JPH11264886A - Cable trench between buildings and its construction method and block structure used for the construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the construction term of a plant having a cable trench between buildings by forwarding the initiation time of cable laying work in the cable trench between buildings. SOLUTION: Supports 4a and 4b and each of beams 1a and 1b are left in a set space 24 of a cable trench between buildings even after forming the upper concrete slab 6a, and by using the supports 4a and 4b as support means for the cable tray 5, the cable tray 5 is placed in the set space 14. Without waiting for the increase of the design strength of the upper concrete slab 6a, the cable is laid in the trench between building in this construction method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a technique used for a cable trench provided between a plurality of buildings.

[0002]

2. Description of the Related Art A nuclear power plant has a plurality of buildings,
For example, as shown in FIG. 1, the reactor building 8 and the turbine building 9
And a waste building 10, a control building 11, and a service building 12.

Since the control building 11 is provided with equipment for controlling the equipment in each building, a large number of cables such as electric cables are routed between each building.

[0004] Cable trenches (grooves for laying cables) for passing these cables are constructed between the control building 11 and the reactor building 8 between the building gaps shown by hatching in FIG. You.

Conventionally, the cable trench has been constructed as follows.

That is, as shown in FIGS. 4 and 5, a cable laying route, that is, a route in which the cable tray 5 is installed,
As shown by hatching, there are three routes to the control building 11, the reactor building 8, and the center between them.

[0007] A cable trench is constructed to encompass and enclose each of these routes.

In the construction, first, each lower concrete slab 6b projecting from the reactor building 8 and the control building 11 is constructed.

During the construction, a buffer space 13 is secured between the protruding ends of each lower concrete slab 6b so as not to transmit the seismic force.

After each lower concrete slab 6b is constructed and the concrete strength of each lower concrete slab 6b becomes a value sufficient to support the load from the shoring 4, as shown in FIGS. A support 4 is erected to support the receiving beam 1, a deck plate 2 is installed above the receiving beam 1, a reinforcing bar is laid on the deck plate 2, concrete is cast on the deck plate 2, and the Each upper concrete slab 6a projecting from the furnace building 8 and the control building 11 is constructed.

In the construction, a buffer space 13 is secured between the protruding ends of each upper concrete slab 6a so as not to transmit the seismic force.

Wait until the concrete of each upper concrete slab 6a solidifies and the design strength of each upper concrete slab 6a appears.

While waiting, the receiving beam 1 and the shoring 4 are connected to the setting space 14 of the cable trench so that each upper concrete slab 6a can be supported on each lower concrete slab 6b.
To be left inside.

After the design strength of each upper concrete slab 6a is obtained, the receiving beam 1 and the shoring 4 are placed in the space between the upper and lower concrete slabs 6a and 6b, that is, the setting space of the cable trench. Remove from 14 to outside.

After that, the cable tray 5 for receiving the cable, the cable tray receiver 7, and the cable tray support 3 to which the cable tray receiver 7 is attached are installed in the setting space 14 of the cable trench. Lay the cable on it.

A sheet is placed above the upper concrete slab 6a, and the soil 15 is piled up to the ground level (GL) above the sheet.

[0017]

Since it takes about one month for the design strength of each upper concrete slab 6a to come out, during this time, the receiving beam 1 and the shoring 4 must be removed from the setting space 14 of the cable trench. Since it cannot be removed, the cable tray support 3, the cable tray receiver 7, and the cable tray 5 cannot be installed in the cable trench setting space 14, and the cable laying operation itself cannot be performed.

For this reason, in the cable trench structure as described above, the construction period of the cable trench is prolonged,
In addition, the time of cable laying work is also delayed, which causes delays in various subsequent steps.

An object of the present invention is to shorten the construction process of a plant which involves laying cables in a cable trench between buildings.

[0020]

A first means for achieving the object of the present invention is to provide a concrete slab having a plurality of upper and lower stages projecting from each building into a space between the buildings, and a protruding end of the concrete slab. In the structure of the inter-building cable trench, which is provided with an interval for buffering the transmission of seismic force between the buildings, and a cable tray provided in the upper and lower spaces of each of the concrete slabs, the structure extends from each of the buildings. A receiving beam provided immediately below each of the upper concrete slabs along the upper concrete slab and with a gap for buffering the transmission of seismic force; and at least one of the respective receiving beams is attached to the lower concrete slab. And a supporter supporting from above, wherein the cable tray is supported by the supporter. With such a structure, the shoring can support the load from the upper part, so there is no need to wait for the period to secure the strength of the upper concrete slab, and the shoring is also used as a means for supporting the cable tray. Therefore, the shoring work is regarded as permanent construction, and the operation of installing the cable tray and laying the cable on the cable tray can be performed without the trouble of removing the shoring work.

[0021] Similarly, the second means is that, in the first means, the overhang length of each upper concrete slab and the length of each receiving beam are set unequally long on one building side and long on the other building side. There is a structure of a cable trench between buildings, wherein at least a long receiving beam is supported by a shoring, and further, a cable tray is supported by the shoring. In addition to the function and effect of the first means, The concrete slab with a long overhang is made by supporting the beam with a support, the concrete slab with a short overhang is short, and the short concrete slab is cantilevered. It can be made without support and adopted in the state of
Furthermore, since there is no support even though the lower part of the short concrete slab is narrow, an operation of simplifying the construction work and the cable laying work on the short concrete slab side can be obtained.

[0022] Similarly, the third means is to construct a lower concrete slab projecting from each building between the buildings, and to support a receiving beam with a supporter standing on the lower concrete slab. To support the deck plate, cast concrete using the deck plate as a concrete formwork to construct an upper concrete slab projecting from each of the buildings, and furthermore, to transmit seismic force between the opposite ends of each of the concrete slabs. Constructing a setting space for a cable trench between buildings vertically sandwiched by the concrete slabs in the space between the buildings by setting a buffering interval, and installing a cable tray in the setting space for the cable trench between the buildings. In the method for constructing a structure of a cable trench between buildings to be constructed in a building, an upper concrete on one building side of each of the buildings is provided. Setting a gap for buffering the transmission of seismic force between the lower beam of the upper slab and the lower beam of the upper concrete slab on the other building side, and further supporting the cable tray on the support, A method of constructing a structure of an inter-building cable trench, wherein a support and each beam are left in a set space of the inter-building cable trench even after the construction of the upper concrete slab. Since the upper concrete slab is supported by beams and supports until the design strength of the cable is obtained, the work of laying cables can be performed in the setting space of the cable trench between buildings before the design strength is obtained, and Since it is not necessary to remove it by installing it as a support means, it is not necessary to wait for the design strength of the upper concrete slab, and it is also supported. The effect of enabling laying work cables can be obtained in the configuration space of the building between the cable trenches without removal.

[0023] Similarly, in the fourth means, in the third means, after the lower concrete slab is constructed, the relative positional relationship between the deck plate, the receiving beam, the shoring, and the cable tray is determined in the setting space of the inter-building cable trench. A method of constructing a structure of an inter-building cable trench, characterized by carrying a block structure combined in the same manner as the installation state on the lower concrete slab, and thereafter constructing an upper concrete slab. In addition to the functions of the three means, the members required for forming the cable trench can be collectively transported to the construction position while being blocked in a state where the positional relationship is in the construction positional relationship, and the operation period is further shortened. can get.

A fifth means is the third means, wherein the concrete slab of each building is shortened to construct a short concrete slab, and the concrete slab of the other building is shortened. A long concrete slab was constructed by extending the overhang length of the concrete slab, and the method of the fourth means was used as a method of constructing the inter-building cable trench on the space side vertically sandwiched by the long concrete slab. A method of constructing a structure of a cable trench between buildings, characterized by the fact that, in addition to the function and effect of the third means, the construction of a long upper concrete slab side is efficiently performed using a block structure shown in a fourth means. In the case of construction on the other short upper concrete slab side, the receiving beam is short, so the beam is supported cantilevered from the building wall. The now be employed in the construction, effect that installation and laying work cables cable tray in the absence of shoring below the short upper concrete slab can be performed efficiently is obtained.

Similarly, the sixth means comprises a concrete formwork,
A receiving beam to which the concrete formwork is mounted to support the concrete formwork, a shoring mounted to the receiving beam to support the receiving beam from below, and mounted to be supported by the shoring It is a block structure used for a method of constructing an inter-building cable trench in which a cable tray and an inter-building cable trench are integrated. Since this block structure integrates a structure necessary for the construction of an inter-building cable trench, the block structure is By bringing the structure to the construction position of the inter-building cable trench, a plurality of components necessary for construction are provided at once at the construction position, and an effect of shortening the construction period is obtained.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A nuclear power plant according to an embodiment of the present invention comprises a reactor building 8 and a turbine building 9 as shown in FIG.
And a waste building 10, a control building 11, and a service building 12.

Since the control building 11 is equipped with equipment for controlling the equipment in each building, a large number of cables such as electric cables are routed between each building.

Cable trenches for passing these cables are formed in the control building 11 and the reactor building 8.
And between the building intervals shown by hatching in FIG.

The setting space 14 of the cable trench is
As shown in FIGS. 2 and 3, the space is a space surrounded by the wall of the reactor building 8, the wall of the control building 11, each upper concrete slab 6a, and each lower concrete slab 6b.

Setting space 1 for such a cable trench
4 exists below the ground level (GL) and is constructed as follows.

