CN211572000U

CN211572000U - Overlap joint, grout monitoring element and concrete structural member

Info

Publication number: CN211572000U
Application number: CN201921183348.3U
Authority: CN
Inventors: 梁惠文
Original assignee: Bama Dana Construction And Engineering Co ltd
Current assignee: Bama Dana Construction And Engineering Co ltd
Priority date: 2019-03-21
Filing date: 2019-07-25
Publication date: 2020-09-25
Anticipated expiration: 2029-07-25
Also published as: CN111719709B; CN111719707A; CN211572006U; SG11201913639UA; SG11201913640UA; CN111719709A

Abstract

The utility model discloses a lap joint is used for between concrete structure and with its overlap joint concrete structure. The lap joint comprises a first concrete structure body with a first shape space formed beside a first steel bar; a movable rebar is placed in the entire first shaped space; a second concrete structure is disposed adjacent the first concrete structure and has a second reinforcement disposed adjacent the second space. The second space is substantially coaxially disposed with respect to the first shaped space. One part of the movable steel bar is placed in the first shaped space, and the other part of the movable steel bar is placed in the second shaped space. Therefore, the movable steel bars are overlapped on the first steel bars and the second steel bars, and then space grout containing the steel bars is filled through the alignment of the steel bars. Additionally, the utility model discloses a detector for detecting whether grout fills up the pipe.

Description

Overlap joint, grout monitoring element and concrete structural member

Technical Field

The utility model provides a plurality of techniques of connecting the concrete structure, it supplies prefabricated component can fast assembly in the building site, can use together, forms a systematic execution technique, can be totally, rapidly and simply in the building site equipment component.

Background

A precast concrete structure is a structure widely used by modern buildings to rapidly construct multi-story buildings such as high-rise buildings and office buildings. Precast concrete structures are produced off-site, such as a factory. Precast concrete structures often use reinforcing steel bars that extend outward from the structure to connect the reinforcing steel bars of adjacent structures.

One common construction method for joining prefabricated structures is corrugated steel pipe grouting, which penetrates:

1. placing a metal corrugated sleeve on the end part of the precast concrete element to form a hollow conduit or forming a hole space by other methods;

2. from another prefabricated or cast-in-place concrete element there extend a reinforcement (for example a bar), called connecting reinforcement, the length of extension being called the anchoring length, which is determined according to the size of the reinforcement, the anchoring length of a reinforcement with a diameter of more than 25 mm usually exceeding 1 metre;

3. when the prefabricated element is placed at the final position, all the connecting steel bars are inserted into the metal corrugated pipe;

4. using non-shrinkage cement paste to fill the space between the steel bar and the metal corrugated pipe until the cement paste overflows the grouting outlet hole, and completing structural connection;

5. after the completion, the main reinforcing bar among the prefabricated component forms the overlap joint with the connecting reinforcement among the metal bellows, and the pulling force and the pressure of main reinforcing bar can transmit the connecting reinforcement, so two structural component can link together.

The disadvantages of the above-described connection system are:

1. the concrete elements extend over a length of reinforcement, whether 400 mm or more than a meter, which is very long, and precise alignment is necessary to make it difficult to insert the connecting reinforcement into the metal bellows of another prefabricated element. The exposed connecting bars are easily bent during transportation and are misaligned to make installation difficult, and often the person working on the site must adjust the connecting bars back to the correct position.

2. The extended reinforcement increases the length of the overall prefabricated element, increases the space required for transportation, and thus reduces the efficiency of transportation.

3. For high-rise buildings, the content of the steel bars of the wall columns is high, a large number of connecting steel bars are needed, and it is difficult to insert all the connecting steel bars into the metal corrugated pipes in an aligned mode.

4. The metal corrugated pipe has the function of forming a shape space for inserting the connecting reinforcing steel bars, and has no structural function after grouting. The prefabricated structure requires the use of many metal bellows, which is wasteful of material.

