JP2513511B2 - Unit type thatched roof structure and its construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a unit type thatched roof structure applied to a building structure, more specifically, a systemized rafter member and a thatched roof plate member. The present invention relates to a unit type side-roof roof structure made of metal in a relatively simplified side-roof type configured in combination and a construction method thereof.

[Conventional technology]

Generally, as a roof structure applied to a normal-scale building structure and using a metal material for each main component, conventionally, there are two types of roof structures: a vertical roof type and a horizontal roof type. .

In the normal case, each of these types is on a mainboard material that is arranged in parallel (hereinafter also referred to as a horizontal direction) with the building direction of the roof structure that constitutes the roof structure to give a predetermined roof slope. Then, a plurality of rafter members are fixedly arranged in parallel at a predetermined interval so as to be orthogonal to the ridge direction (hereinafter, also referred to as vertical direction).

Then, in a state where a floorboard or the like is appropriately interposed, in the former vertical thatched roof structure, a vertical thatched roof plate member having side edge engaging portions on both sides in the longitudinal and longitudinal directions and a face plate portion at the center is used. Between each adjacent rafter member, directly in the state that a plurality of the vertical roofing plate members are arranged in the horizontal direction,
Alternatively, it is configured to be vertically raised by appropriately engaging and fixing an interposing member such as an engaging member.

In the latter side-roof structure, a side-roof roof member having an eaves-side engaging part and a ridge-side engaging part that can engage with each other adjacent to each other in the longitudinal and lateral directions, and a face plate part in the central part is used. Use a plurality of the thatched roof plate members, straddling each rafter member, in a stepwise manner with a low step in the vertical direction, or in a stepped manner so as to form a sawtooth shape, and Then, by appropriately using a suspender member to hold and fasten it, it is configured to be raised in the lateral direction.

[Problems to be Solved by the Invention]

However, the conventional structures of the vertical roof and the horizontal roof, which are roofed as described above, have respective advantages and disadvantages in application to general ordinary-scale building structures, and are subject. It is arbitrarily selected and used based on various requirements such as the intended use of the building structure and the surrounding environment, as well as the demand for the external form.

Here, in this case, regarding the horizontal thatched roof plate member used for the thatched roof structure, when comparing this with the vertically thatched roof plate member of the vertically thatched roof structure, the individual roof plate members for the roof surface are structurally independent. The coverage area per hit is relatively narrow, which is why its effective width dimension (that is, it corresponds to the roof width dimension on the roof surface and corresponds to the longitudinal and longitudinal lengths)
Is reduced, and thereby a good appearance design is obtained in addition to sufficient structural strength and an effective water-repellent action.

However, on the other hand, the roof structure with the above-mentioned structure is used for relatively small building structures, such as small houses, storage sheds, bungalows, barbecue houses, temporary buildings, etc., meeting places open to the outdoors, and rain shelters. When applied to a relatively small-scale building structure such as a place, as described above, the effective width of the horizontal roofing shingle member used is narrowed corresponding to the covering surface, so that the vertical roofing shingle is used. Even if the number of members and components is the same, there is a disadvantage that the number of steps of roofing work per unit area increases.

Further, because of its structure, the eaves side engaging portion and the ridge side engaging portion are engaged with each other vertically in the vertical direction to form a goby assembly structure, so that a space portion is inevitably formed on the back surface side of the face plate portion within the effective width range. Was formed, and it was easy for the corresponding face plate portion to bend due to the positive pressure applied from the outside.

Therefore, in order to prevent this, it is necessary to insert a so-called backup material (wood wool cement board, urethane foam board, etc.) that backs up the back side for each step of thatching, separately from the field board. there were.

In addition, joining members such as a discard plate are also required for joining between the longitudinal and lateral ends, and as a result, sufficient infiltration of rainwater into each part is prevented, as in a normal-scale building structure. If you have to take the measures of
When applying a structure similar to the traditional thatched roof to a relatively small-scale building structure that can be simplified to some extent, increase the number of man-hours required for construction. Including it, it became a factor to invite cost increase.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned conventional problems, and an object of the present invention is to apply a thatched roof structure to a comparatively small-scale building structure, in which a main constituent member thereof is used. We provide a unit-type thatched roof structure of this kind that is superior in structural strength and appearance design, and its construction method, by improving the workability during construction and reducing the cost by unitizing the That is.

[Means for solving the problem]

In order to achieve the above-mentioned object, the invention according to claim 1 is a groove type having a bottom portion and left and right side portions, and each roof plate engaging portion corresponding to a roof pitch interval at an upper portion of each side portion. In addition, at the eave-side steps corresponding to the engaging steps of the roof plates, the left and right step surfaces and the press-fit locking portions projecting above the step surfaces are left, and the side sections are bent inward or outward. Then, the left and right face plate receiving and supporting portions are respectively formed in a staircase shape or a sawtooth shape, and rafter members arranged on each purlin material at a predetermined pitch interval, and the same as the arrangement pitch interval in the longitudinal and lateral directions or A ridge-side engaging part is provided on one side edge, and a ridge-side engaging part is provided on the other side, which has an effective length that is an integral multiple, and leaves a central face plate part with an effective width that matches the above-pitch pitch interval in the lateral longitudinal direction. The eaves side engaging part is formed on the edge part so that the eaves side engaging parts can be engaged with each other, respectively, and the central face plate part. The back side is supported by each of the left and right face plate receiving and supporting portions, and the ridge-side engaging portion of the side-roofing roof plate member is locked to each press-fitting locking portion, and the center of the side-roofing roof plate member is located above the groove. It is characterized in that a side-roofing roof plate member is locked on the rafter member such that the end faces of the face plate portion are butted against each other.

The invention according to claim 2 is a construction method of a unit type thatched roof structure using the rafter member and the thatched roof plate member according to claim 1, wherein the rafter member is provided on each purlin material. Are arranged at a predetermined pitch, and the back side of the central face plate of the lower-side lateral thatched roof plate member is supported by the left and right face plate receiving portions, and the lower-side lateral thatched roof plate member is supported by each press-fitting locking portion. The ridge-side engaging portion of the rafter member is locked, and then the end faces of the central face plate portions of the lower tier side thatched roof plate members are butted against each other at the groove upper portion of the rafter member, and further, the eaves side engagement of the upper tier side thatched roof plate. The joining portion is engaged with the ridge-side engaging portion.

[Action]

In the unit type thatched roof structure of the invention according to claim 1, instead of the hanger member, each press-fitting locking portion projecting to the upper part of each of the left and right step surfaces is provided, and each press-fitting locking portion has a lateral thatched roof plate member. Since it has a structure that locks the ridge-side engaging portion, it is possible to accurately position the side thatched roof plate member at the set predetermined pitching pitch interval without preparing a suspension member as a separate member. In addition, the lateral thatched roof plate member can be securely locked to the rafter member.

Also, leaving the left and right step surfaces and the press-fitting locking portions projecting above the step surfaces, the side portions are bent inward or outward, and the left and right face plate support portions are respectively stepped or sawtoothed. Since it is a rafter member formed in a shape, the back surface side of the central face plate portion of the thatched roof plate member can be supported by each of the left and right face plate receiving and supporting portions, and it is sufficient from the back surface side by each face plate receiving and supporting portion. Since it is reinforced and supported, it is possible to favorably eliminate the bending of the central face plate portion due to external pressure.

Moreover, it is possible to provide an inexpensive and thatched roof structure that is structurally very simple and easy.

On the other hand, in the construction method for a unit type thatched roof structure of the invention according to claim 2, on the other hand, the springback of the ridge side engagement portion of the lower side thatched roof plate is provided at each press-fitting locking portion projecting above the left and right step end faces. By using an extremely simple work operation of press-fitting by utilizing, the side-roofing roof plate member can be automatically and securely locked to the rafter member.

Therefore, in the state in which the side-roofing roof boards are raised, each of the side-roofing roof boards is accurately maintained at the set predetermined roofing pitch interval, and no skill is required.

Furthermore, in the unit type thatched roof structure constructed according to the invention of claim 1 or the invention of claim 2, rainwater or the like entering from the abutting portion of the thatched roof plate member flows down in the groove of the rafter member. Drained.

〔Example〕

Hereinafter, an embodiment of a unit type thatched roof structure according to the present invention will be described in detail with reference to FIG. 1 to FIG.

FIG. 1 is a perspective view and an overall conceptual view showing a rafter member, which is a constituent member of a unit type thatched roof structure according to this embodiment, and FIG. 2 is an outline of a unit type thatched roof structure according to this embodiment. FIG. 3 is a vertical sectional side view showing the configuration, and FIG. 3 is a transverse front view of the same.

