CN101356318B - Precast concrete block with connection structure using steel pipes and connection structure thereof - Google Patents

Abstract

The present invention relates to precast concrete segments and their assembled structures. While supporting facile assembly, the inventive concrete segments provide sufficient resistance against shear force since they contain steel ducts, which also double as shear keys, for installing tendons. Herein is provided a precast concrete segment comprising a cylindrical steel duct placed therein such that said steel duct runs through said segment along the direction of assembly with a neighboring precast concrete segment, wherein said steel duct is installed with tendons therein to apply tension, and wherein the upper part of said steel duct protrudes from the top surface of said precast concrete segment so as to function as a shear key, and wherein the lower part of said steel duct comprises a socket having a widened diameter so as to allow the protruding upper part of a steel duct from the neighboring concrete segment to be inserted therein.

Description

Precast concrete block with connection structure using steel pipes and connection structure thereof

technical field

The invention relates to prefabricated concrete blocks capable of forming assemblies by means of steel pipes accommodated therein, and to said assemblies of these blocks. More particularly, the present invention relates to precast concrete blocks of novel construction and combinations thereof in which steel pipes are incorporated which also double as shear keys for the installation of tendons to provide shear resistance. Adequate resistance to stress and a convenient combination of blocks for the final structure.

Background technique

When combining precast concrete blocks, shear keys must be installed to provide shear resistance from the mechanical locking of the surfaces so that a shear connection can be established between discontinuous blocks. In precast concrete blocks, these shear keys are usually formed during their production as protrusions protruding from one side of the block. The above methods of producing concrete blocks with raised shear keys are prone to inadvertent damage to the shear keys during demoulding. This becomes a significant problem when the shear key is small and has long protrusions. Further, the fill of concrete is often insufficient for the portion of the mold where the shear key is formed, which results in blocks having an improperly formed shear key when demolded.

Meanwhile, when tendons are continuously disposed between two blocks to be connected, water leakage may occur through block discontinuities. Leakage of tendon installation holes at block discontinuities (i.e., joints between blocks) caused tendon corrosion, which also resulted in tendon damage; as a result, structural collapse, etc., could occur at the level of the entire structure serious problem. Therefore, during block assembly, special measures are required to prevent corrosion of tendons which are continuously arranged between two connected blocks.

Contents of the invention

The object of the present invention is to provide prefabricated concrete blocks in which shear keys (important elements that generate shear resistance between blocks) can be easily formed without Damage to precast concrete blocks in the process. Furthermore, an object of the present invention is to provide a precast concrete block in which, in an assembly of blocks, tendon corrosion in the block caused by leakage of water into spaces where tendons are continuously arranged can be prevented.

The above mentioned objects of the invention can be achieved by the precast concrete block of the invention. A precast concrete block is provided herein, comprising: a cylindrical steel pipe disposed in the precast concrete block such that the steel pipe penetrates the block in a direction of being combined with an adjacent precast concrete block, wherein , steel tendons are installed in the steel pipe to apply tension, and the upper part of the steel pipe protrudes from the top surface of the precast concrete block so as to serve as a shear key, and the lower part of the steel pipe includes Wide diameter casing to allow insertion of the projecting upper portion of the steel pipe of the adjacent concrete block.

In one embodiment of the invention, said projecting upper portion of said steel pipe comprises a tapered nipple in order to allow its easy insertion into the casing of an adjacent concrete block. In another embodiment of the present invention, said casing of steel pipe may be formed by fixing a steel conduit to the lower part of said steel pipe, wherein the inner diameter of said steel conduit matches the outer diameter of said steel pipe.

In another aspect of the invention, a block combination of two precast concrete blocks is provided. The precast concrete block includes a cylindrical steel pipe integrally formed therein, the steel pipe penetrating through the block in an assembly direction, wherein the steel pipe has an upper portion protruding from a top surface of the precast concrete block , and wherein the lower portion of the steel pipe includes a sleeve having a widened diameter so as to allow insertion thereinto of a projecting upper portion of the steel pipe of another concrete block, and wherein the projecting upper portion of the steel pipe is inserted into another concrete block located In the casing at the lower part of the block to form an integral block assembly connecting the two concrete blocks through the interpenetration of the steel pipes.

