JPH07216925A - Spring water drain structure construction method of underground structure and waterproofing sheet used - Google Patents

Abstract

PURPOSE:To secure a water cut-off capacity of jointed parts of adjacent waterproofing sheets, and to walk on the waterproofing sheets stably and easily. CONSTITUTION:A plurality of projected parts are diffusely formed, which lay out the end part of a first setting width with a central part 1Ma above a setting distance and project upwardly with a small amount of projection than a setting distance Land form a groove, which is communicated with a space below the end part, on the bottom of the central part 1Ma. A plurality of less, which project downwardly in the longitudinal direction with an amount of projection equivalent to the setting distance in a state forming a recessed part on the top of the end part 1Mc, are diffusely formed at an interval of a setting pitch to each end part 1Mc. Two types of waterproofing sheets are available where a main waterproofing sheet 1M, which comprises the recesses part and the 189 in such a fashion that they may be vertically fitted into each other and a sub waterproofing sheet 1S which is projected downwardly with an amount of projection equivalent to the setting distance in a state forming a recessed part on the top and which diffusely forms a plurality of legs vertically and horizontally in such a fashion that they may be fitted into the recessed part of the main waterproofing sheet 1M from above.

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 spring water discharge structure for an underground structure such as a basement of a building, more specifically, a rectangular waterproof sheet having an uneven bottom surface on an upper surface of a base floor. Are laid out so that the ends of adjacent ones are vertically overlapped with each other, and by forming a concrete slab on the waterproof sheet group using those waterproof sheets as a formwork, The present invention relates to a construction method for forming a spring discharge layer having a gap between a recess and a drainage channel between a foundation floor and a concrete slab, and a waterproof sheet used for the construction method.

[0002]

2. Description of the Related Art Conventionally, the following waterproof sheets have been used. That is, a plurality of container-shaped leg portions that form a concave portion that projects downward for a set distance and opens upward is formed on the entire surface at a set pitch in both vertical and horizontal directions.

[0003]

According to the above conventional technique, when the waterproof sheet is laid on the base floor, the lower ends of the legs are grounded to the upper surface of the base floor, and the edge of the waterproof sheet is grounded. The part will be located at a level above the upper surface of the base floor by a set distance. That is, the height of the end portion of the waterproof sheet from the foundation bottom plate in the installed state is determined by the protruding length of the leg portion.

Therefore, according to the conventional technique, in order to guarantee the waterproofness at the joint portion of the waterproof sheets in which the end portions of the adjacent waterproof sheets are vertically overlapped with each other, the joint portion is separated from the base bottom plate. The higher the position, the larger the protruding length of the leg.

On the other hand, the waterproof sheet is often composed of a thin synthetic resin (vinyl chloride, etc.) film having a thickness of about 0.4 mm in consideration of portability and economical efficiency. is there.

By the way, even when a waterproof sheet made of such a thin film and having a large protruding length of the leg is used, it is waterproof regardless of whether the concrete slab is formed on the waterproof sheet. A desired drainage channel can be reliably formed between the sheet and the base floor. In other words, when concrete is poured into the recesses of the waterproof sheet when it is placed, it is integrated with the legs and becomes a support leg for the concrete slab that is placed on the waterproof sheet, so that the concrete itself supports the weight of the concrete. As a result, a large load is not locally applied to the waterproof sheet, and the waterproof sheet is not crushed by the weight of the concrete slab.

However, when laying a waterproof sheet, or when performing a concrete slab forming operation such as a re-arrangement work and a concrete placing work after that, the waterproof sheet laid on the foundation floor is put on top. When a worker often walks, when the worker walks, the weight of the walking worker is applied to the portion of the tarpaulin stepped on by the walking worker. Will work. In such a case, if the waterproof sheet is thin as described above, the portion of the waterproof sheet stepped on by the pedestrian is crushed by the weight of the pedestrian, that is, stepped on.

Therefore, according to the above-mentioned conventional technique, if the waterproof sheet is made thin, when the worker walks on the waterproof sheet during the laying work of the waterproof sheet or the concrete placing work, the projecting length of the legs is reduced. Due to the large size, the amount of foot sinking due to trampling the tarpaulin is large, making walking on the tarpaulin unstable and difficult, and laying the tarpaulin and forming concrete slabs with poor workability. Was there.

An object of the present invention is to provide a waterproof structure at a joint portion of adjacent waterproof sheets, and, while using a thin waterproof sheet, can walk on the waterproof sheet stably and easily. A point is to provide a method for constructing a structure for discharging the spring water of a material and a waterproof sheet capable of implementing the method.

[0010]

The feature of the method for constructing a spring water discharge structure for an underground structure according to the first aspect of the present invention is that the central portion of the waterproof sheet is located at the lower end level, and The peripheral portion of the first set width located around the peripheral portion is arranged at the upper end level which is a set distance above the lower end level, and protrudes upward in the central portion by a protrusion amount smaller than the set distance and into a space below the peripheral portion. A plurality of gutter-shaped protrusions that form a communicating groove on the lower surface of the central portion are dispersedly formed, and a concave portion is formed on the upper surface of the end portion at each of the end portions along each of the four sides of the peripheral portion. In this state, a plurality of container-shaped leg portions projecting downward by a protrusion amount equal to the set distance are dispersedly formed at intervals of a set pitch in the longitudinal direction of the side, and the recesses and the leg portions can be fitted in the vertical direction. The main waterproof sheet of the structure constructed in a related manner and the concave portion is formed on the upper surface In this state, a plurality of container-like leg portions that protrude downward with a protrusion amount equal to the set distance and that can be fitted into the recesses of the main waterproof sheet from above are arranged at intervals of the set pitch in both vertical and horizontal directions. The point is to use two types of sub-waterproof sheet having a structure formed by dispersion.

