured in the channel, and the grouting material is overlapped with the pre-embedded steel bar, slurry The anchor steel bars are fastened and condensed into one.

The above-mentioned prefabricated concrete component steel bar grouting connection structure is characterized in that: the diameter of the grout anchor steel bar is the same as that of the straight steel bar.

The above-mentioned prefabricated concrete member reinforcement grouting connection structure is characterized in that: the overlapping length L of the grout anchor reinforcement and the pre-embedded reinforcement is L=15d, where d is the diameter of the grout anchor reinforcement.

The above-mentioned prefabricated concrete member reinforcement grouting connection structure is characterized in that: the overlapping length L of the grout anchor reinforcement and the pre-embedded reinforcement is equal to the height of the tunnel.

The above-mentioned prefabricated concrete component reinforcement grouting connection structure is characterized in that: the upper precast concrete component is provided with a grouting hole and an exhaust hole for discharging the air in the tunnel.

Compared with the prior art, the utility model has the following advantages:

1. The utility model is simple in structure and reasonable in design. By designing the straight steel bars and curved steel bars into an integrated structure, only the straight steel bars need to be positioned when prefabricating the upper prefabricated concrete components, avoiding the existing plug-in reserved hole grouting lap connection A complex process requiring two positioning operations.

2. The curved steel bar of the utility model is a spiral steel bar, which not only increases the anchorage length of the pre-embedded steel bar, but also reduces the lap length of the pre-embedded steel bar and the slurry anchor bar. The shorter lap length can reduce the difficulty of transportation and on-site installation It improves the construction efficiency, saves grouting materials and steel materials, and reduces construction costs.

3. The spiral steel bar of the utility model can increase the lateral restraint force of the upper precast concrete member and the lower precast concrete member, and avoid the technical problems of low connection strength and unreliable safety performance caused by the existing corrugated pipe grout anchor bar connection without lateral restraint .

To sum up, the utility model has the advantages of simple structure, convenient operation, low investment cost, reasonable structural design, convenient operation and good use effect.

The technical solutions of the present utility model will be further described in detail through the drawings and embodiments below.

Description of drawings

Fig. 1 is the use state figure of the utility model.

Fig. 2 is a schematic structural diagram of Fig. 1 after the grouting material is removed.

Fig. 3 is a schematic diagram of the positional relationship between the pre-embedded steel bars and the pre-embedded rods of the present invention.

Explanation of reference signs:

1—embedded steel bar; 1-1—straight steel bar; 1-2—bent steel bar;

2—slurry anchor reinforcement; 3—embedded rod; 3-1—groove;

4—Embedded exhaust pipe; 5—Exhaust hole; 6—Embedded grouting pipe;

7—grouting hole; 8—upper precast concrete component;

9—the lower prefabricated concrete component; 10—the tunnel; 11—the grouting material.

detailed description

As shown in Figure 1 and Figure 2, a prefabricated concrete component reinforcement grouting connection structure includes a pre-embedded steel bar 1 and a grout anchor steel bar 2. Set in the lower prefabricated concrete member 9, the pre-embedded steel bar 1 is composed of a straight steel bar 1-1 and a curved steel bar 1-2 in an integrated structure, the curved steel bar 1-2 is a spiral steel bar, and the slurry anchor steel bar 2 The upper part of the anchor is arranged in the channel 10 in the spiral steel bar, the upper part of the slurry anchor bar 2 is overlapped with the embedded steel bar 1, and the channel 10 is filled with a grouting material 11, and the grouting material 11 The pre-embedded steel bar 1 and the slurry anchor steel bar 2 that are lapped together are fastened and condensed into one.

In this embodiment, because the straight steel bar 1-1 and the curved steel bar 1-2 are in an integrated structure, it can be realized that when prefabricating the upper prefabricated concrete member 8, only the straight steel bar 1-1 needs to be positioned, and the existing plug-in reserved hole Grouting steel bar lap connection member needs to be positioned respectively to spiral reinforcing bar (corresponding to curved steel bar 1-2 of the present utility model) and pre-embedded reinforcing bar (corresponding to straight steel bar 1-1 of the present utility model) respectively when prefabricated concrete member, Moreover, the positioning of the spiral reinforcing rib is difficult, so the utility model has simple process and easy operation, which can improve production efficiency and reduce construction cost.

