194 results about "Double wall" patented technology

The present invention relates to a double-walled steel cofferdam with no bottom and a construction method for deep-water rock capping platform rotary excavation. The BIM three-dimensional simulation technology is used to accurately design the size of the cofferdam module and the position of the preset holes, which greatly improves the accuracy and efficiency of the construction. By solving the problems of module size and layout in the design stage, the installation and commissioning work on site can be significantly reduced, thereby speeding up the construction progress and ensuring the quality of the project. The quick connection method of prestressed tendons and extruded waterproof strips is adopted between the cofferdam modules, which saves a lot of welding work, not only improves the construction efficiency but also reduces the construction difficulty. The guide device used for the lowering of the cofferdam is used for horizontal and vertical displacement and inclination monitoring, which can help the cofferdam lowering process more accurately, and greatly improve the construction efficiency and safety. The comprehensive slotting method of impact drill, rotary drilling drill and grab bucket greatly improves the slotting efficiency and reduces the slotting difficulty.

A combustor panel (200) is disclosed herein. The combustor panel (200) includes a top side, a bottom side opposite the top side, a feature (202) coupled to the top side and extending orthogonally away from the top side, the feature (202) defining a first space on the bottom side beneath the feature (202), a first plurality of cooling holes (204) extending in a first direction from the top side to the bottom side, a second plurality of cooling holes (206) extending in a second direction from the top side to the bottom side, the second direction being rotated about 1 ° to about 60° counter-clockwise from the first direction, and a third plurality of cooling holes (206) extending in a third direction from the top side to the bottom side, the third direction being about rotated 1° to about 60° clockwise from the first direction.

The utility model relates to a light-transmitting guide pipe structure of a light-transmitting concrete outer wall, which is used for being matched with construction of a non-contact double-layer outer wall and forming a light guide channel penetrating through the double-layer outer wall at the same time after the construction is completed. The light-transmitting guide pipe structure comprises a first sleeve, a second sleeve and a transparent light guide rod; one end of the first sleeve is connected to one end of the second sleeve in a sleeved mode, and a pipe cavity with the inner diameter decreasing from the first sleeve to the second sleeve is formed in the pipe. The length and the shape of the transparent light guide rod correspond to those of the tube cavity; the first sleeve and the second sleeve are sequentially matched with the double-layer wall body for construction and connection, while sequential construction of the double-layer wall body is not affected, a lateral light shielding channel is formed after the double-layer wall body is used, and then a light guide channel penetrating through the double-layer wall body at the same time is formed after the transparent light guide bar is inserted into the double-layer wall body; the limitation that a conventional light-transmitting rod can only be applied to a single-layer concrete wall is eliminated, and the application scene of the light-transmitting concrete wall is expanded.

The utility model belongs to a foundation vibration isolation structure suitable for being adjacent to a subway basement in the field of civil engineering, and adopts the technical scheme that the foundation vibration isolation structure comprises double bottom plates and an anti-vibration pad, the double bottom plates comprise an upper bottom plate and a lower bottom plate, and the anti-vibration pad is arranged between the upper bottom plate and the lower bottom plate; the basement outer wall and the enclosure wall form double walls, the basement outer wall is connected with the upper bottom plate, the enclosure wall is connected with the lower bottom plate, and the anti-vibration pad extends upwards to be laid between the basement outer wall and the enclosure wall; the pile head of the uplift pile is fixedly embedded in the lower bottom plate; a waterproof layer is arranged below the anti-vibration pad, and the waterproof layer is arranged between the double bottom plates and the double walls; after construction of the uplift piles and the enclosure wall is completed, a cushion layer, a lower bottom plate, a waterproof layer, an anti-vibration pad, an upper bottom plate and a basement outer wall are sequentially formed from bottom to top. While the anti-floating and waterproof requirements of the basement foundation slab are met, the problem of environmental vibration caused by subway operation is solved, the use space in a building is not affected, and meanwhile the construction cost and the construction difficulty are low.