The main waterproof sheet according to the second aspect of the present invention is
Of the waterproof sheets used in the construction method of the first invention, the invention relates to a main waterproof sheet, which is characterized in that the central portion is arranged at the lower end level, and the first setting is located around the central portion. The peripheral part of the width is arranged at the upper end level above the lower end level by a set distance, and the central part is provided with a groove protruding upward with a protruding amount smaller than the set distance and communicating with a space below the peripheral part. The plurality of gutter-shaped protrusions formed on the lower surface are dispersedly formed, and the set distance is equal to a state in which a recess is formed on the upper surface of the end at each of the ends along each of the four sides of the peripheral portion. A plurality of container-shaped legs that project downward with a projecting amount are dispersedly formed at intervals of a set pitch in the longitudinal direction of the side,
The point is that the concave portion and the leg portion are configured to be fitable in the vertical direction.

The sub-waterproof sheet according to the third aspect of the present invention is
The invention relates to a sub-waterproof sheet of a waterproof sheet used in the construction method of the first invention, which is characterized in that it projects downward with a projection amount equal to the set distance in a state where a recess is formed on the upper surface, This is that a plurality of container-like leg portions configured to be fitted into the recesses of the main waterproof sheet from above are dispersedly formed in the vertical and horizontal directions at the intervals of the set pitch.

The sub-waterproof sheet according to the fourth aspect of the present invention is
The invention relates to a sub-waterproof sheet among the waterproof sheets used in the construction method of the first invention, which is characterized in that a main portion except an end portion having a second set width equal to or larger than a set pitch has an upper surface. A plurality of container-shaped legs that are configured to be able to fit in the recesses of the main waterproof sheet from above while protruding downward with a protrusion amount equal to the set distance in the state of forming recesses in the vertical and horizontal directions. The point is that they are dispersed and formed at intervals of the set pitch.

[0014]

According to the main waterproofing sheet among the waterproofing sheets used in the construction method of the first invention, since the protruding amount of the leg portion formed at the end is equal to the set distance, the lower end of the leg portion is the same as the central portion. It will be located at the bottom level. As a result, the main tarpaulin will be grounded on the upper surface of the foundation bottom plate at the center portion located at the lower end level and the lower ends of the legs formed at the ends when it is laid on the foundation bottom plate. Of the drainage from the foundation bottom plate, the drainage from the foundation bottom plate to the central part is performed by the groove formed on the lower surface of the center part, and the drainage from the bottom part to the bottom part of the bottom part of the center part. It is done between the legs.

As described above, since the central portion and the end portions are configured to be grounded to the foundation bottom plate in such a state that they can be drained from their lower surfaces by separate constitutions, the central portion and the end portions are separated from the lower end level of the upper end level. The height, that is, the set distance can be freely selected and set, so that the height of the seam of the adjacent tarpaulin seams from the foundation bottom plate when laid on the foundation bottom plate The height can be sufficiently and reliably exhibited.

[0016] And, in the central portion which is grounded to the foundation bottom plate,
Although the gutter-shaped protrusions for forming drainage grooves are provided, the amount of upward protrusion of the gutter-shaped protrusions is smaller than the set distance, so the gutter-shaped protrusions are crushed as the user walks. If this is done, the amount of foot depression that accompanies the trampling can be reduced. In other words, the main waterproof sheet can be made thin, and the central portion can be a walking surface that allows stable walking. Furthermore,
Since the central part of the main waterproof sheet is for walking,
It is not necessary to walk the end portion, and this also allows the walkability to be excluded from the design requirements of the end portion, and the height of the end portion can be freely set.

Moreover, since the end is grounded when it is laid on the foundation bottom plate and a plurality of legs are formed on the upper surface of the end to form the recess, the cast concrete enters the recess. , The legs and the concrete that has entered into the recess of the legs are integrated, and act as a supporting leg for supporting the concrete placed on the ends, whereby the ends are removed from the foundation floor plate as described above. It is possible to prevent the end portions of the main waterproof sheets from being flexibly deformed downward due to the weight of the cast concrete, and to ensure that the end portions of the adjacent main waterproof sheets are overlapped with each other even when the main waterproof sheets are positioned high.

In addition, since the leg portion and the concave portion are configured to be fitted in the vertical direction, when the end portions of the adjacent main waterproof sheets are superposed in the vertical direction, they are accompanied by the superposition. Thus, the leg portion of the end portion that overlaps with the upper side can be fitted from above into the recessed portion of the end portion that overlaps with the lower side. By fitting the leg portion and the recessed portion, relative horizontal movement between the adjacent main waterproof sheets can be achieved. The main waterproof sheets can be prevented from being misaligned due to the walking of the main waterproof sheets while they are laid on the base floor, and the main waterproof sheets can be stably spliced to maintain good waterproofness at the spliced part. You can

On the other hand, according to the sub-waterproof sheet, the bottom of the legs is grounded at the lower ends of the legs when laid on the bottom of the foundation, and the drainage from the space between the bottom of the legs in the laid state is the leg. It is done by between.

Since the grounding is performed in the laid state on the foundation bottom plate and the plurality of legs forming the recesses are formed on the upper surface, the cast concrete enters the recesses like the main waterproof sheet, The leg portion and the concrete that has entered the concave portion thereof are integrated and act as a supporting leg for supporting the concrete that has been cast on the upper part, whereby deformation due to the weight of the cast concrete can be prevented.

Moreover, the protrusion amount of the leg is set as the set distance,
Since the end is located at the same level as the end of the main tarpaulin when it is laid on the base floor, the base bottom should be located next to the part where the main tarpaulin is laid. When laying, it can be joined to the main waterproof sheet in a state where the end portion is overlapped with the end portion of the main waterproof sheet.

