JPS58123925A - Method of constructing new structure in ground below existing structure and filling body used in said method - Google Patents

Abstract

PURPOSE:To prevent sinking of an existing structure, by a method wherein a new structure is built below an existing structure, temporarily supported, and a filling substance is implanted into filling bodies between the two structures to expand and cure it, and the own weight of the existing structure is transferred to the new structure. CONSTITUTION:A foundation 3 of an existing structure 1 is coupled to a temporary support beam 4, and through operation of a jack placed between the temporary support beam 4 and support piles 2, 2b so that the temporary support beam 4 is jacked up, the own weight W of the structure 1 is transferred to the support piles 2a and 2b to sink and stabilize the support piles 2a, 2b. A temporary support material 6 is then inserted between the tempoary support beam 4 and the support piles 2a, 2b, the jack is removed, and a new structure 8 is constructed right below the existing structure 1. Cement paste 18 is placed in a cloth bag 10 of a filling body 9 located between the foundation 3 and the new building structure 8, mortar 19 is deposited in a cloth bag 11 to expand and cure the filling body 9, and this causes occurring of sinking by delta3 of the structure 8 by serving the own weight W of the structure 1 as a reaction force.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for constructing a new structure underground below an existing structure, and a filling material used therein.

Conventionally, in this type of construction method, after constructing a new structure with the existing structure temporarily supported, concrete is poured between the two existing structures, and the work of joining the main support is carried out after waiting for the concrete to harden. It had ended.

For this reason, after joining, the weight of the existing structure acts on the new structure, causing the existing structure to sink together with the new structure, and the tendency for uneven settlement to occur, resulting in deformation of the structure of the existing structure. There was an opportunity for this to occur.

In order to avoid such sinking of the existing structure, before concrete is poured, a new type of jack is inserted between the two structures to prevent the new structure from sinking using the reaction force of the existing structure. There is a construction method that allows this to occur, but if the base area of the existing structure is wide, there are drawbacks such as the loss of a large number of jacks and the impossibility of constructing both structures.

This invention eliminates the drawbacks of the conventional method as described above,
The purpose is to provide a construction method that does not cause subsidence to existing structures.

In the construction method according to this invention, after temporarily supporting an existing structure with a material, a new structure is constructed underground directly below it, and a brightness intensifier is placed between the new and existing structures. By injecting a brightening material under pressure and allowing it to expand and harden, the dead weight of the existing structure is transferred to the new structure, thereby causing only the new structure to sink and joining both structures together. .

Furthermore, as a conventional brightness intensifier, one shown in FIG. 1 is known. The brightness intensifier V is equipped with a cloth bag 10 having coarse mesh that allows sand to pass through but cement milk to pass through. Mortar 19 is injected under pressure into the cloth bag 10 through an injection pipe 14 equipped with a valve 12, and cement milk oozes out from the coarse mesh. , the mortar 19 is adapted to expand and harden.

However, such a brightness intensifier V does not easily lose its fluidity because the water in the injected mortar 19 leaches out through the coarse mesh.
It had the disadvantage of poor injection efficiency.

The object of the present invention is to eliminate the above-mentioned drawbacks of the conventional products and to provide a brightening material whose fluidity is not impaired.

The brightness intensifier of the present invention includes an outer bag having coarse mesh and a waterproof bag housed inside the bag, and an injection tool for injecting the brightness agent under pressure into the inner and outer bags. It is something that

The invention will be described with reference to illustrated embodiments.

First, the brightness intensifier used in the construction method of this invention will be explained.

As shown in FIG. 2, the brightness intensifier 9 includes an external cloth bag 10 having coarse mesh, and a waterproof cloth bag 1 housed inside the cloth bag 10.
1. Hotei 10.11 has Pal 1bu 12,
Injection pipes 14 and 15 on which 1B is deposited are connected to each other, and an exhaust pipe 17 to which a valve 16 is attached is connected to the cloth bag 11 inside.

1 g of cement paste is press-fitted into the external cloth bag 10 through the injection pipe 14, and the large redness of the eyes of the cloth bag 10 is such that a part of it oozes out when the cement paste 18/ is press-fitted at a pressure close to the design pressure. and
Made of chemical fiber. The material to be injected into the cloth bag 1O is not limited to the cement paste 18, but any stable material that can be injected in a fluid state, a portion of which leaches out from the fabric grains, and has high curing strength may be used.