The invention relates to the technical field of gas engines, and particularly discloses an anti-deformation and high-cooling-efficiency backflow combustion chamber large elbow, the sections of a first layer wall and a second layer wall of the large elbow are arc-shaped, the first layer wall is arranged outside the second layer wall, one end of the first layer wall and one end of the second layer wall are fixedly connected into a whole, and the other end of the first layer wall is arranged outside the second layer wall. The other end of the first layer wall and the other end of the second layer wall are clamped, a space capable of moving relative to each other is formed in the clamping position, a plurality of annular grooves facing the second layer wall are formed in the first layer wall, the annular grooves are attached to the side, facing the first layer wall, of the second layer wall, and a cavity between the first layer wall and the second layer wall is divided into a plurality of impact diffusion cavities through the annular grooves. According to the invention, the gap between the double walls is not changed, the problem of deformation caused by stress due to inconsistent swell capacity of the double walls is prevented, the cooling protection effect of the inner wall is enhanced, cracks caused by too high temperature of the large elbow are prevented, the overall stress is small, cracks are not easy to appear at welding joints, tight connection is realized, and air leakage is not easy.

The present invention relates to a method for air-drying solid, plasticizable material for use in a device for producing a three-dimensional object by means of additive manufacturing with material preparation, and to a corresponding device for producing the three-dimensional object from solid, plasticizable material with at least one additive manufacturing unit. A heated gaseous substance is introduced via a cavity (10) of a double-walled material feed nozzle (5) arranged between a material reservoir (2) for the solid material and a material feed zone (7) of a plasticizing unit (1) for plasticizing the solid material.The heated gaseous substance then emerges from the cavity (10) of the double wall (8, 9) of the material feed nozzle (5) near the material feed zone (7) and rises through the material feed nozzle (5) to the material reservoir (2), flowing around the solid material.

A method of manufacturing a heat exchanger tube is disclosed. The method may include folding a single sheet of material onto itself to form a folded sheet of material and forming first and second pluralities of ridges on a first portion of the folded sheet and a second portion of the folded sheet. The method may further include folding the first portion about a first portion distal end to overlay on a third portion of the folded sheet, and the second portion about a second portion proximal end to overlay on a fourth portion of the folded sheet. Furthermore, the method may include folding the third inner portion about a third portion distal end to overlay on a fifth portion of the folded sheet and folding the fourth portion about a fourth portion proximal end to overlay on the fifth portion to form the heat exchanger tube.

The invention belongs to the technical field of pipe galleries, and particularly relates to an assembly type pipe gallery foundation pit structure and production equipment thereof. The pipe gallery comprises a pipe gallery body, the pipe gallery body comprises two vertical double-layer wall bodies and two horizontal double-layer wall bodies, the two vertical double-layer wall bodies are symmetrically arranged left and right, the two horizontal double-layer wall bodies are symmetrically arranged up and down in parallel, and containing grooves are formed in the side faces, facing the horizontal double-layer wall bodies, of the vertical double-layer wall bodies; connecting steel bars are arranged at the positions, corresponding to the containing grooves, of the horizontal double-layer wall body, and the containing grooves are filled with cement. According to the fabricated pipe gallery foundation pit structure, the two vertical double-layer wall bodies and the two horizontal double-layer wall bodies are separated for transportation, so that the two vertical double-layer wall bodies and the two horizontal double-layer wall bodies can be stacked on a transport vehicle, transportation is convenient, space is not occupied, construction time is not wasted on transportation, auxiliary splicing is achieved through an assembly vehicle, and efficiency is improved.

The utility model relates to the field of building construction engineering, in particular to a double-wall double-column structure of a basement civil air defense part. According to the technical scheme, a partition plate is included; the wall ribs are arranged on the two sides of the partition plate; the column ribs are arranged on the two sides of the partition plate; the transverse steel bars penetrate through the partition plate, and the transverse steel bars are fixedly connected with the corresponding column bars and the corresponding wall bars; the wall bodies are formed on the two sides of the partition plate in a pouring mode and are used for burying and fixing the corresponding wall reinforcements; the column bodies are formed on the two sides of the partition plate in a pouring mode, the corresponding column ribs are embedded and fixed, and the column bodies are connected with the corresponding ends of the wall body. The construction method has the beneficial effects that by arranging the partition plate, the partition plate is reserved in the pouring position after pouring is completed, and therefore the difficulty in dismantling is avoided.