In addition, since the leg portions are constructed so that they can be fitted into the recesses of the main waterproof sheet from above, and a plurality of the leg portions are arranged in both vertical and horizontal directions at a set pitch, the main waterproof sheet is provided. When laying them in a state of being overlapped with the end of the sheet, when laying them together, the leg formed on the part of the leg that overlaps the end of the main tarpaulin will be By fitting from above, the main waterproof sheets can be spliced together in a good water-proof state, and can be used together with the main waterproof sheet, as in the case of splicing the main waterproof sheets together. of course,
By selecting the legs lined up in the splicing direction and fitting them in the recesses of the main waterproof sheet, the overlap margin to the end of the main waterproof sheet is changed, that is, the width of the portion laid on the base floor, that is, The laying width can be adjusted. More specifically, by selecting one of the legs located at the end on the main waterproof sheet side in the splicing direction, it is possible to minimize the overlap margin to the main waterproof sheet and maximize the laying width. By selecting the second one from the end on the side, the laying width can be made the width obtained by subtracting the set pitch from the maximum width. By adjusting the margin, the laying width can be changed by the set pitch.

When the main waterproof sheet is cut at the central portion to change the width of the main waterproof sheet, when the cut end portions of the other main waterproof sheets are overlapped and spliced, the main waterproof sheet is joined to the spliced portion. It is necessary to use the main tarpaulin without cutting it and to stack the adjacent main tarpaulins at the ends because there is a gap between the top and bottom and it becomes impossible to maintain the waterproofness. That is, when using only the main waterproof sheet of the same size as the waterproof sheet, the width of the main waterproof sheet is ML, the first set width (that is, the overlapping margin) of the end portion is L1, and the main waterproof sheet is used. If the number is n, the width of the base floor is ML × n−L1 × (n
In the case of -1), the main waterproof sheet can be laid in a state of covering the base bottom plate over the entire width and forming a drainage layer over the base bottom plate over the entire width of the base bottom plate.

However, if the base bottom plate has a width other than the above, the main waterproof sheet cannot be laid so as to cover the base bottom plate over the entire width, and no waterproof sheet is laid on the base bottom plate, that is, covered with the waterproof sheet. There are some parts that cannot be ignored.

Specifically, as a form of laying the waterproof sheet on the base bottom plate, the waterproof sheet is laid in order from one end side to the other end side with one end in the width direction of the base bottom plate as a reference. There is a form and a form in which the base is laid from both end sides toward the center with both ends in the width direction as a reference. The width of the base plate is ML × n−L1 × (n−
If not 1), when laying the main waterproof sheet in the former form, the end portion at the time of the rising portion such as the wall or the pillar, which is the other end in the width direction, of the foundation bottom plate becomes the unlaid portion, and When laying the main waterproof sheet in the latter form, the intermediate portion located in the middle in the width direction of the base floor becomes the unlaid portion.

When the unlaid portion is generated in this way, if the width of the unlaid portion is small, a simple repair for closing the gap between the main waterproof sheet and the rising portion or the gap between the main waterproof sheets with tape or the like. By performing the work, it is possible to prevent the concrete from entering the bottom of the waterproof sheet through the gaps during the concrete pouring afterwards and to maintain the desired drainage performance, but if it is large, it is very possible to close the gaps. It becomes difficult to obtain the desired drainage performance. However, by preparing multiple types of main waterproof sheets with different widths and selecting them appropriately, it is possible to prevent the occurrence of unlaid parts or to make small widths that can be easily repaired. Not only does the production efficiency of the tarpaulin deteriorate and the cost increases, but it also requires the troublesome work of selecting the type of main tarpaulin for laying the tarpaulin, and the workability of laying the tarpaulin is improved. Make it worse.

Focusing on the above points, according to the construction method of the present invention, since the two types of waterproof sheets, the above-mentioned main waterproof sheet and sub-waterproof sheet, are used, the waterproof sheet of the base floor is laid. The part that is not open can be made smaller.

That is, in order to simplify the story, the leg portion is formed on the entire sub-waterproof sheet body, and the leg width is
The sub-waterproof sheet part protruding from the main tarpaulin when it is joined to the main tarpaulin in a state where it is grounded to the base floor board with only one row of legs located at one end in the width direction of the sub tarpaulin (on the base floor board) The width of the sub-waterproof sheet is P × N, and the minimum width of the sub-waterproof sheet is P × N, and the number of leg rows arranged in the width direction is N. The laying width LS of the sub-waterproof sheet is a multiple of P and is maximum P × (N−
Takes the value of 1). Therefore, when a plurality of main tarpaulins are laid on the base floor so that the end portions of adjacent ones are overlapped with each other in the width direction, when the main tarpaulin is not laid, the width of the unlaid portion of the base floor is If it is P × (N−1) or less and is a multiple of P, a sub-waterproof sheet can be laid on this unlaid portion to eliminate the unlaid waterproof sheet. In other words, the width of the unlaid portion can be less than P by using only two types of waterproof sheets.

When the width of the sub-waterproof sheet is made smaller than that of the main water-proof sheet, the width of the unlaid portion generated by laying only the main water-proof sheet becomes larger than the width of the sub-waterproof sheet. However, in such a case,
By laying the sub-waterproof sheet at a plurality of positions in the width direction of the base bottom plate, the width of the unlaid portion that finally remains can be made less than P.

Particularly, when the sub-waterproof sheet of the fourth invention is used, since it has the end portion of the second set width without the leg portion, the second set width is set to the set pitch P or more. By setting, even if an unlaid portion with a width of a multiple of P + α (α is less than P) remains on the base floor, by laying a sub-waterproof sheet, the unlaid portion can be ensured. It can be lost.

That is, when the waterproof sheet is laid in the former form and the unlaid portion remains,
By splicing the sub-waterproof sheet to the main waterproof sheet so that the end of the second set width is bent upward and applied to the rising portion, the unlaid portion can be surely covered with the sub-waterproof sheet (Fig. 15)), and when the unlaid portion remains by laying the waterproof sheet in the latter form, one of the main waterproof sheets has the other end so that the end of the second set width is overlapped with the other. By joining it to the end of the main waterproof sheet, the unlaid portion can be surely covered.