In this embodiment, the curved steel bar 1-2 is a spiral steel bar, and the spiral steel bar can increase the anchorage length of the upper precast concrete member 8 compared with the straight steel bar, and increase the lateral binding force of the upper precast concrete member 8 and the lower precast concrete member 9, At the same time, the lap length of the pre-embedded steel bar 1 and the grout anchor bar 2 is shortened. The short lap length can make the alignment of the upper precast concrete member 8 and the lower precast concrete member 9 easier during on-site construction, and can also save grouting materials and steel materials. Reduce construction costs.

During specific construction, as shown in Figure 3, after the pre-embedded steel bar 1 is positioned, the pre-embedded rod 3 is penetrated in the channel 10 in the spiral steel bar, and the upper prefabricated concrete member 8 is poured. The pre-embedded rod 3 prevents concrete from being poured into the channel 10 during pouring. After the upper precast concrete member 8 is initially set, the pre-embedded rod 3 is pulled out to retain the channel 10 in the spiral steel bar, the lower precast concrete member 9 is hoisted, and the grout anchors the steel bar 2 is inserted into the channel 10, and the pre-embedded rod 3 after being pulled out can be reused, which reduces the manufacturing cost.

In this embodiment, the diameter of the slurry anchor reinforcement bar 2 is equal to the diameter of the straight reinforcement bar 1-1, and the lap length L between the slurry anchor reinforcement bar 2 and the pre-embedded reinforcement bar 1 is 15d, where d is the diameter of the slurry anchor reinforcement bar 2, The diameter of the tunnel 10 is 30mm-40mm, the overlapping length L of the grout anchor steel bar 2 and the pre-embedded steel bar 1 is equal to the height of the tunnel 10, and the height of the tunnel 10 is equal to the overlapping length L to ensure that the upper precast concrete member 8 and the connection strength between the lower precast concrete member 9.

During specific construction, as shown in Figure 3, a groove 3-1 is provided on the outer wall of the embedded rod 3 along the axial direction. Preferably, the groove 3-1 is helical, and the embedded rod 3 is pulled out. Finally, the shape of the inner wall of the channel 10 along the length direction is helical, and the helical shape can increase the roughness of the inner wall of the channel 10, increase the axial force of the grouting material 11 and the concrete in the upper prefabricated concrete member 8, and strengthen the anchorage of the grout anchor steel bar 2 effect, thereby increasing the connection strength between the upper precast concrete member 8 and the lower precast concrete member 9 .

During actual construction, the values of the lap length L and the height of the tunnel 10 can be adjusted accordingly according to specific requirements.

In this embodiment, the upper prefabricated concrete member 8 is provided with a grouting hole 7 and an exhaust hole 5 for discharging the air in the tunnel 10 .

During specific construction, as shown in Figure 3, after the pre-embedded steel bars 1 are positioned, the pre-embedded rods 3 are pierced in the tunnels 10 in the spiral steel bars, and the pre-embedded exhaust pipes 4 and the pre-embedded grouting pipes 6 are connected to the pre-embedded rods. 3. Lay vertically, pour the upper precast concrete member 8, and pull out the pre-embedded rod 3, pre-embedded exhaust pipe 4 and pre-embedded grouting pipe 6 after the upper precast concrete member 8 is initially set, and pre-embedded exhaust pipe 4 and pre-embedded grouting pipe 6 The corresponding air vent 5 and grouting hole 7 are formed after the buried grouting pipe 6 is pulled out.

In this embodiment, as shown in Figure 3, the pre-embedded exhaust pipe 4 and the pre-embedded grouting pipe 6 are vertically arranged with the pre-embedded rod 3 and both are PVC pipes, and the PVC pipe is light in weight and convenient operate.