Mortar 19 is injected into the inner cloth bag 11 while air is exhausted from an exhaust pipe 17, and the cloth bag 11 is made of waterproof chemical fiber or resin-coated glass fiber to prevent the mortar 19 from seeping out.

The material injected into the cloth bag 11 may be mortar 19 with fine aggregate added.

Note that the inner and outer cloth bags 1G and 11 may be intermittently sewn and partially joined to avoid separation of the two.

Another embodiment is shown in FIG. 3, in which the brightness intensifier 9a has reinforcing bars 1120 arranged inside a cloth bag 11.

FIG. 4 shows still another embodiment, in which the brightness intensifier 9
b shows a steel frame body 21 disposed inside the inner cloth bag 11.

Next, the construction method of this invention will be explained.

As shown in FIG. 6, support piles 2m and 2b are driven into both sides of the existing structure 1 supported by foundation piles 7, and the foundation 3 of the structure 1 and the temporary support 4 are connected. When the jack 5 is placed between the temporary support 4 and the support piles 2m and 2b, and the jack 5 is operated to lift up the temporary support 4, the structure 1 (7) bottom level X, -X, The dead weight W of the structure 1 is successively transferred to the support piles 2m and 2b without changing, and as a result, the support piles 2m and 2b sink by -3, #t, and finally the support piles 2m and 2b are tortoise and R1. In charge of the reaction force, structure 1, provisional support 4 and support pile 2m,
2b is stable in a state of rest. After this, a temporary support material 6 is installed between the temporary support girder 4 and the support piles 2m and 2b.
, and remove the jack 5 to complete the temporary receiving work.

In this state, the conditions R, +R, =tW are assumed.

Next, excavation is made directly under the structure 1, and the foundation M7 is removed to construct the new structure 8. Thereafter, a brightness intensifier 9 as shown in FIG.
(or the brightness intensifiers 9m and 9b shown in Figures 3 and 4)
The brightness intensifier 9 is expanded and hardened by injecting 18% cement paste into the outer cloth bag 10 and mortar 19 into the inner cloth 5&ll.
When the light filler 9 expands, the weight W of the structure 1 is used as a reaction force to cause the structure 8 to sink by J.

Due to the hardening of the brightness intensifier 9, the two structures 1.8 of f# are joined together, and the adjacent structures 9 are joined to each other by the cement paste 18 leached from the external cloth bag 10, and with this, the main receiver is ready for work f. - It ends.

This invention is as described above, and a brightness intensifier is placed between both FLR structures, and the brightness intensifier is injected under pressure into the brightness intensifier to cause it to expand and become i. Since the current is transmitted to the newly constructed structure, the newly constructed structure sinks beforehand and then the two structures are joined, so that the existing structure does not sink.

The brightness enhancer has a double structure in which a waterproof bag is housed inside a rough-mesh outer bag, so the fluidity of the brightness inside the inner bag is not impaired, and the brightness injection can be carried out efficiently.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional brightness intensifier in a broken state, Figs. 2 to 4 are drawings similar to Fig. 1 showing an embodiment of the intensifier of the present invention, and Fig. WJ5 is a temporary reception of the construction method of the present invention. 6 is a sectional view showing the state of construction, and FIG. 6 is a sectional view showing the state of construction. 1... Existing structure 2m, 2b... Support pile 4...
・Temporary support girder 8...New structure 9.9m, 9b・
...Brightening body 1G...Outer cloth bag 11...Inner cloth bag 14. ．． 1B... Injection pipe patent applicant Tekken Construction Co., Ltd. Figure 5

Claims (1)

[Claims] 1. After temporarily supporting an existing structure with a material, a new structure is constructed in the ground directly below it, and a filler is placed between the new structure and the existing structure. A new construction underground below an existing structure characterized by transmitting the weight of the existing structure to the trasakaki structure by pressurizing and injecting a filler material into the filler, tensioning it and hardening it. A construction method for constructing structures. 2.Equipped with an outer bag having coarse mesh, and an inner bag that is housed inside the outer bag and has waterproof properties, each of which is provided with an injection device for injecting filler under pressure into the inner and outer bags. A Hanawa light body used in the construction method according to claim 1, characterized in that: