JPS5843543B2 - How to join concrete members - Google Patents

Description

[Detailed Description of the Invention] Conventionally, when joining concrete members, the end surfaces of the members to be joined are finished with high precision so that they come into close contact with each other, epoxy adhesive is applied to the same surfaces, and the members and the joint surfaces are pre-finished. A method of introducing and integrating stress was being implemented.

In this case, in order to improve the precision of the end surface, it is necessary to machine finish the end surface or use a method such as match casting, which requires a great deal of expense.

In addition, the work time for applying and bonding epoxy adhesives is limited because the adhesive has a pot life.
It requires rapid construction and has the disadvantage of low heat resistance.

The present invention has been proposed in view of the above circumstances, and involves installing a pair of concrete members with a channel-shaped cross section with an open upper surface facing each other with a predetermined gap between them, and then inserting a pair of concrete members into each inner peripheral surface of the two concrete members with a predetermined gap between them. A net-like or sheet-like reinforcing material is provided across the gap and between each outer peripheral surface, and a time-hardening resin is applied to the surface of the reinforcing material to form an inner and outer formwork surrounding the gap. and then filling a gap formed between the end faces of the two members and the formwork with cement-based mortar and introducing prestress across the two members. Person in charge,
The aim is to provide an improved method for joining concrete members, which does not require precise end finishing of the members, the filler is highly heat resistant and the joining operation is facilitated.

According to the method of the present invention, concrete members are joined with a required gap, so there is no need for precision of the end faces of the members, and the joining filler filled into the gap is almost the same as the material of the members. Since cement-based mortar, which is a physical material, is used, it is possible to structurally integrate the two components, and the filler not only has excellent heat resistance, but also has no restrictions on filling time, making it easy and reliable. The joining work was carried out in
Furthermore, there is an advantage that the cost is lower than the conventional method in which a resin-based adhesive material is used for the joint portion.

Further, according to the present invention, as described above, a pair of concrete members with a channel-shaped cross section with an open upper surface are placed opposite each other with a predetermined gap, and then between each inner circumferential surface and each outer circumferential surface of the two concrete members. A net-like or sheet-like reinforcing material is provided to span the gap, and a time-curing resin is applied to the surface of the reinforcing material to form an inner and outer formwork surrounding the gap. Since cement mortar was filled between the end faces of both members, a flexible reinforcing material was attached to both members and a resin with high plasticity and adhesiveness was applied while forming the formwork. Therefore, even if there is an unevenness on the surfaces of the two concrete members, formwork can be immediately installed to accommodate the unevenness, workability is improved, formwork of any shape can be easily constructed, and it is water resistant as a formwork material. By using a flexible material, it is possible to protect the joint and improve water-stopping properties.

Further, according to the method of the present invention, there is no need for crimping for joining concrete members, so that prestress can be introduced at once by introducing cement mortar into the joint of the members.

In the present invention, the shear strength of the joint can be improved by providing a recess in the joint end face of the concrete member and filling the recess with the filler to integrate the parts.

The present invention will be described below with reference to the illustrated embodiments.

A is a concrete member with a channel-shaped cross section with an open top end.
A recess 1 for increasing shear strength is provided on each of the joint surfaces at both ends, and a sheath 2 is passed through the member in the axial direction.

The end of the sheath 2 that protrudes from one joint surface is connected to a large-diameter male joint 2a, and the end that projects from the other joint surface is connected to a female joint 2c with a putty-like seal 3 layered on the outer periphery of the main body. It is formed.

(See Figures 3 to 5) In the present invention, the concrete member A is
While maintaining a gap of ~30 mm so that the overall length is the specified dimension, and so that the individual members A do not bend, and the overall length and height are not bent, adjust the first part. They are arranged on a support base B as shown in FIGS. 1 and 2.

In this process, the joint portions of the sheath 2 are connected.

That is, by bringing the members A closer together, the male joint 2a of the sheath 2 in one member A bites into the putty-like seal 3 of the female joint 2b of the sheath 2 in the adjacent other member A, and the male and female parts are separated. Both joints 2a and 2b are connected.

The putty-like seal 3 hardens over time and maintains the watertightness of the joint between the two sheaths 2.

(See Figure 6) Figures 7 to 9 show concrete member A.
Another embodiment is shown in which a rubber ring 4 longer than the member gap is shown.
is adhered to one end surface of the member so as to be located on the same axis as the sheath 2, and when the gap between the members is made to match a predetermined dimension, the rubber ring 4 is compressed and the sheaths 2 of both members A are connected.

As mentioned above, when the connection of the sheaths 2 of adjacent concrete members A is completed, the inner and outer surfaces of the gap between the two members are closed.
As shown in FIGS. 10 and 11, an epoxy adhesive 5 is applied to both the inner and outer surfaces of the joint end of the concrete member A, and then a glass fiber fabric 6 is pasted thereon.
(See Figures 1 and 13) Furthermore, epoxy adhesive is applied thereon.