The invention relates to an anti-penetration boxboard assembly type double-layer wall body structure and a construction method, the double-layer wall body structure comprises an outer layer wall body, the outer layer wall body comprises a plane straight steel plate, T-shaped stiffening ribs and prestressed steel strands, the multiple T-shaped stiffening ribs are evenly arranged on the inner side of the plane straight steel plate, webs of the T-shaped stiffening ribs are vertically welded and fixed to the plane straight steel plate, and the prestressed steel strands are arranged on the outer layer wall body; a cavity is formed between every two adjacent T-shaped stiffening ribs, and the prestressed steel strands are symmetrically arranged on the two sides, close to the plane straight steel plate, of webs of the T-shaped stiffening ribs. The inner-layer wall body is a corrugated steel plate and is arranged opposite to the outer-layer wall body, corrugations of the inner-layer wall body extend outwards in the oblique line direction forming a preset angle with the height direction of the outer-layer wall body, wave crests of the corrugated steel plate are tightly attached to flange plates of the T-shaped stiffening ribs, and connecting holes are correspondingly formed in the wave crests of the corrugated steel plate; the anti-penetration structural layers are arranged in the cavities and detachably connected with the adjacent T-shaped stiffening ribs; and the connecting devices are mounted on the flange plates of the T-shaped stiffening ribs and suitable for penetrating through the connecting holes to fix the inner-layer wall body and the outer-layer wall body. The double-layer wall body structure has better anti-penetration capability, and can exert enough safety performance in scenes such as wartime and the like.

The invention relates to the technical field of machining processes, in particular to a machining method for a high-precision large-diameter fluoroplastic sealing thin-wall workpiece, which aims at machining the fluoroplastic sealing thin-wall workpiece with the diameter of more than phi 200mm and the wall thickness of 0.2-0.7 mm, and comprises the following steps of: 1, blanking to form a fluoroplastic tubular blank; 2, a special tool is customized; 3, the fluoroplastic tubular blank is fixed to a spindle of a numerical control lathe; 4, a numerical control turning tool is configured, and a numerical control turning program is compiled; 5, an inner hole or an outer circle of the fluoroplastic sealing thin-wall workpiece, a matched molded surface and a sealing surface of the fluoroplastic sealing thin-wall workpiece and the O-shaped rubber ring are machined, and finish turning allowance is reserved according to the double wall thickness priority principle; 6, finish turning is conducted on the inner hole or the outer circle in the fluoroplastic sealing thin-wall workpiece and the matched profile of the O-shaped rubber ring; 7, the sealing face of the fluoroplastic sealing thin-wall workpiece is subjected to finish turning, and the wall thickness is guaranteed; and 8, the workpiece is cut off through a cut-off tool by means of a surface constant-speed and small-feed-rate turning method.

The invention belongs to the technical field of double-wall corrugated pipes, and particularly relates to double-wall corrugated plastic pipe forming equipment and a connecting method.The double-wall corrugated plastic pipe forming equipment comprises a double-layer extrusion assembly, a first shaping assembly and a second shaping assembly; the double-layer extrusion assembly is used for continuously and synchronously extruding an inner-layer pipe and an outer-layer pipe of the double-wall corrugated pipe and blowing normal-temperature air between the inner-layer pipe and the outer-layer pipe, the first shaping assembly is used for shaping the corrugated outer-layer pipe, and the second shaping assembly is used for supporting the moving inner-layer pipe and the moving outer-layer pipe from the inner-layer pipe and shaping the inner-layer pipe. The pressing die assemblies in the two first shaping assemblies located on the two sides of the shaping cylinder are concentrated on the pressure applying side of the double-wall corrugated pipe, and after the pressing die assemblies apply pressure to the double-wall corrugated pipe, the pressing die assemblies automatically slide to the pressure applying initial end position on the guide base and are driven by the supporting assembly to supplement the pressing die assemblies on the pressure applying side of the double-wall corrugated pipe. The number of pressing die assemblies is effectively reduced, and the equipment cost is effectively reduced.

The invention relates to an anti-penetration box-plate assembled double-layer wall structure and a construction method. The double-layer wall structure comprises: an outer wall, comprising a flat straight steel plate, a T-shaped stiffening rib and a prestressed steel strand, wherein a plurality of T-shaped stiffening ribs are evenly arranged on the inner side of the flat straight steel plate, and the web of the T-shaped stiffening ribs is vertically welded and fixed to the flat straight steel plate, a cavity is formed between two adjacent T-shaped stiffening ribs, and the prestressed steel strands are symmetrically arranged on both sides of the web of the T-shaped stiffening ribs close to the flat straight steel plate; an inner wall, which is a corrugated steel plate, arranged opposite to the outer wall, and wherein the corrugations extend outward along an oblique line direction at a predetermined angle to the height direction of the outer wall, and the wave crests of the corrugated steel plate are in close contact with the flange plates of the T-shaped stiffening ribs, and correspondingly provided with connecting holes; an anti-penetration structural layer, which is arranged in each cavity and detachably connected to the adjacent T-shaped stiffening ribs; a connecting device, which is installed on the flange plates of the T-shaped stiffening ribs and is suitable for fixing the inner and outer walls through the connecting holes. The double-layer wall structure of the present invention has excellent anti-penetration capability and can provide sufficient safety performance in wartime and other scenarios.