In one embodiment of the present invention, the steel pipe penetrating into the two concrete blocks is installed with steel tendons capable of applying tension, so as to realize the combination of the two blocks. In another embodiment of the invention, the block combination may include a sealing member mounted on the outer top surface of the block, wherein another precast concrete block is stacked above the sealing member, and wherein and injecting a grout material to fill a void created between the upper and lower blocks by the sealing member to form a grout portion between the upper and lower blocks.

In the present invention, sufficient shear resistance can be provided at the junction of adjacent precast concrete blocks by the steel pipe as the shear key. In particular, the formation of the shear bond is very easy since standard, integral shear bonds integral with the blocks can be utilized. In addition, since the steel pipe is continuously disposed between the two blocks to be connected, water leakage to the inside of the steel pipe through the joint of the blocks is prevented. Likewise, the concrete that makes up the blocks is reinforced. Overall, a neat looking concrete block can be obtained.

Description of drawings

With reference to the accompanying drawings, the above-mentioned objects and features of the present invention will become more apparent through the following detailed description of preferred embodiments of the present invention, in which,

Figure 1 is a perspective view of a precast concrete block of the present invention, wherein only the portion where steel pipes are installed is shown in the form of a rectangular block.

Figure 2 is a cross-sectional perspective view of the precast concrete block shown in Figure 1 with a portion of the concrete removed.

Figure 3 is a perspective view of the embodiment of the steel pipe shown in Figure 1 .

FIG. 4 is a cross-sectional perspective view of the steel pipe embodiment shown in FIG. 2 .

Figures 5 and 6 are a perspective view and a cross-sectional perspective, respectively, of another embodiment of a steel pipe according to the invention, wherein additional steel pipe is used to form the casing.

FIG. 7 is a schematic perspective view of a block equipped with steel pipes shown in FIG. 5 . Fig. 8 is a cross-sectional perspective view of the precast concrete block shown in Fig. 6 with a portion of the concrete removed.

Fig. 9 is a schematic cross-sectional perspective view showing the vertical assembly of the blocks shown in Fig. 2 .

Fig. 10 is a schematic cross-sectional perspective view showing the assembled blocks shown in Fig. 2 .

Fig. 11 is a schematic cross-sectional perspective view showing the vertical assembly of the blocks shown in Fig. 8 .

Fig. 12 is a schematic cross-sectional perspective view showing the assembled blocks shown in Fig. 8 .

Figure 13 is an exploded perspective view showing a block embodiment of the present invention wherein a precast concrete pier block is stacked on top of another block.

Detailed ways

Preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

Figure 1 is a perspective view of a precast concrete block 10 of the present invention, wherein only the portion where steel pipes are installed is shown in the form of a rectangular block. Figure 2 is a cross-sectional perspective view of the block shown in Figure 1 with some concrete removed. FIG. 3 is a perspective view of the embodiment of the steel pipe 1 shown in FIG. 1 , and FIG. 4 is a cross-sectional perspective view of the embodiment of the steel pipe 1 shown in FIG. 2 .

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2 , the steel pipe 1 arranged inside runs through a precast concrete block 10 (hereinafter referred to as “block”) for establishing a shear connection along the direction of the composite block 10 . The steel pipe 1 is a cylindrical steel conduit through which tendons are placed to provide tension.

As shown in the figure, the lower part of the steel pipe 1 at the same height as the bottom surface of the block 10 does not protrude outwards, while the upper part of the steel pipe 1 protrudes from the top surface of the block 10 . As described below, during the combination of adjacent blocks 10, the protruding upper portion of the steel pipe 1 is inserted into the lower portion of another steel pipe 1, which is bonded to the adjacent block through the bottom surface of the adjacent block 10. 10 in. In order to ensure easy insertion of said steel pipe 1 between said adjacent blocks 10 , the lower part of said steel pipe 1 preferably comprises a sleeve 11 with a widened diameter as shown in FIGS. 3 and 4 . In addition to the casing 11 described above, the upper part of the steel pipe 1 may include a pipe joint 12 with a gradually decreasing diameter. Although the sleeve 11 is formed by machining in the steel pipe 1 shown in FIGS.