In the illustrated embodiment, only one layer is formed, but the above-mentioned operations are repeated as necessary to construct a multilayer reinforced plastic inner and outer mold 7.

(See FIGS. 14 to 16) Instead of the reinforced plastic mold 7, the mold may be made by pasting multiple layers of gummed tape to the inner and outer peripheral surfaces of the member.

Next, as shown in FIGS. 14 to 16, cement mortar 8 is poured from above into the gap between member A partitioned by the inner and outer forms 7 at a speed that does not allow air to accumulate in the gap.

FIG. 17 shows the mortar filling operation state, and numeral 9 indicates a mortar container.

When the work of pouring mortar into one member gap is completed, the work of filling mortar into the member gaps partitioned by the formwork 7 is sequentially performed, and all the member gaps are filled with mortar.

At this time, as shown in FIGS. 19 and 20, mortar 8 is filled into the joint end face recess 1 of member A, and after hardening, the filled mortar acts as a cock to increase the shear strength of the joint of the members.

In the illustrated embodiment, the concrete member A is all laid out in advance.
After that, mold forming and mortar filling operations are performed, but the series of operations of arranging members A one by one, forming a mold, and filling mortar may be repeated.

When the filling mortar 8 hardens and reaches a predetermined strength, P
The C cable 10 is inserted through the entire sheath 2, one end is anchored to the concrete member A, and the other end is tensioned with a hydraulic jack to impart a predetermined tension force to introduce prestress to the member A and the joint. .

When the tensioning work is completed, cement mortar is injected into the sheath 2, and as the mortar hardens, all the members A are completely integrated, and the joining work of the concrete members is completed.

(Refer to FIGS. 23 to 25) When inserting the PC cable 10 into the sheath 2, there are cases where the insertion is carried out while the members A are being arranged, and cases where it is carried out after the members are arranged.

In addition, there are cases where the joints are joined and integrated by simply filling cement mortar without introducing prestress into the joints.

In this case, as shown in FIGS. 26 and 27, a required number of pairs of elongated holes 11 facing each other are provided on the joining end surfaces of both members A to be joined, and reinforcing bars 12 are inserted between the opposing elongated holes 11 when the members are arranged.
is inserted.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various designs without departing from the spirit of the present invention. .

[Brief explanation of drawings]

Figures 1 and 2 are a side view and a plan view, respectively, showing the state in which concrete members are arranged, and Figures 3 and 4 are a view II-IN and a view II-IN in Figure 2, respectively. , Figure 5 is the fourth
6 is a cross-sectional plan view showing the sheath joint, FIG. 7 is a front view showing another example of the concrete member, FIG. 8 is a longitudinal sectional view thereof, and FIG. 9 is a cross-sectional view showing the sheath joint. 10 and 11 are side and front views, respectively, showing the state in which the adhesive is applied to the joints of the members, and FIGS. 12 and 13 are the cross-sectional views, respectively, of the sheath joints. FIG. 14 is a side view and a front view showing a state in which a glass fiber fabric is attached to the joint portion of the members; FIG. 14 is a cross-sectional plan view showing a state in which a formwork is formed at the joint portion of the members; FIGS. 15 and 16 The figures are number 14.
Arrow view X■X■Figure and arrow view XVI -
FIG. 7 is a side view showing the cement-based mortar filling operation for the joint, FIG. 18 is a plan view of the member joint after mortar filling has been completed, and FIGS. 19 and 20 are longitudinal side views thereof. Figures 21 and 22 are a side view and a plan view, respectively, of a group of concrete members after mortar filling work has been completed, and Figures 23 and 24 are a side view and a plan view, respectively, of a group of concrete members when the joining work is completed. Figure 25 is the second
4, FIG. 26 is a longitudinal cross-sectional side view of a joint of concrete members joined by another embodiment of the method of the present invention, and FIG. 27 is a view taken from arrow XX-- in FIG. 26.
Figures XX and 28 are plan views of the joint portion. A... Concrete member, 2... Sheath, 5... Epoxy adhesive, 6...
Glass fiber fabric, 7...Formwork, 8...
...Cement mortar, 10...PC cable.

Claims (1)

[Claims] 1. A pair of concrete members with channel-shaped cross sections with open tops are installed opposite each other with a predetermined gap, and then a net-like or A sheet-like reinforcing material is provided, and a time-curing resin is applied to the surface of the reinforcing material to form an inner and outer formwork surrounding the gap, and then between the end faces of both members and the formwork, A method for joining concrete members, characterized by filling the formed void with cement-based mortar and introducing prestress across both members.