First, the reactor building 8 and the control building 1
1 and each lower concrete slab 6b is extended and constructed. Between the protruding ends of each lower concrete slab 6b, seismic force is hardly transmitted between the buildings.
A buffer gap 13 is provided.

Of the lower concrete slabs 6b, the lower concrete slab 6b on the reactor building 8 side is constructed to be shorter than the lower concrete slab 6b on the control building 11 side.

As shown by the diagonal lines in FIG. 2, there are three routes for laying the same cables as the route for installing the cable tray 5, namely, the route near the control building 11, the route near the reactor building 8, and the center between them. I do.

The lower concrete slab 6 on the control building 11 side has a length covering the lower part of the two routes.
The overhang length of b is set.

After the strength of each lower concrete slab 6b has reached the design strength, the block structure previously manufactured before the design strength is released is suspended by a crane above the lower concrete slab 6b on the control building 11 side. .

The block structure is composed of a long H-shaped steel beam 1a having a length substantially equal to the overhang length of the lower concrete slab 6b on the control building 11 side, and the vicinity of both ends of the beam 1a. H-shaped steel supports 4a, 4b fixed to support the receiving beam 1a;
a, a deck plate 2a fixed to an upper portion of the cable tray 5, a cable tray receiver 7 made of angle steel fixed to the supports 4a, 4b, and a cable tray 5 mounted on the cable tray receiver 7. The relative positions in the block are determined based on the same positional relationship as that of the constituent components that are configured and arranged in the construction position.

When such a block structure is carried into the lower concrete slab 6b on the control building 11 side by a crane, the support 4a is constructed using anchor bolts or the like previously installed on the lower concrete slab 6b during construction. , 4b are fixedly installed on the lower concrete slab 6b.

Above the lower concrete slab 6b on the other reactor building 8 side, a short beam 1 made of H-section steel is used.
b is fixed at one end to the wall of the reactor building 8 at the height of the lower end position for constructing the upper concrete slab 6a, and the other end protrudes from the wall.

As described above, the short receiving beam 1b is cantilevered from the wall of the reactor building 8, and the deck plate 2b is mounted thereon to fix them.

On the deck plates 2a, 2b supported by the respective receiving beams 1a, 1b, reinforcing bars are arranged, concrete is entangled with the reinforcing bars on the deck plates 2a, 2b, and each upper concrete slab 6a is mounted. to build.

In order to prevent the seismic force from being transmitted between the buildings, a buffer gap 13 is formed between the upper concrete slabs 6a.

With respect to such a gap 13, each of the receiving beams 1
a and 1b are similarly provided between competitors.

When constructing each of the upper concrete slabs 6a, the load at the time of placing concrete is limited to the reactor building 8
A short receiving beam 1b is supported on the short upper concrete slab 6a side having a short overhang length on the side, and is supported via the receiving beam 1a on a long overhanging long concrete slab 6a side on the control building 11 side. Work 4a, 4b supports.

Thereafter, without waiting for the design strength of the upper concrete slab 6a to come out, the cable tray support 3 is fixed to hardware previously embedded in the wall of the reactor building 8, and the cable tray support 3 is mounted on the cable tray support 3. The cable tray receiver 7 made of die steel is fixed, and the cable tray 5 is mounted on the cable tray receiver 7 and mounted.

The assembling work in the cable trench setting space 14 is an obstacle to the work because there are no supports 4a and 4b below the upper concrete slab 6a on the reactor building 8 side. And the work can be done smoothly.

Thereafter, the setting space 1 of the cable trench is set.
In 4, the work of laying cables on the cable tray 5 is performed.

Setting space 1 for such a cable trench
The various operations in 4 are started before the upper concrete slab 6a reaches the design strength, and the various operations are performed earlier in the process.

Thus, not only the construction process of the cable trench but also the construction process of the nuclear power plant including the cable trench are shortened.

After the concrete has solidified and the upper concrete slab 6a has reached the design strength, a sheet such as a waterproof sheet is placed on the upper surface of each upper concrete slab, and the cushioning gap 13 is passed over the gap 13. It is covered with a waterproof board made of butyl rubber and Styrofoam. The soil 15 is piled up on the sheet until it reaches the ground level (GL).

[0050]

According to the first aspect of the present invention, the shoring is used as a supporting means of the cable tray, and the number of temporary members can be reduced, and the design strength of the upper concrete slab can be maintained. Since the structure allows cable laying work, it can contribute to shortening the construction period of a plant having a cable trench between buildings.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the construction period that does not use any shoring can be partially adopted to further shorten the construction period of the plant.

According to the third aspect of the present invention, the shoring is permanently installed as a means for supporting the cable tray, the use of temporary materials is reduced, and the cable is not waited for until the design strength of the upper concrete slab is secured. Since the construction method allows laying work, it can contribute to shortening the construction period of a plant having a cable trench between buildings.