As another embodiment of the steel pipe 1 of the present invention, Figures 5 and 6 show a perspective view and a cross-sectional perspective view, respectively, of a steel pipe 1 with a sleeve 11 formed by fixing individual steel pipes as explained above. A schematic perspective view of a block equipped with steel pipes 1 shown in FIG. 5 is provided in FIG. 7 . FIG. 8 is a schematic perspective view of a cross section formed by removing a portion of concrete from the precast concrete block shown in FIG. 6 . As shown in Figures 5 and 6, the lower part of the steel pipe 1 can be fastened to another steel pipe with a larger diameter, for example by welding or screwing (threaded holes are on the outer surface of the lower part of the steel pipe and have a larger diameter The inner part of the steel pipe is formed for screwing) to form the sleeve 11 thereon. The steel pipe 1 described above with the sleeve 11 formed by the individual steel pipes being fixed may also include a pipe joint 12 tapered at the top.

It should also be pointed out that, although not shown in the figures, the steel pipe 1 may be subjected to a treatment to roughen its surface or be provided with elements such as bolts which may be inserted into the concrete block 10 in order to reinforce the The fixing of the steel pipe 1 and the block 10 is described.

The assembling process and assembling structure of those blocks 10 equipped with steel pipes 1 as described above are explained below.

FIG. 9 is a schematic cross-sectional perspective view showing the vertical assembly of the blocks 10 shown in FIG. 2 . Fig. 10 is a schematic cross-sectional perspective view showing a composite block. FIG. 11 is a schematic cross-sectional perspective view showing the vertical assembly of the blocks 10 shown in FIG. 8 . FIG. 12 is a schematic cross-sectional perspective view showing the composite block shown in FIG. 8 .

As shown in the figure, during the combination process of the above-mentioned adjacent blocks, the protruding part of the steel pipe 1 protruding from the side of the block 10 in which the steel pipe 1 is installed (that is, the pipe joint 12) is inserted into the set In the casing 11 of another steel pipe 1 inside the adjacent block 10 . Multiple blocks 10 are assembled sequentially in the manner described above to make the final structure.

In the composite structure mentioned above, the steel pipe 1 can be used as a shear key to provide resistance against shear force at the joint of two blocks 10, because the steel pipe 1 spans across the joint. Install on two building blocks 10. In particular, the assembly of blocks 10 and the connection between the steel pipes 1 can be made considerably easier because the steel pipes 1 are equipped with casings 11, as explained before. In summary, it is generally the case with precast concrete blocks of the prior art that when the shear key is formed as an extension protruding from the same concrete material as the block, during the manufacture of the block such things as damage resistance Shear key or produce incomplete shear key and other problems. In the present invention, since the steel pipe 1 is used to form the shear key, the above-mentioned problem is no longer a problem. Further, one only needs to install the steel pipe 1 during the process of manufacturing the block 10 , which greatly simplifies the production of the shear key and improves the productivity of the block 10 .

At the same time, it should be pointed out that, in addition to serving as a shear key, the steel pipe 1 can also be used as an installation hole for setting a tendon (not shown). As mentioned above, a plurality of blocks 10 can be combined, and steel pipes 1 therein can then be installed with tendons to provide tension to the entire structure. Therefore no additional tubes are required.

Therefore, since the inserted steel pipe 1 forms a continuous connection across the two blocks 10 in the assembly to form a watertight seal, water leakage to the inside of the steel pipe 1 through the junction between the blocks 10 can be prevented in the present invention.

Figure 13 illustrates an example of said block 10, wherein a precast concrete pier block is placed on top of another precast concrete pier block in an exploded perspective view. In order to form a single structure, in the stack of blocks 10 of the present invention, grout can be injected to adjust the gaps between the blocks 10 . As shown in FIG. 13, a sealing member 21 having a length corresponding to the required clearance of the block 10 can be fixed to the top outer surface of the lower block 10, and then the upper block 10 is stacked. The gap between the upper and lower blocks 10 formed by the sealing member 21 may be injected with a grout material such as non-shrink mortar to form a grout portion so that the gap or level between the blocks 10 can be adjusted. Therefore, preferably, the grout material is injected to adjust the gap before the steel tendon is installed inside the steel pipe 1 to apply tension.