5. The grouting method determines that the space between the steel bar and the metal corrugated pipe is full by taking cement slurry overflowing out of the grouting outlet hole as an index, wastes overflowing cement slurry and is not favorable for environmental management of a construction site.

Accordingly, there is a need for improved techniques for joining concrete structures, such as prefabricated walls, columns, beams and slabs, to achieve faster and safer construction, and to reduce transportation costs and simplify the construction of the joint.

Disclosure of Invention

The utility model discloses an aspect provides a connection structure of improvement concrete structure body (for example precast concrete structure), include:

a first tangible space formed in the first concrete structure, the first tangible space being disposed adjacent to a first main reinforcement of a first concrete structure;

a movable bar placed in the first tangible space, the movable bar having a length shorter than a length of the first tangible space such that the movable bar is fully contained within the first tangible space;

a second concrete structure positioned adjacent to the first concrete structure, the second concrete structure including a second shaped space adjacent to a second primary rebar of the second concrete structure, the second shaped space positioned substantially coaxial with the first shaped space of the first concrete structure,

wherein moving said movable reinforcement to a position such that a portion of said movable reinforcement is within said first shaped space and a portion is within said second shaped space, thereby allowing said movable reinforcement to partially overlap the primary reinforcements of said first and second primary reinforcements; and

and grouting the first tangible space and the second tangible space with grout.

In one embodiment, centering said movable rebar within said first shaped molding space is achieved by positioning a centering element beside and above said movable rebar; the neutral element can be a metal spring coil.

In another embodiment, a lead is used to hold the movable rebar in the first shaped space.

In another embodiment, the slurry is received by using a bore conduit disposed between the first shaped space and a side of the first concrete structure; wherein, by using a lead, one end of the lead passes through the hole guide pipe to hold the movable steel bar in the first shaped space.

In another embodiment, the slurry is received by using a bore conduit disposed between the first shaped space and a side of the first concrete structure. In this embodiment, the method may further comprise using a wire having an end passing through the bore guide to hold the movable rebar in the first shaped space. The lap joint may further include a second shaped space disposed between the second shaped space and one side of the second concrete structure. The lap joint may further include a grout monitoring member disposed in the grout path of the second shaped space, the grout monitoring member providing an indication of completion of grout and preventing grout from escaping. In a particular embodiment, the grout monitoring element is followed by a plurality of grout passages and the monitoring element surface has a plurality of perforations, the width of the plurality of grout passages narrowing as they approach the monitoring surface; additionally the grout monitoring element surface may be transparent.

In another embodiment, the second tangible space of the second concrete structure may be replaced by a mechanical joint, facing the first tangible space of the first concrete structure. In this embodiment, when the second shaped space of the second concrete structure is replaced by the mechanical coupler, the movable reinforcing bar and the mechanical coupler are respectively provided with threads, and the reinforcing bar is screwed into the mechanical coupler by moving and rotating the reinforcing bar.

In another embodiment, the inner former is formed by a combination of one or more round, square, or other shaped rods; the molding polymerization anti-sticking layer surrounds and covers the internal former in a roughly spiral mode, the internal former is pulled out after concrete is poured, and finally the anti-sticking layer is pulled out to form a shaped space in the concrete structure body.

The utility model discloses the second aspect relates to a grout monitoring element who uses when being applied to prefabricated structure grout, include:

a housing connected to a bore conduit;

a tray body which covers the shell and is provided with a plurality of small holes, the back of the tray body is provided with one or a plurality of grouting channels for flowing slurry,

wherein the holes are sized to allow air to pass through but not the slurry.

In one embodiment, the grout monitoring element is placed at the grout exit hole and on the critical path of the grout to enable observation of the progress of the grout.

In another embodiment, the grout monitoring element provides an indication of grout completion to prevent grout spillage.

In another embodiment, the width of the plurality of grout channels narrows as they approach the monitoring surface; additionally the grout monitoring element surface may be transparent.

In another embodiment, the housing is made of plastic or metal.

In another embodiment, the tray is made of plastic.

