JPH10219709A - Construction method of precast concrete foundation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a precast concrete foundation in a cold district by use of precast foundation blocks which does not require an antifreezing agent or a high-early-strength agent differently from usual cases and securely hardens concrete in an appropriate temperature. SOLUTION: PC foundation blocks 11-16 are arranged and erected on crushed stones and reinforcements are arranged at the connection parts 11a-16a of the PC foundation blocks 11-16 and the lower periphery of the blocks 11-16. And hot water circulation pipes 31, 31a, 32, 32a are arranged to surround the connection parts 11a-16a of the PC foundation blocks and the lower periphery thereof. And a framework is formed by form members to surround the arranged reinforcements and the circulation pipes so as to extend over both sides of the connection parts 11a-16a of the PC foundation blocks and the lower side of the PC foundation blocks 11-16. Then, ready-mixed concrete is placed in the framework and cured while conducting hot water to the circulation pipes 31, 31a, 32, 32a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a PC foundation using a PC foundation block of a building such as a house.

[0002]

2. Description of the Related Art Conventionally, foundations for constructing buildings such as houses are constructed by adding a deicing agent or an early-strength agent to concrete to prevent freezing of cast concrete in winter construction in cold regions. A method of assembling a tent around a foundation and curing while heating with briquettes or the like has been adopted. In addition, even when a PC base block as described in Japanese Utility Model Laid-Open No. 1-61241 is used, concrete is cast on a connection portion or the like on site, so that curing is necessary.

[0003]

However, in the above-mentioned method for curing concrete in a cold region, the effect cannot be expected sufficiently by mixing a deicing agent or an early-strength agent. Even when curing while heating with briquettes or the like, there is a problem that the effect is not sufficiently exhibited depending on the cold.

[0004] In particular, when a PC base block as described in Japanese Utility Model Laid-Open Publication No. 1-61241 is used, the joint of the connecting portion and the concrete cast below the PC base block are formed. The capacity is smaller than that of the conventional cloth foundation method, and the heat of reaction cannot be expected much.

[0005] The present invention has been made in view of the above-mentioned problems.
In order to solve these problems, it is not necessary to mix anti-freezing agents and early-strength agents in the construction of foundations in cold regions using PC-made foundation blocks. It is intended to provide a method for assembling a PC-made foundation that can be reliably performed at an appropriate temperature.

[0006]

According to a first aspect of the present invention, there is provided a method of constructing a PC foundation, comprising connecting a PC foundation block to a rising portion, and casting a ready-mixed concrete around a lower portion thereof to form a base portion. A method for constructing a PC foundation for forming and constructing a foundation of a building in an inverted T-shape, wherein the PC foundation block is placed and erected on a crushed stone laid, and a connection portion between the PC foundation blocks is provided. And while arranging the reinforcement around the lower part of the PC-made base block, connecting the connection part of the PC-made base block and the circulation pipe of hot water surrounding the lower part,
Between the connecting portions of the PC-made base block, and straddling both lower sides of the PC-made base block, a frame including the reinforcing bars arranged and the circulated pipes is formed by a frame material. , Pour the ready-mixed concrete into the framework,
Curing and hardening of ready-mixed concrete is performed while flowing hot water through the circulation pipe.

According to a second aspect of the present invention, there is provided a method of constructing a PC-made foundation.
The construction method for a PC-made foundation according to claim 1, wherein
The hot water circulation pipe in a portion surrounding the connection portion of the base block is formed in a loop shape in advance.

According to a third aspect of the present invention, there is provided a method for constructing a PC foundation.
The construction method for a PC-made foundation according to claim 1, wherein
A plurality of circulation pipes of hot water surrounding the lower part of the base block are arranged in parallel, and the flow directions of the hot water in the adjacent circulation pipes are opposite to each other.

According to a fourth aspect of the present invention, there is provided a method for constructing a PC-made foundation.
The construction method for a PC-made foundation according to claim 1, wherein
A plurality of hot water circulation pipes surrounding the lower periphery of the base block are arranged in parallel, and the hot water circulation system of the adjacent circulation pipes is a different system.

[0010]

According to the first aspect of the present invention, a PC base block is placed on a crushed stone laid and erected, and a connection portion between the PC base blocks and a lower peripheral portion of the PC base block are provided. In addition to using reinforcing steel for reinforcement, a circulation pipe for circulating hot water for warming the ready-mixed concrete is connected to the connection part of the PC base block and the lower periphery, and then, By using a frame material, a frame including the reinforcing bars and the circulating pipes is arranged between the connecting portions of the PC base block and on both sides of the lower portion of the PC base block. Then, the ready-mixed concrete is poured into the framework, and the ready-mixed concrete is cured and hardened while flowing hot water through the circulation pipe, so that the ready-mixed concrete does not lack heat capacity even at a low temperature in a cold region. It is possible to reliably curing the REIT at a suitable temperature.

According to the second aspect of the invention, the operation of the first aspect of the invention is achieved, and the portion of the circulation pipe surrounding the connection portion of the PC base block is formed in a loop shape in advance. The connection portion of the PC base block is reliably surrounded and piped, so that the ready-mixed concrete at the connection portion can be surely cured at a more appropriate temperature.

According to the third aspect of the present invention, the operation of the first aspect of the present invention is achieved, and even if the hot water flowing through the circulation pipe is gradually reduced, the circulation of the hot water surrounding the lower periphery of the PC base block is achieved. Since a plurality of pipes are arranged side by side and the flow direction of the hot water in this circulation pipe is opposite to that of the adjacent circulation pipe, even if the temperature of the hot water in one of the circulation pipes is low, the hot water in the other Combined with the heating action by, the circumference of the circulation pipe will be heated to almost the same temperature as a whole regardless of its position,
It becomes possible to cure the ready-mixed concrete uniformly.

According to a fourth aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, a plurality of circulation pipes are arranged in parallel to surround the lower periphery of the PC base block. Since the hot water circulation system of adjacent circulation pipes is a different system, even if one hot water circulation system stops the flow of hot water due to failure etc., hot water flows through the circulation pipes of the other system. ,
Although the heating efficiency is somewhat reduced, it is possible to heat and cure the ready-mixed concrete.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIGS. 1 and 2 show one embodiment of a method of constructing a PC foundation according to the present invention, and FIG.
FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 shows P
It is sectional drawing which shows an example of the structure of the base part under the C base block. In this embodiment, as shown in FIG. 1, a foundation of a substantially square building in plan view is constructed in a building site. First, an outer frame line 1 and an inner frame line 1a are constructed.
A crushed stone (see FIG. 2 and FIG. 3) is laid in the inside surrounded by and the base blocks 11 to 11 made of PC are laid on the crushed stone.
16 are arranged and erected.

The PC base blocks 1 adjacent to each other in the cross direction are provided inside both ends of the PC base blocks 11 and 14.
Connection portions 11a and 14a which are missing for pouring concrete for joining with 2, 16, 13 and 15 are provided respectively.

On the mating sides of the PC base blocks 12 and 13 and 15 and 16, there is provided a connecting portion 12 which has been dropped to pour concrete for joining into the inside thereof.
a, 13a and 15a, 16a are provided respectively.

Subsequently, the lower periphery of the PC base blocks 11 to 16 and the connecting portions 11a, 12a, 13a, 14a, 15a, 16a of the PC base blocks 11 to 16 are described.
Are arranged using a reinforcing bar (see FIGS. 2 and 3).

Subsequent to the reinforcement, the pipes are divided into two series by circulation pipes 31 and 32 for circulating hot water for heating the ready-mixed concrete so as to surround the lower periphery of the PC base blocks 11 to 16. And outgoing pipes 31, 32,
The return pipes 31 a and 32 a are connected to the hot water boiler 4.