[0032]

Therefore, according to the present invention, the adjoining waterproof sheets can be joined stably and reliably at a high position from the base bottom plate to ensure the waterproofness of the joining portion, and Even if you use a thin body, you can stabilize and facilitate walking by reducing the foot's depression due to the trampling of the tarpaulin when walking on the tarpaulin when laying a tarpaulin or creating a concrete slab. By doing so, it is possible to walk on the waterproof sheet and work safely with good workability. Moreover, the unlaid portion that occurs can be made small enough to be easily repaired with tape or the like. Or, even though it can be eliminated, the use of two types of tarpaulin, a main tarpaulin and a sub tarpaulin, facilitates workability and inexpensively discharges spring water. It becomes possible to provide the waterproof sheet to spring water discharged structure construction method of underground construction that enables the creation and use it.

In particular, according to the fourth aspect, since the unlaid portion can be surely eliminated, a spring water drainage layer having a better workability can be formed.

[0034]

EXAMPLE As shown in FIGS. 1 and 2, a partition wall W2 having an inner pillar C2 arranged at a set span is provided in a basement surrounded by an underground wall W1 having a pillar C1 arranged at a set span. The underground structure in which the central chamber is partitioned and formed has a spring water discharge structure for discharging spring water that has permeated the underground outer wall W1 and the concrete base floor F to the underground pit UP.

In the spring discharge structure, a gutter SD for collecting water is formed at the underground outer wall W1 of the foundation floor F, and the gutter SD is formed.
The drainage pipe D from the hall G formed between the adjacent pillars C1 to the underground pit UP is embedded in the foundation floor F, and the foundation floor F and the concrete slab S containing the mesh reinforcement Sa formed on the foundation floor F are installed. , And a spring discharge layer for discharging the spring water to the gutter SD, the underground pit UP, and the relay hall Ga.

At the lower end of the partition wall W2, a drainage for allowing the spring water to flow down from a portion of the spring discharge layer located between the underground outer wall W1 and the partition wall W2 to a portion surrounded by the partition wall W2. The pipes DP are embedded at a predetermined pitch.

The spring discharge layer has a rectangular waterproof sheet 1 for spring water treatment, in which the upper surface of the base floor F is formed to have a predetermined water gradient, and the lower surface of the base floor F has an uneven surface. A plurality of them are laid side by side so that their end portions overlap each other in the vertical direction, and the concrete slab S is formed by casting on the group of waterproof sheets 1 using these waterproof sheets 1 as a mold. . In other words, this spring discharge layer is configured such that the gap between the base floor F and the recess on the lower surface of the waterproof sheet 1 serves as the drainage channel 2.

A portion of the side groove SD having a U-shaped plan view around the column C1 is, as shown in FIGS. 3 and 4,
It is composed of an underdrain U whose upper part is covered with a concrete slab S. From the spring discharge layer, gutter SD / relay hall Ga
-The drainage means to the underground pit UP is a means for opening the spring discharge layer to them, as shown in Figs. 1 and 5.
The drainage means from the spring discharge layer to the underdrain U is, as shown in FIGS. 3 and 4, arranged with a plurality of lids Ua for the underdrain U in a state in which a gap d1 of about 50 mm is opened between them. It is a means for connecting the spring discharge layer to the inside of the underdrain U.

There are two kinds of the waterproof sheets 1, one of which is a main waterproof sheet 1 having a square shape in plan view as shown in FIG.
As shown in FIG. 10, the other is a sub-waterproof sheet 1S having a rectangular shape in a plan view, and these are synthetic resin sheets manufactured by compression molding or vacuum molding, and have shape retention. In this example, it is made of a vinyl chloride film having a thickness of 0.4 mm.

As shown in FIGS. 6 to 8, the main waterproof sheet 1M has the central portion 1Ma at the lower end level and the peripheral portion of the first set width L1 located around the central portion 1Ma at the lower end. They are arranged at the upper end level above the set distance L. In the central portion 1Ma, a plurality of trough-shaped protruding portions 4 that protrude upward with a protruding amount smaller than the set distance L and form a groove 3 communicating with the lower space of the peripheral portion on the lower surface of the central portion 1Ma. They are arranged and formed in a vertical and horizontal lattice pattern. That is, the lower surface of the central portion 1Ma is divided by a plurality of grooves 3 which are arranged in a vertical and horizontal lattice pattern and intersect with each other.

A state in which each of the end portions 1Mc along each of the four sides located between the corner portions 1Mb of the peripheral portion has a substantially square shape in plan view, and a recess 5m is formed on the upper surface of the end portion 1Mc. In addition, a plurality of container-shaped leg portions 6m projecting downward with a protrusion amount equal to the set distance L are formed in a distributed manner at intervals of a set pitch P in the longitudinal direction of the side. Two rows in which the leg portions 6m are arranged are formed in two rows, and the row pitch is configured to be equal to the set pitch P.

Each of the corners 1Mb of the peripheral portion has a substantially square shape in plan view, and a recess 5M is formed on the upper surface of the corner 1Mb.
In the state of forming, the container-shaped large leg portions 6M that protrude downward with a protrusion amount equal to the set distance L are formed one by one.

Therefore, when the main waterproof sheet 1M is installed on the base floor F, the bottom surface of the central portion 1Ma, the bottom surface of the legs 6m, and the bottom surface of the large leg 6M are grounded on the base floor F. Therefore, the groove 3 serves as a drainage channel between the central portion 1Ma and the foundation bottom plate F, and is provided between the leg portions 6m and the leg portions 6m.
The concave portion on the lower surface of the peripheral portion formed between m and the large leg portion 6M serves as a drainage channel between the peripheral portion and the base floor F.

The protrusions 4 are arranged at a set pitch P so that the grooves 3 communicate with the recesses on the lower surface of the peripheral portion formed between the adjacent leg portions 6m in the side lengthwise direction.