The invention discloses an internal combustion type carbonization system based on material whole-course spiral propulsion, which comprises a carbonization furnace, a feeding auger, an ignition device, a first air blower and a second air blower, the carbonization furnace linearly extends along the left-right direction, and the right end of the carbonization furnace is provided with a carbon discharge port; a drying preheating area, a main carbonization spontaneous combustion area and a burnout carbon discharge area are sequentially formed in the hearth in the advancing direction of materials; through the partition design in the hearth and the whole-course penetrating layout of the feeding auger feeding pipe, materials are turned over, fed and carbonized in the pipe at the same time, and the problems of uneven carbonization and product quality fluctuation caused by static material accumulation or simple pushing of traditional external combustion type equipment are thoroughly solved; meanwhile, due to the internal combustion type design, pyrolysis gas can be spontaneously combusted in the furnace, heat directly acts on a feeding pipe and materials, heat loss caused by external combustion type double wall surface conduction is avoided, the heat utilization rate can be greatly improved, system self-circulation can be achieved under the condition that external continuous energy supply is not needed, and the operation cost is reduced.

To stably fix a divided cover member of a faucet cover.SOLUTION: A faucet cover 10 includes a main cover 48 having an opening 47 at a fitting position P of a faucet handle 16 and covering a faucet body 2, and a collar 56 attached to the opening 47 of the main cover 48. Since the main cover 48 includes a first wall part 71 constituting an outer shell 70 of the main cover 48 and a second wall part 72 facing the first wall part 71, the first wall part 71 and the second wall part 72 form a double wall 45. The collar 56 includes an insertion fitting part 73 to a gap β of the double wall 45 directed in an opening direction of the opening 47 of the main cover 48.SELECTED DRAWING: Figure 7

An acoustic window including a convex surface that extends in an azimuth direction and contacts an examination target, and a first wall portion and a second wall portion that extend divergently from each other. At least a portion of the first wall portion is provided along an inner surface of the probe case, and the second wall portion has an outer surface that is contiguous with the convex surface.

A fluid assembly comprising: a first conduit extending in an axial direction and configured to carry a fluid, a double walled outer second conduit extending in the axial direction; the second conduit having an inner wall and outer wall and a first interspace between the inner and outer walls, wherein the first conduit is housed inside the second conduit to form a second interspace between the first conduit and the inner wall of the second conduit.

The utility model relates to a device (1) for attaching a movable element to a double wall consisting of a first wall (2) and a second wall (3), comprising: an attachment head (4) applied against and positioned so as to protrude from a front face (21) of the first wall (2), the head (4) extending in a longitudinal direction (X) by means of fastening means (5), the fastening device has a flexible clip (50, 50 ') passing through the two walls (2, 3) in the longitudinal direction (X); a locking pin (6) inserted through the attachment head (4), also through the two walls (2, 3), and positioned between the at least two flexible clips (50, 50 ') while the at least two flexible clips (50, 50') are removed in order to simultaneously fix the at least two flexible clips to the first wall (2) and the second wall (3), characterized in that the flexible clips (50, 50 ') are attached to the first wall (2) and the second wall (3). 50 ') comprises a first shape portion (54) engageable in abutment with a rear face (22) of the first wall (2) in order to push the attachment head (4) against the first wall (2), and a second shape portion (55) and a third shape portion (56) engageable in abutment with a front face (31) and a rear face (32) of the second wall (3) in order to push the attachment head (4) against the first wall (2), respectively, in order to push the attachment head (4) against the second wall (3). The first shape portion (54), the second shape portion (55), and the third shape portion (56) are arranged to maintain a predetermined space (IN) between the first wall (2) and the second wall (3).