Similarly, FIG. 4 and FIG. 5 are perspective views respectively showing the roofing roof board member and the suspension member in the same manner, and FIGS. 6 (a), (b), (c) and (d) are respectively, Sectional drawing which shows the other specific example of an edge bending part, FIG. 7 is a partial perspective view which shows another example of the same rafter member, and FIG. 8 is the unit type side-roof structure which was raised as above. 9 (a) to 9 (d) are partial cross-sectional views each showing a different mounting state of the rafter members to the main material in the unit type horizontal roof structure.

In other words, in the configurations of FIGS. 1 to 5, the unit type roof structure of this embodiment has a structure in which a metal steel plate is press-formed or roll-formed, or a combination thereof, or after extrusion molding as appropriate. Each component formed into a predetermined shape by press molding or the like, that is, each component arranged to give a predetermined roof gradient parallel to the ridge direction of the hut assembly forming the roof structure surface, that is, parallel to the horizontal direction. On the purlin material (A), it is orthogonal to the ridge direction,
The rafter members (11) made of thick metal steel plates fixedly arranged in parallel in the longitudinal direction at a predetermined pitch interval and directly supported on each of these rafter members (11), and from the lower eaves to the upper eaves side. The roofing roof board members (31) made of a slightly thin metal steel plate that can be raised up to the eaves side at predetermined pitch intervals, and each of these roofing roof board members (31) for each roofing position. The suspension member (51) is also made of a thick metal steel plate and is retained and locked individually on the rafter member (11).

As shown in FIG. 3, the rafter member (11) has a bottom portion (12) and left and right side portions (13) and (14) which are raised on both sides and has a cross section. The groove is formed in a substantially U-shaped upper opening, and is located above each of the side portions (13) and (14) and corresponds to the pitching pitch of the roofing roof plate members (31). Steps (15) and (16) on the left and right are stepped on the eaves-side step h corresponding to the engaging step between the roofing roof board members (11) at each roof board engaging point (11A). -Shaped or saw-tooth-shaped left and right face plate receiving and supporting portions (17), (18) are formed by being bent inward facing each other, and rainwater, etc., flow down inside the groove. It forms a space (19).

Further, as shown in FIG. 4, the lateral thatched roof plate member (31) is in the longitudinal transverse direction which is parallel to the ridge direction in the roofing state, and the rafter member (11) is provided. Has an effective length 1 (p) that is the same as or an integer multiple of the arrangement pitch interval p.

Further, in the short lengthwise direction which is orthogonal to the ridge direction in the roofing state, the center face plate part (32) having an effective width w matching the roofing pitch interval is left, and the ridge is formed on one side edge. The side engaging portion (33) and the eaves side engaging portion (34) are respectively formed on the other side edge portions, and at both ends in the longitudinal and lateral directions thereof, the ridge side engaging portions between adjacent ones. The edge bending portions (39), (40) are bent downward by means such as bending so as not to hinder the work for engaging the eaves side engaging portion (34) with the (33). Is formed so that rainwater and the like can be prevented from entering from the abutting end surfaces into the insides of the ridge side engaging portion (33) and the eaves side engaging portion (34) as much as possible.

The edge bent portions (39) and (40) have various shapes as shown in FIGS. 6 (a), (b), (c) and (d) in addition to FIG. Is considered, and the edge bending part (39),
An elastic material such as rubber or resin may be arranged on the abutting end faces of the (40) for waterproofing and expansion / contraction.

Here, with respect to the ridge-side engaging portions (33) and the eaves-side engaging portions (34) on both sides in the lateral direction of the horizontal roofing roof plate member (31), each horizontal roofing roof plate member (31) when the roof is raised. 2) are adjacent to each other and can be engaged with each other by a predetermined engagement step, and in this case, the engagement configuration is not particularly limited.

As an example of a specific engagement structure, regarding the former ridge-side engagement portion (33), the end-folded engagement portion (35) folded back inward for engagement and the end-folded engagement member. Joint part (3
The upper retaining portion (36) bulging upward from 5) is formed, and notches (33a) and (33b) are formed so that a part of both ends thereof does not hinder the engagement. .

Further, the latter eaves side engaging portion (34) is bent downward to include the front edge hanging portion (37) capable of including the upper retaining portion (36) therein, and the front edge hanging portion (37). An end engaging edge portion having an upward bulging portion (38a) in a part which is bent inward from the hanging portion (37) so as to be insertably engageable with the end folding portion (35) ( 38) and are formed.

Further, as shown in FIG. 5, each of the suspension members (51) has a step surface (15) in the rafter member (31).
Left and right face plate support parts (17), which are close to the base of (16),
(18) A mounting board part (52) that is mounted between the mounting screws (B) and the like, and the roofing member (31) that has the horizontal roof.
The ridge-side engaging part (33) of the ridge side has a clenching part (53) for clenching and retaining the upper retaining part (36).