The leg portion 6m and the large leg portion 6M will be described in detail. All the legs 6m are tapered and have the same shape and the same size, and are configured to be vertically fittable with the recesses 5m formed by them.
That is, as shown in (a) of FIG. 9, in the state where the main waterproof sheet 1M is laid on the base floor F so that the end portions 1Mc of the adjacent main waterproof sheets 1M overlap each other in the vertical direction, The leg portion 6m of the end portion 1Mc that overlaps with the upper side is configured to fit into the recess 5m of the end portion 1Mc that overlaps. The four large legs 6M have the same tapered shape, and
Recesses 5 formed in the same size and formed by each of them
It is configured such that it can be fitted to M in the vertical direction. That is, as shown in FIG. 9B, the adjacent main waterproof sheets 1
In a state in which the main waterproof sheet 1M is laid on the base floor F so that the corners 1Mb of M overlap with each other in the vertical direction, the large leg portion 6M that overlaps the upper side fits into the recess 5M of the corner 1Mb that overlaps the lower side. Is configured to. Further, the large leg portion 6M is configured to have a size larger than the leg portion 6m in a plan view (the vertical and horizontal widths are approximately twice each). That is, the four leg portions 6m arranged in two columns and two rows are configured to form the recessed portion 5M having a size capable of being fitted from above.

In the main waterproof sheet 1M constructed in this manner, when the end portions 1Mc of adjacent ones are vertically and horizontally arranged so as to overlap each other in the vertical direction and laid on the base floor F, one main waterproof sheet 1M In the corner portion 1Mb, the corner portion 1Mb of the main waterproof sheet 1M adjacent in the horizontal direction, the corner portion 1Mb of the main waterproof sheet 1M adjacent in the vertical direction, and the corner portion 1Mb of the main waterproof sheet 1M adjacent in the diagonal direction. There is a 4-ply overlapped part. Moreover, the first set width L1 of the peripheral portion is configured to be twice the set pitch P.

The sub-waterproof sheet 1S is shown in FIGS.
As shown in FIG. 1, the main waterproof sheet 1M is a rectangular one having a long side equal to one side, and the set pitch P is
In the main portion 1Sa excluding the end portion 1Sc at one end in the width direction (longitudinal direction of the short side) having the second set width L2 described above, the protrusion amount equal to the set distance L is provided downward in the state where the recess 5s is formed on the upper surface. It has a structure in which a plurality of projecting container-shaped legs 6s are dispersedly formed in the vertical and horizontal directions at the intervals of the set pitch P.

Therefore, this sub-waterproof sheet 1S, when laid on the base floor F, is grounded on the base floor F by the legs 6s to form a drainage channel between the legs 6s. The second set width L2 is the same as the first set width L1.

The leg portion 6s has the same shape and the same size as the leg portion 6m of the main waterproof sheet 1M. That is, as shown in (a) and (b) of FIG. 12, the main waterproof sheet 1M is fitted from above from the concave portion 5m formed by the leg portion 6m of the main waterproof sheet 1M in a state of overlapping with the upper end portion 1Mc of the main waterproof sheet 1M. Also, the leg portion 6m of the main waterproof sheet 1M is fitted from above into the recess 5s formed by the end portion 1Mc of the main waterproof sheet 1M which overlaps with the lower side thereof.
As shown in (c) and (d) of FIG. 12, the concave portion 5M formed by the large leg portion 6M can be fitted from above in a state of four pieces arranged in two columns and two rows. Can be fitted into the recess 5s of the adjacent sub-waterproof sheet 1S.

Therefore, when the sub-waterproof sheet 1S is placed at the lateral position of the main waterproof sheet 1M, as shown in FIG.
The leg portion 6s of the main portion 1Sa is replaced with the recess portion 5 of the main waterproof sheet 1M.
m and 5M, a part of the main portion 1Sa is overlapped with the end portion 1Mc and the corner portion 1Mb of the main waterproof sheet 1M, and joined to the main waterproof sheet 1M in the same manner as the main waterproof sheets 1M. Main waterproof sheet 1 that can be fitted
Main waterproof sheet 1M by changing the overlap margin with M
Amount of protrusion from the sub-waterproof sheet 1S is the base floor F
The laying width LS laid above can be changed. The amount of change in the laying width LS is such that the leg portion 6s
Since the change width of the overlapping margin is restricted to the set pitch P by fitting into the concave portion 5m of the main waterproof sheet 1M, the change is performed by the set pitch P. As for the minimum value of the laying width LS, the one in the first row counting from the end 1Sc side of the leg 6s is the recess 5m,
Value when mated to 5M and spliced together (that is, the second
The setting width is L2), and the maximum value is (a) (c) in FIG.
As shown in, the values are values when the first row and the second row of the legs 6s counting from the side opposite to the end 1Sc are fitted into the recesses 5m and 5M and joined together. The legs 6s
The maximum value may be the value when only the one in the first row counted from the side opposite to the end 1Sc is fitted into the recesses 5m and 5M and joined together.

By the way, to give an example of real numerical values of each part of the main waterproof sheet 1M and the sub-waterproof sheet 1S, the main waterproof sheet 1M
Has a width ML of 1000 mm, the short side width SL of the sub-waterproof sheet 1S is 550 mm, the first set width L1 and the second set width L
2 is 100 mm, set pitch P is 50 mm, set distance L
Is 40 mm.

Next, a method of constructing the spring discharge structure will be described. A plurality of waterproof sheets 1 are laid on the base floor F so as to cover the entire surface of the base floor F by arranging them side by side in the vertical and horizontal directions so that the ends of adjacent ones vertically overlap each other.