An example of the reinforcing bar arrangement and an example of the circulation pipe will be described with reference to the drawings. As shown in FIG.
Butted connection part 1 of C base blocks 15 and 16
Reinforcing bars 5 are provided in the cross sections 5a and 16a vertically and horizontally, and a circulation pipe 31 (or 31a) for circulating hot water is provided between the connecting portions 15a and 16a where the reinforcing bars 5 are provided. , 16 are arranged so as to extend in a substantially circular shape upward from the lower side, and are fixed to the rebar 5 using wires 9.

On the other hand, crushed stones 6 are laid below the PC base blocks 15 and 16, and the PC base blocks 1 laid and erected on the crushed crushed stones 6.
The heights 5 and 16 are adjusted by adjusting bolts 8 of the base 7 provided on the legs 15b and 16b.

The space 15 below the PC base blocks 15 and 16, ie, the space 15 between the legs 15b and 16b.
In the same manner, the reinforcing bars 5 are arranged at c and 16c, and preparations are made for a foundation made of concrete.

Subsequently, as shown in FIG. 3, a frame is formed using the formwork material 21 so as to include the reinforcing bar 5 and the circulating pipes 31, 31a or 32, 32a from outside. I do.

As described above, the reinforcing bar 5 of each connection portion
And the circulation pipes 31, 31a or 32,
After completing the piping by the pipe 32a, as shown in an example shown in FIG. 3 (in this example, the circulation pipes 31 and 31a are reciprocated in two lines below the PC-made basic block), the form member 21 is formed.
Then, the ready-mixed concrete 22 is poured into the inside of the base, and the connection portion and the placement of the base portion below the PC base block are completed.

Next, the hot water boiler-4 is operated to supply and circulate hot water to the circulation pipes 31, 31a and 32, 32a, and to cure and harden the poured concrete while heating it at an appropriate temperature. . Therefore, unlike the conventional foundation work, the foundation can be free from incomplete hardening due to freezing and damage such as cracks.

As is apparent from FIG. 1, the circulation pipe for the warm water surrounding the lower part of the PC base blocks 11 to 16 is a circulation pipe 31 on the outward path outside the PC base blocks 11, 12, and 16. The inside is the return pipe 31a, and the PC base blocks 13, 14,
The inside of 15 is the outward circulation pipe 32 and the outside is the return circulation pipe 32a.
16, two circulation pipes are arranged side by side, and the flow of hot water is opposite to that of the adjacent circulation pipe, so even if the temperature decreases as the hot water flows through the circulation pipe, Combined with the heating action of the other circulating pipe by the hot water, the circumference of the circulating pipe will be heated to almost the same temperature as a whole regardless of its position, and it is possible to cure the ready-mixed concrete uniformly .

(Embodiment 2) FIG. 4 to FIG.
It shows another embodiment of the method of constructing a C-made foundation,
FIG. 4 is a plan view, FIG. 5 shows the structure of the connection part of the PC base block of FIG. 4, (a) is a perspective view of the connection part of the PC base block of part A in FIG. (B) is a perspective view of a connection portion of the PC base block of the portion B in FIG. 4, and FIG. 6 is a perspective view showing a state when the ready-mixed concrete is cured.

In this embodiment, as shown in FIG. 4, the area of the building is wider than that of the first embodiment shown in FIG.
This is for constructing the foundation of a rectangular building having a middle foundation. First, crushed stone (not shown) is laid inside the outer frame 10 and the inner frame lines 10a and 10b. On top, PC base blocks 110, 120, 13
0, 140, 150, 160, 170, 180 are arranged and erected. In addition, crushed stones (not shown) are also laid inside the interior surrounded by the inner frame lines 10a and 10b, and PC base blocks 190 and 200 are arranged and erected on the crushed stones. The PC foundation blocks 190 and 200 constitute a middle foundation.

The PC base blocks 110, 140,
Inside the both ends of each of 150 and 180, PC base blocks 120 and 190 adjacent in the cross direction, respectively,
130 and 200, 200 and 160, and 190 and 170
Connection portions 110a, 140a, 150a, and 180a, which are missing for pouring concrete for joining with, are provided respectively.

Also, PC basic blocks 120 and 13
0, and on the abutting side of 160 and 170, missing connection portions 120a, 130a, and 160a, 170a
Are respectively provided, and concrete for joining is poured into the portions to be joined. Note that the PC base blocks 190 and 200 constituting the middle base are arranged upright at intervals without providing a missing connection portion, and concrete for joining is poured into the gap portion. It is to be joined.

Subsequently, PC basic blocks 110 to 20
0 and the PC base blocks 110 to 18
0 connection parts 110a, 140a, 150a, 180a,
The connecting portions of the 120a, 130a, 160a, 170a and the PC base blocks 190 and 200 constituting the middle base are arranged using a reinforcing bar (see FIGS. 5A and 5B).

Regarding the example of the arrangement of the reinforcing bars, the method of arranging the reinforcement around the lower part of the PC base blocks 110 to 200 is the method of arranging the PC base blocks 110 to 200 and the method of adjusting the height and the horizontality. Similarly to the case of the first embodiment, the detailed description is omitted because it is substantially the same as that of the first embodiment.

Also, PC basic blocks 110 to 180
Connection parts 110a, 140a, 150a, 180a, 1
The method of arranging the reinforcing bars in 20a, 130a, 160a, and 170a is also substantially the same as that in the first embodiment, and thus the detailed description is omitted.

Following this arrangement, a circulation pipe for circulating hot water for heating the ready-mixed concrete is provided.
As shown in FIG. 4, the circulation pipes 310, 320, 330
And divided into three series by PC
A pipe is formed so as to surround the lower periphery of 00 and along the connecting portion of each PC base block. In FIG.
3 are indicated by 310a, 320a, and 330a, respectively.
10, 320, 330 and return pipes 310a, 320
a, 330a to the hot water boiler 40.

That is, the first series of circulation pipes 310
Comes out of the hot water boiler 40, PC base block 1
The lower side of the PC base block 190, 200 for the middle base, the PC base block 1
It is disposed so as to return to the middle of the lower side of the PC base block 140 through the lower side of 10, 120, 130, and is connected to the hot water boiler 40. The circulation pipe 310 is disposed so as to approach the bundle base portions 500, 500 in the middle of the lower side of each of the PC base blocks 190, 200 for the middle base.

Further, the circulation pipe 320 of the second series is
After exiting the hot water boiler 40, the PC base block 140
Into the lower part of the inside of the PC,
20, 110, 180, 170, 160, 150, the lower part of the inside of the PC base block 140 is disposed to return to the middle part below, and is connected to the hot water boiler 40.

Further, a third series of circulation pipes 330
Comes out of the hot water boiler 40, PC base block 1
It is connected to the hot water boiler 40 via the lower part outside of 50, 160, 170, 180 and the lower part of the side of the PC base blocks 190, 200 for the middle foundation. The circulation pipe 330
Are disposed so as to approach the overhanging base portions 600 for entrance.

These circulation pipes 310, 320, 33
A loop portion is provided in advance in a portion corresponding to a connection portion between PC basic blocks 0, and the loop portion is set up so as to face the connection portion.

The connecting portions 110a, 140a, 150a, 180a, 12 of the PC basic blocks 110 to 180
The arrangement method of the circulation pipes at 0a, 130a, 160a, and 170a will be described with reference to FIG. 5A. The arrangement method of the circulation pipes at the connection portions 120a and 130a between the PC base blocks 120 and 130 will be described. That is, the PC base blocks 120 and 130 of the second circulation pipe 320
A loop portion 320a provided in advance at a portion corresponding to the connection portions 120a and 130a of the
And fix it to the arranged reinforcing bar 50 using a wire 90.