9 (a) to 9 (d) show several examples of how the rafter members (11) are attached and fixed to the respective purlin members (A) provided with the predetermined roof gradient.

FIG. 9 (a) shows the left and right sides (1) of the rafter member (11).
3) and (14) are provided with mounting holes (22) and (23) respectively, and the means for mounting with the respective fixing metal fittings (71) and (71) fixed on the main building material (A) are shown. There is.

FIG. 9 (b) shows that the mounting flanges (24) and (25) are formed by folding back at the lower portions of the side parts (13) and (14), respectively, and are fixed on the purlin material (A). Each fixing bracket (7
2) and (72) show the means of attachment.

In FIG. 9 (c), a protrusion (26) is provided at the center of the bottom (12) of the rafter member (11) so as to project upward, and a mounting screw or a screw is passed through the protrusion (26). The means for mounting is shown by the vault (73).

FIG. 9 (d) shows a projecting ridge (27) having an inverted dovetail-shaped lower surface formed at the center of the bottom (12) so as to protrude upward.
The means for mounting by means of the mounting vault nut (74) having the head of the corresponding shape is shown, utilizing the inside of the inverted dovetail-shaped recess of the ridge (27). According to each of these mounting means, it is possible to mount the rafter member (11) without impeding the flow of rainwater or the like flowing down inside the groove and preventing the water leakage to the purlin (A) side.

Therefore, in the configuration of each member according to the above embodiment,
As shown in FIGS. 1 and 2, each purlin material (A)
The individual rafter members (11), (11) on the upper side are arranged and fixed to the rafter members (11), (11) at a predetermined pitch interval p. In this state, first, the rafter members adjacent to each other ( 1
1), left and right face plate support parts (17) on the lower side,
The lower side thatched roof plate member (31) is supported while passing through (18) and straddling the longitudinal center portions thereof.

Then, in this state, the step surfaces (15) and (16) of the rafter members (11) and (11) adjacent to each other are provided.
The left and right face plate receiving and supporting portions (17) and (18) which are close to the base of the suspension member (51) are mounted on the mounting substrate portion (5).
2) is attached to each of them with fastening screws (B), (B), etc., and the upper pulling of the ridge side engaging part (33) of the lower step side thatched roof plate member (31) which is supported and supported. Fastening part (3
6) bite and hold by the holding bite part (53).

Furthermore, with respect to the lower that side roofing roof plate member (31), the horizontal thatching roof plate member (31) at the same stage in the longitudinal and lateral directions thereof.
At each end edge bent portion (39) at the end of the central face plate portion (32),
(40) are connected so that they face each other, and sequentially,
Lock and lock in exactly the same way.

That is, in this case, each of the thatched roof plate members (31) connected in the same step by one suspension member (51),
The adjacent parts of (31) will be simultaneously locked and locked.

It should be noted that it is not impeded that, for example, a joiner or a cover is applied to the butt connection portion at the same stage, if necessary.

Next, this time, the end engaging edge portions (38) of the eaves side engaging portions (34) in the horizontal roofing roof plate member (31) on the upper tier side are connected to the rafter members (11), ( 11) Engage by inserting it into the end folded engagement part (35) of the ridge side engagement part (33) of the lower side thatched roof roof plate member (31) that is supported and supported above .

In this case as well, the horizontal roofing roof plate member (31) on the upper side is the same rafter members (11) adjacent to each other, and the left and right face plate support parts (17), (18) on the upper side of the rafter member (11). Through, and
The upper thatched roof plate member (31) is supported while being straddled between the central portions in the longitudinal direction, and is similarly retained and locked by the hanging member (51).

In the case of such a roofing state, as shown in FIG. 8, the longitudinal and lateral connecting portions of the horizontal and thatched roof plate members (31) and (31) at the upper and lower stages respectively. The abutting surfaces between the edge hanging parts (39) and (40) appearing in line on the corresponding rafter members (11) in series, that is, each individual thatched roof plate member (31). ), Each of which is arranged in the shape of a square (mosaic) when viewed from the surface side.

That is, the desired thatched roof structure can be raised in this way, and in this raised state, both of the upper and lower horizontal thatched roof plate members (31) have their respective central face plate portions. (32) is supported by the left and right face plate support portions (17), (18) of the rafter members (11), (11) and is reinforced and supported from the back side, so that the central face plate portion is The bending of the (32) due to the external pressure can be effectively eliminated.