The utility model discloses the third aspect relates to a concrete structure who forms tangible space or hole pipe in concrete structure through inside former, include:

the method comprises the steps of using an inner former formed by combining one or more round rods, square rods or other rod members, wrapping the inner former around the inner former in a roughly spiral pattern with an anti-sticking layer, pulling out the inner former after concrete is poured, and finally pulling out the anti-sticking layer to form one or more shaped space or hole conduits in the concrete structure.

In one embodiment, the material of the anti-sticking layer is plastic, Teflon, or silicone strip or steel cable.

Drawings

FIG. 1 is a schematic view of a first concrete element and a second concrete element having a plurality of shaped spaces formed at their ends for vertically connecting the ends of the two concrete elements by a prefabrication or cast-in-place forming according to an embodiment of the present invention;

FIG. 2 is a schematic view of the end portions of two concrete elements being joined in a horizontal or non-vertical connection according to an embodiment of the present invention;

fig. 3 shows another embodiment of the present invention, which connects two precast concrete elements by a set of mechanical joints for reinforcing steel bars and reinforcing steel bars with threads provided at ends thereof, and rotating the reinforcing steel bars inserted into the shaped spaces into the mechanical joints;

fig. 4 shows the shaped space corresponding to the reinforcing steel bar of the present invention;

fig. 5 shows a schematic diagram of the present invention using an internal former to form a shaped space with a surround.

FIG. 6 shows an embodiment of the present invention showing the status of grout fill by a grout monitoring element located at the grout outlet hole (top position);

fig. 7 shows an enlarged sectional view of the grout monitoring element of fig. 6 at the grout outlet hole.

Detailed Description

The utility model discloses a new-type precast concrete structure system, it is used for avoiding above-mentioned connecting reinforcement to extend the problem of structure. The utility model is suitable for a single precast concrete component includes post, wall, bracing, roof beam and board or other large-scale structures like the concrete module. In the technology of the present invention, the space for placing the connecting steel bar (e.g. straight steel bar) is provided temporarily in the prefabricated element. Generally, the prefabricated elements do not have the connecting rebars extending beyond the ends of the structural member.

Referring to fig. 1-2, a plurality of shaped spaces 1 are formed at one end of a first concrete element by a prefabrication or casting method. The shaped space 1 can be formed by conventional means such as a metal bellows, a hole pattern, or by using an internal former to wrap the surrounding layer as disclosed in the present invention. There is a shaped space 1 arranged adjacent to the main reinforcement 8 of the concrete element. Another set of shaped spaces 2 is formed at one end of a second concrete element. The first concrete element is firstly placed at a final set position; when cast in situ, the first concrete element is cast preferentially. When the ends of the two concrete elements are joined, the two sleeves are positioned opposite to each other according to the design. Before the second precast concrete element is installed, the connecting reinforcement 3 is inserted into the shaped space corresponding to the first or second precast concrete element. As shown in the figure, the connecting steel bar 3 is placed in the shaped space 2, or can be placed in another shaped space.

For horizontal element attachment, as shown in fig. 2, the attachment bar 3 may be positioned away from the open end having the shaped space by securely attaching a lead 5 or other suitable connector to one end of the bar 3. The lead 5 passes through the shaped space 2 and out of the joint between the two concrete elements. Sometimes, it is necessary to place centering devices 4 at intervals along the length of the connecting reinforcement to allow the connecting reinforcement 3 to be fixed in the center of the shaped space. The centering means 4 may be a metal spring coil fixed along the steel bars. The metal spring coils are chosen for their flexibility, low cost and slurry circulation characteristics, however, any other means of centering the movable rebars may be chosen.

The second prefabricated element is placed in a hanging mode, so that the shape spaces of the two elements can be matched and positioned; generally, the two shaped spaces are substantially coaxial.

For vertically connected prefabricated elements, the connecting bars may be temporarily supported in the upper element and inserted into the shaped spaces of the lower prefabricated elements by moving down the leads holding the connecting bars 3 by releasing them. The connecting reinforcement 3 will fall into the shaped space of the prefabricated element below.