As described above, the connecting portions between the PC-made base blocks 190 and 200 constituting the middle base are arranged and erected at an interval, as shown in FIG. A loop 310a previously provided in the circulation pipe 310 is located in the gap, and the loop 310a
And fix it to the arranged reinforcing bar 50a using a wire 90a.

As described above, the loop sections 310a and 320a are provided in advance in the circulation pipes 310 and 320, and the loop sections 310a and 320a are started up to connect the connection sections 120a and 130a of the PC base blocks 120 and 130 and the PC base section constituting the middle base. A method in which a circulation pipe is slackened at a connection part and bypassed so as to draw a substantially circular shape, as in the first embodiment, by making the connection part face the connection part between the basic blocks 190 and 200. In this case, the length of the slack portion may be excessive or insufficient, and it may be difficult to heat the connection portion at an appropriate temperature. However, since the loop portion has a fixed length, the connection portion of these PC base blocks is heated at an appropriate temperature. Curing of ready-mixed concrete is ensured.

Subsequently, although not shown, the above-arranged reinforcing bars 50, 50a and the circulating pipe 310,
As in the first embodiment, the framing is performed using the frame material so as to cover the outer surfaces 320 and 330 from each other.

As described above, the reinforcing bar 5 of each connection portion
0, 50a and the circulation pipe 310 (310
a) After completing the piping by 320 (320a) and 330 (330a), the ready-mixed concrete is poured into the inside of the form material to complete the installation of the connection portion and the base portion below the PC-made base block. . Thereafter, as shown in FIG. 6, the concrete is covered with sheets 400 so that the hardened concrete can be more reliably cured without being affected by the outside air.

Next, the hot water boiler 40 is operated, and the circulation pipes 310 (310a), 320 (320a), 33
Hot water is supplied and circulated at 0 (330a), and curing and hardening are performed in a state where the poured concrete is heated to an appropriate temperature.
Therefore, unlike the conventional foundation work, the foundation can be free from incomplete hardening due to freezing and damage such as cracks.

In the second embodiment, the same operation and effect as those of the first embodiment can be obtained. For example, in the circulation pipe surrounding the lower part of the PC base blocks 120 and 130, the outward path is the second series of circulation. Like the pipe 320, the return path is the first series of circulation pipes 310a, and two circulation pipes of hot water surrounding the lower periphery of the PC base block are arranged side by side. Since the hot water circulation system is a different system, even if one hot water circulation system stops the flow of hot water due to failure etc., the heating water flows through the circulation pipe of the other system, so the heating efficiency is somewhat reduced, but The ready-mixed concrete is heated by the warm water flowing through the circulation pipe, and hardly causes damage such as incomplete hardening due to freezing and cracks.

[0045]

According to the first aspect of the present invention, a PC base block is placed and erected on a crushed stone laid, and a connecting portion between the PC base blocks and A reinforcing pipe is laid around the lower part of the PC base block using a reinforcing bar, and a circulation pipe for circulating hot water is connected to the PC.
Piping so as to surround the connection part of the base block made of PC and the lower periphery, and then straddling between the connection parts of the base block made of PC and both sides of the lower part of the base block made of PC,
A framework including the above-arranged reinforcing bars and the circulated circulation pipe is formed by using a form material, and then, the ready-mixed concrete is poured into the framework, and the fresh concrete is cured while flowing hot water through the circulation pipe.・ Since hardening is performed, even under low temperatures in cold regions, it is possible to reliably cure ready-mixed concrete at an appropriate temperature without a shortage of heat capacity. It can be a foundation without damage such as hardening and cracking.
Therefore, it is suitably used as a method for constructing a PC-made foundation.

In the method for constructing a PC foundation according to the second aspect, the effect of the above-described method for constructing a PC foundation according to the first aspect is exhibited, and a portion surrounding the connecting portion of the PC foundation block of the circulation pipe is provided. Is formed in a loop shape in advance, so that it is reliably piped so as to surround the connection portion of the PC base block, and it is possible to surely cure the ready-mixed concrete at this connection portion at an appropriate temperature.