At the same time, with respect to each of the roofing roof plate members (31) and (31) connected in the same direction in the longitudinal and lateral directions, the edge bent portions (in the central face plate portions (32) and (32) ( Since 39) and (40) are butted against each other at the central portion in the longitudinal direction of the rafter member (11), rainwater and the like that enter from the butted surfaces of these edge bent portions (39) and (40) , Each edge bending part (3
9), (40) mutually engaged ridge side engaging part (33)
By folding down the end faces of the eaves-side engaging portion (34), there is no fear of intruding into the engaging portions (33), (34), and the rafter member (1
It can flow down to the trough space (19) in the groove in 1) and be discharged to the outside through the groove.

It should be noted that the mating portion of the edge bent portions (39) and (40) and the front edge hanging portion (37) can be appropriately treated by welding or sealing to prevent rainwater from entering, and It is preferable because it can accommodate heat expansion and contraction of the roof plate and the like.

Further, in the above embodiment, the side thatched roof plate member (3
In order to hold the ridge side engaging portion (33) in 1), a separate hanging member (51) is used. As shown in FIG. 7, the rafter member is used. In the upper side wall of each of the left and right step surfaces (15) and (16) in (11), the suspension member (5
Each suspension part (20), (21) provided with a press-fitting locking part that performs the same action as 1) can be formed and locked by using the springback of the ridge side engaging part (33). Therefore, it is advantageous that the work for locking by fitting or press fitting can be further facilitated, the material used can be reduced, and the manufacturing process can be simplified.

In the above embodiment, the left and right face plate receiving and supporting portions (17) and (18) of the rafter member (11) are both bent inward, but as shown in FIG. Both of them may be bent outward to obtain the same action and effect.

FIG. 11 and FIG. 12 are cross-sectional views of essential parts of a systemized rafter member according to the present invention fixed to a roof plate or the like having another shape. Of these, the one shown in FIG. 11 is one in which the ridge-side engaging portion (33) of the roof plate member (31) is folded back into a predetermined shape and overlapped with each other, and the end portions thereof are further covered with face plate support portions (17), (18). ) Is a contact surface (33b) that can be fixed with a fixing tool such as a screw (B).

Further, in the structure shown in FIG. 12, the ridge-side engaging portion (33) of the roof plate member (31) is folded back into a predetermined shape and overlapped with each other, and its end portion is further extended to the ridge side for contact. The surface (33b) is formed, and the rising portion (33c) is formed at the tip thereof. Moreover, a suspension (51) corresponding to the curved surface shape of the contact surface (33b) and the upright portion (33c) is formed, and the suspension (5
1) and face plate receiving parts (17), (1)
8) Fix on top. The shape of the suspender (51) is substantially hat-shaped as shown in the figure, and the top is formed so as to support the central face plate (32) of the roof plate member (31) from below.

The same parts as those shown in the embodiment of FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.

〔The invention's effect〕

In the unit type thatched roof structure of the invention according to claim 1, instead of the hanger member, each press-fitting locking portion projecting to the upper part of each of the left and right step surfaces is provided, and each press-fitting locking portion has a lateral thatched roof plate member. Since it has a structure that locks the ridge-side engaging portion, it is possible to accurately position the side thatched roof plate member at the set predetermined pitching pitch interval without preparing a suspension member as a separate member. In addition, the lateral thatched roof plate member can be securely locked to the rafter member.

Also, leaving the left and right step surfaces and the press-fitting locking portions projecting above the step surfaces, the side portions are bent inward or outward, and the left and right face plate support portions are respectively stepped or sawtoothed. Since it is a rafter member formed in a shape, the back surface side of the central face plate portion of the thatched roof plate member can be supported by each of the left and right face plate receiving and supporting portions, and it is sufficient from the back surface side by each face plate receiving and supporting portion. Since it is reinforced and supported, it is possible to favorably eliminate the bending of the central face plate portion due to external pressure.

Moreover, it is possible to provide an inexpensive and thatched roof structure that is structurally very simple and easy.

On the other hand, in the construction method for a unit type thatched roof structure of the invention according to claim 2, on the other hand, the springback of the ridge side engagement portion of the lower side thatched roof plate is provided at each press-fitting locking portion projecting above the left and right step end faces. By using an extremely simple work operation of press-fitting by utilizing, the side-roofing roof plate member can be automatically and securely locked to the rafter member.