The basics of laying the waterproof sheet 1 are as follows. In order to simplify the story, as shown in (a) of FIG. 13, if it is considered that the plan view shape of the base floor F on which the waterproof sheet 1 surrounded by the rising portion R is to be laid is rectangular, Regarding the lateral width direction of F, the waterproof sheet 1 is laid in order from the one end side to the other end side with one end in the lateral width direction as a reference. The waterproof sheet 1 is laid in order from the one end side to the other end side with reference to, and the width w of the unlaid portion f on the other end side where the waterproof sheet 1 is not laid is the main waterproof sheet 1M. Of the main waterproof sheet 1M until the width becomes smaller than the value (working) obtained by subtracting the first set width L1 from the width ML of the main waterproof sheet 1M (i.e., the width at which the main waterproof sheet 1M cannot be laid). On the unlaid part f where Than is laying a waterproof sheet 1S. That is, of the rows of the waterproof sheet 1, only the last row is composed of the sub-waterproof sheet 1S, and all the other rows are composed of the main waterproof sheet 1M. As the unlaid portion f, as shown in (b) of FIG. 13, a width w that is smaller than the function but larger than the maximum value of the laid width LS of the sub-waterproof sheet 1S may occur. In this case, as shown in FIG. 13C, the main waterproof sheet 1M
One sub-waterproof sheet 1S is mixed in the row, and the width w of the unlaid portion f is made smaller than the maximum value of the laid width LS of the sub-waterproof sheet 1S. Then, as shown in FIG. 14, the end of the main waterproof sheet 1M located at one end in the width direction and the rising portion R are closed so that the concrete cast on the waterproof sheet 1 is not covered between them. Tape 7 to prevent leakage through the main waterproof sheet 1M
Connect with. On the other hand, as shown in FIG. 15A, the sub-waterproof sheet 1S located at the other end in the width direction is applied to the rising portion R in a state where the end portion 1Sc is bent upward, that is, the unlaid portion f. The laying width LS is adjusted so as to have a value slightly larger than the width w of the waterproof sheet 1 and the end portion 1Sc and the rising portion R of the sub-waterproof sheet 1S are closed by closing them. Connection is made with a tape 7 that prevents the concrete cast on the top from leaking under the sub-waterproof sheet 1S through them. Note that (b) in FIG.
As shown in, the distance Ls from the end of the main portion 1Sa of the sub-waterproof sheet 1S to the rising portion R is a set pitch P, that is,
When it exceeds half of the second set width L2, as shown in (c) of FIG. 15, the distance Ls is set to the set pitch P by reducing the overlap margin of the sub-waterproof sheet 1S on the main waterproof sheet 1M by one pitch. Within the range, the sagging deformation of the end 1Sc due to the weight of the cast concrete slab S is prevented,
Try to prevent leaks under the concrete.

Specifically, as shown in FIG. 16, the end of the base floor F on the side of the outer underground wall W1 is used as a reference,
The main waterproof sheet 1M is laid so as to leave the unlaid portion f on the partition wall W2 or the pillar C1, and the sub waterproof sheet 1S is laid on the remaining unlaid portion f.
For one case, the three sub-waterproof sheets 1S are laid so as to be adjacent to each other in a U-shape arrangement in plan view and to overlap the main waterproof sheet 1M. At this time, as also shown in FIG. 3, in order to increase the strength of the sheet portion located above the gap d1 of the lid Ua and suppress the bending due to the concrete weight, the overlapping portion of the adjacent sub-waterproof sheet 1S has a lid Ua. It is preferable to be located above the gap d1.
End 1M of the main waterproof sheet 1M located at the end of the row
As shown in FIG. 17, the accommodation process of c is performed by using the side formwork 8 for making the concrete slab as the rising portion R, and the accommodation process of the end portion 1Sc of the sub-waterproof sheet 1S is performed as shown in FIG. In the case of the wall W2, the partition wall W2,
In the case of the pillar C1, the pillar C1 is used as the rising portion R. A sub-waterproof sheet 1S is laid on a portion of the base bottom board F surrounded by the partition wall W2.

Then, on the waterproof sheet 1, a plurality of spacers 9 for receiving the mesh lines Sa are dispersedly arranged.

As shown in FIGS. 19 and 20, the spacer 9 is formed by attaching a plurality of bifurcated legs 9b to the receiving rod 9a for receiving the mesh muscle Sa at intervals in the longitudinal direction of the receiving rod. The length of the receiving rod 9a is configured to be the length obtained by subtracting the first set width L1 from the width ML of the main waterproof sheet 1M, and the foot 9b has a shape and a shape capable of entering the two adjacent recesses 5m. It is constructed in size.

As shown in FIG. 21, the spacers 9 are disposed at the joints between the adjacent waterproof sheets 1, the central portion of the main waterproof sheet 1M in the width direction, and the waterproof sheets located at the row ends. 1 end part etc. can be mentioned. Then, when arranging in the splicing part, the foot 9
When all of the b are inserted into the recesses 5m, 5M to be grounded and arranged at the center, the foot 9b located at one end in the longitudinal direction of the receiving rod is inserted into the recesses 5m, 5M of the splicing part and grounded. When arranging in parts, the recesses 5 in the two rows at the end
Insert foot 9b into m and ground.

After the spacers 9 are arranged, the mesh lines Sa are arranged and concrete is placed on the group of waterproof sheets 1 to form the concrete slab S on the base floor F. The concrete slab S on the underground pit UP is prepared by setting a formwork for receiving the concrete slab S, which is not shown, and placing the concrete slab S on it. 2, FIG. 4, FIG. 5, FIG. 19, and FIG. 20, the waterproof sheet 1 is in a state of floating from the foundation bottom plate F for the sake of clarity. It is grounded at F. [Other Embodiments] In the above embodiment, the main waterproof sheet 1M has the corners 1Mb provided with the large leg portions 6M. However, as the main waterproof sheet 1M, as shown in FIG.
The corner portion 1Mb may also be formed with the leg portion 6m of the end portion 1Mc.