According to the third aspect of the present invention, the operation of the first aspect of the present invention is achieved, and even if the hot water flowing through the circulating pipe gradually decreases, the circulation of the hot water surrounding the lower periphery of the PC base block is achieved. Since a plurality of pipes are arranged side by side and the flow direction of the hot water in this circulation pipe is opposite to that of the adjacent circulation pipe, even if the temperature of the hot water in one of the circulation pipes is low, the hot water in the other Combined with the heating action by, the circumference of the circulation pipe will be heated to almost the same temperature as a whole regardless of its position,
It becomes possible to cure the ready-mixed concrete uniformly.

According to a fourth aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, a plurality of circulation pipes are arranged in parallel so as to surround the lower periphery of the PC base block. Since the hot water circulation system of adjacent circulation pipes is a different system, even if one hot water circulation system stops the flow of hot water due to failure etc., hot water flows through the circulation pipes of the other system. ,
Although the heating efficiency is somewhat reduced, it is possible to heat and cure the ready-mixed concrete.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a method for installing a PC foundation according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a cross-sectional view showing an example of a structure of a base portion below a PC base block.

FIG. 4 is a plan view showing another example of the method for installing a PC foundation according to the present invention.

5A and 5B show a structure of a connection portion of the PC base block shown in FIG. 4; FIG. 5A is a perspective view of a connection portion of the PC base block in a portion A of FIG. 4; B part of PC
It is a perspective view of the connection part of a manufacturing base block.

FIG. 6 is a perspective view showing a state in which ready-mixed concrete is cured.

[Explanation of symbols]

1, 10 -------- Outer frame line 1a, 10a ---- Inner frame line 11-16, 110, 120, 130, 140, 15
0, 160, 170, 180 ---------------- PC base block 190, 200 --- PC base block for middle base 11a, 12a, 13a, 14a, 15a , 16a, 1
10a, 120a, 130a, 140a, 150a, 1
60a, 170a, 180a ------ Connecting part 21 -------- Forming material 22 ---------- Premixed concrete (base part) 31, 32, 310, 320, 330 --- circulation pipe (outbound route) 31a, 32a, 310a, 320a, 330a ---
Circulation pipe (return route) 4,40 ----------- Hot water boiler 5,50,50a ----------- Reinforcing steel 6 ---- -Crushed stone 15b, 16b ---------- Leg 15c, 16c ---------- Space 7 ---------- Base 8 ----- ----- Adjusting bolt 9,90,90a --- Wire 400 -------- Sheet

Claims (4)

[Claims] 1. A base block made of precast concrete (hereinafter abbreviated as PC) is connected and used for a rising portion.
A method of constructing a PC foundation in which a base portion is formed by pouring ready-mixed concrete around a lower part thereof and constructing the foundation of the building in an inverted T shape, wherein the PC foundation block is placed on the crushed stone laid. It is erected, and reinforcement is provided around the connection between the PC-made base blocks and the lower periphery of the PC-made base block, and the hot water circulation pipe surrounding the connection part of the PC-made base block and the lower periphery is laid. Followed by the PC
Between the connecting portions of the base blocks made of PC and on both sides below the base blocks made of PC, a framework including the above-arranged reinforcing bars and the circulated pipes is formed using a form material. A method for constructing a PC-made foundation, characterized in that concrete is poured into the framework and hot concrete is cured and hardened while flowing hot water through the circulation pipe. 2. The method according to claim 1, wherein a circulation pipe of the hot water in a portion surrounding the connection portion of the PC base block is formed in a loop shape in advance. 3. A plurality of circulation pipes of hot water surrounding the lower periphery of the PC base block are arranged side by side, and the flow directions of the hot water in the adjacent circulation pipes are opposite to each other. The method for constructing a PC foundation according to claim 1. 4. A hot water circulation system for a plurality of hot water circulation pipes surrounding the lower part of the PC base block, wherein the circulation pipes are adjacent to each other. 3. The method for constructing a PC foundation according to 1 or 2.