As shown in FIG. 13 , the sealing member 21 can also be installed around the steel pipe 1 . In this case, preferably, the injection and filling of the grout material in the gap between the sealing member 21 and the steel pipe 1 occurs after the tendons are installed inside the steel pipe 1 to apply tension.

While precast concrete piers are provided as examples of blocks 10 of the invention, the scope of the invention is not meant to be limited thereto; blocks 10 of the invention may be considered to include various uses for upper structural blocks for bridges.

Industrial Applicability

As mentioned above, in the present invention, since the above-mentioned steel pipe is straddled on the two blocks at the junction, the steel pipe can be used as a shear key to provide resistance to shear force at the junction of two precast concrete blocks resistance. In particular, the steel pipes are installed in predetermined positions, followed by concrete pouring to form the precast concrete blocks of the present invention. The production of the shear key is facilitated because the blocks described above enable a complete, functional shear key to be formed as an integral part of the block. Furthermore, since the steel pipes are continuously provided across the joint between two blocks, water leakage to the inside of the steel pipes through the joint of blocks can be prevented. The steel pipes used also reinforce the concrete in the blocks. Overall, it is possible to produce concrete blocks with a clean appearance.

Claims (7)

1. A prefabricated concrete block (10), comprising: a cylindrical steel pipe (1) arranged in the prefabricated concrete block (10), so that the cylindrical steel pipe (1) is along the adjacent prefabricated The direction of the concrete block combination runs through the prefabricated concrete block (10), wherein steel tendons are installed in the cylindrical steel pipe (1) to apply tension, and the upper part of the cylindrical steel pipe (1) is connected from the The top surface of the precast concrete block (10) protrudes to serve as a shear key, and the lower part of the cylindrical steel pipe (1) includes a sleeve (11) with a widened diameter to allow adjacent precast The protruding upper part of the cylindrical steel pipe (1) of the concrete block is inserted into it. 2. Precast concrete block according to claim 1, characterized in that the protruding upper part of the cylindrical steel pipe (1) comprises a tapered pipe joint (12) in order to allow its easy insertion into the adjacent Sleeves (11) for prefabricated concrete blocks. 3. Precast concrete block according to claim 1 or 2, characterized in that the casing of the cylindrical steel pipe (1) is formed by fixing a steel conduit to the lower part of the cylindrical steel pipe (1) (11), and the inner diameter of the steel conduit matches the outer diameter of the cylindrical steel pipe (1). 4. The precast concrete block as claimed in claim 1 or 2, characterized in that, a sealing member (21) is installed on the outer top surface of the precast concrete block (10), so that when another precast concrete block is piled up, A void is created between the upper and lower precast concrete blocks in order to inject the grout material into the void. 5. A block combination of two prefabricated concrete blocks (10), The precast concrete block includes a cylindrical steel pipe (1) integrally formed therein, and the cylindrical steel pipe (1) penetrates the precast concrete block (10) in a direction of being combined with an adjacent precast concrete block , wherein the cylindrical steel pipe (1) has an upper portion protruding from the top surface of the precast concrete block (10), and wherein the lower part of said cylindrical steel pipe (1) comprises a casing (11) with a widened diameter to allow the protruding upper part of another precast concrete block cylindrical steel pipe (1) to be inserted thereinto, and Wherein, the protruding upper part of the cylindrical steel pipe (1) is inserted into the casing (11) located at the lower part of another prefabricated concrete block to form mutual penetration through the cylindrical steel pipe (1). The integrated precast concrete block assembly connecting the two precast concrete blocks. 6. The block assembly of two prefabricated concrete blocks as claimed in claim 5, characterized in that, the cylindrical steel pipes (1) penetrating into the two prefabricated concrete blocks (10) are equipped with steel pipes capable of applying tension. tendons to achieve the combination of the two precast concrete blocks. 7. The block combination of two prefabricated concrete blocks as claimed in claim 5 or 6, comprising: a sealing member (21) installed on the outer top surface of the prefabricated concrete block (10), wherein another prefabricated concrete block is stacked above said sealing member (21), and Wherein, the grout material is injected to fill the void created by the sealing member (21) between the upper and lower precast concrete blocks to form a grout portion between the upper and lower precast concrete blocks.

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