The present invention provides a bracket member for a lighting fixture for a vehicle, the bracket accommodating and securing at least a portion of a lamp unit that emits light forward and having a peripheral wall surface that opens in the front-rear direction and extends in the front-rear direction to partition the housing space of the lamp unit, wherein at least a portion of the peripheral wall surface serves as a double wall, and there is a partition wall that partitions the double wall and defines a small space that is sandwiched by the double wall and extends in the front-rear direction. Since a front wall and a back wall are not provided, the weight can be reduced correspondingly, and rigidity can be secured by the double wall and the partition wall inside the double wall.

The invention provides a muddy water type pipe-jacking tunneling device adopting a double-channel cutterhead main shaft structure, which comprises a tunneling device shell, a main shaft seat, a cutterhead and a cutterhead main shaft, the tunneling device shell is of a cylindrical structure, the outer edge of the tail end of the tunneling device shell is provided with a bell and spigot for a bell and spigot pipeline, the main shaft seat is arranged at the rear half section of the tunneling device shell, and the cutterhead main shaft is arranged on the main shaft seat. The front half section of the tunneling device shell is a muddy water cabin; the cutter head is arranged at the front end of the tunneling device shell; the rear end of the cutterhead main shaft is arranged on the main shaft seat, and the front end is connected with the cutterhead; a plurality of hard alloy cutter blocks are arranged on the soil facing surface of the cutter head; the cutterhead main shaft adopts a large-diameter double-wall structure and consists of an outer shaft and a core tube, and the front end of the outer shaft is connected with the cutterhead and is responsible for driving the cutterhead to rotate; the front end of the core tube is closed, the core tube is fixedly arranged at the axis of the outer shaft, and the inner space of the outer shaft is divided into a core tube hole and a double-wall interlayer channel between the outer wall of the core tube and the inner wall of the outer shaft; the structure is extremely simple, and the technical risk is greatly reduced.

The application discloses a supporting device for double-layer wall construction, which comprises a supporting frame body, upper supporting pieces and a plurality of sets of connecting assemblies arranged on the supporting frame body, the double-layer wall comprises an inclined wall and an upper wall arranged above the inclined wall, and the plurality of sets of connecting assemblies are used for connecting the inclined wall formwork to the supporting frame body; the connecting assembly comprises a connecting rod, a lower supporting plate and an upper supporting plate, the connecting rod is vertically arranged and fixedly connected to the supporting frame body after penetrating through a lower formwork of the inclined wall downwards; the lower supporting plate is fixedly connected to the lower part of the connecting rod and used for supporting the lower formwork of the inclined wall; the upper supporting plate is fixedly connected to the upper part of the connecting rod and used for supporting an upper formwork of the inclined wall; the connecting rod is fixedly connected to the upper supporting piece after penetrating through the upper formwork of the inclined wall upwards, and the upper supporting piece is used for supporting the upper wall formwork; the supporting device has good integrity and stable structure, and can simplify the installation of the formwork; and a double-layer wall construction method is also disclosed, which greatly improves the construction efficiency.

Partition (1) with a double wall (2, 3) that is partially translucent or transparent, forming a passage (4) for ventilation and sound attenuation. A privacy space, for example within a passenger railway carriage, delimited by such a partition. Figure for the abbreviation: Fig. 3

This invention provides a modular abrasive particle size classification and screening device, belonging to the technical field of screening equipment. It includes a mounting base, an integrated cylindrical body, and multiple independent screening modules. The integrated cylindrical body is mounted on the mounting base, and the multiple independent screening modules are arranged vertically from top to bottom along the interior of the integrated cylindrical body. Each independent screening module includes a screen frame and a screen mesh, and the screen mesh aperture of each module gradually decreases from top to bottom to achieve particle size classification and screening of the abrasive. The outer ring of the screen frame has a double-wall structure, forming a closed annular cavity between the double walls. Multiple guide sleeves are vertically arranged inside the annular cavity, and each guide sleeve contains a cleaning ball that can reciprocate vertically within the guide sleeve. This device, through the integrated cylindrical body and independent screening modules, utilizes the gradual change in screen mesh aperture and vibration to classify the abrasive. The cleaning balls impact elastic impact plates to vibrate the screen, preventing clogging.

The present invention describes a modular system for building wooden interior walls (1), derivatives thereof, composites and other materials from which it is possible to obtain the constructive elements that make up the present system. The developed modular system allows the easy assembly of interior walls (1), for the division of spaces or for the creation of double walls inside the original construction. They can be built by inexperienced users with a reduced number of tools. Its dismantling does not damage its elements and allows it to be reused.