In the above embodiment, the sub-waterproof sheet 1S has the end portion 1Sc without the leg portion 6s, but the sub-waterproof sheet 1S has the leg portions 6s over the entire surface as shown in FIG. It may be formed by dispersion. In this case, as shown in FIG. 24, when the width w of the unlaid portion f is not a multiple of the set pitch P, a gap d2 is generated between the edge of the sub waterproof sheet 1S and the rising portion R. Since d2 is smaller than the set pitch P, the tape 7 is stretched over the edge of the sub-waterproof sheet 1S and the rising portion R to easily close the gap d2 and prevent concrete from entering the sub-waterproof sheet 1S lower side. be able to.

In the above-mentioned embodiment, the main waterproof sheet 1M has two leg rows in which the plurality of leg portions 6m are arranged at the set pitch P at the end portion 1Mc. Alternatively, one leg row may be arranged at the end 1Mc.

In carrying out the construction method of the present invention, two types of the main waterproof sheet 1M shown in the other embodiment and the sub-waterproof sheet 1S shown in the embodiment are used as the waterproof sheet 1. It is also possible to use two types of the main waterproof sheet 1M shown in the embodiment and the sub-waterproof sheet 1S shown in the other embodiment as the waterproof sheet 1, and
The main waterproof sheet 1M shown in the embodiment and the main waterproof sheet 1M shown in the other embodiment may be mixed and used.
The sub-waterproof sheet 1S shown in the embodiment and the sub-waterproof sheet 1S shown in the other embodiment may be mixed and used.

In the above embodiment, the main waterproof sheet 1M has a square shape in plan view.
The shape of M may be rectangular in plan view. In the case of a rectangle, the action on the long side is preferably a multiple of the action on the short side, but it does not have to be so. The function of the main waterproof sheet 1M is a multiple of the unit length (for example, when the standard unit length is 900 mm, which is a standard for creating an underground structure such as between columns or beams (for example, 900 mm or one space). , 1/3 times, 1/2 times, 2/3 times, 1: 1 times, 2 times, etc.), but need not be so. That is, when the unit length is a multiple, the main waterproof sheet 1
It is easy to allocate M, and it is easy to make the width w of the unlaid portion f a multiple of the set pitch P.

In the above embodiment, the sub-waterproof sheet 1S has a rectangular shape in a plan view and an aspect ratio of about 2: 1. However, the aspect ratio can be changed appropriately and the sub-waterproof sheet 1S can be used. May be square or nearly square.

In the above embodiment, the sub-waterproof sheet 1S has a width equal to that of the main water-proof sheet 1M. However, a plurality of sub-waterproof sheets 1S are arranged in a state where the end portions are overlapped in the width direction. It may have a width corresponding to the width of the main waterproof sheet 1M when it is opened.

In the case where the main waterproof sheet 1M has to be laid on the upper side of the underdrain U because the underdrain U is formed in the center of the foundation bottom plate F or the like, as in the above-mentioned embodiment, the adjacent main waterproof sheet is used. It is preferable to arrange the 1M spliced portion so as to be located above the gap d1 between the lids Ua of the underdrain U. That is, it is preferable to dispose the lid Ua so that the gap d1 is located below the spliced portion of the adjacent main waterproof sheets 1M. In this case, in addition to the advantages similar to those of the above-described embodiment, the drainage channels 2 having good drainability formed by the large recesses formed between the leg portions 6m are located on the gap d1 and on both sides in the longitudinal direction thereof. Since it will be located in a series of states over the upper part of the bottom plate F, for example, as compared with the case where the central portion 1Ma of the main waterproof sheet 1M is located above the gap d1, the base plate F is on the base plate F. The spring water can smoothly flow into the gap d1 from the above, and the central portion 1Ma can be stably grounded to the lid Ua.

In the above embodiment, the main waterproof sheet 1M is laid from one end side in the width direction of the base floor F, and the sub-waterproof sheet 1S is laid at the other end in the width direction. Although the sub-waterproof sheet 1S is arranged at the end where there is no chance of walking or there is little opportunity to walk, when the two sub-waterproof sheets 1S are installed in a row along the width direction, the sub-waterproof sheets 1S are placed. You may install at both ends of the width direction. In short, it is preferable to lay the sub-waterproof sheet 1S at a position where there is little or no chance of walking such as an edge of the base floor F in order to eliminate or reduce the footsteps, but The main waterproof sheet 1M may be laid from both ends in the width direction, and the sub-waterproof sheet 1S may be laid so as to extend between the main waterproof sheets 1M that are spaced from each other in the middle portion in the width direction. In this case, sub waterproof sheet 1S
As the arrangement form, the end portion 1 of one main waterproof sheet 1M
The end portion 1Sc overlaps Mc with an overlap margin of a set pitch P or more, and the main portion 1S overlaps with the end portion 1Mc of the other main waterproof sheet 1M.
There are a mode in which the sub-waterproof sheet 1S is arranged so that the ends of a overlap, and a mode in which the main portion 1Sa is arranged so as to overlap both main waterproof sheets 1M. When allocating the waterproof sheet 1 on the foundation bottom plate F, the main waterproof sheet 1 should be used as much as possible.
It is preferable to increase the number of M.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Plan view of the main part of the basement before laying a waterproof sheet

[Fig. 2] Vertical cross-sectional view of the main part of the underground structure

FIG. 3 is a perspective view of an underdrain.

[Fig. 4] Vertical sectional view of the underdrain

[Figure 5] Longitudinal section of the relay hall

FIG. 6 is a plan view of the main waterproof sheet.

FIG. 7 is an enlarged plan view of the main part of the main waterproof sheet.

8 is a cross-sectional view of each part of the main waterproof sheet, (a) is a cross-sectional view taken along the line (a)-(a) of FIG. 7, and (b) is (b) of FIG.
(B) is a cross-sectional view, (c) is a cross-sectional view of (c)-(c) line of FIG. 7, (d) is a cross-sectional view of (d)-(d) line of FIG.