Therefore, in the state in which the side-roofing roof boards are raised, each of the side-roofing roof boards is accurately maintained at the set predetermined roofing pitch interval, and no skill is required.

Furthermore, in the unit type thatched roof structure constructed according to the invention of claim 1 or the invention of claim 2, rainwater or the like entering from the abutting portion of the thatched roof plate member flows down in the groove of the rafter member. Drained.

[Brief description of drawings]

FIG. 1 is a perspective view and an overall conceptual view showing a rafter member which is a constituent member of a unit type thatched roof structure according to this embodiment, and FIG. 2 is an outline of a unit type thatched roof structure according to this embodiment. Fig. 3 is a vertical sectional side view showing the structure, Fig. 3 is a transverse front view of the same as above, and Figs. 4 and 5 are perspective views showing the roofing roof plate member and the suspension member in the same manner, respectively. ), (B), (c), and (d) are cross-sectional views showing other specific examples of the edge bent portion, and FIG. 7 is a partial perspective view showing another example of the same rafter member, and FIG. Is a plan explanatory view showing a mode of a unit type thatched roof structure which is raised as above. FIGS. 9 (a) to 9 (d) are the respective attachments of rafter members to a main material in the unit type thatched roof structure as above. Partial cross-sectional view showing the state, Fig. 10 is a part showing a modification of the rafter member The perspective views, FIG. 11 and FIG. 12 are partial vertical cross-sectional views showing a roof structure using different roof plate members and the like. (11) …… Rafter members (11A) …… Roof plate engagement points (12) …… Bottom (13), (14) …… Left and right sides (15), (16) …… Left and right steps Surfaces (17), (18) …… Left and right face plate bearings (19) …… Gutter space h …… Eaves side step p …… Arrangement pitch interval (A) …… Main building materials (20), (21) ...... Suspension part (22), (23) ...... Mounting hole (24), (25) ...... Mounting flange part (26), (27) ...... Ridge part (31) ...... Side-roof roof plate member (32) …… Center face plate (33) …… Building side engaging part (33a) …… Notch part (33b) …… Abutting surface (33c) …… Upright part (34) …… Eave side engaging Part (35) …… End folded back engaging part (36) …… Upper retaining part (37) …… Front edge hanging part (38) …… End engaging edge (38a)… Swelling part ( 39), (40) …… End edge bent part 1 (p) …… Effective length w …… Roofing pitch interval (Effective width) (51) …… Suspension member 52) …… Mounting board part (53) …… Retaining bite part (71), (72) …… Fixing metal fittings (73), (74) …… Screws or vaults (A) …… Main building materials (B) ...... Stop screw

Claims (2)

(57) [Claims] 1. A groove having a bottom and left and right sides,
At each roof board engagement location corresponding to the pitching pitch of the upper part of each side, at each eave side step corresponding to the engagement step between the roof boards, each projecting to the left and right step surfaces and the upper part of each of these step surfaces. The side parts are bent inward or outward, leaving the press-fitting locking parts, and the left and right face plate support parts are formed in a staircase shape or a sawtooth shape, and are arranged at a predetermined pitch interval on each purlin material. A rafter member to be installed, and a central face plate portion having an effective length that is the same or an integer multiple of the arrangement pitch interval in the longitudinal and transverse directions, and that has an effective width that matches the roofing pitch interval in the lateral longitudinal direction. Remaining, the ridge-side engaging portion is provided on one side edge portion, and the eaves-side engaging portion is formed on the other side edge portion, respectively. The back side of the face plate part is supported by the left and right face plate support parts, and the ridge side of the roof plate member is laterally attached to each of the press-fitting locking parts. A unit characterized in that the joint part is locked and the end faces of the central face plate part of the horizontal roofing plate member are abutted at the upper part of the groove, and the horizontal roofing plate member is locked on the rafter member. Type thatched roof structure. 2. A construction method of a unit type thatched roof structure using the rafter member and the thatched roof plate member according to claim 1, wherein the rafter member is provided on each main board at a predetermined pitch interval. The left and right side plate support portions support the back side of the central face plate portion of the lower side side thatched roof plate member, and the ridge-side engaging portions of the lower side side thatched roof plate member in the respective press-fitting locking portions. Then, the end faces of the central face plate portion of the lower tier side roofing roof member are butted against each other at the groove upper portion of the rafter member, and the eaves side engaging portion of the upper tier side thatching roof plate is attached to the ridge side. A construction method for a unit type thatched roof structure, characterized by engaging with an engaging portion.