A leak and outgassing inspection system according to an embodiment of the present invention comprises: a vacuum transmitter configured to measure the pressure of an insulation space of a double wall of a liquefied gas storage tank; a vacuum pump mounted on a vacuum pipe connected to the insulation space of the double wall of the liquefied gas storage tank, and configured to operate when the pressure of the insulation space measured by the vacuum transmitter rises above a set pressure; and a determination unit analyzing a component of gas sampled during operation of the vacuum pump, and determining whether a cause of an increase in the pressure of the insulation space is any one of a leak or outgassing of the double wall on the basis of an analysis result.

A double wall (2) for a combustion chamber (1) of a gas turbine of an aircraft, the double wall (2) comprising an inner wall (21) configured to be in contact with a combustion reaction and an outer wall (22) kept at a distance from the inner wall (21), the outer wall comprising a plurality of openings (3) so as to allow the circulation of a cooling flow (F) outside the outer wall (22) so as to cool the inner wall (21), the inner wall (21) being free of perforations so as to prevent the circulation of the cooling flow (F) towards the center of the combustion chamber (1). The double wall (2) is characterized in that the inner wall (21) comprises a plurality of members (4) projecting towards the outer wall (22), each projecting member (4) comprising a foot (4a) and a cylindrical head (4b) having a circular cross section, the head (4b) extending into the opening (3) having a circular cross section so as to define an adjusted cross section area between the projecting member (4) and the opening (3), the cooling flow (F) being able to flow through the adjusted cross section area.

The present application belongs to the technical field of sound insulation of fabricated buildings, and specifically relates to a structure and method for improving the air sound insulation performance of a lightweight wall for a fabricated building, and specifically comprises: adding an elastic damping cushion layer, a sound insulation damping rubber layer or a metal damping keel on both sides of a lightweight wall framework; applying double-layer wall panels; filling glass wool or rock wool inside; treating the butt joint of the wall panels; applying a window with a sound insulation amount greater than 75% of the sound insulation amount of the wall; and setting an elastic damping rubber cushion layer around the window. The air sound insulation performance of the wall is tested and the sound insulation grade is evaluated. By not changing the conventional structure of the lightweight wall framework, the air sound insulation performance of the conventional lightweight wall is improved in the full frequency band, and measures for improving the sound insulation performance of the wall containing the window are proposed in view of the conventional window in the wall as a whole sound insulation short board. The present application ensures the advantages of high assembly efficiency, convenient and fast prefabrication, simple construction and low cost of the lightweight wall, and significantly improves the air sound insulation performance of the lightweight wall.

The present invention discloses a connection structure and construction method for precast double beams and precast double walls in a concrete modular building, including two juxtaposed precast beams, precast partition walls and composite slabs of adjacent module units. The precast part of the precast beam and the composite slab of each module unit are integrally prefabricated and formed, and the precast beam and the precast partition wall are connected by a semi-flexible connection structure. There is a joint between the two precast beams and the precast partition wall, and a waterproof rubber strip for sealing the joint is provided in the joint of the two precast beams. The cast-in-place layer of the composite slab and the beam-slab joint area are cast in place at the site at one time. In the present invention, the precast part of the precast beam and the composite slab are integrally prefabricated and formed, and the cast-in-place layer of the composite slab and the beam-slab joint area are jointly cast with concrete, so that two adjacent precast beams are combined into one beam, enabling good connection performance between two adjacent module units, ensuring the mechanical performance of the overall structure. At the same time, the precast beam and the precast partition wall are connected by a semi-flexible connection structure, which has good connection performance and improves the seismic performance.

To provide a bracket member of a vehicle lamp fitting which is light-weight and has sufficient rigidity.SOLUTION: A bracket member of a vehicle lamp fitting is a bracket which houses and fixes at least part of a lamp unit configured to radiate light forward and has a peripheral wall surface which is open in an anteroposterior direction, extends in the anteroposterior direction, and defines a housing space of the lamp unit. At least a part of the peripheral wall surface forms a double wall. The bracket member further has partition walls partitioning the double wall and defining small spaces which are sandwiched by the double wall and extend in the anteroposterior direction. The bracket member does not have a front wall and a back wall and thus enables reduction of the weight. Further, the bracket member can secure rigidity by the double wall and the partition walls located at the inner side of the double wall.SELECTED DRAWING: Figure 2