For the prefabricated elements connected horizontally or non-vertically (for example, connected obliquely), as shown in fig. 2, under the condition that the connecting steel bar cannot be moved by gravity, the connecting steel bar can be moved into the shaped space of the opposite prefabricated element by pulling a lead wire which is firmly fixed on the end of the connecting steel bar and penetrates through the joint between the two prefabricated elements (as shown in fig. 2). It is also possible to move the connecting reinforcement temporarily placed in the shaped space 2 to the shaped space 3 by pushing one end of the reinforcement from an aperture (orifice) 7 by means of a flexible rod or device, the aperture 7 being the hole provided by the prefabricated element for the grouting operation. The length of the connecting bars is designed in consideration of the length 9 of the connecting bars which still has sufficient overlap with the main bars 8 when they are pulled or dropped to the final position. After the non-shrink cement is poured into and fills the connected shaped spaces, the connecting reinforcing steel bars can be effectively overlapped with the main reinforcing steel bars in the prefabricated elements. The compressive and tensile forces of the primary rebar can be transmitted to the grouted rebar through adhesive forces.

Referring to fig. 3, another aspect of the present invention is to provide a plurality of reinforcing bars 8 poured on the ends of the first concrete element. The ends of the reinforcing rods 8 are provided with threads for connection to a mechanical connector 9. The mechanical splice 9 has an open exposed end for connection to another threaded steel bar. A set of shaped spaces 10 is formed at one end of the second concrete element, at least one of which is prefabricated. The shaped space 10 may be formed by conventional means, such as by using metal bellows, hole molds, or the like, as described below. The shaped space is formed next to the main reinforcement 11 near the concrete element.

The first concrete element is placed in advance at a predetermined position. The mechanical joint is cast in the first concrete element. As known to those skilled in the art, the concrete element may also be cast into the second concrete element. If one of the elements is cast in place rebar, it is placed first. The position of the shaped space 10 is set in such a way that when the ends of the concrete elements are joined, the concrete elements are arranged in a position corresponding to the position of the connector 9.

Before positioning the second preform again, the connecting reinforcement 12 is inserted into the shaped space 10 of the concrete element. The connecting bar 12 is held in place by a lead wire secured to its end. The connecting rebars 12 are positioned equidistantly along the length of the rebars by one or more centering devices (centering devices) to maintain the rebars in the center of the shaped space.

The second precast element is placed so that it has a shaped space aligned with the mechanical joint, maintaining a gap 13 of about 20 mm at the end joint of the two concrete elements. The temporarily held rebar is then pushed 20 mm clearance to the touch mechanism connectors by pushing one end of the rebar through a flexible rod or device from an aperture (conduit)14, which aperture 14 is the hole provided by the prefabricated element for grouting operations. A wrench is sized to extend into the space 13 for rotating the connecting reinforcing bar 12 with threads into the mechanical joint. The length of the connecting reinforcing bars 12 is set to a length sufficient to overlap the main reinforcing bars 11 when they are fully locked into the mechanical splice.

Finally, non-shrink cement is poured to fill the connected shaped spaces 10 and the gap 13 between the two prefabricated elements. The connecting reinforcing bars 12 and the main reinforcing bars 11 form effective lap joints in the concrete element, and the compressive force and tensile force of the main reinforcing bars 11 of the first concrete element can be transmitted to the connecting reinforcing bars 12 through adhesive force. The internal forces can also be transmitted to the second concrete element main reinforcement 11 and other concrete elements through mechanical joints. The structural connection of the two elements is completed as described above.

The utility model provides a new scheme has following advantage:

1. the problem that the steel bars extend out of the prefabricated elements can be avoided. The transportation is more efficient, and the cost is reduced.

2. Compared with the conduit with the long steel bar inserted into the hole, the new proposal only has the advantage that the shape space is relatively simple to align on site.