According to the invention of claim 4, in addition to the effect of the invention of claim 3, a plurality of parts constituting the structure in the cable trench can be carried at once to the construction position, so that the construction period of the plant is further shortened. Can contribute to

According to the fifth aspect of the present invention, in addition to the effect of the third aspect of the present invention, the shortening of the construction process by employing the block structure and the shortening by the construction process using no support work are used in combination. This can further contribute to shortening the construction period of the plant.

According to the sixth aspect of the present invention, a plurality of parts necessary for the construction of the inter-building cable trench can be carried at once and aligned at the construction position. The effect of shortening the construction period of the cable trench can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a building of a nuclear power plant, in which parts to which the present invention is applied are indicated by hatching.

FIG. 2 is a plan view of a support for a cable trench between buildings and a cable tray according to the present invention.

FIG. 3 is a longitudinal sectional view of the cable trench between buildings according to the present invention viewed from the arrow II in FIG. 2;

FIG. 4 is a plan view of a conventional example of supporting a cable trench between buildings and a cable tray.

FIG. 5 is a longitudinal sectional view of the cable trench between buildings of the conventional example viewed from the direction of arrows II-II in FIG. 4;

[Explanation of symbols]

1a, 1b ... receiving beam, 2a, 2b ... deck plate, 3 ...
Cable tray support, 4a, 4b: Shoring, 5: Cable tray, 6a: Upper concrete slab, 6b ...
Lower concrete slab, 7 Cable tray receiver, 8
... Reactor building, 11 ... Control building, 13 ... Gap.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Katsunori Koike 3-5 Kojimachi, Chiyoda-ku, Tokyo Hitachi Construction Design Co., Ltd.

Claims (6)

[Claims] An upper and lower multi-stage concrete slab projecting from each building to a space between the buildings, an interval provided between protruding ends of the concrete slab to buffer transmission of seismic force between the buildings, In a cable trench between buildings provided with cable trays installed in the upper and lower spaces of the concrete slab, the seismic force is generated along the upper concrete slab directly under each of the upper concrete slabs extending from each of the buildings. Each of the receiving beams is provided with a gap for buffering the transmission, and a shoring supporting at least one of the receiving beams from above the lower concrete slab is provided. The supporting tray supports the cable tray. Cable trench between buildings characterized by the following. 2. The structure according to claim 1, wherein the overhang length of each of the upper concrete slabs and the length of each of the receiving beams are unequally set to be short on one building side and long on the other building side. The inter-building cable trench, wherein the long receiving beam is supported by a shoring, and further the cable tray is supported by the shoring. 3. A lower concrete slab projecting from each building is constructed between the buildings, and a supporting beam is supported by a supporter erected on the lower concrete slab, and a deck plate is supported by the receiving beam. Supporting, constructing an upper concrete slab that overhangs from each building by casting concrete with the deck plate as a concrete formwork,
Further, a space for buffering the transmission of seismic force is set between the opposite ends of each of the concrete slabs, and a set space for a cable trench between buildings sandwiched vertically by each of the concrete slabs is constructed in the space between the buildings. A method of constructing a cable trench between buildings, wherein the cable tray is constructed by setting a cable tray in a setting space of the cable trench between buildings, wherein: a receiving beam below an upper concrete slab on one building side of each of the buildings and the other building side; A gap for buffering the transmission of seismic force is set between the upper concrete slab and the lower beam of the upper concrete slab, and further, a cable tray is supported by the shoring, and the shoring and each of the receiving beams are connected to the upper concrete slab. A cable trench between buildings characterized by being left in a set space of the cable trench between buildings even after the slab is constructed. Installation method. 4. The construction of claim 3, wherein after the lower concrete slab is constructed, the relative positional relationship between the deck plate, the receiving beam, the shoring, and the cable tray is the same as the installation state of the inter-building cable trench in the set space. A method of constructing a cable trench between buildings, wherein a block structure combined as described above is carried into the lower concrete slab, and thereafter, an upper concrete slab is constructed. 5. The concrete slab according to claim 3, wherein the length of the concrete slab of one of the concrete slabs in each of the buildings is shortened to construct a short concrete slab.
A long concrete slab is constructed by extending the overhang length of the concrete slab of the other building, and as a construction method of a structure of a cable trench between buildings on the space side vertically sandwiched by the long concrete slab. A method for constructing a cable trench between buildings using the method according to claim 4. 6. A concrete formwork, a receiving beam on which the concrete formwork is mounted to support the concrete formwork, a shoring mounted on the receiving beam and supporting the receiving form from below, A block structure used in a method of constructing an inter-building cable trench, in which a cable tray mounted so as to be supported by a worker is integrated.