In this embodiment, the grouting material 11 poured into the tunnel 10 is a non-shrinkage and micro-expansion cement-based grouting material, which has high fluidity, early strength, high strength, and micro-expansion. and other characteristics, it can be tightly occluded with the poured concrete, which increases the connection strength between the upper precast concrete member 8 and the lower precast concrete member 9, and increases the tensile strength of the joint.

The following steps are included when connecting the upper precast concrete member 8 and the lower precast concrete member 9:

Step 1: Installation of pre-embedded steel bar 1, pre-embedded rod 3, pre-embedded exhaust pipe 4 and pre-embedded grouting pipe 6:

Place the pre-embedded steel bar 1, the pre-embedded exhaust pipe 4 and the pre-embedded grouting pipe 6 at the corresponding installation positions in the forming formwork, and position the pre-embedded steel bar 1, and put the pre-embedded rod 3 through the channel in the spiral steel bar 10 in;

Step 2: Concreting of the upper precast concrete element 8:

The outer ends of the pre-embedded exhaust pipe 4 and the pre-embedded grouting pipe 6 are respectively blocked, and then concrete is poured to form an upper precast concrete member 8;

Step 3: Pull out the pre-embedded exhaust pipe 4, pre-embedded grouting pipe 6 and pre-embedded rod 3;

After the concrete of the upper prefabricated concrete member 8 to be poured is initially set, the pre-embedded exhaust pipe 4, pre-embedded grouting pipe 6 and pre-embedded rod 3 are sequentially taken out, and the pre-embedded exhaust pipe 4 and pre-embedded grouting pipe 6 are pulled out to form Corresponding to the vent hole 5 and the grouting hole 7, the pre-embedded rod 3 is pulled out to retain the channel 10 in the spiral steel bar;

Step 4: connecting the upper precast concrete member 8 and the lower precast concrete member 9;

Lift the lower precast concrete member 9, and insert the grout anchor steel bar 2 pre-buried in the lower precast concrete member 9 into the tunnel 10 from bottom to top, and carry out pressure grouting through the grouting hole 7 until the grouting material 11 overflows from the vent hole 5 After the grouting is completed, maintenance is carried out, that is, the connection between the upper precast concrete member 8 and the lower precast concrete member 9 is completed.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present utility model still belong to Within the scope of protection of the technical solution of the utility model.

Claims (5)

1. A prefabricated concrete component reinforcement grouting connection structure is characterized in that: it comprises a pre-embedded steel bar (1) and a grout anchor steel bar (2), the pre-embedded steel bar (1) is pre-embedded in the upper prefabricated concrete component (8), and the grout The lower part of the anchor reinforcement (2) is pre-embedded in the lower prefabricated concrete member (9), and the pre-embedded reinforcement (1) is composed of a straight reinforcement (1-1) and a curved reinforcement (1-2) in an integrated structure. The curved steel bar (1-2) is a spiral steel bar, and the upper part of the slurry anchor steel bar (2) is arranged in the channel (10) in the spiral steel bar, and the upper part of the slurry anchor steel bar (2) is connected with the prefabricated steel bar. The buried steel bars (1) are overlapped together, the tunnel (10) is poured with a grouting material (11), and the grouting material (11) is overlapped with the pre-embedded steel bar (1) and the grout anchor steel bar (2) Fasten and condense as one. 2. A prefabricated concrete member reinforcement grouting connection structure according to claim 1, characterized in that: the diameter of the grout anchor reinforcement (2) is equal to the diameter of the straight reinforcement (1-1). 3. A prefabricated concrete member reinforcement grouting connection structure according to claim 2, characterized in that: the lap length L=15d between the grout anchor reinforcement (2) and the pre-embedded reinforcement (1), where d is The diameter of the slurry anchor bar (2). 4. A prefabricated concrete member reinforcement grouting connection structure according to claim 3, characterized in that: the overlapping length L of the grout anchor reinforcement (2) and the pre-embedded reinforcement (1) and the tunnel (10) heights are equal. 5. A prefabricated concrete component reinforcement grouting connection structure according to claim 1, characterized in that: the upper precast concrete component (8) is provided with a grouting hole (7) and is used to discharge the air in the tunnel (10) vent holes (5).