FIG. 9 is a cross-sectional view of each spliced portion of main waterproof sheets.

FIG. 10 is a plan view of a sub-waterproof sheet.

FIG. 11 is a sectional view of a sub-waterproof sheet.

FIG. 12 is a cross-sectional view of a joint portion between a sub-waterproof sheet and a main waterproof sheet.

FIG. 13 is a plan view showing an arrangement example of a waterproof sheet.

FIG. 14 is a cross-sectional view showing an end portion of the main waterproof sheet.

FIG. 15 is a sectional view showing how the end portion of the sub-waterproof sheet is housed.

FIG. 16 is a plan view showing the arrangement of a sub-waterproof sheet.

FIG. 17 is a cross-sectional view showing a practical accommodation of the end of the main waterproof sheet.

FIG. 18 is a cross-sectional view showing practical accommodation of the end of the sub-waterproof sheet.

FIG. 19 is a vertical sectional side view of a spacer arrangement portion.

FIG. 20 is a vertical sectional front view of a spacer arrangement portion.

FIG. 21 is a plan view showing the arrangement of spacers.

FIG. 22 is a plan view of a main waterproof sheet showing another embodiment.

FIG. 23 is a plan view of a sub-waterproof sheet showing another embodiment.

FIG. 24 is a cross-sectional view showing how the end portion of the sub-waterproof sheet according to another embodiment is housed.

[Explanation of symbols]

 1 Waterproof Sheet F Foundation Bottom S Concrete Slab 2 Drainage Channel 1Ma Central Part L1 1st Setting Width L Setting Distance 3 Groove 4 Protrusion 1Mc End 5m Recess 6m Leg P Setting Pitch 1M Main Waterproof Sheet 5s Recess 6s Leg 1S Sub Waterproof sheet L2 2nd setting width 1Sc End part 1Sa Main part

Claims (4)

[Claims] 1. A plurality of rectangular waterproof sheets (1) whose lower surface is uneven are laid on the upper surface of a foundation bottom plate (F) so that the ends of adjacent ones vertically overlap each other. The concrete slab (S) is formed by casting on the waterproof sheet (1) group using the waterproof sheet (1) as a frame to drain the gap between the base floor (F) and the recess on the lower surface of the waterproof sheet (1). A method for constructing a spring water discharge structure for an underground structure, in which a spring water discharge layer to be a path (2) is created between a foundation floor (F) and a concrete slab (S), wherein the waterproof sheet (1) is , The central portion (1Ma) is arranged at the lower end level, and the peripheral portion of the first set width (L1) located around the central portion (1Ma) is set at the upper end level which is a set distance (L) above the lower end level. The set distance (L) is set in the central portion (1Ma). A plurality of gutter-shaped protrusions (4) are formed on the lower surface of the central portion (1Ma) to dispersely form grooves (3) protruding upward with a smaller protrusion amount and communicating with the lower space of the peripheral portion, In the state in which a concave portion (5 m) is formed on the upper surface of the end portion (1 Mc) at each of the end portions (1 Mc) along each of the four sides of the peripheral portion, a protrusion amount equal to the set distance (L) is applied downward. A plurality of projecting container-like legs (6m) are dispersedly formed in the longitudinal direction of the side at intervals of a set pitch (P), and the recesses (5m) and the legs (6m) can be fitted in the vertical direction. The main waterproof sheet (1M) having a structure configured as described above, and the main waterproof sheet (1M) that protrudes downward with a projection amount equal to the set distance (L) in a state where a recess (5s) is formed on the upper surface. A plurality of container-shaped legs (6s) that can be fitted into the recesses (5m) from above are vertically arranged. Spring water discharge structure construction method of underground construction using two kinds of the sub tarpaulin (1S) of the waveguide dispersion formed at intervals in both directions to the setting pitch (P). 2. A main waterproof sheet used in the method for constructing a spring water discharge structure for an underground structure according to claim 1, wherein the central part (1
Ma) is arranged at the lower end level and its central part (1M
The peripheral portion of the first set width (L1) located around a) is arranged at the upper end level above the lower end level by the set distance (L),
A plurality of grooves (3) are formed on the lower surface of the central portion (1Ma) so as to project upward in the central portion (1Ma) with a smaller amount of protrusion than the set distance (L) and communicate with the lower space of the peripheral portion. The gutter-shaped protrusions (4) are dispersedly formed, and the end portions (1Mc) are formed at the end portions (1Mc) along each of the four sides of the peripheral portion.
c) A plurality of container-like leg portions (6m) protruding downward with a protrusion amount equal to the set distance (L) in a state where a concave portion (5m) is formed on the upper surface of the c), and a set pitch (P) in the longitudinal direction of the side. The main waterproof sheet, which is formed in a dispersed manner at intervals of, and in which the concave portion (5 m) and the leg portion (6 m) can be fitted in the vertical direction. 3. A sub-waterproof sheet used in the method for constructing a spring water discharge structure for an underground structure according to claim 1, wherein a protrusion amount equal to the set distance (L) in a state where a recess (5s) is formed on the upper surface. A plurality of container-like leg portions (6s) which are configured to be capable of fitting downward into the concave portion (5m) of the main waterproof sheet (1M) from above and set the pitch (P) in both vertical and horizontal directions. ) A sub-waterproof sheet dispersed and formed at intervals. 4. The sub-waterproof sheet used in the method for constructing a spring water discharge structure for an underground structure according to claim 1, wherein the one end has a second preset width (L2) equal to or greater than a preset pitch (P). In the main part (1Sa) excluding (1Sc), a recess (5
s) is formed, the main waterproof sheet (1) is projected downward with a projection amount equal to the set distance (L).
A sub-waterproof sheet in which a plurality of container-shaped leg portions (6s) configured to be fitted from above into the concave portion (5m) of M) are dispersedly formed in the vertical and horizontal directions at the intervals of the set pitch (P). .