3. With current technology it is difficult to apply the connection to inclined prefabricated construction elements because it is difficult to lift heavy prefabricated elements at an angle to allow an elongated steel bar to be inserted into the bore hole duct. The utility model discloses a connection structure can solve such problem, can be applicable to the component of roof beam, post, board and slope.

4. Through using the utility model discloses, basic structural element such as spliced pole, wall, bracing, roof beam and board can accomplish the construction of whole building.

5. The joining of the prefabricated elements has only about 20 mm clearance for construction tolerances and the construction site does not need to use any formwork or cast concrete.

6. The construction method does not need on-site modeling, steel bar binding or concrete pouring, only needs the connection operation of the prefabricated elements, accelerates the construction time and greatly reduces on-site construction personnel.

7. All the reinforcement bars can be bound in a factory, so that the loss of materials can be reduced, and the carbon footprint generated by transportation is greatly reduced.

8. The covered building is assembled by prefabricated elements, and only cement mortar joints are arranged among the prefabricated elements. Therefore, the facing brick, the bare concrete, the colored concrete and the like can be finished in a factory, and only the connection operation needs to be finished on a construction site.

As shown in fig. 4 and 5, the formation of the shaped spaces provided corresponding to the reinforcing rods is described as follows. As shown in fig. 4. A pin/rod as an internal former 1(internal former), which may be a steel bar, a cylinder or a round steel tube; other shapes can be achieved by combining a plurality of steel bars with a round steel tube. The inner former is provided with a layer of grease or oil. A polymeric anti-adhesive layer is annularly wrapped from an inner end portion to an outer end portion of the inner former 1 in a roughly spiral pattern as an anti-adhesive surrounding layer (wrapper), which may be made of plastic, Teflon or silicone strip (silicone) 2. Alternatively, the inner former 1 may be wound using steel cables as the strips, and a hole of arbitrary cross-sectional shape may be formed by stacking a plurality of strips. The surrounded former is placed in a mould and poured into the precast concrete element 3. When the cement has hardened, the inner former 1 is extracted from the pre-cast element. Since the lubricated inner former has a much lower friction with the surrounding layer (wrapper) than between the surrounding member and the concrete, the inner former 1 can be pulled out easily, leaving the polymeric anti-adhesive layer in the concrete. The polymeric release layer may be formed by extrusion and may be contoured to provide ribs or other structures that further reduce friction (as shown in fig. 5). The contact of the profile of the bar with the concrete is designed to promote the subsequent transfer of the adhesive force between the steel reinforcement and the concrete.

When the inner former is removed, the strip of the surround exposed at the open end can be withdrawn from the shaped space, the strip can be gradually stripped from the inner surface of the concrete element as the surround is helically wound, and the outline of the aperture 6 is moulded into the precast concrete element. The profile of the strip-shaped strip can be designed in the form of ribs or grooves formed on the inner wall of the hole, thereby enhancing the transmission of force between the embedded steel bars and the main body of the prefabricated element. If steel cables are used as the surrounding layer, ribs will be formed on the inner wall of the hole, which also enhances the friction and transmission of force. The hole that this scheme of utilization formed has the same tradition and uses the bellows to have the equal effect, has following advantage in addition:

1. the use of multiple internal formers allows for the formation of larger holes for the placement of multiple reinforcing rods within the larger holes for the attachment of prefabricated elements.

2. Instead of a round shape, other shapes, such as square or rectangular, can be formed with the present solution to conform to the structural design.

3. The inner former, polymeric release layer or cable may be reusable.

4. The scheme is more economical and has design elasticity by forming holes in the precast concrete.

The utility model discloses a connection technology utilizes the grout to fill up the hole and sets up the reinforcing bar wherein. The purpose of filling the hole conduit with grouting is to ensure that the capacity between the steel bars and the concrete can effectively transfer internal force. It is known to pump slurry into one end of a conduit in the hole, overflow the conduit at the other end, and seal the ends of the inlet and outlet. When the ends of the perforated pipe are at different levels, the slurry inlet is positioned lower so that the rising slurry displaces air from the perforated pipe until the slurry overflows the outlet.

When there are a plurality of conduit holes to be grouted, each of which is connected at one end to a gap, such as a standard column pre-form connection, the slurry is pumped from the gap at the bottom and then rises within each conduit hole to a discharge at the top of the conduit hole.

The disadvantages of this system are:

1. the overflow slurry causes waste of material. In some cases, the slurry from multiple outlets will be wasted without timely sealing.

2. The overflow slurry solidification requires manual removal and cleaning, which is very labor intensive, especially if the site is not properly managed, resulting in large scale overflow slurries.

3. After grouting is completed, the grouting line extending from the outlet is cut off.

4. It is necessary to monitor the conduit bore outlet on site and seal the outlet in time to overflow the slurry, which may not be possible in some situations.

As shown in fig. 6 and 7, a grouting monitoring element may be disposed at the outlet of the perforated pipe to reduce the waste of material due to slurry overflow and to avoid the cleaning work of the slurry overflow. As shown in FIG. 7, monitoring of the slurry is performed by connecting a plastic or metal housing 1 to a perforated pipe 2. Typically, the location of monitoring will be remote from the entrance of the grout (such as entrance 6 of fig. 6), or placed along the path of the grout or at the other end of the bore hole conduit. As shown in fig. 7, a plastic tray 3 covers the plastic housing 1 and has a plurality of holes 4. The holes 4 are sized to allow air to pass through but not the slurry. The back of the plastic tray 3 is provided with one or more channels 5 for the flow of slurry. The width of the channel 5 narrows as it approaches the plastic disc 3 and the grout monitoring element can be made of a transparent plastic to allow for clear monitoring of the grout flowing into the grout monitoring element. The grout monitoring component can be cast into the prefabricated component in the factory or installed by drilling a hole to connect with the conduit before grouting. The plastic disc should be placed flat and visible against the precast concrete surface, and the open end of the grout monitoring element is connected to the bore line to be grouted.

During grouting operation, the grout fills the hole conduit gradually and pushes air to the grouting monitoring element. Through the design, air can be discharged out of the grouting monitoring element through the narrow-gradually channel and the small hole of the disc body. When the grout fills up the hole conduit to the position of the grouting monitoring element, the grout can be guided into the channel 5 of the grouting monitoring element, the gradually narrowed channel 5 can obstruct the flowing of the grout, the lift of the grout is reduced, and finally the grout is blocked by the small hole 4 of the disc body 3 (a small amount of water of the grout can flow out). The blocked grout stays in the tray body 3, and the transparent tray body 3 can be used for observation to display whether the grout is filled.

As shown in fig. 6, which illustrates an example of the prefabricated straight column grouting. The base of the straight column is internally connected with a plurality of hole conduits and reinforcing bars. The grouting operation is intended to force grout from the base through an inlet (inlet)6, which moves up the bore hole conduit to the top thereof. The grouting monitoring element 7 is arranged at the top of the hole guide pipe, the transparent disc body of the grouting monitoring element 7 displays the grouting state of the grout, and when the transparent disc body is filled with the grout, the grouting is stopped.

The advantages of using grout monitoring elements are:

1. waste of slurry can be reduced or avoided.

2. The manpower and the wasted slurry removing are not needed to be arranged at the grouting outlet, so that the manpower is saved.

3. Without the overflow slurry, the preform element may be the final product.

4. The plastic tray body sets up with precast concrete surface plane, and the tray body is covered to the accessible whitewash.

5. The grouting monitoring element is placed at a proper position, and can be used for monitoring and verifying the complex grouting operation of multi-path grouting.

The present disclosure is not limited to the particular systems, devices, and methods described, as these may vary. The terminology used in the description is for the purpose of describing the particular versions or embodiments only and is not intended to limit the scope.

In the foregoing detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, like numerals typically identify like components, unless context dictates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here. It will be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the figures, can be arranged, substituted, combined, separated, and designed in a wide variety of different configurations, all of which are explicitly contemplated herein.

The present disclosure in accordance with certain embodiments described herein is not to be limited in scope by the specific aspects illustrated. As will be apparent to those skilled in the art, many modifications and variations are possible without departing from the spirit and scope of the disclosure. Functionally equivalent methods and apparatus, other than those enumerated herein, will be apparent to those skilled in the art from the foregoing description, within the scope of the present disclosure. Such modifications and variations are intended to fall within the scope of the appended claims. The disclosure is to be limited only by the terms of the appended claims, along with the full scope of equivalents to which such claims are entitled. It is to be understood that this disclosure is not limited to particular methods, reagents, compounds, compositions or biological systems, which can, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.

Various of the above-disclosed and other features and functions, or alternatives thereof, may be desirably combined into many other different systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations or improvements therein may be subsequently made by those skilled in the art, each of which is also intended to be encompassed by the disclosed embodiments.

Claims

1. A lap joint is applied to between concrete structures, and is characterized by comprising:

a movable rebar placed in the first tangible space, the movable rebar having a length shorter than a length of the first tangible space such that the movable rebar is fully contained within the first tangible space;

a second concrete structure positioned adjacent to said first concrete structure, said second concrete structure including a second shaped space adjacent to a second primary rebar in said second concrete structure, said second shaped space positioned substantially coaxial with said first shaped space of said first concrete structure; or a mechanical joint instead of the second shaped space, facing the first shaped space of the first concrete structure;

wherein moving the movable bar to a position in which the movable bar is partially within the first shaped space and partially within the second shaped space, thereby allowing the movable bar to partially overlap the first and second master bars; and

and grouting the first tangible space and the second tangible space with grout.

2. The lap joint of claim 1 further comprising a centering element disposed above said movable rebar for centering said movable rebar within said first shaped space.

3. The lap joint of claim 2 wherein the centering element is a metal spring coil.

4. The lap joint of claim 1 wherein a lead is used to hold the movable rebar within the first shaped space.

5. A lap joint as claimed in claim 1, wherein the grout is received by using an orifice conduit disposed between said first shaped space and one side of said first concrete structure.

6. The lap joint of claim 5 wherein a terminal end of a lead wire is passed through the bore guide to hold the movable rebar in the first shaped space by using the lead wire.

7. The lap joint of claim 1, wherein when the second shaped space of the second concrete structure is replaced by the mechanical coupler, the movable reinforcing bar and the mechanical coupler are respectively threaded to screw the reinforcing bar into the mechanical coupler by moving and rotating the reinforcing bar.

8. A lap joint as set forth in claim 5 further comprising a second perforated conduit disposed between said second shaped space and a side of said second concrete structure.

9. A grout monitoring component, uses when being applied to concrete structure grout, its characterized in that includes:

a housing connected to a bore conduit;

wherein the holes are sized to allow air to pass through but not the slurry.

10. A grout monitoring member as defined in claim 9, wherein the grout monitoring member is positioned at the grout outlet opening and at a critical path of the grout to enable observation of the progress of the grout.

11. A grout monitoring member according to claim 9, further comprising a grout complete indication to prevent grout from escaping.

12. A grout monitoring element according to claim 9, wherein the width of the plurality of grout channels narrows as they approach the grout monitoring element surface; additionally, the grout monitoring component surface is transparent.

13. A grout monitoring component according to claim 9, wherein the housing is of plastic or metal.

14. A grout monitoring component according to claim 9, wherein the disc is of plastic.

15. A concrete structure having a shaped space or bore conduit formed therein by an internal former, comprising:

an internal former formed by one or more rod members of a round or square rod in combination is used,

the inner former is wrapped around in a generally helical pattern with an anti-adhesive layer, the inner former is pulled out after the concrete is poured, and finally the anti-adhesive layer is pulled out to form one or more shaped space or hole conduits in the concrete structure.

16. A concrete structural member as claimed in claim 15, wherein the anti-adhesive surround is of plastic, teflon or silicone strip or steel cable.